HEALTHEON CORP
S-1/A, 1998-10-16
COMPUTER PROCESSING & DATA PREPARATION
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<PAGE>
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 16, 1998
    
 
                                                      REGISTRATION NO. 333-60427
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              -------------------
 
   
                                AMENDMENT NO. 4
                                       TO
                                    FORM S-1
    
 
                             REGISTRATION STATEMENT
 
                                     UNDER
 
                           THE SECURITIES ACT OF 1933
                              -------------------
 
                             HEALTHEON CORPORATION
             (Exact name of Registrant as specified in its charter)
 
<TABLE>
<S>                                   <C>                                   <C>
              DELAWARE                                7374                               94-3236644
  (State or other jurisdiction of         (Primary Standard Industrial                (I.R.S. Employer
   incorporation or organization)         Classification Code Number)              Identification Number)
</TABLE>
 
                            4600 PATRICK HENRY DRIVE
                             SANTA CLARA, CA 95054
                                 (408) 876-5000
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                              -------------------
 
                                W. MICHAEL LONG
                            CHIEF EXECUTIVE OFFICER
                             HEALTHEON CORPORATION
                            4600 PATRICK HENRY DRIVE
                             SANTA CLARA, CA 95054
                                 (408) 876-5000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                              -------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                   <C>                                   <C>
          LARRY W. SONSINI                       JACK DENNISON                       GORDON K. DAVIDSON
         STEVEN E. BOCHNER                     VICE PRESIDENT AND                   LAIRD H. SIMONS III
          MARK L. REINSTRA                      GENERAL COUNSEL                      JEFFREY R. VETTER
  Wilson Sonsini Goodrich & Rosati           HEALTHEON CORPORATION                    CRAIG A. MENDEN
      Professional Corporation              4600 Patrick Henry Drive                 Fenwick & West LLP
         650 Page Mill Road                  Santa Clara, CA 95054                  Two Palo Alto Square
      Palo Alto, CA 94304-1050                   (408) 876-5000                     Palo Alto, CA 94306
           (650) 493-9300                                                              (650) 494-0600
</TABLE>
 
                              -------------------
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT.
                              -------------------
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box: / /
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering: / /
- ---------
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering: / /
- ---------
    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering: / /
- ---------
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box: / /
                              -------------------
 
   
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
    
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                EXPLANATORY NOTE
 
   
    This Registration Statement contains three forms of prospectuses: (1) one
prospectus to be used in connection with an offering in the United States and
Canada (the "U.S. Prospectus"), (2) one prospectus to be used in connection with
a concurrent offering outside of the United States and Canada (the
"International Prospectus"), and (3) the remaining prospectus to be used in
connection with a non-underwritten sale of Common Stock to an entity controlled
by James H. Clark, the Company's Chairman of the Board of Directors (the
"Non-Underwritten Prospectus"). The U.S. Prospectus and the International
Prospectus are identical in all respects except for the front cover page. The
front cover page of the International Prospectus is included herein after the
final page of the U.S. Prospectus and is labeled "Alternate Page for
International Prospectus." The Non-Underwritten Prospectus is identical to the
U.S. Prospectus, except for the front cover page and pages 2 and 75-79, which
are included herein after the front page of the International Prospectus. Final
forms of each of the Prospectuses will be filed with the Commission pursuant to
Rule 424(b) promulgated under the Securities Act of 1933, as amended.
    
<PAGE>
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY JURISDICTION IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL
PRIOR TO THE REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH
JURISDICTION.
<PAGE>
PROSPECTUS (SUBJECT TO COMPLETION)
 
   
ISSUED OCTOBER 16, 1998
    
 
   
                                7,287,500 SHARES
    
 
                                     [LOGO]
 
                                  COMMON STOCK
                               -----------------
 
   
OF THE 7,287,500 SHARES OF COMMON STOCK OFFERED HEREBY, 5,830,000 SHARES ARE
BEING OFFERED INITIALLY IN THE UNITED STATES AND CANADA BY THE U.S.
 UNDERWRITERS AND 1,457,500 SHARES ARE BEING OFFERED INITIALLY OUTSIDE OF THE
 UNITED STATES AND CANADA BY THE INTERNATIONAL UNDERWRITERS. ALL OF THE SHARES
  OF COMMON STOCK BEING OFFERED HEREBY ARE BEING SOLD BY THE COMPANY. THE
  COMPANY HAS REQUESTED THAT THE U.S. UNDERWRITERS RESERVE UP TO 1,088,500
   SHARES OF COMMON STOCK FROM THE UNDERWRITTEN OFFERING TO BE OFFERED AT
     THE PUBLIC OFFERING PRICE TO CERTAIN PERSONS DESIGNATED BY THE
     COMPANY. SEE "UNDERWRITERS." IN ADDITION, JAMES H. CLARK, THE
     COMPANY'S CHAIRMAN OF THE BOARD OF DIRECTORS, HAS INDICATED THAT AN
     ENTITY THAT HE CONTROLS WILL PURCHASE DIRECTLY FROM THE COMPANY AN
      AGGREGATE OF 2,451,786 SHARES AT THE INITIAL PUBLIC OFFERING PRICE
      CONCURRENTLY WITH THE CLOSING OF THIS OFFERING. PRIOR TO THIS
       OFFERING, THERE HAS BEEN NO PUBLIC MARKET FOR THE COMMON STOCK OF
       THE COMPANY. IT IS CURRENTLY ESTIMATED THAT THE INITIAL PUBLIC
        OFFERING PRICE WILL BE BETWEEN $6.00 AND $8.00 PER SHARE. SEE
        "UNDERWRITERS" FOR A DISCUSSION OF THE FACTORS TO BE CONSIDERED
        IN DETERMINING THE INITIAL PUBLIC OFFERING PRICE. THE SHARES OF
         COMMON STOCK HAVE BEEN APPROVED FOR QUOTATION ON THE NASDAQ
         NATIONAL MARKET UNDER THE SYMBOL "HLTH" SUBJECT TO OFFICIAL
          NOTICE OF ISSUANCE.
    
 
                            ------------------------
 
 THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS" COMMENCING ON
                                 PAGE 4 HEREOF.
                               -----------------
 
   THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
       SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
       COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
         PROSPECTUS. ANY
           REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                             ---------------------
 
                                PRICE $  A SHARE
 
                              -------------------
 
<TABLE>
<CAPTION>
                                                                           UNDERWRITING
                                                     PRICE TO              DISCOUNTS AND             PROCEEDS TO
                                                      PUBLIC              COMMISSIONS(1)             COMPANY(2)
                                               ---------------------  -----------------------  -----------------------
<S>                                            <C>                    <C>                      <C>
PER SHARE....................................            $                       $                        $
TOTAL(3).....................................            $                       $                        $
</TABLE>
 
- ------------
    (1) THE COMPANY HAS AGREED TO INDEMNIFY THE UNDERWRITERS AGAINST CERTAIN
       LIABILITIES, INCLUDING LIABILITIES UNDER THE SECURITIES ACT OF 1933, AS
       AMENDED. SEE "UNDERWRITERS."
    (2) BEFORE DEDUCTING EXPENSES PAYABLE BY THE COMPANY ESTIMATED AT
       $1,700,000.
    (3) THE COMPANY HAS GRANTED THE U.S. UNDERWRITERS AN OPTION, EXERCISABLE
       WITHIN 30 DAYS OF THE DATE HEREOF, TO PURCHASE UP TO AN AGGREGATE OF
       978,750 ADDITIONAL SHARES AT THE PRICE TO PUBLIC, LESS UNDERWRITING
       DISCOUNTS AND COMMISSIONS, FOR THE PURPOSE OF COVERING OVER-ALLOTMENTS,
       IF ANY. IF THE U.S. UNDERWRITERS EXERCISE SUCH OPTION IN FULL, THE TOTAL
       PRICE TO PUBLIC, UNDERWRITING DISCOUNTS AND COMMISSIONS AND PROCEEDS TO
       COMPANY WILL BE $     , $     AND $     , RESPECTIVELY. SEE
       "UNDERWRITERS."
 
                            ------------------------
 
    THE SHARES ARE OFFERED, SUBJECT TO PRIOR SALE, WHEN, AS AND IF ACCEPTED BY
THE UNDERWRITERS NAMED HEREIN AND SUBJECT TO APPROVAL OF CERTAIN LEGAL MATTERS
BY FENWICK & WEST LLP, COUNSEL FOR THE UNDERWRITERS. IT IS EXPECTED THAT
DELIVERY OF THE SHARES WILL BE MADE ON OR ABOUT       , 1998 AT THE OFFICE OF
MORGAN STANLEY & CO. INCORPORATED, NEW YORK, N.Y., AGAINST PAYMENT THEREFOR IN
IMMEDIATELY AVAILABLE FUNDS.
 
                              -------------------
 
MORGAN STANLEY DEAN WITTER                                  GOLDMAN, SACHS & CO.
 
HAMBRECHT & QUIST                                   VOLPE BROWN WHELAN & COMPANY
 
        , 1998
<PAGE>
    NO PERSON IS AUTHORIZED IN CONNECTION WITH ANY OFFERING MADE HEREBY TO GIVE
ANY INFORMATION OR TO MAKE ANY REPRESENTATION OTHER THAN AS CONTAINED IN THIS
PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR BY ANY UNDERWRITER.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN
OFFER TO BUY, ANY SECURITIES OTHER THAN THE REGISTERED SECURITIES TO WHICH IT
RELATES OR AN OFFER TO, OR A SOLICITATION OF, ANY PERSON IN ANY JURISDICTION
WHERE SUCH AN OFFER OR SOLICITATION WOULD BE UNLAWFUL. NEITHER THE DELIVERY OF
THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES,
CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE
COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED HEREIN IS
CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.
                              -------------------
 
    UNTIL            , 1998 (25 DAYS AFTER THE DATE OF THIS PROSPECTUS), ALL
DEALERS EFFECTING TRANSACTIONS IN THE REGISTERED SECURITIES, WHETHER OR NOT
PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS.
THIS DELIVERY REQUIREMENT IS IN ADDITION TO THE OBLIGATIONS OF DEALERS TO
DELIVER A PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR
UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
                              -------------------
 
    FOR INVESTORS OUTSIDE THE UNITED STATES: NO ACTION HAS BEEN OR WILL BE TAKEN
IN ANY JURISDICTION BY THE COMPANY OR BY ANY UNDERWRITER THAT WOULD PERMIT A
PUBLIC OFFERING OF THE REGISTERED SECURITIES OR POSSESSION OR DISTRIBUTION OF
THIS PROSPECTUS IN ANY JURISDICTION WHERE ACTION FOR THAT PURPOSE IS REQUIRED,
OTHER THAN IN THE UNITED STATES. PERSONS INTO WHOSE POSSESSION THIS PROSPECTUS
COMES ARE REQUIRED BY THE COMPANY AND THE UNDERWRITERS TO INFORM THEMSELVES
ABOUT AND TO OBSERVE ANY RESTRICTIONS AS TO THE OFFERING OF THE REGISTERED
SECURITIES AND THE DISTRIBUTION OF THIS PROSPECTUS.
                              -------------------
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                    PAGE
                                    ----
<S>                                 <C>
Prospectus Summary................     3
Risk Factors......................     4
The Company.......................    17
Use of Proceeds...................    18
Dividend Policy...................    18
Capitalization....................    19
Dilution..........................    20
Selected Consolidated Financial
  Data............................    21
Management's Discussion and
  Analysis of Financial Condition
  and Results of Operations.......    23
Business..........................    34
 
<CAPTION>
                                    PAGE
                                    ----
<S>                                 <C>
Management........................    48
Certain Transactions..............    61
Principal Stockholders............    65
Description of Capital Stock......    67
Shares Eligible for Future Sale...    70
Certain United States Tax
  Consequences to Non-U.S. Holders
  of Common Stock.................    72
Underwriters......................    75
Legal Matters.....................    78
Experts...........................    78
Additional Information............    79
Index to Consolidated Financial
  Statements......................   F-1
</TABLE>
 
                             ---------------------
 
    The Company intends to furnish its stockholders with annual reports
containing consolidated financial statements audited by an independent public
accounting firm and quarterly reports containing unaudited consolidated
financial data for the first three quarters of each year.
                              -------------------
 
    The Company's executive offices are located at 4600 Patrick Henry Drive,
Santa Clara, California 95054. Its telephone number at this location is
408-876-5000.
                              -------------------
 
    Healtheon, Healtheon's logo, Virtual Healthcare Network, VHN and
ProviderLink are trademarks of the Company. SBCL SCAN is a trademark of
SmithKline Beecham Clinical Laboratories, Inc., and each other trademark, trade
name or service mark of any other company appearing in this Prospectus is the
property of its holder.
                              -------------------
 
   
    UNLESS OTHERWISE INDICATED, THE INFORMATION IN THIS PROSPECTUS (i) ASSUMES
THE SALE OF 2,451,786 SHARES OF COMMON STOCK IN THE RELATED SALE, (ii) ASSUMES
NO EXERCISE OF THE U.S. UNDERWRITERS' OVER-ALLOTMENT OPTION, (iii) GIVES EFFECT
TO THE FILING, PRIOR TO THE CLOSING OF THIS OFFERING, OF A CERTIFICATE OF
INCORPORATION AUTHORIZING 150,000,000 SHARES OF COMMON STOCK AND 5,000,000
SHARES OF UNDESIGNATED PREFERRED STOCK AND (iv) GIVES EFFECT TO A 5,000,000
SHARE INCREASE IN THE NUMBER OF SHARES RESERVED UNDER THE COMPANY'S 1996 STOCK
PLAN (THE "1996 PLAN") AND THE RESERVATION OF 1,000,000 SHARES OF COMMON STOCK
FOR FUTURE ISSUANCE UNDER THE COMPANY'S 1998 EMPLOYEE STOCK PURCHASE PLAN (THE
"1998 PURCHASE PLAN"). IN THIS PROSPECTUS, UNLESS THE CONTEXT OTHERWISE
INDICATES, REFERENCES TO "HEALTHEON" OR THE "COMPANY" ARE TO HEALTHEON
CORPORATION, A DELAWARE CORPORATION, AND ITS CONSOLIDATED SUBSIDIARIES.
    
                             ---------------------
 
    CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK.
SPECIFICALLY, THE UNDERWRITERS MAY OVER-ALLOT IN CONNECTION WITH THE OFFERING
AND MAY BID FOR, AND PURCHASE, SHARES OF COMMON STOCK IN THE OPEN MARKET. FOR A
DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITERS."
<PAGE>
                             DESCRIPTION OF ARTWORK
 
    At the top of the page there is a colored band with the Healtheon name and
logo on the left and the text "Pioneering the use of the Internet to simplify
workflows, decrease costs, and improve the quality of patient care throughout
the healthcare industry."
 
    On the middle left is the heading "Healtheon's Virtual Healthcare Networks"
over a cloud labeled "Internet" with the Healtheon logo superimposed. The cloud
has pictures of a telephone, a handheld computing device, a television with
internet access, and a computer monitor. The cloud is connected to four
photographs by lightning bolts. The upper left picture shows images from a
laboratory and has the heading "Suppliers" with the subheadings "Laboratories,
Pharmacies, Mail Order Drug and Pharmacy Benefit Managers." The upper right
picture is of doctors and has the heading "Providers" with the subheadings
"Physicians, Hospitals, Integrated Delivery Networks, Independent Practice
Associations and Practice Management Companies." The lower left picture shows
patients and has the heading "Consumers" with the subheadings "Employers",
Government Agencies, Individuals and Benefit Brokers." The lower right picture
shows business people and has the heading "Payors" with the subheadings
"Government Agencies, Insurance Companies, Managed Care Companies, and Preferred
Provider Organizations."
 
    On the middle right are two layers of plugs which connect the Healtheon logo
identified as the "Healtheon Platform." This section has the heading "The
Healtheon Platform" and is connected by a colored band to the cloud on the left.
The upper level of plugs is identified as applications and has plugs for
"Claims, Transcription, Authorizing, Workflow Engine, M.D. Search, Referrals,
Reporting, Rules Engine, Registration, Eligibility, Person Index, Enrollment,
Lab Orders and Prescriptions." There is a plug called "New Applications" over an
arrow coming from three sources -- "Healtheon Applications, 3rd Party
Applications and Legacy Applications." The lower level of plugs is identified as
"Data Objects." One plug, labeled "Data", is over an arrow coming from two
sources -- "Legacy Databases" and "Private Networks." The large Healtheon logo
is surrounded by an inner band labeled "Security" and an outer band labeled
"Flexibility - Usability - Sealability - Availability
 - Extensibility - Manageability - Performance - Fault Tolerance."
 
    The bottom of the page has a large arrow going from left to right with the
heading "Enabling a New Model for Managing Healthcare Information and
Transactions." To the left of the arrow is the term "Fragmented Legacy
Software", and to the right is the term "Network Services Model." Inside the
arrow is the following text: "HEALTHEON'S VIRTUAL HEALTHCARE NETWORKS connect
providers, payors, consumers and suppliers over the public Internet or private
intranets, and provide services and applications that enable the secure exchange
of information, transactions and simplified workflows across the healthcare
industry. At the center of these networks is THE HEALTHEON PLATFORM, an open
framework for providing mission-critical applications and supporting complex
healthcare transactions, while at the same time ensuring scalability,
availability and security."
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY, AND SHOULD BE READ IN
CONJUNCTION WITH, THE MORE DETAILED INFORMATION INCLUDING "RISK FACTORS" AND THE
COMPANY'S CONSOLIDATED FINANCIAL STATEMENTS AND NOTES THERETO APPEARING
ELSEWHERE IN THIS PROSPECTUS.
 
                                  THE COMPANY
 
    Healtheon is pioneering the use of the Internet to simplify workflows,
decrease costs and improve the quality of patient care throughout the healthcare
industry. Healtheon has designed and developed an Internet-based information and
transaction platform (the "Healtheon Platform") that allows it to create Virtual
Healthcare Networks ("VHNs") that facilitate and streamline interactions among
the myriad participants in the healthcare industry. The Healtheon VHN solution
includes a suite of services delivered through applications operating on its
Internet-based platform. Healtheon's solution enables the secure exchange of
information among disparate healthcare information systems and supports a broad
range of healthcare transactions, including enrollment, eligibility
determination, referrals and authorizations, laboratory and diagnostic test
ordering, clinical data retrieval and claims processing. Healtheon provides its
own applications on the Healtheon Platform and also enables third-party
applications to operate on the platform. In addition to Virtual Healthcare
Networks, Healtheon provides comprehensive consulting, development,
implementation and network management services to enable its customers to take
full advantage of the capabilities of the Healtheon Platform. To date, the
Company's revenue has been derived primarily from non-Internet network services,
development and consulting services and from management and operation of
customers' information technology infrastructure. The Company has established
strategic relationships with leading healthcare companies, including United
HealthCare Corporation, SmithKline Beecham Clinical Laboratories, Inc., Brown &
Toland Physician Services Organization and Beech Street Corporation, to enhance
its application portfolio, provide important specialized industry expertise,
increase its market penetration and generate revenue. An investment in the
Common Stock offered hereby involves risks and uncertainties, including the
risks that the healthcare industry may be resistant to the adoption of new
information technology due to concerns about government regulation, patient
confidentiality and security. See "Risk Factors."
 
                                  THE OFFERING
 
   
<TABLE>
<S>                                                                    <C>
Common Stock offered:
  U.S. offering......................................................  5,830,000 shares
  International offering.............................................  1,457,500 shares
    Total............................................................  7,287,500 shares
Common Stock to be outstanding after the offering(1).................  61,444,233 shares
Use of proceeds......................................................  To retire short-term debt and for general corporate
                                                                       purposes, including working capital and capital
                                                                       expenditures. See "Use of Proceeds."
Proposed Nasdaq National Market symbol...............................  "HLTH"
</TABLE>
    
 
                      SUMMARY CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                  SIX MONTHS ENDED
                                                                YEARS ENDED DECEMBER 31,              JUNE 30,
                                                            --------------------------------   ----------------------
                                                             1995       1996         1997         1997         1998
                                                            -------  ----------   ----------   -----------   --------
                                                                     (RESTATED)   (RESTATED)   (RESTATED)
                                                                                               (UNAUDITED)
<S>                                                         <C>      <C>          <C>          <C>           <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA(2):
Revenue...................................................  $ 2,175   $ 11,013     $ 13,390     $  4,286     $ 20,653
Loss from operations......................................   (3,936)   (16,541)     (25,423)     (12,697)     (21,827)
Net loss applicable to common stockholders................  $(4,458)  $(18,606)    $(28,005)    $(14,177)    $(22,331)
Basic and diluted net loss per common share...............  $  (.85)  $  (2.83)    $  (3.88)    $  (1.97)    $  (1.27)
Weighted-average shares outstanding used in computing
 basic and diluted net loss per common share(3)...........    5,246      6,583        7,223        7,193       17,632
Pro forma basic and diluted net loss per common share
 (unaudited)(4)...........................................                         $   (.56)                 $   (.46)
Shares used in computing pro forma basic and diluted net
 loss per common share (unaudited)(3).....................                           44,715                    46,631
</TABLE>
 
<TABLE>
<CAPTION>
                                                    JUNE 30, 1998
                                               -----------------------
                                               ACTUAL   AS ADJUSTED(4)
                                               -------  --------------
                                                         (UNAUDITED)
<S>                                            <C>      <C>
BALANCE SHEET DATA(2):
Cash, cash equivalents and short-term
 investments.................................  $12,801     $ 76,079
Working capital..............................    2,560       65,838
Total assets.................................   49,410      112,688
Long-term obligations, net of current
 portion.....................................    1,459        1,459
Stockholders' equity.........................   31,715       94,993
</TABLE>
 
- -------------
   
(1) Based on the number of shares outstanding as of June 30, 1998. Excludes (i)
    8,997,995 shares of Common Stock issuable upon the exercise of options then
    outstanding, with a weighted average exercise price of $1.17 per share, (ii)
    6,022,523 shares reserved for issuance under the 1996 Plan and the 1998
    Purchase Plan, (iii) 2,077,240 shares of Common Stock issuable upon the
    exercise of warrants then outstanding, with a weighted average exercise
    price of $2.81 per share and 500,000 shares of Common Stock to be subject to
    a warrant with an exercise price of $10.40 per share issuable to a customer
    and (iv) 1,600,000 shares of Common Stock issued in connection with the
    acquisition of Metis, LLC in August 1998, of which 476,548 shares will be
    issued to employees pursuant to restricted stock purchase agreements subject
    to a lapsing right of repurchase, at the option of the Company, over the
    respective vesting periods. Includes 2,451,786 shares to be sold in a
    non-underwritten transaction (the "Related Sale") to an entity controlled by
    James H. Clark, the Company's Chairman of the Board of Directors. In July
    and September 1998, the Company granted options to purchase Common Stock and
    issued shares of Common Stock pursuant to restricted stock agreements equal
    to a total of 3,433,500 shares of Common Stock with a weighted-average
    exercise or purchase price of $5.44 per share. The Company estimates that it
    will record deferred compensation during the three months ending September
    30, 1998 of approximately $6.0 million with regard to these grants and
    issuances. See "Management -- Employee Benefit Plans," "Description of
    Capital Stock" and Notes 10, 11, 15 and 16 of Notes to Consolidated
    Financial Statements.
    
(2) The consolidated financial data reflects the business combination of
    Healtheon and ActaMed Corporation ("ActaMed"), which was accounted for as a
    pooling of interests for accounting purposes. All statements of operations
    prior to the acquisition on May 19, 1998 have been restated to reflect the
    combined results of Healtheon and ActaMed from inception. The consolidated
    statement of operations data for the year ended December 31, 1995 are
    derived solely from the ActaMed statement of operations for such period
    because Healtheon did not commence operations until January 1996. See Notes
    1 and 2 of Notes to Consolidated Financial Statements for a discussion of
    the accounting for the acquisition of ActaMed.
(3) See Note 1 of Notes to Consolidated Financial Statements for an explanation
    of shares used in computing basic and diluted net loss per common share.
   
(4) As adjusted to give effect to (i) the sale of the shares of Common Stock
    offered by the Company in its underwritten initial public offering (the
    "Underwritten Offering") at an assumed initial public offering price of
    $7.00 per share, after deducting estimated underwriting discounts and
    commissions and estimated offering expenses payable by the Company and (ii)
    the Related Sale (assuming an initial public offering price of $7.00 per
    share) and the application of the net proceeds therefrom. See "Use of
    Proceeds" and "Capitalization."
    
 
                                       3
<PAGE>
                                  RISK FACTORS
 
    IN ADDITION TO THE OTHER INFORMATION IN THIS PROSPECTUS, THE FOLLOWING
FACTORS SHOULD BE CONSIDERED CAREFULLY IN EVALUATING AN INVESTMENT IN THE SHARES
OF COMMON STOCK OFFERED HEREBY. THIS PROSPECTUS CONTAINS FORWARD-LOOKING
STATEMENTS THAT INVOLVE RISKS AND UNCERTAINTIES. THE COMPANY'S ACTUAL RESULTS
COULD DIFFER MATERIALLY FROM THE RESULTS CONTEMPLATED BY THESE FORWARD-LOOKING
STATEMENTS AS A RESULT OF CERTAIN FACTORS, INCLUDING THOSE DISCUSSED BELOW AND
ELSEWHERE IN THIS PROSPECTUS.
 
    LIMITED OPERATING HISTORY; ACCUMULATED DEFICIT AND UNPROVEN BUSINESS
MODEL.  The Company was founded in December 1995, commenced operations in
January 1996 and, until late 1997, had not recognized substantial revenue and
was considered to be in the development stage. In May 1998, the Company acquired
ActaMed Corporation ("ActaMed"). As a result of the limited operating history of
Healtheon and ActaMed as a combined entity and the emerging nature of the
markets in which the Company operates, the Company's historical financial data
is of limited value in projecting future operating results. The combined
Company's limited revenue to date has been derived primarily from proprietary
non-Internet network services offered by ActaMed, development and consulting
services and from management and operation of customers' information technology
infrastructure. The Company has incurred net losses since inception and, as of
June 30, 1998, had an accumulated deficit of $71.7 million. The Company intends
to continue investing heavily in acquisitions, infrastructure development,
application development and sales and marketing. As a result, the Company
expects to incur substantial operating losses at least through 1999 and there
can be no assurance that the Company will ever achieve significant revenue or
profitability or that, if significant revenue and profitability are achieved,
they can be sustained. The Company's business model is still in an emerging
stage, and revenue and income potential from the Company's business is unproven,
making an evaluation of the Company and its prospects difficult. Investors
should not use the Company's past results as a basis to predict future
performance. See "Management's Discussion and Analysis of Financial Condition
and Results of Operations."
 
    EMERGING MARKET; UNCERTAIN ACCEPTANCE BY THE HEALTHCARE INDUSTRY.  The
healthcare industry in general has been extremely resistant to adopting new
information technology solutions. Electronic information exchange and
transaction processing by the healthcare industry is still developing, and
complexities in the nature and types of transactions that must be processed have
hindered the development and acceptance of information technology solutions.
There can be no assurance that conversion from traditional methods to electronic
information exchange will continue to occur or that any such conversion will
occur as rapidly as the Company anticipates. Even if the conversion does occur
as rapidly as the Company anticipates, there can be no assurance that healthcare
industry participants will use the Company's applications and services.
 
    Healtheon's success is dependent on its ability to attract a significant
number of customers from the healthcare industry. There can be no assurance that
the Company will be successful in achieving widespread acceptance of its
applications and services or in achieving market share before competitors offer
products, applications or services with features similar to those of the
Company's current or proposed offerings. The Company's business plan is based on
its belief that the value and market appeal of its solution will grow as the
number of participants and the scope of the transaction services available on
the Company's platform increase. If a significant number of participants fail to
adopt the Company's information technology solutions or adopt such solutions
more slowly than anticipated, the number of transactions conducted over the
Company's platform will be lower than expected and the Company may not achieve
the critical mass of users it believes is necessary to enable the success of its
applications and services. The Company anticipates generating a substantial
portion of its revenue from subscription and transaction-based fees.
Consequently, any significant shortfall in the number of users or transactions
occurring over the Company's platform from those anticipated by the Company
could have a material adverse effect on the Company's business, financial
condition and results of operations. See "Business -- Industry Background."
 
                                       4
<PAGE>
    RELIANCE ON STRATEGIC RELATIONSHIPS.  The Company is substantially dependent
on establishing and maintaining strategic relationships with multiple healthcare
industry leaders in a number of healthcare segments to extend the reach of
Healtheon's applications and services to the various participants in the
healthcare industry, to obtain specialized healthcare expertise, to develop and
deploy new applications, to establish the Healtheon brand and to generate
revenue. The Company has limited experience in establishing and maintaining
strategic relationships with healthcare industry participants. The Company's
ability to build strategic relationships is complicated by the fact that some of
the Company's partners and potential partners are possible competitors of the
Company. In addition, as the Company builds relationships with particular
partners, it may become difficult or impossible for the Company to build
relationships with competitors of these partners which may also be key
participants in the healthcare industry. Consequently, it is important that the
Company be perceived as independent of any particular customer or partner.
Moreover, many potential partners may be hesitant to work with the Company until
the Company's applications and services have been successfully introduced and
have achieved market acceptance.
 
    The Company's success will depend both on the success of the other parties
to these strategic relationships and on the ability of these other parties to
drive increased adoption and usage of the Company's platform, applications and
services. Failure of one or more of the Company's strategic relationships to
increase the adoption and usage of the Company's platform, applications and
services could have a material adverse effect on the Company's business,
financial condition and results of operations. To date, the Company has
established only a limited number of strategic relationships, and the loss of
any of these strategic relationships, the failure to enter into new strategic
relationships in the Company's target markets or the failure of the Company's
strategic partners to actively pursue these relationships could have a material
adverse effect on the Company's business, financial condition and results of
operations. See "Business -- Strategy" and "-- Strategic Relationships."
 
    NEED TO EXPAND SUITE OF APPLICATIONS.  The Company believes that its success
is partially dependent upon its ability to introduce new applications in several
healthcare markets in a relatively short period of time. The Company currently
offers a limited number of applications on its platform. The Company does not
have the internal resources and specialized healthcare expertise to develop all
such applications independently and, consequently, must rely on a combination of
internal development, strategic relationships, licensing and acquisitions. Each
of these methods has risks, including the risk of unanticipated costs and
delays. See "-- Reliance on Strategic Relationships" and "-- Risks Associated
with Acquisitions." Any such applications, whether developed internally by the
Company or licensed or acquired from third parties, must be integrated and
customized to operate with existing customer legacy systems and the Company's
platform. These development, integration and customization efforts will require
significant expenditures by the Company, and there can be no assurance that the
Company will be able to develop such additional applications and services or to
integrate or customize such applications and services in a timely manner, or at
all. Even if the Company is able to develop and introduce additional
applications for the Healtheon Platform, there can be no assurance that these
new applications will achieve market acceptance. The inability of Healtheon to
significantly expand the breadth of applications available on its platform in a
timely manner, or the failure of new applications introduced by the Company to
achieve market acceptance, could have a material adverse effect on the Company's
business, financial condition and results of operations.
 
    RISKS ASSOCIATED WITH ACQUISITIONS.  A principal component of the Company's
growth strategy is the acquisition of other healthcare technology companies and
technologies to increase the number and variety of applications on the Company's
platform and to increase the Company's customer base. For example, in May 1998,
Healtheon acquired ActaMed, and in August 1998 the Company acquired
substantially all the assets of Metis, LLC. The Company's ability to expand
successfully through acquisitions depends on many factors, including the
identification of applications, technologies or businesses that are
complementary to those of Healtheon, the integration of disparate technologies
and corporate cultures and the operation of a geographically dispersed company.
In addition, acquisitions could divert management's attention from
 
                                       5
<PAGE>
other business concerns, expose the Company to unforeseen liabilities or risks
associated with entering markets in which the Company may have no direct prior
experience or to risks associated with the market acceptance of acquired
applications and technologies, or result in the loss of key employees of the
Company or the acquired company. See "-- Dependence on Key Personnel."
 
    The Company's future performance will depend on its ability to integrate the
organizations and technologies acquired by the Company, which, even if
successful, may take a significant period of time, will place a significant
strain on the Company's resources, and could subject the Company to additional
expenses during the integration process. In addition, existing or potential
customers might be threatened by certain strategic relationships that acquired
companies have with competitors of Healtheon's customers. As a result, there can
be no assurance that the Company will be able to integrate any acquired
businesses or technologies successfully or in a timely manner, to operate any
acquired businesses on a profitable basis, or to achieve operating synergies
necessary to make the acquisitions successful. There is significant competition
for acquisition opportunities, which may intensify due to increasing
consolidation in the healthcare industry. The Company competes for acquisition
opportunities with other companies that have significantly greater financial and
managerial resources than the Company. The Company's inability to identify
appropriate acquisition opportunities, consummate acquisitions or integrate
acquired applications, technologies, operations, personnel or businesses
successfully could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
    Healtheon intends to use its securities as consideration for future
acquisitions, which may result in potentially dilutive issuances of securities.
To date, the Company has not used cash as acquisition consideration; to the
extent the Company chooses to do so in the future, the Company may be required
to obtain additional financing, and there can be no assurance that such
financing will be available on favorable terms, if at all. In addition,
Healtheon may be required to amortize significant amounts of goodwill and other
intangible assets in connection with future acquisitions and may incur
additional compensation expenses which could have a material adverse effect on
the Company's results of operations. See "-- Future Capital Needs; Uncertainty
of Additional Financing."
 
    MANAGEMENT OF GROWTH.  The Company has rapidly and significantly expanded
its operations and anticipates that significant future expansion will be
required. Such growth has placed, and is expected to continue to place, a
significant strain on the Company's managerial, operational, financial and other
resources. As of June 30, 1998, the Company had grown to 379 employees, from 109
employees on December 31, 1997, primarily as a result of its acquisition of
ActaMed in May 1998, which resulted in the addition of 196 employees. In
addition, the Company has only recently hired its Chief Financial Officer, as
well as other members of senior management. The Company expects that continued
hiring of new personnel will be required to support its business. The Company is
in the process of evaluating its accounting and management information systems
and anticipates that it may implement new systems within the next 12 months. The
Company could experience interruptions to its business in transitioning to new
systems. There can be no assurance that the Company's systems, procedures or
controls will continue to be adequate to support the Company's operations or
that the Company's management will be able to achieve the rapid execution
necessary to exploit the market for the Company's applications and services. See
"Management."
 
    UNCERTAIN ADOPTION OF INTERNET SOLUTIONS.  Growth in the market for the
Company's applications and services will depend upon the adoption of Internet
solutions by healthcare participants. The adoption of Internet solutions for
commerce and communications requires the acceptance of a new way of conducting
business and exchanging information. The healthcare industry, in particular,
relies on legacy systems that may be unable to benefit from Healtheon's
Internet-based platform. The Internet may not prove to be a viable commercial
marketplace for a number of reasons, including inadequate development of the
necessary infrastructure, security concerns, lack of development of
complementary products, such as high speed modems and high speed communication
lines, implementation of competing technologies, delays in the development or
adoption of new standards and protocols required to handle increased levels of
 
                                       6
<PAGE>
Internet activity and governmental regulation. The Internet has experienced, and
is expected to continue to experience, significant growth in the number of users
and volume of traffic. There can be no assurance that Internet infrastructure
will continue to be able to support the demands placed on it by this continued
growth. If critical issues concerning the ability of Internet solutions to
improve business processes are not resolved or if the necessary infrastructure
is not developed, the Company's business, financial condition and results of
operations will be materially adversely affected.
 
    The adoption of the Company's solution depends upon the acceptance of
network computing, in which computers with relatively little software and
storage capacity use Internet protocol networks to access software functions and
databases that are contained on remote servers. Although the Company's
applications and services can generally accommodate legacy and client-server
systems, customers using these systems may be reluctant to adopt new systems
when they have made extensive investment in hardware, software and training for
older systems. Furthermore, although aspects of the network computing model
exist today, large-scale implementation is untested. Problems with speed,
access, server reliability, security and public acceptance of Internet protocol
networks could materially adversely affect the adoption of Internet-based
systems such as the Company's platform. For the Healtheon Platform to be as
successful as the Company desires, healthcare participants must be willing to
allow sensitive information to be stored in Healtheon's databases. Although
Healtheon processes transactions for healthcare participants that maintain
information on proprietary systems, the benefits of connectivity and
sophisticated information management that the Company provides are limited under
such circumstances. If any of the foregoing limits the acceptance or
effectiveness of network computing, the Company's business, financial condition
and results of operations could be materially and adversely affected.
 
    SECURITY, NETWORK AND CONFIDENTIALITY RISKS.  Critical issues concerning the
use of Internet solutions including security, reliability and confidentiality
remain unresolved and may affect the growth and use of such solutions to solve
business problems. If these issues are not addressed successfully, the Internet
may prove not to be a viable means of conducting complex business transactions,
which would have a material adverse effect on the Company's business, financial
condition and results of operations.
 
    The Company currently processes substantially all its customer transactions
and data at its facilities in Santa Clara, California and Atlanta, Georgia.
Although the Company has safeguards for emergencies, the Company has no mirror
processing site to which processing could be transferred in the case of a
catastrophic event at either of these facilities. Consequently, transactions
supported in one facility cannot be supported in the Company's other facility
should a catastrophic event occur. The occurrence of a major catastrophic event
at either the Santa Clara or the Atlanta facility could lead to an interruption
of data processing or loss of stored data and could have a material adverse
effect on the Company's business, financial condition and results of operations.
In addition, the ability of the Company to process health-related transactions
is dependent on the efficient operation of the Internet connections from
customers to its systems. Such connections, in turn, are dependent upon
efficient operation of Web browsers, Internet service providers and Internet
backbone service providers, all of which have had periodic operational problems
or experienced outages in the past. Any such problems or outages could adversely
affect customer satisfaction with the Company's applications and services, which
could have a material adverse effect on the Company's business, financial
condition and results of operations.
 
    The Company retains confidential customer and patient information in its
processing centers. Therefore, it is critical that the Company's facilities and
infrastructure remain secure and that its facilities and infrastructure are
perceived by the marketplace to be secure. Despite the implementation of
security measures, the Company's infrastructure may be vulnerable to physical
break-ins, computer viruses, programming errors, attacks by third parties or
similar disruptive problems. Any material security breach could result in
liability to the Company and damage to its reputation. There can be no assurance
that the Company will be successful in maintaining the security of its
operations or the data stored at its processing centers.
 
                                       7
<PAGE>
    RAPID TECHNOLOGICAL CHANGE; NEW APPLICATION AND SERVICES INTRODUCTIONS.  The
emerging market for healthcare information exchange and transaction processing
is characterized by rapid technological developments, frequent new product
introductions and evolving industry standards. The emerging nature of this
market and its rapid evolution will require that the Company continually improve
the performance, features and reliability of its applications and services,
particularly in response to competing offerings, and that it introduce new
applications and services or enhancements to existing applications and services
as quickly as possible and prior to its competitors. The success of new
applications and services introductions is dependent on several factors,
including proper definition of new applications or services, timely completion
and introduction of new applications and services, differentiation of new
applications and services from those of the Company's competitors and market
acceptance. There can be no assurance that the Company will be successful in
developing and marketing new applications and services that respond to
competitive and technological developments and changing customer needs. The
failure of the Company to develop and introduce new applications and services
successfully on a timely basis and to achieve market acceptance for such
applications and services could have a material adverse effect on the Company's
business, financial condition and results of operations. In addition, the
widespread adoption of new Internet, networking or telecommunication
technologies or standards or other technological changes could render its
applications and services obsolete or require substantial expenditures by the
Company to adapt its applications and services. Moreover, there is a risk that a
competitor's product might become the standard for healthcare information
services. See "Business -- Healtheon's Services" and "-- Development and
Engineering."
 
    UNPROVEN PLATFORM INFRASTRUCTURE AND SCALABILITY.  To date, the type and
volume of transactions processed over the Company's platform and the number of
healthcare participants connected to it have been relatively limited. The
Company must continue to expand and adapt its network infrastructure to
accommodate additional users, increased transaction volumes and changing
customer requirements. The expansion, adaptation and maintenance of the
Company's network infrastructure will require substantial financial, operational
and management resources. Increased usage will place additional stress upon the
Company's network hardware and traffic management systems. Due to the limited
deployment of the Company's services to date, the ability of the Company's
networks to connect and manage a substantially larger number of customers and
transactions at high transmission speeds is as yet unknown, and the Company
faces risks related to the networks' abilities to scale to expected customer
levels while maintaining sufficient performance. Many of the Company's services
agreements contain performance standards, and the failure by the Company to meet
these standards could result in the termination of these agreements, which could
have a material adverse effect on the Company's business, financial condition
and results of operations. There can be no assurance that the Company will be
able to expand or adapt its network infrastructure to meet additional demand or
its customers' changing requirements on a timely basis and at a commercially
reasonable cost, or at all. If the Company's platform architecture is unable to
scale to support the variety and number of transactions and healthcare
participants anticipated, the Company's business, financial condition and
results of operations would be materially adversely affected.
 
   
    CUSTOMER CONCENTRATION AND RELATED PARTY REVENUE.  Four customers have
historically accounted for the substantial majority of the Company's revenue.
United HealthCare Corporation ("United HealthCare"), SmithKline Beecham Clinical
Laboratories, Inc. ("SmithKline Labs"), Brown & Toland Physician Services
Organization ("Brown & Toland") and Beech Street Corporation ("Beech Street")
each accounted for over 10% and collectively accounted for over 90% of the
Company's total revenue for the six months ended June 30, 1998. In addition,
United HealthCare and Brown & Toland, each accounted for over 10% and
collectively accounted for approximately 70% of the Company's total revenue for
the year ended December 31, 1997. In addition, related party customers,
including United HealthCare and SmithKline Labs, accounted for 55% and 45% of
the Company's total revenue for the year ended December 31, 1997 and the six
months ended June 30, 1998, respectively. United HealthCare and SmithKline Labs
will own approximately 13.7% and 6.9%, respectively, of the Company's Common
Stock after the Underwritten Offering and the Related Sale. The Company expects
that a small number of
    
 
                                       8
<PAGE>
customers will continue to account for a substantial portion of the Company's
total revenue for the foreseeable future. The loss of one or more of the
Company's significant customers, or the failure of the Company to generate
anticipated revenue from these customers, could have a material adverse effect
on the Company's business, financial condition and results of operations. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and "Business -- Strategic Relationships."
 
    COMPETITION.  The market for healthcare information services is intensely
competitive, rapidly evolving and subject to rapid technological change. Many of
the Company's actual and potential competitors have announced or introduced
Internet strategies. The Company's competitors can be divided into several
groups: healthcare information software vendors, including HBO & Company and
Shared Medical Systems Corporation; healthcare electronic data interchange
companies, including ENVOY Corporation and National Data Corporation; and large
information technology consulting service providers, including Andersen
Consulting, International Business Machines Corporation and Electronic Data
Systems Corporation. Each of these companies is expected to compete with the
Company within certain segments of the healthcare information technology market.
Furthermore, major software information systems companies and others, including
those specializing in the healthcare industry that are not presently offering
applications competitive with those offered by the Company, may enter the
Company's markets. In some cases, large customers may have the ability to
compete directly with the Company as well. The Company also competes with
smaller regional competitors. Many of the Company's competitors and potential
competitors have significantly greater financial, technical, product
development, marketing and other resources and greater market recognition than
the Company. Many of the Company's competitors also currently have, or may
develop or acquire, substantial installed customer bases in the healthcare
industry. As a result of these factors, the Company's competitors may be able to
respond more quickly to new or emerging technologies and changes in customer
requirements or to devote greater resources to the development, promotion and
sale of their applications or services than the Company. There can be no
assurance that the Company will be able to compete successfully against current
and future competitors or that competitive pressures faced by the Company will
not materially adversely affect its business, financial condition and results of
operations.
 
    CHANGES IN THE HEALTHCARE INDUSTRY.  The healthcare industry is highly
regulated and is subject to changing political, economic and regulatory
influences that may affect the procurement practices and operation of healthcare
organizations. Changes in current healthcare financing and reimbursement systems
could result in the need for unplanned enhancements of applications or services,
in delays or cancellations of orders or in the revocation of endorsement of the
Company's applications and services by healthcare participants. Federal and
state legislatures have periodically considered programs to reform or amend the
U.S. healthcare system at both the federal and state level. These programs may
contain proposals to increase governmental involvement in healthcare, lower
reimbursement rates or otherwise change the environment in which healthcare
industry participants operate. Healthcare industry participants may react to
these proposals and the uncertainty surrounding such proposals by curtailing or
deferring investments, including investments in the Company's applications and
services. The Company cannot predict what impact, if any, such proposals or
healthcare reforms might have on the Company. In addition, many healthcare
providers are consolidating to create integrated healthcare delivery systems
with greater regional market power. As a result, these emerging systems could
have greater bargaining power, which might lead to price erosion for the
Company's applications and services. The failure of the Company to maintain
adequate price levels could have a material adverse effect on the Company's
business, financial condition and results of operations. As the number of
healthcare delivery enterprises decreases due to further industry consolidation,
each new customer will become more significant and competition for such
customer, will become greater.
 
    GOVERNMENT REGULATION.  Laws and regulations may be adopted with respect to
the Internet or other on-line services covering issues such as user privacy,
pricing, content, copyrights, distribution and characteristics and quality of
products and services. The adoption of any additional laws or regulations may
 
                                       9
<PAGE>
impede the growth of the Internet or other on-line services, which could, in
turn, decrease the demand for the Company's applications and services and
increase the Company's cost of doing business, or otherwise have an adverse
effect on the Company's business, financial condition and results of operations.
For example, under current Health Care Financing Administration guidelines,
Medicare eligibility information cannot be transmitted over the Internet.
Moreover, the applicability to the Internet of existing laws in various
jurisdictions governing issues such as property ownership, sales and other
taxes, libel and personal privacy is uncertain and may take years to resolve.
Any such new legislation or regulation, the application of laws and regulations
from jurisdictions whose laws do not currently apply to the Company's business,
or the application of existing laws and regulations to the Internet and other
online services could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
    The confidentiality of patient records and the circumstances under which
such records may be released for inclusion in the Company's databases are
subject to substantial regulation by state governments. These state laws and
regulations govern both the disclosure and the use of confidential patient
medical record information. Although compliance with these laws and regulations
is at present principally the responsibility of the hospital, physician or other
healthcare provider, regulations governing patient confidentiality rights are
evolving rapidly. Additional legislation governing the dissemination of medical
record information has been proposed at both the state and federal level. This
legislation may require holders of such information to implement security
measures that may require substantial expenditures by the Company. There can be
no assurance that changes to state or federal laws will not materially restrict
the ability of healthcare providers to submit information from patient records
using the Company's applications.
 
    Legislation currently being considered at the federal level could impact the
manner in which the Company conducts its business. For example, the Health
Insurance Portability and Accountability Act of 1996 ("HIPAA") mandates the use
of standard transactions, standard identifiers, security and other provisions by
the year 2000. The Company is designing its platform and applications to enable
compliance with the proposed regulations; however, until such regulations become
final, they could change, which could require the Company to expend additional
resources to comply with the revised standards. In addition, the success of the
Company's compliance efforts may be dependent on the success of healthcare
participants in dealing with the standards.
 
    International regulations with respect to the Internet, privacy and
transborder data flows are considerably more developed than such regulations in
the United States. The Company intends to develop applications and services to
be used on a worldwide basis and, consequently, will be required to comply with
international regulations regarding the Internet and electronic commerce, as
well as with U.S. regulations. The Company has not evaluated the effect that
these regulations would have on its business, and there can be no assurance that
such regulations will not have an adverse effect on the Company's ability to
compete internationally.
 
    The United States Food and Drug Administration ("FDA") is responsible for
assuring the safety and effectiveness of medical devices under the Federal Food,
Drug and Cosmetic Act. Computer applications and software are considered medical
devices and subject to regulation by the FDA when they are indicated, labeled or
intended to be used in the diagnosis of diseases or other conditions, or in the
cure, mitigation, treatment or prevention of disease, or are intended to affect
the structure or function of the body. The Company does not believe that any of
its current applications or services are subject to FDA jurisdiction or
regulation; however, the Company plans to expand its application and service
offerings into areas that may subject it to FDA regulation. The Company has no
experience in complying with FDA regulations. Healtheon's compliance with FDA
regulations could prove to be time consuming, burdensome and expensive, which
could have a material adverse effect on the Company's ability to introduce new
applications or services in a timely manner.
 
    VARIABILITY IN QUARTERLY OPERATING RESULTS.  The Company's quarterly revenue
and operating results have varied in the past and are likely to vary
substantially in the future. Quarterly revenue and operating
 
                                       10
<PAGE>
results may fluctuate as a result of a number of factors, including: changes in
relationships with the Company's present or prospective strategic partners; the
timing and significance of any future acquisitions by the Company; the timing
and significance of the entry by the Company into new healthcare markets; the
timing and significance of new customer acquisitions; changes in the Company's
application and service offerings; software defects, delays in application
development and other quality factors; demand for the Company's applications and
services; the ability of the Company to meet project milestones or otherwise
meet customer expectations; the mix of consulting and transaction fee revenue
recorded by the Company; variability in demand for Internet-based healthcare
solutions; changes within the healthcare industry; and seasonality of demand.
 
    The Company intends to increase its marketing, sales, development and
engineering, and administrative activities and to increase other operating
expenses as required to integrate the operations, technologies and networks of
recent and any future acquisitions and to expand its platform infrastructure and
operations. The Company anticipates that these expenses could significantly
precede any revenue generated by such increased spending. If the Company does
not experience significantly increased revenue from these efforts, the Company's
business, financial condition and results of operations could be materially and
adversely affected. In addition, the Company's expense levels are based in part
upon its expectations concerning future revenue and are relatively fixed in the
short-term. Consequently, if the Company's revenue is below expectations in any
period, the Company may not be able to adjust its spending levels in a timely
manner, which could have an immediate and material adverse effect on the
Company's business, financial condition and results of operations. For these and
other reasons, in some future quarters, the Company's results of operations may
fall below the expectations of securities analysts or investors, which could
have a material adverse effect on the market price of the Company's Common
Stock. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations."
 
    RISK OF PRODUCT-RELATED CLAIMS.  Applications and services as complex as
those offered or developed by the Company frequently contain defects or
failures. There can be no assurance that, despite testing by the Company and
potential customers, defects or errors will not occur in existing or new
applications or that the Company's platform will not experience problems in
security, availability, scalability or other critical features, any of which
could result in loss of or delay in revenue, loss of market share, failure to
achieve market acceptance, diversion of development resources, injury to the
Company's reputation, or increased insurance costs, any of which could have a
material adverse effect on the Company's business, financial condition and
results of operations. Furthermore, many of the Company's services agreements
contain performance standards, and the failure by the Company to meet these
standards could result in the early termination of these agreements, which could
have a material adverse effect on the Company's business, financial condition
and results of operation.
 
    Many of the Company's strategic relationships and services agreements
involve the development, implementation and maintenance of Internet or
electronic data interchange-based applications and services that are critical to
the operations of its clients' businesses. In many cases, these services are
provided within a complex environment of legacy or client-server systems or rely
on third party applications. The Company's failure or inability to meet a
client's expectations in the performance of its services (particularly with
regard to proprietary information and patient records) could injure the
Company's reputation or result in a claim for substantial damages against the
Company, regardless of the Company's responsibility for such failure. In
addition, if healthcare industry participants receive incorrect information or
fail to receive required information in a timely manner, patient care may be
adversely affected, which could lead to claims of liability against the Company.
There can be no assurance that the Company's insurance would protect it from
such risks. Any unauthorized disclosure or use of this confidential information
could result in a claim for substantial damages.
 
    The Company attempts to limit contractually its damages arising from
negligent acts, errors, mistakes or omissions in rendering its services;
however, there can be no assurance that any contractual protections will be
enforceable or would otherwise protect the Company from liability for damages.
Although the
 
                                       11
<PAGE>
Company maintains general liability insurance coverage that it believes is
adequate, including coverage for errors and omissions, there can be no assurance
that such coverage will continue to be available on reasonable terms or will be
available in sufficient amounts to cover one or more large claims, or that the
insurer will not disclaim coverage as to any future claim. The successful
assertion of one or more large claims against the Company, with respect to which
the Company is uninsured or that exceed available insurance coverage or result
in changes to the Company's insurance policies, including premium increases or
the imposition of a large deductible or co-insurance requirements, could
adversely affect the Company's business, financial condition and results of
operations.
 
    DEPENDENCE ON PROPRIETARY TECHNOLOGY; POTENTIAL LITIGATION.  The Company
relies upon a combination of trade secret, copyright and trademark laws, license
agreements, confidentiality procedures, employee nondisclosure agreements and
technical measures to protect its intellectual property. Substantial litigation
regarding intellectual property rights exists in the Company's industry, and the
Company expects that its applications may be increasingly subject to third-party
infringement claims as the number of competitors in the Company's industry grows
and the functionality of applications overlaps. There can be no assurance that
the Company will be able to prevent misappropriation of its intellectual
property. Effective intellectual property protection may not be available in
every country in which the Company intends to offer its services. There can be
no assurance that the steps taken by the Company to protect its proprietary
rights will be adequate or that third parties will not infringe or
misappropriate the Company's copyrights, trademarks and similar proprietary
rights, or that the Company will be able to detect unauthorized use of its
intellectual property and take appropriate steps to enforce its rights. There
can be no assurance that other parties will not assert infringement claims
against the Company. Such claims, even if not meritorious, could result in the
expenditure of significant financial and managerial resources by the Company. If
it were determined that the Company infringed the intellectual property rights
of third parties, the Company would be required to develop non-infringing
technology, obtain a license to such intellectual property or cease selling the
applications that contain the infringing intellectual property. There can be no
assurance that the Company would be able to develop noninfringing technology or
that it could obtain a license on commercially reasonable terms, or at all.
Moreover, if it is determined that the Company infringed the intellectual
property rights of others, it could be required to pay substantial damages,
which could have a material adverse effect on the Company's business, financial
condition and results of operations.
 
    LENGTHY SALES AND IMPLEMENTATION CYCLES FOR CERTAIN APPLICATIONS AND
SERVICES.  A key element of the Company's strategy is to market its applications
and services directly to large healthcare organizations. Based on its sales
experience to date, the Company expects that the sale and implementation of its
applications to these large healthcare organizations will be lengthy and involve
a significant technical evaluation and commitment of capital and other resources
by these organizations. Therefore, the Company expects that the sale and
implementation of the Company's healthcare applications and services will be
subject to the risk of delays associated with customers' internal budgets and
other procedures for approving large capital expenditures, deploying new
technologies within their networks and testing and accepting new technologies
that affect key operations. For these and other reasons, the sales and
implementation cycles associated with certain of the Company's applications and
services are expected to be unpredictable and are subject to a number of
significant risks that are beyond the Company's control.
 
    In addition, the Company will be required to expend substantial resources to
integrate its applications with the existing architectures of these large
healthcare organizations. The Company has very limited experience in integrating
its applications with large legacy and client-server architectures, and there
can be no assurance that it will not experience delays in integrating its
applications into these large healthcare organizations. Any delays in the
Company's implementation of its applications would delay its ability to generate
revenue from such applications. Because of the anticipated lengthy
implementation cycle and the potentially large size of such orders, if orders
forecasted for a specific customer for a particular quarter are not realized or
revenue is not otherwise recognized in that quarter, the Company's business,
financial condition and results of operations could be materially adversely
affected. See "-- Variability in Quarterly
 
                                       12
<PAGE>
Operating Results" and "Management's Discussion and Analysis of Financial
Condition and Results of Operations."
 
    YEAR 2000 COMPLIANCE.  Many currently installed computer systems and
software products are unable to distinguish between twentieth century dates and
twenty-first century dates. As a result, many companies' software and computer
systems may need to be upgraded or replaced to comply with such "Year 2000"
requirements. The Company's business is dependent on the operation of numerous
systems that could potentially be impacted by Year 2000 related problems. Those
systems include, among others: hardware and software systems used by the Company
to deliver services to its customers (including the Company's proprietary
software systems as well as hardware and software supplied by third parties);
communications networks, such as the Internet and private intranets, which the
Company depends on to provide electronic transactions to its customers; the
internal systems of the Company's customers and suppliers; the hardware and
software systems used internally by the Company in the management of its
business; and non-information technology systems and devices used by the Company
in its business, such as telephone systems and building systems.
 
    The Company has internally reviewed the proprietary software systems it uses
to deliver services to its customers. Although the Company believes that its
internally developed applications and systems are designed to be Year 2000
compliant, the Company utilizes third-party equipment and software that may not
be Year 2000 compliant. Also, two systems acquired by ActaMed, specifically SBCL
SCAN ("SCAN") and ProviderLink, which together accounted for approximately 47%
of the Company's total revenue in the first six months of 1998, will require
modifications to become Year 2000 compliant. The Company plans to release Year
2000 upgrades to these systems in late 1998 or early 1999. The Company estimates
the cost of these Year 2000 upgrades to SCAN and ProviderLink to be less than
$1.0 million. In addition, the Company's SCAN product is installed on
approximately 4,400 Company-owned workstations located in provider offices. Many
of these workstations are not Year 2000 compliant and must be upgraded or
replaced by the Company. The Company expects the cost of such upgrades or
replacements to be less than $1.0 million. However, the Company could experience
delays and cost overruns in the development of these upgrades, such upgrades
could contain defects and the Company could experience difficulties in getting
the Company's installed base of physicians to implement these upgrades in a
timely manner. If the Company experiences these or other difficulties in
developing and deploying its Year 2000 upgrades, revenues from SCAN and
ProviderLink could be significantly reduced, which could have a material adverse
effect on the Company's business, financial condition and results of operations.
Failure of such third-party or Healtheon equipment or software to operate
properly with regard to the Year 2000 and thereafter could require the Company
to incur unanticipated expenses to remedy any problems, which could have a
material adverse effect on the Company's business, financial condition and
results of operations. In certain of its agreements, the Company warrants that
its applications and services are Year 2000 compliant. Failure of the Company's
applications and services to be Year 2000 compliant could result in the
termination of these agreements or in liability for damages, the occurrence of
either of which could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
    Furthermore, the success of the Company's efforts may depend on the success
of other healthcare participants in dealing with their Year 2000 issues. Many of
these organizations are not Year 2000 compliant, and the impact of widespread
customer failure on the Company's systems is difficult to determine. Customer
difficulties due to Year 2000 issues could interfere with healthcare
transactions or information, which might expose the Company to significant
potential liability. If client failures result in the failure of Healtheon
systems, the Company's business, financial condition and results of operations
would be materially adversely affected. Furthermore, the purchasing patterns of
these customers or potential customers may be affected by Year 2000 issues as
companies expend significant resources to become Year 2000 compliant. The costs
of becoming Year 2000 compliant for current or potential customers may result in
reduced funds being available to purchase and implement the Company's
applications and services.
 
                                       13
<PAGE>
    The Company, with the assistance of an independent consulting firm
specializing in Year 2000 issues, is conducting a formal assessment of its Year
2000 exposure in order to determine what steps beyond those identified by the
Company's internal review may be advisable. The Company expects to complete such
assessment in the fourth quarter of 1998. The Company does not presently have a
contingency plan for handling Year 2000 problems that are not detected and
corrected prior to their occurrence. Any failure of the Company to address
unforeseen Year 2000 issues could adversely affect the Company's business,
financial condition and results of operations.
 
   
    FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FINANCING.  The Company
currently anticipates that the net proceeds from the Underwritten Offering and
the Related Sale, together with its available cash resources and credit
facilities, will be sufficient to meet its presently anticipated working
capital, capital expenditure and business expansion requirements for at least
the next 12 months. However, the Company may need to raise additional funds
prior to such time to support expansion, develop new or enhanced applications
and services, respond to competitive pressures, acquire complementary businesses
or technologies or take advantage of unanticipated opportunities. The Company's
future liquidity and capital requirements will depend upon numerous factors,
including the success of the Company's existing and new application and service
offerings and competing technological and market developments. The Company may
be required to raise additional funds through public or private financing,
strategic relationships or other arrangements. There can be no assurance that
such additional funding, if needed, will be available on terms acceptable to the
Company, or at all.
    
 
    NO PRIOR PUBLIC MARKET; POSSIBLE VOLATILITY OF COMMON STOCK PRICE.  Prior to
the Underwritten Offering, there has been no public market for the Company's
Common Stock, and there can be no assurance that an active public market for the
Common Stock will develop or be sustained after this offering. The initial
public offering price, which will be established by negotiation between the
Company and the U.S. Underwriters of the Underwritten Offering based upon a
number of factors, may not be indicative of prices that will prevail in the
public market. See "Underwriters" or "Plan of Distribution" for a discussion of
the factors to be considered in determining the initial public offering price.
The stock market has experienced significant price and volume fluctuations that
have particularly affected the market prices of equity securities of many
technology companies and that often have been unrelated or disproportionate to
the operating performance of such companies. These broad market fluctuations may
adversely affect the market price of the Company's Common Stock. In addition,
the market price of the Company's Common Stock is likely to be highly volatile
and could be subject to wide fluctuations in response to quarterly variations in
operating results, announcements of technological innovations, announcements
relating to strategic relationships of the Company, developments in the
Company's relationships with its customers and conditions affecting the Internet
or healthcare industries, in general, or other events or factors. In the past,
following periods of volatility in the market price of a company's securities,
securities class action litigation has often been instituted against such a
company. Such litigation could result in substantial costs and the diversion of
management's attention and resources, which would have a material adverse effect
on the Company's business, financial condition and results of operations.
 
    DEPENDENCE ON KEY PERSONNEL.  The Company's future success will be highly
dependent on the performance of its senior management team and other key
employees. The Company's success will also depend on its ability to attract,
integrate, motivate and retain additional highly skilled technical personnel,
particularly trained and experienced professionals capable of developing,
selling and installing complex healthcare information systems. There is intense
competition for personnel at all levels, including senior management and
technical professionals. The Company's management believes that its executive
management, including W. Michael Long, the Company's Chief Executive Officer,
and Pavan Nigam, the Company's Vice President. Engineering, is critical to the
success of Healtheon. The Company does not maintain key person life insurance
for any of its officers or key employees. The loss of the services of any member
of the Company's senior management team or other key employees or the failure of
the Company to attract, integrate, motivate and retain additional key employees
could have a material adverse effect on
 
                                       14
<PAGE>
the Company's business, financial condition and results of operations. See
"Business -- Employees" and "Management."
 
    CERTAIN ANTI-TAKEOVER PROVISIONS.  Certain provisions of the Company's
Certificate of Incorporation and Bylaws could have the effect of delaying,
deferring or preventing a change of control of the Company. These provisions
provide, among other things, that the Board of Directors is divided into three
classes to serve staggered three-year terms, that stockholders may not take
actions by written consent and that the ability of stockholders to present
proposals or director nominations at stockholder meetings is restricted. In
addition, the Company is subject to the anti-takeover provisions of Section 203
of the Delaware General Corporation Law, which will prohibit the Company from
engaging in a "business combination" with an "interested stockholder" for a
period of three years after the date of the transaction in which the person
became an interested stockholder, unless the business combination is approved in
a prescribed manner.
 
    Furthermore, the Company's Certificate of Incorporation and Bylaws provide
that the Company will indemnify its directors and officers to the fullest extent
permitted by Delaware law. The Company also intends to enter into separate
indemnification agreements with its directors and executive officers. Such
indemnification provisions and agreements may be broad enough to cover losses
that such officers and directors may incur in connection with investigations and
legal proceedings resulting from services performed in connection with takeover
defense measures, and may have the effect of preventing changes in the
management of the Company. See "Description of Capital Stock."
 
    In addition, the Board of Directors has the authority to issue up to
5,000,000 shares of Preferred Stock and to determine the price, rights,
preferences, privileges and restrictions, including voting rights, of those
shares without any further vote or action by the stockholders. The rights of the
holders of Common Stock will be subject to, and may be adversely affected by,
the rights of the holders of any Preferred Stock that may be issued in the
future. The issuance of Preferred Stock could have the effect of making it more
difficult for a third party to acquire a majority of the outstanding voting
stock of the Company.
 
   
    SHARES ELIGIBLE FOR FUTURE SALE.  Sales of a substantial number of shares of
Common Stock in the public market following the Underwritten Offering could
adversely affect the market price of the Company's Common Stock. The number of
shares of Common Stock available for sale in the public market is limited by
restrictions under the Securities Act of 1933, as amended (the "Securities
Act"), and lock-up agreements executed by the security holders of the Company
under which such security holders have agreed not to sell or otherwise dispose
of any of their shares for a period of 180 days after the date of this
Prospectus without the consent of Morgan Stanley & Co. Incorporated. Morgan
Stanley & Co. Incorporated may, however, in its sole discretion and at any time
without notice, release all or any portion of the shares subject to lock-up
agreements. In addition to the 9,739,286 shares of Common Stock offered in the
Underwritten Offering (assuming no exercise of the U.S. Underwriters'
over-allotment option) and in the Related Sale, there will be 54,317,201 shares
of Common Stock outstanding as of the date of this Prospectus. On the date of
this Prospectus, 689,609 shares (in addition to 6,199,000 of the shares offered
in the Underwritten Offering) will be eligible for immediate sale. Upon the
expiration of lock-up agreements 180 days after the date of this Prospectus, an
additional 53,214,440 shares (including 1,088,500 of the shares to be sold in
the Underwritten Offering and the 2,451,786 shares to be sold in the Related
Sale) will become eligible for sale in the public market, subject in the case of
all but 9,748,934 shares to the volume limitations and other conditions of Rule
144 adopted under the Securities Act. In addition, the Company intends to file a
registration statement on Form S-8 with the Securities and Exchange Commission
shortly after this offering covering the 13,994,510 shares of Common Stock
reserved for issuance under the 1996 Plan and the Company's 1998 Purchase Plan.
The holders of approximately 43,218,397 shares of Common Stock are also entitled
to certain rights with respect to registration of such shares of Common Stock
for offer or sale to the public. If such holders, by exercising their
registration rights, cause a large number of shares to be registered and sold in
the public market, such sales could have a material adverse effect on the market
price for the Company's Common Stock.
    
 
                                       15
<PAGE>
   
    BENEFITS OF THE OFFERINGS TO AND CONTROL BY OFFICERS, DIRECTORS AND
AFFILIATED ENTITIES.  Upon the completion of the Underwritten Offering and the
Related Sale, the present executive officers and directors of the Company and
their affiliates will, in the aggregate, beneficially own 45,459,665 shares of
Common Stock, which shares will represent approximately 67.5% of the Company's
outstanding Common Stock (66.5% if the U.S. Underwriters' over-allotment option
is exercised in full). Existing stockholders prior to the offerings have paid an
average of $1.97 per share for the Common Stock held by them, as compared to an
assumed initial public offering price of $7.00 per share, representing an
increase in the market price per share of $5.03, or an aggregate increase of
approximately $228.7 million. This offering will also create a public market for
the resale, and substantially increase the market value, of shares held by
existing investors. Furthermore, such persons, acting together, will be able to
significantly influence the management and affairs of the Company and will have
the ability to control all matters requiring stockholder approval, including the
election and removal of directors and the approval of significant corporate
transactions, such as a merger or consolidation of the Company or a sale of
significantly all of the Company's assets. Such concentration of ownership may
have the effect of delaying, deferring or preventing a change in control of the
Company, and may adversely affect the market price of the Company's Common Stock
and the voting and other rights of the Company's other stockholders. See
"Principal Stockholders."
    
 
                                       16
<PAGE>
                                  THE COMPANY
 
    Healtheon is pioneering the use of the Internet to simplify workflows,
decrease costs and improve the quality of patient care throughout the healthcare
industry. Healtheon has designed and developed an Internet-based information and
transaction platform (the "Healtheon Platform") that allows it to create Virtual
Healthcare Networks ("VHNs") that facilitate and streamline interactions among
the myriad participants in the healthcare industry. The Healtheon VHN solution
includes a suite of services delivered through applications operating on its
Internet-based platform. Healtheon's solution enables the secure exchange of
information among disparate healthcare information systems and supports a broad
range of healthcare transactions, including enrollment, eligibility
determination, referrals and authorizations, laboratory and diagnostic test
ordering, clinical data retrieval and claims processing. Healtheon provides its
own applications on the Healtheon Platform and also enables third-party
applications to operate on the platform. In addition to Virtual Healthcare
Networks, Healtheon provides comprehensive consulting, development,
implementation and network management services to enable its customers to take
full advantage of the capabilities of the Healtheon Platform. The Company has
established strategic relationships with leading healthcare companies, including
United HealthCare Corporation, SmithKline Beecham Clinical Laboratories, Inc.,
Brown & Toland Physician Services Organization and Beech Street Corporation, to
enhance its application portfolio, provide important specialized industry
expertise, increase its market penetration and generate revenue.
 
    The Internet's open architecture, universal accessibility and growing
acceptance make it an increasingly important environment for
business-to-business and business-to-consumer interaction. Use of the Internet
is rapidly expanding from simple information publishing, messaging, and data
gathering to critical business transactions and confidential communications. For
many industries, the Internet is connecting previously disconnected business
processes and allowing companies to automate workflows, lower distribution costs
and extend their market reach. The Company believes the healthcare industry,
because of its size, fragmentation and extreme dependence on information
exchange, is particularly well suited to benefit from greater use of the
Internet.
 
    The Healtheon Platform is designed to ensure security, scalability,
reliability, availability and flexibility. The platform includes a CORBA-based
distributed application framework that allows reliable, simultaneous access by
large numbers of users. Open architecture and object-oriented design permit
standards-based integration with legacy systems and third-party applications,
and a combination of advanced technologies, including digital encryption,
digital certificates and audit trail tracking, ensures security. The platform is
deployed on redundant, fault tolerant servers with associated software to create
24-hour availability.
 
    Healtheon's objective is to become the leading provider of Internet-based
transaction and information services to the healthcare industry. The Company's
strategy includes leveraging Internet technology to provide secure transactions
and communications among a broad range of healthcare participants, regardless of
their computing platforms; expanding the functionality and transaction
capability of its platform through the development, acquisition or enablement of
Internet-based applications; forming additional strategic relationships to
increase its portfolio of applications and services, to increase the number of
connected healthcare participants and to provide specialized industry expertise
for its new applications; targeting regional markets where it can gain critical
mass, thereby expanding nationally region by region; and employing its
usage-based business model to reduce the initial investment required by
customers to obtain the benefits of high-end information technology systems and
enable physicians, small organizations and individuals to gain access to
advanced information systems for the first time.
 
    The Company was incorporated in Delaware in December 1995 and commenced
operations in January 1996. In May 1998, the Company completed its acquisition
of ActaMed, a leading provider of network services to the healthcare industry.
In August 1998, the Company completed its acquisition of Metis, LLC, a leading
consulting, design and development firm focused on Internet and intranet-based
solutions for medical centers and integrated delivery networks.
 
                                       17
<PAGE>
                                USE OF PROCEEDS
 
   
    The net proceeds to the Company from the sale of the 7,287,500 shares of
Common Stock offered in the Underwritten Offering and the sale of 2,451,786
shares of Common Stock in the Related Sale are estimated to be approximately
$63.3 million (approximately $69.7 million if the U.S. Underwriters' over-
allotment option is exercised in full), at an assumed initial public offering
price of $7.00 per share and after deducting estimated underwriting discounts
and commissions and estimated offering expenses payable by the Company. The
principal purposes of this offering are to obtain additional capital, to create
a public market for the Company's Common Stock, to enhance the ability of the
Company to acquire other businesses, products or technologies, and to facilitate
future access by the Company to public equity markets.
    
 
    The Company currently expects to use approximately $1.5 million of the net
proceeds to retire short-term debt and use the remainder of the net proceeds of
this offering for general corporate purposes, including working capital and
capital expenditures. The Company may also use a portion of the net proceeds of
this offering to acquire or invest in complementary businesses or technologies,
although the Company has no present commitments or agreements with respect to
any such acquisition or investment. However, the Company from time to time
enters into nondisclosure agreements with third parties for the purpose of
evaluating strategic transactions involving complementary businesses or
technologies. Pending such uses, the Company intends to invest such funds in
short-term, interest-bearing, investment grade securities.
 
                                DIVIDEND POLICY
 
    The Company has never declared or paid any cash dividends on its Common
Stock or other securities and does not intend to pay any cash dividends with
respect to its Common Stock in the foreseeable future. The Company intends to
retain any earnings for use in the operation of its business and to fund future
growth. In addition, the terms of the Company's credit agreement prohibit the
payment of cash dividends on its capital stock.
 
                                       18
<PAGE>
                                 CAPITALIZATION
 
   
    The following table sets forth the total capitalization of the Company as of
June 30, 1998 (i) on an actual basis and (ii) on an as adjusted basis to reflect
the receipt by the Company of the estimated net proceeds from the sale of the
7,287,500 shares of Common Stock offered in the Underwritten Offering and the
sale of 2,451,786 shares of the Common Stock in the Related Sale (at an assumed
initial public offering price of $7.00 per share) and after deducting estimated
underwriting discounts and commissions and estimated offering expenses payable
by the Company.
    
 
<TABLE>
<CAPTION>
                                                                                                JUNE 30, 1998
                                                                                           -----------------------
                                                                                             ACTUAL    AS ADJUSTED
                                                                                           ----------  -----------
                                                                                               (IN THOUSANDS)
<S>                                                                                        <C>         <C>
Capital lease obligations, net of current portion........................................  $    1,459   $   1,459
                                                                                           ----------  -----------
Stockholders' equity:
  Convertible Preferred Stock, $.0001 par value; no shares authorized, no shares issued
    or outstanding, actual; 5,000,000 shares authorized, no shares issued or outstanding,
    as adjusted..........................................................................          --          --
  Common Stock, $.0001 par value; 75,000,000 shares authorized, 51,704,947 shares issued
    and outstanding, actual; 150,000,000 shares authorized, 61,444,233 shares issued and
    outstanding, as adjusted(1)..........................................................           5           6
  Additional paid-in capital.............................................................     106,832     170,109
  Deferred stock compensation............................................................      (3,411)     (3,411)
  Accumulated deficit....................................................................     (71,711)    (71,711)
                                                                                           ----------  -----------
    Total stockholders' equity...........................................................      31,715      94,993
                                                                                           ----------  -----------
      Total capitalization...............................................................  $   33,174   $  96,452
                                                                                           ----------  -----------
                                                                                           ----------  -----------
</TABLE>
 
- ---------
 
   
(1) Excludes (i) 8,997,995 shares of Common Stock issuable upon the exercise of
    options outstanding on June 30, 1998, with a weighted average exercise price
    of $1.17 per share, (ii) 6,022,523 shares reserved for issuance under the
    1996 Plan and the 1998 Purchase Plan, (iii) 2,077,240 shares of Common Stock
    issuable upon the exercise of warrants then outstanding, with a weighted
    average exercise price of $2.81 per share, and 500,000 shares of Common
    Stock to be subject to a warrant with an exercise price of $10.40 per share
    issuable to a customer and (iv) 1,600,000 shares of Common Stock issued in
    connection with the acquisition of Metis, LLC in August 1998, of which
    476,548 shares will be issued to certain employees pursuant to restricted
    stock purchase agreements subject to a lapsing right of repurchase, at the
    option of the Company, over the respective vesting periods. Includes
    2,451,786 shares to be sold in the Related Sale. In July and September 1998,
    the Company granted options to purchase Common Stock and issued shares of
    Common Stock pursuant to restricted stock purchase agreements equal to a
    total of 3,433,500 shares of Common Stock with a weighted-average exercise
    or purchase price of $5.44 per share. The Company estimates that it will
    record deferred compensation during the three months ending September 30,
    1998 of approximately $6.0 million with regard to these grants and
    issuances. See "Management -- Employee Benefit Plans," "Description of
    Capital Stock" and Notes 10, 11, 15 and 16 of Notes to Consolidated
    Financial Statements.
    
 
                                       19
<PAGE>
                                    DILUTION
 
   
    The net tangible book value of the Company as of June 30, 1998 was
approximately $13.5 million, or $.26 per share. "Net tangible book value" per
share is determined by dividing the net tangible book value of the Company
(total tangible assets less total liabilities) by the number of shares of Common
Stock at that date. Dilution per share represents the difference between the
amount per share paid by purchasers of shares of Common Stock in the offering
made by the Company hereby and the net tangible book value per share of Common
Stock immediately after completion of the Underwritten Offering and the Related
Sale. After giving effect to the sale of 7,287,500 shares of Common Stock
offered by the Company in the Underwritten Offering and to the sale of 2,451,786
shares of Common Stock in the Related Sale (at an assumed initial public
offering price of $7.00 per share and after deducting estimated underwriting
discounts and commissions and estimated offering expenses payable by the
Company) and the application of the estimated net proceeds therefrom, the
Company's net tangible book value at June 30, 1998 would have been $76.8
million, or $1.25 per share. This represents an immediate increase in pro forma
net tangible book value to existing stockholders of $.99 per share and an
immediate dilution to new investors of $5.75 per share. The following table
illustrates the per share dilution:
    
 
<TABLE>
<S>                                                                 <C>     <C>
Assumed initial public offering price per share...................          $ 7.00
  Net tangible book value per share as of June 30, 1998...........  $  .26
  Increase per share attributable to new investors................     .99
                                                                    ------
Net tangible book value per share after this offering.............            1.25
                                                                            ------
Dilution per share to new public investors........................          $ 5.75
                                                                            ------
                                                                            ------
</TABLE>
 
   
    The following table sets forth, on a pro forma basis, as of June 30, 1998,
the difference between the number of shares of Common Stock purchased from the
Company, the total consideration paid and the average price per share paid by
existing stockholders, by the investors in the Related Sale and by the new
investors (at an assumed initial public offering price of $7.00 per share and
before deducting estimated underwriting discounts and commissions and estimated
offering expenses payable by the Company):
    
 
   
<TABLE>
<CAPTION>
                                                SHARES PURCHASED           TOTAL CONSIDERATION        AVERAGE
                                            -------------------------  ---------------------------   PRICE PER
                                               NUMBER       PERCENT        AMOUNT        PERCENT       SHARE
                                            ------------  -----------  --------------  -----------  -----------
<S>                                         <C>           <C>          <C>             <C>          <C>
Existing stockholders.....................    51,704,947       84.1%   $  101,722,000       59.9%    $    1.97
New public investors......................     7,287,500       11.9        51,012,500       30.0          7.00
Related Sale Investor.....................     2,451,786        4.0        17,162,502       10.1          7.00
                                            ------------      -----    --------------      -----
  Total...................................    61,444,233      100.0%   $  169,897,000      100.0%
                                            ------------      -----    --------------      -----
                                            ------------      -----    --------------      -----
</TABLE>
    
 
    As of June 30, 1998, there were options outstanding to purchase a total of
8,997,995 shares of Common Stock, with a weighted average exercise price of
$1.17 per share, and warrants to purchase a total of 2,077,240 shares of Common
Stock, with a weighted average exercise price of $2.81 per share and 500,000
shares of Common Stock to be subject to a warrant with an exercise price of
$10.40 per share issuable to a customer. In July and September 1998, the Company
granted options to purchase Common Stock and issued shares of Common Stock
pursuant to restricted stock agreements equal to a total of 3,433,500 shares of
Common Stock, with a weighted average exercise or purchase price of $5.44 per
share. To the extent that any of the outstanding options or warrants are
exercised, there will be further dilution to new public investors. If all
outstanding options and warrants (through September 15, 1998) were exercised,
the dilution per share to new public investors would be $5.47.
 
    In addition, in August 1998, the Company issued 1,600,000 shares of Common
Stock in connection with the acquisition of Metis, LLC in August 1998, of which
476,548 shares will be issued to certain employees pursuant to restricted stock
purchase agreements subject to a lapsing right of repurchase, at the option of
the Company, over the respective vesting periods. This transaction will also
cause further dilution to new public investors. See "Capitalization,"
"Management -- Employee Benefit Plans," "Description of Capital Stock" and Notes
10, 11, 15 and 16 of Notes to Consolidated Financial Statements.
 
                                       20
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
    The following selected consolidated financial data should be read in
conjunction with "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and with the Consolidated Financial Statements and
Notes thereto, which are included elsewhere in this Prospectus. During the six
months ended June 30, 1998, Healtheon acquired ActaMed in a transaction
accounted for as a pooling of interests. All financial information has been
restated to reflect the combined operations of the Company and ActaMed. The
consolidated statements of operations data for the three-year period ended
December 31, 1997 and the six-month period ended June 30, 1998 and the
consolidated balance sheet data at December 31, 1996 and 1997 and June 30, 1998
are derived from, and are qualified by reference to, the audited Consolidated
Financial Statements included elsewhere in this Prospectus. The consolidated
statements of operations data for the two-year period ended December 31, 1994
and the consolidated balance sheet data at December 31, 1993, 1994 and 1995 are
derived from, and are qualified by reference to, audited Consolidated Financial
Statements that are not included in this Prospectus. The statements of
operations data for the six-month period ended June 30, 1997 are derived from
unaudited financial statements included elsewhere in this Prospectus and, in the
opinion of the Company, include all adjustments, consisting only of normal
recurring adjustments, which are necessary for a fair presentation of the
results of operations for this period. Historical operating results are not
necessarily indicative of results in the future, and the results for interim
periods are not necessarily indicative of the results that may be expected for
the entire year.
 
<TABLE>
<CAPTION>
                                                                                                              SIX MONTHS ENDED
                                                                YEARS ENDED DECEMBER 31,                          JUNE 30,
                                                ---------------------------------------------------------  ----------------------
                                                  1993       1994       1995        1996         1997         1997        1998
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
                                                                                 (RESTATED)   (RESTATED)   (RESTATED)
                                                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                             <C>        <C>        <C>        <C>          <C>          <C>          <C>
CONSOLIDATED STATEMENTS OF OPERATIONS DATA(1):
Revenue:
  Services....................................  $      --  $     190  $     458   $   1,795    $   4,301    $     656   $  10,893
  Services to related parties(2)..............         --         --         --       4,237        7,309        3,240       9,370
  Software licenses...........................         --         --      1,717       4,981        1,780          390         390
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
  Total revenue...............................         --        190      2,175      11,013       13,390        4,286      20,653
Operating costs and expenses:
  Cost of revenue:
    Cost of services..........................         --        507      1,573       1,648        4,011          598      10,770
    Cost of services to related parties.......         --         --         --       4,919        6,536        3,129       7,317
    Cost of software licenses.................         --         --        343         160           --           --          --
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
    Total cost of revenue.....................         --        507      1,916       6,727       10,547        3,727      18,087
  Development and engineering expense.........      1,002      1,863      2,446       8,596       12,986        6,409       8,332
  Sales, general and administrative expense...        769        938      1,749       9,042       11,031        4,723      12,123
  Amortization of intangible assets...........         --         --         --       3,189        4,249        2,124       3,938
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
  Total operating costs and expenses..........      1,771      3,308      6,111      27,554       38,813       16,983      42,480
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
Loss from operations..........................     (1,771)    (3,118)    (3,936)    (16,541)     (25,423)     (12,697)    (21,827)
Interest income...............................          5        172        208         539          611          254         637
Interest expense..............................       (117)       (57)        (6)        (56)        (323)        (128)       (251)
Dividends on ActaMed's convertible redeemable
  preferred stock.............................         --         --         --      (2,548)      (2,870)      (1,606)       (890)
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
Net loss......................................     (1,883)    (3,003)    (3,734)    (18,606)     (28,005)     (14,177)    (22,331)
Dividends on ActaMed's convertible redeemable
  preferred stock.............................         --       (423)      (724)         --           --           --          --
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
Net loss applicable to common stockholders....  $  (1,883) $  (3,426) $  (4,458)  $ (18,606)   $ (28,005)   $ (14,177)  $ (22,331)
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
                                                ---------  ---------  ---------  -----------  -----------  -----------  ---------
Basic and diluted net loss per common share...                        $    (.85)  $   (2.83)   $   (3.88)   $   (1.97)  $   (1.27)
Weighted-average shares outstanding used in
  computing basic and diluted net loss per
  common share(3).............................                            5,246       6,583        7,223        7,193      17,632
Pro forma basic and diluted net loss per
  common share (unaudited)....................                                                 $    (.56)               $    (.46)
Shares used in computing pro forma basic and
  diluted net loss per common share
  (unaudited)(3)..............................                                                    44,715                   46,631
</TABLE>
 
                                       21
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                 DECEMBER 31,
                                                           ---------------------------------------------------------
                                                                                                                      JUNE 30,
                                                             1993       1994       1995        1996         1997        1998
                                                           ---------  ---------  ---------  -----------  -----------  ---------
                                                                                            (RESTATED)   (RESTATED)
                                                                                (IN THOUSANDS)
<S>                                                        <C>        <C>        <C>        <C>          <C>          <C>
CONSOLIDATED BALANCE SHEET DATA(1):
Cash, cash equivalents and short-term investments........  $      74  $   4,186  $   9,386   $   7,539    $  21,804   $  12,801
Working capital (deficit)................................     (1,737)     4,226      7,244       2,505       14,790       2,560
Total assets.............................................        899      5,379     10,801      34,407       53,747      49,410
Long-term obligations, net of current portion............        159         63         --       1,210          932       1,459
Convertible redeemable preferred stock...................         --      7,919     16,029      39,578       50,948          --
Stockholders' equity (net capital deficiency)............     (1,335)    (2,838)    (7,697)    (14,553)      (9,930)     31,715
</TABLE>
 
- ----------
 
(1) The consolidated financial data reflects the business combination of
    Healtheon and ActaMed, which was accounted for as a pooling of interests.
    All statements of operations prior to the acquisition on May 19, 1998 have
    been restated to reflect the combined results of Healtheon and ActaMed from
    inception. The consolidated statements of operations and balance sheet data
    as of and for the years ended December 31, 1993, 1994 and 1995 are derived
    solely from the ActaMed statements of operations and balance sheets for such
    periods because Healtheon did not commence operations until January 1996.
    See Notes 1 and 2 of Notes to Consolidated Financial Statements for a
    discussion of the accounting for the acquisition of ActaMed. In previously
    issued financial statements of ActaMed for the year ended December 31, 1996,
    $5.2 million of the intangible assets acquired in the acquisition of EDI was
    written off as in process research and development. This amount has been
    reallocated to software technology rights and the related amounts in the
    consolidated financial statements have been restated as described in Note 14
    of the Notes to Consolidated Financial Statements.
 
(2) Revenue from services to related parties consists of revenue from United
    HealthCare and Smith Kline Labs, customers that are also significant
    stockholders of the Company.
 
(3) See Note 1 of Notes to Consolidated Financial Statements for an explanation
    of the determination of the shares used in computing basic and diluted net
    loss per common share.
 
                                       22
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
    THE FOLLOWING DISCUSSION SHOULD BE READ IN CONJUNCTION WITH THE CONSOLIDATED
FINANCIAL STATEMENTS AND NOTES THERETO INCLUDED ELSEWHERE IN THIS PROSPECTUS.
THE FOLLOWING DISCUSSION CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE RISKS
AND UNCERTAINTIES. THE COMPANY'S ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THE
RESULTS CONTEMPLATED BY THESE FORWARD-LOOKING STATEMENTS AS A RESULT OF CERTAIN
FACTORS, INCLUDING THOSE DISCUSSED BELOW AND ELSEWHERE IN THIS PROSPECTUS.
 
OVERVIEW
 
    Healtheon is pioneering the use of the Internet to simplify workflows,
decrease costs and improve the quality of patient care throughout the healthcare
industry. Healtheon's VHN Solution enables the secure exchange of information
among a wide array of disparate healthcare information systems and provides a
framework for a broad range of healthcare transactions.
 
    Healtheon was incorporated in December 1995, commenced operations in January
1996 and until late 1997 had not recognized substantial revenue and was
considered to be in the development stage. In May 1998, Healtheon acquired
ActaMed, which was incorporated in 1992. The acquisition of ActaMed was
accounted for as a pooling of interests. The financial information presented
reflects the combined financial position and operations of Healtheon and ActaMed
for all dates and periods presented. The Company's limited revenue to date has
been derived primarily from proprietary non-Internet network services offered by
ActaMed and from management and operation of customers' information technology
("IT") infrastructure. In March 1996, ActaMed acquired EDI Services, Inc.
("EDI"), a wholly owned subsidiary of United HealthCare, in a transaction
accounted for as a purchase. Accordingly, the operations of EDI are included in
the Company's consolidated statements of operations beginning in March 1996. In
August 1998, the Company acquired substantially all of the assets of Metis, LLC,
a leading consulting, design and development firm focused on Internet and
intranet-based solutions for medical centers and integrated delivery networks.
In connection with this acquisition, the Company issued 1,600,000 shares of its
Common Stock, of which 476,548 shares will be issued to certain employees
pursuant to restricted stock purchase agreements subject to a lapsing right of
repurchase, at the option of the Company, over the agreements' respective
vesting periods. Two hundred thousand shares are held in escrow to secure
certain indemnification obligations. The Asset Purchase was treated as a
tax-free reorganization within the meaning of Section 368(a) of the Internal
Revenue Code of 1986, as amended.
 
    The Company earns revenue from services and services to related parties,
which include providing access to its network-based services (including fixed
fee and transaction-based services) and performing development and consulting
services, and from licensing software. Revenue from services to related parties
consists of services provided to United HealthCare under a Services and License
Agreement between the Company and United HealthCare dated April 4, 1996 (the
"United HealthCare Agreement") and services provided to SmithKline Labs under a
Services Agreement between the Company and SmithKline Labs dated December 31,
1997 (the "Services Agreement"). Customers may purchase some or all of the
Company's applications and services and the customer relationship may evolve
from utilizing development and consulting services to utilizing transaction and
subscription-based services. The Company earns network-based services revenue
from fixed fee subscription arrangements, which revenue is recognized ratably
over the term of the applicable agreement, or revenue from arrangements that are
priced on a per-transaction or per-user basis, which revenue is recognized as
the services are performed. Revenue from development projects is recognized on a
percentage-of-completion basis or as such services are performed, depending on
the terms of the contract. Revenue from consulting services is recognized as
such services are performed. Cash received in excess of revenue recognized
relating to such services has been recorded as deferred revenue. As of June 30,
1998, the Company had deferred revenue of approximately $3.5 million.
 
                                       23
<PAGE>
    The United HealthCare Agreement has a five year term; however, the agreement
provides that two years after the date of the agreement (April 4, 1998) the
parties will agree on new prices that will be competitive with the marketplace.
The Company and United HealthCare are negotiating such new prices, and the
Company anticipates that the new prices will reduce the rates paid by United
HealthCare. The Services Agreement with SmithKline Labs also has a five year
term, but provides that the parties will negotiate new rates as of January 1,
2001 and each two year period thereafter. Pursuant to the Services Agreement,
the renegotiated rates must be competitive with the marketplace and must be no
higher than the lowest fees charged by the Company to similarly situated
customers.
 
    The Company recognizes software license revenue in accordance with the
American Institute of Certified Public Accountants' Statement of Position 97-2.
ActaMed entered into a national marketing and licensing agreement with
International Business Machines Corporation ("IBM") in 1995 that granted IBM a
nonexclusive, nontransferable right to market ActaMed's software and services
for a total of $6.3 million. For the years ended December 31, 1995, 1996 and
1997, approximately $1.7 million, $3.4 million and $1.2 million, respectively,
of this amount was recognized as software license revenue upon delivery of the
software. No software license revenue was recognized under this agreement for
the six months ended June 30, 1997 or 1998.
 
    In December 1996, the Company entered into a new agreement (the "License")
to license its newly granted patent to IBM. As part of the License, IBM agreed
to pay ActaMed $4.8 million over a four-year period, $1.0 million in December
1996 and the remaining balance in 48 equal monthly installments commencing in
January 1997. Additionally, in conjunction with the License, the Company issued
IBM a five-year warrant to purchase 282,522 shares of the Company's common stock
at a price of $7.97 per share. Because of the extended payment terms and the
Company's contentious relationship with IBM, the Company concluded that the
license fee was not assured of collection and, accordingly, is recognizing this
revenue as the proceeds are collected. For the years ended December 31, 1996 and
1997 and the six months ended June 30, 1997 and 1998, the Company recognized
revenue from the License of $1.0 million, $.8 million, $.4 million and $.4
million, respectively. At December 31, 1997, amounts due from IBM of $.7 million
and $1.7 million were included in accounts receivable and other assets,
respectively. At June 30, 1998, amounts due from IBM of $.8 million and $1.3
million were included in accounts receivable and other assets, respectively.
Deferred revenue at December 31, 1996 and 1997 and June 30, 1998 included $3.1
million, $2.3 million and $2.0 million, respectively, related to the License.
 
    The Company does not expect that it will earn a material amount of revenue
from sofware licenses in the foreseeable future.
 
    The Company has developed strategic relationships with healthcare industry
leaders, including United HealthCare, SmithKline Labs, Brown & Toland and Beech
Street. These four companies each accounted for over 10%, and together accounted
for over 90%, of the Company's total revenue for the six months ended June 30,
1998 and United HealthCare and SmithKline Labs accounted for all of the
Company's revenue from services to related parties. The Company expects that a
small number of customers will continue to account for a substantial portion of
the Company's revenue for the foreseeable future. The loss of one or more of the
Company's significant customers, or a decline in volume of business generated by
such customers, could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
    Cost of services and cost of services to related parties consist of costs
related to services the Company provides to customers and costs associated with
the operation and maintenance of Healtheon's networks. These costs include
salaries and related expenses for consulting and development personnel, network
operations personnel, customer support personnel, telecommunication costs,
depreciation and maintenance of network equipment, a portion of facilities
expenses and leased personnel and facilities costs. Cost of software licenses
consists primarily of expenses realted to royalties and sublicensing fees. Given
the Company's limited operating history, changes in revenue mix, limited history
of Internet-based
 
                                       24
<PAGE>
network services, recent investments in personnel, amortization of
infrastructure investments, and evolving business model, the Company believes
that analysis of historical cost of revenue as a percentage of revenue is not
meaningful. The Company anticipates that its total cost of revenue will increase
in absolute dollars in the future.
 
    Development and engineering expense (which excludes development expenses
that are included in cost of revenue) consists primarily of salaries and related
expenses associated with the development of applications and services and
includes compensation paid to engineering personnel, fees to outside contractors
and consultants, a portion of facilities expenses, and the depreciation and
amortization of capital equipment used in the development process. The Company
believes its success is partially dependent upon its ability to introduce new
applications in several healthcare markets in a relatively short period of time.
Accordingly, the Company intends to continue recruiting and hiring experienced
engineering personnel and to continue making other investments in development
and engineering. The Company expects that development and engineering expenses
will continue to increase in absolute dollars. Currently, all development and
engineering expenses are expensed as incurred.
 
    Sales, general and administrative expense consists primarily of salaries and
related expenses for sales, account management, marketing, administrative,
finance, legal, human resources and executive personnel, commissions, costs and
expenses for marketing programs and trade shows, fees for professional services,
and costs of accounting and internal control systems to support the operations
of the Company. The Company anticipates that sales, general and administrative
expense will continue to increase in absolute dollars as it adds sales,
marketing and administrative personnel, increases its marketing and promotional
activities, and incurs costs related to being a public company, such as
directors' and officers' liability insurance premiums and professional fees.
 
    In previously issued financial statements of ActaMed for the year ended
December 31, 1996, $5.2 million of the intangible assets acquired in the
acquisition of EDI was written off as in process research and development. This
amount has been reallocated to software technology rights and the related
amounts in the consolidated financial statements have been restated as described
in Note 14 of the Notes to Consolidated Financial Statements.
 
    The Company's business model is still in an emerging stage, and revenue and
income potential from the Company's business is unproven. Moreover, the
Company's limited operating history under its current business model makes an
evaluation of the Company and its prospects difficult; investors should not use
the Company's past results as a basis to predict future performance. The Company
has incurred net losses since inception and, as of June 30, 1998, had an
accumulated deficit of $71.7 million. The Company intends to continue investing
heavily in acquisitions, infrastructure development, application development and
sales and marketing. As a result, the Company expects to incur substantial
operating losses at least through 1999. There can be no assurance that the
Company will achieve significant revenue or profitability or, if significant
revenue or profitability are achieved, that they can be sustained. See "Risk
Factors -- Limited Operating History; Accumulated Deficit and Unproven Business
Model."
 
                                       25
<PAGE>
RESULTS OF OPERATIONS
 
    The following table sets forth certain data expressed as a percentage of
total revenue for the periods indicated.
 
<TABLE>
<CAPTION>
                                                                          Six Months Ended
                                         Year Ended December 31,              June 30,
                                     --------------------------------   --------------------
                                      1995       1996         1997         1997       1998
                                     -------  ----------   ----------   ----------   -------
                                              (RESTATED)   (RESTATED)   (RESTATED)
<S>                                  <C>      <C>          <C>          <C>          <C>
Revenue:
  Services.........................     21.1%     16.3%        32.1%        15.3%       52.7%
  Services to related parties(1)...       --      38.5         54.6         75.6        45.4
  Software licenses................     78.9      45.2         13.3          9.1         1.9
                                     -------  ----------   ----------   ----------   -------
  Total revenue....................    100.0     100.0        100.0        100.0       100.0
Operating costs and expenses:
  Cost of revenue:
    Cost of services...............     72.3      15.0         30.0         14.0        52.1
    Cost of services to related
      parties......................       --      44.7         48.8         73.0        35.4
    Cost of software licenses......     15.8       1.5           --           --          --
                                     -------  ----------   ----------   ----------   -------
    Total cost of revenue..........     88.1      61.2         78.8         87.0        87.5
  Development and engineering......    112.5      78.0         97.0        149.5        40.3
  Sales, general and
    administrative.................     80.4      82.1         82.4        110.2        58.7
  Amortization of intangible
    assets.........................       --      29.0         31.7         49.6        19.1
                                     -------  ----------   ----------   ----------   -------
  Total operating costs and
    expenses.......................    281.0     250.3        289.9        396.3       205.6
                                     -------  ----------   ----------   ----------   -------
Loss from operations...............   (181.0)   (150.3)      (189.9)      (296.3)     (105.6)
Interest income....................      9.6       4.9          4.6          5.9         3.1
Interest expense...................     (0.3)     (0.5)        (2.4)        (3.0)       (1.2)
Dividends on ActaMed's convertible
  redeemable preferred stock.......       --     (23.1)       (21.4)       (37.5)       (4.3)
                                     -------  ----------   ----------   ----------   -------
Net loss...........................   (171.7)   (169.0)      (209.1)      (330.9)     (108.0)
Dividends on ActaMed's convertible
  redeemable preferred stock.......    (33.3)       --           --           --          --
                                     -------  ----------   ----------   ----------   -------
Net loss applicable to common
  stockholders.....................   (205.0)%   (169.0)%    (209.1)%     (330.9)%    (108.0)%
                                     -------  ----------   ----------   ----------   -------
                                     -------  ----------   ----------   ----------   -------
</TABLE>
 
- ---------
 
(1) Revenue from services to related parties consists of revenue from United
    HealthCare and SmithKline Labs, customers that are also significant
    stockholders of the Company.
 
    SIX MONTHS ENDED JUNE 30, 1998 AND 1997
 
    REVENUE.  Total revenue increased to $20.7 million in the first six months
of 1998 from $4.3 million in the same period of 1997. Revenue from services
increased to $10.9 million in the first six months of 1998 from $.7 million in
the same period in 1997. The significant increase in revenue was due principally
to new contracts with Brown & Toland and Beech Street for the management and
operation of their IT infrastructure beginning in late 1997. To provide these
services, the Company utilizes its own personnel, certain outside contractors
and certain personnel and facilities of the customers that are leased to the
Company. The cost of these leased customer personnel and facilities are included
as part of the total costs of the IT and development services billed to the
customers by the Company. In the first six months of 1998, the Company
recognized revenue for IT services of $7.3 million, which included costs of
leased personnel
 
                                       26
<PAGE>
and facilities of $6.1 million. In addition, the Company recognized revenue of
approximately $2.5 million for development services in the same period.
 
    Revenue from services to related parties increased to $9.4 million in the
first six months of 1998 from $3.2 million in the same period of 1997 primarily
due to a new contract with SmithKline Labs in December 1997 to service its SCAN
laboratory test order and results service. Revenue from software licenses was
unchanged in the first six months of 1998 from the same period in 1997. The
Company expects that revenue from software licenses will continue to decline in
future periods as a percentage of total revenue.
 
    COST OF REVENUE.  Total cost of revenue increased to $18.1 million in the
first six months of 1998 from $3.7 million in the same period of 1997. Cost of
services increased to $10.8 million in the first six months of 1998 from $.6
million in the same period in 1997. This increase includes $6.1 million related
to costs of leased personnel and facilities utilized to provide IT services and
$2.5 million related to development services. The remainder of the increase
resulted from increased personnel to support the Brown & Toland and Beech Street
contracts. The Company had no cost of software licenses revenue in the first six
months of 1998 or in the comparable period of 1997.
 
    Cost of services to related parties increased to $7.3 million in the first
six months of 1998 from $3.1 million in the same period of 1997. This increase
resulted from higher personnel and network operations costs necessary to support
increased transactions from the Company's SCAN services.
 
    DEVELOPMENT AND ENGINEERING.  Development and engineering expense (which
excludes development expenses that are included in cost of revenue) increased to
$8.3 million in the first six months of 1998 from $6.4 million in the same
period of 1997. The increase in development and engineering expenses was caused
by a significant increase in the number of engineers engaged in the development
of the Company's applications and services.
 
    SALES, GENERAL AND ADMINISTRATIVE.  Sales, general and administrative
expense increased to $12.1 million in the first six months of 1998 from $4.7
million in the same period of 1997. The increase resulted primarily from the
addition of sales personnel and executive management (approximately $2.1 million
in salaries and $3.4 million in related support costs), approximately $.8
million of costs related to the merger with ActaMed and from the amortization of
deferred compensation. The Company recorded deferred compensation of $2.4
million during the first six months of 1998, and recorded $1.1 million of
amortization of deferred compensation in this period. In July 1998, the Company
recorded deferred compensation of approximately $6.0 million. Deferred
compensation represents the difference between the purchase or exercise price of
certain restricted stock and stock option grants and the deemed fair value of
the Company's Common Stock at the time of such grants. The remaining deferred
compensation will be amortized over the vesting period, generally four years, of
the respective option or restricted stock grants. Amortization is estimated to
total $3.1 million for the last six months of 1998, $4.0 million for 1999, $2.0
million for 2000, and $.6 million for 2001.
 
    AMORTIZATION OF INTANGIBLE ASSETS.  Amortization of intangible assets was
$3.9 million in the first six months of 1998 and $2.1 million in the same period
of 1997. This amortization relates to the acquisition of EDI in March 1996 from
United HealthCare and certain intangible assets related to SCAN acquired from
SmithKline Labs in December 1997. Although the Services and License Agreement
entered into with United HealthCare in connection with the acquisition of EDI
has a five year term, the Company determined that a three year amortization
period was appropriate for the EDI-related assets due to the price renegotiation
required by such agreement, the probability that the purchased technology and
software would be replaced within three years, and the uncertain profitability
of the agreement after the price renegotiation. Similarly, although the Services
Agreement entered into with SmithKline Labs in connection with the acquisition
of the SCAN-related assets has a five year term, the Company determined that a
three year amortization period was appropriate for the SCAN related assets due
to the price renegotiation required by such agreement, the probability that the
purchased technology and software
 
                                       27
<PAGE>
would be replaced within three years, and the uncertain profitability of the
agreement after the price renegotiation. There can be no assurance that the
Company's services to United HealthCare and SmithKline Labs will be profitable
after the price renegotiations required by the agreements, particularly given
the uncertainty of future rates and volumes under those agreements. At June 30,
1998, a total of $18.2 million remained to be amortized, and the amortization
charges for the six months ending December 31, 1998 and for the years ending
1999 and 2000 are estimated to be $6.1 million, $7.0 million and $5.1 million,
respectively, assuming no impairment of the remaining unamortized intangible
asset balances. The Company anticipates that it will incur additional
amortization of intangible assets in connection with its acquisition of Metis,
LLC. See Notes 2, 3 and 15 of Notes to Consolidated Financial Statements.
 
    INTEREST INCOME AND EXPENSE.  Interest income has been derived primarily
from cash investments, and increased to $.6 million in the first six months of
1998 compared to $.3 million in the same period of 1997. The increase resulted
from the Company's $25.0 million Preferred Stock financing in October 1997.
Interest expense results from the Company's borrowings and from capitalized
lease obligations for equipment purchases.
 
    DIVIDENDS ON ACTAMED'S CONVERTIBLE REDEEMABLE PREFERRED STOCK.  As dividends
on ActaMed's convertible redeemable preferred stock were cumulative whether
declared or not, the Company accrued such dividends on a quarterly basis.
Dividends of $1.6 million and $.9 million are shown as a charge against income
in the consolidated statement of operations for the first six months of 1997 and
1998, respectively. None of the dividends were paid, and, in conjunction with
approving the acquisition of ActaMed by the Company, the Preferred Stockholders
waived their right to receive such dividends, which totaled $7.5 million at the
time of the acquisition, and received an aggregate of 17,252,408 shares of
Healtheon Common Stock in exchange for their ActaMed Preferred Stock.
 
    INCOME TAXES.  At June 30, 1998, the Company had net operating loss
carryforwards for federal income tax purposes of $49.8 million and federal tax
credits of $1.0 million, both expiring from 2009 through 2013. Of these net
operating losses, $19.5 million relates to a consolidated subsidiary. This loss
carryforward is available only to offset future taxable income of that
subsidiary. Because of the "change of ownership" provisions of the Internal
Revenue Code, a portion of the Company's net operating loss carryforwards and
tax credit carryforwards may be subject to an annual limitation regarding their
utilization against taxable income in future periods. Thus, a portion of these
carryforwards may expire before becoming available to reduce future income tax
liabilities.
 
    YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
 
    REVENUE.  Total revenue increased to $13.4 million in 1997 from $11.0
million in 1996 and $2.2 million in 1995. Revenue from services increased to
$4.3 million in 1997 from $1.8 million in 1996 and $.5 million in 1995. The
increase is due primarily to the contract with Brown & Toland, which began in
October 1997. In 1997, the Company recognized $2.1 million of revenue for IT
services under this contract, which included costs of leased personnel and
facilities of $1.9 million.
 
    Revenue from services to related parties increased to $7.3 million in 1997
from $4.2 million in 1996. There was no revenue from services to related parties
in 1995. The Company's acquisition of ProviderLink in March 1996 from United
HealthCare accounts for substantially all of the related party revenue in 1996
and the 1997 increase is substantially due to recording a full year of revenue
in 1997 compared to nine months in 1996.
 
    Revenue from software licenses was $1.8 million, $5.0 million and $1.7
million in 1997, 1996 and 1995, respectively. Substantially all of this revenue
was derived from licensing agreements with IBM. The full amount of revenue to be
derived from one of these agreements had been recognized by the end of 1997.
Revenue will continue to be recognized under a second agreement through December
2000.
 
                                       28
<PAGE>
    COST OF REVENUE.  Cost of services was $4.0 million, $1.6 million and $1.6
million in 1997, 1996 and 1995, respectively. The increase from 1996 to 1997 was
primarily due to the $1.9 million cost related to the leased personnel and
facilities under the Brown & Toland contract. Cost of services to related
parties increased to $6.5 million in 1997 from $4.9 million in 1996. This
increase was primarily due to recording a full year of costs related to
ProviderLink in 1997 compared to only nine months in 1996. Cost of software
licenses in 1996 and 1995 related principally to royalties and sublicense fees
paid by the Company.
 
    DEVELOPMENT AND ENGINEERING.  Development and engineering expense (which
excludes development expenses that are included in cost of revenue) was $13.0
million in 1997 compared to $8.6 million in 1996 and $2.4 million in 1995. The
increase in development and engineering expense was caused by a significant
increase in the number of engineers engaged in the development of the Company's
applications and services.
 
    SALES, GENERAL AND ADMINISTRATIVE.  Sales, general and administrative
expense was $11.0 million in 1997, compared to $9.0 million in 1996 and
approximately $1.7 million in 1995. The increase resulted primarily from the
addition of sales personnel and executive management (related salaries increased
approximately $1.4 million in 1997 from 1996) and from the amortization of
deferred compensation. The Company recorded deferred compensation of $2.7
million during 1997 and recorded $.6 million of amortization of deferred
compensation in 1997.
 
    AMORTIZATION OF INTANGIBLE ASSETS.  Amortization of acquisition-related
costs including intangible assets was $4.2 million in 1997 and $3.2 million in
1996. This amortization relates to the acquisition of EDI in March 1996.
 
    INTEREST INCOME AND EXPENSE.  Interest income was derived from cash
investments following the Company's issuance of Preferred Stock and imputed
interest on payments due from IBM beginning in early 1997. Interest expense
increased in 1997 as a result of bridge financing and bank borrowings of the
Company and from capitalized lease obligations for equipment purchases.
 
                                       29
<PAGE>
QUARTERLY FINANCIAL RESULTS
 
    The following table presents the Company's operating results for each of the
six quarters in the period ended June 30, 1998, as well as such data expressed
as a percentage of the Company's total revenue for the periods indicated. The
information for each of these quarters is unaudited and has been prepared on the
same basis as the audited consolidated financial statements appearing elsewhere
in this Prospectus. In the opinion of management, all necessary adjustments
(consisting only of normal recurring adjustments) have been included to present
fairly the unaudited quarterly results. This data should be read in conjunction
with the Consolidated Financial Statements and the Notes thereto appearing
elsewhere in this Prospectus. These operating results are not indicative of the
results of any future period.
 
<TABLE>
<CAPTION>
                                                                             THREE MONTHS ENDED
                                               -------------------------------------------------------------------------------
                                                 MAR. 31,       JUNE 30,      SEPT. 30,       DEC. 31,     MAR. 31,   JUNE 30,
                                                   1997           1997           1997           1997         1998       1998
                                               ------------   ------------   ------------   ------------   --------   --------
                                                (RESTATED)     (RESTATED)     (RESTATED)     (RESTATED)
                                                                               (IN THOUSANDS)
<S>                                            <C>            <C>            <C>            <C>            <C>        <C>
CONSOLIDATED STATEMENTS OF OPERATIONS DATA:
Revenue:
  Services...................................  $       239    $       417    $       560    $     3,085    $ 4,903    $  5,990
  Services to related parties................        1,488          1,752          1,959          2,110      4,656       4,714
  Software licenses..........................          195            195            195          1,195        195         195
                                               ------------   ------------   ------------   ------------   --------   --------
  Total revenue..............................        1,922          2,364          2,714          6,390      9,754      10,899
Operating costs and expenses:
  Cost of revenue:
    Cost of services.........................          213            385            482          2,931      5,088       5,682
    Cost of services to related parties......        1,633          1,496          1,519          1,888      2,860       4,457
    Cost of software licenses................           --             --             --             --         --          --
                                               ------------   ------------   ------------   ------------   --------   --------
    Total cost of revenue....................        1,846          1,881          2,001          4,819      7,948      10,139
  Development and engineering................        3,247          3,162          3,272          3,305      3,919       4,413
  Sales, general and administrative..........        2,501          2,222          2,754          3,554      4,966       7,157
  Amortization of intangible assets..........        1,062          1,062          1,063          1,062      1,949       1,989
                                               ------------   ------------   ------------   ------------   --------   --------
  Total operating costs and expenses.........        8,656          8,327          9,090         12,740     18,782      23,698
                                               ------------   ------------   ------------   ------------   --------   --------
Loss from operations.........................       (6,734)        (5,963)        (6,376)        (6,350)    (9,028)    (12,799)
Interest income..............................          146            108            105            252        358         279
Interest expense.............................          (50)           (78)           (49)          (146)      (116)       (135)
Dividends on ActaMed's convertible redeemable
  preferred stock............................         (783)          (823)          (776)          (488)      (890)         --
                                               ------------   ------------   ------------   ------------   --------   --------
Net loss.....................................  $    (7,421)   $    (6,756)   $    (7,096)   $    (6,732)   $(9,676)   $(12,655)
                                               ------------   ------------   ------------   ------------   --------   --------
                                               ------------   ------------   ------------   ------------   --------   --------
AS A PERCENTAGE OF REVENUE:
Revenue:
  Services...................................         12.4%          17.6%          20.6%          48.3%      50.3%       55.0%
  Services to related parties................         77.4           74.1           72.2           33.0       47.7        43.3
  Software licenses..........................         10.2            8.3            7.2           18.7        2.0         1.7
                                               ------------   ------------   ------------   ------------   --------   --------
  Total revenue..............................        100.0          100.0          100.0          100.0      100.0       100.0
Operating costs and expenses:
  Cost of revenue:
    Cost of services.........................         11.1           16.3           17.8           45.9       52.2        52.1
    Cost of services to related parties......         85.0           63.3           56.0           29.5       29.3        40.9
    Cost of software licenses................           --             --             --             --         --          --
                                               ------------   ------------   ------------   ------------   --------   --------
    Total cost of revenue....................         96.1           79.6           73.8           75.4       81.5        93.0
  Development and engineering................        168.9          133.7          120.6           51.7       40.2        40.5
  Sales, general and administrative..........        130.1           94.0          101.5           55.6       50.9        65.7
  Amortization of intangible assets..........         55.3           44.9           39.2           16.6       20.0        18.2
                                               ------------   ------------   ------------   ------------   --------   --------
  Total operating costs and expenses.........        450.4          352.2          335.1          199.3      192.6       217.4
                                               ------------   ------------   ------------   ------------   --------   --------
Loss from operations.........................       (350.4)        (252.2)        (235.1)         (99.3)     (92.6)     (117.4)
Interest income..............................          7.6            4.6            3.9            3.9        3.7         2.6
Interest expense.............................         (2.6)          (3.3)          (1.8)          (2.3)      (1.2)       (1.2)
Dividends on ActaMed's convertible redeemable
  preferred stock............................        (40.7)         (34.8)         (28.6)          (7.6)      (9.1)         --
                                               ------------   ------------   ------------   ------------   --------   --------
Net loss.....................................       (386.1)%       (285.7)%       (261.6)%       (105.3)%    (99.2)%    (116.0)%
                                               ------------   ------------   ------------   ------------   --------   --------
                                               ------------   ------------   ------------   ------------   --------   --------
</TABLE>
 
                                       30
<PAGE>
    Revenue has grown each quarter as demand for the Company's services has
increased. Cost of revenue increased in the quarter ended December 31, 1997 due
primarily to expenses related to the Brown & Toland contract, and in the
quarters ended March 31, 1998 and June 30, 1998 due primarily to expenses
related to the Beech Street and SmithKline Labs contracts. In addition, in the
quarter ended June 30, 1998, total cost of revenue increased due in part to an
increase in amortization of capitalized internally developed software. This
increase was due to the fact that the Company evaluated the carrying value of
the capitalized internally developed software in light of the changes in
operations resulting from the acquisition of ActaMed by Healtheon. The Company
determined that it expected no future cash flows to be generated by this
software and, accordingly, wrote off the remaining unamortized balance of $.6
million. Development and engineering expense increased in the quarters ended
March 31 and June 30, 1998 due to a significant increase in personnel engaged in
the development of the Company's applications and services. Sales, general and
administrative expenses increased in each of the quarters ended September 30,
1997 through June 30, 1998 due to increases in sales and executive personnel and
due to amortization of deferred compensation. In addition, the Company recorded
substantial professional fees related to the acquisition of ActaMed in the
quarter ended June 30, 1998.
 
    The Company's quarterly revenue and operating results have varied in the
past and are likely to vary substantially in the future. The Company intends to
increase its marketing, sales, development and engineering, and administrative
activities and to increase other operating expenses as required to integrate the
operations, technologies and networks of recent and any future acquisitions and
expand its healthcare network infrastructure and operations. It is anticipated
that these expenses could significantly precede any revenue generated by such
increased spending. If the Company does not experience significantly increased
revenue from these efforts, the Company's business, financial condition and
results of operations could be materially and adversely affected. In addition,
the Company's expense levels are based in part on its expectations concerning
future revenue and are relatively fixed in the short-term. Consequently, if the
Company's revenue is below expectations in any period, the Company may not be
able to adjust its spending levels in a timely manner.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    The Company has funded its operations since inception primarily through the
private placement of equity securities, through which it had raised net proceeds
of $59.6 million through June 30, 1998. The Company has also financed its
operations through equipment lease financing and bank borrowings. As of June 30,
1998, the Company had outstanding equipment lease financing and bank borrowings
of $6.5 million. As of June 30, 1998, the Company had approximately $12.8
million of cash, cash equivalents and short-term investments.
 
    Cash used in operating activities was $1.3 million in 1995, $9.6 million in
1996 and $16.4 million in 1997. The cash used during these periods was primarily
attributable to net losses of $3.7 million, $18.6 million and $28.0 million in
1995, 1996, 1997, respectively, offset in part by depreciation and amortization,
and dividends on ActaMed's Convertible Redeemable Preferred Stock. These losses
were principally related to increased development and engineering expenses and
sales, general and administrative expenses. Cash used in operations in the first
six months of 1998 was $9.1 million, reflecting a net loss partially offset by
depreciation and amortization expenses.
 
    Investments in property and equipment (excluding equipment acquired under
capital leases) and internally developed software were $.5 million, $3.0
million, $3.1 million and $2.7 million in 1995, 1996 and 1997, and the first six
months of 1998, respectively. In 1997, the Company used $5.3 million of cash to
purchase short-term investments. During the first six months of 1998, the
Company purchased an additional $3.5 million of short-term investments and
realized $7.1 million in cash from maturities of its short-term investments. The
Company had no purchases or maturities of short-term investments in 1995, 1996,
or the six months ended June 30, 1997.
 
                                       31
<PAGE>
    Cash provided by financing activities was $7.0 million, $11.1 million and
$34.6 million in 1995, 1996 and 1997, respectively, resulting primarily from net
proceeds from the sale of Preferred Stock and, to a lesser extent, from a bank
line and bridge note financing in 1997. Cash provided by financing activities
for the first six months of 1998 was $2.8 million, primarily from the net
proceeds from the sale of Preferred and Common Stock, partially offset by
payments on capital lease obligations.
 
    As of June 30, 1998, the Company did not have any material commitments for
capital expenditures. The Company's principal commitments at June 30, 1998
consisted of obligations under operating leases and capital leases of $13.3
million and $3.4 million, respectively. See Note 6 of Notes to Consolidated
Financial Statements.
 
   
    The Company currently anticipates that the net proceeds from the
Underwritten Offering and the Related Sale, together with its available cash
resources and credit facilities, will be sufficient to meet its presently
anticipated working capital, capital expenditure and business expansion
requirements for at least the next 12 months. However, the Company may need to
raise additional funds prior to such time to support expansion, develop new or
enhanced applications and services, respond to competitive pressures, acquire
complementary businesses or technologies or take advantage of unanticipated
opportunities. The Company's future liquidity and capital requirements will
depend upon numerous factors, including the success of the Company's existing
and new application and service offerings and competing technological and market
developments. The Company may be required to raise additional funds through
public or private financing, strategic relationships or other arrangements.
There can be no assurance that such additional funding, if needed, will be
available on terms acceptable to the Company, or at all.
    
 
YEAR 2000 COMPLIANCE
 
    Many currently installed computer systems and software products are unable
to distinguish between twentieth century dates and twenty-first century dates.
As a result, many companies' software and computer systems may need to be
upgraded or replaced to comply with such "Year 2000" requirements. The Company's
business is dependent on the operation of numerous systems that could
potentially be impacted by Year 2000 related problems. Those systems include,
among others: hardware and software systems used by the Company to deliver
services to its customers (including the Company's proprietary software systems
as well as hardware and software supplied by third parties); communications
networks, such as the Internet and private intranets, which the Company depends
on to provide electronic transactions to its customers; the internal systems of
the Company's customers and suppliers; the hardware and software systems used
internally by the Company in the management of its business; and non-information
technology systems and services used by the Company in its business, such as
telephone systems and building systems.
 
    The Company has internally reviewed the proprietary software systems it uses
to deliver services to its customers. Although the Company believes that its
internally developed applications and systems are designed to be Year 2000
compliant, the Company utilizes third-party equipment and software that may not
be Year 2000 compliant. Also, two systems acquired by ActaMed, specifically SCAN
and ProviderLink, which together accounted for approximately 47% of the
Company's total revenue in the first six months of 1998, will require
modifications to become Year 2000 compliant. The Company plans to release Year
2000 upgrades to these systems in late 1998 or early 1999. The Company estimates
the cost of these Year 2000 upgrades to be less than $1.0 million. In addition,
the Company's SCAN product is installed on approximately 4,400 Company-owned
workstations located in provider offices. Many of these workstations are not
Year 2000 compliant and must be upgraded or replaced by the Company. The Company
expects the costs of such upgrades or replacements to be less than $1.0 million.
However, the Company could experience delays and cost overruns in the
development of these upgrades, such upgrades could contain defects and the
Company could experience difficulties in getting the Company's installed base of
physicians to implement these upgrades in a timely manner. If the Company
experiences these or other difficulties in developing and deploying its Year
2000 upgrades, revenues from SCAN and ProviderLink
 
                                       32
<PAGE>
could be significantly reduced, which could have a material adverse effect on
the Company's business, financial condition and results of operations. Failure
of such third-party or Healtheon equipment or software to operate properly with
regard to the Year 2000 and thereafter could require the Company to incur
unanticipated expenses to remedy any problems, which could have a material
adverse effect on the Company's business, financial condition and results of
operations. In certain of its agreements, the Company warrants that its
applications and services are Year 2000 compliant. Failure of the Company's
applications and services to be Year 2000 compliant could result in the
termination of these agreements or in liability for damages, either of which
could have a material adverse effect on the Company's business, financial
condition and results of operations. The Company does not believe that its
expenditures to upgrade its internal systems and applications will have a
material adverse effect on its business, financial condition and results of
operations.
 
    Furthermore, the success of the Company's efforts may depend on the success
of other healthcare participants in dealing with their Year 2000 issues. Many of
these organizations are not Year 2000 compliant, and the impact of widespread
customer failure on the Company's systems is difficult to determine. Customer
difficulties due to Year 2000 issues could interfere with healthcare
transactions or information, which might expose the Company to significant
potential liability. If client failures result in the failure of Healtheon
systems, the Company's business, financial condition and results of operations
would be materially adversely affected. Furthermore, the purchasing patterns of
these customers or potential customers may be affected by Year 2000 issues as
companies expend significant resources to become Year 2000 compliant. The costs
of becoming Year 2000 compliant for current or potential customers may result in
reduced funds being available to purchase and implement the Company's
applications and services.
 
    The Company, with the assistance of an independent consulting firm
specializing in Year 2000 issues, is conducting a formal assessment of its Year
2000 exposure in order to determine what steps beyond those identified by the
Company's internal review may be advisable. The Company expects to complete such
assessment in the fourth quarter of 1998. The Company does not presently have a
contingency plan for handling Year 2000 problems that are not detected and
corrected prior to their occurrence. Any failure of the Company to address any
unforeseen Year 2000 issue could adversely affect the Company's business,
financial condition and results of operations.
 
RECENT ACCOUNTING PRONOUNCEMENTS
 
    In June 1997, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards ("SFAS") No. 131, "Disclosures about
Segments of an Enterprise and Related Information." The Company is required to
adopt SFAS No. 131 for the year ending December 31, 1998. SFAS No. 131 requires
disclosure of certain information regarding operating segments, products and
services, geographic areas of operation and major customers. Adoption of SFAS
No. 131 is expected to have no material impact on the Company's business,
financial condition or results of operations.
 
    In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities." The Company is required to adopt SFAS No.
133 for the year ending December 31, 2000. SFAS No. 133 establishes methods of
accounting for derivative financial instruments and hedging activities related
to those instruments as well as other hedging activities. Because the Company
currently holds no derivative financial instruments and does not currently
engage in hedging activities, adoption of SFAS No. 133 is expected to have no
material impact on the Company's business, financial condition or results of
operations.
 
                                       33
<PAGE>
                                    BUSINESS
 
INDUSTRY BACKGROUND
 
    GROWTH OF INTERNET COMMERCE AND FUNCTIONALITY
 
    The Internet's open architecture, universal accessibility and growing
acceptance make it an increasingly important environment for
business-to-business and business-to-consumer interaction. Use of the Internet
is rapidly expanding from simple information publishing, messaging, and data
gathering to critical business transactions and confidential communications. For
many industries, the Internet is connecting previously disconnected business
processes and allowing companies to automate workflows, lower distribution costs
and extend their market reach. The Company believes the healthcare industry,
because of its size, fragmentation and extreme dependence on information
exchange, is particularly well suited to benefit from greater use of the
Internet.
 
    NEED FOR REDUCED HEALTHCARE COSTS AND IMPROVED QUALITY OF CARE
 
    According to the Health Insurance Association of America, healthcare is the
largest single sector of the U.S. economy, consuming approximately $1 trillion
annually, or 14% of the country's gross domestic product. The healthcare
industry consists of a complex mix of participants, which includes physicians,
medical practice groups, hospitals and other organizations that deliver medical
care, referred to as "providers;" the government agencies, insurance companies,
managed care organizations and other enterprises that pay the bills for
healthcare, referred to as "payors;" clinical laboratories, pharmaceutical
companies, and other groups that provide tests, drugs, x-rays and other
services, referred to as "suppliers;" and, finally, individual patients who
receive medical care, and the government agencies, employers and other
organizations that represent groups of individuals, all referred to as
"consumers."
 
    All healthcare participants rely heavily upon information to perform their
roles in the industry. Individuals compare medical plans, choose physicians and
submit claims for reimbursement. Employers select health plans, determine
benefit levels, enroll employees and maintain employee eligibility data.
Providers verify patient eligibility, collect patient histories, order
diagnostic tests and x-rays, receive and interpret test results, render
diagnoses, make referrals and submit claims to payors. Payors manage referrals,
establish medical care protocols and reimbursement policies and process claims.
Suppliers analyze and process patient samples or tests, provide results, fill
prescriptions and submit claims for reimbursement. These and many other
healthcare transactions are also highly dependent on information, and each
participant is dependent on the others for parts of that information. In sum,
the finance and delivery of healthcare requires that consistent, accurate
information be shared confidentially across a large and fragmented industry.
 
    Inefficiencies within the healthcare system consume enormous amounts of
time, resources and dollars. It is estimated that over $250 billion (or 25% of
every healthcare dollar) are wasted through the delivery of unnecessary care,
performance of redundant tests and procedures, and excessive administrative
costs. The Company believes much of this inefficiency and waste is a direct
result of poor information exchange among healthcare participants. Consumers do
not have easy access to the detailed information they need to compare health
plans, select physicians, or manage their own healthcare and benefits. Providers
often lack timely access to relevant patient information, and this lack of
information causes them to prescribe unnecessary tests or procedures and hinders
their ability to diagnose and treat patients. Providers and suppliers often rely
on manual processes to share data, and errors and information bottlenecks
resulting from these manual processes cause delays in determining eligibility,
approving referrals, reporting test results and paying claims. These
inefficiencies contribute to the rising cost of healthcare. As a result, the
government and other purchasers of healthcare have increasingly placed pressure
on the healthcare industry to improve the cost-effectiveness of healthcare while
maintaining the quality of care.
 
                                       34
<PAGE>
    LIMITATIONS OF TRADITIONAL FUNCTIONAL APPROACH TO HEALTHCARE INFORMATION
     MANAGEMENT
 
    The unique characteristics of the healthcare industry have limited the scope
of previous technology solutions. The sheer number of participants, the
complexity of healthcare transactions, and pervasive concerns about
confidentiality have precluded any comprehensive solution that would deliver
connectivity and automated workflows across the entire industry. Healthcare
organizations and their traditional technology vendors have focused on
automating discrete business processes, such as billing and scheduling for
physicians, or claims processing for hospitals and payors. As a result, the
industry currently uses thousands of different mainframe and client/server
systems that lack cross-platform compatibility. While these legacy systems serve
the narrow functions for which they were designed, they have compounded the
industry's connectivity problems. Information the industry needs to share is
trapped in isolated, proprietary databases using non-standardized data formats.
In this environment, many physician offices, particularly those with limited
financial resources, have been reluctant to invest in information technology
solutions. Current solutions may provide connectivity to a single payor or
supplier, or to a limited subset of payors or suppliers, leaving the physician
office with its old manual processes for the majority of its transactions. The
following examples illustrate how poor information management and the lack of
connectivity result in costly, inefficient healthcare services:
 
    ENROLLMENT AND ELIGIBILITY.  The enrollment process typically begins with
employees choosing a health plan and completing paper forms; the employer
manually enters the employee information into its human resources information
system and subsequently sends the data (often via a paper report) to the
relevant health plan. The plan manually enters the information into its
membership system and sends the information, again often in paper form, to other
entities, such as provider groups, pharmacies, pharmacy benefit management
companies and diagnostic laboratories, which in turn must manually enter this
information into their own systems. By the time this process is complete, the
information may be months old and contain data entry errors, and the disparate
healthcare information systems of the various participants may contain
conflicting information about the same member. The participants must then expend
costly, time-consuming extra effort to correct these errors manually. In the
interim, patients may be denied treatment or providers may go unpaid for their
services.
 
    REFERRALS AND AUTHORIZATIONS.  Managed care organizations may require
physicians to obtain prior approval to refer patients to specialists or to
render certain treatments. The approval process often requires physicians to
mail, fax or telephone requests for authorization to the health plan. The plan
manually enters the data into its own system, checks its guidelines regarding
conditions of referral (which can involve multiple parties in different
organizations), and replies via mail, fax or telephone with an approval or
denial, a process that can take two days to a week or more. Next, the patient
must schedule an appointment if the request is approved, or seek alternative
care if the request is denied. This lengthy authorization process is costly,
wastes valuable physician time and delays patient care.
 
    CLINICAL INFORMATION EXCHANGE.  To diagnose and treat a patient properly,
physicians need access to clinical information, such as medical history data,
laboratory and x-ray results, and medication lists. However, this information
typically resides in proprietary databases or is stored in paper form.
Therefore, the physician must submit requests for information by phone or fax to
various hospitals, laboratories, outpatient diagnostic centers or provider
offices. Even when the data are stored at the physician's office, it can be
time-consuming to locate in the physician's paper-based medical record system.
As a result, significant delays can occur before the physician obtains the
information required to diagnose the patient's condition accurately. Often,
physicians will require patients to repeat tests for which data are missing,
leading to unnecessary expense. More important, the lack of timely access to
accurate clinical information in an urgent care situation may lead to inaccurate
diagnoses resulting in delayed or inappropriate care. The problem is therefore
not only costly, but also potentially harmful.
 
    The limitations and inefficiencies of traditional healthcare information
management ultimately harm the individual consumer. Individual consumers have
little control or influence over how healthcare services
 
                                       35
<PAGE>
are provided, in part because they lack easy access to information. It can be
difficult for consumers to perform simple tasks, such as changing primary care
providers, gaining access to their own medical records, or monitoring their own
care and compliance at home, because the information they need for these simple
tasks requires time-consuming phone calls or paper correspondence. Consumers,
frustrated by burdensome bureaucracy and lack of empowerment, often fail to take
ownership and control of their own treatment and recovery. The result is higher
costs of care and growing dissatisfaction with the healthcare experience.
 
    HEALTHEON'S OPPORTUNITY
 
    Healtheon believes a significant opportunity exists to leverage the power of
the Internet to provide secure, open, universally accessible network services
that connect participants and automate workflows throughout the healthcare
delivery process. The Company believes that such a solution has the potential to
create significant improvements in the way that information is used by the
healthcare system, enabling improved workflows, better decision-making and,
ultimately, higher quality care at a lower cost.
 
THE HEALTHEON VIRTUAL HEALTHCARE NETWORK
 
    Healtheon is pioneering the use of the Internet to simplify workflows,
decrease costs and improve the quality of patient care throughout the healthcare
industry. Healtheon has designed an Internet-based information and transaction
platform that allows it to create Virtual Healthcare Networks that facilitate
and streamline interactions among the myriad participants in the healthcare
industry. The Healtheon VHN solution includes a suite of services delivered
through applications operating on its Internet-based platform. Healtheon VHNs
enable the secure exchange of information among disparate healthcare information
systems and support a broad range of healthcare transactions, including
enrollment, eligibility determination, referrals and authorizations, laboratory
and diagnostic test ordering, clinical data retrieval and claims processing.
Healtheon provides its own applications on the Healtheon Platform and also
enables third-party applications to operate on its platform. The Healtheon
Virtual Healthcare Network solution provides the following key benefits:
 
    ELIMINATION OF UNNECESSARY OR REDUNDANT EFFORTS.  The Healtheon VHN solution
is designed to reduce paper-based transactions, eliminate redundant data entry,
shorten cycle times and decrease the communication inefficiencies created by
isolated proprietary systems. Healtheon believes that by decreasing redundant
tasks, errors, delays, and unnecessary tests and procedures, it can create
efficiencies and reduce costs across the healthcare industry.
 
    EXTENDIBILITY ACROSS THE CONTINUUM OF HEALTHCARE.  The Company leverages the
Internet to provide an open, low-cost information and transaction platform
capable of extending across a wide range of healthcare market segments. The
Healtheon VHN solution is designed to interconnect a broad range of practice
management, managed care, human resources and laboratory information systems.
The Company expects the benefits of its solution to increase as it adds
customers, enabling each user to exchange more data and complete more
transactions with a greater number and broader range of other healthcare
industry participants.
 
    SCALABILITY AND FLEXIBILITY.  The Healtheon VHN solution is designed to
support the Company's customers as their businesses grow and evolve. The
Healtheon Platform is designed to scale to accommodate high volumes of
transactions and large numbers of simultaneous users. In addition, Healtheon's
object-oriented platform provides flexibility so that customers can add or
modify applications and transaction capabilities to react to changes in the
healthcare marketplace.
 
    HIGH DEGREE OF SECURITY.  To enable the use of the Internet for transmission
of highly sensitive and confidential data, Healtheon utilizes advanced
technology designed to ensure a high degree of security. This technology
includes strict authentication requirements, sophisticated data encryption
techniques,
 
                                       36
<PAGE>
system-wide network security monitoring and tightly controlled physical security
systems. These safeguards are designed to provide a secure environment for the
exchange of confidential patient and customer data. The Healtheon Platform is
designed to enable compliance with proposed government standards under the
Health Insurance Portability and Accountability Act of 1996, which mandate the
acceptance by payors of electronic transactions as well as the use of standard
transactions, standard identifiers and security features by the year 2000.
 
    INCREASED ACCURACY AND TIMELINESS OF INFORMATION.  The Healtheon VHN
solution is designed to increase information flows among all healthcare
participants, which ultimately results in more timely and appropriate
treatments. For example, on-line access to accurate, up-to-date eligibility
information facilitates patients' access to care on a more timely basis, reduces
frustration and costs and increases the likelihood that providers will be
compensated for their services in a timely manner. Similarly, using Healtheon's
VHN solution, consumers will have greater access to their healthcare
information, thereby enabling them to become more active participants in the
provision of their own healthcare.
 
    Healtheon believes that these and other benefits provided by its solution
will result in increased quality of care.
 
STRATEGY
 
    Healtheon's objective is to become the leading provider of Internet-based
transaction and information services to the healthcare industry. The Company's
strategy includes the following key elements:
 
    LEVERAGE INTERNET TECHNOLOGY.  Healtheon leverages Internet technology to
create Virtual Healthcare Networks that provide secure transactions and
communications among a broad range of healthcare participants, regardless of
their legacy computing platforms. Unlike traditional proprietary solutions that
focus on point-to-point communications and narrowly defined transactions,
Internet technology allows the Company to integrate all categories of healthcare
participants--payors, providers, suppliers and consumers--to eliminate redundant
tasks and reduce costs. The Company believes that such connectivity will
optimize and simplify the flow of mission-critical information.
 
    EXPAND FUNCTIONALITY AND TRANSACTION CAPABILITY.  The Company seeks to
identify key functions that are critical to particular industry participants and
integrate applications supporting these functions into its VHN. The Company
plans to accomplish this by building native, Internet-based applications
encompassing the identified functionality, by acquiring businesses or
technologies, and by enabling industry-leading, third-party applications on its
platform. The Company has initially targeted those applications that are most
critical to each business segment of the healthcare industry, offer the highest
value to the participants, and are readily adaptable to a network computing
paradigm. For example, the Company developed its Benefits Administration
application suite to automate healthcare plan enrollment and is developing its
RACER application suite to manage eligibility, referrals, authorizations and
claims transactions between healthcare providers and payors.
 
    FORM STRATEGIC RELATIONSHIPS WITH LEADING HEALTHCARE PARTICIPANTS.  The
Company is aggressively pursuing strategic relationships with leaders in key
healthcare industry segments to increase its portfolio of applications and
services, increase the number of connected users and provide specialized
industry expertise for new applications. In addition, the Company plans to
acquire companies with strategic relationships with leading healthcare industry
participants. The Company believes this strategy also provides accelerated
market awareness and demand for Healtheon's services through the influence of
these partners both directly, through their use and sales efforts, and
indirectly, through their relationships with other potential customers. To date,
Healtheon has established strategic relationships with the following
organizations: United HealthCare, the largest health maintenance organization in
the United States; SmithKline Labs, one of the largest independent clinical
laboratory companies in the United States;
 
                                       37
<PAGE>
Brown & Toland, a leading medical group in the San Francisco Bay Area; and Beech
Street, one of the largest preferred provider organizations in the United
States.
 
    ESTABLISH A NATIONAL PRESENCE REGION BY REGION.  The Company believes that
the value of its applications and services will grow as the number of connected
parties and the breadth of the transactions conducted on the Company's platform
increase. However, healthcare remains highly regional, driven by business
relationships and practices that are often unique to specific regions.
Therefore, the Company's approach is to target regional markets where it can
gain critical mass and to expand nationally region by region. The Company plans
to enter into, and to acquire companies with, strategic relationships with
national and regional healthcare participants that have significant market share
in specific regions. In addition, the Company intends to leverage its existing
relationships to penetrate new regions and markets.
 
    PURSUE USAGE-BASED BUSINESS MODEL.  The Company offers network-based
transaction and information services on a transaction or subscription fee basis.
This pricing model reduces the initial investment required to obtain the
benefits of high-end information technology systems, enabling physicians, small
organizations and individuals to gain access to such systems for the first time.
By enabling the shift from fixed information technology costs to variable costs,
the Company believes that it will be able to achieve a critical mass of users
and broad-based adoption of the Healtheon Virtual Healthcare Network solution.
 
    PROVIDE A COMPLETE SOLUTION.  In addition to its network-based transaction
and information services, the Company offers consulting, application
development, systems integration and network management services to provide
complete customer-specific solutions. By offering this range of services, the
Company can provide customers with a complete migration path from the customers'
legacy systems and processes to Healtheon's Internet-based model.
 
HEALTHEON'S SERVICES
 
    Healtheon offers a suite of healthcare transaction and information services
delivered over the Internet or over private intranets and other networks. These
network-based services are provided by software applications operating on or
interfacing with the Healtheon Platform, which is designed to provide
connectivity across the healthcare industry and enable a broad array of secure,
mission-critical healthcare transactions. In addition to its platform and
Internet-based applications, Healtheon provides comprehensive consulting and
implementation services to enable its customers to take full advantage of the
capabilities of Healtheon's platform.
 
                                       38
<PAGE>
    Healtheon provides a broad range of applications and services that support
key healthcare transactions. The components of these application suites can be
combined and modified, or supplemented with new application components, to
provide custom solutions for large, complex, multi-entity business enterprises.
These applications and services are typically sold on a transaction or
subscription fee basis, which varies across customers and market segments. The
following chart summarizes the key transactions supported by Healtheon,
organized by business function.
 
<TABLE>
<CAPTION>
         BUSINESS           CUSTOMERS/
         FUNCTION              USERS            TRANSACTIONS SUPPORTED          APPLICATIONS
<S>                         <C>          <C>                                    <C>
Membership Services          Consumers   - Enrollment                           Benefits
                                Payors   - Plan comparison/selection            Administration
                                         - Provider search, selection, change
                                         - Benefits inquiry
                                         - Messaging
Healthcare Administration       Payors   - Eligibility determination            ProviderLink
  and Financial Management   Providers   - Referrals*                           RACER*
                                         - Authorization*                       PACER*
                                         - Claims submission and status
                                         - Remittance advice
                                         - Provider directories*
                                         - Provider files-management*
                                         - Reporting
                                         - Claims repricing*
Clinical Information         Providers   - Patient identification and           SCAN+
  Services                   Suppliers   encounter history                      GMPI+
                                         - Patient registration                 ActaLab*
                                         - Lab orders and results
                                         - Text document/transcription
                                           distribution
</TABLE>
 
 * Under development
 
 + Not Internet-enabled
 
    The primary applications and services currently available or under
development are described in greater detail below. Certain of these applications
were acquired by the Company and are not yet Internet-enabled; the Company is
currently redeveloping or replacing these applications to integrate them with
the Healtheon Platform.
 
    MEMBERSHIP SERVICES.  Healtheon provides membership services through its
Benefits Administration application. The Benefits Administration application was
developed internally and operates on the Healtheon Platform. The application
provides Internet-based connectivity between healthcare payors and consumers and
supports transactions such as selection of health plans and providers,
enrollment for benefits and benefit inquiries. Benefits Administration users
also receive Healtheon's Health Risk Appraisal service, which provides consumer
education in wellness and health risks. Healtheon has deployed this application
directly and through aggregators to 25 companies, covering approximately 30,000
members.
 
    HEALTHCARE ADMINISTRATION AND FINANCIAL MANAGEMENT.  Healtheon supports or
will support healthcare administration and financial management transactions
through its ProviderLink, RACER and PACER applications. ProviderLink was
licensed by the Company's ActaMed subsidiary from United HealthCare Corporation.
The Company is currently developing a software interface between the Healtheon
Platform
 
                                       39
<PAGE>
and ProviderLink to integrate ProviderLink with the Company's network-based
services. ProviderLink is used by providers to support transactions and
workflows with payors. ProviderLink supports transactions such as eligibility
determinations, claims submission and status, and remittance advice. For
example, physicians use ProviderLink to determine eligibility of patients to
receive care and to submit health claims to payors. ProviderLink is currently
deployed in over 4,000 active provider sites in more than 20 major markets, and
processes over 2.5 million transactions per month.
 
    The Company is developing RACER, a new Internet-based provider application
with support from Brown & Toland, one of the Company's strategic partners. RACER
is designed to provide all of the functionality of ProviderLink and also support
referrals, authorization, and provider directories reporting. Providers using
the RACER service will be able to receive real-time patient eligibility
verifications and referral authorizations over the Healtheon VHN.
 
    The Company is developing PACER, a new Internet-based payor application,
with support from Beech Street, one of the Company's strategic partners. PACER
is designed to support the creation and management of networks of providers.
PACER is designed to enable the management of large, complex provider
directories and files, manage provider relationships and contracts and perform
certain claim adjudication functions, such as claim repricing. See "-- Strategic
Relationships."
 
    CLINICAL INFORMATION SERVICES.  The Company's SCAN product supports ordering
and distribution of clinical tests and test results between SmithKline Labs and
providers using SmithKline Labs' services. ActaMed acquired the SCAN application
from SmithKline Labs. SCAN is deployed on approximately 4,400 installed
workstations serving physicians throughout the United States. SCAN is not
Internet-enabled; however, the Company is developing a new Internet-enabled
application called ActaLab that will combine the functionality of SCAN and
ProviderLink. See "-- Strategic Relationships."
 
    The Company's Global Master Person Index ("GMPI") enables the unique
identification of a patient and reconciliation of multiple records for the same
patient contained on diverse information systems. GMPI also supports access to
patient data and registration information as well as clinical records. GMPI is
an object-oriented application developed by ActaMed and is not yet
Internet-enabled. Healtheon intends to adapt and implement GMPI functionality on
the Healtheon Platform.
 
    OTHER SERVICES.  Healtheon also provides professional services to its
customers to enable them to define, develop and implement network-based
information systems that leverage the capabilities of the Healtheon Platform.
These services are typically sold on a fixed fee or time and materials basis.
These services include consulting on information systems strategy related to the
use of the Internet and secure networks, including design of information systems
functional specifications, mapping and redesign of business processes and
identification of enterprise transformation and training requirements to take
advantage of increased connectivity. Healtheon also provides custom development
of applications and enables the deployment of Healtheon services and integration
with legacy information technology systems. In addition, Healtheon provides
transitional network management services of its customers' networks. The Company
believes that its success is partially dependent upon its ability to introduce
new applications in several healthcare markets in a relatively short period of
time. The Company currently offers a limited number of applications on its
platform.
 
CUSTOMERS AND MARKETS
 
    Healtheon's target customers include providers, payors, suppliers and
consumers. Because the Company believes that the value and benefit of
Healtheon's services are directly related to both the number of participants
using Healtheon VHNs and the breadth of functionality supported, it intends
initially to focus on selected regions where it can quickly gain significant
market acceptance. Healtheon is presently targeting a number of regional markets
across the United States.
 
                                       40
<PAGE>
    PROVIDERS.  Healtheon's target provider customers include aggregators of
individual physicians such as large medical groups, independent practice
associations, physician practice management companies and other large, organized
physician entities. In particular, the Company seeks to form strategic
relationships with providers with a high degree of involvement in managed care,
especially providers that are involved in activities such as capitation, which
require them to bear some level of insurance risk for each enrolled patient.
Healtheon's services for these providers include benefit eligibility
determinations, referrals and authorizations, claims processing, ordering of
clinical tests and delivery of results and maintenance of patient histories.
Healtheon also targets as potential customers large integrated delivery networks
that combine multiple healthcare facilities, such as hospitals, outpatient
facilities, labs and diagnostic centers, and affiliate with physicians and
physician groups to coordinate care, contract for managed care lives and manage
healthcare resource utilization. Healtheon offers these customers the following
services: patient identification, patient registration, ordering of clinical
tests and delivery of results and distribution of text documents across the
network. The Company's current customers in this category include Brown & Toland
and the Greater Dayton Area Hospital Association.
 
    PAYORS.  Healtheon's target payor customers include managed care
organizations, indemnity insurers, third-party administrators and federal and
state governmental agencies. Target managed care organization customers include
mid-sized to large HMOs and PPOs. Healtheon's services for these customers
include eligibility determination, member customer service functions, referral
and authorization management, coordination of provider files and directories,
and submission and tracking of claims and patient encounter reports. Target
indemnity insurer and third-party administrator customers include mid-sized to
large commercial entities, Medicare and other agencies of federal and state
government. The Company's current customers in this category consist of United
HealthCare, Beech Street, Sun Life of Canada, Blue Shield of California, CIGNA
HealthCare and the Health Care Financing Administration.
 
    SUPPLIERS.  Healtheon's target supplier customers include large national
laboratory companies, pharmaceutical companies and pharmacy benefit managers.
Healtheon's services for laboratory companies include ordering clinical tests
and reporting test results. The Company's principal customer in this category is
SmithKline Labs.
 
    CONSUMERS.  Healtheon's target consumer customers include employers, health
plans and health plan brokers. Healtheon's services for these consumer
representatives include health plan enrollment, benefits administration and
membership coordination. Healtheon's target employer group includes mid-sized
and large employers and, particularly, self-funded employers that have complex
benefits management needs. Healtheon's target health plan broker customers
include mid-sized to large brokers that aggregate small and medium employers and
administer healthcare benefits on their behalf. Healtheon services 25 employers
covering approximately 30,000 members.
 
STRATEGIC RELATIONSHIPS
 
    The Company has entered into several strategic relationships that it
believes will enhance its application portfolio, provide important specialized
industry expertise, increase its market penetration, and generate revenue.
Certain of these relationships are described below:
 
   
    UNITED HEALTHCARE CORPORATION.  United HealthCare is the largest HMO in the
United States. United HealthCare is the Company's largest stockholder and will
own approximately 13.7% of the Company's Common Stock after the Underwritten
Offering and the Related Sale. In March 1996, the Company acquired United
HealthCare's ProviderLink network which supports over 4,000 active provider
sites in more than 20 major markets servicing over 2.5 million transactions per
month. The Company earns transaction fee revenue by providing certain healthcare
information services to United HealthCare, members of United HealthCare's
provider network and ProviderLink subscribers. In April 1996, the Company and
United HealthCare entered into a Services and License Agreement (the "United
HealthCare Agreement") under which the Company, using ProviderLink, provides
claims processing, referral, eligibility and enrollment services, to United
HealthCare's managed care providers and
    
 
                                       41
<PAGE>
customers. Under the United HealthCare Agreement, the Company currently receives
a monthly fee for each user site enrolled with United HealthCare and a fee per
transaction. However, the United HealthCare Agreement does not guarantee any
minimum level of transactions or payments to the Company. The United HealthCare
Agreement has a five year term; however, the agreement provides that two years
after the date of the agreement (April 4, 1998) the parties will agree on new
prices that will be competitive with the marketplace. The Company and United
HealthCare are negotiating such new prices, and the Company anticipates that the
new prices will reduce the rates paid by United HealthCare. United HealthCare
has also agreed during the term of the United HealthCare Agreement not to
promote or contract for services providing the same functionality as that
provided by the Company, although United HealthCare is permitted to continue to
utilize services it was utilizing when it entered into the United HealthCare
Agreement. In addition, through ActaMed, the Company has developed PLNet, an
Internet-based version of ProviderLink, which the Company intends to integrate
into the Healtheon Platform and offer to other major healthcare payors and
providers. The Company is working with United HealthCare to expand the
applications and content available to United HealthCare's provider network, to
increase the size and geographic reach of its provider network, and to
assimilate newly acquired health plans. William McGuire, M.D., the Chairman and
CEO of United HealthCare, is a member of the Company's Board of Directors. The
United HealthCare Agreement is effective through March 2001, subject to earlier
termination in the event the Company fails to meet certain network performance
standards or otherwise breaches its material obligations under the United
HealthCare Agreement.
 
   
    SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC.  SmithKline Beecham Clinical
Laboratories, Inc. ("SmithKline Labs"), a subsidiary of SmithKline Beecham, is
one of the largest independent clinical laboratories in the United States.
SmithKline is a stockholder of the Company and will own approximately 6.9% of
the Company's Common Stock after the Underwritten Offering and the Related Sale.
In December 1997, the Company and SmithKline Labs entered into a Services
Agreement (the "Services Agreement") under which the Company provides lab orders
and results to providers that use SCAN. SmithKline Labs has also agreed to
promote the Company as its preferred vendor for laboratory electronic
connectivity services. The Company acquired SCAN-related assets from SmithKline
Labs, including approximately 4,200 installed workstations in physicians'
offices, hospitals and other provider offices. The Company is currently
developing ActaLab, an Internet-enabled version of the SCAN system, which the
Company plans to integrate into the Healtheon Platform and to offer to
physicians using SmithKline Labs' services or to physicians using other
laboratories. Tadataka Yamada, M.D., President of SmithKline Beecham Healthcare
Services, is a member of the Company's Board of Directors. The Services
Agreement is effective through December 2002, with options for successive
two-year renewals, subject to earlier termination in the event the Company fails
to meet certain network performance standards or if the Company otherwise
breaches its material obligations under the Services Agreement. The Services
Agreement provides that the parties will negotiate new rates as of January 1,
2001 and each two years thereafter. Pursuant to the Services Agreement, the
renegotiated rates must be competitive with the marketplace and must be no
higher than the lowest fees charged by the Company to similarly situated
customers.
    
 
    BROWN & TOLAND PHYSICIAN SERVICES ORGANIZATION.  Brown & Toland Medical
Group ("BTMG"), based in San Francisco, California, is a partnership of
approximately 2,000 physicians representing a merger of physicians from
California Pacific Medical Center, the University of California-San Francisco
and Stanford University. Brown & Toland Physician Services Organization ("Brown
& Toland"), a wholly owned subsidiary of BTMG, is the management company that
administers the managed care risk business on behalf of BTMG and other physician
organizations. In December 1997, the Company and Brown & Toland entered into an
agreement under which the Company is developing RACER, which the Company intends
to market to Brown & Toland and other payors and providers. The Company also
manages the information technology operations of Brown & Toland. Through its
relationship with Brown & Toland, the Company believes it is gaining valuable
industry-segment expertise from a leader in managed care and accelerating
 
                                       42
<PAGE>
its market presence in the San Francisco Bay Area. The Company's agreement with
Brown & Toland is effective through September 2000, although it may be
terminated by either party upon 120 days' notice.
 
    BEECH STREET CORPORATION.  Beech Street is one of the largest PPOs in the
United States. Beech Street's PPO network consists of approximately 4,300
hospitals and 320,000 physician locations serving 15 million individuals in 49
states, and its clients consist of major self-insured employers, insurance
companies and third-party administrators. In December 1997, the Company and
Beech Street have entered into an agreement under which the Company is
developing PACER, which the Company intends to offer to Beech Street and to
other payors and providers. The Company also manages the information technology
operations of Beech Street. The relationship with Beech Street provides the
Company with important industry-segment expertise and a strategic entry-point
into the PPO market segment. The Company's agreement with Beech Street is
effective through December 2002, although it may be terminated by either party
upon 180 days' notice. See "Risk Factors -- Reliance on Strategic
Relationships."
 
THE HEALTHEON PLATFORM
 
    The Healtheon Platform is a CORBA-based distributed application framework,
combined with software tools that ensure security, scalability, availability,
reliability and manageability, on which transaction intensive applications can
be delivered over the Internet or over other distributed environments. The
Healtheon Platform is deployed on a server complex at the Healtheon data center
in Santa Clara, California, which consists of SUN Solaris servers in a fault
tolerant configuration and redundant or fault tolerant network components. The
Healtheon Platform includes the following features:
 
    SECURITY.  The Healtheon Platform is designed to ensure the privacy and
integrity of data and communications by using a combination of security
methodologies to provide multiple lines of defense. All Internet communications
between Healtheon and its users employ the Secure Sockets Layer protocol. In
addition, Healtheon utilizes server digital certificates and username/password
schemes to authenticate users. Each user has a unique user ID and has one or
more roles that define the types of functionality and data access available. All
Healtheon's applications record logging information, creating an audit trail,
and protect privacy by encrypting sensitive data. The Company also uses a
multi-layered firewall complex to secure the Healtheon network infrastructure.
In addition, network vulnerability scanners are used on a regular basis to
actively monitor security status. Healtheon's physical security systems at its
Santa Clara facility consist of comprehensive physical controls and
multi-layered internal network and information system safeguards. The physical
controls include using fingerprint authentication, dual-level access points, and
multiple alarm systems.
 
    SCALABILITY.  The Healtheon Platform utilizes CORBA-based middleware, which
enables a highly scalable distributed applications infrastructure. The platform
enables an application to run simultaneously on multiple host systems, allowing
for large numbers of simultaneous users while at the same time optimizing
network performance and resource utilization. In addition, the Healtheon
Platform has been designed to transparently deploy new services and hardware
while existing applications remain operational. Finally, the Healtheon Platform
reduces communications bottlenecks resulting from limited numbers of connections
to database servers through intelligent management of database connections and
object caches that reduce the need to query database servers for frequently used
data. See "Risk Factors -- Unproven Platform Infrastructure and Scalability."
 
    RAPID APPLICATION DEVELOPMENT AND INTEGRATION.  The Healtheon Platform is
designed to enable rapid application development and integration. The platform
supports object-oriented programming, which accelerates the design process
through object reuse. The Company maintains a comprehensive set of object
libraries, called core services, that allows developers to build complex
applications rapidly. The platform is also designed for deploying applications
developed by third parties with relative ease. The platform interfaces with
legacy systems by accepting industry standard ANSI X.12 and HL7 electronic data
interchange formats.
 
                                       43
<PAGE>
    HIGH AVAILABILITY.  The Healtheon Platform architecture is designed to
ensure high availability through the replication of applications and other
software services, failure detection and automatic restart of failed services
and applications. Running multiple copies of a service or application removes
any single point of failure within the system and ensures that at least some
copies of a service will be available while others may have failed. In addition,
the servers that host Healtheon applications are duplicated to provide
redundancy. Healtheon uses duplicate fiber optic cable connections to Sprint and
WorldCom to ensure highly-available access to the Internet. The Company's
platform uses a mix of fault-tolerant hardware, redundant equipment and back-up
power systems.
 
    MANAGEABILITY.  The Healtheon management framework provides a single image
view of all Healtheon services, thus simplifying administration in a distributed
environment. Healtheon services can be managed from a Web-based management
station. The Healtheon management and administration framework monitors service
performance and generates event notifications of system abnormalities.
 
    DISASTER RECOVERY PLANS.  Although the Company believes its operations
facilities are highly resistant to systems failure and sabotage, it has
developed, and is in the process of implementing, a disaster recovery and
contingency operations plan. In addition, all of the Company's services are
linked to advanced storage systems that provide data protection through
techniques such as replication. The Company also maintains on-site backup power
systems.
 
    AUDITS.  The Company's information technology department periodically
performs, and retains accredited third parties to perform, audits of its
operational procedures under both internally-developed audit procedures and
externally-recognized standards.
 
CUSTOMER SUPPORT
 
    The Company believes that a high level of customer support is necessary to
achieve wide acceptance of its solution. The Company provides a wide range of
customer support services through a staff of customer service personnel,
multiple call centers and an e-mail help desk. The Company also offers Web-based
support services that are available 24 hours a day, seven days a week and are
frequently updated to improve existing information and to support new services.
The Company also employs technical support personnel who work directly with its
direct sales force, distributors and customers of its applications and services.
The Company provides its customers with the ability to purchase maintenance for
its applications and services, which includes technical support and upgrades.
The Company also provides training programs for its customers. As of June 30,
1998, the Company had 164 employees in customer support functions, including
network services, provider services and customer support services.
 
SALES AND MARKETING
 
    Healtheon's sales and marketing efforts are organized according to its four
main customer segments: providers, payors, suppliers and consumers. Healtheon's
direct sales force targets significant potential customers in each market
segment by region. In certain instances, the Company's direct sales force works
with complementary brokers, value added resellers and systems integrators to
deliver complete solutions for major customers. In addition, senior management
plays an active role in the sales process by cultivating industry contacts. The
Company markets its applications and services through direct sales contacts,
strategic relationships, the sales and marketing organizations of its strategic
partners, participation in trade shows, articles in industry publications and by
leveraging its existing client base. Healtheon attends a number of major trade
shows each year and has begun to sponsor executive conferences, which feature
industry experts who address the information systems needs of large healthcare
organizations. The Company supports its sales force with technical personnel who
perform demonstrations of Healtheon's applications and assist clients in
determining the proper hardware and software configurations. The Company's
executive sales and marketing management is located in its Santa Clara,
California headquarters and in its Atlanta, Georgia and Minneapolis, Minnesota
facilities, while its account
 
                                       44
<PAGE>
representatives are deployed across the United States. As of June 30, 1998, the
Company employed 44 sales executives, account managers, direct sales
representatives and sales support personnel.
 
DEVELOPMENT AND ENGINEERING
 
    The Company believes that its future success will depend in large part on
its ability to continue to maintain and enhance its platform, applications and
services. To this end, the Company leverages the modular nature of its platform
architecture to enable it to develop new applications and services rapidly. The
Company has developed applications and services both independently and through
acquisitions. The Company will continue to work closely with other companies in
its applications development efforts.
 
    The Company has several significant projects currently in development. These
include the continued enhancement of the platform architecture, development of
new applications such as RACER, PACER and ActaLab, and integration of ActaMed's
platform, network and associated services. As of June 30, 1998, the Company
employed 144 people in the areas of applications design, research and
development, quality assurance and technical support.
 
    In 1995, 1996, 1997 and the six months ended June 30, 1998, the Company's
development and engineering expense (which excludes development expenses
included in total cost of revenue) totaled $2.4 million, $8.6 million, $13.0
million and $8.3 million, respectively, representing 112%, 78%, 97% and 40%,
respectively, of its total revenue. The Company believes that timely development
of new and enhanced applications and technology is necessary to remain
competitive in the marketplace. Accordingly, the Company intends to continue
recruiting and hiring experienced development personnel and to make other
investments in development and engineering.
 
    The emerging market for healthcare information exchange and transaction
processing is characterized by rapid technological developments, frequent new
application introductions and evolving industry standards. The emerging nature
of this market and its rapid evolution will require that the Company continually
improve the performance, features and reliability of its applications and
services, particularly in response to competing offerings, and that it introduce
new applications and services or enhancements to existing applications and
services as quickly as possible and prior to its competitors. The success of new
application and service introductions is dependent on several factors, including
proper definition of new applications or services, timely completion and
introduction of new applications and services, differentiation of new
applications and services from those of the Company's competitors and market
acceptance. There can be no assurance that the Company will be successful in
developing and marketing new applications and services that respond to
competitive and technological developments and changing customer needs. The
failure of the Company to develop and introduce new applications and services
successfully on a timely basis and to achieve market acceptance for such
applications and services could have a material adverse effect on the Company's
business, financial condition and results of operations. In addition, the
widespread adoption of new Internet, networking or telecommunication
technologies or standards or other technological changes could render its
applications and services obsolete or require substantial expenditures by the
Company to adapt its applications and services. Moreover, there is a risk that a
competitor's product might become the standard for healthcare information
services. See "Risk Factors -- Rapid Technological Change; New Application and
Services Introductions."
 
INTELLECTUAL PROPERTY
 
    The Company relies upon a combination of trade secret, copyright and
trademark laws, license agreements, confidentiality procedures, employee
nondisclosure agreements and technical measures to maintain the secrecy of its
intellectual property. The Company believes that patent, trade secret and
copyright protection are less significant to the Company's success than its
ability to further develop applications. The Company has several trademarks in
the United States and internationally. See "Risk Factors -- Dependence on
Proprietary Technology; Potential Litigation."
 
                                       45
<PAGE>
COMPETITION
 
    The market for healthcare information services is intensely competitive,
rapidly evolving and subject to rapid technological change. Many of the
Company's actual and potential competitors have announced or introduced Internet
strategies. The Company's competitors can be divided into several groups:
healthcare information software vendors, including HBO & Company and Shared
Medical Systems Corporation; healthcare electronic data interchange companies,
including ENVOY Corporation and National Data Corporation; and large information
technology consulting service providers, including Andersen Consulting,
International Business Machines Corporation and Electronic Data Systems
Corporation. Each of these companies can be expected to compete with the Company
within certain segments of the healthcare information technology market.
Furthermore, major software information systems companies and others, including
those specializing in the healthcare industry that are not presently offering
applications that compete with those offered by the Company, may enter the
Company's markets. In some cases, large customers may have the ability to
compete directly with the Company as well. The Company also competes with
smaller regional competitors. Many of the Company's competitors and potential
competitors have significantly greater financial, technical, product
development, marketing and other resources and greater market recognition than
the Company. Many of the Company's competitors also currently have, or may
develop or acquire, substantial installed customer bases in the healthcare
industry. As a result of these factors, the Company's competitors may be able to
respond more quickly to new or emerging technologies and changes in customer
requirements or to devote greater resources to the development, promotion and
sale of their applications or services than the Company. There can be no
assurance that the Company will be able to compete successfully against current
and future competitors or that competitive pressures faced by the Company will
not materially adversely affect its business, financial condition and results of
operations.
 
GOVERNMENT REGULATION AND HEALTHCARE REFORM
 
    Laws and regulations may be adopted with respect to the Internet or other
on-line services covering issues such as user privacy, pricing, content,
copyrights, distribution and characteristics and quality of products and
services. The adoption of any additional laws or regulations may impede the
growth of the Internet or other on-line services, which could, in turn, decrease
the demand for the Company's applications and services and increase the
Company's cost of doing business, or otherwise have an adverse effect on the
Company's business, financial condition and results of operations. For example,
under current Health Care Financing Administration guidelines, Medicare
eligibility information cannot be transmitted over the Internet. Moreover, the
applicability to the Internet of existing laws in various jurisdictions
governing issues such as property ownership, sales and other taxes, libel and
personal privacy is uncertain and may take years to resolve. Any such new
legislation or regulation, the application of laws and regulations from
jurisdictions whose laws do not currently apply to the Company's business, or
the application of existing laws and regulations to the Internet and other
online services could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
    The confidentiality of patient records and the circumstances under which
such records may be released for inclusion in the Company's databases are
subject to substantial regulation by state governments. These state laws and
regulations govern both the disclosure and the use of confidential patient
medical record information. Although compliance with these laws and regulations
is at present principally the responsibility of the hospital, physician or other
healthcare provider, regulations governing patient confidentiality rights are
evolving rapidly. Additional legislation governing the dissemination of medical
record information has been proposed at both the state and federal level. This
legislation may require holders of such information to implement security
measures that may require substantial expenditures by the Company. There can be
no assurance that changes to state or federal laws will not materially restrict
the ability of healthcare providers to submit information from patient records
using the Company's applications.
 
                                       46
<PAGE>
    Legislation currently being considered at the federal level could impact the
manner in which the Company conducts its business. The Health Insurance
Portability and Accountability Act of 1996 mandates the use of standard
transactions, standard identifiers, security and other provisions by the year
2000. The Company is designing its Platform and applications to enable
compliance with the proposed regulations; however, until such regulations become
final, they could change, which could require the Company to expend additional
resources to comply with the revised standards. In addition, the success of the
Company's compliance efforts may be dependent on the success of healthcare
participants in dealing with the standards.
 
    International regulations with respect to the Internet, privacy and
transborder data flows are considerably more developed than regulations in the
United States. The Company intends to develop applications and services to be
used on a worldwide basis and, consequently, will be required to comply with
international regulations regarding the Internet and electronic commerce, as
well as with U.S. regulations. The Company has not evaluated the effect that
these regulations would have on its business, and there can be no assurance that
such regulations will not have an adverse effect on the Company's ability to
compete internationally.
 
    The United States Food and Drug Administration is responsible for assuring
the safety and effectiveness of medical devices under the Federal Food, Drug and
Cosmetic Act. Computer applications and software are considered medical devices
and subject to regulation by the FDA when they are indicated, labeled or
intended to be used in the diagnosis of disease or other conditions, or in the
cure, mitigation, treatment or prevention of disease, or are intended to affect
the structure or function of the body. The Company does not believe that any of
its current applications or services are subject to FDA jurisdiction or
regulation; however, the Company plans to expand its application and service
offerings into areas that may subject it to FDA regulation. The Company has no
experience in complying with FDA regulations. Healtheon's compliance with FDA
regulations could prove to be time consuming, burdensome and expensive, which
could have a material adverse effect on the Company's ability to introduce new
applications or services in a timely manner.
 
EMPLOYEES
 
    As of June 30, 1998, the Company had a total of 379 employees, of whom 101
engaged in customer and network services, 144 in development and engineering, 8
in consulting services, 63 in provider services, 44 in sales and marketing and
19 in corporate finance and administration. None of the Company's employees is
represented by a labor union, and the Company has never experienced a work
stoppage. The Company believes its relationship with its employees to be good.
The Company's ability to achieve its financial and operational objectives
depends in large part upon its continuing ability to attract, integrate, retain
and motivate highly qualified sales, technical and managerial personnel, and
upon the continued service of its senior management and key sales and technical
personnel, most of whom are not bound by an employment agreement. Competition
for such qualified personnel in the Company's industry and geographical location
in the San Francisco Bay Area is intense, particularly in software development
and technical personnel. See "Risk Factors -- Dependence on Key Personnel."
 
FACILITIES
 
    The Company's principal executive and corporate offices and development and
network operations are located in Santa Clara, California, in approximately
50,000 square feet of leased office space under a lease that expires in March
2008. The Company also maintains sales, development and network operations in
Atlanta, Georgia, in approximately 41,000 square feet of leased office space
under a lease that expires in July 2001; and sales, engineering and support
operations in Minneapolis, Minnesota, in approximately 16,500 square feet of
leased office space under a lease that expires in December 1999. The Company
believes that its facilities are adequate for its current operations and that
additional leased space can be obtained if needed.
 
                                       47
<PAGE>
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
    The following table sets forth certain information regarding the Company's
current executive officers and directors:
 
<TABLE>
<CAPTION>
NAME                                  AGE                 POSITION
- -----------------------------------  -----   -----------------------------------
<S>                                  <C>     <C>
James H. Clark(1)(2)...............   53     Chairman of the Board of Directors
W. Michael Long(3).................   46     Chief Executive Officer and
                                             Director
Michael K. Hoover..................   43     President and Director
Ron Alvarez........................   49     Vice President, Consumer Group
Mark Bailey........................   39     Vice President, Business
                                             Development
Kallen Chan........................   43     Corporate Controller
Jack Dennison......................   41     Vice President and General Counsel
Dennis Drislane....................   49     Vice President, Customer and
                                             Network Services
Edward Fotsch, M.D.................   41     Vice President, Physician and
                                             Integrated Delivery Network Group
Piers G.D. Fox.....................   53     Vice President, Europe
Nancy Ham..........................   37     Vice President, Laboratories and
                                             Pharmaceuticals
J. Philip Hardin...................   35     Vice President, Managed Care Group
John R. Hughes, Jr.................   45     Vice President, Provider Services
Krishna Kolluri....................   35     Vice President, Applications
Pavan Nigam........................   39     Vice President, Engineering
Charles Saunders, M.D..............   43     Vice President, Marketing and
                                             Consulting Services and Medical
                                             Director
John L. Westermann III.............   53     Vice President, Chief Financial
                                             Officer, Secretary and Treasurer
L. John Doerr(1)(2)................   46     Director
C. Richard Kramlich(1)(2)..........   63     Director
William W. McGuire, M.D.(1)(2).....   50     Director
P. E. Sadler(1)(2).................   63     Director
Tadataka Yamada, M.D.(1)(2)........   53     Director
</TABLE>
 
- ---------
 
(1) Member of the Audit Committee.
 
(2) Member of the Compensation Committee.
 
(3) Member of the Stock Option Committee.
 
    JAMES H. CLARK has served as Chairman of the Board of the Company since he
co-founded it in December 1995. Dr. Clark co-founded Netscape Communications
Corporation in April 1994 and has served as the Chairman of the Board of
Directors of Netscape since its inception. He served as President and Chief
Executive Officer of Netscape from its founding until December 1994. From 1981
until 1994, Dr. Clark served as Chairman of the board of directors of Silicon
Graphics, Inc., a company which he founded in 1981. Prior to founding Silicon
Graphics, Dr. Clark was an Associate Professor at Stanford University. He holds
a B.S. and an M.S. from the University of New Orleans and a Ph.D. from the
University of Utah.
 
    W. MICHAEL LONG has served as Chief Executive Officer and a director of the
Company since joining the Company in July 1997. Prior to joining the Company,
Mr. Long was President and Chief Executive Officer of CSC Continuum, Inc.
("CSC"), a unit of Computer Sciences Corporation from August 1996 to
 
                                       48
<PAGE>
July 1997. For more than five years prior to its acquisition by CSC, he was
President and Chief Executive Officer of The Continuum Company, Inc., a provider
of IT and consulting services to the financial industry. He holds a B.A. from
the University of North Carolina.
 
   
    MICHAEL K. HOOVER has served as President and a director of the Company
since the Company acquired ActaMed Corporation in May 1998. Mr. Hoover
co-founded ActaMed in May 1992, and served as its President from its inception
to May 1998, and as its President and Chief Executive Officer from December 1995
to May 1998. From 1989 to 1992, Mr. Hoover served as the Executive Director of
Financial Services of the MicroBilt division of First Financial Management
Corporation. Prior to that, he founded FormMaker Software Corporation, a
producer of electronic forms automation systems, and served as its Chief
Executive Officer from 1982 to 1988 and as its Executive Vice President during
1988.
    
 
    RON ALVAREZ has served as Vice President, Consumer Group of the Company
since June 1998, and prior to that served as Vice President, Sales since joining
the Company in July 1997. Prior to joining the Company, Mr. Alvarez spent ten
years at Informix Software, Inc. as Vice President of North American Sales and
as head of its Latin American operations. Prior to that time, he was District
Sales Manager at Metaphor Computer Systems. Mr. Alvarez has also held sales
positions at Storage Technology Corporation and Xerox Corporation. Mr. Alvarez
holds a B.S. from California State University in Sacramento and an M.B.A. from
the University of Missouri.
 
    MARK BAILEY has served as Vice President, Business Development of the
Company since joining the Company in July 1998. Prior to joining the Company,
Mr. Bailey served as general partner at Venrock Associates, the venture capital
arm for the Rockefeller family, from October 1997 to April 1998. Prior to that
he was Senior Vice President Business Development at Symantec Corporation, a
provider of productivity and utilities software, where he directed mergers and
acquisitions efforts from December 1989 to October 1997. Before joining
Symantec, he was an associate with Kleiner Perkins Caufeld & Byers, a venture
capital firm, from June 1985 to December 1989. Mr. Bailey holds an MBA from
Harvard University and a BSE from Princeton University.
 
    KALLEN CHAN has served as Corporate Controller of the Company since April
1996. Prior to joining the Company, Mr. Chan was the Director of Audit and Group
Controller for Worldwide Manufacturing at Cirrus Logic, Inc. since March 1995.
From January 1993 to February 1995, Mr. Chan was Vice President of Finance and
Chief Financial Officer of Comtech Labs Inc., a video imaging technology
company. From 1986 to 1992, Mr. Chan served as Chief Financial Officer for
various early stage companies, including Caeco Inc., Harmonic Lightwaves, Inc.
and Oasic Technology, Inc. Prior to 1986, Mr. Chan spent nine years at Philips
Semiconductor as a Division Controller. He holds a B.S. in commerce and an
M.B.A. from the University of Santa Clara.
 
    JACK DENNISON has served as Vice President and General Counsel of the
Company since joining the Company in July 1998. Mr. Dennison served as Deputy
General Counsel of Computer Sciences Corporation from August 1996 to July 1998.
Prior to that time, Mr. Dennison served as Vice President and General Counsel of
The Continuum Company, Inc. Prior to joining Continuum in 1989, he was a partner
with Ford, Dennison & Byrne in Austin, Texas. Mr. Dennison holds a B.A. and a
J.D. from the University of Texas.
 
    DENNIS DRISLANE has served as Vice President, Customer and Network Services
of the Company since joining the Company in July 1997. Mr. Drislane served as
Vice President, Communications Industry Group, at Electronic Data Systems
Corporation ("EDS") from June 1995 to July 1997. From October 1992 to June 1995,
he was President of EDS' Healthcare Division. Prior to October 1992, he held
various management positions for EDS. Mr. Drislane holds both a B.S. and an M.S.
in business administration from California State University in Sacramento.
 
    EDWARD FOTSCH, M.D. has served as the Vice President, Physician and
Integrated Delivery Network group of the Company since the Company acquired
Metis, LLC in August 1998. Dr. Fotsch served as
 
                                       49
<PAGE>
President and Chief Executive Officer of Metis, LLC from March 1997 to August
1998. Prior to working at Metis, LLC, Dr. Fotsch served as Vice President of
Healthcare for NetSource Communications Inc., an Internet development and
consulting organization, from November 1994 to March 1997. Prior to working at
NetSource, Dr. Fotsch was President of Med-Tech Consulting, a healthcare
consulting firm from October 1992 through November 1994. Dr. Fotsch practiced
medicine as Chief of the Department of Emergency Medicine at Doctors Hospital in
Northern California for ten years prior to 1994. He holds a Doctorate in
Medicine from the Medical College of Wisconsin and a B.S. from Marquette
University.
 
    PIERS G. D. FOX has served as Vice President, Europe of the Company since
joining the Company in May 1998. From September 1997 to May 1998, Mr. Fox was a
Principal of Fast Growth Practice, a business advisory consulting firm. From
August 1996 to September 1997, Mr. Fox served as Executive Vice President of
Computer Sciences Corporation's Integrated Business Services group. From April
1995 to July 1996, he served as Executive Vice President of Global Outsourcing
Sales for The Continuum Company, Inc., a provider of information technology and
consulting services to the financial industry. From September 1990 to April
1995, he served as Continuum's Senior Vice President, Europe, and from September
1984 to May 1990, as Continuum's Managing Director (Europe). Mr. Fox holds an MA
from Cambridge University.
 
    NANCY HAM has served as Vice President, Laboratories and Pharmaceuticals
Group of the Company since the Company acquired ActaMed in May 1998. Ms. Ham
served as a Senior Vice President of ActaMed from June 1996 to May 1998. She
served as Chief Financial Officer and Secretary of ActaMed from 1993 to May
1996. From 1992 to 1993, she was a Corporate Finance Director for the Capital
Finance Group of Equifax, Inc. Prior to that, she was an Assistant Vice
President at G.E. Capital Corporation. Ms. Ham holds a B.A. in economics from
Duke University and a masters in international business studies from the
University of South Carolina.
 
    J. PHILIP HARDIN has served as Vice President, Managed Care Group of the
Company since the Company acquired ActaMed in May 1998. Mr. Hardin served as
Vice President of Managed Care Operations of ActaMed from August 1997 until May
1998. He also served as Director of Payor Sponsorship for ActaMed from January
1997 to August 1997, and Project Executive from July 1995 to December 1996. From
August 1993 to June 1995, Mr. Hardin attended Stanford University and received
an MBA degree in June 1995. Prior to that, he served as Vice President, Finance,
Director of Finance and Controller of Melita International Corporation and held
various accounting positions at Arthur Andersen & Company. Mr. Hardin also holds
a B.B.A. in accounting from the University of Georgia.
 
    JOHN R. HUGHES, JR. has served as Vice President, Provider Services of the
Company since the Company acquired ActaMed in May 1998. Mr. Hughes served as
Chief Operating Officer of ActaMed from March 1996 to May 1998. Prior to working
at ActaMed, Mr. Hughes served as General Manager of the EDI Services Group of
United HealthCare from August 1992 to March 1996. Mr. Hughes served as Vice
President of North American Sales for Revelation Technologies, a computer
software company, from 1990 to 1992. From 1980 to 1990, Mr. Hughes was Vice
President, Sales Manager and Product Marketing Manager at Harris Corporation.
Mr. Hughes holds a B.S. in business administration from the University of
Kansas.
 
    KRISHNA KOLLURI has served as Vice President, Applications of the Company
since July 1998, and prior to that, as Senior Director of Development
Engineering of the Company since February 1996. Prior to joining the Company,
Mr. Kolluri spent six years at Silicon Graphics, Inc. From August 1993 to
February 1996, Mr. Kolluri served as Senior Engineering Manager of Applications
and Development Environments in the Interactive Media Group of Silicon Graphics,
Inc. From May 1992 to August 1993, he served as Senior Engineering Manager of
Programming Environments in Silicon Graphics' CASE group where he was involved
in the development and deployment of interactive TV projects in Orlando, Florida
and Urayasu, Japan. From March 1990 to May 1992, he was a Member of Silicon
Graphic's technical staff. Mr. Kolluri holds a B.S.M.E. from the Indian
Institute of Technology, Madras, India, an M.S. in
 
                                       50
<PAGE>
Operations Research from S.U.N.Y., Buffalo, and an M.S.C.S. from the University
of California, Santa Cruz.
 
    PAVAN NIGAM co-founded the Company and has served as its Vice President,
Engineering since February 1996. Prior to joining the Company, Mr. Nigam worked
at Silicon Graphics from August 1989 to January 1996, where he was the division
manager for Silicon Graphic's Interactive Media Group and was responsible for
deploying Time Warner, Inc.'s Interactive TV project in Orlando, Florida. From
1989 to 1993, he was director of Silicon Graphics' Casevision products. Prior to
1989, Mr. Nigam was employed by Atherton Technologies and Intel Corporation. Mr.
Nigam holds a B.S.E.E. from the Indian Institute of Technology and an M.S.C.S.
from the University of Wisconsin-Madison.
 
    CHARLES SAUNDERS, M.D. has served as Vice President, Marketing and
Consulting Services and Medical Director since joining the Company in September
1997. Prior to joining the Company, Dr. Saunders was a principal in the
consulting firm of A.T. Kearney, Inc./Electronic Data Systems Corporation from
September 1994 to August 1997. Prior to that time, Dr. Saunders was Executive
Director of managed care programs at San Francisco General Hospital, and served
as Medical Director of the San Francisco Department of Public Health, Paramedic
Division, from 1988 to 1994. He has conducted healthcare systems research for
and has served on the faculties of the University of California at San
Francisco, Vanderbilt University and the University of Colorado. Dr. Saunders
holds a B.S. in biology from the University of Southern California and an M.D.
from Johns Hopkins University.
 
    JOHN L. WESTERMANN III has served as Vice President, Chief Financial
Officer, Secretary and Treasurer of the Company since joining the Company in
July 1998. From August 1996 to July 1998, Mr. Westermann was Chief Financial
Officer and Vice President of CSC Continuum, Inc., a unit of Computer Sciences
Corporation. For more than five years prior to its acquisition by CSC, Mr.
Westermann was Chief Financial Officer, Vice President, Secretary and Treasurer
of The Continuum Company, Inc., a provider of IT and consulting services to the
financial industry. Mr. Westermann holds a B.A. from Northwestern University and
an M.B.A. from the University of Chicago Graduate School of Business.
 
   
    L. JOHN DOERR has served as a director of the Company since July 1997. He
has been a general partner at Kleiner Perkins Caufield & Byers ("KPCB"), a
venture capital firm, since 1980. Prior to joining KPCB, Mr. Doerr worked at
Intel Corporation for five years. He is a director of At Home Corporation,
Amazon.com, Inc., Netscape Communications Corporation, Intuit Inc., Platinum
Software Corporation and Sun Microsystems, Inc. He holds a B.S.E.E. and an
M.E.E. from Rice University and an M.B.A. from Harvard Business School.
    
 
    C. RICHARD KRAMLICH has served as a director of the Company since July 1996.
Mr. Kramlich is the co-founder and has been a General Partner of New Enterprise
Associates, a venture capital firm, since 1978. He is a director of Ascend
Communications, Inc., Com 21, Inc., Lumisys, Inc., Silicon Graphics, Inc.,
Chalone Wine Group, Inc. and SyQuest Technology, Inc. Mr. Kramlich holds a B.A.
from Northwestern University and an M.B.A. from Harvard Business School.
 
    WILLIAM W. MCGUIRE, M.D. has served as a director of the Company since the
Company acquired ActaMed in May 1998. He has been the President of United
HealthCare since 1989 and the Chief Executive Officer and Chairman of the Board
of Directors of United HealthCare since 1991. Prior to this, Dr. McGuire was
Executive Vice President and Chief Operating Officer of United HealthCare. Prior
to this time, he served as President and Chief Operating Officer ("COO") of Peak
Health Plan. Before becoming President and COO, he held a number of other
positions within that organization. Dr. McGuire practiced medicine in Colorado,
specializing in cardiopulmonary medicine. He holds a B.A. from the University of
Texas and an M.D. from the University of Texas Medical Branch.
 
    P. E. SADLER has served as a director of the Company since the Company
acquired ActaMed in May 1998. He was Chairman of the Board of ActaMed from the
time that he helped co-found it in 1992 until it was acquired by the Company,
and served as its Chief Executive Officer from 1992 until May 1996.
 
                                       51
<PAGE>
Prior to founding ActaMed, Mr. Sadler founded MicroBilt Corporation, a computer
processing company, and served as its Chairman, Chief Executive Officer and
President from 1981 until MicroBilt was acquired by First Financial Management
Corporation ("FFMC") in 1989. Following the acquisition of MicroBilt, he served
as President of the MicroBilt division of FFMC until 1991. Mr. Sadler also
founded Agency Data Systems in 1972 and served as its President until the
company was acquired in 1975. Mr. Sadler also served on the board of
Knowledgeware, Inc. from 1990 to 1995 and currently serves on the Board of
Directors of Central Parking, Inc., an operator of parking lots. Mr. Sadler
holds a B.A. in business and economics from Vanderbilt University.
 
    TADATAKA YAMADA, M.D. has served as a director of the Company since the
Company acquired ActaMed in May 1998. Dr. Yamada has been President and
Executive Director of SmithKline Beecham HealthCare Services since February 1996
and has been a non-executive director of SmithKline Beecham's Board of Directors
since February 1994. From June 1990 to February 1996, Dr. Yamada was Chairman of
the Internal Medicine department and Physician-in-Chief of the University of
Michigan Medical Center. Prior to that time, Dr. Yamada was a Professor and
Chief of the Gastroenterology Division at the University of Michigan Medical
School's Internal Medicine department. Prior to his work at the University of
Michigan, Dr. Yamada was an associate professor of medicine at the UCLA School
of Medicine. Dr. Yamada is also a director of Genevco, Inc. Dr. Yamada holds a
B.A. in history from Stanford University and an M.D. from the New York
University School of Medicine.
 
    The Company's Bylaws authorize no fewer than six and no more than eight
directors. The size of the Board of Directors (the "Board") is currently set at
eight. The Certificate of Incorporation and the Bylaws of the Company also
provide for a staggered Board. Under this provision, the Board designates each
director position as one of three categories. Each year the directors' positions
in one of the categories are subject to election so that it would take up to
three years to replace the entire Board (absent resignation or premature
expiration of a director's term). Executive officers of the Company are
appointed by the Board and serve at the discretion of the Board. There are no
family relationships among any of the directors or executive officers of the
Company.
 
BOARD COMMITTEES
 
    The Board currently has three committees: an Audit Committee, a Stock Option
Committee and a Compensation Committee.
 
    The Audit Committee is currently comprised of Dr. Clark, Mr. Doerr, Mr.
Kramlich, Dr. McGuire, Mr. Sadler and Dr. Yamada. The Audit Committee reviews
and, as it deems appropriate, recommends to the Board the internal accounting
and financial controls for the Company and the accounting principles and
auditing practices and procedures to be employed in preparation and review of
the financial statements of the Company. The Audit Committee makes
recommendations to the Board concerning the engagement of independent public
accountants and the scope of the audit to be undertaken by such accountants.
 
    The Stock Option Committee is currently comprised of Mr. Long and is charged
with overseeing the stock option plans as they relate to employees other than
officers and directors of the Company.
 
    The Compensation Committee is currently comprised of Dr. Clark, Mr. Doerr,
Mr. Kramlich, Dr. McGuire, Mr. Sadler and Dr. Yamada. The Compensation Committee
reviews and, as it deems appropriate, recommends to the Board policies,
practices and procedures relating to the compensation of the officers and other
managerial employees and the establishment and administration of employee
benefit plans. The Committee exercises all authority under the Company's
employee equity incentive plans and advises and consults with the officers of
the Company regarding managerial personnel policies.
 
                                       52
<PAGE>
DIRECTOR COMPENSATION
 
    Directors do not receive any cash fees for their service on the Board or any
Board committee, but they are entitled to reimbursement of all reasonable
out-of-pocket expenses incurred in connection with their attendance at Board and
Board committee meetings. Upon completion of this offering, all Board members
are eligible to receive stock options under the 1996 Plan, and outside directors
receive stock options pursuant to automatic grants of stock options under the
1996 Plan. In July 1998, the Company granted to each of Drs. McGuire and Yamada
an option to purchase 30,000 shares of its Common Stock under the 1996 Plan with
an exercise price equal to $7.00 per share, the fair market value of the
Company's Common Stock on that date as determined by the Board of Directors
after taking into account the Company's financial results and prospects. The
1996 Plan provides that each outside director will receive an option to purchase
5,000 shares of Common Stock annually.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    Dr. Yamada, a member of the Compensation Committee, is a director and
executive officer of SmithKline Beecham, which, through its subsidiary
SmithKline Labs, beneficially owns 8.1% of the Company's Common Stock, and has
entered into the Services Agreement and certain other agreements with the
Company. Dr. McGuire, a member of the Compensation Committee, is the Chairman
and Chief Executive Officer of United HealthCare, which, with its subsidiaries
and affiliates, beneficially owns approximately 16.2% of the Company's Common
Stock, and has entered into the United HealthCare Agreement and certain other
agreements with the Company. See "Certain Transactions." No interlocking
relationship exists between the Board or Compensation Committee and the board of
directors or compensation committee of any other company, nor has any such
interlocking relationship existed in the past.
 
LIMITATION ON LIABILITY AND INDEMNIFICATION MATTERS
 
    Section 102 of the Delaware General Corporation Law ("DGCL") authorizes a
Delaware corporation to include a provision in its certificate of incorporation
limiting or eliminating the personal liability of its directors to the
corporation and its stockholders for monetary damages for breach of the
directors' fiduciary duty of care. The duty of care generally requires that,
when acting on behalf of the corporation, directors exercise an informed
business judgment based on all material information reasonably available to
them. Absent the limitations authorized by such provision, directors are
accountable to corporations and their stockholders for monetary damages for
conduct constituting gross negligence in the exercise of their duty of care.
Although Section 102 of the DGCL does not change a director's duty of care, it
enables corporations to limit available relief to equitable remedies such as
injunction or rescission. The Company's Certificate of Incorporation and Bylaws
include provisions that limit or eliminate the personal liability of its
directors to the fullest extent permitted by Section 102 of the DGCL.
Consequently, a director or officer will not be personally liable to the Company
or its stockholders for monetary damages for breach of fiduciary duty as a
director, except for (i) any breach of the director's duty of loyalty to the
Company or its stockholders, (ii) acts or omissions not in good faith or that
involve intentional misconduct or a knowing violation of law, (iii) unlawful
payments of dividends or unlawful stock repurchases, redemptions or other
distributions and (iv) any transaction from which the director derived an
improper personal benefit.
 
    The Company's Certificate of Incorporation provides that the Company will
indemnify, to the fullest extent permitted by law any person made or threatened
to be made a party to any action or proceeding, whether civil, criminal,
administrative or investigative, by reason of the fact that such person or such
person's testator or intestate is or was a director or officer of the Company or
any predecessor or serves or served at any other enterprise as a director,
officer or employee at the request of the Company.
 
    The Company's Bylaws provide that the Company will, to the maximum extent
and in the manner permitted by the DGCL, indemnify each person who (i) is or was
a director or officer of the Company or
 
                                       53
<PAGE>
any subsidiary of the Company, (ii) is or was serving at the request of the
Company as a director or officer of another corporation, partnership, joint
venture, trust or other enterprise, or (iii) was a director or officer of a
corporation that was a predecessor corporation of the Company or any of its
subsidiaries or of another enterprise at the request of such predecessor
corporation or subsidiary, against expenses (including attorneys' fees),
judgments, fines, settlements, and other amounts actually and reasonably
incurred in connection with any proceeding arising by reason of the fact that
such person is or was an agent of the Company.
 
    The Company intends to enter into agreements to indemnify its directors and
executive officers, in addition to indemnification provided for in the Company's
Certificate of Incorporation and Bylaws. These agreements, among other things,
indemnify the Company's directors and executive officers for certain expenses
(including attorneys' fees), judgments, fines, penalties and settlement amounts
incurred by any such person in any action or proceeding, including any action by
or in the right of the Company, arising out of such person's services as a
director, officer, employee, agent or fiduciary of the Company, any subsidiary
of the Company or any other company or enterprise to which the person provides
services at the request of the Company. In addition, the Company intends to
obtain directors' and officers' insurance providing indemnification for certain
of the Company's directors, officers and employees for certain liabilities. The
Company believes that these indemnification provisions and agreements are
necessary to attract and retain qualified directors and officers.
 
    The limited liability and indemnification provisions in the Company's
Certificate of Incorporation and Bylaws may discourage stockholders from
bringing a lawsuit against directors for breach of their fiduciary duty
(including breaches resulting from grossly negligent conduct) and may have the
effect of reducing the likelihood of derivative litigation against directors and
officers, even though such an action, if successful, might otherwise benefit the
Company and it stockholders. Furthermore, a stockholder's investment in the
Company may be adversely affected to the extent the Company pays the costs of
settlement and damage awards against directors and officers of the Company
pursuant to the indemnification provisions in the Company's Certificate of
Incorporation and Bylaws.
 
    At present, there is no pending or threatened litigation or proceeding
involving any director, officer or employee of the Company where indemnification
is expected to be required or permitted, and the Company is not aware of any
threatened litigation or proceeding that might result in a claim for such
indemnification.
 
                                       54
<PAGE>
EXECUTIVE COMPENSATION
 
    The following table sets forth information concerning the compensation
earned for services rendered to the Company in 1997 in all capacities by the
Company's Chief Executive Officer, the Company's former Chief Executive Officer
and the Company's four other most highly compensated executive officers who
earned more than $100,000 in 1997 and were serving as executive officers at the
end of 1997 (collectively, the "Named Executive Officers").
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                            LONG-TERM
                                                                           COMPENSATION
                                                                           ------------
                                                                              AWARDS
                                                    ANNUAL COMPENSATION    ------------
                                                                            SECURITIES     ALL OTHER
                                                    --------------------    UNDERLYING    COMPENSATION
           NAME AND PRINCIPAL POSITION              SALARY($)   BONUS($)    OPTIONS(#)       ($)(1)
- --------------------------------------------------  ---------   --------   ------------   ------------
<S>                                                 <C>         <C>        <C>            <C>
W. Michael Long(2)
  Chief Executive Officer.........................    234,849        --     3,250,000(6)     2,766
Michael K. Hoover(3)
  President.......................................    175,000    75,000            --        6,664
David Schnell(4)
  Former President and CEO........................         --        --            --           --
Pavan Nigam
  Vice President, Engineering.....................    200,004    50,000       125,000        5,571
Denise Shea(5)
  Former General Counsel..........................    135,312        --        55,000        2,268
Kallen Chan
  Controller......................................    118,750        --        20,000        4,073
</TABLE>
 
- ---------
 
(1) Represents life, medical and long-term disability insurance premiums paid by
    the Company.
 
(2) Mr. Long joined the Company as Chief Executive Officer in July 1997, and was
    paid at a rate of $500,000 per year.
 
(3) Mr. Hoover served as President and Chief Executive Officer of ActaMed
    Corporation until it was acquired by the Company in May 1998.
 
(4) Mr. Schnell, a former general partner of Kleiner Perkins Caufield & Byers,
    served on an interim basis as President and Chief Executive Officer of the
    Company from February 1996 to July 1997. In exchange for Mr. Schnell's
    services and other services provided by KPCB, KPCB received a warrant to
    purchase 1,000,000 shares of Series B Preferred Stock of the Company which
    has been converted into a warrant to purchase 1,000,000 shares of Common
    Stock.
 
(5) Ms. Shea became Assistant General Counsel of the Company on July 8, 1998.
 
(6) Includes 750,000 shares of Common Stock subject to a warrant granted to Mr.
    Long upon the commencement of his employment with the Company. See "--
    Employment Agreements."
 
                                       55
<PAGE>
               OPTION GRANTS DURING YEAR ENDED DECEMBER 31, 1997
 
    The following table sets forth certain information for the year ended
December 31, 1997 with respect to grants of stock options to each of the Named
Executive Officers:
 
<TABLE>
<CAPTION>
                                                                                          POTENTIAL REALIZABLE
                                                     INDIVIDUAL GRANTS                            VALUE
                                      ------------------------------------------------   AT ASSUMED ANNUAL RATES
                                       NUMBER OF   % OF TOTAL                                OF STOCK PRICE
                                      SECURITIES     OPTIONS                                  APPRECIATION
                                      UNDERLYING   GRANTED TO   EXERCISE                   FOR OPTION TERM(4)
                                        OPTIONS     EMPLOYEES   PRICE PER  EXPIRATION   -------------------------
NAME                                  GRANTED(1)   IN 1997(2)   SHARE(3)      DATE          5%           10%
- ------------------------------------  -----------  -----------  ---------  -----------  -----------  ------------
<S>                                   <C>          <C>          <C>        <C>          <C>          <C>
W. Michael Long.....................   2,500,000         45.3%  $    0.25    07/22/07   $   393,059  $    996,089
                                         750,000(5)       13.6       2.00     7/10/00       943,342     2,390,614
Michael K. Hoover...................          --           --          --          --            --            --
David Schnell.......................          --           --          --          --            --            --
Pavan Nigam.........................     125,000          2.3        1.00    10/14/07        78,611       199,218
Denise Shea.........................      55,000          1.0        0.20    02/18/07         6,917        17,531
Kallen Chan.........................      20,000          0.4        0.20    02/18/07         2,515         6,375
</TABLE>
 
- ---------
 
(1) Options granted in 1997 were granted under the Company's 1996 Stock Plan.
    With respect to the options granted to Mr. Nigam, Ms. Shea and Mr. Chan, 25%
    of the shares vest on the first anniversary of the date of grant and 1/48 of
    the shares vest each month thereafter. With respect to the options granted
    to Mr. Long, 25% of the shares vested immediately upon grant and, beginning
    on the first anniversary of the date of grant, 1/48 of the shares vest each
    month thereafter. These options have a term of 10 years. See "-- Employee
    Benefit Plans" for a description of the material terms of these options.
 
(2) The Company granted options or warrants to purchase 5,510,850 shares of
    Common Stock to employees during 1997.
 
(3) Options were granted at an exercise price equal to the fair market value of
    the Company's Common Stock, as determined in good faith by the Board of
    Directors. The Board of Directors determined the fair market value based on
    the Company's financial results and prospects, the share price derived for
    arms-length transactions, and independent evaluations conducted by valuation
    experts.
 
(4) Potential realizable values are net of exercise price before taxes, and are
    based on the assumption that the Common Stock of the Company appreciates at
    the annual rate shown (compounded annually) from the date of grant until the
    expiration of the ten-year term. These numbers are calculated based on
    Securities and Exchange Commission requirements and do not reflect the
    Company's projection or estimate of future stock price growth.
 
(5) The Company issued Mr. Long a warrant to purchase 750,000 shares of the
    Company's Series B Preferred Stock upon the commencement of his employment
    with the Company. This warrant is currently exercisable for 750,000 shares
    of Common Stock. Shares issuable upon exercise of this warrant are subject
    to a two-year right of repurchase held by the Company that lapses ratably
    through July 1999. See "-- Employment Agreements."
 
                                       56
<PAGE>
                             YEAR-END OPTION VALUES
 
    The following table sets forth information with respect to the Named
Executive Officers concerning exercisable and unexercisable options held as of
December 31, 1997:
 
<TABLE>
<CAPTION>
                                                               NUMBER OF SECURITIES
                                                              UNDERLYING UNEXERCISED       VALUE OF UNEXERCISED
                                                                    OPTIONS AT             IN-THE-MONEY OPTIONS
                                                               DECEMBER 31, 1997(1)      AT DECEMBER 31, 1997(2)
                                                            --------------------------  --------------------------
NAME                                                        EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
- ----------------------------------------------------------  -----------  -------------  -----------  -------------
<S>                                                         <C>          <C>            <C>          <C>
W. Michael Long...........................................     625,000      1,875,000    $ 468,750     $1,406,250
                                                               750,000(3)           --          --             --
Michael K. Hoover.........................................     893,268             --      561,119             --
David Schnell.............................................          --             --           --             --
Pavan Nigam...............................................          --        125,000           --             --
Denise Shea...............................................          --         55,000           --        $44,000
Kallen Chan...............................................          --         20,000           --        $16,000
</TABLE>
 
- ---------
 
(1) Except in the case of Mr. Hoover, options shown were granted under the 1996
    Stock Plan and are subject to vesting as described in footnote (1) to the
    option grant table above. Options held by Mr. Hoover were granted under the
    ActaMed 1992, 1993 Class B Common and 1994 Stock Option Plans, which were
    assumed by the Company upon the consummation of the acquisition of ActaMed.
    All of Mr. Hoover's shares are fully vested.
 
(2) Based on an assumed value of $1.00 per share, the deemed fair market value
    as of December 31, 1997 as determined by the Board, and net of the option
    exercise price.
 
(3) Represents shares issuable upon exercise of a warrant issued to Mr. Long
    upon commencement of his employment with the Company. See "-- Employment
    Agreements."
 
EMPLOYMENT AGREEMENTS
 
    The Company's ActaMed subsidiary has an employment agreement with Michael K.
Hoover, Healtheon's President. The agreement provides for a base salary of
$85,000, and imposes a covenant not to compete upon Mr. Hoover for a period of
one year following the termination of his employment.
 
    In July 1997, the Company and Mr. Long entered into an employment agreement
pursuant to which Mr. Long became the President and Chief Executive Officer of
the Company. The Company granted Mr. Long an option to purchase 2,500,000 shares
of Common Stock, 25% of which vested immediately, and the remainder of which
vests ratably each month during the second through the fourth year. In addition,
Mr. Long purchased 250,000 shares for $500,000, $499,750 of which was
represented by a promissory note to the Company, and was issued a warrant to
purchase an additional 750,000 shares at an exercise price of $2.00 per share.
The shares issuable upon exercise of this warrant are subject to a right of
repurchase commencing on Mr. Long's employment start date and lapsing as to
31,250 shares each month. The employment agreement provides that should Mr. Long
leave the Company because he is no longer offered a position with similar
responsibility due to a change of control of the Company, Mr. Long's option
vests immediately as to 625,000 shares and the Company's repurchase right
lapses. Additionally, if the Company terminates Mr. Long's employment without
cause, he will receive six months' salary in installments, his option will vest
immediately as to 625,000 shares and the Company's repurchase right will lapse.
 
EMPLOYEE BENEFIT PLANS
 
    1996 STOCK PLAN.  In February 1996 the Board adopted, and the Company's
stockholders approved, the 1996 Plan. The Company initially reserved for
issuance 9,000,000 shares of Common Stock under the 1996 Plan. In March 1998,
the Board and the stockholders each approved an amendment to the 1996 Plan
 
                                       57
<PAGE>
   
to increase the number of shares of Common Stock issuable thereunder to
10,000,000 shares. In July 1998, the Board approved and in October the
stockholders approved an amendment to increase the number of shares of Common
Stock issuable under the 1996 Plan to 15,000,000 shares plus annual increases
equal to the lesser of (i) 5% of the outstanding shares or (ii) a lesser amount
determined by the Board. Unless terminated sooner, the 1996 Plan will terminate
automatically in February 2006. The 1996 Plan provides for the discretionary
grant of incentive stock options, within the meaning of Section 422 of the
Internal Revenue Code of 1986, as amended (the "Code"), to employees and for the
grant of nonstatutory stock options and stock purchase rights ("SPRs") to
employees, directors and consultants. The 1996 Plan also provides for annual
grants of options to purchase 5,000 shares of Common Stock to each of the
outside directors.
    
 
    The 1996 Plan may be administered by the Board or a committee thereof (as
applicable, the "Administrator"). The Administrator has the power to determine
the terms of the options or SPRs granted, including the exercise price of the
options or SPRs, the number of shares subject to each option or SPR, the
exercisability thereof, and the form of consideration payable upon such
exercise. In addition, the Administrator has the authority to amend, suspend or
terminate the 1996 Plan, provided that no such action may affect any share of
Common Stock previously issued and sold or any option previously granted under
the 1996 Plan.
 
    The exercise price of all incentive stock options granted under the 1996
Plan must be at least equal to the fair market value of the Common Stock on the
date of grant. The exercise price of nonstatutory stock options and SPRs granted
under the 1996 Plan is determined by the Administrator, but with respect to
nonstatutory stock options intended to qualify as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the exercise
price must be at least equal to the fair market value of the Common Stock on the
date of grant. With respect to any participant who owns stock possessing more
than 10% of the voting power of all classes of the Company's outstanding capital
stock, the exercise price of any incentive stock option granted must be at least
equal 110% of the fair market value on the grant date and the term of such
incentive stock option must not exceed five years. The term of all other options
granted under the 1996 Plan may not exceed ten years. Options generally vest as
to 25% at the end of the first year and monthly thereafter over a period of
three years so that the entire option is vested after four years, based upon the
optionee's continued employment or consulting relationship with the Company.
 
    In the case of SPRs, unless the Administrator determines otherwise, the
restricted stock purchase agreement will grant the Company a repurchase option
exercisable upon the voluntary or involuntary termination of the purchaser's
employment or consulting relationship with the Company for any reason (including
death or disability). The purchase price for shares repurchased pursuant to a
restricted stock purchase agreement must be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company. The repurchase option will lapse at a rate determined by the
Administrator.
 
    Options and SPRs granted under the 1996 Plan are generally not transferable
by the optionee, and each option and SPR is exercisable during the lifetime of
the optionee only by such optionee. Options granted under the 1996 Plan must
generally be exercised within 30 days after the end of optionee's status as an
employee, director or consultant of the Company, or within one year after such
optionee's termination by disability or death, respectively, but in no event
later than the expiration of the option's term.
 
    The 1996 Plan provides that, in the event of a merger of the Company with or
into another corporation, each outstanding option and SPR must be assumed or an
equivalent option substituted by the successor corporation. If the outstanding
options and SPRs are not assumed or substituted by the successor corporation,
such outstanding options and SPRs will terminate.
 
    ACTAMED STOCK OPTION PLANS.  In connection with its acquisition of ActaMed
(the "Merger"), the Company assumed the outstanding options of ActaMed under the
following ActaMed stock option plans
 
                                       58
<PAGE>
(collectively, the "ActaMed Plans"): ActaMed Corp. 1992 Stock Option Plan,
ActaMed Corp. 1993 Class B Common Stock Option Plan, ActaMed Corp. 1994 Stock
Option Plan, ActaMed Corp. 1995 Stock Option Plan, ActaMed Corp. 1996 Stock
Option Plan, ActaMed Corp. 1997 Stock Option Plan and ActaMed Corp. 1996
Director Stock Option Plan. The following directors and executive officers of
the Company held ActaMed options that were assumed by the Company: Michael
Hoover (options to purchase 1,424,216 shares of ActaMed common stock), Nancy Ham
(options to purchase 250,000 shares of ActaMed common stock), J. Philip Hardin
(options to purchase 80,000 shares of ActaMed common stock), and John R. Hughes,
Jr. (options to purchase 220,000 shares of ActaMed common stock). As a result of
the merger, each option to purchase shares of ActaMed common stock now
represents an option to purchase a number of shares of Healtheon Common Stock
equal to .6272 times the number of shares of ActaMed common stock originally
subject to the option at the per share exercise price equal to the original per
share exercise price divided by .6272. The Company will make no further grants
under the ActaMed Plans. However, each assumed ActaMed option continues to have
and remains subject to substantially the terms and conditions of the applicable
ActaMed Plan under which such option was originally granted as in effect
immediately prior to the Merger. Generally, options granted under the ActaMed
Plans will automatically terminate ten years following their adoption, and may
be administered by the Board of Directors or a committee of the Board (as
applicable, the "Administrator"). Options granted under the ActaMed Plans
generally are not transferrable by the optionee, and must generally be exercised
within 30 days after the end of the optionee's status as an employee or
consultant of the Company or within 90 days after such optionee's termination by
disability or death, respectively, but in no event later than the expiration of
the option's term. Generally, in the event of any merger, sale of stock,
consolidation, liquidation, recapitalization, reclassification, stock split up,
combination of shares, share exchange, stock dividend, or transaction having a
similar effect, where the Company does not remain in existence, the
Administrator may (i) to the extent such options have not previously been
accelerated, declare that all ActaMed options shall vest in full and be
exercisable for a period of thirty (30) days following written notice from the
Administrator, after which all ActaMed options shall terminate, (ii) provide
that all ActaMed options shall be assumed by the successor corporation, or (iii)
a combination of (i) and (ii).
 
   
    1998 EMPLOYEE STOCK PURCHASE PLAN.  The Company's 1998 Employee Stock
Purchase Plan (the "1998 Purchase Plan") was adopted by the Board in September
1998 and approved by the stockholders in October 1998. A total of 1,000,000
shares of Common Stock has been reserved for issuance under the 1998 Purchase
Plan, plus annual increases equal to the least of (i) 500,000 shares, (ii) .5%
of the outstanding shares on such date or (iii) a lesser amount determined by
the Board.
    
 
    The 1998 Purchase Plan, which is intended to qualify under Section 423 of
the Code, contains consecutive, overlapping, twenty-four month offering periods.
Each offering period includes four six-month purchase periods. The offering
periods generally start on the first trading day on or after May 1 and November
1 of each year, except for the first such offering period which commences on the
first trading day on or after the effective date of this offering and ends on
the last trading day on or before April 30, 2000.
 
    Employees are eligible to participate if they are customarily employed by
the Company or any participating subsidiary for at least 20 hours per week and
more than five months in any calendar year. However, any employee who (i)
immediately after grant would own stock possessing 5% or more of the total
combined voting power or value of all classes of the capital stock of the
Company, or (ii) whose rights to purchase stock under all employee stock
purchase plans of the Company accrues at a rate which exceeds $25,000 worth of
stock for each calendar year may not be granted an option to purchase stock
under the 1998 Purchase Plan. The 1998 Purchase Plan permits each participant to
purchase Common Stock through payroll deductions of up to 15% of the
participant's "compensation." Compensation is defined as the participant's base
straight time gross earnings and commissions but excludes payments for overtime,
shift premium, incentive compensation, incentive payments, bonuses and other
compensation. The maximum number of shares a participant may purchase during a
single purchase period is 5,000 shares.
 
                                       59
<PAGE>
    Amounts deducted and accumulated by the participant are used to purchase
shares of Common Stock at the end of each purchase period. The price of stock
purchased under the 1998 Purchase Plan is 85% of the lower of the fair market
value of the Common Stock (i) at the beginning of the offering period or (ii) at
the end of the purchase period. In the event the fair market value at the end of
a purchase period is less than the fair market value at the beginning of the
offering period, the participants will be withdrawn from the current offering
period following exercise and automatically re-enrolled in a new offering
period. The new offering period will use the lower fair market value as of the
first date of the new offering period to determine the purchase price for future
purchase periods. Participants may end their participation at any time during an
offering period, and they will be paid their payroll deductions to date.
Participation ends automatically upon termination of employment with the
Company.
 
    Rights granted under the 1998 Purchase Plan are not transferable by a
participant other than by will, the laws of descent and distribution, or as
otherwise provided under the 1998 Purchase Plan. The 1998 Purchase Plan provides
that, in the event of a merger of the Company with or into another corporation
or a sale of substantially all of the Company's assets, each outstanding option
may be assumed or substituted for by the successor corporation. If the successor
corporation refuses to assume or substitute for the outstanding options, the
offering period then in progress will be shortened and a new exercise date will
be set. The 1998 Purchase Plan will terminate in 2008. The Board has the
authority to amend or terminate the 1998 Purchase Plan, except that no such
action may adversely affect any outstanding options under the 1998 Purchase
Plan. Notwithstanding anything to the contrary, the Board may alter the purchase
price for any offering period or shorten an offering period at any time without
consent of the stockholders or of any participants.
 
    401(k) PLAN.  The Company participates in a tax-qualified employee savings
and retirement plan (the "401(k) Plan") which covers all of the Company's
full-time employees who have completed three months of service. Pursuant to the
401(k) Plan, eligible employees may defer up to 20% of their pre-tax earnings,
subject to the Internal Revenue Service's annual contribution limit. The 401(k)
Plan permits additional discretionary matching contributions by the Company on
behalf of all participants in the 401(k) Plan in such a percentage amount as may
be determined annually by the Board. To date, the Company has made no such
matching contributions. The 401(k) Plan is intended to qualify under Section 401
of the Code, as amended, so that contributions by employees or by the Company to
the 401(k) Plan, and income earned on plan contributions, are not taxable to
employees until withdrawn from the 401(k) Plan, and income earned on plan
contributions, are not taxable to employees until withdrawn from the 401(k)
Plan, and so that contributions by the Company, if any, will be deductible by
the Company when made. The trustee under the 401(k) Plan, at the direction of
each participant, invests the assets of the 401(k) Plan in any of a number of
investment options.
 
                                       60
<PAGE>
                              CERTAIN TRANSACTIONS
 
    Since December 26, 1995, the Company's inception date, there has not been
nor is there currently proposed any transaction or series of similar
transactions to which the Company or any of its subsidiaries was or is to be a
party in which the amount involved exceeds $60,000 and in which any director,
executive officer, holder of more than 5% of the Common Stock of the Company or
any member of the immediate family of any of the foregoing persons had or will
have a direct or indirect material interest other than (i) compensation
agreements and other arrangements, which are described where required in
"Management," and (ii) the transactions described below.
 
ACTAMED CORPORATION ACQUISITION
 
    On May 19, 1998, the Company completed the acquisition of ActaMed by means
of a merger of a wholly-owned subsidiary of the Company with and into ActaMed,
with ActaMed surviving as a wholly owned subsidiary of the Company (the
"Merger"). Pursuant to the Merger, 23,271,355 shares of the Company's Common
Stock were issued in exchange for all of the issued and outstanding capital
stock of ActaMed, and all options to purchase ActaMed Common Stock were assumed
by the Company. The Merger was treated as a tax-free reorganization within the
meaning of Section 368(a) of the Internal Revenue Code of 1996, as amended, and
as a "pooling-of-interests" transaction for accounting and financial reporting
purposes. All of the then outstanding shares of Preferred Stock of the Company
were converted into shares of Common Stock of the Company upon the consummation
of the Merger.
 
    The Company and certain stockholders of the Company who together hold a
majority of the outstanding shares of Common Stock of the Company entered into a
Voting Agreement in connection with the Merger (the "Voting Agreement"). Among
other things, the Voting Agreement requires each of the signatories thereto to
vote its shares in favor of the election of four directors nominated by those
signatories who were ActaMed shareholders prior to the Merger and four directors
nominated by those signatories who were Healtheon stockholders prior to the
Merger. The Voting Agreement terminates upon the consummation of this offering.
 
TRANSACTIONS WITH DIRECTORS, EXECUTIVE OFFICERS AND 5% STOCKHOLDERS
 
   
    On January 26, 1996, the Company sold 10,285,000 shares of its Series A
Preferred Stock for $.50 per share. The purchasers of the Series A Preferred
Stock included, among others, Dr. James H. Clark (3,500,000 shares for a
purchase price of $1.75 million), Kleiner Perkins Caufield & Byers VII
(2,999,500 shares for a purchase price of $1.5 million), KPCB VII Founders Fund
(325,500 shares for a purchase price of $162,750), KPCB Life Sciences Zaibatsu
Fund II (175,000 shares for a purchase price of $87,500) and New Enterprise
Associates VI, Limited Partnership ("New Enterprise Associates VI") (2,000,000
shares for a purchase price of $1.0 million). KPCB VII Founders Fund, KPCB Life
Sciences Zaibatsu Fund II and Kleiner Perkins Caufield & Byers VII, along with
KPCB VII Associates and KPCB Java Fund, are affiliated entities. L. John Doerr,
a director of the Company, is a general partner of KPCB VII Associates and the
general partner of KPCB Life Sciences Zaibatsu Fund II. Mr. Doerr disclaims
beneficial ownership of the securities held by such entities except for his
proportional interest therein. C. Richard Kramlich, a director of the Company,
is a general partner of New Enterprise Associates VI. Mr. Kramlich disclaims
beneficial ownership of the securities held by such entity except for his
proportional interest therein.
    
 
   
    On January 26, 1996, the Company sold 1,000,000 shares of its Common Stock
for $.05 per share. The purchasers of the Common Stock included Dr. Clark
(500,000 shares for a purchase price of $25,000), Kleiner Perkins Caufield &
Byers VII (428,500 shares for a purchase price of $21,425), KPCB VII Founders
Fund (46,500 shares for a purchase price of $2,325) and KPCB Life Sciences
Zaibatsu Fund II (25,000 shares for a purchase price of $1,250).
    
 
    On October 1, 1996, the Company sold 3,000,000 shares of its Series B
Preferred Stock for $2.00 per share. The purchasers of the Series B Preferred
Stock included, among others, Dr. Clark (1,125,000 shares for a purchase price
of $2.3 million), Kleiner Perkins Caufield & Byers VII (1,068,750 shares for a
 
                                       61
<PAGE>
purchase price of $2.1 million), KPCB Life Sciences Zaibatsu Fund II (56,250
shares for a purchase price of $112,500) and New Enterprise Associates VI
(500,000 shares for a purchase price of $1.0 million).
 
   
    In related transactions, on November 1, 1996, the Company issued a warrant
to purchase 1,000,000 shares of Series B Preferred Stock with an exercise price
of $2.00 per share to each of Clark Ventures, as an incentive for Dr. Clark to
continue to provide services to the Company, and KPCB VII Associates, in
consideration for services provided to the Company by David Schnell, a former
general partner of KPCB, in his capacity as President and CEO. The warrant
issued to KPCB VII Associates was valued at $504,900. Clark Ventures
subsequently exercised its warrant on May 1, 1998 for an aggregate purchase
price of $2.0 million. Clark Ventures is controlled by Dr. Clark. On July 11,
1997 the Company issued 250,000 shares of Series B Preferred Stock for a
purchase price of $.5 million and a warrant to purchase 750,000 shares of Series
B Stock with an exercise price of $2.00 per share to W. Michael Long. See "--
Employment Agreements." In order to purchase the 250,000 shares of Preferred
Stock, Dr. Long borrowed $499,750 from the Company pursuant to a one-year
interest-free full recourse promissory note. The note was paid in full on June
30, 1998.
    
 
    Between April 15, 1997 and May 6, 1997, the Company borrowed an aggregate of
$2.0 million at an annual interest rate of 6% pursuant to promissory notes (each
of which included a right to receive certain Series B Preferred Stock warrants
at the time of repayment or upon cancellation of such note) in a bridge
financing transaction (the "Bridge Financing"). The lenders in the Bridge
Financing included, among others, Dr. Clark (who lent $765,750), Kleiner Perkins
Caufield & Byers VII (which lent an aggregate of $727,463), KPCB Life Sciences
Zaibatsu Fund II (which lent an aggregate of $38,288) and New Enterprise
Associates VI (which lent $312,500). On July 1, 1997 the promissory notes were
cancelled in consideration for the issuance of Series C Preferred Stock (as
described below), and the Series B Preferred Stock warrants were issued as
follows: Dr. Clark received a warrant to purchase 17,229 shares, Kleiner Perkins
Caufield & Byers VII received a warrant to purchase 27,891 shares, KPCB Life
Sciences Zaibatsu Fund II received a warrant to purchase 1,468 and New
Enterprise Associates VI received a warrant to purchase 11,979 shares. All of
the Series B Warrants have an exercise price of $2.00 per share. Dr. Clark
subsequently exercised his warrant on May 1, 1998 for an aggregate purchase
price of $34,458.
 
    On July 1, 1997, the Company sold 2,400,000 shares of its Series C Preferred
Stock for $2.50 per share. The purchasers of the Series C Preferred Stock
included, among others, Dr. Clark (612,600 shares for a purchase price of $1.5
million, including cancellation of the $765,750 promissory note given in the
Bridge Financing discussed above), Kleiner Perkins Caufield & Byers VII (290,985
shares for cancellation of the $727,463 in promissory notes given in the Bridge
Financing discussed above), KPCB Java Fund (306,300 shares for a purchase price
of $765,750), KPCB Life Sciences Zaibatsu Fund II (15,315 shares for
cancellation of the $38,288 in promissory note given in the Bridge Financing
discussed above) and New Enterprise Associates VI (250,000 shares for a purchase
price of $625,000 including cancellation of the $312,500 promissory note given
in the Bridge Financing discussed above).
 
   
    Between October 17, 1997 and December 19, 1997, the Company sold 4,807,692
shares of its Series D Preferred Stock for $5.20 per share. The purchasers of
the Series D Preferred Stock included, among others, Clark Ventures (1,730,769
shares for a purchase price of $9.0 million), Kleiner Perkins Caufield & Byers
VII (432,693 shares for a purchase price of $2.3 million), KPCB Java Fund
(480,769 shares for a purchase price of $2.5 million), KPCB Life Sciences
Zaibatsu Fund II (48,077 shares for a purchase price of $250,000), Kathy Clark
(96,154 shares for a purchase price of $.5 million), Michael James Clark Trust
(96,154 shares for a purchase price of $.5 million) and New Enterprise
Associates VI, Limited Partnership (576,923 shares for a purchase price of $3.0
million). Kathy Clark and Michael James Clark are adult children of Dr. Clark.
    
 
    On May 19, 1998, in connection with the ActaMed Merger, each share of
Preferred Stock of the Company converted into one share of Common Stock and each
outstanding warrant to purchase shares of the Company's Preferred Stock
converted into a warrant to purchase shares of the Company's Common Stock.
 
                                       62
<PAGE>
    On November 21, 1996, ActaMed entered into an Amended and Restated
Development Agreement with The SFA Limited Partnership ("SFA") under which
ActaMed granted SFA a license to ActaMed's object broker technology that
supports the GMPI functionality. SFA is controlled by P. E. Sadler, a director
of the Company. SFA was given the right to use such technology outside the
healthcare industry and must pay royalties on any revenues that would be derived
from such use. This agreement expires in November 2001. To date, no royalties
have become payable to the Company or ActaMed as a result of this agreement.
 
    In September 1997, ActaMed received a loan from NationsBank, N.A. in the
aggregate principal amount of $2.1 million, all of which was personally
guaranteed by P. E. Sadler, a director of the Company. As a result of ActaMed's
pledging a note receivable from IBM to NationsBank, N.A. in November 1997, Mr.
Sadler was released from the guarantee. In December 1997, ActaMed obtained a
line of credit in the aggregate principal amount of $2.3 million from
NationsBank, N.A. In exchange for a personal guarantee of this line of credit by
Mr. Sadler, ActaMed granted to Mr. Sadler a security interest in all of its
tangible assets other than the IBM note receivable. Upon the completion of the
acquisition of ActaMed by the Company, Mr. Sadler's guarantee was released. This
line of credit was repaid by the Company on July 31, 1998.
 
    From 1995 through June 1998, up to three companies affiliated with Mr.
Sadler had agreements with ActaMed whereby ActaMed provided office space, phone
facilities and computer network support. In 1995, 1996, 1997 and 1998 the
Company was paid approximately $256,000, $215,000, $137,000 and $32,000,
respectively, under such agreements.
 
CERTAIN BUSINESS RELATIONSHIPS
 
    Prior to the acquisition of ActaMed by the Company, ActaMed entered into a
series of agreements (the "SmithKline Agreements") with SmithKline Labs, which
agreements were assumed by the Company in the ActaMed Merger. Pursuant to the
SmithKline Agreements, ActaMed agreed to purchase certain intangible assets (the
"SmithKline Assets") located in four geographic regions, received a technology
license relating to the SmithKline Assets and agreed to provide certain
continuing development and network services to SmithKline Labs. In December
1997, SmithKline Labs transferred a portion of the SmithKline Assets from the
first region to ActaMed in exchange for $2.0 million in cash and 3,695,652
shares of ActaMed Preferred Stock (which shares were converted into 2,317,913
shares of the Company's Common Stock in connection with the ActaMed Merger). In
March 1998, SmithKline Labs transferred the SmithKline Assets from the second
region to ActaMed in exchange for 1,217,391 shares of ActaMed Preferred Stock
(which shares were converted into 763,548 shares of the Company's Common Stock
in connection with the ActaMed Merger). In June 1998, SmithKline Labs
transferred SmithKline Assets from the remaining two regions to the Company in
exchange for 1,336,209 shares of Common Stock.
 
    Also pursuant to one of the SmithKline Agreements (the "Services
Agreement"), the Company will perform laboratory test order and results services
to providers utilizing SmithKline Labs' laboratory services through SCAN.
SmithKline Labs is obligated to pay the Company a minimum of approximately $10.0
million in 1998 for laboratory test orders and results transactions. SmithKline
Labs may be required to pay the Company certain additional fees for transactions
processed by the Company in the event the number of providers accessing
SmithKline Labs' laboratory services through SCAN increases. SmithKline Labs
paid the Company $4.8 million in service and transaction fees during the first
six months of 1998 under the Services Agreement. The Services Agreement is
effective through December 2002, and provides for automatic successive two-year
renewals, subject to each party's right to elect not to renew the agreement no
later than 180 days (in the case of SmithKline Labs) or 360 days (in the case of
the Company) prior to the end of a term. In the event that the Company gives
notice of non-renewal, SmithKline Labs will be entitled to continued to receive
long-term order entry and results reporting services from the Company on a per
transaction pricing basis or, in the alternative, may require the Company to
develop a service for SmithKline that duplicates the services the Company had
been providing under the Services Agreement. Also under the Services Agreement,
SmithKline Labs is entitled, no more than once in any three consecutive month
periods, to request that the Company engage in certain exclusive
 
                                       63
<PAGE>
development work for SmithKline Labs. SmithKline Labs has agreed to use
reasonable efforts to use the Company as its "preferred provider" of electronic
eligibility verification and claims processing services. The Services Agreement
provides that the parties will negotiate new rates as of January 1, 2001 and
each two years thereafter. Pursuant to the Services Agreement, the renegotiated
rates must be competitive with the marketplace and must be no higher than the
lowest fees charged by the Company to similarly situated customers. See
Management's Discussion and Analysis -- Overview, and Note 3 of Notes to
Consolidated Financial Statements.
 
    In May 1998, the Company and SmithKline Labs entered into a letter agreement
under which the Company is obligated not to compete with SmithKline Labs in the
business of disease management, and has agreed to exclusively promote SmithKline
Labs' disease management products and services so long as SmithKline continues
to promote the Company as its preferred vendor. The Company also agreed that, in
the event it performs development work related to a disease management program
for one of its customers or itself, it will pay 50% of the profits from that
development work to SmithKline Labs.
 
    In March 1996, ActaMed acquired EDI Services, a wholly owned subsidiary of
United HealthCare, which had been formed by United HealthCare to deliver the
ProviderLink service to United HealthCare's provider network. In exchange for
EDI, ActaMed issued United HealthCare 10,344,828 shares of ActaMed Preferred
Stock valued at $21.0 million (which were converted into 6,488,276 shares of the
Company's Common Stock in connection with the Merger). In April 1996, ActaMed
also entered into a Services and License Agreement with United HealthCare that
granted United HealthCare a license to certain ActaMed technology and granted
ActaMed the responsibilities of managing the ProviderLink service and of
providing other information technology services to United HealthCare. United
HealthCare pays the Company fees based on the number of ProviderLink sites in
use and transactions processed. In 1996 and 1997, United HealthCare paid ActaMed
approximately $4.8 million and $7.3 million, respectively, related to services,
transaction and license fees. In the first six months of 1998, ActaMed (prior to
the Merger) and the Company were paid an aggregate of $4.6 million. The Company
is also obligated to provide certain support and maintenance services to United
HealthCare. The Services and License Agreement is effective through March 2001
subject to earlier termination in the event the Company fails to meet certain
network performance standards or otherwise breaches its material obligations
under the United HealthCare Agreement. The Service and License Agreement
provides that two years after the date of the agreement the parties will agree
on new prices that will be competitive with the marketplace. The Company and
United HealthCare are negotiating such new prices, and the Company anticipates
that the new prices will reduce the rates paid by United HealthCare. See
Management's Discussion and Analysis -- Overview, and Note 2 of Notes to
Consolidated Financial Statements. United HealthCare is a principal stockholder
of the Company and Dr. William McGuire, Chief Executive Officer and Chairman of
United HealthCare, is a director of the Company.
 
    In February 1998, ActaMed issued a one-year promissory note in the aggregate
principal amount of $2.0 million to HLM Partners VII, L.P. ("HLM"), which bore
interest at a rate of 10% per annum. United HealthCare was a limited partner of
HLM and a director of United HealthCare, was a partner of HLM. HLM was also a
stockholder of ActaMed. Both UHC and HLM are stockholders of the Company. This
note was repaid at the time of the Merger.
 
   
RELATED SALE
    
 
   
    Concurrent with the Underwritten Offering, the Company expects that it will
issue and sell shares of its Common Stock to an entity controlled by James H.
Clark, the Company's Chairman of the Board of Directors, which has indicated an
interest in purchasing shares of Common Stock. It is anticipated that this
entity will purchase 2,451,786 shares at a purchase price per share equal to the
initial public offering price, for an aggregate purchase price of approximately
$17.2 million based on an assumed initial public offering price of $7.00 per
share.
    
 
                                       64
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
   
    The following table sets forth certain information with respect to the
beneficial ownership of the Company's Common Stock as of August 31, 1998 and as
adjusted to reflect the sale of the shares of Common Stock offered in the
Underwritten Offering and the Related Sale by: (i) each person who is known by
the Company to beneficially own more than 5% of the Company's Common Stock, (ii)
each director of the Company, (iii) each of the Named Executive Officers and
(iv) all directors and executive officers of the Company as a group.
    
 
   
<TABLE>
<CAPTION>
                                                                                NUMBER OF           PERCENTAGE OF SHARES
                                                                                  SHARES           BENEFICIALLY OWNED(1)
                                                                               BENEFICIALLY  ----------------------------------
NAME OF BENEFICIAL OWNER                                                          OWNED      BEFORE OFFERING  AFTER OFFERING(2)
- -----------------------------------------------------------------------------  ------------  ---------------  -----------------
<S>                                                                            <C>           <C>              <C>
United HealthCare Corporation(3) ............................................     8,770,020          16.2%             13.7%
  William W. McGuire, M.D.(3) ...............................................     8,770,020          16.2              13.7
James H. Clark(4) ...........................................................     8,485,598          15.6              17.1(4)
  Clark Ventures(4) .........................................................     8,485,598          15.6              17.1(4)
  Monaco Partners, LP(4).....................................................     8,485,598          15.6              17.1(4)
Kleiner Perkins Caufield & Byers(5) .........................................     7,253,498          13.1              11.1
  L. John Doerr(5) ..........................................................     7,253,498          13.1              11.1
P. E. Sadler(6) .............................................................     5,001,993           9.2               7.8
SmithKline Beecham Clinical Laboratories, Inc.(7) ...........................     4,417,670           8.1               6.9
  Tadataka Yamada(7) ........................................................     4,417,670           8.1               6.9
New Enterprise Associates VI, L.P.(8) .......................................     3,338,902           6.2               5.2
  C. Richard Kramlich(8) ....................................................     3,338,902           6.2               5.2
W. Michael Long(9)...........................................................     1,781,250           3.2               2.7
Integral Capital Partners, L.P. .............................................     1,088,462           2.0               1.7
Michael K. Hoover(10)........................................................       888,268           1.6               1.4
Pavan Nigam(11)..............................................................       501,250             *                 *
David Schnell ...............................................................       495,000             *                 *
Denise Shea(12)..............................................................       147,917             *                 *
Kallen Chan(13)..............................................................        58,333             *                 *
All officers and directors as a group (23 persons)(14).......................    43,007,879          74.6              68.1
</TABLE>
    
 
- ----------
 
   * Less than one percent
 
   
 (1) The number and percentage of shares beneficially owned are based on
     54,317,201 shares of Common Stock outstanding as of August 31, 1998, and
     64,056,487 shares outstanding after the Underwritten Offering and the
     Related Sale. Beneficial ownership is determined in accordance with the
     rules and regulations of the Securities and Exchange Commission. Shares of
     Common Stock subject to options or warrants that are currently exercisable
     or exercisable within 60 days of August 31, 1998 are deemed to be
     outstanding and beneficially owned by the person holding such options or
     warrants for the purpose of computing the number of shares beneficially
     owned and the percentage ownership of such person, but are not deemed to be
     outstanding for the purpose of computing the percentage ownership of any
     other person. Except as indicated in the footnotes to this table, and
     subject to applicable community property laws, such persons have sole
     voting and investment power with respect to all shares of the Company's
     Common Stock shown as beneficially owned by them.
    
 
   
 (2) Assumes the U.S. Underwriters' over-allotment option to purchase 978,750
     shares of Common Stock is not exercised.
    
 
 (3) Represents 6,488,276 shares held of record by United HealthCare, 502,069
     shares held of record by United HealthCare Services, Inc., a subsidiary
     thereof, 509,595 shares held of record by HLM Partners VII, L.P., of which
     United HealthCare is a limited partner and 1,270,080 shares held of record
     by Validus, L.P., of which United HealthCare is the sole limited partner.
     United HealthCare disclaims beneficial ownership of shares held by both
     limited partnerships except for its proportionate interest therein. Dr.
     McGuire, a director of the Company, is the President, Chief Executive
     Officer and Chairman of United HealthCare. Dr. McGuire disclaims beneficial
     ownership of all shares held by United HealthCare. United HealthCare's
     address is 9900 Bren Road East, 300 Opus Center, Minnetonka, MN 55343.
 
                                       65
<PAGE>
   
 (4) Represents 4,000,000 shares held of record by Dr. Clark as trustee of the
     James H. Clark and Nancy Rutter Clark Revocable Trust, 1,017,229 shares
     held of record by Clark Ventures, 268,000 shares held of record by JHC
     Investments, LLC and 3,200,369 shares held of record by Monaco Partners,
     LP. As part of the Related Sale, Monaco Partners, LP has indicated an
     interest in purchasing 2,451,786 shares of the Company's Common Stock which
     shares are included in the percentage held by Dr. Clark, Clark Ventures and
     Monaco Partners, LP after the offering. Dr. Clark wholly controls Clark
     Ventures, JHC Investments, LLC and Monaco Partners, LP. Dr. Clark is a
     director of the Company. The address for Dr. Clark is c/o Healtheon
     Corporation, 4600 Patrick Henry Drive, Santa Clara, CA 95054. The address
     for Clark Ventures and Monaco Partners, LP is 777 East Williams Street,
     Suite 201, Carson City, NV 89701.
    
 
   
 (5) Represents 5,125,863 shares held of record directly by Kleiner Perkins
     Caufield & Byers VII L.P. ("KPCB VII"), 787,069 shares held of record by
     KPCB Java Fund, and 311,207 shares held of record by KPCB Life Sciences
     Zaibatsu Fund II. Also represents 976,423 shares subject to warrants held
     of record by KPCB VII, and 52,936 shares subject to warrants held of record
     by KPCB Life Sciences Zaibatsu Fund II L.P., all of which are exercisable
     within 60 days of August 31, 1998. KPCB Life Sciences Zaibatsu Fund II and
     KPCB VII are wholly controlled by KPCB VII Associates, L.P. KPCB Java Fund
     is controlled by KPCB VIII Associates. L. John Doerr, a general partner of
     KPCB VIII Associates and KPCB VII Associates, L.P., is a director of the
     Company. Mr. Doerr disclaims beneficial ownership of shares in such
     entities except to the extent of his pecuniary interest therein. Kleiner
     Perkins Caufield & Byers' address is 2750 Sand Hill Road, Menlo Park, CA
     94025.
    
 
 (6) Represents 2,975,140 shares held of record by P. E. Sadler and 2,026,853
     shares held of record by SFA Limited Partnership, of which P. E. Sadler is
     a general partner. Mr. Sadler is a director of the Company. Mr. Sadler's
     address is c/o Healtheon Corporation, 4600 Patrick Henry Drive, Santa
     Clara, CA 95054.
 
 (7) Dr. Yamada, a director of the Company, is President and Executive Director
     of SmithKline Beecham HealthCare Services and a director of SmithKline
     Beecham. SmithKline Labs' address is 1201 South Collegeville Road,
     Collegeville, PA 19426. Dr. Yamada disclaims beneficial ownership of all
     shares held by SmithKline Labs.
 
 (8) Represents 3,306,923 shares held of record directly by New Enterprise
     Associates VI, L.P. ("New Enterprise Associates VI"), 11,979 shares subject
     to warrants held of record by New Enterprise Associates VI exercisable
     within 60 days of August 31, 1998, and 20,000 shares held of record by NEA
     Ventures 1996, L.P., which is controlled by New Enterprise Associates VI.
     Mr. Kramlich is a partner of New Enterprise Associates VI. Mr. Kramlich
     disclaims beneficial ownership of shares held by such entities except for
     his proportional interest therein. New Enterprise Associates VI's address
     is 1119 St. Paul Street, Baltimore, MD 21202.
 
 (9) Includes 650,000 shares held of record by Mr. Long. Also includes 750,000
     shares subject to a warrant held of record by Mr. Long and 381,250 shares
     subject to options held of record by Mr. Long, in each case exercisable
     within 60 days of August 31, 1998. 315,000 shares underlying the warrant
     held by Mr. Long will remain subject to a right of repurchase by the
     Company 60 days after August 31, 1998. Mr. Long is the Chief Executive
     Officer and a director of the Company.
 
 (10) Represents 92,500 shares held of record directly by Mr. Hoover, 2,500
      shares held by Nicholas D. Hoover for which Mr. Hoover is custodian, and
      793,268 shares subject to options held of record by Mr. Hoover that are
      exercisable within 60 days of August 31, 1998. Mr. Hoover is the President
      and a director of the Company.
 
 (11) Includes 31,250 shares subject to options held of record by Mr. Nigam that
      are exercisable within 60 days of August 31, 1998. Also includes 187,500
      shares that will remain subject to a right of repurchase by the Company 60
      days after August 31, 1998. Mr. Nigam is the Vice President, Engineering
      of the Company.
 
 (12) Includes 2,292 shares subject to options held of record by Ms. Shea that
      are exercisable within 60 days of August 31, 1998. Also includes 57,291
      shares that will remain subject to a right of repurchase by the Company 60
      days after August 31, 1998.
 
 (13) Includes 833 shares subject to options held of record by Mr. Chan that are
      exercisable within 60 days of August 31, 1998. Also includes 16,750 shares
      held by Mr. Chan that will remain subject to a right of repurchase held by
      the Company 60 days after August 31, 1998. Mr. Chan is the Controller of
      the Company.
 
 (14) Includes all shares described in the above footnotes and includes an
      additional 2,363,180 shares held by other executive officers, of which
      2,038,428 shares were outstanding as of August 31, 1998 and 324,752 shares
      are subject to options or warrants that are exercisable within 60 days of
      August 31, 1998.
 
                                       66
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
    The following summary of certain provisions of the Company's capital stock
describes all material provisions of the Company's Certificate of Incorporation
and Bylaws. This summary, however, does not purport to be complete and is
subject to, and qualified in its entirety by, the Certificate of Incorporation
and Bylaws, copies of which have been filed as exhibits to the Registration
Statement of which this Prospectus is a part and by the provisions of applicable
law.
 
   
    As of August 31, 1998, there were 54,317,201 shares of Common Stock
outstanding, par value $0.0001 per share. In addition, approximately 15,000,000
shares of Common Stock issuable upon exercise of outstanding stock options or
have been reserved for future grants under the 1996 Stock Plan and the 1998
Purchase Plan. Upon consummation of the Underwritten Offering and the Related
Sale, 150,000,000 shares of Common Stock and 5,000,000 shares of Preferred Stock
will be authorized, and 64,056,487 shares of Common Stock and no shares of
Preferred Stock will be issued and outstanding.
    
 
COMMON STOCK
 
    The issued and outstanding shares of Common Stock are, and the shares of
Common Stock being offered by the Company will be upon payment therefor, validly
issued, fully paid and nonassessable. The holders of outstanding shares of
Common Stock are entitled to receive dividends out of assets legally available
therefor at such time and in such amounts as the Board may from time to time
determine. See "Dividend Policy." The shares of Common Stock are not convertible
and the holders thereof have no preemptive or subscription rights to purchase
any securities of the Company. Upon liquidation, dissolution or winding up of
the Company, the holders of Common Stock are entitled to receive pro rata the
assets of the Company that are legally available for distribution, after payment
of all debts and other liabilities. Each outstanding share of Common Stock is
entitled to one vote on all matters submitted to a vote of the stockholders,
including election of directors. There is no cumulative voting in the election
of directors.
 
PREFERRED STOCK
 
    The Company's Certificate of Incorporation provides that the Preferred Stock
may be issued by the Company in one or more series and that the Board has the
authority, without further action by the stockholders, to fix the rights,
preferences and privileges thereof, including dividend rights, conversion
rights, voting rights, rights and terms of redemption, liquidation preferences
and sinking fund terms, any or all of which may be greater than the rights of
the Common Stock. The issuance of Preferred Stock could adversely affect the
voting power of holders of Common Stock and the likelihood that such holders
would receive dividend payments and payments upon liquidation. Such issuance
could have the effect of decreasing the market price of the Common Stock. The
issuance of Preferred Stock may also have the effect of delaying, deterring or
preventing a change in control of the Company. The Company has no present plans
to issue any shares of Preferred Stock.
 
WARRANTS
 
    The Company has outstanding warrants for the purchase of 2,077,240 shares of
Common Stock. Of these, warrants to purchase 1,794,718 shares of Common Stock
have an exercise price of $2.00 and warrants to purchase 282,522 shares of
Common Stock have an exercise price of $7.97. These warrants expire either three
years or five years after the date of issuance. In addition, as part of a
service agreement with a customer, the Company will issue to the customer a
warrant to purchase 500,000 shares of Common Stock with an exercise price of
$10.40 per share.
 
REGISTRATION RIGHTS
 
   
    The holders of approximately 43,218,397 shares of Common Stock (representing
shares held by the purchasers of Common Stock at the founding of the Company in
December 1995, the purchasers of
    
 
                                       67
<PAGE>
Preferred Stock of the Company prior to its conversion in connection with the
acquisition of ActaMed, and shares held by certain former shareholders of
ActaMed who received shares of the Company's Common Stock pursuant to the
Company's acquisition of ActaMed and who had registration rights with respect to
their shares of ActaMed capital stock) or their permitted transferees are
entitled to certain rights with respect to registration of such shares (the
"Registrable Securities") under the Securities Act pursuant to an Amended and
Restated Investors' Rights Agreement. At any time after 12 months following the
effective date of this offering, the holders of at least 40% of the Registrable
Securities then outstanding may require the Company to file a registration
statement covering Registrable Securities with an aggregate gross offering price
of at least $10.0 million. In addition, two years after this offering, holders
of registrable securities may require, on up to four separate occasions, that
the Company register their shares for public resale on Form S-3 or any successor
form, provided the Company is eligible to use Form S-3 or any such successor
form and provided further that the value of the securities to be registered is
at least $1.0 million. Furthermore, in the event the Company elects to register
any of its shares of Common Stock or other securities for purposes of effecting
any public offering, the holders of registrable securities are entitled to
include their Registrable Securities in the registration, subject however to the
right of the Company to reduce the number of shares proposed to be registered in
view of market conditions. All expenses in connection with any registration
(other than underwriting discounts and commissions) will be borne by the
Company. Registration rights, other than the right to require the Company to
register shares on Form S-3 or any successor form, will terminate at such time
as the Company's shares are publicly traded and the holder is entitled to sell
all of its shares in any three-month period under Rule 144 of the Securities
Act. If such holders, by exercising their registration rights, cause a large
number of securities to be registered and sold in the public market, such sales
could have an adverse effect on the market price for the Company's Common Stock.
If the Company were to initiate a registration and include Registrable
Securities pursuant to the exercise of registration rights, the sale of such
Registrable Securities could have an adverse effect on the Company's ability to
raise capital.
 
CERTAIN ANTI-TAKEOVER EFFECTS OF PROVISIONS OF THE COMPANY'S CERTIFICATE OF
  INCORPORATION AND BYLAWS AND OF DELAWARE LAW
 
    GENERAL.  Certain provisions of the DGCL and the Company's Certificate of
Incorporation and Bylaws could have the effect of making it more difficult for a
third party to acquire, or of discouraging a third party from acquiring, control
of the Company. Such provisions could limit the price that certain investors
might be willing to pay in the future for shares of the Company's Common Stock.
These provisions of Delaware law and the Certificate of Incorporation and Bylaws
may also have the effect of discouraging or preventing certain types of
transactions involving an actual or threatened change of control of the Company
(including unsolicited takeover attempts), even though such a transaction may
offer the Company's stockholders the opportunity to sell their stock at a price
above the prevailing market price.
 
    DELAWARE TAKEOVER STATUTE.  Following consummation of this offering, the
Company will be subject to the "business combination" provisions of Section 203
of the DGCL. In general, such provisions prohibit a publicly held Delaware
corporation from engaging in various "business combination" transactions with
any interested stockholder for a period of three years after the date of the
transaction in which the person became an interested stockholder, unless (i) the
transaction is approved by the board of directors prior to the date the
interested stockholder obtained such status; (ii) upon consummation of the
transaction that resulted in the stockholder's becoming an interested
stockholder, the stockholder owned at least 85% of the voting stock of the
corporation outstanding at the time the transaction commenced, excluding for
purposes of determining the number of shares outstanding those shares owned by
(a) persons who are directors and also officers and (b) employee stock plans in
which employee participants do not have the right to determine confidentially
whether shares held subject to the plan will be tendered in a tender or exchange
offer; or (iii) on or subsequent to such date the business combination is
approved by the board of directors and authorized at an annual or special
meeting of stockholders by the affirmative vote of at least 66 2/3% of the
outstanding voting stock that is not owned by the interested stockholder. A
"business
 
                                       68
<PAGE>
combination" is defined to include mergers, asset sales and other transactions
resulting in financial benefit to a stockholder. In general, an "interested
stockholder" is a person who, together with affiliates and associates, owns (or
within three years, did own) 15% or more of a corporation's voting stock. The
statute could prohibit or delay mergers or other takeover or change in control
attempts with respect to the Company and, accordingly, may discourage attempts
to acquire the Company.
 
    CERTIFICATE OF INCORPORATION AND BYLAWS.  The Company's Certificate of
Incorporation provides that any action required or permitted to be taken by the
stockholders of the Company must be effected at a duly called annual or special
meeting of the stockholders and may not be taken by a consent in writing by
stockholders. The Company's Bylaws provide that special meetings of the
stockholders of the Company may be called by the Board or by the President of
the Company, or by one or more stockholders holding at least 10% of the voting
power of the Company's outstanding capital stock, or any such person or persons
as may be authorized by the Certificate of Incorporation or the Bylaws (which
currently only give this authority to the Board). The Company's Bylaws also
require advance written notice by a stockholder of a proposal or director
nomination that such stockholder desires to present at an annual or special
meeting of stockholders. No business other than that stated in the notice may be
transacted at any special meeting. These provisions will have the effect of
delaying consideration of a stockholder proposal until the next annual meeting
unless a special meeting is called by the Board.
 
    The Company's Bylaws provide that the authorized number of directors may be
changed by an amendment to the Bylaws adopted by the Board or by the
stockholders. Vacancies on the Board may be filled either by holders of a
majority of the Company's voting stock or a majority of directors in office,
although less than a quorum. The Certificate of Incorporation and the Bylaws of
the Company also provide for a classified Board. Under this provision, the Board
designates each director position as one of three categories. Each year the
directors' positions in one of the categories are subject to election so that it
would take three years to replace the entire board (absent resignation or
premature expiration of a director's term), which may have the effect of
deterring a hostile takeover or delaying or preventing changes in control or
management of the Company.
 
LIMITATIONS ON LIABILITY AND INDEMNIFICATION OF OFFICERS AND DIRECTORS
 
    The Company's Certificate of Incorporation limits the liability of directors
to the fullest extent permitted by the DGCL. In addition, the Certificate of
Incorporation and Bylaws provide that the Company will indemnify directors and
officers of the Company to the fullest extent permitted by Delaware law. The
Company intends to enter into separate indemnification agreements with its
directors and executive officers that provide such persons indemnification
protection in the event the Certificate of Incorporation is subsequently
amended. See "Risk Factors -- Certain Anti-Takeover Provisions."
 
TRANSFER AGENT AND REGISTRAR
 
    American Stock Transfer Trust Company has been appointed as transfer agent
and registrar for the Company's Common Stock.
 
LISTING
 
    The shares of Common Stock have been approved for quotation on the Nasdaq
National Market under the symbol "HLTH" subject to official notice of issuance.
 
                                       69
<PAGE>
                        SHARES ELIGIBLE FOR FUTURE SALE
 
    Prior to the Underwritten Offering, there has been no public market for the
Common Stock of the Company. The Company cannot predict the effect, if any, that
sales of shares of Common Stock or the availability of shares for sale will have
on the market price of the Common Stock prevailing from time to time.
Nevertheless, sales of a significant number of shares of Common Stock in the
public market, or the perception that such sales may occur, could adversely
affect the prevailing market price of the Common Stock.
 
   
    Upon consummation of the Underwritten Offering and the Related Sale, the
Company will have 64,056,487 shares of Common Stock outstanding, based on the
number of shares of Common Stock outstanding as of August 31, 1998, assuming (i)
the issuance by the Company of shares of Common Stock offered in the
Underwritten Offering, (ii) no exercise of options or warrants after August 31,
1998 and (iii) no exercise of the U.S. Underwriters' over-allotment option. Of
the shares outstanding after the offerings, 6,199,000 of the shares of Common
Stock sold in the Underwritten Offering will be freely tradeable without
restriction under the Securities Act, except for any such shares that may be
acquired by an "affiliate" of the Company (an "affiliate"), which shares will be
subject to the volume and other limitations of Rule 144 promulgated under the
Securities Act ("Rule 144"). As defined in Rule 144, an "affiliate" of an issuer
is a person who, directly or indirectly, through one or more intermediaries,
controls or is controlled by, or is under common control with, such issuer. Upon
expiration of the lock-up agreements described below, (A) 1,088,500 of the
shares sold in the Underwritten Offering will be freely tradeable and (B) the
2,451,786 shares to be sold in the Related Sale will be freely tradeable subject
to the volume and other limitations of Rule 144. Of the remaining 54,317,201
shares of Common Stock, (i) 47,534,750 shares will be restricted securities (as
that phrase is defined in Rule 144) (the "Restricted Shares") and may not be
resold in the absence of registration under the Securities Act or pursuant to an
exemption from such registration, including the exemption provided by Rule 144
under the Securities Act and (ii) 6,782,451 shares may be resold pursuant to an
exemption from registration under Section 3(a)(10) of the Securities Act (the
"3(a)(10) Shares"), subject to the lock-up agreements discussed below. Each of
the Company's directors and officers and certain other stockholders of the
Company has agreed that, subject to certain exceptions, without the prior
written consent of Morgan Stanley & Co. Incorporated on behalf of the
Underwriters, during the period ending 180 days after the date of this
Prospectus, he will not (i) offer, pledge, sell, contract to sell, sell any
option or contract to purchase, purchase any option or contract to sell, grant
any option, right or warrant to purchase, lend, or otherwise transfer or dispose
of, directly or indirectly, any shares of Common Stock or any securities
convertible into or exercisable or exchangeable for Common Stock or (ii) enter
into any swap or other arrangement that transfers to another, in whole or in
part, any of the economic consequences of ownership of the Common Stock, whether
any such transaction described in clause (i) or (ii) above is to be settled by
delivery of Common Stock or such other securities, in cash or otherwise.
    
 
   
    On the date of this Prospectus, 689,609 of the 3(a)(10) Shares (in addition
to 6,199,000 of the shares offered in the Underwritten Offering) will be
eligible for immediate sale. Upon the expiration of lock-up agreements 180 days
after the date of the Prospectus, an additional 6,092,842 of the 3(a)(10) Shares
and 43,581,312 of the Restricted Shares (in addition to 1,088,500 of the shares
to be sold in the Underwritten Offering and the 2,451,786 shares to be sold in
the Related Sale) will become eligible for sale in the public market. Of these
shares eligible for sale in the public market upon expiration of the lock-up
agreements, all but 9,748,940 shares will be subject to the volume limitations
and other conditions of Rule 144. The holders of approximately 43,218,397 shares
of Common Stock are also entitled to certain rights with respect to registration
of such shares of Common Stock for offer or sale to the public. If such holders,
by exercising their registration rights, cause a large number of shares to be
registered and sold in the public market, such sales could have a material
adverse effect on the market price for the Company's Common Stock.
    
 
                                       70
<PAGE>
   
    Under Rule 144 as currently in effect, beginning 90 days after the date of
this Prospectus, a person (or persons whose shares are aggregated) who has
beneficially owned restricted securities for at least one year would be entitled
to sell a number of shares of Common Stock within any three-month period equal
to the greater of 1% of the then outstanding shares of the Common Stock
(approximately 640,565 shares immediately after the offering) or the average
weekly reported volume of trading of the Common Stock on the Nasdaq National
Market during the four calendar weeks preceding such sale, provided that certain
manner of sale and notice requirements and requirements as to the availability
of current public information concerning the Company are satisfied. Under Rule
144(k), a person who is not deemed to have been an affiliate of the Company at
any time during the 90 days preceding a sale, and who has beneficially owned the
shares proposed to be sold for at least two years (including the holding period
of any prior owner except an affiliate), is entitled to sell such shares without
complying with the manner of sale, public information, volume limitation or
notice provisions of Rule 144; therefore, unless otherwise restricted, "144(k)
shares" may be sold immediately upon the completion of this offering.
    
 
    Immediately after this offering, there will be options to purchase
approximately 10,670,074 shares of Common Stock outstanding. Subject to the
provisions of the lock-up agreements described above, holders of these options
may rely on the resale provisions of Rule 701 under the Securities Act, which
permits nonaffiliates to sell their shares without having to comply with the
current public information, holding period, volume limitation or notice
provisions of Rule 144 and permits affiliates to sell their shares without
having to comply with the holding period provision of Rule 144, in each case
beginning 90 days after the consummation of this offering. In addition, shortly
after this offering, the Company intends to file a registration statement on
Form S-8 covering the 13,994,510 shares of Common Stock reserved for issuance
under the 1996 Plan and the 1998 Purchase Plan. Shares of Common Stock
registered under such registration statement will, subject to Rule 144 volume
limitations applicable to affiliates, be available for sale in the open market,
unless such shares are subject to vesting restriction with the Company or the
lock-up agreements described below. See "Management -- Employee Benefit Plans."
 
                                       71
<PAGE>
                     CERTAIN UNITED STATES TAX CONSEQUENCES
                      TO NON-U.S. HOLDERS OF COMMON STOCK
 
    The following is a general discussion of certain United States federal
income and estate tax consequences relevant to holders of Common Stock that are
non-U.S. Holders. A non-U.S. Holder is a holder of Common Stock that is not, for
United States federal income tax purposes, any of the following: (i) a citizen
or resident of the United States, (ii) a corporation, partnership or other
entity created or organized in or under the laws of the United States or any
state thereof, (iii) an estate, the income of which is subject to U.S. federal
income taxation regardless of its source, or (iv) a trust that meets the
following two tests: (A) a U.S. court is able to exercise primary supervision
over the administration of the trust, and (B) one or more U.S. persons have the
authority to control all substantial decisions of the trust. This discussion
does not consider the specific facts and circumstances that may be relevant to
particular non-U.S. Holders in light of their personal circumstances and does
not address the treatment of such holders under the laws of any state, local or
foreign taxing jurisdiction. Further, the discussion is based on provisions of
the United States Internal Revenue Code of 1986, as amended (the "Code"),
Treasury regulations thereunder, and administrative and judicial interpretations
thereof, all as in effect on the date hereof and all of which are subject to
change or different interpretation on a possibly retroactive basis. THIS
DISCUSSION IS LIMITED TO NON-U.S. HOLDERS WHO HOLD THE COMMON STOCK AS A CAPITAL
ASSET. EACH PROSPECTIVE HOLDER IS URGED TO CONSULT ITS TAX ADVISOR WITH RESPECT
TO THE UNITED STATES FEDERAL TAX CONSEQUENCES OF ACQUIRING, HOLDING AND
DISPOSING OF COMMON STOCK, AS WELL AS ANY TAX CONSEQUENCES THAT MAY ARISE UNDER
THE LAWS OF ANY STATE, LOCAL OR FOREIGN TAXING JURISDICTION.
 
DIVIDENDS
 
    Dividends paid to a non-U.S. Holder of Common Stock will be subject to
United States federal withholding tax at a 30% rate or such lower rate as may be
specified by an applicable income tax treaty, unless the dividends are
effectively connected with the conduct of a trade or business within the United
States (and are attributable to a United States permanent establishment of such
holder, if an applicable income tax treaty so requires as a condition for the
non-U.S. holder to be subject to United States income tax on a net income basis
in respect of such dividends). Such "effectively connected" dividends are
subject to tax at rates applicable to United States citizens, resident aliens
and domestic United States corporations, and are not generally subject to
withholding. Any such effectively connected dividends received by a corporate
non-U.S. Holder may also, under certain circumstances, be subject to an
additional "branch profits tax" at a 30% rate or such lower rate as may be
specified by an applicable income tax treaty.
 
    Under currently effective United States Treasury regulations, dividends paid
prior to January 1, 2000 to an address in a foreign country are presumed to be
paid to a resident of that country (unless the payor has knowledge to the
contrary) for purposes of the withholding discussed above and, under the current
interpretation of United States Treasury regulations, for purposes of
determining the applicability of a tax treaty rate. Under recently finalized
United States Treasury regulations that will generally be effective for
distributions after December 31, 1999 (the "Final Withholding Regulations"),
however, a non-U.S. Holder of Common Stock who wishes to claim the benefit of an
applicable treaty rate would be required to satisfy applicable certification
requirements. In addition, under the Final Withholding Regulations, in the case
of Common Stock held by a foreign partnership, (i) the certification requirement
would generally be applied to the partners of the partnership and (ii) the
partnership would be required to provide certain information, including a United
States taxpayer identification number. The Final Withholding Regulations provide
look-through rules for tiered partnerships.
 
    A non-U.S. Holder of Common Stock that is eligible for a reduced rate of
United States withholding tax pursuant to a tax treaty may obtain a refund of
any excess amounts currently withheld by filing an appropriate claim for refund
with the United States Internal Revenue Service.
 
                                       72
<PAGE>
GAIN ON DISPOSITION OF COMMON STOCK
 
    A non-U.S. holder generally will not be subject to United States federal
income tax in respect of gain recognized on a disposition of Common Stock
unless: (i) the gain is effectively connected with a trade or business conducted
by the non-U.S. Holder in the United States (and is attributable to a permanent
establishment maintained in the United States by such non-U.S. Holder if an
applicable income tax treaty so requires as a condition for such non-U.S. Holder
to be subject to United States taxation on a net income basis in respect of gain
from the sale or other disposition of the Common Stock); (ii) in the case of a
non-U.S. Holder who is an individual and holds the Common Stock as a capital
asset, such holder is present in the United States for 183 or more days in the
taxable year of the sale and certain other conditions exist; (iii) the Company
is or has been a "United States real property holding corporation" for federal
income tax purposes and, in the event that the Common Stock is considered
"regularly traded on an established securities market," the non-U.S. Holder
held, directly or indirectly at any time during the five-year period ending on
the date of disposition, more than 5% of the Common Stock (and is not eligible
for any treaty exemption); or (iv) the non-U.S. Holder is subject to tax
pursuant to certain provisions of the Code applicable to U.S. expatriates.
Effectively connected gains realized by a corporate non-U.S. Holder may also,
under certain circumstances, be subject to an additional "branch profits tax" at
a 30% rate or such lower rate as may be specified by an applicable income tax
treaty.
 
    The Company believes it is not currently, and does not anticipate becoming,
a "United States real property holding corporation" for federal income tax
purposes.
 
FEDERAL ESTATE TAXES
 
    Common Stock held by a non-U.S. Holder at the time of death will be included
in such holder's gross estate for United States federal estate tax purposes,
unless an applicable estate tax treaty provides otherwise.
 
INFORMATION REPORTING AND BACKUP WITHHOLDING
 
    Under current law, United States information reporting requirements (other
than reporting of dividend payments for purposes of the withholding tax noted
above) and backup withholding tax generally will not apply to dividends paid to
non-U.S. Holders that are either subject to the 30% withholding discussed above
or that are not so subject because an applicable tax treaty reduces such
withholding. Otherwise, backup withholding of United States federal income tax
at a rate of 31% may apply to dividends paid with respect to Common Stock to
holders that are not "exempt recipients" and that fail to provide certain
information (including the holder's United States taxpayer identification
number). Generally, unless the payor of dividends has actual knowledge that the
payee is a United States person, the payor may treat dividend payments to a
payee with a foreign address as exempt from information reporting and backup
withholding. However, under the Final Withholding Regulations, dividend payments
generally will be subject to information reporting and backup withholding unless
applicable certification requirements are satisfied. See the discussion above
with respect to the rules applicable to foreign partnerships under the Final
Withholding Regulations.
 
    In general, United States information reporting and backup withholding
requirements also will not apply to a payment made outside the United States of
the proceeds of a sale of Common Stock through an office outside the United
States of a non-United States broker. However, United States information
reporting (but not backup withholding) requirements will apply to a payment made
outside the United States of the proceeds of a sale of Common Stock through an
office outside the United States of a broker that is a United States person,
that derives 50% or more of its gross income for certain periods from the
conduct of a trade or business in the United States, that is a "controlled
foreign corporation" as to the United States, or, in the case of payments made
after December 31, 1999, a foreign partnership with certain connections to the
United States, unless the broker has documentary evidence in its records that
 
                                       73
<PAGE>
the holder or beneficial owner is a non-United States person or the holder or
beneficial owner otherwise establishes an exemption. Payment of the proceeds of
the sale of Common Stock to or through a United States office of a broker is
currently subject to both United States backup withholding and information
reporting unless the holder certifies its non-United States status under
penalties of perjury or otherwise establishes an exemption.
 
    A non-U.S. Holder generally may obtain a refund of any excess amounts
withheld under the backup withholding rules by filing the appropriate claim for
refund with the United States Internal Revenue Service.
 
                                       74
<PAGE>
                                  UNDERWRITERS
 
    Under the terms and subject to the conditions contained in an Underwriting
Agreement dated the date hereof (the "Underwriting Agreement"), the U.S.
Underwriters named below, for whom Morgan Stanley & Co. Incorporated, Goldman,
Sachs & Co., Hambrecht & Quist LLC and Volpe Brown Whelan & Company, LLC are
acting as U.S. Representatives, and the International Underwriters named below
for whom Morgan Stanley & Co. International Limited, Goldman Sachs
International, Hambrecht & Quist LLC & Volpe Brown Whelan & Company, LLC are
acting as International Representatives, have severally agreed to purchase, and
the Company has agreed to sell to them, severally, the respective number of
shares of Common Stock set forth opposite the names of such Underwriters below:
 
   
<TABLE>
<CAPTION>
                                                                                   NUMBER OF
                                      NAME                                           SHARES
- ---------------------------------------------------------------------------------  ----------
<S>                                                                                <C>
U.S. Underwriters:
  Morgan Stanley & Co. Incorporated..............................................
  Goldman, Sachs & Co............................................................
  Hambrecht & Quist LLC..........................................................
  Volpe Brown Whelan & Company, LLC..............................................
                                                                                   ----------
    Subtotal.....................................................................   5,830,000
                                                                                   ----------
International Underwriters:
  Morgan Stanley & Co. International Limited.....................................
  Goldman Sachs International....................................................
  Hambrecht & Quist LLC..........................................................
  Volpe Brown Whelan & Company, LLC..............................................
                                                                                   ----------
    Subtotal.....................................................................   1,457,500
                                                                                   ----------
        Total....................................................................   7,287,500
                                                                                   ----------
                                                                                   ----------
</TABLE>
    
 
    The U.S. Underwriters and the International Underwriters, and the U.S.
Representatives and the International Representatives, are collectively referred
to as the "Underwriters" and the "Representatives," respectively. The
Underwriting Agreement provides that the obligations of the several Underwriters
to pay for and accept delivery of the shares of Common Stock offered hereby are
subject to the approval of certain legal matters by their counsel and to certain
other conditions. The Underwriters are obligated to take and pay for all of the
shares of Common Stock offered hereby (other than those covered by the U.S.
Underwriters' over-allotment option described below) if any such shares are
taken.
 
    Pursuant to the Agreement between U.S. and International Underwriters, each
U.S. Underwriter has represented and agreed that, with certain exceptions: (i)
it is not purchasing any Shares (as defined herein) for the account of anyone
other than a United States or Canadian Person (as defined herein) and (ii) it
has not offered or sold, and will not offer or sell, directly or indirectly, any
Shares or distribute any prospectus relating to the Shares outside the United
States or Canada or to anyone other than a United States or Canadian Person.
Pursuant to the Agreement between U.S. and International Underwriters, each
International Underwriter has represented and agreed that, with certain
exceptions: (i) it is not purchasing any Shares for the account of any United
States or Canadian Person and (ii) it has not offered or sold, and
 
                                       75
<PAGE>
will not offer or sell, directly or indirectly, any Shares or distribute any
prospectus relating to the Shares in the United States or Canada or to any
United States or Canadian Person. With respect to any Underwriter that is a U.S.
Underwriter and an International Underwriter, the foregoing representations and
agreements (i) made by it in its capacity as a U.S. Underwriter apply only to it
in its capacity as a U.S. Underwriter and (ii) made by it in its capacity as an
International Underwriter apply only to it in its capacity as an International
Underwriter. The foregoing limitations do not apply to stabilization
transactions or to certain other transactions specified in the Agreement between
U.S. and International Underwriters. As used herein, "United States or Canadian
Person" means any national or resident of the United States or Canada, or any
corporation, pension, profit-sharing or other trust or other entity organized
under the laws of the United States or Canada or of any political subdivision
thereof (other than a branch located outside the United States and Canada of any
United States or Canadian Person), and includes any United States or Canadian
branch of a person who is otherwise not a United States or Canadian Person. All
shares of Common Stock to be purchased by the Underwriters under the
Underwriting Agreement are referred to herein as the "Shares."
 
    Pursuant to the Agreement between U.S. and International Underwriters, sales
may be made between the U.S. Underwriters and International Underwriters of any
number of Shares as may be mutually agreed. The per share price of any Shares
sold shall be the public offering price set forth on the cover page hereof, in
United States dollars, less an amount not greater than the per share amount of
the concession to dealers set forth below.
 
    Pursuant to the Agreement between U.S. and International Underwriters, each
U.S. Underwriter has represented that it has not offered or sold, and has agreed
not to offer or sell, any Shares, directly or indirectly, in any province or
territory of Canada or to, or for the benefit of, any resident of any province
or territory of Canada in contravention of the securities laws thereof and has
represented that any offer or sale of Shares in Canada will be made only
pursuant to an exemption from the requirement to file a prospectus in the
province or territory of Canada in which such offer or sale is made. Each U.S.
Underwriter has further agreed to send to any dealer who purchases from it any
of the Shares a notice stating in substance that, by purchasing such Shares,
such dealer represents and agrees that it has not offered or sold, and will not
offer or sell, directly or indirectly, any of such Shares in any province or
territory of Canada or to, or for the benefit of, any resident of any province
or territory of Canada in contravention of the securities laws thereof and that
any offer or sale of Shares in Canada will be made only pursuant to an exemption
from the requirement to file a prospectus in the province or territory of Canada
in which such offer or sale is made, and that such dealer will deliver to any
other dealer to whom it sells any of such Shares a notice containing
substantially the same statement as is contained in this sentence.
 
    Pursuant to the Agreement between U.S. and International Underwriters, each
International Underwriter has represented and agreed that (i) it has not offered
or sold and, prior to the date six months after the closing date for the sale of
the Shares to the International Underwriters, will not offer or sell any Shares
to persons in the United Kingdom except to persons whose ordinary activities
involve them in acquiring, holding, managing or disposing of investments (as
principal or agent) for the purposes of their businesses or otherwise in
circumstances which have not resulted and will not result in an offer to the
public in the United Kingdom within the meaning of the Public Offers of
Securities Regulations 1995; (ii) it has complied and will comply with all
applicable provisions of the Financial Services Act 1986 with respect to
anything done by it in relation to the Shares in, from or otherwise involving
the United Kingdom; and (iii) it has only issued or passed on and will only
issue or pass on in the United Kingdom any document received by it in connection
with the offering of the Shares to a person who is of a kind described in
Article 11(3) of the Financial Services Act 1986 (Investment Advertisements)
(Exemptions) Order 1996 or is a person to whom such document may otherwise
lawfully be issued or passed on.
 
    Pursuant to the Agreement between U.S. and International Underwriters, each
International Underwriter has further represented that it has not offered or
sold, and has agreed not to offer or sell, directly or indirectly, in Japan or
to or for the account of any resident thereof, any of the Shares acquired
 
                                       76
<PAGE>
in connection with the distribution contemplated hereby, except for offers or
sales to Japanese International Underwriters or dealers and except pursuant to
any exemption from the registration requirements of the Securities and Exchange
Law and otherwise in compliance with applicable provisions of Japanese law. Each
International Underwriter has further agreed to send to any dealer who purchases
from it any of the Shares a notice stating in substance that, by purchasing such
Shares, such dealer represents and agrees that it has not offered or sold, and
will not offer or sell, any of such Shares, directly or indirectly, in Japan or
to or for the account of any resident thereof except for offers or sales to
Japanese International Underwriters or dealers and except pursuant to an
exemption from the registration requirements of the Securities and Exchange Law
and otherwise in compliance with applicable provisions of Japanese law, and that
such dealer will send to any other dealer to whom it sells any of such Shares a
notice containing substantially the same statement as is contained in this
sentence.
 
    The Underwriters initially propose to offer part of the shares of Common
Stock directly to the public at the public offering price set forth on the cover
page hereof and part to certain dealers at a price that represents a concession
not in excess of $   a share under the public offering price. Any Underwriter
may allow, and such dealers may reallow, a concession not in excess of $   a
share to other Underwriters or to certain other dealers. After the initial
offering of the shares of Common Stock, the offering price and other selling
terms may from time to time be varied by the Representatives.
 
    The Company has granted to the U.S. Underwriters an option, exercisable for
30 days from the date of this Prospectus, to purchase up to an aggregate of
978,750 additional shares of Common Stock at the public offering price set forth
on the cover page hereof, less underwriting discounts and commissions. The U.S.
Underwriters may exercise such option solely for the purpose of covering
over-allotments, if any, made in connection with the offering of the shares of
Common Stock offered hereby. To the extent such option is exercised, each U.S.
Underwriter will become obligated, subject to certain conditions, to purchase
approximately the same percentage of such additional shares of Common Stock as
the number set forth next to such U.S. Underwriter's name in the preceding table
bears to the total number of shares of Common Stock set forth next to the names
of all U.S. Underwriters in the preceding table.
 
    The Underwriters have informed the Company that they do not intend sales to
discretionary accounts to exceed five percent of the total number of shares of
Common Stock offered by them.
 
   
    At the request of the Company, the U.S. Underwriters have reserved up to
1,088,500 shares of Common Stock (the "Reserved Shares") from the Underwritten
Offering to be offered at the public offering price to certain persons
designated by the Company. The Reserved Shares include certain shares that the
Company had designated to be offered to an entity controlled by James H. Clark
and to certain other investors as part of the non-underwritten public offering
described below under "Related Sale" but were transferred into the Reserved
Shares portion of the Underwritten Offering at the request of the Company. Any
Reserved Shares not purchased by the persons designated by the Company will be
offered by the U.S. Underwriters to the general public.
    
 
   
    Each of the Company and the directors, officers and certain other
stockholders of the Company, including stockholders purchasing the Reserved
Shares has agreed that, without the prior written consent of Morgan Stanley &
Co. Incorporated on behalf of the Underwriters, it will not, during the period
ending 180 days after the date of this Prospectus, (i) offer, pledge, sell,
contract to sell, sell any option or contract to purchase, purchase any option
or contract to sell, grant any option, right or warrant to purchase, lend or
otherwise transfer or dispose of, directly or indirectly, any shares of Common
Stock or any securities convertible into or exercisable or exchangeable for
Common Stock or (ii) enter into any swap or other arrangement that transfers to
another, in whole or in part, any of the economic consequences of ownership of
the Common Stock, whether any such transaction described in clause (i) or (ii)
above is to be settled by delivery of Common Stock or such other securities, in
cash or otherwise. The restrictions described in this paragraph do not apply to
(x) the sale of Shares to the Underwriters, (y) the issuance by the Company of
shares of Common Stock upon the exercise of an option or a warrant or the
conversion of a security outstanding on the date of this Prospectus of which the
Underwriters have been advised in writing, or
    
 
                                       77
<PAGE>
   
(z) transactions by any person other than the Company relating to shares of
Common Stock or other securities acquired in open market transactions after the
completion of the offering of the Shares, provided that purchasers in
transactions described in clause (y) enter into similar "lock-up" agreements.
    
 
    In order to facilitate the offering of the Common Stock, the Underwriters
may engage in transactions that stabilize, maintain or otherwise affect the
price of the Common Stock. Specifically, the Underwriters may over-allot in
connection with the offering, creating a short position in the Common Stock for
their own account. In addition, to cover over-allotments or to stabilize the
price of the Common Stock, the Underwriters may bid for, and purchase, shares of
Common Stock in the open market. Finally, the underwriting syndicate may reclaim
selling concessions allowed to an Underwriter or a dealer for distributing the
Common Stock in the offering, if the syndicate repurchases previously
distributed Common Stock in transactions to cover syndicate short positions, in
stabilization transactions or otherwise. Any of these activities may stabilize
or maintain the market price of the Common Stock above independent market
levels. The Underwriters are not required to engage in these activities, and may
end any of these activities at any time.
 
    The Company and the Underwriters have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act.
 
    Certain of the Underwriters from time to time perform various investment
banking services for the Company, for which such Underwriters receive
compensation.
 
PRICING OF THE OFFERING
 
    Prior to this offering, there has been no public market for the Common
Stock. The initial public offering price will be determined by negotiations
between the Company and the U.S. Representatives. Among the factors to be
considered in determining the initial public offering price will be the future
prospects of the Company and its industry in general, sales, earnings and
certain other financial and operating information of the Company in recent
periods, and the price-earnings ratios, price-sales ratios, market prices of
securities and certain financial and operating information of companies engaged
in activities similar to those of the Company. The estimated initial public
offering price range set forth on the cover page of this Preliminary Prospectus
is subject to change as a result of market conditions and other factors.
 
   
RELATED SALE
    
 
   
    Concurrently with the Underwritten Offering, the Company expects that it
will sell 2,451,786 shares of Common Stock directly to an entity controlled by
James H. Clark, the Company's Chairman of the Board of Directors, which has
indicated an interest in purchasing shares of Common Stock, in a
non-underwritten public offering and at a purchase price equal to the price per
share of the shares offered to the public in the Underwritten Offering.
    
 
                                 LEGAL MATTERS
 
    The validity of the issuance of the shares of Common Stock offered hereby
will be passed upon for the Company by Wilson Sonsini Goodrich & Rosati,
Professional Corporation, Palo Alto, California. Certain legal matters in
connection with this offering will be passed upon for the Underwriters by
Fenwick & West LLP, Palo Alto, California.
 
                                    EXPERTS
 
    Healtheon was incorporated in December 1995 and did not commence operations
until January 1996. Thus, the financial statements of ActaMed for the year ended
December 31, 1995 also represent the financial statements of Healtheon on a
pooled basis for that period.
 
    The consolidated financial statements of Healtheon Corporation at December
31, 1996 and 1997 and June 30, 1998, and for the two years in the period ended
December 31, 1997 and for the six month period ended June 30, 1998, appearing in
this Prospectus and Registration Statement have been audited by
 
                                       78
<PAGE>
Ernst & Young LLP, independent auditors, as set forth in their report thereon
appearing elsewhere herein which, as to the year ended December 31, 1996, is
based in part on the report of Deloitte & Touche LLP, independent auditors. The
consolidated financial statements referred to above are included in reliance
upon such report given upon the authority of such firm as experts in accounting
and auditing.
 
    The consolidated financial statements of ActaMed Corporation for the year
ended December 31, 1995, included in this Prospectus and Registration Statement
have been audited by Deloitte & Touche LLP, independent auditors, as stated in
their report appearing herein. The consolidated financial statements of ActaMed
Corporation as of December 31, 1996 and for the year then ended, (not separately
presented in this Prospectus and Registration Statement) have been audited by
Deloitte & Touche LLP, independent auditors, as stated in their report appearing
herein, (which expresses an unqualified opinion and includes an explanatory
paragraph relating to the restatement of ActaMed Corporation 1996 financial
statements as described in Note 14). Such financial statements are included in
reliance upon the report of such firm given upon their authority as experts in
accounting and auditing.
 
    The statements of divisional net loss and United HealthCare Corporation's
net investment and of divisional cash flows of EDI Services Group (a division of
United HealthCare Corporation) included in this Prospectus and Registration
Statement have been audited by Deloitte and Touche LLP, independent auditors, as
stated in their report appearing herein, and are included in reliance upon the
report of such firm given upon their authority as experts in accounting and
auditing.
 
                             ADDITIONAL INFORMATION
 
    The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-1 under the Securities Act, and
the rules and regulations promulgated thereunder, with respect to the Common
Stock offered hereby. This Prospectus, which constitutes a part of the
Registration Statement, does not contain all of the information set forth in the
Registration Statement and the exhibits thereto. Statements contained in this
Prospectus as to the contents of any contract or other document that is filed as
an exhibit to the Registration Statement are not necessarily complete and each
such statement is qualified in all respects by reference to the full text of
such contract or document. For further information with respect to the Company
and the Common Stock, reference is hereby made to the Registration Statement and
the exhibits thereto, which may be inspected and copied at the principal office
of the Commission, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the
regional offices of the Commission located at Seven World Trade Center, Suite
1300, New York, New York 10048 and Citicorp Center, 500 West Madison Street,
Suite 1400, Chicago, Illinois 60661, and copies of all or any part thereof may
be obtained at prescribed rates from the Commission's Public Reference Section
at such addresses. Also, the Commission maintains a World Wide Web site on the
Internet at http://www.sec.gov that contains reports, proxy and information
statements and other information regarding registrants that file electronically
with the Commission.
 
    Upon completion of this offering, the Company will become subject to the
information and periodic reporting requirements of the Exchange Act and, in
accordance therewith, will file periodic reports, proxy and information
statements and other information with the Commission. Such periodic reports,
proxy and information statements and other information will be available for
inspection and copying at the regional offices, public reference facilities and
Web site of the Commission referred to above.
 
                                       79
<PAGE>
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<S>                                                                                    <C>
CONSOLIDATED FINANCIAL STATEMENTS OF HEALTHEON CORPORATION:
 
Report of Ernst & Young LLP, Independent Auditors....................................        F-2
 
Report of Deloitte & Touche LLP, Independent Auditors................................        F-3
 
Consolidated Balance Sheets..........................................................        F-4
 
Consolidated Statements of Operations................................................        F-5
 
Consolidated Statement of Convertible Redeemable Preferred Stock and Stockholders'
  Equity (Net Capital Deficiency)....................................................        F-6
 
Consolidated Statements of Cash Flows................................................        F-8
 
Notes to Consolidated Financial Statements...........................................        F-9
 
FINANCIAL STATEMENTS OF EDI SERVICES, INC.:
 
Report of Deloitte and Touche LLP, Independent Auditors..............................       F-31
 
Statement of Divisional Net Loss and United's Net Investment.........................       F-32
 
Statement of Divisional Cash Flows...................................................       F-33
 
Notes to Financial Statements........................................................       F-34
</TABLE>
 
                                      F-1
<PAGE>
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
 
Healtheon Corporation
 
    We have audited the accompanying consolidated balance sheets of Healtheon
Corporation as of December 31, 1996 and 1997, and June 30, 1998, and the related
consolidated statements of operations, convertible redeemable preferred stock
and stockholders' equity (net capital deficiency), and cash flows for each of
the two years in the period ended December 31, 1997, and for the six months
ended June 30, 1998. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits. In May 1998, the Company acquired
ActaMed Corporation in a transaction that was accounted for as a pooling of
interests. We did not audit the financial statements of ActaMed Corporation for
the year ended December 31, 1996, which statements reflect total assets
constituting approximately 82% of the related consolidated financial statement
totals at December 31, 1996 and revenues and a net loss constituting
approximately 89% and 54%, respectively, of the related consolidated financial
statement totals for the year ended December 31, 1996. Those statements were
audited by other auditors whose report has been furnished to us, and our
opinion, insofar as it relates to data included for ActaMed Corporation, is
based solely on the report of the other auditors. As discussed in Note 14, the
1996 consolidated financial statements of ActaMed Corporation have been
restated.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits and the report of the other auditors provide a
reasonable basis for our opinion.
 
    In our opinion, based on our audits and the report of the other auditors,
the financial statements referred to above present fairly, in all material
respects, the consolidated financial position of Healtheon Corporation at
December 31, 1996 and 1997, and June 30, 1998, and the consolidated results of
its operations and its cash flows for each of the two years in the period ended
December 31, 1997, and for the six months ended June 30, 1998, in conformity
with generally accepted accounting principles.
 
                                          /s/ ERNST & YOUNG LLP
 
Palo Alto, California
 
July 24, 1998,
 
except for Note 14, as to which the date is September 26, 1998
 
                                      F-2
<PAGE>
INDEPENDENT AUDITORS' REPORT
 
Board of Directors of ActaMed Corporation
 
    We have audited the consolidated balance sheet of ActaMed Corporation and
subsidiary (the "Company") as of December 31, 1996 and the related consolidated
statements of operations, convertible redeemable preferred stock and
stockholders' equity (net capital deficiency), and cash flows for each of the
two years in the period ended December 31, 1996 (the consolidated financial
statements for 1996 are not separately presented herein.) These financial
statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these consolidated financial
statements based on our audits.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our opinion, such consolidated financial statements present fairly, in
all material respects, the financial position of the Company as of December 31,
1996 and the results of its operations and its cash flows for each of the two
years in the period ended December 31, 1996 in conformity with generally
accepted accounting principles.
 
    As discussed in Note 14, the 1996 consolidated financial statements of
ActaMed Corporation and subsidiary (not separately presented herein) have been
restated.
 
/s/ DELOITTE & TOUCHE LLP
 
Atlanta, Georgia
June 20, 1997 (September 26, 1998 as to Note 14 and Note 1 -- Net Loss Per
Common Share, paragraph 2)
 
                                      F-3
<PAGE>
                             HEALTHEON CORPORATION
 
                          CONSOLIDATED BALANCE SHEETS
 
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                               DECEMBER 31,
                                                                                            ------------------   JUNE 30,
                                                                                              1996      1997       1998
                                                                                            --------  --------  -----------
                                                                                             (RESTATED -- SEE
                                                                                                 NOTE 14)
<S>                                                                                         <C>       <C>       <C>
                                                          ASSETS
Current assets:
  Cash and cash equivalents...............................................................  $  7,539  $ 16,504   $   11,075
  Short-term investments..................................................................        --     5,300        1,726
  Accounts receivable, net of allowance for doubtful accounts of $41, $71 and $135 in
    1996, 1997 and 1998, respectively.....................................................       959     2,723        3,726
  Due from related parties................................................................     1,742     1,533        1,916
  Other current assets....................................................................       437       527          353
                                                                                            --------  --------  -----------
  Total current assets....................................................................    10,677    26,587       18,796
Property and equipment, net...............................................................     4,534     5,500        9,960
Intangible assets, net....................................................................    16,555    18,768       18,183
Other assets..............................................................................     2,641     2,892        2,471
                                                                                            --------  --------  -----------
                                                                                            $ 34,407  $ 53,747   $   49,410
                                                                                            --------  --------  -----------
                                                                                            --------  --------  -----------
 
                               LIABILITIES AND STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)
Current liabilities:
  Borrowings under line of credit.........................................................  $     30  $  3,425   $    3,473
  Accounts payable........................................................................     1,359     2,225        3,133
  Accrued compensation....................................................................       242       448        1,853
  Other accrued liabilities...............................................................     1,097     1,265        2,765
  Current portion of capital lease obligations............................................       763     1,038        1,555
  Deferred revenue........................................................................     4,681     3,396        3,457
                                                                                            --------  --------  -----------
  Total current liabilities...............................................................     8,172    11,797       16,236
Capital lease obligations, net of current portion.........................................     1,210       932        1,459
Commitments
Convertible redeemable preferred stock, $.016 par value, issuable in series: 16,488,860
  shares authorized in 1996 and 1997, none in 1998; 14,170,947, 16,488,860 and no shares
  issued and outstanding in 1996, 1997 and 1998, respectively; at amounts paid in.........    39,578    50,948           --
Stockholders' equity (net capital deficiency):
  Convertible preferred stock, $.0001 par value, issuable in series: 48,020,000 shares
    authorized in 1996 and 1997, none in 1998; 13,285,000, 21,002,692 and no shares issued
    and outstanding in 1996, 1997 and 1998, respectively; at amounts paid in..............    11,607    43,756           --
  Common stock, $.0001 par value, 75,000,000 shares authorized; 8,652,422, 9,436,724 and
    51,704,947 shares issued and outstanding in 1996, 1997 and 1998, respectively.........         1         1            5
  Additional paid-in capital..............................................................     1,523     4,502      106,832
  Note receivable from officer............................................................        --      (349)          --
  Deferred stock compensation.............................................................        --    (2,151)      (3,411)
  Accumulated deficit.....................................................................   (27,684)  (55,689)     (71,711)
                                                                                            --------  --------  -----------
  Total stockholders' equity (net capital deficiency).....................................   (14,553)   (9,930)      31,715
                                                                                            --------  --------  -----------
                                                                                            $ 34,407  $ 53,747   $   49,410
                                                                                            --------  --------  -----------
                                                                                            --------  --------  -----------
</TABLE>
 
                            SEE ACCOMPANYING NOTES.
 
                                      F-4
<PAGE>
                    CONSOLIDATED STATEMENTS OF OPERATIONS(1)
 
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                      ACTAMED
                                                    CORPORATION                      HEALTHEON CORPORATION
                                                    ------------   ---------------------------------------------------------
                                                                           YEARS ENDED                SIX MONTHS ENDED
                                                                          DECEMBER 31,                    JUNE 30,
                                                                   ---------------------------   ---------------------------
                                                     YEAR ENDED
                                                    DECEMBER 31,
                                                        1995          1996             1997          1997             1998
                                                    ------------   ----------       ----------   ------------       --------
                                                                                                 (UNAUDITED)
                                                                           (RESTATED -- SEE NOTE 14)
<S>                                                 <C>            <C>              <C>          <C>                <C>
Revenue:
  Services........................................    $   458       $   1,795        $   4,301     $    656         $ 10,893
  Services to related parties(2)..................         --           4,237            7,309        3,240            9,370
  Software licenses...............................      1,717           4,981            1,780          390              390
                                                    ------------   ----------       ----------   ------------       --------
  Total revenue...................................      2,175          11,013           13,390        4,286           20,653
Operating costs and expenses:
  Cost of revenue:
    Cost of services..............................      1,573           1,648            4,011          598           10,770
    Cost of services to related parties...........         --           4,919            6,536        3,129            7,317
    Cost of software licenses.....................        343             160               --           --               --
                                                    ------------   ----------       ----------   ------------       --------
    Total cost of revenue.........................      1,916           6,727           10,547        3,727           18,087
  Development and engineering.....................      2,446           8,596           12,986        6,409            8,332
  Sales, general and administrative...............      1,749           9,042           11,031        4,723           12,123
  Amortization of intangible assets...............         --           3,189            4,249        2,124            3,938
                                                    ------------   ----------       ----------   ------------       --------
  Total operating costs and expenses..............      6,111          27,554           38,813       16,983           42,480
                                                    ------------   ----------       ----------   ------------       --------
Loss from operations..............................     (3,936)        (16,541)         (25,423)     (12,697)         (21,827)
Interest income...................................        208             539              611          254              637
Interest expense..................................         (6)            (56)            (323)        (128)            (251)
Dividends on ActaMed's convertible redeemable
  preferred stock.................................         --          (2,548)          (2,870)      (1,606)            (890)
                                                    ------------   ----------       ----------   ------------       --------
Net loss..........................................     (3,734)        (18,606)         (28,005)     (14,177)         (22,331)
Dividends on ActaMed's convertible redeemable
  preferred stock.................................       (724)             --               --           --               --
                                                    ------------   ----------       ----------   ------------       --------
Net loss applicable to common stockholders........    $(4,458)      $ (18,606)       $ (28,005)    $(14,177)        $(22,331)
                                                    ------------   ----------       ----------   ------------       --------
                                                    ------------   ----------       ----------   ------------       --------
Basic and diluted net loss per common share.......    $  (.85)      $   (2.83)       $   (3.88)    $  (1.97)        $  (1.27)
                                                    ------------   ----------       ----------   ------------       --------
                                                    ------------   ----------       ----------   ------------       --------
Weighted-average shares outstanding used in
  computing basic and diluted net loss per common
  share...........................................      5,246           6,583            7,223        7,193           17,632
                                                    ------------   ----------       ----------   ------------       --------
                                                    ------------   ----------       ----------   ------------       --------
Pro forma basic and diluted net loss per common
  share (unaudited)...............................                                   $    (.56)                     $   (.46)
                                                                                    ----------                      --------
                                                                                    ----------                      --------
Shares used in computing pro forma basic and
  diluted net loss per common share (unaudited)...                                      44,715                        46,631
                                                                                    ----------                      --------
                                                                                    ----------                      --------
</TABLE>
 
- ---------
 
(1) Because Healtheon did not commence operations until January 1996, the
    ActaMed statement of operations presented for the year ended December 31,
    1995 represents the statement of operations of Healtheon for that period on
    a pooled basis.
 
(2) Revenue from services to related parties consists of revenue from United
    HealthCare and SmithKline Labs, customers that are also significant
    stockholders of the Company.
 
                            SEE ACCOMPANYING NOTES.
 
                                      F-5
<PAGE>
      CONSOLIDATED STATEMENT OF CONVERTIBLE REDEEMABLE PREFERRED STOCK AND
                STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)(1)
 
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
                              ACTAMED CORPORATION
<TABLE>
<CAPTION>
                                               CONVERTIBLE
                                               REDEEMABLE             CONVERTIBLE
                                             PREFERRED STOCK        PREFERRED STOCK        COMMON STOCK
                                          ---------------------  ---------------------  ------------------
                                            SHARES      AMOUNT     SHARES      AMOUNT     SHARES    AMOUNT
                                          -----------  --------  -----------  --------  ----------  ------
<S>                                       <C>          <C>       <C>          <C>       <C>         <C>
BALANCES AT DECEMBER 31, 1994...........    8,800,880  $  8,343           --  $     --   8,250,000   $200
Net loss................................           --        --           --        --          --     --
Issuance of common stock pursuant to
  option exercises by employees.........           --        --           --        --   1,071,250     21
Issuance of Series B convertible
  redeemable preferred stock for cash
  (less issuance costs of $36)..........    3,448,276     6,963           --        --          --     --
Dividends accrued on convertible
  redeemable preferred stock............           --       724           --        --          --     --
                                          -----------  --------  -----------  --------  ----------  ------
BALANCES AT DECEMBER 31, 1995...........   12,249,156  $ 16,030           --  $     --   9,321,250   $221
                                          -----------  --------  -----------  --------  ----------  ------
                                          -----------  --------  -----------  --------  ----------  ------
 
<CAPTION>
                                                                                                     TOTAL
                                                          NOTE                                   STOCKHOLDERS'
                                          ADDITIONAL   RECEIVABLE     DEFERRED                    EQUITY (NET
                                           PAID-IN        FROM         STOCK       ACCUMULATED      CAPITAL
                                           CAPITAL      OFFICER     COMPENSATION     DEFICIT      DEFICIENCY)
                                          ----------   ----------   ------------   -----------   -------------
<S>                                       <C>          <C>          <C>            <C>           <C>
BALANCES AT DECEMBER 31, 1994...........   $   1,883     $  --        $    --       $ (5,344)      $ (3,261)
Net loss................................          --        --             --         (3,734)        (3,734)
Issuance of common stock pursuant to
  option exercises by employees.........          --        --             --             --             21
Issuance of Series B convertible
  redeemable preferred stock for cash
  (less issuance costs of $36)..........          --        --             --             --             --
Dividends accrued on convertible
  redeemable preferred stock............        (724)       --             --             --           (724)
                                          ----------     -----      ------------   -----------   -------------
BALANCES AT DECEMBER 31, 1995...........   $   1,159     $  --        $    --       $ (9,078)      $ (7,698)
                                          ----------     -----      ------------   -----------   -------------
                                          ----------     -----      ------------   -----------   -------------
</TABLE>
 
                             HEALTHEON CORPORATION
<TABLE>
<CAPTION>
<S>                                       <C>          <C>       <C>          <C>       <C>         <C>
BALANCES AT DECEMBER 31, 1995
  (REFLECTING THE EXCHANGE RATIO OF
  .6272)................................    7,682,671  $ 16,030           --  $     --   5,846,288   $  1
Net loss (Restated).....................           --        --           --        --          --     --
Issuance of common stock to founders and
  employees for cash....................           --        --           --        --   2,806,134     --
Issuance of Series A convertible
  preferred stock for cash (less
  issuance costs of $27)................           --        --   10,285,000     5,115          --     --
Issuance of Series B convertible
  preferred stock for cash (less
  issuance costs of $8).................           --        --    3,000,000     5,992          --     --
Issuance of Series B convertible
  preferred stock warrant to investor
  for services..........................           --        --           --       500          --     --
Issuance of Series C convertible
  redeemable preferred stock for
  acquisition...........................    6,488,276    21,000           --        --          --     --
Issuance of common stock warrants.......           --        --           --        --          --     --
Dividends accrued on convertible
  redeemable preferred stock............           --     2,548           --        --          --     --
                                          -----------  --------  -----------  --------  ----------  ------
BALANCES AT DECEMBER 31, 1996
  (RESTATED)............................   14,170,947    39,578   13,285,000    11,607   8,652,422      1
 
<CAPTION>
BALANCES AT DECEMBER 31, 1995
  (REFLECTING THE EXCHANGE RATIO OF
  .6272)................................   $   1,379     $  --        $    --       $ (9,078)      $ (7,698)
Net loss (Restated).....................          --        --             --        (18,606)       (18,606)
Issuance of common stock to founders and
  employees for cash....................         140        --             --             --            140
Issuance of Series A convertible
  preferred stock for cash (less
  issuance costs of $27)................          --        --             --             --          5,115
Issuance of Series B convertible
  preferred stock for cash (less
  issuance costs of $8).................          --        --             --             --          5,992
Issuance of Series B convertible
  preferred stock warrant to investor
  for services..........................          --        --             --             --            500
Issuance of Series C convertible
  redeemable preferred stock for
  acquisition...........................          --        --             --             --             --
Issuance of common stock warrants.......           4        --             --             --              4
Dividends accrued on convertible
  redeemable preferred stock............          --        --             --             --             --
                                          ----------     -----      ------------   -----------   -------------
BALANCES AT DECEMBER 31, 1996
  (RESTATED)............................       1,523        --             --        (27,684)       (14,553)
</TABLE>
 
- ------------
(1) Because Healtheon did not commence operations until January 1996, the
    ActaMed statement of convertible redeemable preferred stock and
    stockholders' equity (net capital deficiency) presented for the year ended
    December 31, 1995 represents the statement of stockholders' equity of
    Healtheon for that period on a pooled basis.
 
                            SEE ACCOMPANYING NOTES.
 
                                      F-6
<PAGE>
      CONSOLIDATED STATEMENT OF CONVERTIBLE REDEEMABLE PREFERRED STOCK AND
          STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)(1) (CONTINUED)
 
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
                             HEALTHEON CORPORATION
<TABLE>
<CAPTION>
                                               CONVERTIBLE
                                               REDEEMABLE             CONVERTIBLE
                                             PREFERRED STOCK        PREFERRED STOCK        COMMON STOCK
                                          ---------------------  ---------------------  ------------------
                                            SHARES      AMOUNT     SHARES      AMOUNT     SHARES    AMOUNT
                                          -----------  --------  -----------  --------  ----------  ------
<S>                                       <C>          <C>       <C>          <C>       <C>         <C>
BALANCES AT DECEMBER 31, 1996
  (RESTATED)............................   14,170,947  $ 39,578   13,285,000  $ 11,607   8,652,422   $  1
Net loss (Restated).....................           --        --           --        --          --     --
Issuance of common stock pursuant to
  option and restricted stock exercises
  by employees..........................           --        --           --        --   1,397,844     --
Repurchase of employee common stock.....           --        --           --        --    (613,542)    --
Issuance of Series A and Series B
  convertible preferred stock for
  services..............................           --        --       45,000        55          --     --
Issuance of Series B convertible
  preferred stock for cash..............           --        --       15,000        30          --     --
Issuance of Series B convertible
  preferred stock to officer for note
  receivable............................           --        --      250,000       500          --     --
Issuance of Series B convertible
  preferred stock warrants in connection
  with bridge financing.................           --        --           --        64          --     --
Issuance of Series C convertible
  preferred stock for cash and
  conversion of bridge note.............           --        --    2,600,000     6,500          --     --
Issuance of Series D convertible
  preferred stock for cash..............           --        --    4,807,692    25,000          --     --
Issuance of Series D convertible
  redeemable preferred stock for asset
  purchase..............................    2,317,913     8,500           --        --          --     --
Repayment of note receivable from
  officer...............................           --        --           --        --          --     --
Dividends accrued on convertible
  redeemable preferred stock............           --     2,870           --        --          --     --
Deferred stock compensation.............           --        --           --        --          --     --
Amortization of deferred stock
  compensation..........................           --        --           --        --          --     --
                                          -----------  --------  -----------  --------  ----------  ------
BALANCES AT DECEMBER 31, 1997
  (RESTATED)............................   16,488,860    50,948   21,002,692    43,756   9,436,724      1
Net loss................................           --        --           --        --          --     --
Issuance of common stock pursuant to
  option exercises by employees.........           --        --           --        --   1,659,685     --
Issuance of Series B convertible
  preferred stock pursuant to warrant
  exercises.............................           --        --    1,017,229     2,034          --     --
Issuance of Series D convertible
  redeemable preferred stock for asset
  purchase..............................      763,548     2,800           --        --          --     --
Dividends accrued on convertible
  redeemable preferred stock............           --       890           --        --          --     --
Conversion of redeemable preferred and
  preferred stock to common stock.......  (17,252,408)  (54,638) (22,019,921)  (45,790) 39,272,329      4
Issuance of common stock for asset
  purchase..............................           --        --           --        --   1,336,209     --
Repayment of note receivable from
  officer...............................           --        --           --        --          --     --
Deferred stock compensation.............           --        --           --        --          --     --
Amortization of deferred stock
  compensation..........................           --        --           --        --          --     --
                                          -----------  --------  -----------  --------  ----------  ------
BALANCES, JUNE 30, 1998.................           --  $     --           --  $     --  51,704,947   $  5
                                          -----------  --------  -----------  --------  ----------  ------
                                          -----------  --------  -----------  --------  ----------  ------
 
<CAPTION>
 
                                                                                                     TOTAL
                                                          NOTE                                   STOCKHOLDERS'
                                          ADDITIONAL   RECEIVABLE     DEFERRED                    EQUITY (NET
                                           PAID-IN        FROM         STOCK       ACCUMULATED      CAPITAL
                                           CAPITAL      OFFICER     COMPENSATION     DEFICIT      DEFICIENCY)
                                          ----------   ----------   ------------   -----------   -------------
<S>                                       <C>          <C>          <C>            <C>           <C>
BALANCES AT DECEMBER 31, 1996
  (RESTATED)............................   $  1,523         --             --       $(27,684)      $(14,553)
Net loss (Restated).....................         --         --             --        (28,005)       (28,005)
Issuance of common stock pursuant to
  option and restricted stock exercises
  by employees..........................        297         --             --             --            297
Repurchase of employee common stock.....        (31)        --             --             --            (31)
Issuance of Series A and Series B
  convertible preferred stock for
  services..............................         --         --             --             --             55
Issuance of Series B convertible
  preferred stock for cash..............         --         --             --             --             30
Issuance of Series B convertible
  preferred stock to officer for note
  receivable............................         --       (500)            --             --             --
Issuance of Series B convertible
  preferred stock warrants in connection
  with bridge financing.................         --         --             --             --             64
Issuance of Series C convertible
  preferred stock for cash and
  conversion of bridge note.............         --         --             --             --          6,500
Issuance of Series D convertible
  preferred stock for cash..............         --         --             --             --         25,000
Issuance of Series D convertible
  redeemable preferred stock for asset
  purchase..............................         --         --             --             --             --
Repayment of note receivable from
  officer...............................         --        151             --             --            151
Dividends accrued on convertible
  redeemable preferred stock............         --         --             --             --             --
Deferred stock compensation.............      2,713         --         (2,713)            --             --
Amortization of deferred stock
  compensation..........................         --         --            562             --            562
                                          ----------   ----------   ------------   -----------   -------------
BALANCES AT DECEMBER 31, 1997
  (RESTATED)............................      4,502       (349)        (2,151)       (55,689)        (9,930)
Net loss................................         --         --             --        (22,331)       (22,331)
Issuance of common stock pursuant to
  option exercises by employees.........        913         --             --             --            913
Issuance of Series B convertible
  preferred stock pursuant to warrant
  exercises.............................         --         --             --             --          2,034
Issuance of Series D convertible
  redeemable preferred stock for asset
  purchase..............................         --         --             --             --             --
Dividends accrued on convertible
  redeemable preferred stock............         --         --             --             --             --
Conversion of redeemable preferred and
  preferred stock to common stock.......     94,115         --             --          6,309         54,638
Issuance of common stock for asset
  purchase..............................      4,900         --             --             --          4,900
Repayment of note receivable from
  officer...............................         --        349             --             --            349
Deferred stock compensation.............      2,402         --         (2,402)            --             --
Amortization of deferred stock
  compensation..........................         --         --          1,142             --          1,142
                                          ----------   ----------   ------------   -----------   -------------
BALANCES, JUNE 30, 1998.................   $106,832      $  --        $(3,411)      $(71,711)      $ 31,715
                                          ----------   ----------   ------------   -----------   -------------
                                          ----------   ----------   ------------   -----------   -------------
</TABLE>
 
- -------------
 
(1) Because Healtheon did not commence operations until January 1996, the
    ActaMed statement of convertible redeemable preferred stock and
    stockholders' equity (net capital deficiency) presented for the year ended
    December 31, 1995 represents the statement of stockholders' equity of
    Healtheon for that period on a pooled basis.
 
                            SEE ACCOMPANYING NOTES.
 
                                      F-7
<PAGE>
                    CONSOLIDATED STATEMENTS OF CASH FLOWS(1)
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                            ACTAMED
                                                          CORPORATION                     HEALTHEON CORPORATION
                                                          ------------   --------------------------------------------------------
                                                                          YEARS ENDED DECEMBER 31,     SIX MONTHS ENDED JUNE 30,
                                                                         ---------------------------   --------------------------
                                                           YEAR ENDED
                                                          DECEMBER 31,
                                                              1995          1996             1997         1997             1998
                                                          ------------   ----------       ----------   -----------       --------
                                                                                                       (UNAUDITED)
                                                                                 (RESTATED -- SEE NOTE 14)
<S>                                                       <C>            <C>              <C>          <C>               <C>
Cash flows from operating activities:
Net loss................................................    $(3,734)      $(18,606)        $(28,005)    $(14,177)        $(22,331)
Adjustments to reconcile net loss to net cash used in
  operating activities:
  Depreciation and amortization.........................        359          6,366            9,319        4,609            8,093
  Amortization of deferred stock compensation...........         --             --              562           --            1,142
  Warrants and preferred stock issued for services......         --            500              119           55               --
  Dividends on ActaMed's convertible redeemable
    preferred stock.....................................         --          2,548            2,870        1,606              890
  Changes in operating assets and liabilities:
    Accounts receivable.................................        (36)        (5,066)            (806)         132             (988)
    Other assets........................................        (77)          (325)            (224)        (242)             197
    Accounts payable....................................         49          1,139              751         (263)             908
    Accrued compensation and other liabilities..........        516            800              345          573            2,905
    Deferred revenue....................................      1,603          3,078           (1,285)        (205)              61
                                                          ------------   ----------       ----------   -----------       --------
Net cash used in operating activities...................     (1,320)        (9,566)         (16,354)      (7,912)          (9,123)
                                                          ------------   ----------       ----------   -----------       --------
Cash flows from investing activities:
Purchase of short-term investments......................         --             --           (5,300)          --           (3,483)
Maturities of short-term investments....................         --             --               --           --            7,057
Increase in restricted cash.............................         --             --             (867)          --               --
Purchases of property and equipment.....................       (464)        (2,027)          (2,817)        (293)          (2,664)
Acquisition costs related to business combination.......         --           (316)              --           --               --
Capitalized internally developed software costs.........         --         (1,001)            (291)        (165)              --
                                                          ------------   ----------       ----------   -----------       --------
Net cash from (used in) investing activities............       (464)        (3,344)          (9,275)        (458)             910
                                                          ------------   ----------       ----------   -----------       --------
Cash flows from financing activities:
Proceeds from line of credit borrowings and bridge
  notes.................................................         --             30            5,395        2,765               48
Proceeds from line of credit borrowings from related
  party.................................................         --             --               --           --            1,000
Payments of line of credit borrowings from related
  party.................................................         --             --               --           --           (1,000)
Proceeds from issuance of preferred stock...............      6,963         11,107           29,530           96            2,034
Proceeds from issuance of common stock, net of
  repurchases...........................................         21            144              266          (10)             913
Payments on note receivable from officer................         --             --              151           --              349
Principal payments of capital lease obligations.........         --           (218)            (748)        (363)            (560)
                                                          ------------   ----------       ----------   -----------       --------
Net cash from financing activities......................      6,984         11,063           34,594        2,488            2,784
                                                          ------------   ----------       ----------   -----------       --------
Net increase (decrease) in cash and cash equivalents....      5,200         (1,847)           8,965       (5,882)          (5,429)
Cash and cash equivalents at beginning of period........      4,186          9,386            7,539        7,539           16,504
                                                          ------------   ----------       ----------   -----------       --------
Cash and cash equivalents at end of period..............    $ 9,386       $  7,539         $ 16,504     $  1,657         $ 11,075
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Supplemental disclosure of cash flow information:
Interest paid...........................................    $     5       $     56         $    252     $    128         $    269
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Supplemental schedule of noncash investing and financing
  activities:
Equipment acquired under capital lease obligations......    $    --       $  2,083         $    774     $    356         $  1,604
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Issuance of note receivable from officer for preferred
  stock.................................................    $    --       $     --         $    500     $     --         $     --
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Conversion of bridge notes to preferred stock...........    $    --       $     --         $  2,000     $     --         $     --
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Dividends on ActaMed's convertible redeemable preferred
  stock.................................................    $   724       $     --         $     --     $     --         $     --
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Issuance of convertible redeemable preferred stock for
  business combination..................................    $    --       $ 21,000         $     --     $     --         $     --
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Issuance of convertible redeemable preferred stock for
  assets purchased......................................    $    --       $     --         $  8,500     $     --         $  2,800
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Issuance of common stock for assets purchased...........    $    --       $     --         $     --     $     --         $  4,900
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Deferred stock compensation related to options
  granted...............................................    $    --       $     --         $  2,713     $     --         $  2,402
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
Conversion of convertible redeemable preferred and
  convertible preferred stock to common stock...........    $    --       $     --         $     --     $     --         $ 92,972
                                                          ------------   ----------       ----------   -----------       --------
                                                          ------------   ----------       ----------   -----------       --------
</TABLE>
 
- -------------
(1) Because Healtheon did not commence operations until January 1996, the
    statement of cash flows presented for the year ended December 31, 1995
    represents the statement of cash flows of Healtheon for that period on a
    pooled basis.
 
                            SEE ACCOMPANYING NOTES.
 
                                      F-8
<PAGE>
                             HEALTHEON CORPORATION
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    BASIS OF PRESENTATION
 
    In May 1998, Healtheon Corporation ("Healtheon") acquired ActaMed
Corporation ("ActaMed") in a merger transaction accounted for as a pooling of
interests (see Note 2). ActaMed was incorporated in 1992. Healtheon was
incorporated on December 26, 1995 and was considered to be in the development
stage through late 1997. All financial information has been restated to reflect
the combined operations of Healtheon and ActaMed. All 1995 financial statement
information represents that of ActaMed. Because Healtheon did not commence
operations until January 1996, the financial statements of ActaMed for the year
ended December 31, 1995 also represent the financial statements of Healtheon on
a pooled basis for that period. As used herein, the "Company" refers to the
combined companies and "Healtheon" or "ActaMed" is used to refer to the
individual pre-merger company where required for clarity of presentation.
 
    NATURE OF OPERATIONS
 
    The Company is pioneering the use of the Internet to simplify workflows,
decrease costs and improve the quality of patient care throughout the healthcare
industry. The Company has designed and developed an Internet-based information
and transaction platform (the "Healtheon Platform") that allows it to create
Virtual Healthcare Networks ("VHNs") that facilitate and streamline interactions
among the myriad participants in the healthcare industry. The Company's VHN
solution includes a suite of services delivered through applications operating
on its Internet-based platform. The Company's solution enables the secure
exchange of information among disparate healthcare information systems and
supports a broad range of healthcare transactions, including enrollment,
eligibility determination, referrals and authorization, laboratory and
diagnostic test ordering, clinical data retrieval and claims processing.
Healtheon provides its own applications on the Healtheon Platform and also
enables third-party applications to operate on the platform. In addition to
VHNs, Healtheon provides consulting, implementation and network management
services to enable its customers to take advantage of the capabilities of the
Healtheon Platform.
 
    The Company has incurred operating losses to date and had an accumulated
deficit of $71,711,000 at June 30, 1998. Company activities have been primarily
financed through private placements of equity securities. The Company had cash,
cash equivalents and short-term investments totaling approximately $12,801,000
at June 30, 1998. As noted above and as further discussed in Note 2, Healtheon
merged with ActaMed in May 1998. This merger may significantly affect the
Company's operating cash needs. The Company may need to raise additional capital
through the issuance of debt or equity securities. There can be no assurance
that the Company will be able to raise additional financing, or that such
financing will be available on terms satisfactory to the Company, if at all.
 
    INTERIM FINANCIAL INFORMATION
 
    The financial information for the six months ended June 30, 1997 is
unaudited but includes all adjustments, consisting only of normal recurring
adjustments, that the Company considers necessary for a fair presentation of the
Company's operating results and cash flows for such period. Results for the six
months ended June 30, 1998 are not necessarily indicative of results to be
expected for the full fiscal year of 1998 or for any future period.
 
                                      F-9
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    PRINCIPLES OF CONSOLIDATION
 
    The consolidated financial statements include the accounts of the Company
and its wholly owned subsidiaries. All significant intercompany balances and
transactions have been eliminated.
 
    ACCOUNTING ESTIMATES
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements. Actual
results could differ materially from these estimates.
 
    CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
 
    All highly liquid investments with an original maturity from date of
purchase of three months or less are considered to be cash equivalents. The
Company's cash, cash equivalents and short-term investments are invested in
various investment-grade commercial paper, money market accounts and
certificates of deposit. All of the Company's short-term investments mature
within six months. The fair value of the Company's cash equivalents and
short-term investments is as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31,       JUNE 30,
                                                              --------------------  -----------
                                                                1996       1997        1998
                                                              ---------  ---------  -----------
<S>                                                           <C>        <C>        <C>
Cash equivalents:
  Corporate and other nongovernment debt securities.........  $      --  $  12,704   $  10,380
  Money market funds........................................      5,603      3,429         864
                                                              ---------  ---------  -----------
                                                                  5,603     16,133      11,244
Short-term investments:
  Corporate and other nongovernment debt securities.........         --      5,300          --
  U.S. government securities................................         --         --       1,726
                                                              ---------  ---------  -----------
                                                              $   5,603  $  21,433   $  12,970
                                                              ---------  ---------  -----------
                                                              ---------  ---------  -----------
</TABLE>
 
    Net unrealized gains (losses) were immaterial at December 31, 1996 and 1997
and June 30, 1998.
 
    Management determines the appropriate classification of debt and equity
securities at the time of purchase and reevaluates such designation as of each
balance sheet date. Marketable debt and equity securities are classified as
available-for-sale, and are carried at their fair value, with the unrealized
gains and losses, when material, reported net-of-tax in a separate component of
stockholders' equity. Realized gains and losses and declines in value judged to
be other-than-temporary on available-for-sale securities are included in
interest income. The cost of securities sold is based on specific
identification. Interest and dividends on securities classified as
available-for-sale are included in investment income.
 
    Additionally, at December 31, 1997 and June 30, 1998, the Company had
restricted cash of $867,000, related to a letter of credit invested in a
certificate of deposit at a financial institution as a security deposit for its
office facilities (see Note 6). Such amount is included in other assets in the
accompanying consolidated balance sheets.
 
                                      F-10
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    PROPERTY AND EQUIPMENT
 
    Property and equipment are stated at cost, net of accumulated amortization
and depreciation. Depreciation is computed using the straight-line method over
the estimated useful life of the related asset, generally three to seven years.
Leasehold improvements and equipment acquired under capital leases are amortized
over the shorter of the lease term or the estimated useful life of the related
asset.
 
    INTANGIBLE ASSETS
 
    All intangible assets, which consist primarily of software technology
rights, intangibles related to services agreements and goodwill, are amortized
on a straight-line basis over three years.
 
    SOFTWARE DEVELOPMENT COSTS
 
    Software development costs are incurred in the development or enhancement of
software utilized in providing the Company's business management systems and
services. Software development costs incurred after the establishment of
technological feasibilty for each product or process are capitalized and
capitalization ceases when the product or process is available for general
release to customers or is put into service. Capitalized internally developed
software costs were approximately $1,001,000, $291,000 and $165,000 for the
years ended December 31, 1996 and 1997 and the six months ended June 30, 1997,
respectively. There were no internally developed software costs capitalized for
the year ended December 31, 1995 or for the six months ended June 30, 1998.
Capitalized internally developed software costs are amortized based on the
greater of the amount determined using the straight line method over the
estimated useful economic life of the software or the ratio of remaining
unamortized costs to current and expected future revenue from the software.
Amortization expense related to the Company's capitalized internally developed
software costs included in cost of revenue was approximately $134,000, $376,000,
$173,000 and $782,000 for the years ended December 31, 1996 and 1997 and the six
months ended June 30, 1997 and 1998, respectively. There was no amortization
expense related to ActaMed's capitalized internally developed software costs for
the year ended December 31, 1995.
 
    LONG-LIVED ASSETS
 
    The Company continually monitors events and changes in circumstances that
could indicate carrying amounts of long-lived assets, including intangible
assets, may not be recoverable. When such events or changes in circumstances are
present, the Company assesses the recoverability of long-lived assets by
determining whether the carrying value of such assets will be recovered through
undiscounted expected future cash flows. In June 1998, the Company evaluated the
carrying value of the capitalized internally developed software in light of the
changes in operations resulting from the acquisition of ActaMed by Healtheon.
The Company determined that it expected no future cash flows to be generated by
this software and, accordingly, wrote off the remaining unamortized balance of
$603,000 related to capitalized internally developed software. Such amount is
included in the $782,000 amortization expense for the six months ended June 30,
1998 noted above. No impairment losses were recorded for the years ended
December 31, 1995, 1996 and 1997 or for the six months ended June 30, 1997.
 
                                      F-11
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    REVENUE RECOGNITION
 
    The Company earns revenue from services and services to related parties,
both of which include providing access to its network-based services and
performing development and consulting services, and from licensing software. The
Company earns network-based services revenue from fixed fee subscription
arrangements, which is recognized ratably over the term of the applicable
agreement, and from arrangements that are priced on a per-transaction or
per-user basis, which is recognized as the services are performed. Revenue from
development projects is recognized on a percentage-of-completion basis or as
such services are performed, depending on the terms of the contract. Revenue
from consulting services is recognized as such services are performed. Cash
received in excess of revenue recognized relating to such services has been
recorded as deferred revenue in the accompanying consolidated balance sheets.
Revenue from services to related parties consists of services revenue
attributable to United HealthCare and SmithKline Labs. To date, the Company has
derived no significant revenue from brokers, value-added resellers or systems
integrators.
 
    During the year ended December 31, 1997, the Company entered into agreements
with two customers to manage and operate their current and expanding information
technology ("IT") operations, to develop a suite of specific Internet-based
commercial software applications and to assist these customers in migrating from
their current IT operating environment to these new applications. The Company
utilizes its own personnel, certain outside contractors and certain personnel
and facilities of the customers that are leased under contract terms to the
Company for these services. The cost of these leased customer personnel and
facilities is included as part of the total costs of the IT and development
services billed to the customers by the Company. For the year ended December 31,
1997 and the six months ended June 30, 1998, the Company recognized revenue of
approximately $2,100,000 and $7,304,000, respectively, for the IT services and
approximately $200,000 and $2,497,000, respectively, for the development
services. Included in the revenue recognized for IT services for the year ended
December 31, 1997 and the six months ended June 30, 1998 were amounts related to
leased personnel and facilities of $1,909,000 and $6,088,000, respectively,
which amounts were also included in cost of revenue for the respective periods.
 
    The Company recognizes revenue from license fees when a noncancelable
license agreement has been signed with a customer, the software product covered
by the license agreement has been delivered, there are no uncertainties
surrounding product acceptance, there are no significant future performance
obligations, the license fees are fixed and determinable and collection of the
license fees is considered probable. The Company's products do not require
significant customization.
 
    In October 1997, the American Institute of Certified Public Accountants
issued Statement of Position ("SOP") 97-2, "Software Revenue Recognition." SOP
97-2 is effective January 1, 1998 and generally requires revenue earned on
software arrangements involving multiple elements such as software products,
upgrades, enhancements, postcontract customer support, installation and training
to be allocated to each element based on the relative fair values of the
elements. There was no material change to the Company's accounting for revenue
as a result of the adoption of SOP 97-2.
 
    ActaMed entered into a national marketing and licensing agreement (the
"Agreement") with International Business Machines Corporation ("IBM") in 1995
that granted IBM a nonexclusive, nontransferable right to market ActaMed's
software and services for a total of $6,300,000. For the years
 
                                      F-12
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
ended December 31, 1995, 1996 and 1997, approximately $1,700,000, $3,400,000 and
$1,200,000, respectively, of this amount was recognized as software license
revenue upon delivery of the software. No software license revenue was
recognized under this agreement for the six months ended June 30, 1997 or 1998.
 
    In December 1996, the Company entered into a new agreement (the "License")
to license its newly granted patent to IBM. As part of the License, IBM agreed
to pay ActaMed $4,800,000 over a four-year period. Additionally, in conjunction
with the License, the Company issued IBM a five-year warrant to purchase 282,522
shares of the Company's common stock at a price of $7.97 per share. Because of
the extended payment terms and the Company's contentious relationship with IBM,
the Company concluded that the license fee was not assured of collection and,
accordingly, is recognizing this revenue as the proceeds are collected. For the
years ended December 31, 1996 and 1997 and the six months ended June 30, 1997
and 1998, the Company recognized revenue from the License of $995,000, $780,000,
$390,000 and $390,000, respectively. At December 31, 1997, amounts due from IBM
of $738,000 and $1,715,000 were included in accounts receivable and other
assets, respectively. At June 30, 1998, amounts due from IBM of $776,000 and
$1,318,000 were included in accounts receivable and other assets, respectively.
Deferred revenue at December 31, 1996 and 1997 and June 30, 1998 included
$3,121,000, $2,341,000 and $1,951,000, respectively, related to the License.
 
    FAIR VALUE OF FINANCIAL INSTRUMENTS
 
    The fair value for marketable debt securities is based on quoted market
prices. The carrying value of these securities approximates their fair value.
 
    The fair value of notes is estimated by discounting the future cash flows
using the current interest rates at which similar loans would be made to
borrowers with similar credit ratings and for the same remaining maturities. The
carrying value of the note receivable from an officer approximated its fair
value.
 
    The fair value of short-term and long-term capital lease obligations is
estimated based on current interest rates available to the Company for debt
instruments with similar terms, degrees of risk and remaining maturities. The
carrying values of these obligations approximate their respective fair values.
 
    CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS
 
    The Company currently derives a substantial portion of its consolidated
revenue from a few large customers, two of which are related parties. Two
customers represented 35% and 17% of the total balance of trade accounts
receivable and amounts due from related parties at December 31, 1997, and three
customers represented 31%, 19% and 15% of the total balance of trade accounts
receivable and amounts due from related parties at June 30, 1998. The Company
believes that the concentration of credit risk in its trade receivables, with
respect to its limited customer base, is substantially mitigated by the
Company's credit evaluation process. The Company does not require collateral. To
date, the Company's bad debt write-offs have not been significant. During the
years ended December 31, 1996 and 1997 and the six months ended June 30, 1998,
respectively, the Company added approximately $41,000, $35,000 and $66,000 to
its bad debt reserves. Total write-offs of uncollectible amounts were zero,
$5,000 and $2,000 in these periods, respectively.
 
                                      F-13
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    For the year ended December 31, 1995, one customer accounted for 85% of
consolidated revenue. For the year ended December 31, 1996, two customers
accounted for 46% and 38% of consolidated revenue. For the year ended December
31, 1997, two customers accounted for 55% and 15% of consolidated revenue. For
the six months ended June 30, 1998, four customers accounted for 28%, 23%, 22%
and 20% of consolidated revenue.
 
    The Company operates solely within one business segment, the development and
marketing of healthcare transaction and information services delivered over the
Internet, private intranets or other networks. Through June 30, 1998, the
Company had no export sales.
 
    ACCOUNTING FOR STOCK-BASED COMPENSATION
 
    The Company grants stock options for a fixed number of shares to employees
with an exercise price equal to the fair market value of the shares at the date
of grant. As permitted under Statement of Financial Accounting Standards
("SFAS") No. 123, "Accounting for Stock-Based Compensation," the Company
accounts for stock option grants to employees and directors in accordance with
APB Opinion No. 25, "Accounting for Stock Issued to Employees" ("APB No. 25").
 
    NET LOSS PER COMMON SHARE
 
    Basic net loss per common share and diluted net loss per common share are
presented in conformity with SFAS No. 128, "Earnings Per Share," for all periods
presented. Pursuant to the Securities and Exchange Commission Staff Accounting
Bulletin No. 98, common stock and convertible preferred stock issued or granted
for nominal consideration prior to the anticipated effective date of the
Company's initial public offering must be included in the calculation of basic
and diluted net loss per common share as if they had been outstanding for all
periods presented. To date, the Company has not had any issuances or grants for
nominal consideration.
 
    In accordance with SFAS No. 128, basic net loss per common share has been
computed using the weighted-average number of shares of common stock outstanding
during the period, less shares subject to repurchase. For the year ended
December 31, 1995, the weighted-average number of shares of ActaMed reflects the
effect of the exchange ratio of 0.6272. Basic pro forma net loss per common
share, as presented in the statements of operations, has been computed as
described above and also gives effect, under Securities and Exchange Commission
guidance, to the conversion of the convertible and convertible redeemable
preferred stock (using the if-converted method) from the original date of
issuance. On May 19, 1998, in connection with Healtheon's acquisition of
ActaMed, all outstanding shares of Healtheon's convertible preferred stock and
ActaMed's convertible redeemable preferred stock were converted into an
aggregate of 39,272,329 shares of common stock. There were no shares of
convertible or convertible redeemable preferred stock outstanding at June 30,
1998.
 
                                      F-14
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
 
    The following table presents the calculation of basic and diluted and pro
forma basic and diluted net loss per common share follows (in thousands, except
per share data):
 
<TABLE>
<CAPTION>
                                                         YEARS ENDED                  SIX MONTHS
                                                        DECEMBER 31,                ENDED JUNE 30,
                                               -------------------------------  ----------------------
                                                 1995       1996       1997        1997        1998
                                               ---------  ---------  ---------  -----------  ---------
                                                                                (UNAUDITED)
                                                              (RESTATED -- SEE NOTE 14)
<S>                                            <C>        <C>        <C>        <C>          <C>
Net loss applicable to common stockholders...  $  (4,458) $ (18,606) $ (28,005)  $ (14,177)  $ (22,331)
                                               ---------  ---------  ---------  -----------  ---------
                                               ---------  ---------  ---------  -----------  ---------
Basic and diluted:
  Weighted-average shares of common stock
    outstanding..............................      5,246      7,398      8,621       8,469      18,999
  Less: Weighted-average shares subject to
    repurchase...............................         --       (815)    (1,398)     (1,276)     (1,367)
                                               ---------  ---------  ---------  -----------  ---------
Weighted-average shares used in computing
  basic and diluted net loss per common
  share......................................      5,246      6,583      7,223       7,193      17,632
                                               ---------  ---------  ---------  -----------  ---------
                                               ---------  ---------  ---------  -----------  ---------
Basic and diluted net loss per common
  share......................................  $    (.85) $   (2.83) $   (3.88)  $   (1.97)  $   (1.27)
                                               ---------  ---------  ---------  -----------  ---------
                                               ---------  ---------  ---------  -----------  ---------
Pro forma:
Net loss applicable to common stockholders...                        $ (28,005)              $ (22,331)
Add: Dividends on ActaMed convertible
  redeemable preferred stock.................                            2,870                     890
                                                                     ---------               ---------
Pro forma net loss...........................                        $ (25,135)              $ (21,441)
                                                                     ---------               ---------
                                                                     ---------               ---------
Shares used above............................                            7,223                  17,632
Pro forma adjustment to reflect weighted
  effect of assumed conversion of convertible
  preferred stock............................                           37,492                  28,999
                                                                     ---------               ---------
Shares used in computing pro forma basic and
  diluted net loss per common share
  (unaudited)................................                           44,715                  46,631
                                                                     ---------               ---------
                                                                     ---------               ---------
Pro forma basic and diluted net loss per
  common share (unaudited)...................                        $    (.56)              $    (.46)
                                                                     ---------               ---------
                                                                     ---------               ---------
</TABLE>
 
    The Company has excluded all convertible redeemable preferred stock,
convertible preferred stock, warrants, outstanding stock options and shares
subject to repurchase by the Company from the calculation of diluted loss per
common share because all such securities are anti-dilutive for all periods
presented. The total numbers of shares excluded from the calculations of diluted
loss per share were 10,157,109, 36,643,084, 51,216,689, 36,450,074 and
12,379,402 for the years ended December 31, 1995, 1996 and 1997 and the six
months ended June 30, 1997 and 1998, respectively. See Notes 9, 10 and 11 for
further information on these securities.
 
    In addition, subsequent to June 30, 1998, the Company granted to employees
options to purchase common stock and issued shares of common stock pursuant to
restricted stock agreements equal to a total
 
                                      F-15
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
of 3,433,500 shares and issued 1,600,000 shares of common stock in August 1998
in connection with the acquisition of Metis, LLC of which 476,548 shares will be
issued to employees pursuant to restricted stock purchase agreements subject to
a lapsing right of repurchase at the option of the Company, over the agreements'
respective vesting periods. See Notes 15 and 16.
 
    COMPREHENSIVE LOSS
 
    The Company has no material components of other comprehensive loss.
 
    RECENT ACCOUNTING PRONOUNCEMENTS
 
    In June 1997, the Financial Accounting Standards Board ("FASB") issued SFAS
No. 131, "Disclosures about Segments of an Enterprise and Related Information."
The Company is required to adopt SFAS No. 131 for the year ending December 31,
1998. SFAS No. 131 requires disclosure of certain information regarding
operating segments, products and services, geographic areas of operation and
major customers. Adoption of SFAS No. 131 is expected to have no material impact
on the Company's financial position, results of operations or cash flows.
 
    In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities." The Company is required to adopt SFAS No.
133 for the year ending December 31, 2000. SFAS No. 133 establishes methods of
accounting for derivative financial instruments and hedging activities related
to those instruments as well as other hedging activities. Because the Company
currently holds no derivative financial instruments and does not currently
engage in hedging activities, adoption of SFAS No. 133 is expected to have no
material impact on the Company's financial position, results of operations or
cash flows.
 
2. BUSINESS COMBINATIONS
 
    ACQUISITION OF EDI SERVICES, INC.
 
    Effective March 31, 1996, ActaMed acquired EDI Services Inc. ("EDI"), a
wholly-owned subsidiary of United HealthCare Corporation ("United HealthCare"),
in a transaction pursuant to which EDI became a wholly-owned subsidiary of
ActaMed. ActaMed issued 6,488,276 shares of Series C convertible redeemable
preferred stock with a fair value of $21,000,000 and incurred
acquisition-related costs of approximately $316,000 in connection with the
acquisition. EDI is a provider of electronic data interchange services to health
care providers and has marketed its health care network product, ProviderLink,
to providers of United HealthCare's local health plans since 1992.
 
    In connection with the acquisition, United HealthCare and ActaMed entered
into a five-year Services and License Agreement pursuant to which the Company
earns transaction fee revenue by providing certain health care information
services to United HealthCare and its provider network and ProviderLink
subscribers.
 
    The acquisition was accounted for as a purchase. Accordingly, the operations
of EDI were included in the Company's consolidated statements of operations only
after March 31, 1996. Assets and liabilities acquired in connection with this
acquisition were recorded at their estimated fair market values.
 
                                      F-16
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
2. BUSINESS COMBINATIONS (CONTINUED)
   
Approximately $359,000 of the purchase price was allocated to certain equipment
and the remaining approximately $20,957,000 of the purchase price was allocated
to intangible assets, consisting principally of software technology rights, the
Services and License Agreement, trademarks and goodwill. In previously issued
financial statements of ActaMed for the year ended December 31, 1996, $5,215,000
of the intangible asset amount was written off as in process research and
development costs. This amount has been reallocated to software technology
rights and the related amounts in the consolidated financial statements have
been restated as described in Note 14.
    
 
    Intangible assets arising from the acquisition of EDI at March 31, 1996 are
summarized as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                                    RESTATED --
                                                               AMORTIZATION PERIOD  SEE NOTE 14
                                                               -------------------  -----------
<S>                                                            <C>                  <C>
Goodwill.....................................................         3 years        $   8,012
Software technology rights...................................         3 years            8,333
Service and License Agreement................................         3 years            2,855
Trademarks...................................................         3 years              216
Other intangibles............................................         3 years            1,541
                                                                                    -----------
                                                                                     $  20,957
                                                                                    -----------
                                                                                    -----------
</TABLE>
 
    The following pro forma information gives effect to the acquisition of EDI
as if such transaction had occurred as of the beginning of each respective year
(in thousands, except per share data):
 
<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                                       ------------------------
                                                          1995         1996
                                                       -----------  -----------
                                                                    (UNAUDITED,
                                                                    RESTATED --
                                                                     SEE NOTE
                                                                        14)
                                                       (UNAUDITED)
<S>                                                    <C>          <C>
Net revenue..........................................   $   6,330    $  12,031
                                                       -----------  -----------
                                                       -----------  -----------
Net loss applicable to common stockholders...........   $ (11,475)   $ (20,492)
                                                       -----------  -----------
                                                       -----------  -----------
Basic and diluted net loss per common share..........   $   (2.19)   $   (3.11)
                                                       -----------  -----------
                                                       -----------  -----------
</TABLE>
 
    ACQUISITION OF ACTAMED CORPORATION
 
    On May 19, 1998, the Company completed its acquisition of ActaMed, a Georgia
corporation that develops and markets an integrated health care network, in a
transaction that has been accounted for as a pooling of interests. Accordingly,
the financial information presented reflects the combined financial position and
operations of the Company and ActaMed for all dates and periods presented. The
Company issued 23,271,355 shares of its common stock in exchange for all of the
outstanding shares of common and convertible redeemable preferred stock of
ActaMed. The Company also assumed all outstanding stock options and warrants to
acquire 3,383,011 shares of ActaMed capital stock, after giving effect to the
exchange ratio.
 
                                      F-17
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
2. BUSINESS COMBINATIONS (CONTINUED)
    Separate results of the combined entities for the years ended December 31,
1995, 1996 and 1997 and the four months ended April 30, 1998 (period ended
immediately prior to the acquisition) were as follows (in thousands, unaudited):
 
   
<TABLE>
<CAPTION>
                                                                                                      FOUR MONTHS
                                                                       YEARS ENDED DECEMBER 31,          ENDED
                                                                   ---------------------------------   APRIL 30,
                                                                     1995        1996        1997         1998
                                                                   ---------  ----------  ----------  ------------
                                                                              (RESTATED -- SEE NOTE
                                                                                       14)
<S>                                                                <C>        <C>         <C>         <C>
Revenue:
  Healtheon......................................................  $      --  $    1,200  $    3,199   $    6,405
  ActaMed........................................................      2,175       9,813      10,191        6,690
                                                                   ---------  ----------  ----------  ------------
                                                                   $   2,175  $   11,013  $   13,390   $   13,095
                                                                   ---------  ----------  ----------  ------------
                                                                   ---------  ----------  ----------  ------------
Net loss:
  Healtheon......................................................  $      --  $   (8,543) $  (13,979)  $   (6,664)
  ActaMed........................................................     (3,734)    (10,063)    (14,026)      (6,186)
                                                                   ---------  ----------  ----------  ------------
                                                                   $  (3,734) $  (18,606) $  (28,005)  $  (12,850)
                                                                   ---------  ----------  ----------  ------------
                                                                   ---------  ----------  ----------  ------------
</TABLE>
    
 
    There were no significant intercompany transactions between the two
companies or significant conforming accounting adjustments.
 
3. SERVICES AGREEMENT WITH SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC.
 
    Effective December 31, 1997, the Company entered into a series of agreements
with SmithKline Beecham Clinical Laboratories, Inc. ("SmithKline") to outsource
the network connection between their customers and SmithKline laboratories. In
connection with this transaction, SmithKline and the Company entered into a
five-year Services Agreement pursuant to which the Company will earn transaction
fee revenue by providing certain health care information services to SmithKline
and its provider customers.
 
    As part of that transaction, the Company acquired a license to SBCL SCAN
software and computer workstations that reside in various medical providers'
offices. At December 31, 1997, the SCAN license and the assets from one region
of the country were transferred to the Company for $2,000,000 in cash and
2,317,913 shares of Series D convertible redeemable preferred stock valued at
$8,500,000. In March and June 1998, the assets for the remaining regions of the
country were transferred to the Company and the Company paid the remaining
purchase price of $7,700,000 through the issuance of 763,548 shares of the
Company's Series D convertible redeemable preferred stock in March and 1,336,209
shares of the Company's common stock in June. The value of the services
agreement and the SCAN software license totaled $14,774,000, and the value of
the computer workstations totaled $3,426,000.
 
    SmithKline determined there was substantial benefit to their existing
customers and potential marketing advantages in attracting new customers, if the
SCAN software was upgraded to a new technology platform. Accordingly, in 1998
SmithKline entered into a development agreement with the Company to upgrade the
technology. Payments to the Company are based upon achieving certain milestones
in the development effort. At June 30, 1998 the Company had not achieved any
milestones and
 
                                      F-18
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
3. SERVICES AGREEMENT WITH SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC.
(CONTINUED)
had not received any payments from SmithKline. Accordingly, no development
revenue had been recognized by the Company under this development agreement.
 
4. PROPERTY AND EQUIPMENT
 
    Property and equipment consisted of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                               --------------------   JUNE 30,
                                                                 1996       1997        1998
                                                               ---------  ---------  -----------
<S>                                                            <C>        <C>        <C>
Computer equipment...........................................  $   3,677  $   6,238   $  10,584
Office equipment, furniture and fixtures.....................      1,185      1,237       2,330
Purchased software for internal use..........................      1,001      1,240       1,393
Leasehold improvements.......................................        303        328       1,255
                                                               ---------  ---------  -----------
                                                                   6,166      9,043      15,562
Less accumulated depreciation and amortization...............     (1,632)    (3,543)     (5,602)
                                                               ---------  ---------  -----------
Property and equipment, net..................................  $   4,534  $   5,500   $   9,960
                                                               ---------  ---------  -----------
                                                               ---------  ---------  -----------
</TABLE>
 
    Included in property and equipment at December 31, 1996 and 1997 and June
30, 1998 were assets acquired under capital lease obligations with a cost of
approximately $2,302,000, $3,075,000 and $4,603,000, respectively. Accumulated
depreciation related to the assets acquired under capital leases totaled
$319,000, $1,174,000 and $1,613,000 at December 31, 1996 and 1997 and June 30,
1998, respectively.
 
5. INTANGIBLE ASSETS
 
    Intangible assets consist of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                    DECEMBER 31,
                                                              ------------------------  JUNE 30,
                                         AMORTIZATION PERIOD     1996         1997        1998
                                         -------------------  -----------  -----------  ---------
                                                               (RESTATED -- SEE NOTE
                                                                        14)
<S>                                      <C>                  <C>          <C>          <C>
Services agreements....................         3 years        $   2,855    $   2,855   $   2,855
Software technology rights.............         3 years            8,333       17,664      23,107
Internally developed software..........         3 years            1,001        1,292          --
Trademarks.............................         3 years              216          216         216
Goodwill...............................         3 years            8,012        8,012       8,012
Other..................................         3 years            1,541        1,541       1,541
                                                              -----------  -----------  ---------
                                                                  21,958       31,580      35,731
Less accumulated amortization..........                           (5,403)     (12,812)    (17,548)
                                                              -----------  -----------  ---------
                                                               $  16,555    $  18,768   $  18,183
                                                              -----------  -----------  ---------
                                                              -----------  -----------  ---------
</TABLE>
 
                                      F-19
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
6. COMMITMENTS
 
    The Company has entered into several lease lines of credit. Lease lines
totaling $3,500,000 and $2,000,000 were entered into during the years ended
December 31, 1996 and 1997, respectively. Approximately $2,900,000 and
$4,461,000 had been utilized under these lease lines through December 31, 1997
and June 30, 1998, respectively. At June 30, 1998, approximately $1,750,000 was
available for future utilization under these lease lines. This amount included
approximately $711,000 that was repaid under the terms of a revolving lease line
and is thus again available for future utilization. The arrangements are secured
by the property and equipment subject to the leases. The term of the leases is
generally three years and the interest rates implicit in the leases range from
16.9% to 20.2% per annum. Information on payments due under these lease lines is
included in the table below under "Capital Leases."
 
    The Company leases its headquarters and other office facilities under
operating lease agreements that expire at various dates through 2008. Total rent
expense for all operating leases was approximately $391,000, $953,000,
$1,646,000, $756,000 and $1,052,000 for the years ended December 31, 1995, 1996
and 1997 and the six months ended June 30, 1997 and 1998, respectively, net of
sublease income from a related party of approximately $30,000, $68,000, $27,000,
$27,000 and $32,000, respectively. Future minimum lease commitments under
noncancelable lease agreements at June 30, 1998 were as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                                   CAPITAL
                                                              OPERATING LEASES     LEASES
                                                              ----------------  -------------
<S>                                                           <C>               <C>
Year ending December 31,
  1998......................................................     $    1,226       $     885
  1999......................................................          2,188           1,457
  2000......................................................          2,175             811
  2001......................................................          1,461             230
  2002......................................................            963              --
  Thereafter................................................          5,263              --
                                                                    -------     -------------
Total minimum lease payments................................     $   13,276           3,383
                                                                    -------
                                                                    -------
Amount representing interest................................                           (369)
                                                                                -------------
Present value of minimum lease payments under capital lease
  obligations...............................................                          3,014
Less current portion........................................                         (1,555)
                                                                                -------------
Non-current portion.........................................                      $   1,459
                                                                                -------------
                                                                                -------------
</TABLE>
 
7. BRIDGE LOANS AND NOTE RECEIVABLE FROM OFFICER
 
    In 1997, the Company borrowed $2,000,000 from certain stockholders in the
form of 6% convertible promissory notes (the "Notes") in contemplation of the
Series C convertible preferred stock offering. The Notes were converted into
800,000 shares of Series C convertible preferred stock upon the closing of that
offering. Warrants to purchase 61,947 shares of Series B convertible preferred
stock were issued in connection with the Notes (see Note 10).
 
    In July 1997, in consideration of 250,000 shares of the Company's Series B
convertible preferred stock issued to an officer, the Company received a
one-year, full-recourse, noninterest-bearing promissory note
 
                                      F-20
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
7. BRIDGE LOANS AND NOTE RECEIVABLE FROM OFFICER (CONTINUED)
 
for $500,000. At December 31, 1997, $349,000 remained outstanding under the
note. At June 30, 1998, the note had been paid in full.
 
    In February 1998, the Company entered into a $2,000,000 line of credit
agreement with a stockholder. The Company borrowed $1,000,000 under the
agreement, which was repaid with interest at 10% per annum in May 1998.
 
8. LINES OF CREDIT
 
    In September 1997, the Company entered into a line of credit agreement with
a bank that allows the Company to borrow up to $2,101,000. Amounts borrowed
under this agreement bear interest at the bank's prime rate (8.5% at December
31, 1997 and June 30, 1998). Interest is payable monthly with payments
commencing on September 30, 1997. The line of credit availability declines over
the term to $1,821,000, $1,215,000 and $547,000 at December 31, 1997, 1998 and
1999, respectively, and expires on September 5, 2000. The amount outstanding is
collateralized by certain assets. At December 31, 1997 and June 30, 1998,
$1,425,000 was outstanding under the agreement.
 
    In December 1997, the Company entered into a loan agreement with a bank that
allows the Company to borrow up to $2,250,000. Amounts borrowed under this loan
agreement bear interest at the bank's prime rate (8.5% at December 31, 1997).
The loan was personally guaranteed by one of the Company's stockholders until
the acquisition of ActaMed in May 1998. In May 1998, concurrent with the removal
of the stockholder guarantee, the interest rate was increased to the bank's
prime rate plus 1.5% (10% at June 30, 1998). Interest is payable monthly with
payments commencing on January 31, 1998. The principal balance of the loan is
due on December 31, 1998. At December 31, 1997 and June 30, 1998, $2,000,000 was
outstanding under the loan agreement.
 
9. CONVERTIBLE REDEEMABLE PREFERRED STOCK
 
    A summary of ActaMed's 8% cumulative convertible redeemable preferred stock
is as follows.
 
<TABLE>
<CAPTION>
                                                           DECEMBER 31,
                                     --------------------------------------------------------
                                                1996                         1997
                                     ---------------------------  ---------------------------
                                        ISSUED                       ISSUED
                          SHARES         AND        LIQUIDATION       AND        LIQUIDATION
                        AUTHORIZED   OUTSTANDING    PREFERENCE    OUTSTANDING    PREFERENCE
                       ------------  ------------  -------------  ------------  -------------
<S>                    <C>           <C>           <C>            <C>           <C>
Series A.............     5,519,912     5,519,912  $   9,825,000     5,519,912  $  10,458,000
Series B.............     2,162,759     2,162,759      7,614,000     2,162,759      8,171,000
Series C.............     6,488,276     6,488,276     22,257,000     6,488,276     23,936,000
Series D.............     2,317,913            --             --     2,317,913      8,500,000
                       ------------  ------------  -------------  ------------  -------------
                         16,488,860    14,170,947  $  39,696,000    16,488,860  $  51,065,000
                       ------------  ------------  -------------  ------------  -------------
                       ------------  ------------  -------------  ------------  -------------
</TABLE>
 
    In March 1998, an additional 763,548 shares of Series D convertible
redeemable preferred stock were issued in connection with the asset acquisition
from SmithKline Labs (see Note 3).
 
                                      F-21
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
9. CONVERTIBLE REDEEMABLE PREFERRED STOCK (CONTINUED)
    Dividends on each Series were cumulative whether or not declared and are
shown as a charge against income in the accompanying financial statements. On
May 19, 1998, in connection with the acquisition of ActaMed by Healtheon, the
convertible redeemable preferred stockholders waived payment of all accrued and
unpaid dividends.
 
    Preferred holders voted generally on an as-if converted basis. In addition,
a majority approval of the four Series was required to approve certain
transactions.
 
    The Series A, B, C and D cumulative convertible redeemable preferred
stockholders were entitled to receive, upon liquidation, an amount per share
equal to the issuance price, plus all accrued but unpaid dividends. Common
stockholders would then have received $5,000,000. Any remaining proceeds would
then have been distributed pro rata to the stockholders, subject only to the
Series A holders' right to receive sufficient funds to provide a 20% return on
their original investment.
 
    Each Series was redeemable at up to one-third of the originally issued
shares per year commencing in years six, seven and eight after the issue date at
a redemption price equal to the issue price plus all accrued but unpaid
dividends. On May 19, 1998, all outstanding shares of convertible redeemable
preferred stock were converted into 17,252,408 shares of common stock in
connection with the acquisition of ActaMed by the Company.
 
10. STOCKHOLDERS' EQUITY
 
    CONVERTIBLE PREFERRED STOCK
 
    The Company was authorized to issue 48,020,000 shares of convertible
preferred stock, designated in series. A summary of convertible preferred stock
was as follows:
 
<TABLE>
<CAPTION>
                                                           DECEMBER 31,
                                     --------------------------------------------------------
                                                1996                         1997
                                     ---------------------------  ---------------------------
                                        ISSUED                       ISSUED
                          SHARES         AND        LIQUIDATION       AND        LIQUIDATION
                        DESIGNATED   OUTSTANDING    PREFERENCE    OUTSTANDING    PREFERENCE
                       ------------  ------------  -------------  ------------  -------------
<S>                    <C>           <C>           <C>            <C>           <C>
Series A.............    10,305,000    10,285,000  $   5,143,000    10,305,000  $   5,153,000
Series B.............     6,105,000     3,000,000      6,000,000     3,290,000      6,580,000
Series C.............     2,600,000            --             --     2,600,000      6,500,000
Series D.............     5,000,000            --             --     4,807,692     25,000,000
                       ------------  ------------  -------------  ------------  -------------
                         24,010,000    13,285,000  $  11,143,000    21,002,692  $  43,233,000
                       ------------  ------------  -------------  ------------  -------------
                       ------------  ------------  -------------  ------------  -------------
</TABLE>
 
    Series A and Series B convertible preferred shares included 20,000 and
25,000 shares, respectively, that were issued for services rendered.
 
    On May 19, 1998, all outstanding shares of convertible preferred stock were
converted into shares of common stock on a one-for-one basis at the election of
the holders in connection with the Company's acquisition of ActaMed.
Concurrently with the conversion, all outstanding warrants to purchase Series B
preferred stock were converted into warrants to purchase the same number of
shares of the Company's common stock. At June 30, 1998, the Company had no
preferred stock authorized.
 
                                      F-22
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
10. STOCKHOLDERS' EQUITY (CONTINUED)
    Series A, B, C and D convertible preferred stockholders were entitled to
noncumulative dividends of $0.03375, $0.135, $0.16875 and $0.351, respectively,
per share per annum. No dividends were declared through the date of conversion.
The Series A, B, C and D convertible preferred stockholders were entitled to
receive, upon liquidation, an amount per share equal to the issuance price, plus
all declared but unpaid dividends. The Series A, B, C and D convertible
preferred stockholders had voting rights equal to the common shares issuable
upon conversion.
 
    WARRANTS
 
    In November 1996, the Company issued a warrant to a venture capital investor
to purchase 1,000,000 shares of Series B convertible preferred stock at an
exercise price of $2.00 per share for services rendered by the investor on
behalf of the Company. A then partner of the venture capital firm assumed the
role of President and Chief Executive Officer for the Company from the Company's
inception through June 1997. The warrant was immediately exercisable and expires
three years from the date of issuance. The Company recorded a charge of $500,000
representing the fair value of the warrant issued and services received based on
a valuation obtained by the Company from an independent appraiser utilizing a
modified Black-Scholes option pricing model. This warrant was outstanding at
December 31, 1997 and in May 1998 was converted to a warrant to purchase common
stock. It remained outstanding at June 30, 1998.
 
    In November 1996, the Company granted a warrant to a director of the Company
to purchase 1,000,000 shares of Series B convertible preferred stock at an
exercise price of $2.00 per share, the fair value of Series B convertible
preferred stock at the date of issuance. The warrant vests over a period of 18
months from the date of issuance. The term of the warrant is three years. This
warrant was outstanding at December 31, 1997 and was exercised in full in May
1998.
 
    In December 1996, the Company issued a warrant to a customer to purchase
282,522 shares of the Company's common stock at a price of $7.97 per share. The
warrant expires in December 2001. This warrant was outstanding at June 30, 1998.
 
    In July 1997, the Company issued a warrant to an officer of the Company, in
connection with his employment, to purchase 750,000 shares of Series B
convertible preferred stock at an exercise price of $2.00 per share, the fair
value of Series B convertible preferred stock at the date of issuance. The
warrant expires three years from issuance, and shares purchased under the
warrant are subject to repurchase by the Company, at the Company's option, upon
termination of employment. Shares under the warrant vest ratably over a period
of two years from the date of grant. This warrant was outstanding at December
31, 1997 and in May 1998 was converted to a warrant to purchase common stock. It
remained outstanding at June 30, 1998.
 
    In July 1997, the Company issued warrants to purchase a total of 61,947
shares of Series B convertible preferred stock to certain investors in
connection with a bridge financing. The warrants expire four years from issuance
and are exercisable at $2.00 per share. The value of these warrants,
approximately $64,000, was expensed as a cost of financing. All of these
warrants were outstanding at December 31, 1997. In May 1998, warrants to
purchase 17,229 shares of Series B convertible preferred stock were exercised
and the remainder of the warrants, which were outstanding at June 30, 1998, were
converted to warrants to purchase 44,718 shares of common stock.
 
                                      F-23
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
10. STOCKHOLDERS' EQUITY (CONTINUED)
    At December 31, 1997 the Company had reserved 2,811,947 and 282,522 shares
of its Series B preferred stock and common stock, respectively, for issuance
upon exercise of outstanding warrants. In conjunction with the acquisition of
ActaMed in May 1998, all outstanding warrants to purchase Series B preferred
stock were converted into warrants to purchase common stock. At June 30, 1998,
the Company had reserved 2,077,240 shares of its common stock for issuance upon
exercise of the outstanding warrants for common stock.
 
    In addition, as part of a service agreement with a customer, the Company
will issue to the customer a warrant to purchase 500,000 shares of the Company's
Common Stock with an exercise price of $10.40 per share. The terms and
conditions of the warrant are currently being negotiated.
 
11. STOCK-BASED COMPENSATION
 
    STOCK OPTION PLANS
 
   
    Under the 1996 Stock Plan (the "1996 Plan"), which was adopted in February
1996, the Board of Directors may grant options to purchase common stock or issue
common stock subject to a restricted stock purchase agreement to eligible
participants. At December 31, 1997, a total of 9,000,000 shares had been
reserved under the Plan. In March 1998, the Board of Directors and the
stockholders approved an increase in the reserve of 1,000,000 shares; in July
1998, the Board of Directors approved and in October 1998, the stockholders also
approved an additional increase in the reserve of 5,000,000 shares to a total of
15,000,000 shares reserved. Options granted may be either incentive stock
options or nonstatutory stock options and are exercisable within the times or
upon the events determined by the Board of Directors as specified in each option
agreement. Options vest over a period of time as determined by the Board of
Directors, generally four years. The term of the 1996 Plan is ten years. At
December 31, 1997 and June 30, 1998, 274,166 and 22,523 shares, respectively,
remained available for future grant under the 1996 Plan.
    
 
    In connection with the acquisition of ActaMed, the Company assumed all the
outstanding options issued under the ActaMed stock option plans, after the
application of the exchange ratio, and reserved 3,100,489 shares of the
Company's common stock for issuance upon exercise of the assumed options. No
further options can be granted under these plans. At the time of the
acquisition, options for 2,717,269 shares were fully vested. The remainder of
the shares vest based upon annual cliffs over a five-year period from the date
of grant.
 
    During the years ended December 31, 1996 and 1997, the Company issued
approximately 1,806,000 and 850,000 shares, respectively, of common stock
subject to restricted stock purchase agreements to employees for cash. No such
shares were issued during the six months ended June 30, 1998. The common stock
is subject to repurchase at the original exercise price until vested, at the
option of the Company, and approximately 614,000 shares were repurchased from
terminated employees during the year ended December 31, 1997. The shares vest
over a period of time as determined by the Board of Directors for each
individual purchase agreement, generally four years. At December 31, 1996 and
1997 and June 30, 1998, approximately 1,660,000, 1,430,000 and 1,304,000 shares,
respectively, were subject to repurchase.
 
                                      F-24
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
11. STOCK-BASED COMPENSATION (CONTINUED)
 
    The following table summarizes stock option activity:
 
<TABLE>
<CAPTION>
                                                                                                 WEIGHTED-AVERAGE
                                                                                     NUMBER OF    EXERCISE PRICE
                                                                                      SHARES         PER SHARE
                                                                                    -----------  -----------------
<S>                                                                                 <C>          <C>
ACTAMED CORPORATION
Outstanding at January 1, 1995....................................................    4,223,214      $     .34
  Granted.........................................................................      856,000            .91
  Exercised.......................................................................   (1,071,250)           .02
  Canceled........................................................................      (62,750)           .83
                                                                                    -----------
Options outstanding at December 31, 1995..........................................    3,945,214      $     .55
                                                                                    -----------
                                                                                    -----------
HEALTHEON CORPORATION
Options outstanding at December 31, 1995 (reflecting the exchange ratio of
  .6272)..........................................................................    2,474,438      $     .88
  Granted.........................................................................    3,004,384            .54
  Exercised.......................................................................         (300)           .05
  Canceled........................................................................     (233,907)           .78
                                                                                    -----------
Options outstanding at December 31, 1996..........................................    5,244,615            .68
  Granted.........................................................................    5,394,008            .73
  Exercised.......................................................................     (547,844)           .16
  Canceled........................................................................     (890,528)           .49
                                                                                    -----------
Options outstanding at December 31, 1997..........................................    9,200,251            .72
  Granted.........................................................................    1,917,806           2.76
  Exercised.......................................................................   (1,659,684)           .59
  Canceled........................................................................     (460,378)           .86
                                                                                    -----------
Options outstanding at June 30, 1998..............................................    8,997,995      $    1.17
                                                                                    -----------
                                                                                    -----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                           HEALTHEON CORPORATION
                                                                    ACTAMED      -----------------------------------------
                                                                  CORPORATION
                                                                ---------------      YEARS ENDED
                                                                  YEAR ENDED         DECEMBER 31,       SIX MONTHS ENDED
                                                                 DECEMBER 31,    --------------------       JUNE 30,
                                                                     1995          1996       1997            1998
                                                                ---------------  ---------  ---------  -------------------
<S>                                                             <C>              <C>        <C>        <C>
Weighted-average fair value of options granted................     $     .28     $     .15  $     .18       $     .50
                                                                       -----     ---------  ---------           -----
                                                                       -----     ---------  ---------           -----
</TABLE>
 
                                      F-25
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
11. STOCK-BASED COMPENSATION (CONTINUED)
    The following table summarizes information regarding options outstanding and
exercisable at June 30, 1998.
 
<TABLE>
<CAPTION>
                                                                              WEIGHTED-
                                                                               AVERAGE
                                                             WEIGHTED-        REMAINING                    WEIGHTED-
                                               NUMBER         AVERAGE        CONTRACTUAL      NUMBER        AVERAGE
EXERCISE PRICES                              OUTSTANDING  EXERCISE PRICE   LIFE (IN YEARS)  EXERCISABLE EXERCISE PRICE
- -------------------------------------------  -----------  ---------------  ---------------  ----------  ---------------
<S>                                          <C>          <C>              <C>              <C>         <C>
$.03-$.08..................................   1,682,076      $     .05             6.01        941,969     $     .04
$.20-$.25..................................   3,052,982            .24             9.04        392,025           .24
$1.00-$1.50................................   1,881,377           1.26             8.14        715,877          1.45
$2.00-$2.75................................     725,350           2.38             9.77             --            --
$3.24-$3.67................................   1,656,210           3.42             9.24        698,913          3.24
                                             -----------                                    ----------
                                              8,997,995      $    1.17             8.39      2,748,784     $    1.25
                                             -----------                                    ----------
                                             -----------                                    ----------
</TABLE>
 
    The Company recorded deferred stock compensation of approximately $2,713,000
and $2,402,000 during the year ended December 31, 1997 and the six months ended
June 30, 1998, respectively. These amounts represented the difference between
the exercise price and the deemed fair value of the Company's common stock on
the date such stock options were granted. The Company recorded amortization of
deferred stock compensation of approximately $562,000 and $1,142,000,
respectively, during these periods based on a graded vesting method. At June 30,
1998, the Company had a total of approximately $3,411,000 remaining to be
amortized on a graded vesting method over the corresponding vesting period of
each respective option, generally four years.
 
    PRO FORMA INFORMATION
 
    The Company has elected to follow APB No. 25 and related interpretations in
accounting for its employee stock options because, as discussed below, the
alternative fair value accounting provided for under SFAS No. 123 requires use
of option valuation models that were not developed for use in valuing employee
stock options. Under APB No. 25, no compensation expense is recognized when the
exercise price of stock options granted to the Company's employees equals the
market price of the underlying stock on the date of grant.
 
    Pro forma information regarding net loss is required by SFAS No. 123 and has
been determined as if its employee stock options granted subsequent to December
31, 1994 were accounted for under the fair value method of SFAS No. 123. The
fair value for these options was estimated at the date of grant using the
minimum value method with the following weighted-average assumptions for the
years ended December 31, 1995, 1996 and 1997 and the six months ended June 30,
1998: risk-free interest rate of
 
                                      F-26
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
11. STOCK-BASED COMPENSATION (CONTINUED)
approximately 6.2%, 6.0%, 6.0% and 5.5%, respectively; a weighted-average
expected life of the option of 5.0 years, 4.3 years, 4.2 years and 3.6 years,
respectively, and a dividend yield of zero for all periods.
 
   
<TABLE>
<CAPTION>
                                                                                   HEALTHEON CORPORATION
                                                             ACTAMED      ---------------------------------------
                                                           CORPORATION
                                                          --------------         YEARS ENDED
                                                            YEAR ENDED           DECEMBER 31,         SIX MONTHS
                                                           DECEMBER 31,   --------------------------  ENDED JUNE
                                                               1995           1996          1997       30, 1998
                                                          --------------  ------------  ------------  -----------
                                                                          (RESTATED -- SEE NOTE 14)
<S>                                                       <C>             <C>           <C>           <C>
Net loss applicable to common stockholders (in
  thousands):
  As reported...........................................    $   (4,458)    $  (18,606)   $  (28,005)   $ (22,331)
                                                               -------    ------------  ------------  -----------
                                                               -------    ------------  ------------  -----------
  Pro forma.............................................    $   (4,488)    $  (18,695)   $  (28,173)   $ (23,144)
                                                               -------    ------------  ------------  -----------
                                                               -------    ------------  ------------  -----------
Basic and diluted net loss per common share:
  As reported...........................................    $     (.85)    $    (2.83)   $    (3.88)   $   (1.27)
                                                               -------    ------------  ------------  -----------
                                                               -------    ------------  ------------  -----------
  Pro forma.............................................    $     (.86)    $    (2.84)   $    (3.90)   $   (1.31)
                                                               -------    ------------  ------------  -----------
                                                               -------    ------------  ------------  -----------
</TABLE>
    
 
12. INCOME TAXES
 
    Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Significant components of
the Company's deferred tax assets (liabilities) were as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                                  DECEMBER 31,
                                                                           --------------------------   JUNE 30,
                                                                               1996          1997         1998
                                                                           ------------  ------------  -----------
                                                                           (RESTATED -- SEE NOTE 14)
<S>                                                                        <C>           <C>           <C>
Deferred tax assets:
  Net operating loss carryforwards.......................................   $    7,537    $   14,263    $  18,878
  Intangible assets......................................................        1,580         3,688        5,448
  Research and development tax credit....................................          561         1,014        1,383
  Reserves and accruals not currently deductible.........................          227           308        1,177
                                                                           ------------  ------------  -----------
Total deferred tax assets................................................        9,905        19,273       26,886
Valuation allowance......................................................       (9,545)      (18,931)     (26,841)
                                                                           ------------  ------------  -----------
Net deferred tax assets..................................................          360           342           45
                                                                           ------------  ------------  -----------
Deferred tax liabilities:
  Depreciation...........................................................          (31)          (45)         (45)
  Capitalized software development costs.................................         (329)         (297)          --
                                                                           ------------  ------------  -----------
Total deferred tax liabilities...........................................         (360)         (342)         (45)
                                                                           ------------  ------------  -----------
Net deferred tax assets and liabilities..................................   $       --    $       --    $      --
                                                                           ------------  ------------  -----------
                                                                           ------------  ------------  -----------
</TABLE>
 
                                      F-27
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
12. INCOME TAXES (CONTINUED)
    A valuation allowance equal to 100% of the net deferred tax assets has been
established because of the uncertainty of realization of the deferred tax assets
due to the Company's lack of earnings history. The valuation allowance for
deferred tax assets increased by $6,580,000, $9,386,000 and $7,910,000 during
the years ended December 31, 1996 and 1997 and the six months ended June 30,
1998, respectively.
 
    At June 30, 1998, the Company had net operating loss carryforwards for
federal income tax purposes of approximately $49,800,000, which expire in 2009
through 2013, and federal tax credits of approximately $1,000,000, which expire
in 2009 through 2013.
 
    Approximately $19,545,000 of the net operating loss at June 30, 1998 related
to a consolidated subsidiary. This loss carryforward is only available to offset
future taxable income of that subsidiary.
 
    Because of the "change of ownership" provisions of the Internal Revenue
Code, a portion of the Company's net operating loss carryforwards and tax credit
carryforwards may be subject to an annual limitation regarding their utilization
against taxable income in future periods. A portion of these carryforwards may
expire before becoming available to reduce future income tax liabilities.
 
13. RELATED PARTY TRANSACTIONS
 
    The Company has two customers that are significant stockholders of the
Company.
 
    The Company entered into a Development Agreement with a partnership
controlled by the former Chairman of the Board of Directors of ActaMed. Pursuant
to this agreement, the Company granted the partnership exclusive licenses to use
ActaMed's technology for industries other than the health care industry. Under
the agreement, the Company will receive a commercial royalty on the
partnership's gross receipts. If the Company desires in the future to expand to
other industries, the partnership must either develop that industry in a defined
time period or rights to that industry revert to the Company. The agreement
expires December 3, 1998 and to date no fees have been paid to the Company
thereunder.
 
    The Company shares office space and provides administrative support and
network resources to a company controlled by a member of the Board of Directors.
Amounts reimbursed for the shared facilities and administrative support totaled
approximately $45,000, $28,000, $59,000, $27,000 and $32,000 for the years ended
December 31, 1995, 1996, and 1997 and the six months ended June 30, 1997 and
1998, respectively. Approximately $211,000, $187,000, $78,000 and $27,000 was
reimbursed during the years ended December 31, 1995, 1996 and 1997 and the six
months ended June 30, 1997, respectively, for the use of the network maintained
by the Company. No income for the use of the network by the related party was
recognized for the six months ended June 30, 1998. All such amounts are included
as an offset to general and administrative expenses in the accompanying
consolidated statements of operations. Amounts due from the related party of
$33,000 and $72,000 at December 31, 1996 and 1997, respectively, were included
in other current assets in the accompanying consolidated balance sheets. There
were no amounts due from the related party at June 30, 1998.
 
14. RESTATEMENT OF FINANCIAL STATEMENTS
 
   
    Subsequent to the issuance of the financial statements for 1996 and 1997,
the Company changed the allocation of the purchase price associated with the
acquisition of the EDI technology to decrease the
    
 
                                      F-28
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
14. RESTATEMENT OF FINANCIAL STATEMENTS (CONTINUED)
amount previously expensed as in process research and development costs and
increase the amount capitalized as software technology rights.
 
   
    The effect of this reallocation on previously reported consolidated
financial statements as of December 31, 1996 and 1997 and June 30, 1997 and for
the two years ended 1997 and the six months ended June 30, 1997 follows:
    
 
<TABLE>
<CAPTION>
                                                                                                    SIX MONTHS ENDED JUNE
                                                            YEARS ENDED DECEMBER 31,                         30,
                                               --------------------------------------------------  ------------------------
                                                                                                             1997
                                                         1996                      1997                  (UNAUDITED)
                                               ------------------------  ------------------------  ------------------------
                                               AS REPORTED   RESTATED    AS REPORTED   RESTATED    AS REPORTED   RESTATED
                                               -----------  -----------  -----------  -----------  -----------  -----------
                                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                            <C>          <C>          <C>          <C>          <C>          <C>
Cost of services.............................   $   1,487    $   1,648    $   3,792    $   4,011    $     518    $     598
Cost of services to related parties..........   $   3,776    $   4,919    $   5,016    $   6,536    $   2,339    $   3,129
Writeoff of acquired in process research and
  development costs..........................   $   5,215    $      --    $      --    $      --    $      --    $      --
Net loss applicable to common stockholders...   $ (22,517)   $ (18,606)   $ (26,266)   $ (28,005)   $ (13,307)   $ (14,177)
Basic and diluted net loss per
  common share...............................   $   (3.42)   $   (2.83)   $   (3.64)   $   (3.88)   $   (1.85)   $   (1.97)
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                             DECEMBER 31,
                                                                          --------------------------------------------------
                                                                                    1996                      1997
                                                                          ------------------------  ------------------------
                                                                          AS REPORTED   RESTATED    AS REPORTED   RESTATED
                                                                          -----------  -----------  -----------  -----------
<S>                                                                       <C>          <C>          <C>          <C>
Intangible assets.......................................................   $  12,644    $  16,555    $  16,596    $  18,768
Accumulated deficit.....................................................   $ (31,595)   $ (27,684)   $ (57,861)   $ (55,689)
</TABLE>
 
15. ACQUISITION OF METIS, LLC (UNAUDITED)
 
    On August 25, 1998, the Company acquired Metis, LLC ("Metis"), a provider of
Internet/intranet strategic consulting, design and development of Internet-based
applications and content for the healthcare industry enabling clinical
integration and managed care process improvement. The acquisition will be
accounted for using the purchase method of accounting and, accordingly, the
purchase price will be allocated to the tangible and intangible assets acquired
and the liabilities assumed on the basis of their respective fair values on the
acquisition date.
 
   
    The Company issued 1,600,000 shares of its common stock with a fair market
value of $12.8 million. Of these shares, 476,548 shares will be issued to
employees pursuant to restricted stock purchase agreements subject to a lapsing
right of repurchase, at the option of the Company, over the respective vesting
periods. In addition, the Company made a cash payment of approximately $.6
million, assumed liabilities of approximately $.3 million and incurred other
estimated acquisition related expenses, consisting primarily of legal and other
professional fees, of approximately $.1 million. The total purchase price is
estimated to be approximately $13.8 million. The Company is currently
determining the fair values of the assets acquired and the liabilities assumed,
including the fair values of any identifiable intangible assets acquired.
    
 
                                      F-29
<PAGE>
                             HEALTHEON CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                     (INFORMATION FOR THE SIX MONTHS ENDED
                          JUNE 30, 1997 IS UNAUDITED)
 
16. SUBSEQUENT EVENTS (UNAUDITED)
 
    In July and September 1998, the Company granted to employees options to
purchase common stock and issued shares of common stock pursuant to restricted
stock agreements equal to a total of 3,433,500 shares of the Company's common
stock at exercise prices ranging from $4.50 to $8.00 per share. The Company
estimates that it will record deferred stock compensation of approximately
$6,000,000 with regard to these grants.
 
    In July 1998, the Board of Directors approved a resolution authorizing the
Company to issue up to 5,000,000 shares of preferred stock. To date, no
preferred shares have been issued. Also, in July 1998, the Board of Directors
approved a 5,000,000 increase in the common shares reserved for issuance under
the Company's 1996 Stock Plan.
 
   
    In September 1998, the Board of Directors approved and in October 1998, the
stockholders also approved the adoption of the Company's 1998 Employee Stock
Purchase Plan (the "1998 Purchase Plan"). A total of 1,000,000 shares of common
stock has been reserved for issuance under the 1998 Purchase Plan, plus annual
increases equal to the lesser of 500,000 shares, 0.5% of the outstanding common
shares on such date or a lesser amount determined by the Board of Directors.
    
 
                                      F-30
<PAGE>
INDEPENDENT AUDITORS' REPORT
 
Board of Directors of United HealthCare Corporation:
 
    We have audited the accompanying statements of divisional net loss and
United HealthCare Corporation's ("United's") net investment and of divisional
cash flows for the year ended December 31, 1995 of EDI Services Group ("EDI") (a
Division of United.) These statements of divisional net loss and United's net
investment and of divisional cash flows are the responsibility of United's
management. Our responsibility is to express an opinion on these statements of
divisional net loss and United's net investment and of divisional cash flows
based on our audit.
 
    We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the statements of divisional net loss and
United's net investment and of divisional cash flows are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the statements of divisional net loss and
United's net investment and of divisional cash flows. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall statements of divisional net loss
and United's net investment and of divisional cash flows presentation. We
believe that our audit provides a reasonable basis for our opinion.
 
    The accompanying statements of divisional net loss and United's net
investment and of divisional cash flows reflect a component of a business
enterprise that was derived from a consolidated group of companies rather than a
complete legal entity. See Note 1 to the statements of divisional net loss and
United's net investment and of divisional cash flows for a description of the
basis of presentation.
 
    In our opinion, the statements of divisional net loss and United's net
investment and of divisional cash flows present fairly, in all material
respects, the results of its divisional net loss and United's net investment and
of divisional cash flows for the year ended December 31, 1995, in conformity
with generally accepted accounting principles.
 
DELOITTE & TOUCHE LLP
 
Minneapolis, Minnesota
April 4, 1996
 
                                      F-31
<PAGE>
                               EDI SERVICES GROUP
                 (A DIVISION OF UNITED HEALTHCARE CORPORATION)
 
          STATEMENT OF DIVISIONAL NET LOSS AND UNITED'S NET INVESTMENT
                          YEAR ENDED DECEMBER 31, 1995
 
<TABLE>
<S>                                                                   <C>
Revenue:
  Related-party processing revenue..................................  $2,900,448
  Related-party site revenue........................................   1,155,300
  Other processing revenue..........................................     100,013
                                                                      ----------
    Total revenue...................................................   4,155,761
 
Operating costs and expenses:
  Cost of revenues..................................................   1,646,039
  Sales and marketing...............................................     302,145
  Research and development..........................................   1,604,897
  General and administrative........................................     642,980
                                                                      ----------
    Total operating costs and expenses..............................   4,196,061
                                                                      ----------
 
Loss before income taxes............................................     (40,300)
 
Income taxes........................................................      48,177
                                                                      ----------
    Net loss........................................................     (88,477)
 
United's net investment -- Beginning of period......................     124,393
 
Net cash flows to EDI division......................................     417,213
                                                                      ----------
United's net investment -- end of period............................  $  453,129
                                                                      ----------
                                                                      ----------
</TABLE>
 
                       See notes to financial statements.
 
                                      F-32
<PAGE>
                               EDI SERVICES GROUP
                 (A DIVISION OF UNITED HEALTHCARE CORPORATION)
 
                       STATEMENT OF DIVISIONAL CASH FLOWS
                          YEAR ENDED DECEMBER 31, 1995
 
<TABLE>
<S>                                                                                <C>
Operating activities:
  Net loss.......................................................................  $ (88,477)
  Adjustments to reconcile net loss to net cash
    provided by operating activities:
    Depreciation and amortization................................................    285,613
    Increase in deferred income taxes............................................     48,177
    Changes in assets and liabilities:
      Accounts receivable........................................................    (13,347)
      Accounts payable...........................................................    (58,612)
      Accrued expenses...........................................................    (46,083)
                                                                                   ---------
        Net cash provided by operating activities................................    127,271
 
Investing activities:
  Purchase of property...........................................................   (190,375)
  Software development costs.....................................................   (354,109)
                                                                                   ---------
        Net cash used in investing activities....................................   (544,484)
                                                                                   ---------
Net cash flows of division which were provided by United.........................  $(417,213)
                                                                                   ---------
                                                                                   ---------
</TABLE>
 
                       See notes to financial statements.
 
                                      F-33
<PAGE>
                               EDI SERVICES GROUP
                 (A DIVISION OF UNITED HEALTHCARE CORPORATION)
 
                         NOTES TO FINANCIAL STATEMENTS
                      FOR THE YEAR ENDED DECEMBER 31, 1995
 
1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    NATURE OF BUSINESS -- EDI Services Group ("EDI") is an operating division of
United HealthCare Corporation ("United"). EDI was established to develop and
market software to control a network that facilitates the exchange of health
care information among managed care organizations, insurance carriers,
hospitals, physicians, and other health care industry participants. On December
15, 1995, United transferred EDI and its ProviderLink operations to a holding
company, UHC Green Acquisition Inc. ("UHC Green") (a wholly owned subsidiary of
United).
 
    BASIS OF PRESENTATION -- The accompanying statements of divisional net loss
and United's net investment and divisional cash flows have been prepared from
the books and records maintained by EDI and United. The statement of divisional
net loss may not necessarily be indicative of the results of operations that
would have been obtained if EDI had been operated as an independent entity. The
statement of divisional net loss includes allocation of certain expenses that
are material in amount. Such expenses are allocations for corporate services and
overhead.
 
    Intercompany revenue results from network services provided to health plans
owned or managed by United.
 
    The accompanying financial statements have been prepared on a going-concern
basis, which contemplates the realization of assets and liabilities in the
normal course of business. As shown in the financial statements, during the year
ended December 31, 1995, EDI incurred a net loss of approximately $88,000 and a
cash flow deficit of approximately $417,000.
 
    As discussed in Note 5, EDI was acquired by ActaMed Corporation ("ActaMed")
effective March 31, 1996. EDI's continued existence is dependent on funding of
its cash flow deficit by ActaMed and on its relationship and service agreement
with United. The service agreement states that the combined entities will be the
primary provider of electronic data interchange services for United for a period
of five years.
 
    The nature of EDI's operations exposes EDI to certain business risks. Such
business risks include EDI's concentration of sales transactions with United,
which accounted for 98% of EDI's 1995 revenues (see Note 4). The market for
health care information services is highly competitive and subject to rapid
technological change, evolving industry standards, and regulatory developments
and influences that may affect both the operations of EDI and its customers. In
addition, significant demands may be placed on EDI's management as a result of
EDI's merger with ActaMed (see Note 5). Other significant business risks faced
by EDI include a dependence on key employees and the risk of liability
associated with unforeseen software product errors.
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
SIGNIFICANT ACCOUNTING POLICIES
 
    INCOME TAXES -- United provides for income taxes under the provisions of
SFAS No. 109, "Accounting for Income Taxes," which requires deferred income tax
balances to be computed annually for differences between financial statement and
tax bases of assets and liabilities based on enacted tax rates. An income tax
provision has been allocated to EDI as if EDI filed on a separate return basis;
however, under the
 
                                      F-34
<PAGE>
                               EDI SERVICES GROUP
                 (A DIVISION OF UNITED HEALTHCARE CORPORATION)
 
                         NOTES TO FINANCIAL STATEMENTS
                FOR THE YEAR ENDED DECEMBER 31, 1995 (CONTINUED)
 
1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
income tax allocation agreement policy with United, no benefit is allocated for
losses incurred which are utilized in the consolidated income tax return (see
Note 2).
 
    UNITED'S NET INVESTMENT -- United's net investment, as shown in the
accompanying statement of divisional net loss and United's net investment,
represents losses incurred by EDI since inception and the intercompany account
with United that consists of transactions with United and the net cash flows of
EDI, which have been funded by United.
 
    REVENUE RECOGNITION -- EDI earns revenue from providing access to its
network services, including fixed fee and transaction-based services. EDI
recognizes revenue from network services over the period the services are
provided.
 
2.  INCOME TAXES
 
    Components of income tax expense for the year ended December 31, 1995 were:
 
<TABLE>
<CAPTION>
<S>                                                                        <C>
Deferred:
  State..................................................................  $11,666
  Federal................................................................   36,511
                                                                           -------
                                                                           $48,177
                                                                           -------
                                                                           -------
</TABLE>
 
    Differences between the provision for income taxes at the federal statutory
rate and the recorded provision for the year ended December 31, 1995 are
summarized as follows:
 
<TABLE>
<S>                                                                       <C>
Benefit at statutory rate...............................................   $ (13,610)
State income taxes......................................................      (2,590)
Net operating loss carryforward for which no benefit could be recognized
  under United's tax allocation policy..................................      60,368
Other...................................................................       4,009
                                                                          -----------
                                                                           $  48,177
                                                                          -----------
                                                                          -----------
</TABLE>
 
    As of December 31, 1995, EDI had no federal and state tax loss
carryforwards. Under a tax sharing agreement, tax loss carryforwards are not
available to EDI because United has already realized these tax benefits in its
prior years, consolidated federal and state returns.
 
3.  EMPLOYEE STOCK OWNERSHIP PLAN
 
    EDI employees participate in United's unleveraged Employee Stock Ownership
Plan ("ESOP") maintained for the benefit of all eligible employees. United
contributions are made at the discretion of the Board of Directors.
Contributions totaling $3,700 for the year ended December 31, 1995, have been
made to the ESOP for EDI employees.
 
                                      F-35
<PAGE>
                               EDI SERVICES GROUP
                 (A DIVISION OF UNITED HEALTHCARE CORPORATION)
 
                         NOTES TO FINANCIAL STATEMENTS
                FOR THE YEAR ENDED DECEMBER 31, 1995 (CONTINUED)
 
4.  RELATED PARTIES
 
    Revenue from processing transactions and site licensing for United and its
affiliates comprises approximately 98% of total revenue for the year ended
December 31, 1995, and was approximately $4,056,000 for the year then ended.
 
    EDI utilizes various common corporate systems and support maintained by
United. The related costs are charged to EDI based on specific allocation
methods, if applicable, and are based on employee headcount. These functions
include human resources, accounting, legal, other processing and administrative
services, and building rent. The total amounts allocated to EDI were
approximately $438,000 for the year ended December 31, 1995. United's management
believes that these allocations are reasonable; however, these allocations would
not necessarily represent the amounts that would have been incurred on a
separate company basis.
 
5.  SUBSEQUENT EVENTS
 
    On March 1, 1996, United and UHC Green (renamed "EDI Services, Inc.")
entered into an agreement with ActaMed and EDI Acquisition, Inc. (a
subcorporation of ActaMed). This agreement allows for the acquisition of EDI
Services, Inc. by ActaMed pursuant to the merger of EDI Acquisition, Inc. with
and into EDI Services, Inc. effective March 31, 1996. The outstanding shares of
capital stock of EDI Services, Inc. were converted into 10,344,828 shares of
ActaMed's Series C Convertible Redeemable Preferred Stock.
 
                                      F-36
<PAGE>
                                     [LOGO]
<PAGE>
                 [ALTERNATE PAGE FOR INTERNATIONAL PROSPECTUS]
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY JURISDICTION IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL
PRIOR TO THE REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH
JURISDICTION.
<PAGE>
                 [ALTERNATE PAGE FOR INTERNATIONAL PROSPECTUS]
 
PROSPECTUS (SUBJECT TO COMPLETION)
 
ISSUED OCTOBER 16, 1998
 
                                7,287,500 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
                               -----------------
 
OF THE 7,287,500 SHARES OF COMMON STOCK OFFERED HEREBY, 1,457,500 SHARES ARE
BEING OFFERED INITIALLY OUTSIDE OF THE UNITED STATES AND CANADA BY THE
 INTERNATIONAL UNDERWRITERS AND 5,830,000 SHARES ARE BEING OFFERED INITIALLY IN
 THE UNITED STATES AND CANADA BY THE U.S. UNDERWRITERS. ALL OF THE SHARES OF
  COMMON STOCK BEING OFFERED HEREBY ARE BEING SOLD BY THE COMPANY. THE COMPANY
  HAS REQUESTED THAT THE U.S. UNDERWRITERS RESERVE UP TO 1,088,500 SHARES OF
   COMMON STOCK FROM THE UNDERWRITTEN OFFERING TO BE OFFERED AT THE PUBLIC
     OFFERING PRICE TO CERTAIN PERSONS DESIGNATED BY THE COMPANY. SEE
     "UNDERWRITERS." IN ADDITION, AN ENTITY CONTROLLED BY JAMES H. CLARK,
     THE COMPANY'S CHAIRMAN OF THE BOARD OF DIRECTORS, HAS INDICATED THAT
     IT WILL PURCHASE DIRECTLY FROM THE COMPANY AN AGGREGATE OF 2,451,786
      SHARES AT THE INITIAL PUBLIC OFFERING PRICE CONCURRENTLY WITH THE
       CLOSING OF THIS OFFERING. PRIOR TO THIS OFFERING, THERE HAS BEEN
       NO PUBLIC MARKET FOR THE COMMON STOCK OF THE COMPANY. IT IS
        CURRENTLY ESTIMATED THAT THE INITIAL PUBLIC OFFERING PRICE WILL
        BE BETWEEN $6.00 AND $8.00 PER SHARE. SEE "UNDERWRITERS" FOR A
        DISCUSSION OF THE FACTORS TO BE CONSIDERED IN DETERMINING THE
        INITIAL PUBLIC OFFERING PRICE. THE SHARES OF COMMON STOCK HAVE
         BEEN APPROVED FOR QUOTATION ON THE NASDAQ NATIONAL MARKET
          UNDER THE SYMBOL "HLTH" SUBJECT TO OFFICIAL NOTICE OF
          ISSUANCE.
 
                            ------------------------
 
        THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS"
                          COMMENCING ON PAGE 4 HEREOF.
                               -----------------
 
   THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
       SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
       COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
         PROSPECTUS. ANY
           REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                             ---------------------
 
                                PRICE $  A SHARE
                              -------------------
 
<TABLE>
<CAPTION>
                                                                           UNDERWRITING
                                                     PRICE TO              DISCOUNTS AND             PROCEEDS TO
                                                      PUBLIC              COMMISSIONS(1)             COMPANY(2)
                                               ---------------------  -----------------------  -----------------------
<S>                                            <C>                    <C>                      <C>
PER SHARE....................................            $                       $                        $
TOTAL (3)....................................            $                       $                        $
</TABLE>
 
- -------------
    (1) THE COMPANY HAS AGREED TO INDEMNIFY THE UNDERWRITERS AGAINST CERTAIN
        LIABILITIES, INCLUDING LIABILITIES UNDER THE SECURITIES ACT OF 1933, AS
        AMENDED. SEE "UNDERWRITERS."
    (2) BEFORE DEDUCTING EXPENSES PAYABLE BY THE COMPANY ESTIMATED AT
        $1,700,000.
    (3) THE COMPANY HAS GRANTED THE U.S. UNDERWRITERS AN OPTION, EXERCISABLE
        WITHIN 30 DAYS OF THE DATE HEREOF, TO PURCHASE UP TO AN AGGREGATE OF
        978,750 ADDITIONAL SHARES AT THE PRICE TO PUBLIC, LESS UNDERWRITING
        DISCOUNTS AND COMMISSIONS FOR THE PURPOSE OF COVERING OVER-ALLOTMENTS,
        IF ANY. IF THE U.S. UNDERWRITERS EXERCISE SUCH OPTION IN FULL, THE TOTAL
        PRICE TO PUBLIC, UNDERWRITING DISCOUNTS AND COMMISSIONS AND PROCEEDS TO
        COMPANY WILL BE $     , $     AND $     , RESPECTIVELY. SEE
        "UNDERWRITERS."
 
                          ---------------------------
 
    THE SHARES ARE OFFERED, SUBJECT TO PRIOR SALE, WHEN, AS AND IF ACCEPTED BY
THE UNDERWRITERS NAMED HEREIN AND SUBJECT TO APPROVAL OF CERTAIN LEGAL MATTERS
BY FENWICK & WEST LLP, COUNSEL FOR THE UNDERWRITERS. IT IS EXPECTED THAT
DELIVERY OF THE SHARES WILL BE MADE ON OR ABOUT       , 1998 AT THE OFFICE OF
MORGAN STANLEY & CO. INCORPORATED, NEW YORK, N.Y., AGAINST PAYMENT THEREFOR IN
IMMEDIATELY AVAILABLE FUNDS.
 
                              -------------------
 
            MORGAN STANLEY DEAN WITTER  GOLDMAN SACHS INTERNATIONAL
 
HAMBRECHT & QUIST                                   VOLPE BROWN WHELAN & COMPANY
 
        , 1998
<PAGE>
                [ALTERNATE PAGE FOR NON-UNDERWRITTEN PROSPECTUS]
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY JURISDICTION IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL
PRIOR TO THE REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH
JURISDICTION.
<PAGE>
                [ALTERNATE PAGE FOR NON-UNDERWRITTEN PROSPECTUS]
 
PROSPECTUS (SUBJECT TO COMPLETION)
 
ISSUED OCTOBER 16, 1998
 
                                2,451,786 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
 
                               -----------------
 
 THIS PROSPECTUS RELATES TO 2,451,786 SHARES OF COMMON STOCK TO BE OFFERED AT A
 PRICE OF $        PER SHARE TO MONACO PARTNERS, LP (THE "RELATED SALE"). SEE
  "PLAN OF DISTRIBUTION." THE PRICE PER SHARE OF THE SHARES OFFERED HEREBY
      WILL BE THE SAME AS THE PRICE PER SHARE OF THE SHARES OFFERED IN A
        RELATED UNDERWRITTEN PUBLIC OFFERING OF 7,287,500 SHARES. THE
           SHARES OF COMMON STOCK HAVE BEEN APPROVED FOR QUOTATION ON
             THE NASDAQ NATIONAL MARKET UNDER THE SYMBOL "HLTH"
                   SUBJECT TO OFFICIAL NOTICE OF ISSUANCE.
 
                              -------------------
 
 THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS" COMMENCING ON
                                 PAGE 4 HEREOF.
 
                               -----------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
     EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
        SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
             COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF
                THIS PROSPECTUS. ANY REPRESENTATION TO THE
                      CONTRARY IS A CRIMINAL OFFENSE.
 
           , 1998
<PAGE>
                [ALTERNATE PAGE FOR NON-UNDERWRITTEN PROSPECTUS]
 
    NO PERSON IS AUTHORIZED IN CONNECTION WITH ANY OFFERING MADE HEREBY TO GIVE
ANY INFORMATION OR TO MAKE ANY REPRESENTATION OTHER THAN AS CONTAINED IN THIS
PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR BY ANY UNDERWRITER.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN
OFFER TO BUY ANY SECURITIES OTHER THAN THE REGISTERED SECURITIES TO WHICH IT
RELATES OR AN OFFER TO, OR A SOLICITATION OF, ANY PERSON IN ANY JURISDICTION
WHERE SUCH AN OFFER OR SOLICITATION WOULD BE UNLAWFUL. NEITHER THE DELIVERY OF
THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES,
CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE
COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED HEREIN IS
CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.
                              -------------------
 
    UNTIL            , 1998 (25 DAYS AFTER THE DATE OF THIS PROSPECTUS), ALL
DEALERS EFFECTING TRANSACTIONS IN THE REGISTERED SECURITIES, WHETHER OR NOT
PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS.
THIS DELIVERY REQUIREMENT IS IN ADDITION TO THE OBLIGATIONS OF DEALERS TO
DELIVER A PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR
UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
                              -------------------
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                    PAGE
                                    ----
<S>                                 <C>
Prospectus Summary................     3
Risk Factors......................     4
The Company.......................    17
Use of Proceeds...................    18
Dividend Policy...................    18
Capitalization....................    19
Dilution..........................    20
Selected Consolidated Financial
  Data............................    21
Management's Discussion and
  Analysis of Financial Condition
  and Results of Operations.......    23
Business..........................    34
 
<CAPTION>
                                    PAGE
                                    ----
<S>                                 <C>
Management........................    48
Certain Transactions..............    61
Principal Stockholders............    65
Description of Capital Stock......    68
Shares Eligible for Future Sale...    71
Certain United States Tax
  Consequences to Non-U.S. Holders
  of Common Stock.................    73
Plan of Distribution..............    75
Legal Matters.....................    75
Experts...........................    75
Additional Information............    76
Index to Consolidated Financial
  Statements......................   F-1
</TABLE>
 
                              -------------------
 
    The Company intends to furnish its stockholders with annual reports
containing consolidated financial statements audited by an independent public
accounting firm and quarterly reports containing unaudited consolidated
financial data for the first three quarters of each year.
                              -------------------
 
    The Company's executive offices are located at 4600 Patrick Henry Drive,
Santa Clara, California 95054. Its telephone number at this location is
408-876-5000.
                              -------------------
 
    Healtheon, Healtheon's logo, Virtual Healthcare Network, VHN and
ProviderLink are trademarks of the Company. SBCL SCAN is a trademark of
SmithKline Beecham Clinical Laboratories, Inc., and each other trademark, trade
name or service mark of any other company appearing in this Prospectus is the
property of its holder.
                              -------------------
 
    UNLESS OTHERWISE INDICATED, THE INFORMATION IN THIS PROSPECTUS (i) ASSUMES
NO EXERCISE OF THE U.S. UNDERWRITERS' OVER-ALLOTMENT OPTION, (ii) GIVES EFFECT
TO THE FILING, PRIOR TO THE CLOSING OF THIS OFFERING, OF A CERTIFICATE OF
INCORPORATION AUTHORIZING 150,000,000 SHARES OF COMMON STOCK AND 5,000,000
SHARES OF UNDESIGNATED PREFERRED STOCK AND (iii) GIVES EFFECT TO A 5,000,000
SHARE INCREASE IN THE NUMBER OF SHARES RESERVED UNDER THE COMPANY'S 1996 STOCK
PLAN (THE "1996 PLAN"). IN THIS PROSPECTUS, UNLESS THE CONTEXT OTHERWISE
INDICATES, REFERENCES TO "HEALTHEON" OR THE "COMPANY" ARE TO HEALTHEON
CORPORATION, A DELAWARE CORPORATION, AND ITS CONSOLIDATED SUBSIDIARIES.
                              -------------------
 
    CERTAIN PERSONS PARTICIPATING IN THE UNDERWRITTEN OFFERING MAY ENGAGE IN
TRANSACTIONS THAT STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE
COMMON STOCK. SPECIFICALLY, THE UNDERWRITERS MAY OVER-ALLOT IN CONNECTION WITH
THE OFFERING AND MAY BID FOR, AND PURCHASE, SHARES OF COMMON STOCK IN THE OPEN
MARKET.
<PAGE>
                [ALTERNATE PAGE FOR NON-UNDERWRITTEN PROSPECTUS]
 
                              PLAN OF DISTRIBUTION
 
    This Prospectus relates to 2,451,786 shares of Common Stock to be offered to
Monaco Partners, LP. Prior to this offering, there has been no public market for
the Common Stock. The initial public offering price will be determined by
negotiations between the Company and Morgan Stanley & Co. Incorporated, Goldman,
Sachs & Co., Hambrecht & Quist LLC and Volpe Brown Whelan & Company, LLC. Among
the factors to be considered in determining the initial public offering price
will be the future prospects of the Company and its industry in general, sales,
earnings and certain other financial and operating information of the Company in
recent periods, and the price-earnings ratios, price-sales ratios, market prices
of securities and certain financial and operating information of companies
engaged in activities similar to those of the Company. The estimated initial
public offering price range set forth on the cover page of this Preliminary
Prospectus is subject to change as a result of market conditions and other
factors.
 
                                 LEGAL MATTERS
 
    The validity of the issuance of the shares of Common Stock offered hereby
will be passed upon for the Company by Wilson Sonsini Goodrich & Rosati,
Professional Corporation, Palo Alto, California. Certain legal matters in
connection with this offering will be passed upon for the Underwriters by
Fenwick & West LLP, Palo Alto, California.
 
                                    EXPERTS
 
    Healtheon was incorporated in December 1995 and did not commence operations
until January 1996. Thus, the financial statements of ActaMed for the year ended
December 31, 1995 also represent the financial statements of Healtheon on a
pooled basis for that period.
 
    The consolidated financial statements of Healtheon Corporation at December
31, 1996 and 1997 and June 30, 1998, and for the two years in the period ended
December 31, 1997 and for the six month period ended June 30, 1998, appearing in
this Prospectus and Registration Statement have been audited by Ernst & Young
LLP, independent auditors, as set forth in their report thereon appearing
elsewhere herein which, as to the year ended December 31, 1996, is based in part
on the report of Deloitte & Touche LLP, independent auditors. The consolidated
financial statements referred to above are included in reliance upon such report
given upon the authority of such firm as experts in accounting and auditing.
 
    The consolidated financial statements of ActaMed Corporation for the year
ended December 31, 1995, included in this Prospectus and Registration Statement
have been audited by Deloitte & Touche LLP, independent auditors, as stated in
their report appearing herein. The consolidated financial statements of ActaMed
Corporation as of December 31, 1996 and for the year then ended, (not separately
presented in this Prospectus and Registration Statement) have been audited by
Deloitte & Touche LLP, independent auditors, as stated in their report appearing
herein, (which expresses an unqualified opinion and includes an explanatory
paragraph relating to the restatement of ActaMed Corporation 1996 financial
statements as described in Note 14). Such financial statements are included in
reliance upon the report of such firm given upon their authority as experts in
accounting and auditing.
 
    The statements of divisional net loss and United HealthCare Corporation's
net investment and of divisional cash flows of EDI Services Group (a division of
United HealthCare Corporation) included in this Prospectus and Registration
Statement have been audited by Deloitte and Touche LLP, independent auditors, as
stated in their report appearing herein, and are included in reliance upon the
report of such firm given upon their authority as experts in accounting and
auditing.
 
                                       75
<PAGE>
                [ALTERNATE PAGE FOR NON-UNDERWRITTEN PROSPECTUS]
 
                             ADDITIONAL INFORMATION
 
    The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-1 under the Securities Act, and
the rules and regulations promulgated thereunder, with respect to the Common
Stock offered hereby. This Prospectus, which constitutes a part of the
Registration Statement, does not contain all of the information set forth in the
Registration Statement and the exhibits thereto. Statements contained in this
Prospectus as to the contents of any contract or other document that is filed as
an exhibit to the Registration Statement are not necessarily complete and each
such statement is qualified in all respects by reference to the full text of
such contract or document. For further information with respect to the Company
and the Common Stock, reference is hereby made to the Registration Statement and
the exhibits thereto, which may be inspected and copied at the principal office
of the Commission, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the
regional offices of the Commission located at Seven World Trade Center, Suite
1300, New York, New York 10048 and Citicorp Center, 500 West Madison Street,
Suite 1400, Chicago, Illinois 60661, and copies of all or any part thereof may
be obtained at prescribed rates from the Commission's Public Reference Section
at such addresses. Also, the Commission maintains a World Wide Web site on the
Internet at http://www.sec.gov that contains reports, proxy and information
statements and other information regarding registrants that file electronically
with the Commission.
 
    Upon completion of the offering, the Company will become subject to the
information and periodic reporting requirements of the Exchange Act and, in
accordance therewith, will file periodic reports, proxy and information
statements and other information with the Commission. Such periodic reports,
proxy and information statements and other information will be available for
inspection and copying at the regional offices, public reference facilities and
Web site of the Commission referred to above.
 
                                       76
<PAGE>
                [ALTERNATE PAGE FOR NON-UNDERWRITTEN PROSPECTUS]
 
                     (This page intentionally left blank.)
 
                                       77
<PAGE>
                [ALTERNATE PAGE FOR NON-UNDERWRITTEN PROSPECTUS]
 
                     (This page intentionally left blank.)
 
                                       78
<PAGE>
                [ALTERNATE PAGE FOR NON-UNDERWRITTEN PROSPECTUS]
 
                     (This page intentionally left blank.)
 
                                       79
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
    The following table sets forth the costs and expenses, other than
underwriting discounts and commissions, payable by the Registrant in connection
with the sale of Common Stock being registered. All amounts are estimates except
the Securities and Exchange Commission registration fee, the NASD filing fee and
the Nasdaq National Market listing fee.
 
   
<TABLE>
<CAPTION>
                                                                                    AMOUNT
                                                                                  TO BE PAID
                                                                                 -------------
<S>                                                                              <C>
Securities and Exchange Commission registration fee............................   $    25,325
NASD filing fee................................................................         9,100
Nasdaq National Market listing fee.............................................        95,000
Printing and engraving expenses................................................       400,000
Professional fees and expenses.................................................     1,150,000
Blue Sky fees and expenses.....................................................         5,000
Transfer agent fees............................................................         5,000
Miscellaneous..................................................................        10,575
                                                                                 -------------
    Total......................................................................   $ 1,700,000
                                                                                 -------------
                                                                                 -------------
</TABLE>
    
 
   
ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
    
 
    Section 145 of the Delaware General Corporation Law permits a corporation to
include in its charter documents, and in agreements between the corporation and
its directors and officers, provisions expanding the scope of indemnification
beyond that specifically provided by the current law.
 
    Article V of the Registrant's Restated Certificate of Incorporation provides
for the indemnification of directors to the fullest extent permissible under
Delaware law.
 
    Article VI of the Registrant's Bylaws provides for the indemnification of
officers and directors (and allows the Registrant to indemnify other employees
and third parties) acting on behalf of the Registrant if such person acted in
good faith and in a manner reasonably believed to be in and not opposed to the
best interest of the Registrant, and, with respect to any criminal action or
proceeding, the indemnified party had no reason to believe his or her conduct
was unlawful.
 
    The Registrant intends to enter into indemnification agreements with its
directors and executive officers, in addition to indemnification provided for in
the Registrant's Bylaws, and intends to enter into indemnification agreements
with any new directors and executive officers in the future.
 
    The Registrant intends to obtain directors' and officers' insurance
providing indemnification for certain of the Registrant's directors, officers
and employees for certain liabilities.
 
    Reference is also made to Section 7 of the Underwriting Agreement to be
filed as Exhibit 1.1 to the Registration Statement for information concerning
the Underwriters' obligation to indemnify the Registrant and its officers and
directors in certain circumstances.
 
ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES
 
    (a) From its founding in December 1995, through August 31, 1998, the
Registrant has issued and sold the following unregistered securities:
 
                                      II-1
<PAGE>
        (1) Between January 26 and August 15, 1996, the Registrant sold an
    aggregate of 10,285,000 shares of Series A Preferred Stock to 22 investors
    at a purchase price of $.50 per share, which was paid in cash.
 
        (2) On January 26, 1996, the Registrant sold 1,000,000 shares of Common
    Stock to four investors at a purchase price of $.05 per share, which was
    paid in cash.
 
        (3) On July 8, 1996, the Registrant sold 10,000 shares of Series A
    Preferred Stock valued at $5,000 to a consulting firm for services rendered.
 
        (4) Between October 1 and November 27, 1996, the Registrant sold an
    aggregate of 3,000,000 shares of Series B Preferred Stock to five investors
    at a purchase price of $2.00 per share, which was paid in cash.
 
        (5) On November 1, 1996, the Registrant issued warrants to purchase (i)
    1,000,000 shares of Series B Preferred Stock with an exercise price of $2.00
    per share to KPCB VII Associates, L.P., in consideration of services
    rendered by David Schnell as President and Chief Executive Officer with a
    value of $504,900 and (ii) 1,000,000 shares of Series B Preferred Stock with
    an exercise price of $2.00 per share to Clark Ventures as an incentive for
    James H. Clark to continue to provide services.
 
        (6) On July 1, 1997, the Registrant issued warrants to purchase a total
    of 61,947 shares of Series B Preferred Stock with an exercise price of $2.00
    per share to five investors pursuant to a bridge loan financing.
 
        (7) Between July 1 and July 27, 1997, the Registrant sold an aggregate
    of 2,600,000 shares of Series C Preferred Stock to nine investors at a
    purchase price of $2.50 per share, in consideration of cash and cancellation
    of indebtedness incurred in connection with a bridge loan financing.
 
        (8) Between July 7 and July 16, 1997, the Registrant sold 25,000 shares
    of Series B Preferred Stock to the same consulting firm referred to in (3)
    above at a purchase price of $2.00 per share for services rendered.
 
        (9) On July 11, 1997, the Registrant sold 10,000 shares of Series A
    Preferred Stock valued at $5,000 to the same consulting firm referred to in
    (3) above for services rendered.
 
       (10) On July 11, 1997, the Registrant sold 250,000 shares of Series B
    Preferred Stock to W. Michael Long at a purchase price of $2.00 per share,
    paid with an amount of cash equal to the par value of the purchased shares
    and with a promissory note that has subsequently been paid in full for the
    remainder.
 
       (11) On July 11, 1997, the Registrant issued a warrant to purchase
    750,000 shares of Series B Preferred Stock with an exercise price of $2.00
    per share to W. Michael Long as an incentive to continue to provide
    services.
 
       (12) On July 22, 1997, the Registrant sold 15,000 shares of Series B
    Preferred Stock to Hugh Reinhuff, a former Director, at a purchase price of
    $2.00 per share, which was paid in cash.
 
       (13) Between October 17 and December 19, 1997, the Registrant sold an
    aggregate of 4,807,692 shares of Series D Preferred Stock to 13 investors at
    a purchase price of $5.20 per share, which was paid in cash.
 
       (14) On May 1, 1998, the Registrant issued 1,000,000 shares of Series B
    Preferred Stock to Clark Ventures and 17,229 shares of Series B Preferred
    Stock to James H. Clark upon the exercise of warrants with exercise prices
    of $2.00 per share which were paid in cash.
 
       (15) On May 19, 1998, in connection with the acquisition of ActaMed
    Corporation, 22,019,921 shares of the Registrant's Preferred Stock were
    converted into Common Stock on a one-for-one basis
 
                                      II-2
<PAGE>
    and warrants to purchase 1,794,718 shares of the Registrant's Preferred
    Stock were exchanged for warrants to purchase an equal number of shares of
    Common Stock.
 
       (16) On May 19, 1998, in connection with the ActaMed acquisition, the
    Registrant assumed options to purchase ActaMed Common Stock which were held
    by former ActaMed employees which are now exercisable for an aggregate of
    3,100,489 shares of Registrant's Common Stock.
 
       (17) On May 19, 1998, the Registrant issued 23,271,355 shares of its
    Common Stock to former shareholders of ActaMed in connection with the
    acquisition of ActaMed Corporation ("ActaMed") in exchange for all of the
    issued and outstanding shares of capital stock of ActaMed.
 
       (18) On May 19, 1998, in connection with the acquisition of ActaMed, the
    Registrant assumed a warrant held by IBM to purchase shares of ActaMed
    capital stock which is now exercisable for an aggregate of 282,522 shares of
    Healtheon Common Stock with an exercise price of $7.97 per share.
 
       (19) On June 26, 1998, the Registrant sold 1,336,209 shares of Common
    Stock valued at $3.67 to SmithKline Labs in consideration for certain assets
    and licenses relating to SmithKline Labs.
 
       (20) Since January 1996, the Registrant has granted options to purchase
    14,387,534 shares of Registrant's Common Stock to employees pursuant to the
    Company's 1996 Stock Plan.
 
       (21) From July 6, 1996 through August 31, 1998, the Company issued an
    aggregate of 5,190,302 shares of Common Stock as the result of exercises of
    options or stock purchase rights for aggregate consideration, in the form of
    cash and promissory notes, of approximately $3.9 million.
 
       (22) On August 25, 1998, the Registrant issued 1,600,000 shares of Common
    Stock valued at $12.8 million to Metis, LLC in connection with acquisition
    of certain assets of Metis, LLC of which 476,548 shares will be issued to
    employees pursuant to restricted stock purchase agreements subject to a
    lapsing right of repurchase, at the option of the Company, over the
    agreements' respective vesting periods.
 
    (b) There were no underwriters, brokers or finders employed in connection
with any of the transactions set forth above.
 
    (c) The transactions referred to in numbers 16-18 and 22 were exempt from
registration pursuant to the provisions of Section 3(a)(10) of the Securities
Act. The sales of the above securities were deemed to be exempt from
registration under the Securities Act in reliance on Section 4(2) of the
Securities Act, or Regulation D promulgated thereunder, or, with respect to
issuances to employees, Rule 701 promulgated under Section 3(b) of the
Securities Act as transactions by an issuer not involving a public offering or
transactions pursuant to compensatory benefit plans and contracts relating to
compensation as provided under such Rule 701. The recipients of securities in
each such transaction represented their intentions to acquire the securities for
investment only and not with a view to or for sale in connection with any
distribution thereof and appropriate legends were affixed to the instruments
representing such securities issued in such transactions. All recipients had
adequate access, through their relationships with the Company, to information
about the Registrant.
 
                                      II-3
<PAGE>
ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
    (a) EXHIBITS
 
   
<TABLE>
<S>        <C>
1.1        Form of Underwriting Agreement.
2.0**      Agreement and Plan of Reorganization, dated as of February 24, 1998, by
             and among the Registrant, MedNet Acquisition Corp. and ActaMed
             Corporation.
2.1**      Agreement and Plan of Merger, dated as of March 1, 1996, by and among
             ActaMed Corporation, EDI Acquisition, Inc., UHC Green Acquisition, Inc.
             and United HealthCare Corporation.
2.2**      Asset Purchase Agreement, dated June 25, 1998, among the Registrant, Metis
             Acquisition Corp. and Metis, LLC.
3.1**      Amended and Restated Certificate of Incorporation of the Registrant, as
             currently in effect.
3.2**      Form of Amended and Restated Certificate of Incorporation, to be filed
             prior to the closing of the offering made under this Registration
             Statement.
3.3**      Bylaws of the Registrant, as currently in effect.
3.4**      Form of Bylaws of the Registrant, to be adopted prior to the closing of
             the offering made under this Registration Statement.
4.1        Specimen Common Stock certificate.
5.1        Form of Opinion of Wilson Sonsini Goodrich & Rosati, Professional
             Corporation, regarding the legality of the securities being issued.
10.1**     Form of Indemnification Agreement entered into by the Registrant with each
             of its directors and executive officers.
10.2**     1996 Stock Plan and form of Stock Option Agreement thereunder.
10.3**     ActaMed Corp. 1997 Stock Option Plan
10.4**     ActaMed Corp. 1996 Stock Option Plan
10.5**     ActaMed Corp. 1995 Stock Option Plan
10.6**     ActaMed Corp. 1994 Stock Option Plan.
10.7**     ActaMed Corp. 1993 Class B Common Stock Option Plan.
10.8**     ActaMed Corp. 1992 Stock Option Plan.
10.9**     ActaMed Corp. 1996 Director Stock Option Plan, as amended.
10.10**    Amended and Restated Investors' Rights Agreement dated as of May 19, 1998
             among the Registrant and certain of the Registrant's securityholders.
10.11**    Lease Agreement, dated December 2, 1997, between Larvan Properties and
             Registrant.
10.12**    Lease Agreement, dated November 6, 1995, as amended, between ActaMed
             Corporation and ZML-Central Park, L.L.C.
10.13+     Services and License Agreement, dated as of April 4, 1996, between ActaMed
             Corporation and United HealthCare Corporation.
10.14+     Services Agreement, dated as of December 31, 1997, as amended, between
             ActaMed Corporation and SmithKline Beecham Clinical Laboratories, Inc.
10.15+     Assets Purchase Agreement, dated as of December 31, 1997, as amended,
             between ActaMed Corporation and SmithKline Beecham Clinical
             Laboratories, Inc.
10.16+     License Agreement, dated as of December 31, 1997, between ActaMed
             Corporation and SmithKline Beecham Clinical Laboratories, Inc.
</TABLE>
    
 
                                      II-4
<PAGE>
   
<TABLE>
<S>        <C>
10.17+     Development Agreement, dated as of October 31, 1997, as amended, between
             ActaMed Corporation and SmithKline Beecham Clinical Laboratories, Inc.
10.18+     Services, Development and License Agreement, dated as of December 15,
             1997, between the Registrant and Beech Street Corporation.
10.19+     Services, Development and License Agreement, dated as of September 30,
             1997, between the Registrant and Brown & Toland Physician Services
             Organization.
10.20**    Amended and Restated Securities Purchase Agreement, dated as of January
             26, 1996, between the Registrant and investors.
10.21**    Amended and Restated Series B Preferred Stock Purchase Agreement dated
             October 31, 1996, between Registrant and investors.
10.22**    Form of Series B Preferred Stock Purchase Warrant between the Registrant
             and certain of the Registrant's investors.
10.23**    Series C Preferred Stock Purchase Agreement dated July 25, 1997, between
             the Registrant and investors.
10.24**    Series D Preferred Stock Purchase Agreement dated October 13, 1997,
             between the Registrant and investors.
10.25**    Full Recourse Promissory Note dated as of July 11, 1997, between the
             Registrant and W. Michael Long.
10.26**    Form of Promissory Note for Bridge Financing
10.27**    W. Michael Long Employment Agreement
10.28**    Michael Hoover Employment Agreement
10.29**    1998 Employee Stock Purchase Plan
21.1**     Subsidiaries of the Registrant.
23.1       Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation
             (included in Exhibit 5.1).
23.2       Consent of Ernst & Young LLP, independent auditors (see page II-8).
23.3       Consent of Deloitte & Touche LLP, independent auditors (see page II-9).
23.4       Consent of Deloitte & Touche LLP, independent auditors (see page II-10).
24.1**     Power of Attorney.
27.1**     Financial Data Schedule.
</TABLE>
    
 
- ---------
 
   
**  Previously filed.
    
 
+   Confidential treatment requested as to portions of this exhibit.
 
    (b) FINANCIAL STATEMENT SCHEDULES
 
    All schedules have been omitted because the information required to be set
forth therein is not applicable or is shown in the consolidated financial
statements or notes thereto.
 
ITEM 17.  UNDERTAKINGS
 
    (a) The undersigned hereby undertakes to provide to the Underwriters at the
closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.
 
    (b) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the provisions referenced in Item 14 of this Registration
Statement or otherwise, the Registrant has been advised that in the opinion of
the Securities and Exchange Commission such indemnification is against public
policy as expressed in the
 
                                      II-5
<PAGE>
Securities Act, and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered hereunder, the Registrant will,
unless in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
    (c) The undersigned Registrant hereby undertakes that:
 
        (1) For purposes of determining any liability under the Securities Act,
    the information omitted from the form of Prospectus filed as part of this
    Registration Statement in reliance upon Rule 430A and contained in a form of
    Prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
    497(h) under the Securities Act shall be deemed to be part of this
    Registration Statement as of the time it was declared effective.
 
        (2) For the purpose of determining any liability under the Securities
    Act, each post-effective amendment that contains a form of Prospectus shall
    be deemed to be a new Registration Statement relating to the securities
    offered therein, and the offering of such securities at that time shall be
    deemed to be the initial BONA FIDE offering thereof.
 
                                      II-6
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant has duly caused this Amendment to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Santa Clara, State of
California, on this 14th day of October, 1998.
    
 
<TABLE>
<S>                             <C>  <C>
                                HEALTHEON CORPORATION
 
                                By:          /s/ JOHN L. WESTERMANN III
                                     -----------------------------------------
                                               John L. Westermann III
                                              CHIEF FINANCIAL OFFICER
</TABLE>
 
    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS AMENDMENT
TO REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED.
 
   
<TABLE>
<CAPTION>
          SIGNATURE                       TITLE                    DATE
- ------------------------------  --------------------------  -------------------
<C>                             <S>                         <C>
     /s/ W. MICHAEL LONG*       Chief Executive Officer
- ------------------------------    and Director (Principal    October 14, 1998
       W. Michael Long            Executive Officer)
 
  /s/ JOHN L. WESTERMANN III    Chief Financial Officer
- ------------------------------    (Principal Financial and   October 14, 1998
    John L. Westermann III        Accounting Officer)
 
- ------------------------------  Chairman of the Board        October 14, 1998
        James H. Clark
 
      /s/ L. JOHN DOERR*
- ------------------------------  Director                     October 14, 1998
        L. John Doerr
 
     /s/ MICHAEL HOOVER*
- ------------------------------  President and Director       October 14, 1998
        Michael Hoover
 
   /s/ C. RICHARD KRAMLICH*
- ------------------------------  Director                     October 14, 1998
     C. Richard Kramlich
 
   /s/ WILLIAM W. MCGUIRE,
            M.D.*
- ------------------------------  Director                     October 14, 1998
   William W. McGuire, M.D.
 
      /s/ P. E. SADLER*
- ------------------------------  Director                     October 14, 1998
         P. E. Sadler
 
     /s/ TADATAKA YAMADA*
- ------------------------------  Director                     October 14, 1998
       Tadataka Yamada
</TABLE>
    
 
<TABLE>
<S>        <C>                                   <C>
*By:            /s/ JOHN L. WESTERMANN III                  /s/ JACK DENNISON
           ------------------------------------  --------------------------------------
                  John L. Westermann III                      Jack Dennison
                     ATTORNEY-IN-FACT                       ATTORNEY-IN-FACT
</TABLE>
 
                                      II-7
<PAGE>
                                                                    EXHIBIT 23.2
 
               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
   
    We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated July 24, 1998 (except Note 14 as to which the date
is September 26, 1998) in Amendment No. 4 to the Registration Statement on Form
S-1 and related Prospectus of Healtheon Corporation for the registration of
shares of its Common Stock.
    
 
                                          /s/ Ernst & Young LLP
 
   
Palo Alto, California
    
 
   
October 13, 1998
    
 
                                      II-8
<PAGE>
                                                                    EXHIBIT 23.3
 
INDEPENDENT AUDITORS' CONSENT
 
   
We consent to the use in this Amendment No. 4 to Registration Statement No.
333-60427 of Healtheon Corporation on Form S-1 of our report dated June 20,
1997, (September 26, 1998 as to Note 14 and Note 2 -- Net Loss Per Common Share,
paragraph 2) (which expresses an unqualified opinion and includes an explanatory
paragraph relating to the restatement of ActaMed Corporation's 1996 financial
statements as described in Note 14), relating to the consolidated financial
statements of ActaMed Corporation as of December 31, 1996 and for the two years
then ended (the consolidated financial statements for 1996 are not separately
presented herein) appearing in the Prospectus, which is part of this
Registration Statement.
    
 
We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
/s/ DELOITTE & TOUCHE LLP
 
   
Atlanta, Georgia
October 16, 1998
    
 
                                      II-9
<PAGE>
                                                                    EXHIBIT 23.4
 
INDEPENDENT AUDITORS' CONSENT
 
   
We consent to the use in this Amendment No. 4 to Registration Statement No.
333-60427 of Healtheon Corporation on Form S-1 of our report dated April 4,
1996, relating to the statements of divisional net loss and United's net
investment and of divisional cash flows for the year ended December 31, 1995 of
EDI Services Group (a Division of United HealthCare Corporation) appearing in
the Prospectus, which is part of this Registration Statement.
    
 
We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
/s/ DELOITTE & TOUCHE LLP
 
   
Minneapolis, Minnesota
October 16, 1998
    
 
                                     II-10
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBIT                                                                                                SEQUENTIAL
  NUMBER                                           DESCRIPTION                                          PAGE NUMBER
- ----------  ------------------------------------------------------------------------------------------  -----------
<S>         <C>                                                                                         <C>
1.1         Form of Underwriting Agreement.
 
2.0**       Agreement and Plan of Reorganization, dated as of February 24, 1998, by and among the
              Registrant, MedNet Acquisition Corp. and ActaMed Corporation.
 
2.1**       Agreement and Plan of Merger, dated as of March 1, 1996, by and among ActaMed Corporation,
              EDI Acquisition, Inc., UHC Green Acquisition, Inc. and United HealthCare Corporation.
 
2.2**       Asset Purchase Agreement, dated June 25, 1998, among the Registrant, Metis Acquisition
              Corp. and Metis, LLC.
 
3.1**       Amended and Restated Certificate of Incorporation of the Registrant, as currently in
              effect.
 
3.2**       Form of Amended and Restated Certificate of Incorporation, to be filed prior to the
              closing of the offering made under this Registration Statement.
 
3.3**       Bylaws of the Registrant, as currently in effect.
 
3.4**       Form of Bylaws of the Registrant, to be adopted prior to the closing of the offering made
              under this Registration Statement.
 
4.1         Specimen Common Stock certificate.
 
5.1         Form of Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation, regarding
              the legality of the securities being issued.
 
10.1**      Form of Indemnification Agreement entered into by the Registrant with each of its
              directors and executive officers.
 
10.2**      1996 Stock Plan and form of Stock Option Agreement thereunder.
 
10.3**      ActaMed Corp. 1997 Stock Option Plan
 
10.4**      ActaMed Corp. 1996 Stock Option Plan
 
10.5**      ActaMed Corp. 1995 Stock Option Plan
 
10.6**      ActaMed Corp. 1994 Stock Option Plan.
 
10.7**      ActaMed Corp. 1993 Class B Common Stock Option Plan.
 
10.8**      ActaMed Corp. 1992 Stock Option Plan.
 
10.9**      ActaMed Corp. 1996 Director Stock Option Plan, as amended.
 
10.10**     Amended and Restated Investors' Rights Agreement dated as of May 19, 1998 among the
              Registrant and certain of the Registrant's securityholders.
 
10.11**     Lease Agreement, dated December 2, 1997, between Larvan Properties and Registrant.
 
10.12**     Lease Agreement, dated November 6, 1995, as amended, between ActaMed Corporation and
              ZML-Central Park, L.L.C.
 
10.13+      Services and License Agreement, dated as of April 4, 1996, between ActaMed Corporation and
              United HealthCare Corporation.
 
10.14+      Services Agreement, dated as of December 31, 1997, as amended, between ActaMed Corporation
              and SmithKline Beecham Clinical Laboratories, Inc.
 
10.15+      Assets Purchase Agreement, dated as of December 31, 1997, as amended, between ActaMed
              Corporation and SmithKline Beecham Clinical Laboratories, Inc.
 
10.16+      License Agreement, dated as of December 31, 1997, between ActaMed Corporation and
              SmithKline Beecham Clinical Laboratories, Inc.
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
 EXHIBIT                                                                                                SEQUENTIAL
  NUMBER                                           DESCRIPTION                                          PAGE NUMBER
- ----------  ------------------------------------------------------------------------------------------  -----------
<S>         <C>                                                                                         <C>
10.17+      Development Agreement, dated as of October 31, 1997, as amended, between ActaMed
              Corporation and SmithKline Beecham Clinical Laboratories, Inc.
 
10.18+      Services, Development and License Agreement, dated as of December 15, 1997, between the
              Registrant and Beech Street Corporation.
 
10.19+      Services, Development and License Agreement, dated as of September 30, 1997, between the
              Registrant and Brown & Toland Physician Services Organization.
 
10.20**     Amended and Restated Securities Purchase Agreement, dated as of January 26, 1996, between
              the Registrant and investors.
 
10.21**     Amended and Restated Series B Preferred Stock Purchase Agreement dated October 31, 1996,
              between Registrant and investors.
 
10.22**     Form of Series B Preferred Stock Purchase Warrant between the Registrant and certain of
              the Registrant's investors.
 
10.23**     Series C Preferred Stock Purchase Agreement dated July 25, 1997, between the Registrant
              and investors.
 
10.24**     Series D Preferred Stock Purchase Agreement dated October 13, 1997, between the Registrant
              and investors.
 
10.25**     Full Recourse Promissory Note dated as of July 11, 1997, between the Registrant and W.
              Michael Long.
 
10.26**     Form of Promissory Note for Bridge Financing
 
10.27**     W. Michael Long Employment Agreement
 
10.28**     Michael Hoover Employment Agreement
 
10.29**     1998 Employee Stock Purchase Plan
 
21.1**      Subsidiaries of the Registrant.
 
23.1        Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in Exhibit
              5.1).
 
23.2        Consent of Ernst & Young LLP, independent auditors (see page II-8).
 
23.3        Consent of Deloitte & Touche LLP, independent auditors (see page II-9).
 
23.4        Consent of Deloitte & Touche LLP, independent auditors (see page II-10).
 
24.1**      Power of Attorney.
 
27.1**      Financial Data Schedule.
</TABLE>
    
 
- ---------
 
   
**  Previously filed.
    
 
+   Confidential treatment requested as to portions of this exhibit.

<PAGE>


                                                                    Exhibit 1.1





                               _______________ SHARES



                               HEALTHEON CORPORATION
                                          
                     COMMON STOCK ($.0001 PAR VALUE PER SHARE)



                              UNDERWRITING AGREEMENT





__________, 1998



<PAGE>


                                                            _____________, 1998



Morgan Stanley & Co. Incorporated
Goldman, Sachs & Co.
Hambrecht & Quist LLC
Volpe Brown Whelan & Company, LLC
c/o    Morgan Stanley & Co. Incorporated
       1585 Broadway
       New York, New York  10036

Morgan Stanley & Co. International Limited
Goldman Sachs International
Hambrecht & Quist LLC
Volpe Brown Whelan & Company, LLC
c/o    Morgan Stanley & Co. International Limited
       25 Cabot Square
       Canary Wharf 
       London E14 4QA
       England

Dear Sirs and Mesdames:

              Healtheon Corporation, a Delaware corporation (the "COMPANY"), 
proposes to issue and sell to the several Underwriters (as defined below) 
_________ shares of its Common Stock, $.0001 par value per share (the "FIRM 
SHARES"). 

              It is understood that, subject to the conditions hereinafter 
stated, ____________ Firm Shares (the "U.S. FIRM SHARES") will be sold to the 
several U.S. Underwriters named in Schedule I hereto (the "U.S. 
UNDERWRITERS") in connection with the offering and sale of such U.S. Firm 
Shares in the United States and Canada to United States and Canadian Persons 
(as such terms are defined in the Agreement Between U.S. and International 
Underwriters of even date herewith), and __________ Firm Shares (the 
"INTERNATIONAL SHARES") will be sold to the several International 
Underwriters named in Schedule II hereto (the "INTERNATIONAL UNDERWRITERS") 
in connection with the offering and sale of such International Shares outside 
the United States and Canada to persons other than United States and Canadian 
Persons.  Morgan Stanley & Co. Incorporated and Goldman, Sachs & Co., 
Hambrecht & Quist LLC and Volpe Brown Whelan & Company, LLC shall act as 
representatives (the "U.S. REPRESENTATIVES") of the several U.S. 
Underwriters, and Morgan Stanley & Co. International Limited and Goldman 
Sachs International, Hambrecht & Quist LLC and Volpe Brown Whelan & Company, 
LLC shall act as representatives (the "INTERNATIONAL REPRESENTATIVES") of the 
several International Underwriters.  The U.S. Underwriters and the 
International Underwriters are hereinafter collectively referred to as the 
Underwriters. 



<PAGE>
                                                                     

              The Company also proposes to issue and sell to the several U.S. 
Underwriters not more than an additional __________ shares of its Common 
Stock, $.0001 par value per share (the "ADDITIONAL SHARES") if and to the 
extent that the U.S. Representatives shall have determined to exercise, on 
behalf of the U.S. Underwriters, the right to purchase such shares of common 
stock granted to the U.S. Underwriters in Section 2 hereof.  The Firm Shares 
and the Additional Shares are hereinafter collectively referred to as the 
"SHARES".  The shares of Common Stock, $.0001 par value per share of the 
Company to be outstanding after giving effect to the sales contemplated 
hereby are hereinafter referred to as the "COMMON STOCK". 

              The Company has filed with the Securities and Exchange 
Commission (the "COMMISSION") a registration statement relating to the 
Shares.  The registration statement contains two prospectuses to be used in 
connection with the offering and sale of the Shares:  the U.S. prospectus, to 
be used in connection with the offering and sale of Shares in the United 
States and Canada to United States and Canadian Persons, and the 
international prospectus, to be used in connection with the offering and sale 
of Shares outside the United States and Canada to persons other than United 
States and Canadian Persons.  The international prospectus is identical to 
the U.S. prospectus except for the outside front cover page.  The 
registration statement as amended at the time it becomes effective, including 
the information (if any) deemed to be part of the registration statement at 
the time of effectiveness pursuant to Rule 430A under the Securities Act of 
1933, as amended (the "SECURITIES ACT"), is hereinafter referred to as the 
"REGISTRATION STATEMENT"; the U.S. prospectus and the international 
prospectus in the respective forms first used to confirm sales of Shares are 
hereinafter collectively referred to as the "PROSPECTUS."  If the Company has 
filed an abbreviated registration statement to register additional shares of 
Common Stock pursuant to Rule 462(b) under the Securities Act (the "RULE 462 
REGISTRATION STATEMENT"), then any reference herein to the term "Registration 
Statement" shall be deemed to include such Rule 462 Registration Statement.

              As part of the offering contemplated by this Agreement, Morgan 
Stanley & Co. Incorporated ("MORGAN STANLEY") has agreed to reserve out of 
the Shares set forth opposite its name on Schedule I to this Agreement, up to 
__________ shares, for sale to certain parties designated by the Company 
(collectively, "PARTICIPANTS") (the "DIRECTED SHARE PROGRAM").  The Shares to 
be sold by Morgan Stanley pursuant to the Directed Share Program (the 
"DIRECTED SHARES") will be sold by Morgan Stanley pursuant to this Agreement 
at the public offering price.  Any Directed Shares not orally confirmed for 
purchase by any Participants by the end of the first business day after the 
date on which this Agreement is executed will be offered to the public by 
Morgan Stanley as set forth in the Prospectus.

              1.     REPRESENTATIONS AND WARRANTIES.  The Company represents and
warrants to and agrees with each of the Underwriters that:

              (a)    The Registration Statement has become effective; no stop
       order suspending the effectiveness of the Registration Statement is in
       effect, and no proceedings for such purpose are pending before or
       threatened by the Commission. 


                                       2

<PAGE>

                                                                     


              (b)    (i)  The Registration Statement, when it became effective,
       did not contain and, as amended or supplemented, if applicable, will not
       contain any untrue statement of a material fact or omit to state a
       material fact required to be stated therein or necessary to make the
       statements therein not misleading, (ii) the Registration Statement and
       the Prospectus comply and, as amended or supplemented, if applicable,
       will comply in all material respects with the Securities Act and the
       applicable rules and regulations of the Commission thereunder and (iii)
       the Prospectus does not contain and, as amended or supplemented, if
       applicable, will not contain any untrue statement of a material fact or
       omit to state a material fact necessary to make the statements therein,
       in the light of the circumstances under which they were made, not
       misleading, except that the representations and warranties set forth in
       this paragraph do not apply to statements or omissions in the
       Registration Statement or the Prospectus based upon information relating
       to any Underwriter furnished to the Company in writing by such
       Underwriter through you expressly for use therein. 

              (c)    The Company has been duly incorporated, is validly existing
       as a corporation in good standing under the laws of the jurisdiction of
       its incorporation, has the corporate power and authority to own its
       property and to conduct its business as described in the Prospectus and
       is duly qualified to transact business and is in good standing in each
       jurisdiction in which the conduct of its business or its ownership or
       leasing of property requires such qualification, except to the extent
       that the failure to be so qualified or be in good standing would not have
       a material adverse effect on the Company and its Subsidiaries (as defined
       below), taken as a whole. 

              (d)    Other than Actamed Corporation, a Georgia corporation 
       ("ACTAMED"), UHC Green Acquisition Corp., a Nevada corporation ("UHC") 
       and [Metis Acquisition Subsidiary] ("METIS") (each of Actamed, UHC and 
       Metis are referred to herein as a "SUBSIDIARY" and collectively as the 
       "SUBSIDIARIES"), the Company has no subsidiaries.  Each Subsidiary of 
       the Company has been duly incorporated, is validly existing as a 
       corporation in good standing under the laws of the jurisdiction of its 
       incorporation, has the corporate power and authority to own its 
       property and to conduct its business as described in the Prospectus 
       and is duly qualified to transact business and is in good standing in 
       each jurisdiction in which the conduct of its business or its 
       ownership or leasing of property requires such qualification, except 
       to the extent that the failure to be so qualified or be in good 
       standing would not have a material adverse effect on the Company and 
       its Subsidiaries, taken as a whole.  All of the issued shares of 
       capital stock of each Subsidiary of the Company have been duly and 
       validly authorized and issued, are fully paid and non-assessable and 
       are owned directly by the Company, free and clear of all liens, 
       encumbrances, equities or claims.  The Company does not own, directly 
       or indirectly, an interest in any other corporation, partnership, 
       business, trust or other entity.

              (e)    The Company and each of its Subsidiaries have good and
       marketable title in fee simple to all real property and good and
       marketable title to all personal property 


                                       3

<PAGE>

                                                                       

       owned by them which is material to the business of the Company and the 
       Subsidiaries, taken as a whole, in each case free and clear of all 
       liens, encumbrances and defects except such as are described in the 
       Prospectus or such as do not materially affect the value of such 
       property and do not materially interfere with the use made and 
       proposed to be made of such property by the Company and its 
       Subsidiaries, taken as a whole; and any real property and buildings 
       held under lease by the Company and each of its Subsidiaries are held 
       by them under valid, subsisting and enforceable leases with such 
       exceptions as are not material to the Company and its Subsidiaries, 
       taken as a whole, and do not interfere with the use made and proposed 
       to be made of such property and buildings of the Company and each of 
       its Subsidiaries, in each case except as described in the Prospectus, 
       or which intervention is not material to the Company and its 
       Subsidiaries, taken as a whole.

              (f)    This Agreement has been duly authorized, executed and
       delivered by the Company.

              (g)     The authorized capital stock of the Company conforms as to
       legal matters to the description thereof contained in the Prospectus.

              (h)     The shares of Common Stock outstanding prior to the
       issuance of the Shares have been duly authorized and are validly issued,
       fully paid and non-assessable.  Except as set forth in the Prospectus,
       neither the Company nor any of its Subsidiaries has outstanding any
       options to purchase, or any preemptive rights or other rights to
       subscribe for or to purchase, any securities or obligations convertible
       into, or any contracts or commitments to issue or sell, shares of its
       capital stock or any such options, rights, convertible securities or
       obligations.  All outstanding shares of capital stock and options and
       other rights to acquire capital stock have been issued in compliance with
       the registration and qualification provisions of all applicable federal
       and state securities laws and were not issued in violation of any
       preemptive rights, rights of first refusal or other similar rights.

              (i)    The Shares have been duly authorized and, when issued and
       delivered in accordance with the terms of this Agreement, will be validly
       issued, fully paid and non-assessable, and the issuance of such Shares
       will not be subject to any preemptive or similar rights. 

              (j)    The execution and delivery by the Company of, and the
       performance by the Company of its obligations under, this Agreement will
       not contravene any provision of applicable law or the certificate of
       incorporation or by-laws of the Company or any of its Subsidiaries or any
       agreement or other instrument binding upon the Company or any of its
       Subsidiaries that is material to the Company and its Subsidiaries, taken
       as a whole, or any judgment, order or decree of any governmental body,
       agency or court having jurisdiction over the Company or any Subsidiary,
       and no consent, approval, authorization 


                                       4
<PAGE>

                                                                       


       or order of, or qualification with, any governmental body or agency is 
       required for the performance by the Company of its obligations under 
       this Agreement, except such as may be required by the securities or 
       Blue Sky laws of the various states in connection with the offer and 
       sale of the Shares. 

              (k)    There has not occurred any material adverse change, or any
       development involving a prospective material adverse change, in the
       condition, financial or otherwise, or in the earnings, business or
       operations of the Company and its Subsidiaries, taken as a whole, from
       that set forth in the Prospectus (exclusive of any amendments or
       supplements thereto subsequent to the date of this Agreement). 

              (l)    Subsequent to the respective dates as of which information
       is given in the Registration Statement and the Prospectus, (i) the
       Company and its Subsidiaries have not incurred any material liability or
       obligation, direct or contingent, nor entered into any material
       transaction not in the ordinary course of business; (ii) the Company has
       not purchased any of its outstanding capital stock, nor declared, paid or
       otherwise made any dividend or distribution of any kind on its capital
       stock; and (iii) there has not been any material change in the capital
       stock, short-term debt or long-term debt of the Company and its
       Subsidiaries, except in each case as described in the Prospectus.

              (m)    There are no legal or governmental proceedings pending or
       threatened to which the Company or any of its Subsidiaries is a party or
       to which any of the properties of the Company or any of its Subsidiaries
       is subject that are required to be described in the Registration
       Statement or the Prospectus and are not so described or any statutes,
       regulations, contracts or other documents that are required to be
       described in the Registration Statement or the Prospectus or to be filed
       as exhibits to the Registration Statement that are not described or filed
       as required. 

              (n)    Each of the Company and each of its Subsidiaries has all
       necessary consents, authorizations, approvals, orders, certificates and
       permits of and from, and has made all declarations and filings with, all
       federal, state, local, foreign and other governmental or regulatory
       authorities, all self-regulatory organizations and all courts and other
       tribunals, to own, lease, license and use its properties and assets and
       to conduct its business in the manner described in the Prospectus, except
       to the extent that the failure to obtain or file would not have a
       material adverse effect on the Company and its Subsidiaries taken as a
       whole.  Neither the Company nor any of its Subsidiaries has received any
       notice of proceedings related to the revocation or modification of any
       such consent, authorization, approval, order, certificate or permit
       which, singly or in the aggregate, if the subject of any unfavorable
       decision, ruling or finding, would result in a material adverse change in
       the condition, financial or otherwise, or in the earnings, business or
       operations of the Company and its Subsidiaries, taken as a whole, except
       as described in the Prospectus.


                                        5

<PAGE>

                                                                       


              (o)    Each preliminary prospectus filed as part of the 
       registration statement as originally filed or as part of any amendment 
       thereto, or filed pursuant to Rule 424 under the Securities Act, 
       complied when so filed in all material respects with the Securities 
       Act and the applicable rules and regulations of the Commission 
       thereunder. 

              (p)    The Company is not and, after giving effect to the offering
       and sale of the Shares and the application of the proceeds thereof as
       described in the Prospectus, will not be an "investment company" as such
       term is defined in the Investment Company Act of 1940, as amended.

              (q)    The Company and each of its Subsidiaries (i) are in
       compliance with any and all applicable foreign, federal, state and local
       laws and regulations relating to the protection of human health and
       safety, the environment or hazardous or toxic substances or wastes,
       pollutants or contaminants ("ENVIRONMENTAL LAWS"), (ii) have received all
       permits, licenses or other approvals required of them under applicable
       Environmental Laws to conduct their respective businesses and (iii) are
       in compliance with all terms and conditions of any such permit, license
       or approval, except where such noncompliance with Environmental Laws,
       failure to receive required permits, licenses or other approvals or
       failure to comply with the terms and conditions of such permits, licenses
       or approvals would not, singly or in the aggregate, have a material
       adverse effect on the Company and its Subsidiaries, taken as a whole. 

              (r)    There are no costs or liabilities associated with
       Environmental Laws (including, without limitation, any capital or
       operating expenditures required for clean-up, closure of properties or
       compliance with Environmental Laws or any permit, license or approval,
       any related constraints on operating activities and any potential
       liabilities to third parties) which would, singly or in the aggregate,
       have a material adverse effect on the Company and its Subsidiaries, taken
       as a whole. 

              (s)    Except as described in the Prospectus, there are no
       contracts, agreements or understandings between the Company and any
       person granting such person the right to require the Company to file a
       registration statement under the Securities Act with respect to any
       securities of the Company or to require the Company to include such
       securities with the Shares registered pursuant to the Registration
       Statement.  

              (t)    The Company and each of its Subsidiaries are insured by
       insurers of recognized financial responsibility against such losses and
       risks and in such amounts as are prudent and customary in the businesses
       in which they are engaged; neither the Company nor any of its
       Subsidiaries has been refused any insurance coverage sought or applied
       for; and neither the Company nor its Subsidiaries has any reason to
       believe that it will not be able to renew its existing insurance coverage
       as and when such coverage expires or to obtain similar coverage from
       similar insurers as may be necessary to continue its business at a cost
       that would not materially and adversely affect the 


                                       6

<PAGE>

                                                                       


       condition, financial or otherwise, or the earnings, business or 
       operations of the Company and its Subsidiaries, taken as a whole.

              (u)    The financial statements, including the notes thereto,
       included in the Registration Statement and the Prospectus fairly present,
       in all material respects, the financial position of the Company as of the
       dates indicated and the results of its operations for the periods
       specified; said financial statements have been prepared in conformity
       with generally accepted accounting principles applied on a consistent
       basis.

              (v)    Neither the Company nor, to the Company's knowledge, any
       other party is in violation or breach of, or in default with respect to,
       complying with any material provision of any contract, agreement,
       instrument, lease, license, arrangement or understanding which is
       material to the Company and its Subsidiaries taken as a whole, and each
       such contract, agreement, instrument, lease, license, arrangement and
       understanding is in full force and is the legal, valid and binding
       obligation of the Company or its Subsidiary and, to the Company's
       knowledge, the other parties thereto and is enforceable against the
       Company or its Subsidiary and, to the Company's knowledge, against the
       other parties thereto in accordance with its terms.

              (w)    The Company has complied with all provisions of Section
       517.075, Florida Statutes relating to doing business with the Government
       of Cuba or with any person or affiliate located in Cuba.

              (x)    Except as disclosed in the Prospectus, (i) the Company and
       each of its Subsidiaries owns or possesses all material patents, patent
       rights, licenses, inventions, copyrights, know-how (including trade
       secrets and other unpatented and/or unpatentable proprietary or
       confidential information, systems or procedures), trademarks, service
       marks, trade names, technology and know-how currently employed by them to
       conduct their respective businesses in the manner described in the
       Prospectus, (ii) neither the Company nor any of its Subsidiaries has
       received any notice of infringement of or conflict with (and neither the
       Company nor any of its Subsidiaries knows of any infringement or conflict
       with) asserted rights of others with respect to any of the foregoing
       which, singly or in the aggregate, if the subject of an unfavorable
       decision, ruling or finding, would have a material adverse effect upon
       the Company and its Subsidiaries, taken as a whole, and (iii) the
       discoveries, inventions, products or processes of the Company and each of
       its Subsidiaries referred to in the Prospectus do not, to the knowledge
       of the Company or any of its Subsidiaries, infringe or conflict with any
       right or patent of any third party, or any discovery, invention, product
       or process that would have a material adverse effect on the Company and
       its Subsidiaries, taken as a whole.

              (y)    The Company and its Subsidiaries maintain a system of
       internal accounting controls sufficient to provide reasonable assurance
       that (i) transactions are executed in accordance with management's
       general or specific authorizations; 


                                       7

<PAGE>

                                                                       


       (ii) transactions are recorded as necessary to permit preparation of 
       financial statements in conformity with generally accepted accounting 
       principles and to maintain asset accountability; (iii) access to 
       assets is permitted only in accordance with management's general or 
       specific authorization; and (iv) the recorded accountability for 
       assets is compared with the existing assets at reasonable intervals 
       and appropriate action is taken with respect to any differences.

              (z)    No material labor dispute with the employees of the Company
       or any of its Subsidiaries exists or, to the knowledge of the Company, is
       imminent; and the Company is not aware of any existing, threatened or
       imminent labor disturbance by the employees of any of its principal
       suppliers, manufacturers or contractors that could have a material
       adverse effect on the Company and its Subsidiaries, taken as a whole.

              (aa)   All outstanding shares of Common Stock, and all securities
       convertible into or exercisable or exchangeable for Common Stock, are
       subject to valid,, binding and enforceable agreements with Morgan Stanley
       (collectively, the "LOCK-UP AGREEMENTS") that restrict the holders
       thereof from selling, making any short sale or, granting any option for
       the purchase of, or otherwise transferring or disposing of, any of such
       shares of Common Stock, or any such securities convertible into or
       exercisable or exchangeable for Common Stock, for a period of 180 days
       after the date of the Prospectus without the prior written consent of
       Morgan Stanley.

              (bb)   As of the date the Registration Statement became effective,
       the Common Stock was authorized for listing on the Nasdaq National Market
       upon official notice of issuance.

              (cc)   The Company represents and warrants to Morgan Stanley that
       (i) the Registration Statement, the Prospectus and any preliminary
       prospectus comply, and any further amendments or supplements thereto will
       comply, with any applicable laws or regulations of foreign jurisdictions
       in which the Prospectus or any preliminary prospectus, as amended or
       supplemented, if applicable, are distributed in connection with the
       Directed Share Program, and that, (ii) no authorization, approval,
       consent, license, order, registration or qualification of or with any
       government, governmental instrumentality or court, other than such as
       have been obtained, is necessary under the securities laws and
       regulations of foreign jurisdictions in which the Directed Shares are
       offered outside the United States.

              (dd)   The Company has not offered, or caused the Underwriters to
       offer, Shares to any person pursuant to the Directed Share Program with
       the specific intent to unlawfully influence (i) a customer or supplier of
       the Company to alter the customer's or supplier's level or type of
       business with the Company, or (ii) a trade journalist or publication to
       write or publish favorable information about the Company or its
       applications or services.


                                       8

<PAGE>

                                                                       



              2.     AGREEMENTS TO SELL AND PURCHASE.  The Company hereby 
agrees to sell to the several Underwriters, and each Underwriter, upon the 
basis of the representations and warranties herein contained, but subject to 
the conditions hereinafter stated, agrees, severally and not jointly, to 
purchase from the Company the respective numbers of Firm Shares set forth in 
Schedules I and II hereto opposite its names at U.S.$_____ a share ("PURCHASE 
PRICE"). 

              On the basis of the representations and warranties contained in 
this Agreement, and subject to its terms and conditions, the Company agrees 
to sell to the U.S. Underwriters the Additional Shares, and the U.S. 
Underwriters shall have a one-time right to purchase, severally and not 
jointly, up to __________  Additional Shares at the Purchase Price.   If the 
U.S. Representatives, on behalf of the U.S. Underwriters, elect to exercise 
such option, the U.S. Representatives shall so notify the Company in writing 
not later than 30 days after the date of this Agreement, which notice shall 
specify the number of Additional Shares to be purchased by the U.S. 
Underwriters and the date on which such shares are to be purchased.  Such 
date may be the same as the Closing Date (as defined below) but not earlier 
than the Closing Date nor later than ten business days after the date of such 
notice.  Additional Shares may be purchased as provided in Section 4 hereof 
solely for the purpose of covering over-allotments made in connection with 
the offering of the Firm Shares.  If any Additional Shares are to be 
purchased, each U.S. Underwriter agrees, severally and not jointly, to 
purchase the number of Additional Shares (subject to such adjustments to 
eliminate fractional shares as the U.S. Representatives may determine) that 
bears the same proportion to the total number of Additional Shares to be 
purchased as the number of U.S. Firm Shares set forth in Schedule I hereto 
opposite the name of such U.S. Underwriter bears to the total number of U.S. 
Firm Shares.

              The Company hereby agrees that, without the prior written 
consent of Morgan Stanley on behalf of the Underwriters, it will not, during 
the period ending 180 days after the date of the Prospectus, (i) offer, 
pledge, sell, contract to sell, sell any option or contract to purchase, 
purchase any option or contract to sell, grant any option, right or warrant 
to purchase, lend, or otherwise transfer or dispose of, directly or 
indirectly, any shares of Common Stock or any securities convertible into or 
exercisable or exchangeable for Common Stock or (ii) enter into any swap or 
other arrangement that transfers to another, in whole or in part, any of the 
economic consequences of ownership of the Common Stock, whether any such 
transaction described in clause (i) or (ii) above is to be settled by 
delivery of Common Stock or such other securities, in cash or otherwise.  The 
foregoing sentence shall not apply to (A) the Shares to be sold hereunder or 
(B) the issuance by the Company of shares of Common Stock upon the exercise 
of an option or warrant or the conversion of a security outstanding on the 
date hereof of which the Underwriters have been advised in writing or 
described as outstanding or reserved for issuance under the option plans 
described in the Prospectus, or any other issuances of Common Stock or 
options to acquire Common Stock hereafter under the option or equity 
incentive plans described in the Prospectus; provided that with respect to 
securities issued pursuant to the exceptions set forth in clause (B), the 
holders of such securities shall enter into Lock-Up Agreements on the terms 
specified in Section 1(aa).

                                       9

<PAGE>

                                                                       


              3.     TERMS OF PUBLIC OFFERING.  The Company is advised by you
that the Underwriters propose to make a public offering of their respective
portions of the Shares as soon after the Registration Statement and this
Agreement have become effective as in your judgment is advisable.  The Company
is further advised by you that the Shares are to be offered to the public
initially at U.S.$_____ a share (the "PUBLIC OFFERING PRICE") and to certain
dealers selected by you at a price that represents a concession not in excess of
U.S.$____ a share under the Public Offering Price, and that any Underwriter may
allow, and such dealers may reallow, a concession, not in excess of U.S.$____ a
share, to any Underwriter or to certain other dealers. 

              4.     PAYMENT AND DELIVERY.  Payment for the Firm Shares shall be
made to the Company in Federal or other funds immediately available in New York
City against delivery of such Firm Shares for the respective accounts of the
several Underwriters at 10:00 a.m., New York City time, on ____________, 1998,
or at such other time on the same or such other date, not later than _________,
1998, as shall be designated in writing by you.   The time and date of such
payment are hereinafter referred to as the "CLOSING DATE." 

              Payment for any Additional Shares shall be made to the Company in
Federal or other funds immediately available in New York City against delivery
of such Additional Shares for the respective accounts of the several
Underwriters at 10:00 a.m., New York City time, on the date specified in the
notice described in Section 2 or at such other time on the same or on such other
date, in any event not later than _______, 1998, as shall be designated in
writing by the U.S. Representatives.   The time and date of such payment are
hereinafter referred to as the "OPTION CLOSING DATE."

              Certificates for the Firm Shares and Additional Shares shall be in
definitive form and registered in such names and in such denominations as you
shall request in writing not later than one full business day prior to the
Closing Date or the Option Closing Date, as the case may be.  The certificates
evidencing the Firm Shares and Additional Shares shall be delivered to you on
the Closing Date or the Option Closing Date, as the case may be, for the
respective accounts of the several Underwriters, with any transfer taxes payable
in connection with the transfer of the Shares to the Underwriters duly paid,
against payment of the Purchase Price therefor. 

              5.     CONDITIONS TO THE UNDERWRITERS' OBLIGATIONS.  The
obligations of the Company to sell the Shares to the Underwriters and the
several obligations of the Underwriters to purchase and pay for the Shares on
the Closing Date are subject to the condition that the Registration Statement
shall have become effective not later than [_______] (New York City time) on the
date hereof. 

              The several obligations of the Underwriters are subject to the
following further conditions:

              (a)    Subsequent to the execution and delivery of this Agreement
       and prior to the Closing Date:  


                                       10

<PAGE>

                                                                       


                     (i)    there shall not have occurred any downgrading, nor
              shall any notice have been given of any intended or potential
              downgrading or of any review for a possible change that does not
              indicate the direction of the possible change, in the rating
              accorded any of the Company's securities by any "nationally
              recognized statistical rating organization," as such term is
              defined for purposes of Rule 436(g)(2) under the Securities Act;
              and

                     (ii)   there shall not have occurred any change, or any
              development involving a prospective change, in the condition,
              financial or otherwise, or in the earnings, business or operations
              of the Company and its Subsidiaries, taken as a whole, from that
              set forth in the Prospectus (exclusive of any amendments or
              supplements thereto subsequent to the date of this Agreement)
              that, in your judgment, is material and adverse and that makes it,
              in your judgment, impracticable to market the Shares on the terms
              and in the manner contemplated in the Prospectus.

              (b)    The Underwriters shall have received on the Closing Date a
       certificate, dated the Closing Date and signed by an executive officer of
       the Company, to the effect set forth in Section 5(a) above and to the
       effect that the representations and warranties of the Company contained
       in this Agreement are true and correct as of the Closing Date and that
       the Company has complied with all of the agreements and satisfied all of
       the conditions on its part to be performed or satisfied hereunder on or
       before the Closing Date. 

              The officer signing and delivering such certificate may rely upon
       the best of his or her knowledge as to proceedings threatened. 

              (c)  The Underwriters shall have received on the Closing Date an
       opinion of Wilson Sonsini Goodrich & Rosati, counsel for the Company,
       dated the Closing Date, to the effect that:

                   (i)    the Company has been duly incorporated, is validly 
              existing as a corporation in good standing under the laws of the 
              jurisdiction of its incorporation, has the corporate power 
              and authority to own its property and to conduct its business 
              as described in the Prospectus and is duly qualified to 
              transact business and is in good standing in each jurisdiction 
              in which the conduct of its business or its ownership or 
              leasing of property requires such qualification, except to the 
              extent that the failure to be so qualified or be in good 
              standing would not have a material adverse effect on the 
              Company and its Subsidiaries, taken as a whole;

                   (ii)   each Subsidiary of the Company has been duly 
              incorporated, is validly existing as a corporation in good 
              standing under the laws of the

                                       11

<PAGE>

                                                                       

              jurisdiction of its incorporation, has the corporate power and 
              authority to own its property and to conduct its business as 
              described in the Prospectus and is duly qualified to transact 
              business and is in good standing in each jurisdiction in which 
              the conduct of its business or its ownership or leasing of 
              property requires such qualification, except to the extent that 
              the failure to be so qualified or be in good standing would not 
              have a material adverse effect on the Company and its 
              Subsidiaries, taken as a whole;

                   (iii)  the authorized capital stock of the Company conforms 
              as to legal matters to the description thereof contained in the 
              Prospectus;

                   (iv)   the shares of Common Stock outstanding prior to the
              issuance of the Shares have been duly authorized and are validly 
              issued, fully paid and non-assessable;

                   (v)    all of the issued shares of capital stock of each 
              subsidiary of the Company have been duly and validly authorized 
              and issued, are fully paid and non-assessable and are owned 
              directly by the Company, free and clear of all liens, 
              encumbrances, equities or claims;

                   (vi)   the Shares have been duly authorized and, when issued
              and delivered in accordance with the terms of this Agreement, 
              will be validly issued, fully paid and non-assessable, and the 
              issuance of such Shares will not be subject to any preemptive 
              right or rights of first refusal or similar rights.

                   (vii)  this Agreement has been duly authorized, executed and
              delivered by the Company;

                   (viii) the execution and delivery by the Company of, and the 
              performance by the Company of its obligations under, this 
              Agreement will not contravene any provision of applicable law 
              or the certificate of incorporation or by-laws of the Company 
              or, to such counsel's knowledge, any agreement or other 
              instrument binding upon the Company or any of its Subsidiaries 
              that is material to the Company and its Subsidiaries, taken as 
              a whole, or, to such counsel's knowledge, any judgment, order 
              or decree of any governmental body, agency or court having 
              jurisdiction over the Company or any Subsidiary, and no 
              consent, approval, authorization or order of, or qualification 
              with, any governmental body or agency is required for the 
              performance by the Company of its obligations under this 
              Agreement, except such as may be required by the securities or 
              Blue Sky laws of the various states in connection with the 
              offer and sale of the Shares by the U.S. Underwriters;


                                       12

<PAGE>

                                                                       


                   (ix)   the statements (A) in the Prospectus under the 
              captions "Risk Factors--Dependence on Strategic Relationships," 
              "Risk Factors--Government Regulation," "Risk Factors--Shares 
              Eligible For Future Sale," "Business--Strategic Relationships,"
              "Business--Government Regulation," "Certain Transactions," 
              "Description of Capital Stock," "Shares Eligible for Future 
              Sale" and "Underwriters" and (B) in the Registration Statement 
              in Items 14 and 15, in each case insofar as such statements 
              constitute summaries of the legal matters, documents or 
              proceedings referred to therein, fairly present the information 
              called for with respect to such legal matters, documents and 
              proceedings and fairly summarize the matters referred to 
              therein;

                   (x)    after due inquiry, such counsel does not know of any 
              legal or governmental proceedings pending or threatened to 
              which the Company or any of its Subsidiaries is a party or to 
              which any of the properties of the Company or any of its 
              Subsidiaries is subject that are required to be described in 
              the Registration Statement or the Prospectus and are not so 
              described or of any statutes, regulations, contracts or other 
              documents that are required to be described in the Registration 
              Statement or the Prospectus or to be filed as exhibits to the 
              Registration Statement that are not described or filed as 
              required;

                   (xi)   the Company is not and, after giving effect to the 
              offering and sale of the Shares and the application of the 
              proceeds thereof as described in the Prospectus, will not be an 
              "investment company" as such term is defined in the Investment 
              Company Act of 1940, as amended;

                   (xii)  to such counsel's knowledge:  (1) the Registration 
              Statement has become effective under the Securities Act; 
              (2) no stop order proceedings with respect to the Registration 
              Statement have been instituted or are pending or threatened 
              under the Securities Act and nothing has come to such counsel's 
              attention to lead it to believe that such proceedings are 
              contemplated; and (3) any required filing of the Prospectus and 
              any supplement thereto pursuant to Rule 424(b) under the 
              Securities Act has been made in the manner and within the time 
              period required by such Rule 424(b);

                   (xiii) except as described in the Prospectus, no shares of 
              Common Stock are required to be registered under the 
              Registration Statement and no person or entity has any right to 
              cause any shares of Common Stock to be registered under the 
              Registration Statement, pursuant to the Company's certificate 
              of incorporation or bylaws or, to such counsel's knowledge, any 
              agreement or other right, which rights have not been validly 
              waived;


                                       13

<PAGE>

                                                                       


                   (xiv)  based on a letter from the Nasdaq Stock Market, the 
              shares to be sold under this Agreement to the Underwriters are 
              duly authorized for quotation on the Nasdaq National Market; and

                   (xv)   such counsel (A) is of the opinion that the 
              Registration Statement and Prospectus (except for financial 
              statements and schedules and other financial data included 
              therein as to which such counsel need not express any opinion) 
              comply as to form in all material respects with the Securities 
              Act and the applicable rules and regulations of the Commission 
              thereunder, (B) has no reason to believe that (except for 
              financial statements and schedules and other financial data as 
              to which such counsel need not express any belief) the 
              Registration Statement and the prospectus included therein at 
              the time the Registration Statement became effective contained 
              any untrue statement of a material fact or omitted to state a 
              material fact required to be stated therein or necessary to 
              make the statements therein not misleading and (C) has no 
              reason to believe that (except for financial statements and 
              schedules and other financial data as to which such counsel 
              need not express any belief) the Prospectus, as of its date or 
              the Closing Date, contains any untrue statement of a material 
              fact or omits to state a material fact necessary in order to 
              make the statements therein, in the light of the circumstances 
              under which they were made, not misleading.

              (d)    The Underwriters shall have received on the Closing Date an
       opinion of Fenwick & West LLP, counsel for the Underwriters, dated the
       Closing Date, covering the matters referred to in Sections 5(c)(vi),
       5(c)(vii), 5(c)(ix) (but only as to the statements in the Prospectus
       under "Description of Capital Stock" and "Underwriters") and 5(c)(xv)
       above. 

              With respect to Section 5(c)(xv) above, Wilson Sonsini Goodrich &
       Rosati and Fenwick & West LLP may state that their opinion and belief are
       based upon their participation in the preparation of the Registration
       Statement and Prospectus and any amendments or supplements thereto and
       review and discussion of the contents thereof, but are without
       independent check or verification, except as specified.

              The opinion of Wilson, Sonsini, Goodrich & Rosati described in
       Section 5(c) above shall be rendered to the Underwriters at the request
       of the Company and shall so state therein. 

              (e)    The Underwriters shall have received, on each of the date
       hereof and the Closing Date, a letter dated the date hereof or the
       Closing Date, as the case may be, in form and substance satisfactory to
       the Underwriters, from Ernst & Young LLP and with respect to the
       Financial Statements and certain financial information with respect to
       Actamed, Deloitte & Touche LLP, independent public accountants,
       containing statements and information of the type ordinarily included in
       accountants' "comfort letters" to 


                                       14

<PAGE>

                                                                       


       underwriters with respect to the financial statements and certain 
       financial information contained in the Registration Statement and the 
       Prospectus; PROVIDED that the letter delivered on the Closing Date 
       shall use a "cut-off date" not earlier than the date hereof. 

              (f)    The "lock-up" agreements, each substantially in the form of
       Exhibit A hereto, between you and certain stockholders, officers and
       directors of the Company relating to sales and certain other dispositions
       of shares of Common Stock or certain other securities, delivered to you
       on or before the date hereof, shall be in full force and effect on the
       Closing Date. 

              (g)    The Shares shall have received approval for listing, upon
       official notice of issuance, on the Nasdaq National Market.

              All the agreements, opinions, certificates and letters mentioned
above or elsewhere in this Agreement shall be deemed in compliance with the
provisions hereof only if Fenwick & West LLP, counsel for the Underwriters,
shall be reasonably satisfied that they comply in form and scope.

              The several obligations of the U.S. Underwriters to purchase
Additional Shares hereunder are subject to the delivery to the U.S.
Representatives on the Option Closing Date of such documents as they may
reasonably request with respect to the good standing of the Company, the due
authorization and issuance of the Additional Shares and other matters related to
the issuance of the Additional Shares.

              6.     COVENANTS OF THE COMPANY.  In further consideration of the
agreements of the Underwriters herein contained, the Company covenants with each
Underwriter as follows:

              (a)    To furnish to you, without charge, nine (9) signed copies
       of the Registration Statement (including exhibits thereto) and for
       delivery to each other Underwriter a conformed copy of the Registration
       Statement (without exhibits thereto) and to furnish to you in New York
       City, without charge, prior to 10:00 a.m. New York City time on the
       business day next succeeding the date of this Agreement and during the
       period mentioned in Section 6(c) below, as many copies of the Prospectus
       and any supplements and amendments thereto or to the Registration
       Statement as you may reasonably request. 

              (b)    Before amending or supplementing the Registration Statement
       or the Prospectus, to furnish to you a copy of each such proposed
       amendment or supplement and not to file any such proposed amendment or
       supplement to which you reasonably object, and to file with the
       Commission within the applicable period specified in Rule 424(b) under
       the Securities Act any prospectus required to be filed pursuant to such
       Rule.

              (c)    If, during such period after the first date of the public
       offering of the Shares as in the opinion of counsel for the Underwriters
       the Prospectus is required by law 


                                       15

<PAGE>

                                                                       


       to be delivered in connection with sales by an Underwriter or dealer, 
       any event shall occur or condition exist as a result of which it is 
       necessary to amend or supplement the Prospectus in order to make the 
       statements therein, in the light of the circumstances when the 
       Prospectus is delivered to a purchaser, not misleading, or if, in the 
       opinion of counsel for the Underwriters, it is necessary to amend or 
       supplement the Prospectus to comply with applicable law, forthwith to 
       prepare, file with the Commission and furnish, at its own expense, to 
       the Underwriters and to the dealers (whose names and addresses you 
       will furnish to the Company) to which Shares may have been sold by you 
       on behalf of the Underwriters and to any other dealers upon request, 
       [as many copies as you may from, time to time reasonably request of] 
       either amendments or supplements to the Prospectus so that the 
       statements in the Prospectus as so amended or supplemented will not, 
       in the light of the circumstances when the Prospectus is delivered to 
       a purchaser, be misleading or so that the Prospectus, as amended or 
       supplemented, will comply with law. 

              (d)    To endeavor to qualify the Shares for offer and sale under
       the securities or Blue Sky laws of such jurisdictions as you shall
       reasonably request.

              (e)    To make generally available to the Company's security
       holders and to you as soon as practicable an earning statement covering
       the twelve-month period ending ________, 199_ that satisfies the
       provisions of Section 11(a) of the Securities Act and the rules and
       regulations of the Commission thereunder. 

              (f)    During a period of three years from the effective date of
       the Registration Statement, the Company will furnish to you copies of
       (i) all reports to its stockholders and (ii) all reports, financial
       statements and proxy or information statements filed by the Company with
       the Commission or any national securities exchange.

              (g)    The Company will apply the proceeds from the sale of the
       Shares as set forth under "Use of Proceeds" in the Prospectus.

              (h)    The Company will use its best efforts to obtain and
       maintain in effect the quotation of the Shares on the Nasdaq National
       Market and to maintain such inclusion for a period of three years after
       the date hereof or until such earlier date as the Shares shall be listed
       for regular trading privileges on another national securities exchange
       approved by you.

              (i)    The Company will comply with all registration, filing and
       reporting requirements of the Securities Exchange Act of 1934, as amended
       (the "EXCHANGE ACT"), which may from time to time be applicable to the
       Company.

              (j)    The Company will comply with all provisions of all
       undertakings contained in the Registration Statement.


                                       16

<PAGE>

                                                                       


              (k)    Prior to the Closing Date, the Company will not, directly
       or indirectly, issue any press release or other communication and will
       not hold any press conference with respect to the Company, or its
       financial condition, results of operations, business, properties, assets,
       or prospects or this offering, without your prior written consent.

              (l)    Whether or not the transactions contemplated in this
       Agreement are consummated or this Agreement is terminated, to pay or
       cause to be paid all expenses incident to the performance of its
       obligations under this Agreement, including:  (i) the fees, disbursements
       and expenses of the Company's counsel and the Company's accountants in
       connection with the registration and delivery of the Shares under the
       Securities Act and all other fees or expenses in connection with the
       preparation and filing of the Registration Statement, any preliminary
       prospectus, the Prospectus and amendments and supplements to any of the
       foregoing, including all printing costs associated therewith, and the
       mailing and delivering of copies thereof to the Underwriters and dealers,
       in the quantities hereinabove specified, (ii) all costs and expenses
       related to the transfer and delivery of the Shares to the Underwriters,
       including any transfer or other taxes payable thereon, (iii) the cost of
       printing or producing any Blue Sky or Legal Investment memorandum in
       connection with the offer and sale of the Shares under state securities
       laws and all expenses in connection with the qualification of the Shares
       for offer and sale under state securities laws as provided in Section
       6(d) hereof, including filing fees and the reasonable fees and
       disbursements of counsel for the Underwriters in connection with such
       qualification and in connection with the Blue Sky or Legal Investment
       memorandum, (iv) all filing fees and the reasonable fees and
       disbursements of counsel to the Underwriters incurred in connection with
       the review and qualification of the offering of the Shares by the
       National Association of Securities Dealers, Inc., (v) all fees and
       expenses in connection with the preparation and filing of the
       registration statement on Form 8-A relating to the Common Stock and all
       costs and expenses incident to listing the Shares on the Nasdaq National
       Market, (vi) the cost of printing certificates representing the Shares,
       (vii) the costs and charges of any transfer agent, registrar or
       depositary, (viii) the costs and expenses of the Company relating to
       investor presentations on any "road show" undertaken in connection with
       the marketing of the offering of the Shares, including, without
       limitation, expenses associated with the production of road show slides
       and graphics, fees and expenses of any consultants engaged in connection
       with the road show presentations with the prior approval of the Company,
       travel and lodging expenses of the representatives and officers of the
       Company and any such consultants, and the cost of any aircraft chartered
       or limousines hired in connection with the road show, (ix) all expenses
       in connection with any offer and sale of the Shares outside of the United
       States, including filing fees and the reasonable fees and disbursements
       of counsel for the Underwriters in connection with offers and sales
       outside of the United States, (x) all fees and disbursements of counsel
       incurred by the Underwriters in connection with the Directed Share
       Program and stamp duties, similar taxes or duties or other taxes, if any,
       incurred by the Underwriters in connection with the 


                                       17

<PAGE>

                                                                       


       Directed Share Program, and (xi) all other costs and expenses incident 
       to the performance of the obligations of the Company hereunder for 
       which provision is not otherwise made in this Section.  It is 
       understood, however, that except as provided in this Section, Section 
       7 entitled "Indemnity and Contribution", and the last paragraph of 
       Section 9 below, the Underwriters will pay all of their costs and 
       expenses, including fees and disbursements of their counsel, stock 
       transfer taxes payable on resale of any of the Shares by them and any 
       advertising expenses connected with any offers they may make.

              (m)    That in connection with the Directed Share Program, the
       Company will ensure that the Directed Shares will be restricted to the
       extent required by the NASD or the NASD rules from sale, transfer,
       assignment, pledge or hypothecation for a period of three months
       following the date of the effectiveness of the Registration Statement. 
       Morgan Stanley will notify the Company as to which Participants are
       required to be so restricted.  The Company will direct the transfer agent
       to place stop transfer restrictions upon such securities for such period
       of time.

              (n)    That the Company will comply with all applicable securities
       and other applicable laws, rules and regulations in each foreign
       jurisdiction in which the Directed Shares are offered in connection with
       the  Directed Share Program.

              7.     INDEMNITY AND CONTRIBUTION.  

                     (a)    The Company agrees to indemnify and hold harmless
       each Underwriter and each person, if any, who controls any Underwriter
       within the meaning of either Section 15 of the Securities Act or Section
       20 of the Exchange Act, from and against any and all losses, claims,
       damages and liabilities (including, without limitation, any legal or
       other expenses reasonably incurred in connection with defending or
       investigating any such action or claim) caused by any untrue statement or
       alleged untrue statement of a material fact contained in the Registration
       Statement or any amendment thereof, any preliminary prospectus or the
       Prospectus (as amended or supplemented if the Company shall have
       furnished any amendments or supplements thereto), or caused by any
       omission or alleged omission to state therein a material fact required to
       be stated therein or necessary to make the statements therein not
       misleading, except insofar as such losses, claims, damages or liabilities
       are caused by any such untrue statement or omission or alleged untrue
       statement or omission based upon information relating to any Underwriter
       furnished to the Company in writing by such Underwriter through you
       expressly for use therein; provided, however that the foregoing indemnity
       with respect to any preliminary prospectus shall not inure to the benefit
       of any Underwriter from whom the person asserting any such losses,
       claims, damages or liabilities purchased Shares, or any person
       controlling such Underwriter, if a copy of the Prospectus (as then
       amended or supplemented if the Company shall have furnished any
       amendments or supplements thereto) was not sent or given by or on behalf
       of such Underwriter to such person, if required by law so to have been
       delivered, at or prior to the written confirmation of the 


                                       18

<PAGE>

                                                                       


       sale of the Shares to such person, and if the Prospectus (as so 
       amended or supplemented) would have cured the defect giving rise to 
       such losses, claims, damages or liabilities unless such failure is the 
       result of noncompliance by the Company, with Sections 6(a) or 6(c) 
       hereof.

                     (b)    The Company agrees to indemnify and hold harmless
       Morgan Stanley and each person, if any, who controls Morgan Stanley
       within the meaning of either Section 15 of the Securities Act or Section
       20 of the Exchange Act ("MORGAN STANLEY ENTITIES"), from and against any
       and all losses, claims, damages and liabilities (including, without
       limitation, any legal or other expenses reasonably incurred in connection
       with defending or investigating any such action or claim) (i) caused by
       any untrue statement or alleged untrue statement of a material fact
       contained in the prospectus wrapper material prepared by or with the
       consent of the Company for distribution in foreign jurisdictions in
       connection with the Directed Share Program attached to the Prospectus or
       any preliminary prospectus, or caused by any omission or alleged omission
       to state therein a material fact required to be stated therein or
       necessary to make the statement therein, when considered in conjunction
       with the Prospectus or any applicable preliminary prospectus, not
       misleading; (ii) caused by the failure of any Participant to pay for and
       accept delivery of the shares which, immediately following the
       effectiveness of the Registration Statement, were subject to a properly
       confirmed agreement to purchase; or (iii) related to, arising out of, or
       in connection with the Directed Share Program, provided that, the Company
       shall not be responsible under this subparagraph (iii) for any losses,
       claim, damages or liabilities (or expenses relating thereto) that are
       finally judicially determined to have resulted from the bad faith or
       gross negligence of Underwriter Entities.

                     (c)    Each Underwriter agrees, severally and not jointly,
       to indemnify and hold harmless the Company, its directors, its officers
       who sign the Registration Statement and each person, if any, who controls
       the Company within the meaning of either Section 15 of the Securities Act
       or Section 20 of the Exchange Act to the same extent as the foregoing
       indemnity from the Company to such Underwriter, but only with reference
       to information relating to such Underwriter furnished to the Company in
       writing by such Underwriter through you expressly for use in the
       Registration Statement, any preliminary prospectus, the Prospectus or any
       amendments or supplements thereto. 

                     (d)    In case any proceeding (including any governmental
       investigation) shall be instituted involving any person in respect of
       which indemnity may be sought pursuant to Section 7(a), 7(b) or 7(c),
       such person (the "INDEMNIFIED PARTY") shall promptly notify the person
       against whom such indemnity may be sought (the "INDEMNIFYING PARTY") in
       writing and the indemnifying party, upon request of the indemnified
       party, shall retain counsel reasonably satisfactory to the indemnified
       party to represent the indemnified party and any others the indemnifying
       party may designate in such proceeding and shall pay the reasonable fees
       and disbursements of such counsel 


                                       19

<PAGE>

                                                                       


       related to such proceeding.  In any such proceeding, any indemnified 
       party shall have the right to retain its own counsel, but the fees and 
       expenses of such counsel shall be at the expense of such indemnified 
       party unless (i) the indemnifying party and the indemnified party 
       shall have mutually agreed to the retention of such counsel or (ii) 
       the named parties to any such proceeding (including any impleaded 
       parties) include both the indemnifying party and the indemnified party 
       and representation of both parties by the same counsel would be 
       inappropriate due to actual or potential differing interests between 
       them.  It is understood that the indemnifying party shall not, in 
       respect of the legal expenses of any indemnified party in connection 
       with any proceeding or related proceedings in the same jurisdiction, 
       be liable for the fees and expenses of more than one separate firm (in 
       addition to any local counsel) for all such indemnified parties and 
       that all such fees and expenses shall be reimbursed as they are 
       incurred.  Such firm shall be designated in writing by Morgan Stanley, 
       in the case of parties indemnified pursuant to Section 7(a) or 7(b), 
       and by the Company, in the case of parties indemnified pursuant to 
       Section 7(c).  The indemnifying party shall not be liable for any 
       settlement of any proceeding effected without its written consent, but 
       if settled with such consent or if there be a final judgment for the 
       plaintiff, the indemnifying party agrees to indemnify the indemnified 
       party from and against any loss or liability by reason of such 
       settlement or judgment. Notwithstanding the foregoing sentence, if at 
       any time an indemnified party shall have requested an indemnifying 
       party to reimburse the indemnified party for fees and expenses of 
       counsel as contemplated by the second and third sentences of this 
       paragraph, the indemnifying party agrees that it shall be liable for 
       any settlement of any proceeding effected without its written consent 
       if (i) such settlement is entered into more than 30 days after receipt 
       by such indemnifying party of the aforesaid request and (ii) such 
       indemnifying party shall not have reimbursed the indemnified party in 
       accordance with such request prior to the date of such settlement.   
       No indemnifying party shall, without the prior written consent of the 
       indemnified party, effect any settlement of any pending or threatened 
       proceeding in respect of which any indemnified party is or could have 
       been a party and indemnity could have been sought hereunder by such 
       indemnified party, unless such settlement includes an unconditional 
       release of such indemnified party from all liability on claims that 
       are the subject matter of such proceeding.  Notwithstanding anything 
       contained herein to the contrary, if indemnity may be sought pursuant 
       to Section 7(b) hereof in respect of such action or proceeding, then 
       in addition to such separate firm for the indemnified parties, the 
       indemnifying party shall be liable for the reasonable fees and 
       expenses of not more than one separate firm (in addition to any local 
       counsel) for Morgan Stanley for the defense of any losses, claims, 
       damages and liabilities arising out of the Directed Share Program, and 
       all persons, if any, who control Morgan Stanley within the meaning of 
       either Section 15 of the Act or Section 20 of the Exchange Act.

                     (e)    To the extent the indemnification provided for in
       Section 7(a), 7(b) or 7(c) is unavailable to an indemnified party or
       insufficient in respect of any losses, claims, damages or liabilities
       referred to therein, then each indemnifying party under such 


                                       20

<PAGE>

                                                                       


       paragraph, in lieu of indemnifying such indemnified party thereunder, 
       shall contribute to the amount paid or payable by such indemnified 
       party as a result of such losses, claims, damages or liabilities (i) 
       in such proportion as is appropriate to reflect the relative benefits 
       received by the Company on the one hand and the Underwriters on the 
       other hand from the offering of the Shares or (ii) if the allocation 
       provided by clause 7(e)(i) above is not permitted by applicable law, 
       in such proportion as is appropriate to reflect not only the relative 
       benefits referred to in clause 7(e)(i) above but also the relative 
       fault of the Company on the one hand and of the Underwriters on the 
       other hand in connection with the statements or omissions that 
       resulted in such losses, claims, damages or liabilities, as well as 
       any other relevant equitable considerations.  The relative benefits 
       received by the Company on the one hand and the Underwriters on the 
       other hand in connection with the offering of the Shares shall be 
       deemed to be in the same respective proportions as the net proceeds 
       from the offering of the Shares (before deducting expenses) received 
       by the Company and the total underwriting discounts and commissions 
       received by the Underwriters, in each case as set forth in the table 
       on the cover of the Prospectus, bear to the aggregate Public Offering 
       Price of the Shares.  The relative fault of the Company on the one 
       hand and the Underwriters on the other hand shall be determined by 
       reference to, among other things, whether the untrue or alleged untrue 
       statement of a material fact or the omission or alleged omission to 
       state a material fact relates to information supplied by the Company 
       or by the Underwriters and the parties' relative intent, knowledge, 
       access to information and opportunity to correct or prevent such 
       statement or omission.  The Underwriters' respective obligations to 
       contribute pursuant to this Section 7 are several in proportion to the 
       respective number of Shares they have purchased hereunder, and not 
       joint. 

                     (f)    The Company and the Underwriters agree that it would
       not be just or equitable if contribution pursuant to this Section 7 were
       determined by PRO RATA allocation (even if the Underwriters were treated
       as one entity for such purpose) or by any other method of allocation that
       does not take account of the equitable considerations referred to in
       Section 7(e).  The amount paid or payable by an indemnified party as a
       result of the losses, claims, damages and liabilities referred to in the
       immediately preceding paragraph shall be deemed to include, subject to
       the limitations set forth above, any legal or other expenses reasonably
       incurred by such indemnified party in connection with investigating or
       defending any such action or claim.   Notwithstanding the provisions of
       this Section 7, no Underwriter shall be required to contribute any amount
       in excess of the amount by which the total price at which the Shares
       underwritten by it and distributed to the public were offered to the
       public exceeds the amount of any damages that such Underwriter has
       otherwise been required to pay by reason of such untrue or alleged untrue
       statement or omission or alleged omission.  No person guilty of
       fraudulent misrepresentation (within the meaning of Section 11(f) of the
       Securities Act) shall be entitled to contribution from any person who was
       not guilty of such fraudulent misrepresentation.  The remedies provided
       for in this Section 7 are not exclusive and 


                                       21

<PAGE>

                                                                       


       shall not limit any rights or remedies which may otherwise be available 
       to any indemnified party at law or in equity. 

                     (g)    The indemnity and contribution provisions contained
       in this Section 7 and the representations, warranties and other
       statements of the Company contained in this Agreement shall remain
       operative and in full force and effect regardless of (i) any termination
       of this Agreement, (ii) any investigation made by or on behalf of any
       Underwriter or any person controlling any Underwriter or by or on behalf
       of the Company, its officers or directors or any person controlling the
       Company and (iii) acceptance of and payment for any of the Shares. 

              8.     TERMINATION.  This Agreement shall be subject to
termination by notice given by you to the Company, if (a) after the execution
and delivery of this Agreement and prior to the Closing Date (i) trading
generally shall have been suspended or materially limited on or by, as the case
may be, any of the New York Stock Exchange, the American Stock Exchange, the
National Association of Securities Dealers, Inc., the Chicago Board of Options
Exchange, the Chicago Mercantile Exchange or the Chicago Board of Trade, (ii)
trading of any securities of the Company shall have been suspended on any
exchange or in any over-the-counter market, (iii) a general moratorium on
commercial banking activities in New York shall have been declared by either
Federal or New York State authorities or (iv) there shall have occurred any
outbreak or escalation of hostilities or any change in financial markets or any
calamity or crisis that, in your judgment, is material and adverse and (b) in
the case of any of the events specified in clauses 8(a)(i) through 8(a)(iv),
such event, singly or together with any other such event, makes it, in your
judgment, impracticable to market the Shares on the terms and in the manner
contemplated in the Prospectus. 

              9.     EFFECTIVENESS; DEFAULTING UNDERWRITERS.  This Agreement
shall become effective upon the execution and delivery hereof by the parties
hereto.

              If, on the Closing Date or the Option Closing Date, as the case
may be, any one or more of the Underwriters shall fail or refuse to purchase
Shares that it has or they have agreed to purchase hereunder on such date, and
the aggregate number of Shares which such defaulting Underwriter or Underwriters
agreed but failed or refused to purchase is not more than one-tenth of the
aggregate number of the Shares to be purchased on such date, the other
Underwriters shall be obligated severally in the proportions that the number of
Firm Shares set forth opposite their respective names in Schedule I or Schedule
II bears to the aggregate number of Firm Shares set forth opposite the names of
all such non-defaulting Underwriters, or in such other proportions as you may
specify, to purchase the Shares which such defaulting Underwriter or
Underwriters agreed but failed or refused to purchase on such date; PROVIDED
that in no event shall the number of Shares that any Underwriter has agreed to
purchase pursuant to this Agreement be increased pursuant to this Section 9 by
an amount in excess of one-ninth of such number of Shares without the written
consent of such Underwriter.  If, on the Closing Date, any Underwriter or
Underwriters shall fail or refuse to purchase Firm 


                                       22

<PAGE>

                                                                       


Shares and the aggregate number of Firm Shares with respect to which such 
default occurs is more than one-tenth of the aggregate number of Firm Shares 
to be purchased, and arrangements satisfactory to you and the Company for the 
purchase of such Firm Shares are not made within 36 hours after such default, 
this Agreement shall terminate without liability on the part of any 
non-defaulting Underwriter or the Company.  In any such case either you or 
the Company shall have the right to postpone the Closing Date, but in no 
event for longer than seven days, in order that the required changes, if any, 
in the Registration Statement and in the Prospectus or in any other documents 
or arrangements may be effected.  If, on the Option Closing Date, any 
Underwriter or Underwriters shall fail or refuse to purchase Additional 
Shares and the aggregate number of Additional Shares with respect to which 
such default occurs is more than one-tenth of the aggregate number of 
Additional Shares to be purchased, the non-defaulting Underwriters shall have 
the option to (i) terminate their obligation hereunder to purchase Additional 
Shares or (ii) purchase not less than the number of Additional Shares that 
such non-defaulting Underwriters would have been obligated to purchase in the 
absence of such default.  Any action taken under this paragraph shall not 
relieve any defaulting Underwriter from liability in respect of any default 
of such Underwriter under this Agreement. 

              If this Agreement shall be terminated by the Underwriters, or any
of them, because of any failure or refusal on the part of the Company to comply
with the terms or to fulfill any of the conditions of this Agreement, or if for
any reason the Company shall be unable to perform its obligations under this
Agreement, the Company will reimburse the Underwriters or such Underwriters as
have so terminated this Agreement with respect to themselves, severally, for all
out-of-pocket expenses (including the fees and disbursements of their counsel)
reasonably incurred by such Underwriters in connection with this Agreement or
the offering contemplated hereunder.

              10.    COUNTERPARTS.  This Agreement may be signed in two or more
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.

              11.    APPLICABLE LAW.  This Agreement shall be governed by and
construed in accordance with the internal laws of the State of New York.


                                       23

<PAGE>

                                                                       


              12.    HEADINGS.  The headings of the sections of this Agreement
have been inserted for convenience of reference only and shall not be deemed a
part of this Agreement.

                                          Very truly yours,
                                          HEALTHEON CORPORATION



                                          By:________________________________
                                             Name:
                                             Title:

Accepted as of the date hereof 

MORGAN STANLEY & CO. INCORPORATED
GOLDMAN, SACHS & CO.
HAMBRECHT & QUIST LLC
VOLPE BROWN WHELAN & COMPANY, LLC
Acting severally on behalf of themselves and the several U.S.
       Underwriters named in Schedule I hereto. 
By: Morgan Stanley & Co. Incorporated



By:___________________________
   Name:
   Title:

MORGAN STANLEY & CO. INTERNATIONAL LIMITED
GOLDMAN SACHS INTERNATIONAL
HAMBRECHT & QUIST LLC
VOLPE BROWN WHELAN & COMPANY, LLC
Acting severally on behalf of themselves and the several International
       Underwriters named in Schedule II hereto. 
By: Morgan Stanley & Co. International Limited 



By: ____________________________
    Name:
    Title:


                                       24

<PAGE>


                                                                     SCHEDULE I

                                 U.S. UNDERWRITERS


<TABLE>
<CAPTION>
                                                    Number of Firm
Underwriter                                      Shares To Be Purchased
- -----------                                      ----------------------
<S>                                              <C>

Morgan Stanley & Co. Incorporated
Goldman Sachs & Co.
Hambrecht & Quist LLC
Volpe Brown Whelan & Company, LLC
              
              
              
              
              
              
              
              
              
                                                 ----------------------
     Total U.S. Firm Shares: 
                                                 ----------------------
                                                 ----------------------

</TABLE>


<PAGE>

                                                                    SCHEDULE II

                             INTERNATIONAL UNDERWRITERS


<TABLE>
<CAPTION>
                                                     Number of Firm
Underwriter                                      Shares To Be Purchased
- -----------                                      ----------------------
<S>                                              <C>

Morgan Stanley & Co. International Limited
Goldman Sachs International
Hambrecht & Quist LLC
Volpe Brown Whelan & Company, LLC
              
              
              
              
              
              
              
              
              
              
                                                 ----------------------
       Total International Firm Shares:
                                                 ----------------------
                                                 ----------------------

</TABLE>

<PAGE>

COMMON STOCK                                                        COMMON STOCK

   NUMBER                                                               SHARES

HLT

                                   HEALTHEON

                                             SEE REVERSE FOR CERTAIN DEFINITIONS
                                              AND A STATEMENT AS TO THE RIGHTS,
INCORPORATED UNDER THE LAWS OF                   PREFERENCES, PRIVILEGES AND
  THE STATE OF DELAWARE                             RESTRICTIONS ON SHARES


                                                       CUSIP 422209 10 6

THIS CERTIFIES THAT



IS THE RECORD HOLDER OF

 FULLY PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK, $0.0001 PAR VALUE, OF

                            HEALTHEON CORPORATION

transferable on the books of the Corporation in person or by duly authorized 
attorney upon surrender of this Certificate properly endorsed. This 
Certificate is not valid unless countersigned and registered by the Transfer 
Agent and Registrar.

     WITNESS, the facsimile seal of the Corporation and the facsimile 
signatures of its duly authorized officers.

Dated:

 /s/ John L. Westermann III  [HEALTHEON CORPORATE     /s/ W. Michael Long
    SECRETARY                      SEAL]            CHIEF EXECUTIVE OFFICER

COUNTERSIGNED AND REGISTERED:
     AMERICAN STOCK TRANSFER & TRUST COMPANY
                         TRANSFER AGENT AND REGISTRAR

BY
                                   AUTHORIZED SIGNATURE


<PAGE>

     A statement of the powers, designations, preferences and relative, 
participating, optional or other special rights of each class of stock or 
series thereof and the qualifications, limitations or restrictions of such 
preferences and/or rights as established, from time to time, by the 
Certificate of Incorporation of the Corporation and by any certificate of 
designation, and the number of shares constituting each class and series and 
the designations thereof, may be obtained by the holder hereof upon request 
and without charge from the Corporation at its principal office.

     The following abbreviations, when used in the inscription on the face of 
this certificate, shall be construed as though they were written out in full 
according to applicable laws or regulations:


TEN COM -- as tenants in common
TEN ENT -- as tenants by the entireties
JT TEN  -- as joint tenants with right 
           of survivorship and not as 
           tenants in common

UNIF GIFT MIN ACT -- _______________ Custodian _______________
                         (Cust)                   (Minor)
                     under Uniform Gifts to Minors 
                     Act _____________________________________
                                      (State)

UNIF TRF MIN ACT  -- _______________ Custodian (until age_____)
                         (Cust)
                     ___________________under Uniform Transfers
                         ([ILLEGIBLE])
                     to Minors Act ___________________________
                                       (State)

    Additional abbreviations may also be used though not in the above list.


FOR VALUE RECEIVED, ______________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE
- --------------------------------------

- --------------------------------------


________________________________________________________________________________
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

________________________________________________________________________________

________________________________________________________________________________

__________________________________________________________________________Shares
of the common stock represented by the within Certificate, and do hereby 
irrevocably constitute and appoint

________________________________________________________________________Attorney
to transfer the said stock on the books of the within named Corporation 
with full power of substitution in the premises.

Dated ___________________     

                              __________________________________________________
                      NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND 
                              WITH THE NAME AS WRITTEN UPON THE FACE OF THE 
                              CERTIFICATE, IN EVERY PARTICULAR, WITHOUT 
                              ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

Signature(s) Guaranteed

By _______________________________________________________
THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION 
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS 
WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM) 
PURSUANT TO [THE REST OF THIS IS ILLEGIBLE].




<PAGE>
                                                                     EXHIBIT 5.1
 
   
                                October 16, 1998
    
 
Healtheon Corporation
4600 Patrick Henry Drive
Santa Clara, CA 95054
 
    RE: Registration Statement on Form S-1
 
Ladies and Gentlemen:
 
   
    We have examined the Registration Statement on Form S-1 filed by you with
the Securities and Exchange Commission on July 31, 1998 (Registration No.
333-60427), as amended (the "Registration Statement"), in connection with the
registration under the Securities Act of 1933, as amended, of up to 10,718,036
shares of your Common Stock (the "Shares"), including an over-allotment option
granted to the underwriters of the offering to purchase up to 978,750 shares. We
understand that you are selling the Shares to the underwriters for resale to the
public and directly to one investor as described in the Registration Statement.
As your legal counsel, we have examined the proceedings taken, and are familiar
with the proceedings proposed to be taken, by you in connection with the sale
and issuance of the Shares.
    
 
    It is our opinion that, upon completion of the proceedings being taken or
proposed to be taken by us, as your legal counsel, prior to the issuance of the
Shares, the Shares will be legally issued, fully paid and non-assessable when
sold in the manner described in the Registration Statement.
 
    We are members of the Bar of the State of California only and express no
opinion as to any matter relating to the laws of any jurisdiction other than the
laws of the State of California and the federal laws of the United States.
Without limiting the foregoing, we express no opinion as to the securities laws
of the State of Delaware.
 
    We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement, including the Prospectus constituting a part thereof,
and any amendments thereto.
 
                                          Very truly yours,
 
                                          WILSON SONSINI GOODRICH & ROSATI
                                          Professional Corporation
 
                                          /s/ Wilson Sonsini Goodrich & Rosati,
                                          P.C.
                                          --------------------------------------

<PAGE>
                                                                 EXHIBIT 10.13

CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                         Services and License Agreement
                          Between ActaMed Corporation
                       and United HealthCare Corporation


       This Services and License Agreement (the "Agreement") is made and 
entered into as of April 4, 1996 (the "Effective Date"), by and between 
ActaMed Corporation ("ActaMed") and United HealthCare Corporation ("UHC"), 
for itself and on behalf of each of the Managed Plans which has given its 
written consent (as hereinafter defined).
                                       
                                   RECITALS

       A.      ActaMed is in the business of providing electronic data 
interchange products and services to the health care industry.

       B.      UHC, for itself on and behalf of its Affiliates (including The 
MetraHealth Companies, Inc.), and other entities that UHC may hereafter 
acquire, and on behalf of the health maintenance organizations identified in 
Exhibit A hereto that are managed by UHC or an Affiliate thereof and which 
have given their consent to be bound by this Agreement (which plans which 
give their consent are referred to herein as the "Managed Plans"), desires to 
obtain from ActaMed certain software and materials and access to the Network, 
on the terms and conditions set forth below.

       NOW, THEREFORE, in consideration of the premises and the mutual 
promises contained herein, the parties agree as follows.

       1.      DEFINITIONS.

       1.1     "Affiliate" means with respect to a party, an entity directly 
or indirectly controlling, controlled by or under common control with such 
party where control means the ownership or control, directly or indirectly, 
of more than fifty percent of all of the voting power of the shares (or other 
securities or rights) entitled to vote for the election of directors or other 
governing authority, as of the Effective Date or hereafter during the term of 
this Agreement; provided that such entity shall be considered an Affiliate 
only for the time during which such control exists.  The Managed Plans shall 
be considered to be Affiliates of UHC.

       1.2     "Cosmos" means the computer program owned by UHC which is 
commonly known as Cosmos, and which UHC operates for health care claims 
adjudication and other business functions.


                                      1
<PAGE>

       1.3     "Enhancements" means changes or additions to application 
software and documentation that improve existing Functions, add new 
Functions, or improve performance through changes in the system design or 
coding.

       1.4     "Functions" means the tasks employed by users to exchange 
information within the Network.

       1.5     "Licensed Materials" shall mean the Network Software, the 
ORBIT software (i.e., the ProviderLink billing and registration system), and 
the documentation, training materials, and other materials related to the 
Network Software or the Network which are listed on Exhibit B attached to 
this Agreement.  All updates and new versions of such materials are also 
included in the definition of "Licensed Materials".

       1.6     "Network" means the electronic data interchange ("EDI") system 
and network operated by ActaMed, which includes the Network Software, 
including any future versions of the EDI network or products substituting for 
it which include the basic functionality of the Network Software and network 
as of the Effective Date, regardless of the name under which it is marketed.  
The term "Network" specifically excludes any telecommunications network.

       1.7     "Network Software" means the personal computer version of the 
ProviderLink and ActaLink presentation and network software programs, and all 
updates to them, which are licensed to users and which allow access to the 
Network for the transmission and reception of information.

       1.8     "Provider" means a provider of health care services, which is 
not UHC, an Affiliate of UHC, or operated by UHC.

       1.9     "UHC" means United HealthCare Corporation and its Affiliates.

       2.      LICENSE AND NETWORK ACCESS.

       2.1     ActaMed grants UHC the nonexclusive, nontransferable right to 
use the Licensed Materials, to reproduce and modify those of the Licensed 
Materials so designated on Exhibit B, and to access and utilize the services 
of the Network, for UHC's internal use, on the terms set forth in this 
Agreement. UHC's internal use shall include use by and/or on behalf of (a) 
UHC or any UHC Affiliate; and (b) third parties that are purchasers of UHC's 
products and/or services, including management services, as well as UHC's 
health care service providers (including, without limitation, NYH Health Plan 
Services, Inc. ("NYHHPS") and its subsidiaries and/or affiliates pursuant to 
the First Restated Administrative Services Agreement between UHC and NYHHPS, 
dated September 1, 1994, as amended from time to time).  UHC's access to use 
the Network will be on the same operational basis which ActaMed offers the 
Network to its other customers of the Network, except as otherwise provided 
in this Agreement.


                                      2
<PAGE>

       2.2     UHC shall submit all permitted modifications it makes to the 
Licensed Materials for ActaMed's approval, prior to distributing the 
modifications.  If ActaMed does not respond to UHC within fourteen days after 
UHC submits modifications to ActaMed for approval, the modifications shall be 
deemed approved.  On the copies of the Licensed Materials UHC makes, UHC 
shall reproduce all notices or legends appearing on the original copy, 
including the copyright notice.  All copies of the Licensed Materials made by 
UHC can be used only as permitted under this Agreement.  At any time within 
ten days after ActaMed's written request, UHC shall inform ActaMed of the 
number and location of all copies of the Licensed Materials UHC has made.

       2.3     UHC shall have the right to install the Network Software at 
any UHC location and at any locations of Providers working with UHC, and to 
connect such locations to the Network.  ActaMed will install the Network 
Software at UHC or Provider sites and connect them to the Network, when 
mutually agreed by the parties.  UHC and ActaMed will do agreed upon 
installations in a timely manner. UHC and ActaMed must continue to use the 
installation procedures developed by UHC or other mutually agreeable 
installation procedures (except as provided in any agreements directly 
between ActaMed and a UHC health plan, such as UHC Georgia) for such sites.  
UHC shall not be obligated under paragraph 12.1 to pay a monthly site fee or 
transaction fees for any Provider connected to the Network by ActaMed, unless 
UHC has agreed to be responsible for such Provider and fees.

       2.4     Any development work on the Licensed Materials or the Network 
which was in progress on the date of this Agreement, will be provided to UHC 
upon completion and included within the definition of "Licensed Materials", 
at no charge to UHC, if it is set forth on Exhibit C attached to this 
Agreement.

       2.5     UHC shall not act as a clearinghouse for health care claims 
going to payors other than UHC, other than as required by a UHC client, such 
as UBS misdirected Railroad Retirement claims and Medicare cross-over claims.

       2.6     If UHC desires to and ActaMed agrees that UHC may use and 
implement the Licensed Materials or the Network technology outside North 
America, UHC and ActaMed shall mutually agree upon the terms and conditions 
of such use and implementation.

       2.7     Except as otherwise provided in this Agreement, ActaMed 
provides the Licensed Materials to UHC on an "AS IS, WHERE IS" basis.  
ACTAMED EXPRESSLY DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, RELATING TO 
THE LICENSED MATERIALS, INCLUDING, BUT NOT LIMITED TO, THE WARRANTIES OF 
TITLE, NONINFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
OR USE.

       2.8     Except as otherwise provided in this Agreement, UHC shall not 
(a) copy, reproduce, modify, or excerpt any of the Licensed Materials for any 
purpose; (b) distribute, 


                                      3
<PAGE>

rent, sublicense, share, transfer or lease the Licensed Materials or access 
to the Network, to any person or entity which is not a party to this 
Agreement; or (c) attempt to reverse engineer or otherwise obtain copies of 
the source code for the Licensed Materials.

       2.9     UHC acknowledges that the Licensed Materials may contain 
embedded runtime modules of products licensed to ActaMed by Sybase, Inc. 
("Sybase") and, accordingly, that Sybase as an interested third party 
beneficiary of this Agreement, may enforce this Agreement directly against 
UHC and shall have no liability to UHC.  In addition, UHC agrees that Sybase 
shall have the right to direct a recognized independent accounting firm to 
conduct, during normal business hours, an audit of appropriate records of UHC 
to verify (a) the number of copies of the Licensed Materials in use by UHC, 
and the computer systems on which such copies are installed, the number of 
processors in such computer systems, and the number of users using such 
copies; and (b) UHC's compliance with this Agreement.  Representatives of the 
auditing firm shall protect the confidentiality of UHC's confidential 
information and abide by UHC's reasonable security regulations while on UHC's 
premises.

       2.10    ActaMed agrees that ActaMed does not own and cannot use, 
distribute or publish any data transmitted over the Network either to or from 
UHC, except to the extent such data originates with ActaMed.  Notwithstanding 
the above, ActaMed shall have the right to collect and distribute data 
transmitted over the Network back to the originator of such data.

       3.      MARKETING AND IMPLEMENTATION OF NETWORK PRODUCTS.

       3.1     UHC will identify the business needs, goals and objectives of 
UHC for ActaMed, and will establish targets for the number and volume of 
Providers submitting electronic transactions.  These numbers will be 
estimates, and not guarantees, for any amount of business for ActaMed.  UHC 
will provide this information to ActaMed no less often than quarterly, and 
shall respond to additional requests for information within thirty days of 
ActaMed's request. The parties shall mutually agree upon any other 
information or data which UHC may give to ActaMed under this Agreement.

       3.2     ActaMed will appoint at least one representative dedicated to 
the UHC account, who will have decision making capabilities for ActaMed.  
This person will attend planning meetings with UHC, keep UHC updated on 
national trends in EDI, and consult with UHC regarding ActaMed's software and 
network strategy.  ActaMed will provide a representative to WEDI and ANSI to 
represent UHC, upon UHC's request.  UHC shall also designate a representative 
to work with ActaMed and to coordinate UHC's activities with ActaMed, who 
will have decision making capabilities for UHC.  This person will attend 
planning meetings with ActaMed, keep ActaMed updated on technical 
developments with respect to Cosmos, and coordinate UHC's activities with 
ActaMed.  J.R. Hughes will be the initial representative for ActaMed and Joy 
Bahnemann will be the initial representative for UHC.  Each party will 
consult with the other before changing its designated representative.


                                      4
<PAGE>

       3.3     Exhibit D to this Agreement specifies the reports UHC will 
deliver to ActaMed and ActaMed will deliver to UHC daily, weekly, monthly, 
quarterly and annually.  The parties shall also provide ad hoc reports to 
each other at no cost to the requesting party.

       3.4     ActaMed will submit to UHC for its input and comments a 
comprehensive disaster recovery plan and documentation within 90 days after 
the date of this Agreement.  The plan shall include testing of the plan no 
less often than annually and agreed upon time constraints within which full 
recovery will be expected.  ActaMed will accept comments from UHC and make 
reasonable commercial efforts within the context of the Network to 
incorporate such comments.  ActaMed will use its best efforts to establish a 
hot site under its disaster recovery plan which is not at a UHC data center 
within one year after the date of this Agreement.  ActaMed will submit 
amended disaster recovery plans to UHC, for its information and input, any 
time that ActaMed makes substantial changes to its plan.  ActaMed will 
participate in UHC's annual test of the UHC disaster recovery plan, with up 
to forty hours of ActaMed personnel time at no cost to UHC.  For any 
additional time beyond the forty hours which UHC requests from ActaMed for 
this purpose, UHC will pay ActaMed an agreed upon price.

       3.5     ActaMed will establish a user group, to consult on priorities 
and provide direction to ActaMed on system initiatives, which will include 
representation from UHC, Providers and payors.  ActaMed will solicit user 
suggestions, input and feedback regarding the Network.  ActaMed will provide 
to UHC copies of customer satisfaction surveys and other similar information 
regarding use of the Network at sites for which UHC is paying the monthly 
site fee or any transaction fees.

       3.6     UHC will make its sales and Provider relations personnel 
available to work with ActaMed to develop new sites for use of the Network by 
Providers working with UHC, to the same extent that such personnel work with 
UHC's EDI Services to develop new sites as of the Effective Date.  Pursuant 
to paragraph 12.2, UHC shall have the option of performing installations and 
implementations of the Network software itself, rather than contracting for 
them through ActaMed.  In such circumstances where UHC has decided not to 
out-source such functions to ActaMed, UHC will continue to use health plan 
ProviderLink representatives to install and implement the Network for new and 
existing UHC-sponsored sites.  UHC will also continue to use health plan 
ProviderLink representatives to train and provide technical support to the 
extent required under Exhibit F and section 8.

       3.7     UHC shall sponsor a reasonable number of reference inquiries 
and visits (not to exceed two visits in any calendar month) by customers and 
potential customers of the Network, pursuant to ActaMed's Showcase Program, 
on mutually agreeable terms.  UHC shall retain the right to reasonably refuse 
a site visit to any competitor or potential competitor of UHC, and ActaMed 
shall inform all customers and potential customers allowed on UHC's premises 
under this paragraph 3.7 that they are required to abide by 


                                      5
<PAGE>

UHC's security procedures and policies.

       4.      ACTAMED'S OBLIGATIONS REGARDING, NETWORK PRODUCT LINE.

       4.1     ActaMed will, during the term of this Agreement, continue 
maintaining the Licensed Materials and the Network, or other ActaMed products 
which provide, at a minimum, substantially the same functionality as provided 
by the Licensed Materials and the Network, on the Effective Date.

       4.2     ActaMed will update the licensed Materials and the Network 
with changes mandated by state or federal law and other changes required in 
the reasonable opinion of the parties to meet market expectations for EDI, 
including the ANSI X12N standard.  The parties will mutually agree upon any 
additional standards which ActaMed will need to maintain.  If the changes 
mandated by this paragraph apply to substantially all of ActaMed's customers, 
then ActaMed will make such changes as part of a release of the Network or 
the Licensed Materials pursuant to paragraph 8.1 or paragraph 8.2.

       4.3     Subject to section 9, both parties will continue to work with 
practice management system vendors to develop interfaces between practice 
management programs and the Network, in order to be able to market the 
Network to Providers.  UHC will assist ActaMed in its attempts to establish 
relationships with and work with practice management system vendors.

       4.4     ActaMed will work with and cooperate with Allina and UHC to 
formulate a plan allowing Allina to use the Network to operate its LaborLink 
product, at UHC's request.

       4.5     ActaMed will be responsible for notifying all Providers, 
practice management vendors and other entities which are signatories to 
Network agreements to be assigned by UHC to EDI Services, Inc. that the 
assignee will be merged with and into ActaMed.  UHC shall have the right to 
review and approve the notice prior to ActaMed sending it to any Providers or 
other signatories.

       4.6     ActaMed shall place a copy of the source code, object code and 
technical documentation for all software used in the operation of the Network 
in escrow, including the Network Software, for the benefit of UHC, pursuant 
to the escrow agreement attached to this Agreement as Exhibit E (the "Escrow 
Agreement").  ActaMed shall cause UHC to be listed as a "Licensee" under the 
Escrow Agreement and shall cause the Licensed Materials and all operational 
computer software and documentation ActaMed uses to operate the Network to be 
listed as a "System" under the Escrow Agreement, as soon as practical after 
the Effective Date.  In the event ActaMed ceases operating the Network for 
any reason defined in such Escrow Agreement during the duration of this 
Agreement, ActaMed shall deliver to UHC, for UHC's nonexclusive use, one 
then-current copy of all operational computer software and documentation 
ActaMed uses to operate the Network.


                                      6
<PAGE>

       5.      UIHC'S OBLIGATIONS REGARDING THE NETWORK.

       5.1     UHC shall generate or receive transaction data in the standard 
format and the protocol set forth in such format which is in use as of the 
Effective Date, or as otherwise mutually agreed upon by the parties.  In the 
event that ActaMed changes such format, UHC shall provide ActaMed with 
standard output and test messages for ActaMed's use.

       5.2     UIHC shall provide, at its own expense, all necessary 
hardware, including terminal equipment, compatible with and suitable for its 
communications with the Network.  UIHC shall prepare the proper operating 
environment as described in Exhibit J attached to this Agreement.  ActaMed 
shall verify UHC's operating environment with the testing procedure 
established by ActaMed and agreed to by UHC.

       6.      ACCESS TO COSMOS AND OTHER PROPRIETARY UHC SOFTWARE.

       6.1     ActaMed will not have access to Cosmos or any other UHC 
proprietary systems, and will have no right to modify the computer code in 
Cosmos, except as mutually agreed by the parties in writing.  ActaMed will 
not receive any part of the Cosmos code, except as mutually agreed by the 
parties in writing.  The Network will deliver claims and information to 
Cosmos, and UHC is solely responsible for the operation of Cosmos.

       6.2     UHC produces new releases of Cosmos four to five times each 
year, and new releases of other UHC host computer systems (including host 
computer systems operated by third party out-sources on behalf of UHC), from 
time to time.  UHC will give ActaMed notice of such changes and information 
regarding them, and, if the changes require any modifications to the Network 
or the Licensed Materials, the parties will mutually agree on the scope of 
the project, the deliverables, deadlines, any fees ActaMed will charge UHC, a 
test plan and an acceptance test plan.

       6.3     If, at any point, UHC agrees that ActaMed needs access to any 
other proprietary UHC software or systems, the parties shall negotiate a 
limited license allowing ActaMed such access to be used only for UHC's 
benefit.

       6.4     ActaMed agrees that UHC shall be the sole and exclusive owner 
of any and all changes ActaMed makes to the code in Cosmos or any other 
computer system proprietary to UHC.  ActaMed agrees to assign and hereby 
assigns and transfers to UHC any and all rights which ActaMed may have in 
such code, including any copyright, patent, trademark, trade secret and other 
intellectual property rights.  ActaMed will cooperate with UHC and will 
execute any documentation reasonably required by UHC to assert or protect its 
property rights in such code.

       7.      DEVELOPMENT OF NEW FUNCTIONALITY.

       7.1     When ActaMed develops new functionality for the Network that
ActaMed 


                                      7
<PAGE>

offers generally to its customers, which is not included in a maintenance 
release that ActaMed offers generally to its customers pursuant to paragraph 
8.1, [*]

       7.2     When UHC specifically requests development work from ActaMed, 
for UHC's own use, the parties will negotiate a price at the time such work 
is requested.  If ActaMed will be permitted to use this custom work for other 
customers, the price UHC pays ActaMed for such work [*] that [*] and [*]

       7.3     When ActaMed performs development work on the Network at the 
request of another customer, [*] to [*] at [*] for the [*] as long as 
ActaMed has the legal right to [*] and such [*] is [*].

       7.4     If, at any time, UHC chooses to contract with ActaMed for a 
dedicated services team from ActaMed to handle development of new 
functionality and other changes to the Network, the Licensed Materials, or 
UHC's proprietary systems which are not covered under maintenance, ActaMed 
will provide the dedicated team on mutually agreeable terms and conditions.

       8.      ACTAMED'S MAINTENANCE AND SUPPORT OBLIGATIONS.

       8.1     ActaMed's maintenance releases for the Network and the 
Licensed Materials shall be denoted by a three digit number where the first 
number is the version number, the second number is the level number, and the 
third number (if it is greater than 1) is the build number.  For example, 
release 2.1.2 is a maintenance release for the version 2.1.1 software.  
ActaMed will provide new maintenance releases at no charge to all its Network 
maintenance customers, including, without limitation, UHC.

       8.2     The price UHC will pay ActaMed under paragraph 12.1 for 
ActaMed's maintenance services under this Agreement does not include 
Enhancements to the Network Software, such as new Functions, significant 
redesigns or improvements of current Functions, or significant advances in 
system performance. Enhancements are contained in Actamed's new versions 
which are denoted by a three digit number, the first digit of which is the 
version number, the second digit of which is a level number, and the third 
digit of which is 1.  For example, version 2.1.1 is followed by new version 
numbers 2.2.1, 2.3.1, 2.4.1, 3.0.1, etc.  ActaMed will make new versions of 
the Network Software available to UHC upon payment in accordance with 
paragraph 7.1.

       8.3     ActaMed will provide free Network maintenance and support
services to UHC at a minimum level which will meet or exceed the free Network
maintenance and support 

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      8

<PAGE>

ActaMed provides to its other customers for the Network. ActaMed will also 
provide the support and maintenance services to UHC which are specified on 
Exhibit F attached to this Agreement.  ActaMed will notify UHC of any 
technical errors in the Network Software reported to the ActaMed help desk, 
and will use reasonable efforts to provide customers with corrections of such 
technical errors in a timely manner.  ActaMed will provide all support and 
maintenance services directly to UHC and the Providers who subscribe to the 
Network, as required.  UHC shall have no obligation to provide any support, 
training or maintenance services to Providers, other than as specified on 
Exhibit F attached to this Agreement.  In order to allow UHC to implement a 
new release of the Network or the Licensed Materials on an orderly schedule, 
ActaMed shall maintain the current release and one prior release of the 
Network and the Licensed Materials, at all times.  The maintenance services 
specified in this Agreement shall be provided at no cost to UHC beyond the 
fees set forth below in section 12.

       8.4     UHC inquiries and appeals will be handled by ActaMed within 
time frames specified on Exhibit F or as mutually agreed to, and with the 
utmost customer focus in mind.

       8.5     ActaMed will maintain the security standards for the Network 
which are set forth on Exhibit G attached to this Agreement.

       9.      EXCLUSIVITY.

       9.1     UHC agrees to use the services of the Network under this 
Agreement.  UHC agrees that it will accept and attempt to process all 
transactions listed on Exhibit H and intended for UHC which the Network 
delivers to UHC.  UHC will pay ActaMed for all such transactions pursuant to 
paragraph 12.1 of this Agreement.

       9.2     For [*] term of this Agreement (except as otherwise permitted 
under this Agreement), UHC will not promote, develop, sell or distribute any 
product [*] except as permitted under this Agreement.  UHC also agrees that 
it will not develop an interface for any third party, or provide any third 
party with access to Cosmos or any other host computer under the control of 
UHC for the purpose of developing an interface for any network that competes 
with the Network, except to the extent UHC is allowed to work with other 
vendors under this section 9 or UHC is allowed to continue existing projects 
under paragraph 9.6.

       9.3     For [*] term of this Agreement, UHC will not promote or 
contract for services providing essentially the same functionality as the 
Network from third party providers of [*] PROVIDED, HOWEVER, that UHC shall 
not be required to terminate any existing contracts with vendors of services 
similar to the Network (including, specifically, the contracts entered into 
by The MetraHealth Companies, Inc.), which are listed on Exhibit K attached 
to this Agreement.  Prior to automatic or optional renewal of any such 
contracts, however, UHC shall give ActaMed 15 business days in which to bid 
on such contracts, 

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      9
<PAGE>

pursuant to paragraph 9.7 of this Agreement.  UHC shall cease actively 
promoting any products similar to the Network from vendors other than ActaMed 
in markets where ActaMed's services are available; provided, however, that 
UHC may promote products similar to the Network in markets where ActaMed has 
waived its rights under this section 9.  Nothing in this paragraph shall 
limit UHC's ability to meet its contractual obligations in such existing 
contracts, such as a contractual obligation to perform specified promotional 
activities.

       9.4     UHC agrees that, for [*] term of this Agreement, UHC will not 
and will not permit any of its subsidiaries to, directly or indirectly, (a) 
engage in or (b) have any ownership or equity interest exceeding five percent 
in any business, firm, corporation, joint venture, or other entity engaged in 
any business which competes with ActaMed's Network product (a "Competitive 
Business").  However, nothing contained herein shall prohibit UHC from 
acquiring any business, the principal line of business of which is not a 
Competitive Business and less than fifty percent of the revenues of which are 
derived from a Competitive Business.  In such case, UHC shall use its 
reasonable efforts to cause the competitive portion of such business to be 
sold or disposed of as soon as reasonably possible, and, pending such sale, 
shall not use such business in such manner as would violate the provisions of 
this section 9 or seek to expand such business in a manner that would 
substantially adversely affect ActaMed's rights hereunder.  Not later than 
one month following such acquisition, UHC shall give to ActaMed a notice of 
the acquisition of such Competitive Business and set forth the net purchase 
price (collectively, a "Sale Proposal") at which UHC would be prepared to 
sell such Competitive Business to ActaMed.  ActaMed she have the right to 
purchase such Competitive Business for such terms or on such other basis as 
UHC and ActaMed may actually agree.  In the event that, within 60 days after 
ActaMed's receipt of a Sale Proposal, UHC and ActaMed shall not have reached 
agreement that ActaMed will acquire such Competitive Business, each of UHC 
and ActaMed shall appoint an appraiser, which two appraisers shall select a 
mutually acceptable third appraiser.  As promptly as practicable such three 
appraisers shall determine the fair value of the Competitive Business and 
shall notify UHC and ActaMed of their determination.  ActaMed shall have 
sixty days after such notification in which to determine whether to acquire 
the CompetitiveBusiness at the value so determined.  If ActaMed does not 
elect to acquire the Competitive Business at the appraised value, UHC shall 
be free to sell such Competitive Business to another entity; PROVIDED, 
HOWEVER, that UHC shall not sell such Competitive Business to another entity 
within six months after the appraisers' determination on terms and conditions 
which are substantially more favorable to such other entity than the terms 
and conditions last offered to ActaMed.

       9.5     The restrictions set forth in this section 9 shall apply only 
to activities within North America.

       9.6     Nothing in this section 9 shall be construed to prohibit UHC 
from engaging in activities relating to or contracting with third parties 
relating to the following, as long as each of the following is not intended 
primarily as a connection from a Provider's desk to a 

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      10
<PAGE>

network for communication of data:

       (a)     promoting, developing, using, selling, and distributing its 
               EmployerLink and LaborLink products and future versions of 
               them, and any other initiatives for employers and brokers, and 
               shall retain the right to contract with third parties to 
               perform any work relating to these products.  UHC agrees, 
               however, that EmployerLink, LaborLink and such other 
               initiatives shall not be intended for use primarily as 
               connections to Providers' desk tops;
       
       (b)     using and developing Internet connections;
       
       (c)     electronic medical records and clinical data;
       
       (d)     electronic mail (other than e-mail to and from a Provider's desk
               top);
       
       (e)     financial or banking electronic data interchange,
               telecommunications networks, or EDI used by the UHC purchasing
               department or other internal departments which are not connecting
               to a Provider's desk top;
       
       (f)     EDI between clinics and other facilities owned and/or operated by
               UHC;
       
       (g)     claims repricing; or
       
       (h)     UHC's "Total Recall" project, AdjudiPro product, or Q-Star
               product, and all future versions of them.

       9.7     In the event that this section 9 requires UHC to offer any 
business opportunities or new development work to ActaMed, ActaMed shall 
notify UHC of ActaMed's prices and terms for such business or work.  If 
ActaMed declines such business or work, or if ActaMed cannot provide the 
requested business or work to UHC [*] [*] UHC shall have the right to 
contract with a third party for such business or work or to do such business 
or work itself, and the provisions of this section 9 shall not apply to such 
business or work.  To [*] ActaMed's [*] is [*] the parties [*] among other 
things, the [*] by [*] from [*] the [*] and the [*] offered by [*] and 
whether [*].  If the parties cannot agree upon [*] the parties shall resolve 
the dispute pursuant to section 15.  In the event that any customer and/or 
supplier, including an integrated delivery system, of UHC or a UHC Affiliate 
requires, as a condition of doing business with the customer or supplier, 
that a different EDI system be-used in regard to that customer or supplier, 
UHC shall use all reasonable efforts to encourage the customer or supplier to 
utilize ActaMed's EDI system.  In the event the customers or 

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      11

<PAGE>

supplier [*], UHC or the UHC Affiliate [*] with [*].

       9.8     For the initial five year term of this Agreement, ActaMed agrees
that it will not sell or distribute the Network in the Republic of South Africa,
except with UHC's prior, written approval.

       9.9     This section 9 shall not preclude UHC from providing factual
information on other EDI vendors to Providers, as long as this section 9 permits
UHC to work with such vendors and provided UHC does not promote such vendors.

       10.     PERFORMANCE STANDARDS.

       10.1    Exhibit I to this Agreement specifies the performance standards
and measurements ActaMed must achieve and the applicable time periods for
measuring compliance with the performance standards (the "Performance
Standards").  The parties shall measure, at a minimum, performance of ActaMed's
help desk and customer support and the Network.  The goal of these Performance
Standards is to ensure that the performance of the Network during the term of
this Agreement meets or exceeds the performance of the ProviderLink Network
immediately prior to the Effective Date.  In addition, ActaMed shall develop and
deliver to UHC, from time to time, ActaMed's plans to increase performance of
the Network beyond the minimum levels specified in Exhibit I.

       10.2    The Performance Standards on Exhibit I apply only to transactions
sent from or to Cosmos.  At any time that UHC uses a different host computer to
connect to the Network, the parties shall mutually agree upon performance
standards for the Network and its connection to the different host computer,
which shall become an amendment to this Agreement.

       10.3    Any time that UHC's host computers are down and/or the down time
on UHC computers will not be counted as down time for the Network.

       10.4    In the event that ActaMed fails to meet any Performance Standard
on Exhibit I in any month, ActaMed shall begin to diagnose the cause of the
failure to meet the Performance Standard promptly after being notified of or
discovering the failure to perform.  Thereafter, ActaMed shall work continuously
and diligently to correct such failure to perform until it is corrected.  The
failures to meet the Performance Standards which occur while ActaMed is working
to remedy the problem shall continue to be counted for the purposes of paragraph
10.5.

       10.5    In the event that ActaMed fails to meet any Performance Standard
on Exhibit I for [*] in any [*] period, ActaMed shall be deemed to
be in material breach of this Agreement, which allows UHC to terminate this
Agreement under paragraph 14.2 of this Agreement.  In this event, UHC shall also
have the right, at its option, to

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      12
<PAGE>

terminate section 9 of this Agreement and retain the rest of the Agreement in
full force and effect, by giving the notice and opportunity to cure specified
in paragraph 14.2 of this Agreement.

       11.     REPRESENTATIONS AND WARRANTIES.

       11.1    The parties agree that ActaMed owns the Network and ActaMed
represents that it has the right to license the Licensed Materials and grant
access to the Network to UHC.  All rights in patents, copyrights, trademarks and
trade secrets encompassed in the Licensed Materials will remain in ActaMed or
its licensors, as applicable.  No title to or ownership of the Licensed
Materials is transferred to UHC.  UHC agrees that it does not obtain any rights
in the Licensed Materials except the limited right to use the Licensed Materials
as provided herein.

       11.2    ActaMed agrees to defend UHC against and, to the extent of
amounts paid to third parties in infringement damage awards and approved
settlement awards, hold it harmless from all claims, damages and liabilities
resulting from a claim that the Network or the Licensed Materials (other than
the version of the Licensed Materials which ActaMed acquired from UHC) infringes
a United States patent or United States copyright, provided that UHC gives
ActaMed prompt, written notice of any such claim, sole control of the defense
and settlement of such claim, and all reasonable assistance to defend such
claim.  UHC may appear in such action with counsel of its choice, at its own
expense.  ActaMed shall have no obligations under this paragraph if such claims,
damages and liabilities result from UHC's breach of any term of this Agreement,
UHC's unauthorized use of or modifications to the Licensed Materials or the
Network, or the combination of the Licensed Materials with other materials not
provided by ActaMed.

       11.3    If UHC's right to use the Licensed Materials or the Network is
enjoined or limited in any way, or if ActaMed believes that the Licensed
Materials or the Network is likely to become subject to such action, then
ActaMed, at its option and expense, may either:

       (a)     procure for UHC the right to continue to use the Licensed
               Materials and the Network free from such limitations;

       (b)     modify the Licensed Materials and the Network to be free from
               such limitations, but equivalent in all material functional and
               performance respects to the Licensed Materials and Network prior
               to such modification;

       (c)     replace the Licensed Materials and the Network with materials
               that are free of claims, but equivalent in all material
               functional and performance respects to the Licensed Materials and
               the Network; or

       (d)     if none of the above are reasonably possible or likely to be
               effective,


                                      13
<PAGE>

               terminate this Agreement and the licenses granted herein.

       11.4    Except as set forth in this Agreement, ACTAMED EXPRESSLY
DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, RELATING TO THE NETWORK OR
SERVICES TO BE PERFORMED BY ACTAMED HEREUNDER, INCLUDING, BUT NOT LIMITED TO,
THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE OR USE.

       12.     PRICES, PATENTS AND AUDITS.

       12.1    For [*] after the date of this Agreement, UHC will pay ActaMed 
(a) [*] per user site identification number established by ActaMed at UHC; 
(b) [*] per user site identification number established by ActaMed for which 
UHC has agreed to be responsible; (c) [*] per transaction listed on Exhibit H 
attached to this Agreement, [*] and (d) [*] transaction listed on 
Exhibit H [*]. UHC shall not pay for any transactions a Provider sends to a 
different payor. ActaMed shall not charge UHC for any unclean transactions 
which are not able to access UHC's host computer.  These payments cover all 
license fees, subscription fees, and access fees for usage of the Licensed 
Materials and the Network and all fees for the maintenance services set forth 
in section 8.

       12.2    The fees set forth in paragraph 12.1 do not cover charges for any
services UHC requests and obtains from ActaMed beyond the services specified in
paragraph 12.1, including, without limitation, file transfer of data,
installation, implementation or Enhancements of the Network, a particular sales
effort from ActaMed which ActaMed would not otherwise be providing, or a
telecommunications connection between the Network and UHC's host computers.  For
all services UHC requests from ActaMed for which this Agreement does not set
forth a price (including, without limitation, UHC's request for a particular
sales effort from ActaMed which ActaMed would not otherwise be providing), UHC
shall pay ActaMed an agreed upon price.  ActaMed shall not charge UHC anything
for installation and implementation of the Network at sites where UHC chooses to
do the installation and implementation itself.  UHC shall pay all taxes levied
in connection with this Agreement, except for any taxes based on ActaMed's net
income.

       12.3    After [*] after the date of this Agreement, the parties shall 
agree upon prices to supersede the prices in paragraph 12.1 of this 
Agreement, which new prices shall [*] [*].  To [*] is [*] the parties shall 
[*] among other things, the [*].  If the parties cannot agree upon [*] the 
parties shall resolve the dispute pursuant to section 15.

       12.4    When ActaMed offers transactions other than those set forth on
Exhibit H,

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      14
<PAGE>

UHC will decide, in its sole discretion, whether it will agree to receive
and/or send such transactions.  Upon deciding to receive and/or send any such
new transaction, UHC shall pay ActaMed a mutually agreeable price for its own
such transactions and for such transactions from any other user site
identification number where UHC (in its sole discretion) decides to be
responsible for the fees.

       12.5    ActaMed will bill UHC monthly for the site and transaction fees
for UHC and any Providers where UHC has asked ActaMed to bill UHC directly, in a
mutually agreeable format.  When ActaMed bills UHC for a Provider's site and
transaction fees, ActaMed shall not bill the Provider directly for the same
charges.  Invoices will include any additional fees for other services purchased
by UHC.  UHC agrees to pay all undisputed fees and expenses invoiced by ActaMed
within thirty days after receipt of each invoice, and to pay a late payment
charge equal to the lesser of [*] per month or the maximum rate allowed by
law on all amounts outstanding after thirty days.

       12.6    ActaMed shall maintain accurate and complete books and records
regarding the transactions to and from UHC and the amounts ActaMed is charging
UHC under this Agreement, with a system of audit trails, records and controls
sufficient to satisfy the requirements imposed on ActaMed by its external
auditors and governmental regulators.  UHC shall have the right, not more often
than once in each calendar year, to have employees or mutually agreeable
external auditors audit the books and records of ActaMed relating to UHC
transactions and charges for which UHC is responsible, to determine the proper
amounts which should have been billed to UHC, which were billed to UHC, and
which UHC has paid under this Agreement, and ActaMed's procedures for handling
transactions to and from UHC.  UHC shall give ActaMed two weeks prior notice of
any such audit, and shall abide by reasonable ActaMed security and
confidentiality procedures during the audit.  UHC shall bear the cost of such
audit, provided that in the event the audit determines that ActaMed has
overcharged UHC by more than five percent of the amount properly due ActaMed in
any month beginning on or after July 1, 1996, ActaMed shall pay all costs of
such audit.

       12.7    ActaMed will, at its expense, provide UHC annually with a report
produced in accordance with standards established by the American Institute of
Certified Public Accounts' Statement on Auditing Standards Number 70: Reports on
the Processing of Transactions by Service Organizations.  ActaMed shall submit
the first such report to UHC by the end of third quarter 1997.

       13.     CONFIDENTIALITY AND SECURITY.

       13.1    "Proprietary Information" means information that is (a)
confidential to the business of a party, including, without limitation, computer
software source code, technical documentation and information regarding
proprietary computer systems, marketing and product development plans, financial
and personnel information, and other business information not generally known to
the public; and (b) is designated and identified as such

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      15
<PAGE>

by a party, or which the other party should have reasonably known was
confidential.  Proprietary Information belonging to ActaMed includes, without
limitation, the Licensed Materials and the source code for its proprietary
software used in connection with the Network.  Proprietary Information
belonging to UHC includes, without limitation, information relating to Cosmos
or other UHC computer systems, and information regarding UHC's members,
Providers or health plans.  "Proprietary Information" does not include
information which a party had in its possession prior to receiving it from
the other party, or which a party properly receives from a third party, or
which is or becomes available to the public, or which a party independently
develops without reference to information received from the other party under
this Agreement.

       13.2    Proprietary Information and all physical embodiments thereof
received by either party (the "Receiving Party") from the other party (the
"Disclosing Party") during the term of this Agreement are confidential to and
are and will remain the sole and exclusive property of the Disclosing Party.  At
all times, both during the term of this Agreement and after its termination, the
Receiving Party shall hold all Proprietary Information of the Disclosing Party
in confidence, and will not use, copy or disclose such Proprietary Information
or any physical embodiment thereof (except as permitted by this Agreement), or
cause any of the Proprietary Information to lose its character as confidential
information.

       13.3    The Disclosing Party's Proprietary Information shall be
maintained under secure conditions by the Receiving Party, using reasonable
security measures which shall be not less than the same security measures used
by the Receiving Party for the protection of its own Proprietary Information of
a similar kind, and any specific security measures required by this Agreement.
The Receiving Party shall not remove, obscure or deface any proprietary legend
relating to the Disclosing Party's rights, on or from any tangible embodiment of
any Licensed Materials without the Disclosing Party's prior written consent.
Within thirty days after the termination of this Agreement, the Receiving Party
shall deliver to the Disclosing Party all Proprietary Information belonging to
the Disclosing Party, and all physical embodiments thereof, then in the custody,
control or possession of the Receiving Party.

       13.4    If the Receiving Party is ordered by a court, administrative
agency or other governmental body of competent jurisdiction to disclose
Proprietary Information, or if it is served with or otherwise becomes aware of a
motion or similar request that such an order be issued, then the Receiving Party
will not be liable to the Disclosing Party for disclosure of Proprietary
Information required by such order if the Receiving Party complies with the
following requirements:

       (a)     If an already-issued order calls for immediate disclosure, then
               the Receiving Party shall immediately move for or otherwise
               request a stay of such order to permit the Disclosing Party to
               respond as set forth in this paragraph 13.4; and

       (b)     The Receiving Party shall immediately notify the Disclosing Party
               of the


                                      16
<PAGE>

               motion or order by the most expeditious possible means; and

       (c)     The Receiving Party shall join or agree to (or at a minimum shall
               not oppose) a motion or similar request by the Disclosing Party
               for an order protecting the confidentiality of the Proprietary
               Information including joining or agreeing to (or not opposing) a
               motion for leave to intervene by the Disclosing Party.

       13.5    The Receiving Party shall immediately report to the Disclosing
Party any attempt by any person of which the Receiving Party has knowledge (a)
to use or disclose any portion of the Proprietary Information without
authorization from the Disclosing Party; or (b) to copy, reverse assemble,
reverse compile or otherwise reverse engineer any part of the Proprietary
Information (except as permitted herein).

       13.6    Each party agrees not to disclose or utilize individual health
care claim information in any way that would violate any physician-patient
confidence or any state or federal regulations.

       13.7    The obligations of this section 13 shall survive termination or
expiration of this Agreement as to any Proprietary Information which falls under
the definition of "trade secret" under the Uniform Trade Secret Act, as adopted
in the State of Georgia and as amended from time to time.  For all other
information which falls under the definition of Proprietary Information used in
this Agreement, the obligations of this section 13 shall terminate five years
after termination or expiration of this Agreement.

       14.     TERM AND TERMINATION.

       14.1    This Agreement commences as of the date set forth above and
continues for five years thereafter, unless earlier terminated as provided
herein.  The parties shall mutually agree upon any renewal of this Agreement,
but the provisions of section 9 shall not be part of any renewal.  Upon
termination or expiration of this Agreement, UHC's rights to use the Licensed
Materials and the Network shall cease.

       14.2    If one party breaches any material provision of this Agreement,
the nonbreaching party may terminate this Agreement by giving 60 days written
notice of termination to the breaching party.  If the breach is capable of being
cured and the other party acts diligently and continuously to cure such breach
within the 60 days, the termination shall not become effective.  In the event
ActaMed attempts to terminate this Agreement pursuant to this paragraph 14.2 due
to UHC's failure to pay any undisputed amounts due, the sixty day notice and
cure period set forth above shall be reduced to fifteen working days.

       14.3    If UHC or an affiliate thereof shall, at any time, cease to
manage or administer any Managed Plan, then, as of the date of such cessation,
this Agreement shall terminate as to such Managed Plan.  UHC shall inform
ActaMed that an entity has ceased or will cease to be a Managed Plan promptly
after such information is known to UHC.


                                      17
<PAGE>

       14.4    Upon termination or expiration of this Agreement, the parties
shall cooperate in the orderly and reasonable removal of UHC from the Network.
The parties shall jointly develop a transition plan, which will allow UHC to use
the Network services for a mutually agreeable time after termination or
expiration, which shall be not less than three months.  The transition plan will
provide for a reasonable level of support to transition UHC off the Network.
Each party will bear its own costs in developing the transition plan.  During
such additional time, UHC shall continue to pay ActaMed all fees due under
section 12 of this Agreement.  In the event that ActaMed has terminated this
Agreement pursuant to paragraph 14.2 due to UHC's failure to pay amounts due to
ActaMed, ActaMed will not be required to perform services for UHC or to allow
UHC access to the Network during the transition period unless UHC pays ActaMed
in advance for such services and Network access.  UHC shall not be obligated to
pay any site or transaction fees that accrue after the effective date of
termination with respect to Providers that remain connected to the Network.

       15.     DISPUTE RESOLUTION.

       15.1    In the event a dispute between ActaMed and UHC arises out of or
is related to this Agreement, either party may request in writing that the
representatives of the parties designated pursuant to paragraph 3.2 of this
Agreement meet and negotiate in good faith to attempt to resolve the dispute
without a formal proceeding.  During the course of such negotiations, all
reasonable requests made by one party to the other for information, including
copies of relevant documents, will be honored.  The specific format for such
discussions will be left to the discretion of the designated representatives.

       15.2    If the designated representatives conclude in good faith that
amicable resolution through continued negotiation in this forum does not appear
likely, then the matter will be escalated to a joint panel of ActaMed and UHC
senior executives, by formal written notification by either party to the other.
This panel will meet as required to attempt to resolve the dispute.  The number
and nature of the senior executives will depend on the issues in dispute, but
will include those senior executives with authority to resolve all matters in
dispute.  At either party's election, this panel will be facilitated by an
external facilitator designated by both parties.

       15.3    Formal proceedings for the resolution of a dispute may not be
commenced until the earlier of (a) the panel referred to in paragraph 15.2
concluding in good faith that amicable resolution through continued negotiation
of the matter does not appear likely; or (b) 30 days after the first notice of
the dispute was sent under paragraph 15.1 or paragraph 15.2.  However, nothing
in this section 15 shall preclude either party from seeking temporary or
preliminary injunctive relief where a party determines in good faith that such
relief is necessary to limit its damage or injury under this Agreement.

       15.4    In the event the dispute is not resolved as outlined in
paragraphs 15.1 and 15.2, and if either party wishes to pursue the dispute,
either party may submit it to binding


                                      18
<PAGE>

arbitration in accordance with the rules of the American Arbitration
Association.  In no event may arbitration be initiated more than one year
following the sending of written notice of the dispute.  The parties shall
request a list from the American Arbitration Association of five possible
arbitrators who shall each have had at least five years experience in some
aspect of computer networking matters or health care. Each of the parties
will select one of these arbitrators and the parties or their selected
arbitrators shall jointly select the third arbitrator from the proposed list.
Any arbitration proceeding under this Agreement shall be conducted in
Hennepin County, Minnesota, Atlanta, Georgia, or in a mutually agreeable
location.  The arbitrators shall have no authority to award any punitive or
exemplary damages, or to vary or ignore the terms of this Agreement, and
shall be bound by controlling law.

       16.     LIMITATION ON DAMAGES AND ALLOCATION OF RISK.

       16.1    Except to the extent of ActaMed's obligation to indemnify UHC 
as provided in [*] IN NO EVENT SHALL EITHER PARTY'S LIABILITY TO THE OTHER 
PARTY (INCLUDING LIABILITY TO ANY PERSON WHOSE CLAIM OR CLAIMS ARE BASED ON 
OR DERIVED FROM A RIGHT OR RIGHTS CLAIMED BY THE OTHER PARTY) WITH RESPECT TO 
ANY AND ALL CLAIMS ARISING FROM OR RELATING TO THE SUBJECT MATTER OF THIS 
AGREEMENT IN CONTRACT, TORT OR OTHERWISE, EXCEED [*].

       16.2    NEITHER PARTY SHALL BE LIABLE TO THE OTHER PARTY (NOR TO ANY
PERSON CLAIMING RIGHTS DERIVED FROM THE OTHER PARTY'S RIGHTS) FOR INCIDENTAL,
CONSEQUENTIAL, SPECIAL, PUNITIVE OR EXEMPLARY DAMAGES OF ANY KING (INCLUDING,
BUT NOT LIMITED TO, LOST PROFITS, LOSS OF BUSINESS OR OTHER ECONOMIC DAMAGE) AS
A RESULT OF BREACH OF THIS AGREEMENT.

       16.3    Notwithstanding anything to the contrary set forth in this
Agreement, ActaMed shall not be responsible for any breach of this Agreement or
loss to UHC to the extent such breach or loss is caused by materials that
ActaMed purchased from UHC or services provided by UHC.

       17.     GENERAL.

       17.1    This Agreement, including the Exhibits to it, constitutes the
entire understanding between the parties and supersedes all proposals,
communications and agreements between the parties relating to its subject
matter.  However, this Agreement does not supersede the UHC Outsourcing
Agreement between ActaMed and UHC, dated December 4, 1995, as amended from time
to time.  No amendment, change, or waiver of any provision of this Agreement
will be binding unless in writing and signed by both parties.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      19
<PAGE>

       17.2    This Agreement will be governed by and construed in accordance
with the laws of the State of Georgia applicable to contracts made and performed
therein.

       17.3    Neither party may assign this Agreement without the prior,
written consent of the other party, which shall not be unreasonably withheld.
Any attempted assignment without such consent shall be void.  Any assignment
with consent does not release the assigning party from any of its obligations
under this Agreement unless the consent so states.  Notwithstanding the above,
however, ActaMed may assign this Agreement without UHC's consent to the
purchaser of all or substantially all the business or assets of ActaMed related
to the Licensed Materials and the Network, as long as the purchaser is not a
company which competes with UHC in any of the businesses UHC owns or operates at
the time of the assignment.  If the parties cannot agree upon whether a company
competes with UHC in any of the businesses UHC owns or operates at the time of
the assignment, the parties shall resolve the dispute pursuant to section 15.

       17.4    Any notices relating to this Agreement shall be in writing and
will be sent by certified United States mail, postage prepaid, return receipt
requested, or by facsimile transmission or overnight courier service, addressed
to the party at the address set forth below, or at such different address as a
party has advised to the other party in writing and shall be deemed given and
received when actually received:

       United HealthCare Corporation                ActaMed Corporation
       9900 Bren Road East                          7000 Central Parkway
       Minneapolis, MN 55440                        Suite 600
       Attn: Chief Information Officer              Atlanta, Georgia 30328
                                                    Attn: President

       17.5    In the event one or more of the provisions of this Agreement are
found to be invalid, illegal or unenforceable by a court with jurisdiction, the
remaining provisions shall continue in full force and effect.

       17.6    The obligations of the parties under this Agreement (other than
the obligation to make payments) shall be suspended to the extent a party is
hindered or prevented from complying therewith because of labor disturbances
(including strikes or lockouts), war, acts of God, fires, storms, accidents,
governmental regulations, failure of telecommunications vendors or suppliers, or
any other cause whatsoever beyond a party's control.  For so long as such
circumstances prevail, the party whose performance is delayed or hindered shall
continue to use all commercially reasonable efforts to recommence performance
without delay and shall declare a disaster under its disaster recovery plan.

       17.7    Each party shall have the right to include the other party's name
on its customer or vendor list and to disclose the nature of the services and
products provided under this Agreement, so long as such services and products
are accurately represented; provided, however, that neither party has the right
to use the other's name, trademarks or


                                      20
<PAGE>

trade names for other advertising, sales promotion, or publicity purposes
without the other's prior written consent.

       17.8    During the term of this Agreement, neither party will solicit or
attempt to hire any individual who is then currently an employee of the other
party or who has been an employee of the other party within the six months prior
to the solicitation or hiring, without the other party's prior, written consent.
This paragraph 17.8 shall only apply to individuals who, in the case of ActaMed,
have performed services for UHC under this Agreement or worked in connection
with the Network or the Licensed Materials, or who, in the case of UHC, have
worked with ActaMed or received services from ActaMed, on behalf of UHC.

       THIS AGREEMENT CONTAINS A BINDING ARBITRATION PROVISION THAT MAY BE
ENFORCED BY THE PARTIES.

       This Agreement may be executed in one or more counterparts each of which
shall be deemed an original, but all of which together shall constitute one and
the same instrument.

       IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date set forth above.

UNITED HEALTHCARE CORPORATION                ACTAMED CORPORATION

By:   /s/ Travers H. Wills                   By:  /s/  Michael K. Hoover
   -------------------------------              -------------------------------
Its:   Chief Operating Officer               Its:  President
    ------------------------------               ------------------------------
Date:                                        Date:  April 4, 1996
     -----------------------------                -----------------------------


                                      21

<PAGE>

                                 EXHIBIT LIST

Exhibit A:     Managed Plans

Exhibit B:     Licensed Materials

Exhibit C:     Development Work in Progress

Exhibit D:     Reports

Exhibit E:     Escrow Agreement

Exhibit F:     Network Maintenance and Support Services

Exhibit G:     Security

Exhibit H:     Transactions

Exhibit 1:     Performance Standards and Methods of Measurement

Exhibit J:     UHC Operating Environment

Exhibit K:     MetraHealth EDI Contracts



                                      22
<PAGE>

                                     EXHIBIT A

                                   MANAGED PLANS


Community Health Network of Louisiana, Inc. (purchase pending)
PHP, Inc. (Michigan)
     PHP of Mid Michigan
     PHP of South Michigan
     PHP of Southwest Michigan
     PHP of West Michigan
PHP of South Carolina
PHP of North Carolina, Inc. (purchase pending)

Physicians Plus Insurance Corporation
Allina



<PAGE>

                                     EXHIBIT B

                                 LICENSED MATERIALS

<TABLE>
<CAPTION>
                                                    Right to       Right to
                                                    Reproduce      Modify
                                                    ---------      ------
<S>                                                 <C>            <C>
 *User Manual, versions 2.1 and 2.2.5               No             No

 Portal Specifications                              No             No
      Communications Interface Document
      HCFA Claim Validations
      HCFA National Standard Format Claims
      ANSI X12 837 Claims Format
      Implementation Guide for Claims
      ANSI Xl 2 835 Electronic Remittance Advice
      UB92 Hospital Claim Format
      DOS Command Line Routines
      UNIX Command Line Routines

 Training Materials
      Version 2.2.5 Demo Disks and CSI Demo Disks   Yes            Yes
      PL Training Manual                            Yes            Yes

 Network: EDI TCP/IP Interface Specification        No             No

 Promotional Material
      ProviderLink Brochure                         Yes            Yes
      ProviderLink Send Back Card                   Yes            Yes
</TABLE>


*ActaMed will, upon request from UHC, identify UHC as the sponsor and promoter
of these materials.


<PAGE>

                                     EXHIBIT C

                            DEVELOPMENT WORK IN PROGRESS

Projects which are completed or will be completed by ActaMed as part of the
sale:

1.   COSMOS Distributed 'A'
2.   Ohio health plan merger
3.   Separation of the EmployerLink-ProviderLink network.  At that time, a
     comprehensive list of hardware and software products required will be
     provided to ActaMed.
4.   ORBIT
5.   MHS "Mail Rules"


<PAGE>

                    EMPLOYERLINK SPLIT FROM PROVIDERLINK NETWORK

                               PRODUCTION ENVIRONMENT

<TABLE>
<CAPTION>
<S>                                                               <C>
 ACQUIRE ALTERNATE HARDWARE:
      [*]                                                        20 hours, UHC
      [*]                                                         4 hours, UHC
      [*]                                                         2 hours, UHC
      [*]                                                        20 hours, UHC
      [*]                                                        10 hours, PL

 ACQUIRE ALTERNATE SOFTWARE:
      [*]                                                         10 hours, UHC
      [*]                                                          6 hours, UHC
      [*]                                                           2 hour, UHC

 INSTALL VENDOR HARDWARE/SOFTWARE:
      [*]                                                         40 hours, UHC
      [*]                                                         40 hours, UHC
      [*]                                                         10 hours, UHC
      [*]                                                         10 hours, PL

 SPLIT PRODUCTION EMPLOYERLINK NETWORK SOFTWARE FROM
 PROVIDERLINK:

      [*]                                                         30 UHC, 15 PL
      [*]                                                         30 UHC,  8 PL
      [*]                                                         30 UHC,  8 PL
      [*]                                                         50 UHC
      [*]                                                         40 UHC, 20 PL
      [*]                                                         15 hours, PL
</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


<PAGE>

                                     EXHIBIT D

                                      REPORTS

REPORTS ACTAMED WILL PROVIDE TO UHC

The following reports will be provided to UHC from ActaMed on a routine schedule
as indicated.


- -    Orbit reports

Three [*] core operating reports, for each market, will be sent to each
health plan lead ProviderLink/EDI representative and a central UHC corporate
resource.  (Available electronically or on paper as requested.)

<TABLE>

<S>                                                                        <C>
     UNI Access Status Report                                              [*]
     Monthly Detail Transaction report by source UNI                       [*]
     Monthly Detail Transaction report by Destination Market               [*]

- -    Intercompany billing detail reports for use in determining 
     allocation of transaction expensed to the proper health plan or 
     business unit.

     Summary of fees by health plan detailed by plan and DIV               [*]
     Intercompany Billing Details-site fees, mail and Era transactions     [*]
     Intercompany Billing Details-transaction charges                      [*]
</TABLE>

- -    Help Desk Reports

The following problem notification procedures will be performed by the ActaMed
Help Desk staff by call priority level.  Severity levels are defined in Exhibit
1.  Reporting on these activities will be provided to UHC upon request.

Severity 1 - High priority calls will be reported to a health plan on a [*]
basis.  A report listing each call and its status will be electronically 
mailed or faxed the following morning.  For a specific high priority call, if 
closure is not expected within [*], a call will be placed to the UHC health 
plan ProviderLink representative.  If the call is closed within [*], 
notification to UHC health plan ProviderLink representative via the next 
morning's E-mail report is acceptable.  If an UHC health plan ProviderLink 
representative cannot be accessed "live", a voice mail will be left.  [*] 
contact with the customer is required until closure.

Severity 2 - Normal priority calls will also be reported on a [*] report 
listing each call and its status.  No telephone calls will be placed to the 
plan for these calls except on and as needed basis.  Regular customer contact 
is required until closure.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


<PAGE>

Severity 3 - Low-priority calls will also be reported in a [*] report to UHC
health plan ProviderLink representative containing all calls and status.
Customer contact is required as needed or when a course of action has been
determined.

- -    In the event that the ActaMed Help Desk computerized on-line problem
     management tool is down, call information will be recorded manually and
     entered into the system as soon as it becomes available.

- -    Required problem resolution timeframes are outlined in Exhibit D.

- -    ActaMed should prepare a quarterly Executive Summary report for UHC
     management detailing the customer issues raised during this time frame and
     the resolution of these problems.

- -    Network Availability Reports
       Modem connectivity-actual performance to standard              Monthly
       Network Transaction Success rate by plan, and in the
       aggregate                                                      Monthly
       Host and Modem availability                                    Monthly

- -    Itemization and accounting for the hours worked by the UHC Dedicated Team,
     and a project status report on each item worked.


Reports UHC will provide to ActaMed

These reports will include data from health plans centralized on COSMOS, those
plans with decentralized UHC host systems including, but not limited to,
Complete, PrimeCare, Ramsay, UHC Illinois, etc., and all ex-MetraHealth systems
including the previous Travelers and Met Life systems.

UHC will provide a resource to coordinate the assembly of this data and will
serve as the contact for all questions regarding these reports.

- -    Membership data by health plan or market provided on paper or    Monthly
     electronically where available.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

<PAGE>

- -    Claims receipts or processed claims, for all commercial UHC      Monthly
     health plans or markets, offices or systems, including the
     total volume of claims received electronically by month and
     year-to-date, if available, actual penetration percentages
     by plans, market, offices or systems, and desired percentage
     of electronic claim receipts.

- -    Decision Support System (DSS) Data will be extracted from UHC    Monthly
     health plans and markets to support the market analysis done
     by ActaMed and for the prioritization of target providers and
     potential prospects. (A sample report is provided on 
     Attachment 1)

- -    Physician and Hospital claims volume data for each health        Quarterly
     plan/market by Provider Number and/or submitting Entity Tax
     ID including:

     *    total claims volumes received by each provider/tax ID
     *    volume received electronically (EDI) by each 
          provider/tax ID
     *    volume received on tape/other by each provider/tax ID,      Monthly
          if applicable and available

This information will be provided electronically, as available.

- -    Other data to be determined in the future to support the 
     analysis of new transactions as mutually agreed by both parties.

- -    Strategic information from UHC related to EDI growth goals       Quarterly
     and objectives by health plan/market will be provided to 
     ActaMed as needed. This will include pertinent project plans 
     and other material/documentation that will assist ActaMed to 
     enhance and increase electronic transactions for UHC.

<PAGE>




                                     EXHIBIT E





                              MASTER ESCROW AGREEMENT

                                      BETWEEN

                               PRODUCER AND FORT KNOX



     This escrow agreement is intended for use by a Producer (Developer) and
Fort Knox Escrow Services, Inc.  The Producer may escrow multiple products under
this agreement.  In addition, multiple Licensees (End Users) may be registered
as beneficiaries of this agreement.  Although each Licensee does not sign the
agreement, Fort Knox does notify them of the service.

<PAGE>

                               Master Escrow Agreement

     This Master Escrow Agreement ("Agreement") is made as of this 20th day 
of February, 1995, by and between ActaMed Corp. ("Producer") and Fort Knox 
Escrow Services, Inc. ("Fort Knox").

     PRELIMINARY STATEMENT.  Producer intends to deliver to Fort Knox a 
sealed package containing magnetic tapes, disks, disk packs, or other forms 
of media, in machine readable form, and the written documentation prepared in 
connection therewith, and any subsequent updates or changes thereto (the 
"Deposit Materials") for the computer software products (the "System(s)"), 
all as identified from time to time on Exhibit B hereto.  Producer desires 
Fort Knox to hold the Deposit Materials, and, upon certain events, deliver 
the Deposit Materials (or a copy thereof) to those persons or entities listed 
from time to time on Exhibit C hereto as a licensee of Producer ("Licensee"), 
in accordance with the terms hereof.

     Now, therefore, in consideration of the foregoing, of the mutual 
promises hereinafter set forth, and for other good and valuable 
consideration, the receipt and sufficiency of which are hereby acknowledged, 
the parties agree as follows:

     1.   DELIVERY BY PRODUCER.  Producer shall be solely responsible for 
delivering to Fort Knox the Deposit Materials as soon as practicable.  Fort 
Knox shall hold the Deposit Materials in accordance with the terms hereof.  
Except as provided in Section 10 below, Fort Knox shall have no obligation to 
verify the completeness or accuracy of the Deposit Materials.

     2.   DUPLICATION; UPDATES.

     (a)  Fort Knox may duplicate the Deposit Materials by any means in order 
to comply with the terms and provisions of this Agreement, provided that the 
Licensee to whom a copy of the Deposit Materials is to be delivered pursuant 
to the terms hereof shall bear the expense of duplication.

     (b)  Producer shall deposit with Fort Knox any modifications, updates, 
new releases or documentation related to the Deposit Materials by delivering 
to Fort Knox an updated version of the Deposit Materials ("Additional 
Deposit") as soon as practicable after the modifications, updates, new 
releases and documentation have become generally available to Producer's 
Licensees, but in any event within thirty (30) days following the first 
delivery to any Licensee.  When Producer delivers an Additional Deposit to 
Fort Knox, Fort Knox shall return to Producer the previous Deposit Materials 
it held in custody, except for the Deposit Materials that were the subject of 
the most recent previous deposit.  Except as provided in Section 10 below, 
Fort Knox shall have no obligation to verify the accuracy or completeness of 
any Additional Deposit or to verify that any Additional Deposit is in fact a 
copy of the Deposit Materials or any modification, update, or new release 
thereof.

     3.   NOTIFICATION OF DEPOSITS.  Simultaneous with the delivery to Fort 
Knox of the Deposit Materials or any Additional Deposit, as the case may be, 
Producer shall deliver to Fort Knox and to each Licensee a written statement 
specifically identifying all items deposited and stating that the Deposit 
Materials or any Additional Deposit, as the case may be, so deposited have 
been inspected by Producer and are complete and accurate.  Within five (5) 
days of receipt by Fort Knox of the Deposit Materials or any


                                       1
<PAGE>

Additional Deposit, Fort Knox will send notification of such receipt via 
certified or registered mail to the Licensee(s).

     4.   DELIVERY BY FORT KNOX

          4.1  DELIVERY BY FORT KNOX TO LICENSEES.  Fort Knox shall deliver 
the Deposit Materials, or a copy thereof, to a Licensee only in the event that:

     (a)  Producer notifies Fort Knox to effect such delivery to a Licensee 
or Licensees at a specific address or addresses, the notification being 
accompanied by a check payable to Fort Knox in the amount of one hundred 
dollars ($100.00); or

     (b)  Fort Knox receives from any Licensee:

          (i)    written notification that Producer has failed in a material
                 respect to support the applicable Systems as required by a
                 valid and existing license agreement ("License Agreement")
                 between Licensee and Producer or that Producer has generally
                 ceased its business of supporting the applicable systems
                 ("Producer Default");
          
          (ii)   evidence satisfactory to Fort Knox that Licensee has notified
                 Producer, at least ten (10) days prior to the notice to Fort
                 Knox, of such Producer Default in writing;
          
          (iii)  a written demand that the Deposit Materials be released and
                 delivered to Licensee;
          
          (iv)   a written undertaking from the Licensee that the Deposit
                 Materials being supplied to the Licensee will be used only as
                 permitted under the terms of the License Agreement;
          
          (v)    specific instructions from the Licensee for this delivery; and
          
          (vi)   a cashier's check payable to Fort Knox in the amount of five
                 hundred dollars ($500.00).

     (c)  If the provisions of paragraph 4.1(a) are satisfied, Fort Knox 
shall, within five (5) business days after receipt of the notification and 
check specified in paragraph 4.1(a), deliver the Deposit Materials in 
accordance with the applicable instructions.

     (d)  If the provisions of paragraph 4.1(b) are met, Fort Knox shall, 
within five (5) business days after receipt of all the documents specified in 
paragraph 4.1(b), send by certified mail to Producer a photostat copy of all 
such documents.  Producer shall have thirty (30) days from the date on which 
Producer receives such documents ("Objection Period") to notify Fort Knox of 
its objection ("Objection Notice") to the release of the Deposit Materials to 
a Licensee and to request that the issue of Licensee's entitlement to a copy 
of the Deposit Materials be submitted to arbitration in accordance with the 
following provisions:


                                       2
<PAGE>

          (i)    If Producer shall send an Objection Notice to Fort Knox during
                 the Objection Period, the matter shall be submitted to, and
                 settled by arbitration by, a panel of three (3) arbitrators
                 chosen by the Atlanta Regional Office of the American
                 Arbitration Association in accordance with the rules of the
                 American Arbitration Association.  The arbitrators shall apply
                 Georgia law.  At least one (1) arbitrator shall be reasonably
                 familiar with the computer software industry.  The decision of
                 the arbitrators shall be binding and conclusive on all parties
                 involved, and judgment upon their decision may be entered in a
                 court of competent jurisdiction.  All costs of the arbitration
                 incurred by Fort Knox, including reasonable attorneys' fees
                 and costs, shall be paid by the non-prevailing party.
          
          (ii)   Producer may, at any time prior to the commencement of
                 arbitration proceedings, notify Fort Knox that Producer has
                 withdrawn the Objection Notice.  Upon receipt of any such
                 notice from Producer, Fort Knox shall reasonably promptly
                 deliver the Deposit Materials to the Licensee in accordance
                 with the instructions specified in paragraph 4.1(b)(v).

     (e)  If, at the end of the Objection Period, Fort Knox has not received 
an Objection Notice from Producer, then Fort Knox shall reasonably promptly 
deliver the Deposit Materials to the Licensee in accordance with the 
instructions specified in paragraph 4.1(b)(v).

          4.2    DELIVERY BY FORT KNOX TO PRODUCER.  Fort Knox shall release 
and deliver the Deposit Materials to Producer upon termination of this 
Agreement in accordance with paragraph 7(a) hereof.

     5.   INDEMNITY.  Producer and any party claiming beneficiary status 
under this Agreement shall indemnify and hold harmless Fort Knox and each of 
its directors, officers, agents, employees and stockholders ("Fort Knox 
Indemnities") absolutely and forever, from and against any and all claims, 
actions, damages, suits, liabilities, obligations, costs, fees, charges, and 
any other expenses whatsoever, including reasonable attorneys' fees and 
costs, that may be asserted against Fort Knox Indemnitee in connection with 
this Agreement or the performance of Fort Knox or any Fort Knox Indemnitee 
hereunder, except as a result of the negligent act or omission on the part of 
Fort Knox or any Fort Knox Indemnitee.

     6.   DISPUTES AND INTERPLEADER.

     (a)  In the event of any dispute between any of Fort Knox, Producer 
and/or any Licensee relating to delivery of the Deposit Materials by Fort 
Knox or to any other matter arising out of this Agreement, Fort Knox may 
submit the matter to any court of competent jurisdiction in an interpleader 
or similar action. Any and all costs incurred by Fort Knox in connection 
therewith, including reasonable attorneys' fees and costs, shall be borne by 
the party seeking the copy of the Deposit Materials.

     (b)  Fort Knox shall perform any acts ordered by any court of competent 
jurisdiction, without any liability or obligation to any party hereunder by 
reason of such act.


                                       3
<PAGE>

     7.   TERM AND RENEWAL.

     (a)  The initial term of this Agreement shall be two (2) years, 
commencing on the date hereof (the "Initial Term").  This Agreement shall be 
automatically extended for an additional term of one year ("Additional Term") 
at the end of the Initial Term and at the end of each Additional Term 
hereunder unless, on or before ninety (90) days prior to the end of the 
Initial Term or an Additional Term, as the case may be, either party notifies 
the other party that it wishes to terminate the Agreement at the end of such 
term.

     (b)  In the event of termination of this Agreement, Producer shall pay 
all fees due Fort Knox and Fort Knox shall promptly notify all Licensees that 
this Agreement has been terminated and that Fort Knox shall promptly return 
to Producer all copies of the Deposit Materials then in its possession.

     8.   FEES.  Producer shall pay to Fort Knox fees in accordance with 
Exhibit A as compensation for Fort Knox's services under this Agreement.

     (a)  PAYMENT.  Fort Knox shall issue an invoice to Producer following 
execution of this Agreement ("Initial Invoice"), on the commencement of any 
Additional Term hereunder, and in connection with the performance of any 
additional services hereunder.  Payment is due upon receipt of invoice.  All 
fees and charges are exclusive of, and Producer is responsible for the 
payment of, all sales, use and like taxes.  Fort Knox shall have no 
obligations under this Agreement until the Initial Invoice has been paid in 
full by Producer.

     (b)  NONPAYMENT.  In the event of non-payment of any fees or charges 
invoiced by Fort Knox, Fort Knox shall give notice of non-payment of any fee 
due and payable hereunder to the Producer and, in such an event, the Producer 
shall have the right to pay the unpaid fee within thirty (30) days after 
receipt of notice from Fort Knox.  If Producer fails to pay in full all fees 
due during such thirty (30) day period, Fort Knox shall give notice of 
non-payment of any fee due and payable hereunder to the Licensee(s) and, in 
such event, the Licensee(s) shall have the right to pay the unpaid fee within 
ten (10) days of receipt of such notice from Fort Knox.  Upon payment of the 
unpaid fee by either the Producer or the Licensee(s), as the case may be, 
this Agreement shall continue in full force and effect until the end of the 
applicable term.  Failure to pay the unpaid fee under this paragraph 8(b) by 
both Producer and the Licensee(s) shall result in termination of this 
Agreement.

     9.   OWNERSHIP OF DEPOSIT MATERIALS.  Fort Knox and Producer recognize 
and acknowledge that ownership of the Deposit Materials shall remain with 
Producer at all times.

     10.  BANKRUPTCY.  Producer and Licensee acknowledge that this Agreement 
is an "agreement supplementary to" the License Agreement as provided in 
Section 365(n) of Title 11, United States Code (the "Bankruptcy Code").  
Producer acknowledges that if Producer as a debtor in possession or a trustee 
in Bankruptcy in a case under the Bankruptcy Code rejects the License 
Agreement or this Agreement, Licensee may elect to retain its rights under 
the License Agreement and this Agreement as provided in Section 365(n) of the 
Bankruptcy Code.  Upon written request of Licensee to Producer or the 
Bankruptcy Trustee, Producer or such Bankruptcy Trustee shall not interfere 
with the rights of Licensee as provided in the License Agreement and this 
Agreement, including the right to obtain the Deposit Material from Fort Knox 
in accordance with Section 3.


                                       4
<PAGE>

     11.  MISCELLANEOUS.

     (a)  REMEDIES.  Except for actual fraud, gross negligence or intentional 
misconduct, Fort Knox shall not be liable to Producer for any act, or failure 
to act, by Fort Knox in connection with this Agreement.  Fort Knox will not 
be liable for special, indirect, incidental or consequential damages 
hereunder. Licensees are intended to be third party beneficiaries as to the 
express rights and subject to the obligations set forth herein.

     (b)  NATURAL DEGENERATION; UPDATED VERSION.  In addition, the parties 
acknowledge that as a result of the passage of time alone, the Deposit 
Materials are susceptible to loss of quality ("Natural Degeneration").  It is 
further acknowledged that Fort Knox shall have no liability or responsibility 
to any person or entity for any Natural Degeneration.  For the purpose of 
reducing the risk of Natural Degeneration, Producer shall deliver to Fort 
Knox a new copy of the Deposit Materials at least once every three years.

     (c)  PERMITTED RELIANCE AND ABSTENTION.  Fort Knox may rely and shall be 
fully protected in acting or refraining from acting upon any notice or other 
document believed by Fort Knox in good faith to be genuine and to have been 
signed or presented by the proper person or entity.  Fort Knox shall have no 
duties or responsibilities except those expressly set forth herein.

     (d)  INDEPENDENT CONTRACTOR.  Fort Knox is an independent contractor, 
and is not an employee or agent of either the Producer or any Licensee.  The 
foregoing notwithstanding, nothing in this Agreement shall limit any remedies 
to which Producer may be entitled, whether at law or in equity, in connection 
with any claim relating to the misappropriation of confidential information 
or trade secrets (including the Deposit Materials) or the violation of any 
copyright or other intellectual property right of Producer.  Licensee is a 
party to this Agreement.

     (e)  AMENDMENTS.  This Agreement shall not be modified or amended except 
by another agreement in writing executed by the parties hereto, except that 
Producer may modify this Agreement at any time without the consent of Fort 
Knox to designate additional "Systems" on Exhibit B hereto and additional 
Licensees on Exhibit C hereto, as appropriate.

     (f)  ENTIRE AGREEMENT.  This Agreement, including all exhibits hereto, 
supersedes all prior discussions, understandings and agreements between the 
parties with respect to the matters contained herein, and constitutes the 
entire agreement between the parties with respect to the matters contemplated 
herein. All exhibits attached hereto are by this reference made a part of 
this Agreement and are incorporated herein.

     (g)  COUNTERPARTS; GOVERNING LAW.  This Agreement may be executed in two 
(2) counterparts, each of which when so executed shall be deemed to be an 
original and both of which when taken together shall constitute one and the 
same Agreement.  This Agreement shall be construed and enforced in accordance 
with the laws of the State of Georgia.

     (h)  CONFIDENTIALITY.  Fort Knox will hold and release the Deposit 
Materials only in accordance with the terms and conditions hereof, and will 
maintain the confidentiality of the Deposit Materials.


                                       5
<PAGE>

     (i)  NOTICES.  All notices, requests, demands or other communications 
required or permitted to be given or made under this Agreement shall be in 
writing and shall be delivered by hand or by commercial overnight delivery 
service which provides for evidence of receipt, or mailed by certified mail, 
return receipt requested, postage prepaid, and addressed as follows:

     (i)  If to Producer:
          to the address listed on the signature page hereof

     (ii) If to Fort Knox:

          Fort Knox Escrow Services, Inc.
          3539-A Church Street
          Clarkston, Georgia 30021-1717
          Attn:  Contracts Administrator
          Copy:  Michael A. Payne
                 Vice President

     If delivered personally or by commercial overnight delivery service, the 
date on which the notice, request, instruction or document is delivered shall 
be the date on which delivery is deemed to be made, and if delivered by mail, 
the date on which such notice, request, instruction or document is received 
shall be the date on which delivery is deemed to be made.  Any party may 
change its address for the purpose of this Agreement by notice in writing to 
the other parties as provided herein.

     (j)  SURVIVAL.  Paragraphs 5, 6, 8, 9 and 10 shall survive any 
termination of this Agreement.

     (k)  NO WAIVER.  No failure on the part of any party hereto to exercise, 
and no delay in exercising any right, power or single or partial exercise of 
any right, power or remedy by any party will preclude any other or further 
exercise thereof or the exercise of any other right, power or remedy.  No 
express waiver or assent by any party hereto to any breach of or default in 
any term or condition of this Agreement shall constitute a waiver of or an 
assent to any succeeding breach of or default in the same or any other term 
or condition hereof.


                                       6
<PAGE>

     IN WITNESS WHEREOF each of the parties has caused its duly authorized
officer to execute this Agreement as of the date and  year first above written.


          Fort Knox Escrow Services, Inc.
          
          By: /s/ Michael A. Payne
             ---------------------------------------------

          Title: V.P.
                ------------------------------------------
          
          Producer
          
          By:            /s/ Nancy J. Ham
                        ------------------------------------------------------

          Print Name:        Nancy J. Ham
                        ------------------------------------------------------

          Title:             CFO
                        ------------------------------------------------------

          Address:           7000 Central Parkway, Suite 620
                        ------------------------------------------------------
                             Atlanta, GA 30328
                        ------------------------------------------------------

                        ------------------------------------------------------


          Phone:             (404) 551-1600
                        ------------------------------------------------------

          Fax:               (404) 551-1601
                        ------------------------------------------------------

          Attention:         Nancy Ham
                        ------------------------------------------------------


                                       7
<PAGE>

                                     EXHIBIT A

<TABLE>
<S>                                                                            <C>
 Fees to be paid by Producer shall be as follows:

      Initialization fee (one time only)                                       $750 (payable for initial term only)

      Annual maintenance/storage fee                                           
       -  includes one Deposit Material update                                 $800/Product
       -  includes two cubic feet of storage space

      Annual Licensee registration fee                                         FULL SERVICE
                                                                               $ 150/Licensee
                                                                               (foreign licensee $250)

      Additional Updates                                                       $ 100/Product
        (above one per year)

      Additional Storage Space                                                 $ 150/Cubic foot

 Payable by Licensee or Producer:

      Due Upon Licensee's or Producer's                                        
      Request for Release of Deposit Materials                                 $ 500
</TABLE>


Fees due in full, in US dollars, upon receipt of signed contract or deposit 
material, whichever comes first.  Thereafter, fees shall be subject to their 
current pricing, provided that such prices shall not increase by more than 
10% per year.


                                       8
<PAGE>

                                     EXHIBIT B

B1.  Product Name:____________________________________________________________
     Version #:_______________________________________________________________
Prepared/Confirmed by:________________________________________________________
Title:___________________________________      Date:__________________________
Signature:____________________________________________________________________
Type of deposit:
     ____ Initial Deposit
     ____ Update Deposit to replace current deposits
     ____ Other (please describe)_____________________________________________

ITEMS DEPOSITED:
     Quantity    Media Type    Description of Material

A)   ________    ____________  _______________________________________________

B)   ________    ____________  _______________________________________________

C)   ________    ____________  _______________________________________________


B2.  Product Name:____________________________________________________________
     Version #:_______________________________________________________________
Prepared/Confirmed by:________________________________________________________
Title:___________________________________      Date:__________________________
Signature:____________________________________________________________________
     Type of deposit:
     ____ Initial Deposit
     ____ Update Deposit to replace current deposits
     ____ Other (please describe)_____________________________________________

ITEMS DEPOSITED:
     Quantity    Media Type   Description of Material

A)   ________    ____________  _______________________________________________

B)   ________    ____________  _______________________________________________

C)   ________    ____________  _______________________________________________


                                       9
<PAGE>

                                     EXHIBIT C

                                     Licensees

Please list a primary contact person, company names, and address, as well as
telephone and facsimile numbers.

COMPANY NAME & ADDRESS

A.____________________________          Contact Name:____________________

______________________________          Telephone:_______________________

______________________________          Facsimile:_______________________

______________________________          Date:____________________________

Product Name and Version #_____________________________________

B.____________________________          Contact Name:____________________

______________________________          Telephone:_______________________

______________________________          Facsimile:_______________________

______________________________          Date:____________________________

Product Name and Version #______________________________________

C.____________________________          Contact Name:____________________

______________________________          Telephone:_______________________

______________________________          Facsimile:_______________________

______________________________          Date:____________________________

Product Name and Version #______________________________________


                          (PLEASE COPY PAGE AS NECESSARY)


                                      10
<PAGE>

                                 FIRST AMENDMENT TO
                              MASTER ESCROW AGREEMENT

     This First Amendment to Master Escrow Agreement (the "Agreement") is made
to that certain Master Escrow Agreement dated February 1995 (the "master Escrow
Agreement"), between Fort Knox Escrow Services, Inc. ("Fort Knox"), and ActaMed
Corp. (the "Producer"), to provide certain amended or revised terms to the
Master Escrow Agreement.  The Master Escrow Agreement and this Amendment
together constitute the "Agreement" referred to in the Master Escrow Agreement.
All capitalized terms used in this Amendment and not defined herein have the
meaning provided for in the Master Escrow Agreement.  In the event of any
conflict between the terms of this Amendment and the terms of the Master Escrow
Agreement, the terms of this Amendment shall govern and control.

     In consideration of the sum of Ten Dollars ($10.00) in hand resolved, and
other good and valuable considerations, the receipt and adequacy of which is
hereby acknowledged, the parties hereby do agree as follows:

     Section 4.1(b)(i) of the Master Escrow Agreement is deleted in its entirety
and the following is substituted thereafter:

     (I)  written notification that Producer has failed in material respects to
          support the applicable Systems as required by a valid and existing
          License Agreement ("License Agreement") between Licensee and Producer,
          or that the terms of any other agreement to which Producer and
          Licensee are a party provides that Licensee is entitled to receive the
          Deposit Materials, or that Producer has ceased the business of
          supporting the applicable Systems ("Producer Default");

     IN WITNESS WHEREOF, each of the parties has caused this Amendment to be
executed in duplicate originals by its duly authorized representative.

Fort Knox Escrow Services, Inc.         ActaMed Corporation

By: /s/ Jane L. Elliott            By: /s/ Nancy J. Ham
   --------------------------         -------------------------------

Name: Jane L. Elliott              Name: Nancy J. Ham
     ------------------------           -----------------------------

Title: Senior Account Manager      Title: CFO
      -----------------------            ----------------------------

Date: 9/27/95                      Date: 9/27/95
     ------------------------           -----------------------------


<PAGE>

                                     EXHIBIT F

                          MAINTENANCE AND SUPPORT SERVICES

ActaMed will provide United HealthCare Corporation with the following hardware,
network and application (product) maintenance services which will be performed
by ActaMed staff not dedicated to UHC enhancements.  The cost of these
maintenance services are provided as a part of the transaction and site fees,
and include:


- -    Correction of identified system bugs in the network hardware or
     application;

- -    Changes and modifications to the ActaMed hardware, application and network
     required to manage scalability and capacity issues associated with
     increased transaction volumes;

- -    Changes required to maintain service level commitments as identified in
     Exhibit I;

- -    Help Desk services as defined in Exhibit I, including appropriate staffing,
     call response time, escalation procedures, reporting, availability,
     severity levels, problem log tracking and problem resolution, etc;

- -    Maintaining the ORBIT system and accurately performing the provider
     registration process on ORBIT to include the assignment of Site and Tax
     ID's;

- -    User Security set up and processing;

- -    Marketing Group Product Support for maintenance of a COMPUTERIZED DEFECT
     CONTROL SYSTEM problem log to include ongoing discussions between the Help
     Desk personnel and the ActaMed development staff to communicate customer
     needs and reactions to daily activity;

- -    Plan Rep Training for all current and future owned or managed plans as well
     as UHC corporate staff;

- -    Plan Rep and Corporate training will be conducted at ActaMed locations
     unless alternate locations are mutually agreed upon by both parties.

- -    Maintenance, monitoring and reporting of network and communication systems
     regarding stability and performance as specified in Exhibit D;


                                                                          F 1
<PAGE>

- -    Multi-Payor and Vendor technical and administrative support to insure
     collection and transmission of maximum volumes of electronic claims to UHC;
     Infrastructure will be upgraded by ActaMed as needed to accommodate
     provider transactions to UHC;

- -    Maintenance of appropriate connectivity to UHC host systems to maintain
     security provisions and data integrity of UHC transactions;

- -    Administer and maintain license agreement procedures with providers
     assuring appropriate signatures and approvals from UHC providers;

- -    Provide routine, updated application and network documentation for UHC
     sites and corporate;

- -    Maintain the network and application to assure data integrity of
     transactions;

- -    Maintenance releases shall be defined to include any emergency releases
     issued by ActaMed;

- -    Technology upgrades to the ActaMed hardware, network, and/or application
     (to include such things as fault tolerance products and services) will be
     included as part of ongoing maintenance;

- -    Provide ongoing support of and communication with the health plan
     representatives on electronic commerce issues, targets and strategies;

- -    Provide monthly billing detail by health plan, and in the aggregate, for
     all transaction activity.

- -    The following list of projects are "maintenance" and are part of the
     general support activities provided by ActaMed:

     1.   TCP/IP socket interface to ESN
     2.   Claim Batch Processing (CPB) - Report Generation Redesign
     3.   TALX Voice Response system support
     4.   Identification of health plans by payer ID
     5.   Menu navigation and file transfer
     6.   Accept physician claims using HCFA NSF 2.0 format



                                                                          F 2
<PAGE>

                                     EXHIBIT G

                           ACTAMED PROVIDERLINK SECURITY

FUNCTION OBJECTIVE
To provide adequate data security given the confidential nature of the data and
the types of transactions performed on the ActaMed ProviderLink network.

Security related to ActaMeds ProviderLink is made up of multiple components: 
[*].  This document will concentrate on workstation and network security.

FUNCTION FEATURES

DATA OWNERSHIP
The ActaMed ProviderLink network is a system that enables communication between
a health care provider's place of business and payer host systems.  While the
ActaMed ProviderLink network enables the flow of data between these entities, it
"owns" none of the data.

[*]
ActaMed ProviderLink [*].  [*] by the ActaMed ProviderLink network [*].  A [*]
when installing the ActaMed ProviderLink application software.  In [*] 
ProviderLink, this consisted of [*].  With [*] the ActaMed ProviderLink 
application, [*].  The [*] then [*] ActaMed ProviderLink application [*].

A [*] is used [*] to [*].  When the ActaMed ProviderLink application software 
[*].  It is the responsibility of [*] and the [*].  This allows [*] who [*] 
of ActaMeds ProviderLink.  The [*] is [*] with all [*] the ActaMed's 
ProviderLink network, but only [*] is [*].

[*]
The ActaMed ProviderLink [*] to manage security. ActaMed [*] will [*].  
When [*] the [*] can perform and [*] that

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                          G 1
<PAGE>

the [*] are granted.  The [*] also [*] with some of the [*] ActaMed's 
ProviderLink.

The ActaMed ProviderLink [*] makes a [*] with [*] the ActaMed ProviderLink 
network.  The [*] will return [*] requested transaction [*].

In addition, the [*] that make up the ActaMed ProviderLink [*] use a [*] to 
control access. Each [*] call will [*] as part of [*].  In this manner, we [*]
to a [*] in effect, if you know the [*] of the ActaMed ProviderLink [*] 
you still cannot [*].

[*]
In general, [*] is [*] to the [*].  As necessary, the ActaMed ProviderLink [*]
will provide [*] to satisfy the [*].

In the case of [*] ActaMed ProviderLink [*].  Also associated with each [*] 
are [*].  When transactions are performed to [*] the [*] then the [*].  For 
[*] transactions (referrals, claim status, etc.), the [*].

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                          G 2
<PAGE>

                                 ACTALINK SECURITY

FUNCTION OBJECTIVE
To provide adequate data security given the confidential nature of the data and
the types of transactions performed on the ActaLink network.

FUNCTION FEATURES

[*]
ActaLink is a distributed database system which operates as if it were
centralized.  It implements an [*] in a [*].  It supports operations that 
make it [*].  The user need not be concerned with [*].

[*] a given user is provided with a [*] the information in the system is [*]. 
[*] all of the details for [*].  The [*] is a set of [*].

The [*] of the detailed information [*].  The [*] of the database system 
makes [*] and intuitive, a [*].

[*]
[*] have [*].  The [*] for [*] at a [*].  Once a [*] the network [*] who 
must [*] with a [*] for that purpose.  From that time onward, until the end 
of the [*] the [*] must be used by the individual [*].

All [*] and [*] is managed [*].

[*]
All ActaLink [*] wherever [*] become the [*].  This [*] which network 
users are [*] ActaLink [*].  ActaMed provides [*] and [*] that are used only 
for the [*].  The [*] uses this [*] to access ActaLink through [*].

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                          G 3
<PAGE>

The [*] does not have ActaLink [*] so the local [*] must use a different 
account for personal ActaLink network access.  This reduces the probability 
that [*] could walk up to [*] and grant [*] without [*].

A given ActaLink [*] may be [*] a variety of [*] but only if [*] have [*]. 
Accordingly, a physician can [*] at [*] as [*] assuming that [*].  This [*] 
can be granted with [*].

[*]
When a [*] the [*] is [*] and the [*] is returned to [*].  The [*] 
determines which [*] to be [*] to the user [*] and uses [*] to prevent [*] 
from [*].  The [*] only presents the user with [*].

[*]
The ActaLink [*] is composed of [*] may [*] information in ActaLink [*].

All access to [*] in the ActaLink system [*] are [*].  The only method of [*] 
is through the ActaLink [*].  A [*] to the [*] governed by [*].

[*]
The [*] of using particular [*] to each [*].  This permits the [*] to 
allow [*] and [*] allowing some [*].  [*] correspond to [*] each of which 
[*].  As stated in the [*] this [*] is accomplished by [*] to the user.

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                          G 4
<PAGE>

                                     EXHIBIT H

                              TRANSACTION DEFINITIONS


[*] and [*] allow a user to [*] and [*] to the [*].

[*] which allows a user to [*].

[*] which allows a user to [*] about the [*] and their [*].  A user can also 
[*] if available.

[*] which allows a user to [*] for [*].

[*] which allows a user to [*].

[*] which allows a user to [*].

[*] allow [*].

[*] which allows a user to [*].

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                          H
<PAGE>

                                     EXHIBIT I

                               PERFORMANCE STANDARDS
                                        AND
                               METHODS OF MEASUREMENT


NETWORK AVAILABILITY

The network will be available 24 hours a day, 7 days a week with the exception
of scheduled downtime.

- -    During this time, ActaMed will achieve the following performance standards:

     *    [*] of the time or better, hardware and modems will be operational and
          available for receiving/accepting calls.  Hardware specifically
          includes the ActaMed UNIX machines and the modems attached to the
          hardware.  Measurement will be weekly with reporting monthly.

     *    [*] or better successful modem connectivity, until 30 days after the
          network is moved and is under the complete control of ActaMed, at
          which time [*] or better successful modem connection performance will
          be required.  Of the calls attempted, ActaMed's bank of modems will
          negotiate a successful connection and offer service [*] of the time.
          This measurement will be based on statistics generated by the HDMS
          modem rack network controller and will be measured weekly with
          reporting monthly.

     *    [*] or better of transactions will be successful.  Of the transactions
          submitted to ActaMed, [*] of these will be successfully serviced.
          Measurement will be weekly with reporting monthly.

The definition for transaction success will be those transactions that do not
result in a system generated, non-user created error.  They may be categorized
into the following:

- -    transactions that return valid data

- -    transactions that return a meaningful message, but not an error (i.e. "Name
     not found" when performing an eligibility inquiry by name.)

- -    transactions returning an error based on the information received (i.e.
     "Unknown Request Format" which indicates an incorrectly formatted
     transaction.)

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                          I 1
<PAGE>

Transaction failures are defined as those transactions that fail due to a system
component failure (i.e. "Internal DCE Error" which identifies that a service
necessary to complete the transaction was not available).  Transaction failures
will be recorded and measured according to the standards described above.


AVAILABILITY MEASUREMENT

Availability is measured as the number of ACTUAL hours available as a percentage
of total AVAILABLE hours.  Planned systems downtime is NOT included in the total
availability time.  The following definitions are used for calculating the
availability measurement:

- -    DEFINED HOURS are the total days in the month multiplied by 24 hours.

- -    PLANNED HOURS are the planned and published hours that any system is down
     for maintenance or other planned outages.

- -    AVAILABLE HOURS are the Defined Hours minus the Planned Hours.

- -    UNPLANNED HOURS are the unplanned hours of downtime experienced during the
     month.

- -    ACTUAL HOURS are the Available Hours minus the Unplanned Hours.

- -    AVAILABILITY PERCENTAGE is determined by dividing the Actual Hours by
     Available Hours and multiplying the result by 100.

- -    CONNECTIVITY PERCENTAGE is determined by dividing the Total Successful
     Calls to the system by the Total Attempted Calls and multiplying the result
     by 100.

UHC will consider these performance standards achieved if the network
availability described above is achieved [*] of the time, or better.  UHC will
consider less than [*] performance achievement within [*] of any
consecutive [*] period to be a material breach of this Service Level
Agreement.

Reporting as identified in Exhibit D will be the source documents from which
these standards will be measured.  Compliance to these standards will be
determined by UHC upon reviewing the reports provided to the UHC/ActaMed
liaison.

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                          I 2
<PAGE>

In the event that ActaMed cannot perform according to the standards because of
emergent situations.  UHC will be notified following the emergency procedures
outlined in this document.

Reports on performance are due to UHC by no later than the 10th working day
following the end of the month.


LABORLINK SYSTEM

ActaMed will continue to support the batch processing of Allinas LaborLink
system, at the level of performance required for the ActaMed ProviderLink
network.  ActaMed will deliver files to the Third Party Administrator's (TPA)
mailboxes as soon as UHC uploads the files to the network, usually available by
8:00 a.m. every Monday, which allows reports to be released to TPA's by noon on
Monday, fifty-two weeks a year.


DATA INTEGRITY

ActaMed will uphold the highest standard of integrity with regard to the
transmission and processing of transactions, reporting performance and service.
Information received from ActaMed will be correct, and without errors, [*] of
the time, measured monthly, unless otherwise stated in the SLA.

All updates from COSMOS or other UHC host systems will be promptly and correctly
applied [*] of the time.


ACTAMED PROVIDERLINK HELP DESK

Users, UHC health plans and business units agree to call the ActaMed
ProviderLink Help Desk at 612-945-8500 or 1-800-446-8279 for all problem
resolution when concerns cannot be resolved by the Health Plan, or a Health Plan
representative is not available.  The ActaMed ProviderLink Help Desk will be
open from 7:00 a.m. - 5:00 p.m. CST, Monday through Friday.  Voice mail is
available for after hour calls.  Messages left on voice mail after business
hours will be retrieved the following business day.

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                          I 3
<PAGE>

CALL DOCUMENTATION

Utilizing the ActaMed ProviderLink Help Desk computerized problem management
tool, the following information will be recorded on each call to the help desk:

Site ID (PC ID)     Site Name                Caller Name         Phone Number
Health Plan         Priority Level           Date of Call        Time of Call
Problem Code        Call Recipient           Problem Definition
Call Status         Resolution Information

The ActaMed ProviderLink Help Desk will attempt to accommodate any requests for
additional information as long as the collection of the information does not add
significant time and effort in logging the call.  The ActaMed ProviderLink Help
Desk statistics will be reported to UHC on a routine basis but will not be
integrated into any individual health plan's call tracking statistics.


DEFINITION OF THE PRIORITY LEVEL CLASSIFICATIONS

All calls will be assigned to one of three priority levels.  The following
definitions will be used by the ActaMed ProviderLink Help Desk Representatives
to assign priority to calls:

SEVERITY 1 - A critical system or component is down or experiencing degraded
service causing UHC's or a customer's business functions to be halted

SEVERITY 2 - A single user is down, a component is experiencing degraded
service, or scheduled deliverables are unavailable.  This does not have a
critical impact on the business, but may restrict function to some users and may
impact normal business operations.

SEVERITY 3 - A user's system is still operating but is experiencing difficulties
or a specially requested deliverable is unavailable.

The definition of each priority level and the classification of call types into
priority levels will be determined through negotiation between ActaMed and UHC. 
The definitions may be reassessed and are subject to change.  The ActaMed
ProviderLink Help Desk's method of classifying calls into priority levels will
be reviewed periodically with UHC.  UHC will be responsible for defining
additional situations and communicating to ActaMed any requests on how to
classify particular call situations.


                                                                             14
<PAGE>

In the event that the ActaMed ProviderLink Help Desk computerized on-line
problem management tool is down, call information will be recorded manually and
entered into the system when it becomes available.


MEASUREMENT

Objectives have been set for both the maximum time required for communicating
the current status and action plan to the user and to UHC for each priority
level and for the percentage of call volumes that will meet these objectives.

Measurement will begin when the problem is received by the ActaMed ProviderLink
Help Desk and recorded into the computerized on-line problem management tool. 
Measurement will end when the call is closed, (i.e. the current status and
action plan is communicated to the user and the appropriate UHC health plan has
acknowledged the problem) by the ActaMed ProviderLink Help Desk representative. 
It is the responsibility of the UHC health plan personnel to notify ActaMed
ProviderLink Help Desk when an open call has been resolved by a health plan
resource, but not communicated to ActaMed by the user.

The percent of calls closed within the time frame objectives will be measured by
calculating, by priority level, the volume of calls closed within the time frame
objectives as a percentage of total calls opened.


SALES, INSTALLATION AND TRAINING

When selling ProviderLink, UHC will ensure that the users conform to the
technical standards that have been established in the current version of
Schedule B of the ProviderLink License Agreement.  UHC will continue to follow
ProviderLink approved installation procedures and will provide an adequate level
of user understanding of ProviderLink through appropriate training.

The ProviderLink health plan representatives will be trained by ActaMed as
described in Exhibit F. UHC recognizes that the quality of ActaMed's
ProviderLink Help Desk support is partially dependent on UHC's sales and
installation to sites with approved technical requirements and thorough training
of users.


CAPACITY PLANNING

UHC is responsible for providing the ActaMed's ProviderLink Help Desk with as
much information as possible to assist ActaMed in planning for the appropriate
levels of staffing to meet the service level objectives.  Forecasts of site
sales,


                                                                             15
<PAGE>

installation scheduling and specific events that will impact ActaMed's
ProviderLink volume of calls will be communicated to the best of UHC's ability. 
Major support requirements will be communicated with a 90 day lead time,
whenever possible.


TECHNICAL MAINTENANCE/ENHANCEMENT SCHEDULING OBJECTIVES

PDR (PROVIDERLINK DEVELOPMENT REQUEST) PROCESS

ActaMed will have an established process for documenting all ProviderLink user
requests for correction of problems or the development of new functionality. 
All requests are recorded into a computerized defect control system software
product including a detailed description of the requirements.  All regular open
requests are reviewed by the ActaMed ProviderLink development team on a routine
basis, however, UHC will be responsible for establishing the development
priorities.  ActaMed assumes the responsibility to make the development and
maintenance modifications based on UHC priorities.

DURING THE TRANSITION, ACTAMED PROVIDERLINK PRODUCT MARKETING WILL AID AND
CONTRIBUTE TO THE PRIORITIZATION OF UHC REQUESTS IF NEEDED.  FOLLOWING THE
TRANSITION PERIOD, ACTAMED WILL CONSIDER THIS ASSISTANCE A LONG TERM BILLABLE
SERVICE.

NETWORK MAINTENANCE RELEASES

Regular ProviderLink network maintenance enhancements and fixes will be
completed and certified on a regular basis.  They will be released into
production on Thursday evenings, AS AVAILABLE.  Major software and hardware
releases will be scheduled to go into production on weekends.  ActaMed will
communicate these changes to UHC on a regular, weekly basis.


EMERGENCY MAINTENANCE RELEASES

Emergency maintenance is defined as the correction of a technical bug or
omission in the existing functionality of ActaMed's ProviderLink presentation
software or network.  The technical problem renders the ProviderLink feature or
user inoperable.

ActaMed will be responsible for ongoing monitoring and quality control of the
network and application.  UHC will expect ActaMed to have a well defined problem
identification procedure to document and fix inoperable functionality before
recognized by UHC or its users.  However, when this has not been


                                                                             16

<PAGE>

accomplished, UHC will in cooperation with an ActaMed staff resource, 
complete a PDR with as much information as is available, designate it as 
emergency, and submit it to the ActaMed ProviderLink Product Marketing staff. 
The UHC/ActaMed liaison is responsible for supporting ActaMed with the 
initial research and documentation of the problem via the PDR.

The service level performance objective for emergency correction will be within
ten business days.  Tracking of the fix will begin at the time of ActaMed's
receipt of the PDR.  Emergency changes will be released on any given day.  These
releases are not subject to the Thursday release schedule.

The correction of the emergency technical problem will be in the control of the
ActaMed development team.  ActaMed is not responsible for correcting problems
located outside of the ActaMed ProviderLink presentation software or network,
i.e. a specific user's configuration, hardware problems, or technical problems
located within another vendor's software.


APPLICATION MAINTENANCE RELEASES

Application Maintenance releases will include maintenance and fixes of
presentation software bugs identified and documented in the PDR process.  A
software bug is defined as existing functionality that fails to perform as
designed.

Where applicable, it will be the responsibility of UHC to assist
ActaMed/ProviderLink development in thoroughly researching user needs and
determining the implication of product changes on all stakeholders within United
HealthCare and ProviderLink end users.

The registration, installation and training of ProviderLink users on the
features of any maintenance release is the primary responsibility of UHC.


ENHANCEMENT RELEASES

All enhancements to the ActaMed ProviderLink software or network will be
provided to UHC health plans or affiliates as outlined in the Service Level
Agreement.  Enhancements are defined as the addition of functionality that does
not currently exist in the ProviderLink system, or is currently not supported. 
In addition, these releases may include maintenance and fixes of presentation or
other software bugs not included in the routine application maintenance
releases.

An enhancement release may also include modifications to any or all of the
current ProviderLink features of Claim Submissions, Eligibility, Referrals,
Referral Status, Claims Status, ProviderLink E-mail/Fax, and Provider Directory.


                                                                             17
<PAGE>

Enhancements specific to UHC, and those created exclusively for UHC by the
ActaMed/UHC dedicated team, will be released according to the agreed upon
schedule.  Information specific to the dedicated team and enhancements paid for
by UHC, will be outlined in the Dedicated Team Agreement.

It is the responsibility of UHC to assist ActaMed/ProviderLink development in
thoroughly researching user needs and determining the implication of product
enhancements on all stakeholders within United HealthCare and ProviderLink end
users.

The registration, installation and training of ProviderLink users on the
features of any new release is the primary responsibility of UHC.  All requests
for the development of enhancements in functionality will be communicated to
ActaMed through the PDR process.


COMMUNICATION OF TECHNICAL REQUIREMENTS

The ActaMed ProviderLink development team will formally communicate to UHC's
health plan ProviderLink Managers, 90 days prior to release date, any
anticipated changes in standard hardware requirements, as defined in the current
version of schedule B of the ProviderLink License Agreement, that would impact
UHC's users of new ProviderLink software releases.


PLANNING FOR THE YEAR 2000

ActaMed will plan for, and successfully implement, changes to all applications
and network tools and services to accommodate the transition to the year 2000. 
ActaMed will perform this task on internal software as part of the maintenance
agreement with UHC and will be done at no extra cost.  If UHC data formats
change as a result of adding support for the year 2000, UHC will prioritize this
exclusive change for ActaMed and submit the change request for completion by the
UHC dedicated team.


                                                                             18
<PAGE>


ALLINA SERVICE LEVEL AGREEMENT (SLA)

ActaMed will perform to the level of service described in the 1996 agreement
negotiated with Allina by the UHC EDI Services Department through the duration
of the 1996 calendar year.


                                                                             19

<PAGE>

                                  EXHIBIT J

                          UHC Operating Environment

(a)  [*] will provide [*] between ActaMed and [*].

(b)  [*] will provide [*] between [*].

(c)  [*] will provide [*].  UHC will provide [*] the communications 
     between ActaMed and [*].

(d)  [*] may [*] as appropriate [*].

ATTACHED DIAGRAMS:

In the first diagram, labeled Attachment 1, the division of responsibility is 
identified by the vertical line.  This division of responsibility is depicted 
in more detail by the second diagram, labeled 'ProviderLink Architecture'.  
In the second diagram, the cloud which represents [*] at the bottom of the 
page [*] are the responsibility of [*].  The [*] to connect the [*].

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                                                             20

<PAGE>

                                                                EXHIBIT K

                                                              EMC CONTRACTS
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
 VENDOR                           CONTRACT       RENEWAL        PRODUCTION   FEES PER CLAIM               CHARGE TO PROVIDER
                                  DATE           DATE           DATE
- ------------------------------------------------------------------------------------------------------------------------------------
 <S>                             <C>             <C>            <C>          <C>                          <C>

[*]

</TABLE>

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.







<PAGE>

               CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED 
          AND FILED SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT 
               HAS BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.


                                 SERVICES AGREEMENT


            This SERVICES AGREEMENT (the "Services Agreement" or "Agreement")
is made and entered into as of December 31, 1997 by and between ACTAMED
CORPORATION, a Georgia Corporation ("ActaMed") and SMITHKLINE BEECHAM CLINICAL
LABORATORIES, INC., a Delaware Corporation ("SBCL").
                                          
                                     BACKGROUND

            ActaMed is in the business of providing electronic data interchange
products and services to the health care industry, including its ProviderLink
software, and desires to develop business involving automated laboratory order
entry and results reporting  services.

            SBCL provides laboratory testing services to certain Providers 
who use SBCL Software (as defined in the License Agreement) for electronic 
clinical laboratory test order entry and/or test result reporting between an 
SBCL Lab and such Provider.  In addition, SBCL uses the SBCL Software to 
allow [*] to send laboratory test orders entered electronically to an SBCL 
Lab and/or to have the test results reported electronically back to the PSC 
or the Provider ordering the test.

            The parties previously entered into the Development Agreement
pursuant to which ActaMed and SBCL are jointly developing the ActaLab Software.

            Simultaneously with the execution of this Agreement, ActaMed and
SBCL are entering into the Purchase Agreement pursuant to which ActaMed is
purchasing and SBCL is selling certain assets associated with SBCL's provision
of Lab EDI Services, as more fully set forth therein.  Also concurrently with
the execution and delivery of this Agreement, SBCL and ActaMed are entering into
the License Agreement whereby SBCL, among other things, grants ActaMed a license
to the SBCL Software.  This Agreement sets forth the parties' agreements
relating to their rights and obligations following the date hereof relating to
provision of Lab EDI Services to Automated Providers.

            Pursuant to the Purchase Agreement, the Parties contemplate that
there will be a staged transfer to ActaMed of SCAN Assets. The transfer of
Region One SCAN Assets is to occur on the Region One Transfer Date.  The
transfer of the other Regions will occur sequentially when the Transfer
Benchmarks (as defined in the Purchase Agreement) have been met. 

            NOW THEREFORE, in consideration of the premises and the mutual
promises contained herein, the parties, intending to be legally bound, agree as
follows:


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

<PAGE>

I.     DEFINITIONS.

       Capitalized terms used in this Agreement and not otherwise defined
herein are defined in EXHIBIT A attached hereto.

II.    NETWORK READINESS SERVICES.

       A.   GATEWAY REPLICATION.  SBCL shall be responsible [*] to provide 
such reasonable and appropriate software development, installation and 
support services as are necessary to establish connectivity with an ActaMed 
gateway  (the "ACTAMED GATEWAY") that works substantially as the SBCL gateway 
works as of the date hereof.  In connection with such services from SBCL: 

            1.   ActaMed shall [*] order, acquire, install and configure 
the necessary hardware and data communications lines required to install and 
operate the appropriate gateway systems, including without limitation a [*] 
modems, 800 phone service, [*] and data communications lines for connection 
to SBCL systems.  SBCL will provide specifications and guidance to assist 
ActaMed in this effort.

            2.   SBCL will install the gateway software on ActaMed's computer
and modify the gateway software as necessary to cause it to communicate with the
SBCL systems.  At SBCL's determination, this may include new enhancements or
additional software as needed to allow the ActaMed Gateway to transmit
Transmittal Information for Automated Providers using the SCAN Network.

            3.   At such time as the ActaMed Gateway has been adequately (in
SBCL's determination) tested, including for compliance with applicable SBCL
internal standards and using SBCL sample clinical laboratory test orders and/or
test result report data, in which testing ActaMed and SBCL shall cooperate, SBCL
shall so notify ActaMed.  For a period of up to thirty (30) days after the date
of such notice, ActaMed shall be entitled to perform such quality assurance
testing as it shall reasonably deem appropriate.  SBCL shall provide reasonable
assistance to ActaMed in this process.  If the system is not performing
substantially the same as SBCL's gateway and as necessary to enable ActaMed to
meet the Key Performance Standards and to provide the Lab EDI Services using the
ActaMed Gateway, ActaMed shall provide timely notice to SBCL of such deficiency
or performance problem within such thirty (30) day period.  SBCL shall supply
the appropriate personnel to investigate and correct any such reported
deficiencies or performance problems. The acceptance period shall be extended to
two (2) weeks beyond the time of such correction.  When corrected to the
reasonable satisfaction of ActaMed and SBCL, or if SBCL is notified of no
further deficiencies or performance problems within such period, the ActaMed
Gateway shall be deemed ready and accepted by ActaMed.

            4.   SBCL will provide reasonable training of ActaMed personnel and
any available documentation to allow ActaMed to operate and support its gateway
independently; 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -2-
<PAGE>

provided that SBCL will not provide [*] or other base-line training that may 
be required by ActaMed.  

            5.   The foregoing procedures of this Section II.A shall be
completed within one hundred twenty (120) days after the date hereof.

            6.   After acceptance of the ActaMed Gateway and until [*] SBCL 
shall, at ActaMed's written request, provide such maintenance and related 
support to the ActaMed Gateway as may be necessary to continue its effective 
operation at substantially the same performance levels as SBCL experienced on 
its gateway immediately prior to the date hereof.  SBCL shall charge ActaMed 
for such services at the then industry standard rates for similar services.  
After [*] (i) SBCL makes no representation or warranty as to the performance 
of the ActaMed Gateway software systems so established by SBCL hereunder; and 
(ii) ActaMed may request SBCL to provide such support and, if SBCL elects to 
provide such support, SBCL may charge ActaMed for such services at the then 
industry standard rates for similar services.

       B.   MIGRATION PERIOD.  After the Transfer Date of a Region,  SBCL and
ActaMed shall have the following obligations with respect to SBCL Sites
transferred to ActaMed in that Region:

            1.   ACTAMED TO MIGRATE SITES.  ActaMed will use its good faith
efforts to migrate the SBCL Sites so transferred from communicating with the
SBCL gateway to communicating with the ActaMed Gateway as soon as practicable,
and shall similarly use its best efforts, and take all steps reasonably
necessary, to assign financial responsibility or otherwise change the billing of
dedicated phone lines installed in Automated Providers' offices for Lab EDI
Services from SBCL over to ActaMed.  SBCL will support ActaMed in ActaMed's
efforts to transfer the local phone lines to ActaMed's account and, subject to
ActaMed's obligation under Section II.B.7.(g) hereof, pay any charges,
assessments, fees or other amounts incurred by SBCL for such transfer.

            2.   EDI AGREEMENT AMENDMENTS.  ActaMed shall obtain signed
amendments to any existing CIS Agreement between a Provider and SBCL or a new
CIS Agreement between the Provider and ActaMed containing the provisions set
forth in EXHIBIT II.B.2(a).  SBCL shall obtain a signed agreement from such
Provider for Lab EDI Services by ActaMed in the form of EXHIBIT II.B.2(b). 

            3.   ASSISTANCE FROM SBCL.  SBCL will make available to ActaMed 
such resources as SBCL determines is reasonable and appropriate for the 
transfer of each Region, at no cost to ActaMed.  After the earlier of (i) [*] 
after the Transfer Date for a particular Region or (ii) the full migration of 
SBCL Sites in such Region from communication with the SBCL gateway to 
communication with the ActaMed Gateway, SBCL will continue to use its good 
faith efforts to make such resources available to ActaMed and may charge 
ActaMed therefor at then industry standard rates for similar services.

            4.   SUPPORT SERVICES.  From time to time prior to the [*]


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -3-
<PAGE>

                 a.   ActaMed may request that SBCL's [*] provide services 
to ActaMed in [*] to assist ActaMed in the delivery of items relating to 
ActaMed's delivery of Lab EDI Services to Automated Providers (provided 
ActaMed delivers the item to [*] for such delivery to the Automated 
Provider), such services to be provided consistently with the manner and 
extent to which SBCL has used such [*] during the twelve (12) month period 
prior to the Transfer Date of the Region in [*] is located.  SBCL shall 
direct its [*] to provide such services provided that SBCL shall not be 
responsible for any Losses incurred as a result of providing such services.  
Nothing in this Section III.B.4 shall require SBCL, ActaMed or [*] to provide 
any service if to do so would cause any party, including [*] to violate any 
Regulation.

                 b.   SBCL may request that ActaMed's employees provide 
services to SBCL in the course of their normal duties to assist SBCL in the 
delivery of items (E.G., [*]) to Automated Providers (provided SBCL delivers 
the item to the employee for such delivery to the Automated Provider), such 
services to be provided consistently with the manner and extent to which SBCL 
has used employees for such purposes during the twelve (12) month period 
prior to the Transfer Date of the Region in which such employee works.  
ActaMed shall direct its employees to provide such services provided that 
ActaMed shall not be responsible for any Losses incurred as a result of 
providing such services.  Nothing in this Section III.B.4 shall require 
ActaMed, SBCL or such employee to provide any service if to do so would cause 
any party, including the respective employee, to violate any Regulation.

            5.   USE OF SBCL FACILITIES BY TRANSFERRED EMPLOYEES.  ActaMed 
will employ the Transferred Employees in accordance with the provisions of 
Article VI of the Asset Purchase Agreement.  From the Transfer Date of a 
Region until [*] after the Transfer Date of that Region, such Transferred 
Employees may continue to use such office space, office equipment, office 
telephones, office supplies, and have access to such office services as such 
Transferred Employees had immediately prior to the applicable Transfer Date 
(collectively, "OFFICE SPACE"), [*] whether or not such Transferred 
Employees are responsible for ActaMed Sites.  No employees of ActaMed other 
than the Transferred Employees currently assigned to such Office Space shall 
be allowed to use such Office Space, and ActaMed may not place signage inside 
or outside of such Office Space or use such Office Space for any operations 
other than the transition contemplated by this Section II and the provision 
by ActaMed of Lab EDI Services. 

            6.   SCAN NETWORK MAINTENANCE.  SBCL shall continue to have and
support Lab EDI Services between each SBCL Site and SBCL's gateway until
migration of such SBCL Site to the ActaMed Gateway is completed.  SBCL will
continue to operate and maintain its gateway systems for such purposes.  


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -4-
<PAGE>

            7.   ACTAMED PAYMENTS TO SBCL. In consideration of services
provided under this Agreement, ActaMed will pay SBCL the following amounts (in
addition to any other amounts which may be charged to ActaMed by SBCL as
expressly set forth in this Agreement):

                 a.   A fee in the amount of [*] per month for each month 
after the Region One Transfer Date (prorated for any portion thereof); 
provided that no payment shall be made under this clause a. either (i) if a 
payment is made under clause b. below, after the third month after the Region 
One Transfer Date, or (ii) if a payment is not made under clause b. below, 
after the Region Two Transfer Date.

                 b.   A fee in the amount of [*] for each month prior to the 
Region Two Transfer Date (prorated for portion thereof) commencing with the 
fourth month after the Region One Transfer Date, provided, however, that 
payment under this Section II.B.7.b shall not be made unless the delay in the 
Region Two Transfer Date beyond the date three (3) months after the Region 
One Transfer Date is due to ActaMed's failure to meet the Transfer Benchmarks 
(with any dispute with respect thereto to be resolved in accordance with 
Section XV hereof).

                 c.   A fee in the amount of [*] per month for each month 
after the Region Two Transfer Date (prorated for any portion thereof), 
provided that no payment shall be made under this clause c. after the Region 
Three Transfer Date;

                 d.   A fee in the amount of [*] per month after the Region 
Three Transfer Date (prorated for any portion thereof), provided that no 
payment shall be made under this clause d. after the Region Four Transfer 
Date;

                 e.   Until the date which is twelve (12) months after the 
Transfer Date of a Region, reimbursement for any local and long distance 
telecommunication services (including 800 and 888 service other than 800 and 
888 numbers used to [*]) billed to SBCL in respect of SBCL Sites in that 
Region;

                 f.   From and after the date which is twelve (12) months 
from the Transfer Date of a Region, an amount equal to [*] of the amount of 
any local and long distance telecommunication services (including 800 and 888 
service other than 800 and 888 numbers used to [*]) billed to SBCL in respect 
of SBCL Sites in that Region; and

                 g.   Reimbursement for [*] of any charges, assessments, fees 
or other amounts incurred by SBCL for the transfer of any dedicated phone 
lines installed in Automated Providers' offices for Lab EDI Services into the 
ActaMed name, including without limitation any transfer fees or new 
installation fees.

       C.   PAYMENT TERMS FOR ACTAMED PAYMENTS TO SBCL.  SBCL shall invoice 
ActaMed monthly for the services rendered by it and chargeable to, or to be 
reimbursed by, ActaMed pursuant to this Section II.  All amounts shown due on 
such invoice shall be paid within [*] after the date of the invoice.  Late 
payments shall be subject to a late fee equal to [*] per 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -5-
<PAGE>

month on the overdue amount.  In the event ActaMed disputes any amount shown 
due on such invoice, ActaMed shall pay timely any undisputed amounts and send 
a Dispute Notice to SBCL with respect to any disputed amounts.  For a period 
of thirty (30) days after the date of the Dispute Notice, ActaMed shall have 
Audit Rights with respect to the portions of SBCL's books and records that 
relate to the subject of the dispute.  In the event the parties are unable to 
resolve the disputed matter, the matter shall be resolved in accordance with 
Section XV hereof and application of any late fee to such disputed amount 
shall be tolled until conclusion of such proceedings and then applied only to 
the amount so determined to be due.

III.   SERVICES AFTER TRANSFER.

       A.   PLANNING AND OVERSIGHT COMMITTEE. On or promptly after the Region
One Transfer Date, SBCL and ActaMed will establish an Oversight Committee having
the obligations set forth in this Section III  (the "OVERSIGHT COMMITTEE"). The
parties may thereafter, in their respective sole discretion, change the
complement of the Oversight Committee, including without limitation to decrease
or increase the number of members on the Oversight Committee, so long as the
Oversight Committee shall continuously have equal numbers of persons
representing ActaMed and SBCL, provided that SBCL may appoint a majority of the
Oversight Committee members if ActaMed consents thereto. The Oversight Committee
shall continue in effect through the term of the Agreement (including any
applicable renewal period).  Each member of the Oversight Committee will have
responsibility to, among other things,

            1.   review the performance of ActaMed hereunder, as measured by
the Performance Standards, 

            2.   review the compliance of ActaMed with Regulations and report
to ActaMed and SBCL with respect to compliance matters,

            3.   discuss trends in the health care information services
industry and service type and quality offered by competitors of ActaMed,

            4.   exchange information regarding strategic needs and directions
of the respective ActaMed and SBCL businesses that are relevant to the
relationships contemplated by this Agreement,

            5.   exchange information about technological developments for
electronic connectivity in the health care information services industry,

            6.   provide feedback to ActaMed and SBCL regarding the
implementation and effect of ActaMed's preferred provider status pursuant to
Section VII of this Agreement,

            7.   notify SBCL, ActaMed and other members of the Oversight
Committee at any time such member has any knowledge that ActaMed has not
performed in accordance with the Performance Standards, and make recommendations
to ActaMed and SBCL as to remedying 

                                       -6-
<PAGE>

performance that does not comply with this Agreement, including without 
limitation the Performance Standards, and

            8.   examine and, collectively with the other members, report to
ActaMed and SBCL from time to time on ways in which Agreed Services can be
improved.   

       B.   AGREED SERVICES. ActaMed will provide the following services to
SBCL and Automated Providers at ActaMed Sites in accordance with the Performance
Standards and will take all reasonable and appropriate action to preserve the
Network and the goodwill of the Automated Providers utilizing such services:

            1.   NETWORK SUPPORT.  ActaMed shall maintain and support the
Network for Lab EDI Services between Automated Providers and an SBCL Lab and
shall ensure that the Network meets or exceeds all Network Standards.

            2.   INSTALLATION AND TRAINING. ActaMed will provide 
installation, set up and training services at all ActaMed Sites as reasonably 
necessary to enable such ActaMed Sites to utilize the Network accurately and 
efficiently.  In this connection, ActaMed will (i) install software, and if 
necessary and appropriate and consistent with contractual relationships 
between SBCL and ActaMed, hardware, (ii) confirm set up thereof, (iii) 
confirm the ability after set up to successfully transmit and receive modem 
communications with the applicable SBCL Lab and that requisitions and results 
functionality is accurate, and (iv) provide competent and timely training to 
the Automated Provider's personnel regarding Lab EDI Services.  Such 
installation, set up and training services shall be provided to, and 
connectivity to the Network established for, any Provider or PSC designated 
by SBCL.  If ActaMed identifies a Provider which is a potential new customer 
for Lab EDI Services, it shall so notify SBCL and SBCL shall determine if 
such installation, set up and training services shall be provided to such 
Provider.  SBCL and ActaMed shall [*] to establish [*] to provide guidance on 
[*] of ActaMed suggested Automated Providers.   Prior to any 
installation, set up and training services being rendered hereunder, SBCL and 
ActaMed shall have each entered into an agreement for such Lab EDI Services 
with such new customer which agreement shall contain the provisions set forth 
on EXHIBIT II.B.2(b).

            3.   SPECIAL SERVICES AT PIF SITES.  At up to [*] (the "PIF 
NUMBER") sites selected by SBCL prior to the [*] [*] where 
installation training and set up services are required (the "PIF SITES"), 
SBCL shall be entitled, by written request to ActaMed and payment of the [*] 
set forth in Section IV.B.2, to require that installation, set up and 
training services be provided on a top priority accelerated basis.

            4.   INITIAL ROLL OUT OF ACTALAB SOFTWARE.  After market launch of
the ActaLab Software (which shall be only after the ActaLab Software functions,
features and performance have been accepted by SBCL in accordance with the
Development Agreement and the requirement in this Agreement that it comply with
Regulations),  ActaMed will begin to replace the SCAN Software at ActaMed Sites
with the ActaLab Software in accordance with a roll out plan developed by
ActaMed 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -7-
<PAGE>

which shall be designed to deploy the ActaLab Software as quickly as 
practicable with minimal disruption to Automated Providers.  ActaMed shall 
submit the roll out plan to SBCL sufficiently in advance to allow SBCL 
reasonable opportunity to review and comment on the roll out plan prior to 
implementation, and shall use its good faith efforts to incorporate SBCL's 
comments thereon.  Such roll out, however, shall not be made to any Provider 
which has not executed an agreement containing the provisions set forth in 
EXHIBIT II.B.2(a) or (b).

            5.   CUSTOMER SUPPORT.  ActaMed will provide all reasonably
necessary and appropriate end user support for issues relating to connectivity
to the Network utilizing any Network Software in use at such time, including
without limitation, help desk assistance to Automated Providers, hardware
support to applicable Automated Providers, user training and bug fixes to the
Network.  All customer support services shall be performed in a competent and
professional manner meeting or exceeding generally accepted industry standards
for confidential EDI and will be rendered by qualified personnel who will
perform the tasks assigned consistently with good professional practice and the
state of the art involved.  SBCL shall have the right to request the removal
from Automated Providers accounts of any ActaMed personnel used by ActaMed to
perform customer support services, provided such objection would not constitute
unlawful discrimination, if SBCL becomes aware that such person is causing
customer dissatisfaction.  If an objection is raised by SBCL, ActaMed agrees to
confer with SBCL and endeavor to furnish a replacement as quickly as is
practicable. 

            6.   MONITORING.  ActaMed shall continuously monitor its
performance against the Performance Standards and shall notify SBCL at any time
when it fails to meet the Performance Standards.  SBCL shall similarly notify
ActaMed of any such failure, provided that the failure to notify shall not
constitute a waiver of SBCL's rights hereunder.  In the event that ActaMed fails
to meet any Performance Standard at any time, ActaMed shall promptly diagnose
the cause of the failure and shall work continuously and diligently to correct
such failure to perform until it is corrected.  Any failure to meet the
Performance Standards which occurs while ActaMed is working to remedy the
problem shall continue to be counted for the purposes of Section XII.B.1,
Section VII.B.4 and IV.F.

            7.   REPORTS.  ActaMed and SBCL will, at their own expense, provide
the other  with the reports specified on EXHIBIT III.B.7 hereto at the times
specified thereon.

       C.   PERFORMANCE STANDARDS.  "Performance Standards" shall mean the
Network Standards and the Customer Support Standards.  EXHIBIT III.C-1  to this
Agreement specifies the performance standards for the Network which must be
maintained and the applicable time periods for measuring compliance with such
standards (the "NETWORK STANDARDS").   EXHIBIT III.C-2 to this Agreement
specifies the customer support standards ActaMed must achieve and maintain and
the applicable time periods for measuring compliance with such standards (the
"CUSTOMER SUPPORT STANDARDS").  In no event shall the Performance Standards be
less than the comparable Network maintenance and support standards and services
ActaMed utilizes for or provides to its other customers receiving services
comparable to Lab EDI Services.  ActaMed shall have sixty (60) days following
the date 

                                       -8-
<PAGE>

hereof to validate the metric performance level set forth in the Performance 
Standards as representative of SBCL's provision of services which are now 
Agreed Services.  ActaMed shall perform the validation (with cooperation from 
and access to relevant records and data of SBCL) within such sixty (60) day 
period, and based upon the period of [*].  In the event that ActaMed's 
validation process yields a metric different from that set forth in the 
Performance Standards, a new metric for this Agreement shall be mutually 
agreed by SBCL and ActaMed, with any disputes with respect thereto resolved 
in accordance with Section XV hereof.

       D.   SBCL OBLIGATIONS.  SBCL shall have no obligation to provide any
support, training or maintenance services to Automated Providers, other than as
expressly set forth herein.

       E.   Records and Audits.  

            1.   ActaMed shall maintain accurate and complete records 
regarding the transmissions to and from Automated Providers and SBCL in 
accordance with accepted information storage practices in the clinical 
laboratories industry and in compliance with applicable Regulations, but in 
no event for less than [*] or such longer period as may be required by 
Regulations or the Integrity Agreement. 

            2.   The records maintained pursuant to Section III.E.1 above shall
include without limitation records of the amounts ActaMed charges SBCL under
this Agreement, with a system of audit trails, records and controls sufficient
to allow SBCL to audit such transactions and charges under this Agreement and to
assure satisfaction of any requirements imposed on SBCL by their external
auditors or on ActaMed or SBCL by government officials enforcing applicable
Regulations. 

            3.   In addition to the grant of Audit Rights pursuant to Sections
IV.B, IV.C.3 and VI.B of this Agreement, SBCL shall have the right, exercisable
not more often than twice in each calendar year for the first three years after
the date hereof, and once in each calendar year thereafter, to have any of its
agents or employees, who or which are reasonably acceptable to ActaMed, audit,
in accordance with the Audit Rights, the books and records of ActaMed relating
to such SBCL transactions to examine or determine the proper amounts which
should have been billed to SBCL, the amounts which were billed to SBCL, and the
amounts which SBCL has paid under this Agreement.  

            4.   In any exercise of Audit Rights hereunder, including without 
limitation pursuant to Section III.E.3, SBCL shall give ActaMed two week's 
prior notice of any such audit, and shall abide by reasonable ActaMed 
security and confidentiality procedures during the audit.  SBCL and ActaMed 
shall each bear their own costs associated with such audit, provided that in 
the event the audit determines that ActaMed has overcharged SBCL by more than 
ten percent (10%) of the amount properly due ActaMed in any month, ActaMed 
shall pay all costs of such audit.  If the audit reveals an overpayment by 
SBCL to ActaMed, ActaMed shall promptly refund such overpayment to 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -9-
<PAGE>

SBCL.  If the audit reveals an underpayment by SBCL, SBCL shall promptly pay 
to ActaMed the amount of such underpayment.

IV.    PAYMENTS TO ACTAMED BY SBCL.

       A.   FEES FOR FIXED FEE SITES.  SBCL will pay ActaMed for the Agreed
Services rendered to Fixed Fee Sites as follows:

            1.   Fixed Fee payments shall be due [*] on the first (1st) 
business day of [*] beginning on January 2, 1998 and shall be in an amount 
equal to 

                 a.   from January 2, 1998 until the day before the first 
business day of [*], [*] per month;

                 b.   from the first business day of [*] until [*].

       B.   TRANSACTION FEE FOR SITES OTHER THAN FIXED FEE SITES.  From the 
Region One Transfer Date and continuing until the day before the [*] SBCL 
will pay to ActaMed, for Agreed Services in respect of sites which are not 
Fixed Fee Sites only, within thirty (30) days after receipt of an invoice 
from ActaMed detailing the charges then due, a fee equal to the sum of [*] 
SBCL in accordance with the Performance Standards during the period covered 
by the invoice (the "TRANSACTION FEE").

       C.   [*].  Provided the conditions set forth in Section IV.D are 
satisfied, SBCL shall pay the following amounts to ActaMed as hereinafter in 
this Section IV.C provided:

            1.   An amount (the "FIRST VARIABLE FEE") equal to (i) [*] minus 
the aggregate of the amount billed to SBCL pursuant to Section IV.B.1 above 
(the "TRANSACTION FEE AMOUNT") prior to the [*]; (ii) [*] minus the sum of 
(A) the Transaction Fee Amount for the period from the date hereof to the [*] 
and (B) the amount paid pursuant to clause (i) above; and (iii) [*] minus the 
sum of (A) the Transaction Fee Amount for the period from the date hereof to 
the [*] and (B) the amount paid pursuant to clauses (i) and (ii) above. 

            2.   An amount (the "SECOND VARIABLE FEE" and together with the 
First Variable Fee, the "VARIABLE FEES") equal to (i) [*] minus the aggregate 
of the amount paid plus amounts owed (whether or not billed) pursuant to 
Section IV.M.1 below (the "PIF AMOUNT") prior to the [*]; (ii) [*] minus the 
sum of (A) the PIF Amount for the period from the date hereof to the 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                     -10-
<PAGE>

[*] and (B) the amount paid pursuant to clause (i) above; and (iii) [*] minus 
the sum of (A) the PIF Amount for the period from the date hereof to the [*] 
and (B) the amount paid pursuant to clauses (i) and (ii) above; PROVIDED THAT 
if the PIF Amount with respect to an annual period (other than the last such 
annual period) is at least [*] of the aforementioned dollar amount for that 
annual period, no payment shall be due under this Section IV.B.2 for such 
annual period.

            3.   Subject to Section IV.D, the Variable Fees shall be paid 
annually within thirty (30) days after invoice therefor from ActaMed, which 
shall be (i) submitted to SBCL within [*] (ii) detail the calculation 
thereof, and (iii) reflect the Variable Fees payable in respect of the most 
recently completed annual period only.  SBCL shall have Audit Rights with 
respect to any disputed amount of the Variable Fees.

       D.   CONDITIONS TO [*].  ActaMed and SBCL have agreed that the 
foregoing [*] with respect to the provision of Lab EDI Services after the 
date hereof shall apply (i) [*] and (ii) to the extent set forth in this 
Section IV.D:

            1.   With respect to [*] (i) such fees shall cease to be payable 
if (i) ActaMed shall fail to satisfy any of the Key Performance Standards, or 
(ii) such fees [*] for the applicable year shall not be payable (but shall be 
treated as paid for purposes of calculation of any amount payable in the 
following year) if any of the following shall occur:

                 a.   As of [*] shall [*] of [*] at [*] it has [*] as of [*];

                 b.   As of [*] shall [*] of [*] at [*] it has [*] as of [*];

                 c.   As of [*] shall [*] of [*] at [*] it has [*] as of [*];

            2.   With respect to the [*] such fees shall be payable [*] in 
accordance with the Performance Standards [*] pursuant to Section [*].

       E.   LATE FEE.  A late fee of [*] per month on the unpaid balance of 
any payments owing pursuant to this Section IV after expiration of the thirty 
(30) day period for payment thereof shall be due from SBCL.  


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -11-
<PAGE>

       F.   [*] OF PAYMENTS.  After the [*] Anniversary, with respect to any 
month after ActaMed has [*] with the [*] for [*] SBCL may, at its option, [*]
 or other [*] to [*] for such month [*] established with [*] to be [*] the 
date as of which [*] with the [*].

       G.   DEFINITION OF FIXED FEE SITES.  "Fixed Fee Sites" shall mean the 
[*] PROVIDED HOWEVER THAT:

            1.   if the number of SBCL Sites transferred to ActaMed on any 
Transfer Date, when added to the number of ActaMed Sites on the date of such 
Transfer, totals more than [*] any sites in excess of [*] (such excess to be 
identified as described in the next sentence) shall not be Fixed Fee Sites.  
The sites to be excluded from Fixed Fee Sites will be (i) from the Region 
transferred on such Transfer Date, and (ii) selected, in order, from a list 
of such sites that is sorted on the basis of the date of the first successful 
Requisition from each site, beginning with the site which had the most recent 
first successful Requisition, and continuing to the sites with the next most 
recent first successful Requisition; and

            2.   if, on the last day of [*] the number of sites that are 
Fixed Fee Sites [*] a number of sites, not to exceed [*] sites in any year, 
that are not Fixed Fee Sites [*] PROVIDED THAT the aggregate number of Fixed 
Fee Sites [*].  The [*] will be [*] in order, from a list of [*] that is 
sorted on the basis of the date of the first successful Requisition from a 
site, beginning with the site on such list which had the least recent first 
successful Requisition, and continuing to the sites with next least recent 
first successful Requisition; [*].

       H.   RENEGOTIATION OF PRICES.  For a period of at least [*] prior to 
[*] the parties will negotiate new Transaction Fees which shall apply for 
the [*] period beginning on [*].  The parties will thereafter similarly 
negotiate new Transaction Fees for each two (2) year period thereafter for 
each renewal period in the term of this Agreement.  [*]


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -12-
<PAGE>

[*].

       I.   EFFECT OF [*] CHANGES.  If either of the following occurs, then 
the parties agree to negotiate in good faith to restructure the Transaction 
Fees payable or other provisions hereunder in a manner that will be fair to 
both parties while at the same time preserving the economic expectations of 
the parties under this Agreement to the greatest extent possible and in a 
manner consistent with the [*].  Any dispute as to the amendments to this 
Agreement to be made in the event of a [*] shall be settled in accordance 
with the procedures set forth in Article XV hereof.

            1.   Any [*] is [*] or determined to [*] including without 
limitation any significant reduction in SBCL's [*] or significant increase in 
the [*] as compared to SBCL's [*] and [*] as of the date of this Agreement  
as set forth on EXHIBIT IV.I hereto (which shall be delivered within thirty 
(30) days after the date hereof); or

            2.   if the Automated Providers' [*] such that the effective [*] 
for such period [*] with no corresponding [*].

       J.   PHONE LINE TRANSFER COSTS.  SBCL shall reimburse ActaMed for [*] 
of any charges, assessments, fees or other amounts incurred by ActaMed for 
the transfer of any dedicated phone lines installed in Automated Providers' 
offices for Lab EDI Services into the ActaMed name, including without 
limitation any transfer fees or new installation fees.

       K.   ActaMed Obligations Regarding Hardware.  

            1.   ActaMed shall reimburse SBCL for the cost of hardware
purchased by SBCL and located at SBCL Sites other than Fixed Fee Sites in a
Region to be transferred to ActaMed on a Transfer Date.

            2.   Subject to the limitations of Section III.L.2(b) hereof, 
ActaMed and SBCL understand and agree that, [*] are to [*] for providing [*] 
to Providers, there will be situations where [*] is [*] for ActaMed to 
provide Lab EDI Services to certain Providers.  ActaMed desires that the 
number of such new sites be capped.  SBCL and ActaMed have therefore agreed 
that:

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -13-
<PAGE>

                 a.   ActaMed shall provide [*], PC Systems for up to [*].  
ActaMed may provide hardware for such [*] by either moving existing PC 
Systems from a canceled Fixed Fee Site or by providing new PC Systems, as it 
determines in its sole discretion.

                 b.   In addition, ActaMed shall provide, prior to the [*] 
Anniversary, [*] PC Systems for New Sites or [*] in excess of the [*]. 
Notwithstanding the above, this obligation shall be (a) limited to [*] PC 
Systems prior to the [*] and (b) reduced by each PC System the cost of which 
is reimbursed to SBCL subject to Section IV.K.1 above.

                 c.   Any PC Systems in excess of those required to be provided
by ActaMed under (i) and (ii) above may be provided by SBCL to the Automated
Provider, subject only to the Automated Provider entering into a contract with,
and satisfactory to, SBCL for the use of such PC System.

       L.   SPECIAL FEE FOR USE OF SCAN DEVELOPMENTS.  SBCL will pay ActaMed 
a fee equal to [*], or [*] received by SBCL for [*] that use SCAN 
Developments for Lab EDI Services over the SCAN Network and which [*].

       M.   SPECIAL FEES FOR NEW SITES.  From the Region One Transfer Date 
and continuing until the day before the [*], SBCL will pay to ActaMed, within 
thirty (30) days after receipt of an invoice from ActaMed detailing the 
charges then due, the following amounts:

            1.   a one time fee of [*] for [*] services at each PIF Site [*] 
or "PIF"); and

            2.   up to the first [*] of any out-of-pocket cost required to be 
incurred by ActaMed to provide the bar code label printer to be used for 
orders to SBCL Labs at any New Site or any [*] during the period covered by 
the invoice. ActaMed shall charge the Automated Provider [*] using the bar 
code label printer for anything other than Lab EDI Services for the fair 
market value of any such use. If an Automated Provider ceases to use Lab EDI 
Services, SBCL may direct where the printer previously installed at such 
Automated Provider will be next installed or ActaMed shall purchase, at its 
cost and without reimbursement under this Section IV.M.2, a bar code label 
printer for installation at another Automated Provider's location to be 
determined by SBCL.

       N.   DISPUTED INVOICES.  In the event SBCL disputes any amount shown due
on such invoice, SBCL shall send a Dispute Notice to ActaMed.  In such event,
SBCL shall timely pay any undisputed amount to ActaMed and shall have Audit
Rights with respect to the portions of ActaMed's books and records that relate
to the subject of the dispute.  In the event the parties are unable to resolve
the disputed matter, the matter shall be resolved in accordance with Section XV


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -14-
<PAGE>

hereof and application of any late fee to such disputed amount shall be 
tolled until conclusion of such proceedings and then applied only to the 
amount so determined to be due.

V.     CHANGES AND DEVELOPMENT OF NEW FUNCTIONALITY.

       A.   MAINTENANCE.  ActaMed shall provide such maintenance upgrades and
updates to the Network as set forth on EXHIBIT V.A and shall maintain and
enhance the Network so as to improve from time to time the speed, accuracy,
security and other features and functions available for Lab EDI Services. 
ActaMed shall make available to Automated Providers all such modified, upgraded,
enhanced or improved services or software at no additional charge except as
permitted by this Agreement or applicable agreement with Automated Providers.

       B.   YEAR 2000 COMPLIANCE.  ActaMed shall provide, without charge to
SBCL or to Automated Providers (unless the Automated Providers own the PC
Systems needing Year 2000 compliance), such maintenance and hardware upgrades
and updates to the Network (other than the SBCL gateway), or other software
relating (or which will relate) to Lab EDI Services as is necessary for all such
software and related hardware to include acceptable design and performance
specifications so that any or all such software will not abruptly end or provide
invalid or incorrect results due to issues related to Year 2000 compliance and
will otherwise be in compliance with the warranties set forth in EXHIBIT V.B
hereto. Year 2000 compliance requires that the design and performance
specifications of the hardware, software and/or other items include, without
limitation:  date data century recognition, calculations that accommodate same
century and multi-century formulas and date values, and date data interface
values that reflect the century change at the year 2000.  SBCL shall provide
specifications for Year 2000 compliance for SBCL systems in sufficient time to
allow ActaMed and SBCL to mutually agree on and ActaMed to complete such
modifications as are necessary to enable ActaMed to meet the requirements of
this Section V.B.  SBCL will also provide reasonable cooperation and assistance
to ensure ActaMed's understanding of the requirements of this Section V.B. 
Prior to any sale of PC Systems to any Automated Provider or potential Automated
Provider, ActaMed shall disclose to such Automated Provider any Year 2000
compliance problems of such PC System which are then known to ActaMed after
reasonable inquiry.  A condition of any such sale shall be appropriate
arrangements for making the PC System to be sold Year 2000 compliant.  In this
regard, the sales price shall reflect the fair market value of the services
required to make the PC System Year 2000 compliant.

       C.   REQUIRED CHANGES.  ActaMed shall be required to develop and 
implement, at its expense except to the extent hereinafter provided, as 
promptly as practicable and in no event later than thirty (30) days prior to 
the effective date of the applicable Regulatory Change, any Changes which (i) 
ActaMed determines are required for the Network Software to remain in 
compliance with all applicable Regulations, or (ii) SBCL requests in writing 
to ActaMed for compliance with Regulations of the Network Software.

            1.   If SBCL reasonably determines that ActaMed cannot provide such
required work by thirty (30) days prior to a deadline imposed by governmental
authority, SBCL shall have the 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -15-
<PAGE>

right to contract with a third party for such work or to do such work itself. 
In such event, SBCL shall be reimbursed therefor by ActaMed, except as 
provided in Section V.C.3 below.  

            2.   Upon reasonable advance written notice to ActaMed, SBCL may
request,  and if it so requests ActaMed shall use its good faith efforts to
accommodate, prioritization of such Changes over any other software development
work performed by or on behalf of ActaMed.

            3.   In any event, upon reasonable advance notice to ActaMed, SBCL
shall be entitled to change the prioritization of required Changes from time to
time and to resolve conflicts between Changes demanding equal prioritization to
the extent necessary to deliver any such Change not less than thirty (30) days
prior to any government imposed deadlines or as promptly as practicable.

            4.   If ActaMed disputes that Changes requested by SBCL pursuant 
to clause (ii) of Section V.C are required by Regulations, either ActaMed or 
SBCL shall be entitled to cause the dispute to be resolved in accordance with 
the procedures set forth in Section XV.B.1.a and XV.B.1.b thereof.  If such 
process is used and results in substantial agreement with either (i) ActaMed, 
then [*] (including the cost of FTEs) in implementing such Changes, or (ii) 
SBCL, [*].  If such process is not used or does not result in an agreement as 
to whether or not such Change is required by Regulations, ActaMed and SBCL 
shall mutually agree on an outside counsel familiar with issues of the nature 
involved in the dispute and the opinion of such counsel shall be binding on 
the parties hereto.

       D.   ACTAMED DEVELOPED NEW FUNCTIONALITY.  When ActaMed develops new 
functionality for the Network that ActaMed offers generally to its customers, 
which is not included in a maintenance release that ActaMed offers generally 
to its customers pursuant to Section V.A. above, ActaMed will offer such new 
functionality to Automated Providers on the same basis [*] subject to SBCL's 
right to accept or reject such new functionality.

       E.   Development Work Requested by SBCL.  

            1.   SBCL at any time may request that ActaMed perform additional
development work and, subject to the terms of this Section V.E, shall pay
ActaMed for such work at no higher than the then industry standard rates for
similar services.

                 a.   If SBCL requests in writing that ActaMed provide 
additional development work for use exclusively by SBCL and, regardless of 
whether ActaMed or a third party actually performs such development work, 
ActaMed shall either (i) [*] in which case such work shall be a "Perpetual 
Exclusive Development", or (ii) acting in good faith, [*] in which case such 
work shall be a "Temporary Exclusive Development".  With respect to Perpetual 
Exclusive Developments, ActaMed will not use or license 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -16-
<PAGE>

the use of the Perpetual Exclusive Developments (without regard to whether 
they constitute SCAN Developments or ActaLab Software) other than in support 
of Lab EDI Services. With respect to Temporary Exclusive Developments, 
ActaMed will not use or license the use of Temporary Exclusive Developments 
(without regard to whether they constitute SCAN Developments or ActaLab 
Software) other than in support of Lab EDI Services for a period of [*] from 
the date on which ActaMed first makes available to SBCL such Temporary 
Exclusive Development for use on a commercial basis in support of SBCL's 
laboratory testing services.  After expiration of such [*] period, subject to 
resolution of any dispute relating to ActaMed's initial designation of such 
development work as a Temporary Exclusive Development pursuant to Section 
V.E.1.b,  such Temporary Exclusive Development shall no longer be an 
Exclusive Development.

                 For purposes of this Section V.E, Perpetual Exclusive
Developments and Temporary Exclusive Developments shall include any Changes made
pursuant to Section V.C and paid for by SBCL by reason of Section V.C.4, to be
designated as Perpetual Exclusive Developments or Temporary Exclusive
Developments in accordance with the procedures set forth in this Section
V.E.1.a.  All such developments are herein referred to collectively as
"Exclusive Developments."

                 b.   Within twenty (20) days after receiving SBCL's request
pursuant to Section V.E.1.a, ActaMed shall notify SBCL of ActaMed's prices and
terms for performing such development work, and whether such work will
constitute a Perpetual Exclusive Development or a Temporary Exclusive
Development.  If SBCL provides notice ("Acceptance Notice") accepting ActaMed's
price and performance terms, ActaMed shall perform such work at the accepted
price and on the accepted performance terms.  If SBCL provides notice that it
disputes ActaMed's determination that the development work should constitute a
Temporary Exclusive Development, the parties shall resolve the dispute in
accordance with Section XV.  If either (i) ActaMed declines any work requested
pursuant to this Section V.E.1, or (ii) SBCL provides notice that it does not
accept ActaMed's price and performance terms, then SBCL may engage a third party
to perform such work.

                 c.   Any contract between ActaMed and SBCL (or a third party
developer and SBCL) for development of Exclusive Developments shall allocate
ownership of and other rights with respect to the Exclusive Developments as
between ActaMed and SBCL, in the manner contemplated by the License Agreement
and Development Agreement, including, without limitation, Sections 2.1.4 and
2.3.2 of the License Agreement.

            2.   If, at any time, SBCL chooses to contract with ActaMed for a
dedicated services team from ActaMed to handle development of Changes to the
Network, the Licensed Materials, or SBCL's proprietary systems which are not
required to be performed by ActaMed pursuant to Section V.C and which are not
requested pursuant to Section V.E, ActaMed may elect whether to provide the
dedicated team and, if it so elects, shall do so only on terms and conditions
agreed to in advance by SBCL.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -17-
<PAGE>

       F.   Development Work Requested or Used by Another ActaMed Customer.   

            1.   When ActaMed performs development work on the Network at the 
request of another ActaMed customer, SBCL shall have the right to obtain [*] 
but only for so long as ActaMed has the legal right to [*] to SBCL and [*] is 
not proprietary to the contracting party.

            2.   When ActaMed performs development work on the Network at the
request of SBCL and such work is usable in connectivity with Other Labs (and is
not an Exclusive Development), [*].

       G.   ACCESS AND COOPERATION.  Whenever SBCL shall use a third party 
developer, ActaMed shall allow such third party such access to the Network as 
shall be reasonably necessary to complete such work and shall cooperate with 
such third party, PROVIDED THAT such access and cooperation shall be subject 
to such third party (i) executing reasonable and appropriate security and 
confidentiality agreements with ActaMed, (ii) abiding by ActaMed's internal 
policies applicable to all third party developers, and (iii) agreeing to [*] 
in providing such access and cooperation.

       H.   EMPLOYEE WAIVERS.  ActaMed shall ensure that all employees or
agents who perform customer support services or have access to any Network
Software (whether in preliminary or final form) have signed non-disclosure and
assignment agreements that, at minimum, contain provisions (i) prohibiting the
disclosure of Confidential Information to the same extent as is set forth in
Section X hereof, and (ii) effecting the complete transfer and assignment
(without further consideration) by such employee or agent to SBCL or ActaMed, as
appropriate, of all right, title and interest to all software and documentation
and any proprietary rights thereto to the extent required pursuant to the
License Agreement.

       I.   STATEMENT OF WORK AND ACCEPTANCE FOR NEW WORK.  In the event any 
Change projected to cost in excess of [*] is to be made by ActaMed pursuant 
to this Section V, ActaMed shall deliver a Statement of Work therefor within 
thirty (30) days after the Change becomes known to it and shall, subject to 
the other provisions of this Section V, dedicate sufficient resources to the 
development and implementation of such Change as shall be necessary to gain 
acceptance of and deploy the Change in accordance with such Statement of Work.

VI.    COMPLIANCE MATTERS.

       ActaMed is a computer technology company which provides electronic
connectivity services, and is not a health care provider.  ActaMed acknowledges
that, for a laboratory services provider such as SBCL, the ability to assure
that it complies with applicable laws, rules or regulations ("Applicable Laws"),
including, but not limited to, the federal Physician Self-Referral Law, 42


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -18-
<PAGE>

U.S.C. 1395nn, and the regulations promulgated thereunder (together, the "Stark
Law"), similar state physician self-referral laws and regulations (together with
the Stark Law, the "Self-Referral Laws"), the federal Medicare/Medicaid
Antikickback Law and regulations promulgated thereunder (the "Federal
Antikickback Law"), and similar state antikickback laws and regulations
(together with the Federal Antikickback Law, the "Antikickback Laws"), is of
critical importance.  SBCL and ActaMed intend that the outsourcing of the Lab
EDI Services to ActaMed and the subsequent provision of the Agreed Services by
ActaMed to SBCL be done in a manner that allows SBCL to maintain its compliance
with Applicable Laws.  Accordingly, SBCL and ActaMed have agreed to the
provisions set forth in this Section VI, although SBCL and ActaMed understand
and agree that the provisions of this Section VI and of the separate SOPs (as
defined below) that may be agreed to from time to time by SBCL and ActaMed may
not be necessary or may be more restrictive than necessary to assure SBCL's
continued compliance with Applicable Laws.

       A.   Representation, Warranty and Covenant.  ActaMed represents,
warrants, and covenants to SBCL as follows:

            1.   ActaMed will not directly or indirectly provide any
remuneration, as defined in the applicable Self-Referral Laws or Antikickback
Laws, to any Provider to whom any of such Self-Referral Laws or Antikickback
Laws applies on behalf of SBCL, except for direct or indirect remuneration
permitted by such law.

            2.   In furtherance and not in limitation of the foregoing, SBCL
and ActaMed may, from time to time, agree upon certain principles, activities,
agreements, standard operating procedures and/or actions (the "SOPs") that one
or both parties, as applicable, will follow or undertake to help SBCL assure its
compliance with Applicable Laws, and each party will follow any such SOPs
applicable to it in the course of conducting its respective business.

            3.   With respect to [*] to which ActaMed is [*] in connection 
with the provision of Lab EDI Services, ActaMed will not [*] [*] unless and 
until SBCL has informed ActaMed in writing that it is willing to [*] and that 
ActaMed and SBCL have agreed upon [*].

            4.   ActaMed will provide any reasonable assistance that SBCL may
request from ActaMed, including the provision of information or other
assistance, in order for SBCL to fulfill any obligation that SBCL, in its sole
discretion, determines it has under the Integrity Agreement.  Notwithstanding
the foregoing, nothing in this provision is intended to or should be interpreted
to mean that ActaMed is subject to any of the provisions of the Integrity
Agreement.

            5.   In the event that SBCL becomes aware of an issue with respect
to compliance with this Section VI, SBCL will promptly inform ActaMed of such
issue and ActaMed will promptly address such issue and take action to remedy any
such issue to the reasonable satisfaction of SBCL.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -19-
<PAGE>

            6.   ActaMed will notify SBCL of any proposed changes in ActaMed's
business practices with respect to EDI or the provision of LAB EDI Services 
that are likely to affect SBCL or Automated Providers (other than [*]) a 
reasonable period prior to the proposed implementation of such change or 
changes and will provide SBCL with a reasonable opportunity to review those 
proposed changes for compliance with this Section VI prior to implementation. 
If [*] any such [*] based on an [*] or the [*], [*] with [*] to [*] before [*].

       B.   AUDIT RIGHTS.  SBCL shall have Audit Rights, exercisable [*] 
with respect to all of ActaMed's books, records and other materials that 
relate to any compliance issues covered by this Section VI in order for SBCL 
to determine ActaMed's fulfillment of its obligations hereunder or under any 
separately agreed upon SOPs.  When ActaMed enters into agreements with 
Providers, it will use its best efforts to secure the right for ActaMed and, 
if such Provider is an SBCL client, for SBCL, to audit such Provider's books 
and records, and other materials and/or to inspect the Provider's premises to 
assure that any compliance requirements established with such Provider are 
being satisfied, and, upon request from SBCL, ActaMed will permit SBCL to 
exercise such rights.  In any exercise of Audit Rights under this Section 
VI.B, SBCL shall give ActaMed two (2) weeks' prior written notice of any such 
audit, and shall abide by reasonable ActaMed security and confidentiality 
procedures during the audit.  SBCL and ActaMed shall each bear their own 
expenses associated with such audit.

       C.   DISPUTE RESOLUTION.  Notwithstanding any other provision of this
Agreement to the contrary, because of the critical nature of compliance to
SBCL's business, disputes regarding compliance with this Section VI may not be
susceptible to resolution following normal dispute resolution mechanisms.  In
the event that SBCL and ActaMed have a disagreement or dispute regarding
compliance with this Section VI, ActaMed agrees to use its best efforts in
working with SBCL to attempt to resolve that dispute as soon as possible.  If
the parties are not able promptly to resolve any such dispute, and the parties
are not able to agree upon another mechanism, such as that provided for in
Section V.C.4 hereof, to resolve the issue, SBCL shall have the right to
exercise any and all remedies available to it under this Agreement, including
the right to terminate the Agreement.

VII.   PREFERRED LAB EDI VENDOR.

       A.   PREFERRED LAB EDI VENDOR RELATIONSHIP.   Provided none of the 
events has occurred which is described in Section VII.B hereof, SBCL will, [*]
afford ActaMed "preferred Lab EDI Vendor" status in the United States to 
the extent set forth in this Section VII.  In this regard, SBCL will:

            1.   instruct its salespeople that when occasions arise where it is
appropriate to do so, inform Providers interested in Lab EDI Services that
ActaMed is its preferred vendor for all Lab EDI Services;


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -20-
<PAGE>

            2.   indicate that ActaMed is SBCL's preferred vendor for Lab EDI
Services in appropriate communications, whether internal or external, written or
oral, as determined by SBCL that relate to the topic of Lab EDI Services and
where a Lab EDI Services vendor is mentioned; 

            3.   from the date when the ActaLab Software is approved by SBCL
for use by Automated Providers, (i) cause the marketing materials for SCAN
Software to be revised to feature the ActaLab Software; and (ii) train the SBCL
salespeople at no direct expense to ActaMed regarding the general features and
benefits of the ActaLab Software;

            4.   instruct its salespeople of the benefits to SBCL of ActaMed's
preferred status so that whenever they undertake sales efforts or negotiations
with a Provider whom SBCL believes to be a significant future customer for Lab
EDI Services with an SBCL Lab, or with a significant Automated Provider serviced
by ActaMed, insofar as it is known to the salesperson, for renewal or extension
of lab testing services at an SBCL Lab, if appropriate, invite representatives
from ActaMed to be included in such sales efforts and negotiations, so that
ActaMed may promote the use of the ActaLab Software to such customer;

            5.   inform appropriate third parties, including but not limited to
practice management system companies, electronic medical record vendors and
other EDI clearinghouses interested in establishing Lab EDI Services (or
services relating thereto) with SBCL, that, ActaMed is SBCL's preferred provider
for Lab EDI Services, and suggest that, provided ActaMed has the capabilities
sought by the third party, the third party pursue a contractual relationship
with ActaMed regarding such Lab EDI Services. 

       B.   LIMITATIONS ON PREFERRED PROVIDER STATUS.  The provisions of
Section VII.A shall apply unless and until any of the following occurs: 

            1.   ActaMed ceases to offer products and services which have
features and functionality which are substantially comparable to other similar
products and services of similar vendors for services in the nature of Lab EDI
Services; SBCL provides written notice of same and, within thirty (30) days
after such notice is given, ActaMed fails to demonstrate to SBCL's reasonable
satisfaction that such determination is not accurate. 

            2.   An Other Lab becomes a shareholder of ActaMed; provided that,
after ActaMed has consummated a Qualified Public Offering (as defined in
ActaMed's Fourth Amended and Restated Articles of Incorporation), this clause 2
shall apply only if the Other Lab becomes a shareholder of ActaMed by reason of
either an issuance of equity to the Other Lab by ActaMed or waiver of
restrictions in agreements between ActaMed and its stockholders which are
comparable to the Standstill Agreement between ActaMed and SBCL dated the date
hereof.

            3.   Any of the events described in clauses 2 through 5 of Section
XII.B shall have occurred (without regard to grace periods otherwise applicable
thereto and other than an event under clause 7 thereof which is based upon a
failure of SBCL to pay amounts due from it hereunder).

                                       -21-
<PAGE>

            4.   ActaMed fails to meet any of the Performance Standards in [*]
or [*].

            5.   Any of the events described in Article X of the Assets
Purchase Agreement shall have occurred.

            6.   In the event that SBCL merges with or into, or acquires or 
is acquired by an entity, owning or operating a clinical laboratory, or sells 
substantially all of its assets to another entity in a transaction in which 
this Agreement is assigned to such entity, SBCL shall have the right to elect 
to have the preferred provider status removed with respect to such other 
entity, PROVIDED THAT the [*] set forth in Section IV.C and D hereof shall 
remain in effect after such transaction; and PROVIDED FURTHER THAT before 
exercising such right, SBCL shall have used its good faith efforts to 
preserve the original intention of the parties hereto.

       C.   EXCLUSIONS.  Notwithstanding anything to the contrary contained 
in this Agreement, including without limitation this Section VII, SBCL shall 
be entitled without restriction and in its sole discretion, to (i) utilize or 
change any EDI system for purposes of connectivity between an SBCL Lab and a 
Provider [*], or between SBCL Labs, utilizing Lab EDI Services that SBCL has 
already established or begun to establish connectivity capabilities as of the 
date hereof, including without limitation those set forth on EXHIBIT VII.C-1 
which Exhibit shall be delivered by January 15, 1998 and shall represent 
SBCL's best efforts to identify all such capabilities which are significant 
to SBCL; (ii) terminate or not renew its current contracts or arrangements 
with third parties relating to Lab EDI Services;  (iii) pursue future 
arrangements or relationships for Lab EDI for any exclusion described in 
EXHIBIT VII.C-2, and (iv) utilize or change any EDI system between SBCL Labs 
and other facilities owned, managed and/or operated by SBCL.

       D.   EXCLUSIONS FOR [*].  Notwithstanding anything to the contrary 
contained in this Agreement, including without limitation this Section VII, 
SBCL shall be entitled without restriction and in its sole discretion, to 
change, continue to use or install [*]. At some time in the future, SBCL will 
consider a proposal from ActaMed for some or all of these [*] transactions 
and enter into reasonable negotiations, if appropriate.  For a period of [*] 
from the date hereof, SBCL will not [*] Lab EDI Services without notifying 
ActaMed and affording ActaMed opportunity to propose to provide such services.

       E.   FUTURE ACTAMED PARTICIPATION IN EXCLUDED ARRANGEMENTS.  
Notwithstanding Section VII.C above, SBCL will endeavor to include ActaMed in 
opportunities relating to the arrangements identified in Section VII.C(iii) 
to the extent feasible and appropriate as determined by SBCL for Lab EDI or 
physician connectivity. The nature and pricing of ActaMed's involvement will 
be negotiated on a case by case basis. 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -22-
<PAGE>

       F.   ELIGIBILITY AND CLAIMS PROCESSING SERVICES.  During the initial 
term of this Agreement, SBCL will use all reasonable business efforts, 
consistent with its competitive needs in the lab testing business, to utilize 
ActaMed as SBCL's preferred provider of electronic eligibility verification 
and claims processing services to provide connectivity with all third party 
payers with which SBCL desires connectivity and ActaMed is then connected,  
PROVIDED THAT this Section VII.F shall apply only if (i)  SBCL desires to use 
an outside vendor for such services, and (ii) the prices proposed to be 
charged by ActaMed for such services are [*]. In furtherance of such "preferred"
status, SBCL shall offer ActaMed as one of the potential providers of such 
services in any written response to a request for proposals for lab testing 
services.  For each written SBCL proposal for the provision of such services, 
SBCL shall provide ActaMed with a copy of the sections thereof describing 
ActaMed's proposed services.  SBCL shall provide ActaMed with such reasonable 
opportunity as circumstances permit to review and correct or comment on any 
such proposed language.    Notwithstanding the foregoing, SBCL shall not be 
obligated to comply with the provisions of this Section VII.F in those cases 
in which (i) the payer designates (in the request for proposals or otherwise) 
a provider of such services other than ActaMed, or (ii) it would violate any 
Regulation, contractual provision or obligation by which SBCL is bound.

       G.   FURTHER EXCLUSIONS FOR NON-LABORATORY EDI. Nothing contained herein
shall prohibit SBCL from engaging in or contracting with third parties relating
to non laboratory related EDI transactions including but not limited to the
following, as long as each of the following is not intended primarily as a
connection from an Automated Provider to a network for the purposes of Lab EDI
Services (or services related thereto):  [*].

VIII.  COOPERATIVE RELATIONSHIP.

       A.   COOPERATION.   Upon SBCL request, ActaMed will work with SBCL's
sales people to generate site connectivity and will use reasonable efforts to be
available to perform the technical portions of sales presentations made by
SBCL's sales people.

       B.   USE OF OTHER PARTIES' NAME.  Each party shall have the right to
include the other party's name on its client or vendor list and to disclose the
nature of the services and products provided under this Agreement, so long as
such services and products are accurately represented; PROVIDED, HOWEVER, that
neither party has the right to use the other's name, trademarks or trade names
for other advertising, sales promotion, or publicity purposes without the
other's prior written consent.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -23-

<PAGE>

       C.   USER GROUP.  ActaMed will establish a user group, to consult on
priorities and provide direction to ActaMed on system initiatives, which will
include representation from SBCL, Automated Providers and payers.  At regular
intervals not less frequently than annually ActaMed will solicit user
suggestions, input and feedback regarding the Network.

       D.   ACTAMED'S OBLIGATION TO PROMOTE SB FOR DISEASE MANAGEMENT.  For so
long as ActaMed is SBCL's preferred vendor pursuant to Section VII, ActaMed will
undertake actions similar to those set forth in Section VII.A to promote
SmithKline Beecham Corporation's Healthcare Services Division for the Disease
Management Business.  "DISEASE MANAGEMENT BUSINESS" shall be defined in a
separate writing reasonably agreed upon by the parties within thirty (30) days
after the date hereof.

       E.   REFERENCE CHECKS.  SBCL shall designate one or two individuals who
shall respond to a reasonable number of reference inquiries and visits (not to
exceed two visits in any calendar month) by customers and potential customers of
ActaMed on mutually agreeable terms.  SBCL shall retain the right to refuse a
visit to any competitor or potential competitor of SBCL or to terminate the
visit of any customer or potential customer who does not abide by SBCL's
policies and procedures.  ActaMed shall inform all customers and potential
customers allowed on SBCL's premises pursuant to this Section that they are
required to abide by SBCL's policies and procedures.

IX.    SBCL'S OBLIGATIONS REGARDING THE NETWORK.

       A.   STANDARD FORMATS AND PROTOCOLS.  SBCL shall receive and generate
transaction data and any other Lab EDI in a standard format and protocol
mutually agreed upon by the parties.

       B.   HARDWARE AND OPERATING ENVIRONMENT.  SBCL shall provide, at its own
expense, all necessary hardware, including terminal equipment, compatible with
and suitable for its communications with the Network at the SBCL Labs.  ActaMed
shall verify SBCL's operating environment with testing procedures implemented by
ActaMed from time to time, with advance notice to and approval from SBCL, which
approval shall not be unreasonably withheld or delayed.

       C.   NEW RELEASES OF SBCL PROPRIETARY SOFTWARE.   SBCL will make
available to ActaMed all new releases and specifications for the SBCL gateway so
as to enable ActaMed to maintain the ActaMed Gateway substantially the same as
the SBCL gateway, including for Year 2000 compliance.  In addition, SBCL will
give ActaMed advance notice of test code changes, new releases of SBCL
proprietary software and other SBCL host computer system changes (including host
computer systems operated by third party outsourcers on behalf of SBCL), if such
changes or releases will affect ActaMed's ability to transmit information over
the Network.  If any changes are required to the Network by reason of such
actions by or on behalf of SBCL, the parties will mutually agree (consistent
with Section V hereof) in advance on the scope of the project, the deliverables,
deadlines, any fees ActaMed will charge SBCL, a test plan and an acceptance test
plan.

                                       -24-
<PAGE>

X.     CONFIDENTIALITY AND SECURITY.

       A.   DATA CONFIDENTIALITY.  Each party agrees that patient clinical
records are Confidential Information and each party shall not disclose or
utilize individual lab test information in any way that would violate any
patient confidentiality obligation or any Regulations.   Without limiting
ActaMed's obligations regarding Confidential Information which may be otherwise
provided for in this Agreement, ActaMed shall be responsible to ensure the
confidentiality of test results and patient information transmitted over the
Network, in accordance with all applicable Regulations governing such patient
confidential information, including to prevent anyone other than the sender and
addressee of Transmittal Information or their respective authorized employees
from monitoring, using, gaining access to or learning the import or contents of
any Transmittal Information.

       B.   DISTRIBUTION AND USE OF DATA.  All Transmittal Information entered
onto the Network by SBCL or any Automated Provider from tests referred to SBCL,
shall be owned by SBCL and not by ActaMed. ActaMed shall not aggregate,
integrate, compile, regenerate, merge, manipulate or otherwise use the
Transmittal Information for any purposes and shall not provide the Transmittal
Information to any other person or entity, other than as specifically required
or allowed under the terms of this Agreement to perform the Agreed Services,
without the prior written consent of SBCL.  ActaMed agrees that such information
cannot be aggregated for any Provider or among different customers' or other
health care providers or laboratory service providers for any purpose, without
SBCL's prior written consent.

            1.   If ActaMed is served with a warrant, subpoena or any other
order or request from a governmental body or any other entity or person for any
records or files of information transmitted over the Network, ActaMed will as
soon as practicable, and not in violation of law, deliver to SBCL a copy of such
warrant, subpoena, order or request and will not, without SBCL's prior written
consent, accede to the same unless and until required to do so under applicable
law.

            2.   ActaMed acknowledges and agrees that in the event it has 
access to confidential data relating to an Automated Provider and/or the 
Automated Providers's patients, employees and medical staffs, ActaMed will 
hold such information in the strictest confidence and will not, without 
SBCL's prior written consent, disclose any such information, including 
without limitation in any regeneration, recompilation, or reorganization 
thereof, or through any statistical analyses or provision of other excerpts 
thereof.  Without limiting the foregoing, ActaMed agrees that it shall limit 
the ActaMed employees who have access to any patient identifiable health 
information, including without limitation, laboratory test order or results 
information, if any, to only those "need to know" employees of ActaMed as is 
required to perform the Agreed Services to the level of the Performance 
Standards set forth herein.  Such employees shall be identified to SBCL in 
advance of such access and shall have executed and delivered to ActaMed and 
to SBCL, an agreement requiring non-disclosure of confidential information, 
compliance with all ActaMed policies and procedures with respect to 
Confidential Information and security of the Network (which shall be 
consistent with the requirements in this Agreement), if applicable, 
procedures established by SBCL and shall include an acknowledgment of 
immediate termination for breach of such agreement.  To the extent any

                                       -25-
<PAGE>

employee of ActaMed acquires such access to patient health information through
any SBCL computer systems, or [*] ("SBCL ACCESS"), ActaMed shall cause such
employees to abide by SBCL's [*] Security Access procedures, and shall
deliver to SBCL such agreements reflecting same as may be required by SBCL and
identified to ActaMed in writing from time to time.  ActaMed shall be
responsible for promptly notifying SBCL if any employee with SBCL Access is
terminated or leaves the employment of ActaMed.

            3.   Subject to the requirements of Section X.A, ActaMed may, at 
[*] of [*] to such [*] for which the [*] from such [*] without the [*] SBCL. 
There shall be [*] such [*].

            4.   Subject to Section X.A and without limiting the above 
restrictions in this Section X.B, ActaMed [*] without the [*]. A copy of [*] 
shall be provided to SBCL.  ActaMed agrees that, if SBCL's consent is 
obtained, [*] to Automated Providers shall be made available only in 
accordance with all applicable patient confidentiality laws of the states [*]
the patient and SBCL Labs and ActaMed are located, and only [*] or [*].  SBCL 
shall have Audit Rights with respect to any disputed amounts hereunder.

       C.   TRADE SECRET NONDISCLOSURE COVENANT.  Without limiting the
foregoing, Trade Secrets and Confidential Information and all physical
embodiments thereof received by either party (the "RECEIVING PARTY") from the
other party (the "DISCLOSING PARTY") during the term of this Agreement,
including those received pursuant to the exercise of Audit Rights as described
in Section III.E hereof, are confidential to and are and will remain the sole
and exclusive property of the Disclosing Party.  In furtherance of the
foregoing:

            1.   At all times, both during the term of this Agreement and 
after its termination, the Receiving Party shall hold all Trade Secrets of 
the Disclosing Party in confidence, and will not use, copy or disclose such 
Trade Secrets, or any physical embodiment thereof, or cause any of such Trade 
Secrets to lose their character as Trade Secrets.  At all times during the 
term of this Agreement and for a period of [*] following the termination of 
this Agreement, (except where a longer period is required pursuant to this 
Agreement or Regulations) the Receiving Party shall hold the Confidential 
Information of the Disclosing Party in confidence, and will not use, copy or 
disclose such Confidential Information, or any physical embodiments thereof, 
or cause any of such Confidential Information to lose its character or cease 
to qualify as Confidential Information.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -26-
<PAGE>

            2.   Trade Secrets and Confidential Information shall be maintained
under secure conditions by the Receiving Party, using reasonable security
measures and in any event (1) not less than the same security measures used by
the Receiving Party for the protection of its own Trade Secrets and Confidential
Information of a similar kind, and (2) any specific security measures required
by this Agreement.  The Receiving Party shall not remove, obscure or deface any
proprietary legend relating to the Disclosing Party's rights, on or from any
tangible embodiment of any Licensed Materials without the Disclosing Party's
prior written consent.  Within thirty (30) days after termination of this
Agreement, the Receiving Party shall deliver to the Disclosing Party all Trade
Secrets and Confidential Information, and all physical embodiments thereof, then
in the custody, control or possession of the Receiving Party.

            3.   If the Receiving Party is ordered by a court, administrative
agency, or other governmental body of competent jurisdiction to disclose Trade
Secrets or Confidential Information, or if it is served with or otherwise
becomes aware of a motion or similar request that such an order be issued, then
the Receiving Party will not be liable to the Disclosing Party for disclosure of
Trade Secrets or Confidential Information required by such order if the
Receiving Party complies with the following requirements:  (i) if an already
issued order calls for immediate disclosure, then the Receiving Party shall
immediately move for or otherwise request a stay of such order to permit the
Disclosing Party to take measures such as are described in clause (iii); (ii)
the Receiving Party shall immediately notify the Disclosing Party of the motion
or order by the most expeditious possible means; and (iii) the Receiving Party
shall join or agree to (or at a minimum shall not oppose) a motion or similar
request by the Disclosing Party for an order protecting the confidentiality of
the Trade Secrets and Confidential Information, including joining or agreeing to
(or non opposition to) a motion for leave to intervene by the Disclosing Party.

            4.   The Receiving Party shall immediately report to the Disclosing
Party any attempt by any person of which the Receiving Party has knowledge (i)
to use or disclose any portion of the Trade Secrets and Confidential Information
without authorization from the Disclosing Party, or (ii) to copy, reverse
assemble, reverse compile or otherwise reverse engineer any part of the Trade
Secrets or Confidential Information (except as permitted herein).

       D.   PERMITTED DISCLOSURES.  Notwithstanding any provisions of this
Agreement to the contrary, SBCL may disclose to the OIG as part of the
disclosures SBCL makes under its Integrity Agreement the fact that SBCL and
ActaMed have entered into the transactions contemplated by the parties and any
information relating to such transaction or this Agreement which SBCL
determines, in good faith upon advice of counsel, is required or, in light of
SBCL's obligations under the Integrity Agreement, appropriate for SBCL to make,
or SBCL proposes to make in response to a request for such information from the
OIG, provided that ActaMed shall be given opportunity (which shall be reasonable
in light of all facts and circumstances) to review and comment upon the
information SBCL intends to include in any such submission.  In the event that
any such disclosure that SBCL intends to make includes any information that
constitutes Confidential Information of ActaMed or Trade Secrets of ActaMed,
SBCL will provide reasonable (in light of all facts and circumstances, including
the time frame in which such disclosure is required to be made) assistance 

                                       -27-
<PAGE>

to ActaMed to take reasonable steps to assure that such Confidential 
Information or Trade Secrets of ActaMed are maintained in confidence, 
including, but not limited to, (i) requesting that the OIG treat such 
information as trade secrets, confidential information or financial 
information within the meaning of the Freedom of Information Act, 5 U.S.C. 
Section 552(b)(4), (ii) requesting of the OIG that SBCL and ActaMed be given 
prior notice of any proposed release of such information to persons or 
entities outside of the OIG; (iii) requesting that the OIG otherwise assure 
the confidentiality of the information provided by ActaMed as if such 
information was confidential information of SBCL [*] and taking other 
reasonable steps that may be requested by ActaMed and to which SBCL may, in 
its sole discretion, agree to assure that the OIG honors its confidentiality 
obligations in that section; (iv) where such information is to be provided in 
response to a request by the OIG, take reasonable steps to narrow the request 
for information from the OIG in an appropriate manner in order to limit the 
amount of information, if any, that constitute Confidential Information or 
Trade Secrets of ActaMed covered by such request; and (v) make reasonable 
efforts to permit ActaMed with the concurrence of the OIG, to disclose such 
information directly to the OIG provided that in any such case, ActaMed shall 
give SBCL a timely opportunity to review, comment upon, and approve the 
information ActaMed intends to include in such submission.  The additional 
safeguards described in subsections (i) through (v) above are designed to 
help assure the confidentiality of Confidential Information and Trade Secrets 
the disclosure of which would have a material adverse impact on ActaMed.  
These additional provisions are not intended to interfere with SBCL's ability 
to meet its disclosure obligations under the Integrity Agreement.

            Each party shall promptly notify the other in the event it receives
an inquiry, investigation, or request for information from the OIG or other
governmental agency into the matters relating to the proposed transaction.

XI.    RELATIONSHIP MANAGERS.

            ActaMed will designate a representative responsible for the SBCL 
account and who will have decision making authority for ActaMed (the "ACTAMED 
RELATIONSHIP MANAGER").  [*] will be the initial Relationship Manager for 
ActaMed. The ActaMed Relationship Manager will be a member of the Oversight 
Committee and shall attend planning meetings with SBCL, keep SBCL updated on 
national trends in EDI and Lab EDI, and consult with SBCL regarding ActaMed's 
software and Network strategy.  

            SBCL will designate a representative responsible for SBCL's 
relationship with ActaMed who will have decision making authority for SBCL 
(the "SBCL RELATIONSHIP MANAGER"). [*] will be the initial Relationship 
Manager for SBCL. The SBCL Relationship Manager will be a member of the 
Oversight Committee and will coordinate SBCL's activities with ActaMed, 
attend planning meetings with ActaMed, and keep ActaMed updated on technical 
developments with respect to [*] and Lab EDI.

            Each party will consult with the other before changing its
Relationship Manager.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -28-
<PAGE>

XII.   TERM AND TERMINATION.

       A.   INITIAL TERM AND RENEWALS.  This Agreement shall continue for five
(5) years from the Region One Transfer Date, unless earlier terminated as
provided herein. Unless written notice of termination is given by SBCL not less
than one hundred eighty (180) days, or by ActaMed not less than three hundred
sixty (360) days, prior to the end of the term (including any extension or
renewal of the term pursuant to this Section XII.A), the term of this Agreement
will be automatically extended for successive two (2) year periods.

       B.   TERMINATION.   A party may cause a termination of all rights and
obligations of the parties hereunder, except as provided in this Section XII
hereof, as follows:

            1.   In the event that ActaMed fails to meet any of the Key 
Performance Standards in any [*] during any period of [*] SBCL may terminate 
this Agreement immediately by giving written notice of termination to ActaMed.

            2.   SBCL may terminate this Agreement immediately following a
breach by ActaMed of its covenants set forth in Section VI hereof by giving
written notice of termination to ActaMed.

            3.   Either party may terminate this Agreement if the other party
shall fail to pay any amount when due from it hereunder (disregarding for this
purpose any unpaid amount in dispute which dispute is being pursued with
diligence) within thirty (30) days after written notice of a failure to pay is
provided by the terminating party to the nonpaying party. 

            4.   If one party breaches any material provision of this 
Agreement, which breach is not described in Sections XII.B.1-3 above (and 
which is not a breach of Performance Standards other than the Key Performance 
Standards), the nonbreaching party may terminate this Agreement by giving [*] 
written notice of termination to the breaching party.  If such breach is (in 
the reasonable estimation of the terminating party) capable of being cured 
during such period and the other party acts diligently and continuously to 
cure such breach, the termination shall be suspended during such time, 
PROVIDED THAT such breach is actually cured prior to the end of such period; 
AND PROVIDED FURTHER THAT during the period from and after the time an 
ActaMed breach is discovered, SBCL may, at its election, pay all Fixed Fees, 
Transaction Fees, Variable Fees, PIFs and other amounts otherwise due ActaMed 
hereunder into an escrow account established with a nationally recognized 
financial institution selected by SBCL, to be released to ActaMed upon the 
later of the date within such [*] period when the breach is cured or the date 
prior to exercise of the termination right provided in this Section XII.B.4 
as of which ActaMed shall have been not in breach of this Agreement for at 
least thirty (30) days.  If ActaMed proves, to SBCL's reasonable 
satisfaction, that such amounts are needed in order to cure the breach, SBCL 
will release amounts to enable ActaMed to cure the breach, in which case such 
released amounts will be used by ActaMed exclusively for purposes of curing 
such breach.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -29-

<PAGE>
            5.   If one party becomes insolvent, files bankruptcy, or has an
involuntary bankruptcy case filed against it which is not dismissed within
ninety (90) days, the other party may terminate this Agreement immediately by
giving written notice of termination to the breaching party.

       C.   EFFECT OF EXPIRATION. All rights and obligations of the parties
hereunder shall cease upon the expiration of this Agreement except that (i) the
obligations of the parties pursuant to Section X (relating to confidentiality),
and (ii) the exclusive use rights of SBCL pursuant to Section V (relating to
development work) shall continue in full force and effect indefinitely.  In
addition, the obligations of the parties pursuant to Section IV (relating to
compliance with Regulations) shall continue for so long as SBCL shall have Long
Term Access or Short Term Access.

       D.   EFFECT OF TERMINATION. All rights and obligations of the parties 
hereunder shall cease upon the effective date of the termination of this 
Agreement except that (i) the obligations of the parties pursuant to Section 
X (relating to confidentiality), (ii) the exclusive use rights of SBCL 
pursuant to Section V (relating to development work), and (iii) the 
obligations of ActaMed pursuant to Section XII.E hereof (relating to 
termination transition), shall continue in full force and effect 
indefinitely.  In addition, the obligations of the parties pursuant to 
Section IV (relating to compliance with Regulations) shall continue for so 
long as SBCL shall have Long Term Access or Short Term Access.  In the event 
that ActaMed has terminated this agreement for SBCL's failure to pay 
undisputed amounts due under this Agreement, ActaMed will not be required to 
perform services for SBCL or to allow SBCL access to or use of the Network 
during the termination transition period unless SBCL pays ActaMed in advance 
for such services and Network access.  Upon termination of this Agreement, 
any amount in escrow pursuant to Section IV.F or Section XII.B.4 hereof shall 
be paid to the terminating party.

       E.   Transition Upon Termination.

            1.   If this Agreement terminates as a result of a notice of 
non-renewal given by ActaMed pursuant to Section XII.A, ActaMed will provide 
[*] or, at SBCL's option, 

                 a.   SBCL may have [*] so long as ActaMed provides [*] (but 
not less than [*]), or 

                 b.   SBCL may require ActaMed [*] prior to the effective 
date of such termination, and SBCL may exercise the right to [*] as granted 
by the License Agreement.

            2.   If this Agreement terminates as a result of a notice of 
non-renewal given by SBCL pursuant to Section XII.A, ActaMed will provide [*]
and SBCL will have [*].

            3.   If SBCL terminates this Agreement pursuant to Section XII.B, 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -30-
<PAGE>

                 a.   ActaMed will provide [*], 

                 b.   SBCL may require ActaMed [*] within [*] after 
SBCL's notice of termination,

                 c.   SBCL may exercise the right to [*] as granted by the 
License Agreement, and

                 d.   until such time [*] by SBCL on a commercial basis, SBCL 
shall have Long Term Access.

            4.   [*] shall mean that [*] from [*] who have [*] or a version 
of [*].  For [*] SBCL will [*] on the date notice of termination is given.  
ActaMed will [*] and SBCL will [*] is rendered.  If SBCL [*] (subject to [*] 
to those provided in Section [*] hereof), ActaMed will [*].  ActaMed will have 
[*] and SBCL will [*].

            5.   [*] shall mean that ActaMed [*] the date of termination.  
For [*] SBCL will [*] the date of Termination.  ActaMed will [*] the date 
the bill is rendered.  If SBCL [*] (subject to [*] to those provided in 
Section [*] hereof), ActaMed will [*].  ActaMed will have [*] and SBCL will 
have [*].

            6.   [*] shall mean [*] that will only provide [*] and allows [*],
to provide [*] ActaLab Software at their sites.

       F.   TRANSITION UPON TERMINATION. ActaMed's [*] shall mean (i) if the 
date of termination occurs [*] the transfer to SBCL of [*] requested by SBCL 
to [*] SBCL at such time [*] and (ii) providing  SBCL, as promptly as 
practicable, with [*] used for [*] whether or not [*] to which ActaMed is 
in a position to [*] the effective date of the termination and to [*] to the 
transition.  In furtherance of and in addition to the foregoing, upon 
termination or expiration of this Agreement, the parties shall effect, and 
shall cooperate with each other in effecting, 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -31-
<PAGE>

the orderly and reasonable removal of ActaMed as a provider of Lab
EDI Services to Automated Providers in the manner that is least disruptive to
Automated Providers and which allows connectivity between SBCL Labs and
Automated Providers to continue uninterrupted with SBCL or a separate vendor. 
The parties shall jointly develop a removal plan which will provide a reasonable
level of support consistent with Section III hereof to transition SBCL off the
Network. Each party shall bear its own expenses in developing and implementing
the removal plan.

       G.   LICENSE AGREEMENT.  To the extent any provisions of the License
Agreement depend for their interpretation or application upon provisions of this
Agreement, such provisions shall survive termination or expiration of this
Agreement but solely for purposes of the License Agreement.

XIII.  NONSOLICITATION.

       A.   BY SBCL.  Until the occurrence of any of the events described in
Sections XIII.B, SBCL will not, directly or indirectly, solicit any ActaMed Site
to use a clinical laboratory test ordering or results reporting product other
than one serviced or distributed by or otherwise affiliated with ActaMed. 

       B.   EXCEPTIONS TO SBCL NONSOLICITATION.  The restrictions set forth in
Section XIII.A shall not apply from and after the occurrence of the following:

            1.   Any of the events described in clauses 1 through 5 of Section
XII.B shall have occurred (without regard to notice or grace periods otherwise
applicable thereto and disregarding for this purpose any termination event
arising by reason of nonpayment by SBCL of any amount not in dispute).

            2.   Any of the events described in Article X of the Assets
Purchase Agreement shall have occurred.

            3.   Notice of nonrenewal of this Agreement is given by (i) 
ActaMed pursuant to Section XII.A in which case Section XIII.A shall not 
apply for the last [*] of the then remaining term hereof, or (ii) SBCL in 
which case Section XIII.A shall not apply for the last [*] of the then 
remaining term hereof.

       C.   Noncompetition by ActaMed.  

            1.   [*] ActaMed shall not, either individually or through any 
affiliate, employee, director, officer or consultant, directly or indirectly, 
(i) [*], or (ii) compete with SBCL in the Disease Management Business.  The 
specific terms of such noncompetition shall be detailed in the separate 
writing referred to in Section VIII.D to be delivered within thirty (30) days 
after the date hereof.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -32-
<PAGE>

            2.   At any time prior to [*], ActaMed shall not [*] at the SBCL 
Sites transferred to ActaMed pursuant to the Purchase Agreement, including 
without limitation, to install or be instrumental in causing [*] to [*] 
located at such sites which enables the [*], or otherwise provide [*] which 
facilitate [*].

XIV.   OBLIGATION TO INDEMNIFY.

       A.   ACTAMED INDEMNITY.  Subject to Section XIV.C hereunder, ActaMed
agrees to indemnify and hold harmless each SBCL Indemnitee against and in
respect of (i) all Losses, asserted against, imposed upon or incurred by any
SBCL Indemnitee by reason of or resulting from any breach of any representation
or warranty or covenant of ActaMed contained in this Agreement, as well as from
any negligent act or omission of ActaMed; and (ii) any and all actions, suits,
claims, proceedings, investigations, demands, assessments, audits, fines,
judgments, costs and other expenses (including, without limitation, reasonable
legal fees and expenses) incident to any Loss or to the enforcement of this
Section XIV.A.

       B.   SBCL INDEMNITY.  Subject to Section XIV.C hereunder, SBCL agrees to
indemnify and hold harmless each ActaMed Indemnitee against and in respect of 
(i) all Losses, asserted against, imposed upon or incurred by any ActaMed
Indemnitee by reason of or resulting from any breach of any representation or
warranty or covenant of SBCL contained in this Agreement, as well as from any
negligent act or omission of SBCL; and (ii) any and all actions, suits, claims,
proceedings, investigations, demands, assessments, audits, fines, judgments,
costs and other expenses (including, without limitation, reasonable legal fees
and expenses) incident to any Loss or to the enforcement of this Section XIV.B. 

       C.   ALLOCATION OF RISK.   

            1.   ActaMed shall not be liable to SBCL (or to any person claiming
to have been injured by SBCL) for any lab testing error, billing error, or other
action or failure to act of SBCL, or any error or mistake not caused by ActaMed
and made by SBCL in the reporting of lab testing results to ActaMed for delivery
by the Network, and SBCL shall hold ActaMed harmless from all claims caused by
such errors or mistakes to the extent made by SBCL.

            2.   SBCL shall not be liable to ActaMed (or to any person claiming
to have been injured by ActaMed) for any error in Transmittal Information,
billing error, or other action or failure to act of ActaMed, or any error or
mistake not caused by SBCL and made by ActaMed in the transmission of test
orders and results over the Network, and ActaMed shall hold SBCL harmless from
all claims caused by such errors or mistakes to the extent made by ActaMed.

            3.   Neither party shall be liable to the other hereunder for
consequential, special, punitive or exemplary damages of any kind (including,
but not limited to, lost profits, loss of business or other similar damages)
arising out of any action or proceeding except and only to the 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -33-
<PAGE>

extent that such damages arise from or relate to (i) the failure of a party 
to comply with Regulations as required by this Agreement, (ii) an action in 
tort initiated by a third party against either or both of the parties hereto, 
or (iii) breach of a party's confidentiality undertakings set forth herein.

            4.   Neither party shall be liable to the other hereunder in 
connection with any action or proceeding arising from or relating to a matter 
covered by this Section XIV, or for breach of this Agreement, for an amount 
in excess of the greater of (i) [*] or (ii) the [*] prior to the date on 
which such breach occurs; PROVIDED THAT this limitation shall not apply to 
any Losses or other damages arising out of or relating to any action 
described in clauses [*].

       D.   CLAIMS NOTICE.  A Claim shall be made by any Indemnitee by delivery
of a Claims Notice to any Indemnifying Party requesting indemnification and
specifying the basis on which indemnification is sought and the amount of
asserted Losses and, in the case of a Third Party Claim, containing (by
attachment or otherwise) such other information as such Indemnitee shall have
concerning such Third Party Claim.  

       E.   PROCEDURES INVOLVING NON THIRD PARTY CLAIMS.  If the Claim involves
a matter other than a Third Party Claim, the Indemnifying Party shall raise any
objection to such Claim within a reasonable period of time by delivery of a
written notice of such objection to such Indemnitee specifying in reasonable
detail the basis for such objection.  If an objection is timely interposed by
the Indemnifying Party, the Indemnifying Party and the Indemnitee shall
cooperate in the compromise of the Claim or resolve any disagreement in
accordance with Section XV hereof.

       F.   PROCEDURES INVOLVING THIRD PARTY CLAIMS.  The obligations and
liabilities of the parties hereunder with respect to a Third Party Claim shall
be subject to the following terms and conditions:

            1.   The Indemnitee shall give the Indemnifying Party written
notice of a Third Party Claim promptly after receipt by the Indemnitee of notice
thereof, and the Indemnifying Party may undertake the defense, compromise and
settlement thereof by representatives of its own choosing reasonably acceptable
to the Indemnitee.  The failure of the Indemnitee to notify the Indemnifying
Party of such claim shall not relieve the Indemnifying Party of any liability
that they may have with respect to such claim except to the extent the
Indemnifying Party demonstrates that the defense of such claim is prejudiced by
such failure.  The assumption of the defense, compromise and settlement of any
such Third Party Claim by the Indemnifying Party shall be an acknowledgment of
the obligation of the Indemnifying Party to indemnify the Indemnitee with
respect to such claim hereunder.  If the Indemnitee desires to participate in,
but not control, any such defense, compromise and settlement, it may do so at
its sole cost and expense.  If, however, the Indemnifying Party fails or refuses
to undertake the defense of such Third Party Claim within ten (10) days after
written notice of such claim has been given to the Indemnifying Party by the
Indemnitee, the Indemnitee shall have the right to undertake the defense,
compromise and settlement 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -34-
<PAGE>

of such claim with counsel of its own choosing. In the circumstances 
described in the preceding sentence, the Indemnitee shall, promptly upon its 
assumption of the defense of such claim, make a Claim as specified in 
Sections XIV.A and XIV.B which shall be deemed a Claim that is not a Third 
Party Claim for the purposes of the procedures set forth herein.

            2.   If, in the reasonable opinion of the Indemnitee, any Third
Party Claim or the litigation or resolution thereof involves an issue or matter
which could have a material adverse effect on the business, operations, assets,
properties or prospects of the Indemnitee, the Indemnitee shall have the right
to control the defense, compromise and settlement of such Third Party Claim
undertaken by the Indemnifying Party, and the reasonable costs and expenses of
the Indemnitee in connection therewith shall be included as part of the
indemnification obligations of the Indemnifying Party hereunder.  If the
Indemnitee shall elect to exercise such right, the Indemnifying Party shall have
the right to participate in, but not control, the defense, compromise and
settlement of such Third Party Claim at its sole cost and expense.

            3.   No settlement of a Third Party Claim involving the asserted
liability of the Indemnifying Party under this Article shall be made without the
prior written consent by or on behalf of the Indemnifying Party, which consent
shall not be unreasonably withheld or delayed.  If the Indemnifying Party
assumes the defense of such a Third Party Claim, (1) no compromise or settlement
thereof may be effected by the Indemnifying Party without the Indemnitee's
consent unless (a) there is no finding or admission of any violation of law or
any violation of the rights of any person and no effect on any other claim that
may be made against the Indemnitee (b) the sole relief provided is monetary
damages that are paid in full by the Indemnifying Party and (c) the compromise
or settlement includes, as an unconditional term thereof, the giving by the
claimant or the plaintiff to the Indemnitee of a release, in form and substance
satisfactory to the Indemnitee, from all liability in respect of such Third
Party Claim, and (2) the Indemnitee shall have no liability with respect to any
compromise or settlement thereof effected without its consent.

       G.   NO RELEASE FOR FRAUD.  Nothing contained in this Agreement shall
relieve or limit the liability of a party or any officer or director of such
party from any Liability arising out of or resulting from common law fraud or
intentional misrepresentation in connection with the transactions contemplated
by this Agreement or in connection with the delivery of this Agreement.  Each
ActaMed Indemnitee or SBCL Indemnitee, as the case may be, shall have a right to
indemnification for any Loss incurred as the result of any common law fraud or
intentional misrepresentation by SBCL or ActaMed, respectively, or any officer
or director thereof.

       H.   Payment.

            1.   If any party is required to make any payment under this
Section XIV, such party shall promptly pay the Indemnified Party the amount so
determined.  If there is a dispute as to the amount or manner of determination
of any indemnity obligation owed under this Section XIV, the Indemnifying Party
shall nevertheless pay when due such portion, if any, of the obligation as shall
not be subject to dispute.  The difference, if any, between the amount of the
obligation 

                                       -35-
<PAGE>

ultimately determined as properly payable under this Section XIV and
the portion, if any, theretofore paid shall bear interest as set forth in
Section XIV.F.3.

            2.   Any items as to which an Indemnified Party is entitled to
payment under this Article may be paid by setoff against amounts payable to the
Indemnifying Party to the extent that such amounts are sufficient to pay such
items.

            3.   If all or part of any indemnification obligation under this
Agreement is not paid when due, then the Indemnifying Party shall pay the
Indemnified Party interest on the unpaid principal amount of the obligation from
the date the amount became due until payment in full, at the per annum rate of
interest announced from time to time by NationsBank South, N.A., to be its
"prime rate."

XV.    DISPUTE RESOLUTION; ARBITRATION.

       A.   GENERAL.  Except as otherwise provided in Section VI of this
Agreement, disputes between ActaMed and SBCL relating to the interpretation or
application of this provisions of this Agreement shall be resolved in accordance
with this Section XV.

       B.   INFORMAL DISPUTE RESOLUTION. Any dispute between the parties
arising out of or with respect to this Agreement, either with respect to the
interpretation of any provision of this Agreement or with respect to the
performance by ActaMed or SBCL, shall be resolved as provided in this Article.

            1.   Prior to the initiation of formal dispute resolution
procedures, the parties shall first attempt to resolve their dispute informally,
as follows:

                 a.   The Representatives for each party shall meet for the
purpose of endeavoring to resolve such dispute.  They shall meet as often as the
parties reasonably deem necessary in order to gather and furnish to the other
all information with respect to the matter in issue which the parties believe to
be appropriate and germane in connection with its resolution.  The
Representatives shall discuss the problem and negotiate in good faith in an
effort to resolve the dispute without the necessity of any formal proceeding. 
During the course of negotiations, all reasonable requests made by one party to
another for nonprivileged information, reasonably related to this Agreement,
shall be honored in order that each of the parties may be fully advised of the
other's position.

                 b.   If, within fifteen (15) days after a matter has been
identified for resolution pursuant to this Section XV, either of the
Representatives concludes in good faith that amicable resolution through
continued negotiation in this forum does not appear likely, the matter will be
escalated by formal written notification to the SBCL President and the ActaMed
President.  The parties will use their respective best efforts to cause the SBCL
President and the ActaMed President to meet to attempt to resolve the dispute.

                                       -36-
<PAGE>

                 c.   Formal proceedings for the resolution of a dispute may
not be commenced until the earlier of:  (i) the date on which the SBCL President
and the ActaMed President conclude in good faith that amicable resolution
through continued negotiation of the matter does not appear likely; or (ii)
thirty (30) days after the dispute has been referred to the SBCL President and
the ActaMed President.

            2.   The provisions of this Section XV shall not be construed to
prevent a party from instituting, and a party is authorized to institute, formal
proceedings earlier to avoid the expiration of any applicable limitations
period.

       C.   ARBITRATION.  If the parties are unable to resolve any controversy
arising under this Agreement as contemplated by Section XV.A and if such
controversy is not subject to Section XIV or Section XV.D, then such controversy
shall be submitted to mandatory and binding arbitration at the election of
either Party (the "DISPUTING PARTY") pursuant to the following conditions:

            1.   The Disputing Party shall notify the AAA and the other Party
in writing describing in reasonable detail the nature of the dispute (the
"DISPUTE NOTICE").  The parties shall each select a neutral arbitrator in
accordance with the rules of AAA and the two (2) arbitrators selected shall
select a third neutral arbitrator.  The three (3) arbitrators so selected are
herein referred to as the "PANEL."

            2.   The Panel shall allow reasonable discovery as permitted by the
Federal Rules of Civil Procedure, to the extent consistent with the purpose of
the arbitration.  The Panel shall have no power or authority to amend or
disregard any provision of this Section XV.  The arbitration hearing shall be
commenced promptly and conducted expeditiously, with each of ActaMed and SBCL
being allocated one-half of the time for the presentation of its case.  Unless
otherwise agreed to by the parties, an arbitration hearing shall be conducted on
consecutive days.

            3.   Should any arbitrator refuse or be unable to proceed with
arbitration proceedings as called for by this Section, such arbitrator shall be
replaced by an arbitrator selected in accordance with the rules of the AAA and
consistent with this Section XV.

            4.   The Panel rendering judgment upon disputes between parties as
provided in this Section XV shall, after reaching judgment and award, prepare
and distribute to the parties a writing describing the findings of fact and
conclusions of law relevant to such judgment and award and containing an opinion
setting forth the reasons for the giving or denial of any award.  The award of
the arbitrator shall be final and binding on the parties, and judgment thereon
may be entered in a court of competent jurisdiction.

            5.   Arbitration hearings hereunder shall be held in Washington
D.C. or other mutually agreeable location.

            6.   The Panel shall be instructed that time is of the essence in
the arbitration proceeding.  The Panel shall render its judgment or award within
fifteen (15) days following the 

                                       -37-
<PAGE>

conclusion of the hearing.  Recognizing the express desire of the parties for 
an expeditious means of dispute resolution, the arbitrator shall limit or 
allow the parties to expand the scope of discovery as may be reasonable under 
the circumstances.

       D.   LITIGATION.  In the event of a breach of the confidentiality
obligations set forth in this Agreement, or in the event a party makes a good
faith determination that a breach of the terms of this Agreement by the other
party is such that the damages to such party resulting from the breach will be
so immediate, so large or severe, and so incapable of adequate redress after the
fact that a temporary restraining order or other immediate injunctive relief is
a necessary remedy, then such party may file a pleading with a court seeking
immediate injunctive relief.  If a party files a pleading with a court seeking
immediate injunctive relief and this pleading is challenged by the other party
and the injunctive relief sought is not awarded in substantial part (or in the
event of a temporary restraining order is vacated upon challenge by the other
party), the party filing the pleading seeking immediate injunctive relief shall
pay all of the costs and attorneys' fees of the party successfully challenging
the pleading.

            1.   ActaMed and SBCL each consent to venue in Philadelphia,
Pennsylvania and to the nonexclusive jurisdiction of competent Pennsylvania
state courts or federal courts located in Philadelphia for all litigation which
may be brought, subject to the requirement for arbitration hereunder, with
respect to the terms of, and the transactions and relationships contemplated by,
this Agreement. 

XVI.   MISCELLANEOUS.

       A.   PUBLICITY.  Each party hereto agrees that neither it, nor or any of
its representatives, shall make any public announcement with respect to this
Agreement or the transactions contemplated hereby without the prior consent of
the other party hereto unless required by law or judicial process, in which case
notification shall be given to the other party hereto prior to such disclosure
and the content of such disclosure approved by such other party, which approval
shall not be unreasonably withheld or delayed.  Notwithstanding the foregoing,
ActaMed agrees that nothing in this Section XVI.A shall prohibit SBCL from
disclosing any information SBCL is permitted to disclose under Section X.D.

       B.   ENTIRE AGREEMENT.  This Agreement, including the Exhibits to it,
constitutes the entire understanding between the parties and supersedes all
proposals, communications and agreements between the parties relating to its
subject matter.  No amendment, change, or waiver of any provision of this
Agreement will be binding unless in writing and signed by both parties.

       C.   GOVERNING LAW.  This Agreement will be governed by and construed in
accordance with the laws of the State of Georgia applicable to contracts made
and performed therein.

       D.   ASSIGNMENTS.  Neither party may assign this Agreement without the
prior, written consent of the other party, which shall not be unreasonably
withheld; PROVIDED, HOWEVER, that SBCL may assign its rights and obligations
hereunder without approval of ActaMed to any of its affiliates, 

                                       -38-
<PAGE>

or an acquiror of substantially all of its assets; PROVIDED FURTHER that 
ActaMed may assign its rights and obligations under this Agreement without 
the approval of SBCL to any person that acquires all or substantially all of 
the business or assets of ActaMed related to the ActaLab Software and the 
Network, if such person (or any affiliate of such person) is not engaged in 
the business of providing laboratory testing services.  Any attempted 
assignment without such consent shall be void. If the parties cannot agree 
upon whether a company competes with SBCL for lab testing, the parties shall 
resolve the dispute pursuant to Section XV.  Any assignment with consent does 
not release the assigning party from any of its obligations under this 
Agreement unless the consent so states.

       E.   NOTICES.  Any notices relating to this Agreement shall be in
writing and will be sent by certified United States mail, postage prepaid,
return receipt requested, or by facsimile transmission or overnight courier
service, addressed to the party at the address set forth below, or at such
different address as a party has advised to the other party in writing and shall
be deemed given and received when actually received:

If to SBCL:

       SmithKline Beecham Clinical Laboratories, Inc.
       1201 South Collegeville Road                   
       Collegeville, Pennsylvania  19426
       Attention:  John B. Okkerse, Jr., Ph.D., President
       Telephone:  [*]
       Telecopy:  [*]

With a copy to: 

       SmithKline Beecham Corporation
       One Franklin Plaza
       16th and Race Streets
       Philadelphia, PA  19103
       Attention: General Counsel-U.S.
       Telephone:  [*]
       Telecopy:  [*]

If to ActaMed:

       ActaMed Corporation
       Suite 600
       7000 Central Parkway
       Atlanta, Georgia 30328
       Attention: Chief Financial Officer
       Telephone: (770)352-1600
       Telecopy: (770)352-1815



[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -39-
<PAGE>

with a copy to:

       Alston & Bird
       One Atlantic Center
       1201 West Peachtree Street
       Atlanta, Georgia  30309-3424
       Attention: John C. Weitnauer, Esquire
       Telephone:  (404) 881-7780
       Telecopy Number:  (404) 881-7777

       F.   SEVERABILITY.  In the event one or more of the provisions of this
Agreement are found to be invalid, illegal or unenforceable by a court with
jurisdiction, the remaining provisions shall continue in full force and effect.

       G.   FORCE MAJEURE.  The obligations of the parties under this Agreement
(other than the obligation to make payments) shall be suspended to the extent a
party is hindered or prevented from complying therewith because of labor
disturbances (including strikes or lockouts), war, acts of God, fires, storms,
accidents, governmental regulations, failure of vendors or suppliers or any
other cause whatsoever beyond a party's control.  For so long as such
circumstances prevail, the party whose performance is delayed or hindered shall
continue to use all commercially reasonable efforts to recommence performance
without delay.

       H.   COUNTERPARTS.  This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

            THIS AGREEMENT CONTAINS A BINDING ARBITRATION PROVISION THAT MAY BE
ENFORCED BY THE PARTIES.

                                       -40-
<PAGE>


     IN WITNESS WHEREOF, the parties have executed this Services Agreement as 
of the date set forth above.

                                ACTAMED CORPORATION


            
                                By:     /s/
                                   ---------------------------------------

                                Its:    President
                                    --------------------------------------

            
                                SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC. 



                                By:     /s/
                                   ---------------------------------------

                                Its:    President
                                    --------------------------------------


<PAGE>

                                      EXHIBITS
<TABLE>
<S>                   <C>
Exhibit A             -- Definitions-

Exhibit II.B.2(a)     -- Automated Provider Contract Amendment Provisions*

Exhibit II.B.2(b)     -- Automated Provider New Contract*

Exhibit III.B.7       -- Reports-

Exhibit III.C-1       -- Network Standards-

Exhibit III.C-2       -- Customer Support Standards-

Exhibit IV.G          -- Average Revenue/Requisition & Monthly 
                         Average Number of Requisitions*

Exhibit V.A.          -- Required Maintenance

Exhibit V.B.          -- Year 2000 Warranties

Exhibit VII.C-1       -- Current Connectivity Arrangements**

Exhibit VII.C-2       -- Exclusions to Preferred Vendor Status
</TABLE>

*  TO BE DELIVERED BY JANUARY 31, 1998.

** TO BE DELIVERED BY JANUARY 15, 1998.

<PAGE>

                                     EXHIBIT A
                                          
                                    DEFINITIONS


            "AAA" means the American Arbitration Association.

            "ActaLab Software" means the ActaLab Software as defined under the
License Agreement.

            [*] has the meaning set forth in Section XII.E.6 of the Services 
Agreement. 

            "ActaMed" means ActaMed Corporation, a Georgia corporation.

            "ActaMed Gateway shall have the meaning set forth in Section
II.A.1.

            "ActaMed Indemnitee" means ActaMed and its directors, officers,
employees,  affiliates and permitted assigns.

            "ActaMed Network" means the EDI system and network for electronic
Transmissions, which includes the Network Software and ActaMed's gateway and
hardware and computer systems needed to operate that software.

            "ActaMed President" shall mean the President of ActaMed, presently
Michael K. Hoover, or should ActaMed be restructured in any manner, the officer
of ActaMed having top authority over ActaMed's operations.

            "ActaMed Relationship Manager" shall have the meaning set forth in
Section XI.

            "ActaMed Site" means an Automated Provider utilizing the Network
for Lab EDI Services located in a transferred Region that was an SBCL Site on
the Transfer Date of the Region or is a New Site or [*].

            "Agreed Services" means all services to be rendered by ActaMed
under this Services Agreement, including without limitation Lab EDI Services.

            "Anniversary" shall mean the anniversary date of the Region One
Transfer Date.

            "Audit Rights" means the right to, or to have representatives, 

                      (1)  examine all books of account, records, reports and
other papers except to the extent that such action would, in the reasonable
opinion of counsel, constitute a waiver of the attorney/client privilege or
violate obligations of confidentiality to third parties,

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                      A-1
<PAGE>

                      (2)  make copies and take extracts from any thereof,
except for information which is subject to a written confidentiality agreement
with a third party,

                      (3)  discuss the affairs, finances and accounts of the
party being audited with such party's officers and independent certified public
accountants (and by this provision such audited party hereby authorizes said
accountants to discuss with the auditing party and its representatives, the
finances and accounts of such entity) and

                      (4)  visit and inspect, at reasonable times and on
reasonable notice during normal business hours, the properties of the other
party;

PROVIDED THAT, the foregoing audit rights are in addition to any rights of a
party under the Georgia Business Corporation Code in the case of ActaMed, or the
Delaware General Corporation Law in the case of SBCL, and shall in no way limit
such rights; and 

PROVIDED FURTHER THAT, the expenses incurred in connection with any such
inspection shall be for the account of the auditing party, except that all
reasonable expenses incurred by the audited party, or any of its officers,
employees, agents or independent certified public accountants, shall be
expenses payable by the audited party and shall not be expenses of the auditing
party. 

            "Automated Provider" means a Provider [*] who or which, on or
after the Transfer Date of the Region in which the Provider [*] is located,
uses the Network to send clinical laboratory test orders to an SBCL Lab or to
receive test result reports from an SBCL Lab.

            "Changes" means any improvements, changes or additions to
application software and documentation that improve existing functions, add new
functions, or improve performance through changes in the software or system
design or coding.

            "Claim" means any claim for indemnification under Section XIV of
the Services Agreement.

            "Claims Notice" means a written notice of an indemnification claim
delivered pursuant to Section XIV of the Services Agreement.

            "Confidential Information" means information that is (1)
confidential to the business of a party, including without limitation, data
regarding the extent of the Agreed Services provided hereunder to, or
Transaction Fees, Fixed Fees or PIFs paid hereunder by, SBCL, (2) is designated
and identified as such by such party, and (3) is not a Trade Secret; provided,
however, that Confidential Information does not include any information which is
or becomes generally known to the public without any breach by the Receiving
Party of its duties to the Disclosing Party.  Assuming that the foregoing
criteria are met, Confidential Information also includes information which has
been disclosed to a Receiving Party by another person and which the Receiving
Party is obligated to treat as confidential.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       A-2
<PAGE>

            "Customer Support Standards" has the meaning set forth in Section
III.C of the Services Agreement.

            "Development Agreement" means the Development Agreement between
SBCL and ActaMed dated October 31, 1997 for the initial development of the
ActaLab Software.

            "Disclosing Party" has the meaning set forth in Section X.C of the
Services Agreement.

            "Disease Management Business" shall have the meaning set forth in
Section VIII.D.

            "Dispute Notice" means a written notice by one party hereto
notifying the other of the existence of a dispute, which notice shall delineate
the disputed items and the factual basis for the dispute.

            "Disputing Party" has the meaning given in Section XV.B of the
Services Agreement.

            "EDI" means electronic data interchange.

            "Exclusive Developments" has the meaning set forth in Section
V.E.1.a of the Services Agreement.

            "First Variable Fee" has the meaning set forth in Section IV.C.1 of
the Services Agreement.

            "Fixed Fee" means the amounts payable by SBCL pursuant to Section
IV.A of the Services Agreement.

            "Fixed Fee Sites" has the meaning set forth in Section IV.G of the
Services Agreement.

            "FTE" means "full time equivalent," i.e., the equivalent number of
work hours that would be worked by one person working on a full time basis,
treating eight (8) hours worked per day as a full work day. 

            "Indemnifying Party" means the Party obligated to provide
indemnification pursuant to Section XIV of the Services Agreement.

            "Indemnitee" means an ActaMed Indemnitee or an SBCL Indemnitee.

            "Integrity Agreement" means SBCL's Corporate Integrity Agreement
with the OIG.

            "Intellectual Property" means copyrights, trademarks, service
marks, trade names, patents, applications therefor, technology rights and
licenses, computer software (including, without limitation, any source or object
codes therefor or documentation relating thereto), computer software licenses,
trade secrets, franchises, know-how, inventions and intellectual property
rights.

                                      A-3
<PAGE>

            "Key Performance Standards" shall mean the Performance Standards
under the headings of [*]

            "Lab EDI Services " means electronic connectivity services enabling
an Automated Provider to send Transmittal Information electronically to an SBCL
Lab and/or to receive electronically Transmittal Information from an SBCL Lab
utilizing the Network.

            "Liability" means any direct or indirect liability, indebtedness,
obligation, expense, claim, deficiency, guaranty or endorsement of or by any
person (other than endorsements of notes, bills and checks presented to banks
for collection or deposit in the ordinary course of business) of any type,
whether accrued, absolute, contingent, matured, unmatured or other.

            "License Agreement" means the License Agreement between SBCL and
ActaMed dated the date of the Services Agreement and described in the Preamble
to the Services Agreement.

            "Licensed Materials" means the software licensed pursuant to the
License Agreement.

            [*] has the meaning set forth in Section XII.E.4 of the Services 
Agreement.

            "Losses" means any and all demands, claims, actions or causes of
action, assessments, losses, diminution in value, damages (including special and
consequential damages), liabilities, costs, and expenses, including without
limitation, interest, penalties, cost of investigation and defense, and
reasonable attorneys' and other professional fees and expenses.

            [*] has the meaning set forth in Section XII.F of the Services 
Agreement.

            "Network" means the SCAN Network and/or the ActaMed Network.

            "Network Software" means ActaMed's personal computer version of the
ProviderLink and ActaLink presentation and network software programs, under
whatever name marketed, and the SCAN Software and the ActaLab Software, and all
Changes to them, which are licensed to Automated Providers and which allow
access to the Network for the transmission of laboratory test order entries and
reception of test result information, or other software program for use by
ActaMed in the transmission of test order entries and reception of test result
information which is licensed to Automated Providers.

            "Network Standards" shall have the meaning set forth in Section
III.C of the Services Agreement.

            "New Business Plan" shall mean the ActaMed business plan delivered
pursuant to Section 5.1.8 of the Purchase Agreement.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                      A-4
<PAGE>

            "New Site" shall mean an ActaMed Site added to the Network on or
after the Transfer Date of the Region in which the ActaMed Site is located and
which is not a Fixed Fee Site.

            "Office Space" has the meaning set forth in Section II.B.5 of the
Services Agreement.

            "OIG" means the Office of Inspector General, U.S. Department of
Health and Human Services.

            "Other Lab" means a commercial laboratory other than an SBCL Lab.

            "Oversight Committee" has the meaning set forth in Section III.A of
the Services Agreement.

            "Panel" has the meaning given it in Section XV.B of the Services
Agreement.

            "PC System" means the personal computer, modem, bar code readers,
bar code label printers, requisition and results printers and other hardware
peripherals required for a Provider to become an Automated Provider.

            [*] means an SBCL [*] or other [*].

            "Performance Standards" shall have the meaning set forth in Section
III.C of the Services Agreement.

            "PIF Amount" has the meaning given it in Section IV.C.2 of the
Services Agreement.

            "PIF Number" has the meaning given it in Section III.B.3 of the
Services Agreement.

            "PIF Sites" has the meaning given it in Section III.B.3 of the
Services Agreement.

            [*] or "PIF" has the meaning given it in Section IV.M.1 of the 
Services Agreement.

            "Provider" means a physician, clinic, hospital, or other provider
of clinical health care services other than [*].

            "Purchase Agreement" means the Asset Purchase Agreement between
ActaMed and SBCL dated the date of the Services Agreement and described in the
Preamble to the Services Agreement.

            "Receiving Party" has the meaning given it in Section X.C of the
Services Agreement.

            "Region" means any one of Region One, Region Two, Region Three, or
Region Four.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                      A-5
<PAGE>

            "Region Four" means the Region described on Schedule 2.2(d) to the
Purchase Agreement.

            "Region Four Transfer Date" has the meaning given in Section 2.3.4
of the Purchase Agreement.

            "Region One" means the Region described on Schedule 2.2(a) to the
Purchase Agreement.

            "Region One Transfer Date" means the date on which Region One is
transferred to ActaMed pursuant to the Purchase Agreement.

            "Region Three" means the Region described on Schedule 2.2(c) to the
Assets Purchase Agreement.

            "Region Three Transfer Date" has the meaning given in Section 2.3.3
of the Purchase Agreement.

            "Region Two" means the Region described on Schedule 2.2(b) to the
Purchase Agreement.

            "Region Two Transfer Date" has the meaning given in Section 2.3.2
of the Purchase Agreement.

            "Regulation" means any statute, law, ordinance, regulation,
requirement, order or rule of any federal, state, local government or other
governmental agency or body or of any other type of regulatory body, or any
governmental or administrative interpretation of any thereof, including, without
limitation, (i) those covering health, safety, environmental, energy,
transportation, bribery, record keeping, zoning, antidiscrimination, antitrust,
wage and hour, and price and wage control matters, (ii) requirements imposed by
any governmental or regulatory body which must be satisfied to qualify for
Medicare reimbursements, and (iii) any and all federal, state and local health
care laws relating to or covering the methods and ways in which Lab EDI Services
and other related or incidental services or benefits, if any, are provided to
the Automated Providers, including, but not limited to, the Stark law (42 U.S.C.
Section 1395nn) and the Clinical Laboratory Improvements Act of 1988, as
amended.

            [*] has the meaning set forth in Section IV.G of the Services 
Agreement.

            [*] has the meaning set forth in Section IV.G.2 of the Services 
Agreement.

            "Representatives" means the ActaMed Relationship Manager and the
SBCL Relationship Manager.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                      A-6
<PAGE>

            "Requisition" shall mean an electronically transmitted clinical 
laboratory test order from an Automated Provider to SBCL which is entered 
utilizing SCAN Software, the ActaLab Software or other program for electronic 
lab order entry and results reporting and utilizing the Network, for one or 
more clinical laboratory tests for a single patient transmitted 
electronically at one time and the corresponding test results delivered 
electronically to an Automated Provider from SBCL at one or more times.  The 
term "Requisition" shall include patient eligibility for third party payor 
benefits or reimbursement or claim status checking related to such order and 
available to ActaMed.

            "SBCL" means SmithKline Beecham Clinical Laboratories, Inc., a
Delaware corporation.

            "SBCL Access" has the meaning set forth in Section X.B.2 of the
Services Agreement.

            "SBCL Indemnitee" means SBCL and its directors, officers,
employees, affiliates and permitted assigns.

            "SBCL Lab" means any location at which SBCL or its affiliates
provide, or may in the future provide, clinical laboratory testing services,
regardless of the computer systems or software, if any, used by such lab for lab
order entry and results reporting.

            "SBCL President" shall mean the President of SBCL, presently
John B. Okkerse, Jr., Ph.D., or should SBCL be restructured in any manner, the
officer of SBCL having top authority over SBCL's operations.

            "SBCL Relationship Manager" has the meaning set forth in Section XI
of the Services Agreement.

            "SBCL Site" means an Automated Provider utilizing the SCAN Network
for Lab EDI Services on the Transfer Date of the Region in which such Automated
Provider is located.

            "SCAN Assets" has the meaning set forth in the Purchase Agreement.

            "SCAN Developments" has the meaning set forth in the License
Agreement.

            "SCAN Network" means the SCAN Software and SBCL's gateway and 
hardware and computer systems needed to operate the SCAN Software, excluding 
[*] which enables Providers or [*] to place laboratory test orders 
electronically to an SBCL Lab and/or to receive test result reports 
electronically from an SBCL Lab.

            "SCAN PSC" means a PSC which utilizes the Network to enter
laboratory test orders electronically and/or to receive test result reports
electronically.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       A-7
<PAGE>

            "SCAN Site" means either an SBCL Site or an ActaMed Site that has
installed and is using SCAN Software for Lab EDI Services.

            "SCAN Software" means the SBCL SCAN-TM- software licensed to
ActaMed pursuant to the License Agreement, and all Changes thereto after the
date hereof.

            "Second Variable Fee" has the meaning set forth in Section IV.C.2
of the Services Agreement.

            [*] has the meaning set forth in Section XII.E.5 of the Services 
Agreement.

            "SOP" means a standard operating procedure.

            "Termination Transition"  has the meaning given it in Section XII.D
of the Services Agreement.

            "Third Party Claim" means any claim, suit or proceeding (including,
without limitation, a binding arbitration or an audit by any taxing authority)
that is instituted against an Indemnitee by a person or entity other than an
Indemnitor and which, if prosecuted successful, would result in a Loss for which
such Indemnitee is entitled to indemnification hereunder.

            "TopLab" means SBCL's proprietary laboratory systems which
facilitate SBCL's internal automated laboratory test processing and reporting,
including but not limited to SBCL's Total Order Processing Laboratory system.

            "Trade Secrets" means information related to the Disclosing Party
(1) which derives economic value, actual or potential, from not being generally
known to or readily ascertainable by other persons who can obtain economic value
from its disclosure or use, and (2) which is the subject of efforts by the
Disclosing Party that are reasonable under the circumstances to maintain its
secrecy.  Without limitation, for ActaMed, ProviderLink and the ActaLab Software
are Trade Secrets, and for SBCL, the SBCL Software, SCAN Developments and
TopLab are Trade Secrets.

            "Transaction Fee Amount" has the meaning set forth in Section
IV.C.1 of the Services Agreement.

            "Transaction Fees" has the meaning set forth in Section IV.B of the
Services Agreement.

            "Transfer Date" shall mean any one of, and "Transfer Dates" shall
mean more than one of the Region One Transfer Date, the Region Two Transfer
Date, the Region Three Transfer Date, and the Region Four Transfer Date.

            "Transferred Employees" shall have the meaning given such term in
the Purchase Agreement.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       A-8
<PAGE>

            "Transmission" means the electronic transmittal over the Network of
Transmittal Information in an approved document format.

            "Transmittal Information" means information which an Automated
Provider gives ActaMed for communication to SBCL over the Network, or which SBCL
gives ActaMed for communication to an Automated Provider over the Network,
including all copies of same, and including without limitation, data relating to
laboratory records, clinical data, encounter data, test information, test codes
and provider identification numbers (other than UPINs)

            "Variable Fees" has the meaning given it in Section IV.C.2 of the
Services Agreement.


                                       A-9

<PAGE>




                                 EXHIBIT II.B.2(a)
                                          
               LAB EDI SERVICE AGREEMENT AMENDMENT PROVISIONS
                                          
                                          















                                III.B.2-1

<PAGE>





                                  EXHIBIT II.B.2(b)

                              LAB EDI SERVICE AGREEMENT













                                III.B.7-1

<PAGE>

                                EXHIBIT III.B.7

                                 REPORTS


       A.   REPORTS ACTAMED WILL PROVIDE TO SBCL

            The following reports will be provided to SBCL by ActaMed on the
indicated schedule.

            1.   BILLING REPORTS

                 a.   [*] SUMMARY REPORTS (POST-ACTAMED GATEWAY):

                      (1)  Fixed Fee Sites

                           (a)  Total Sites

                           (b)  Total Requisitions

                           (c)  Average Requisitions per Site

                      (2)  Transaction Fee Sites

                           (a)  Total Sites

                           (b)  Total Requisitions

                           (c)  Average Requisitions per Site

                      (3)  PIF Sites

                           (a)  Total Sites charged for the [*] that [*] 
                                (with appropriate supporting detail)

                      (4)  Label Printer Fees

                           (a)  Total Sites charged for the Label printer
                                equipment fee (with appropriate supporting
                                detail)

                 b.   [*] DETAILED FEES:

                      (1)  List of Fixed Fee sites by lab

                      (2)  List of Transaction Fee sites by lab


                                III.B.7-1

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

<PAGE>

                      (3)  List of PIF Sites by lab

                      (4)  List of sites with bar code printer paid by SBCL by
                           lab

                 c.   CUSTOM DEVELOPMENT:

                      (1)  Monthly itemization and accounting for the hours
                           worked for any projects active under a Custom
                           Development Fee, and a project status report on each
                           item worked

                 d.   MONTHLY EXPENSE BILLINGS:

                      (1)  Personnel in non-transferred regions, with
                           supporting detail

            2.   PERFORMANCE REPORTS

                 a.   All reports necessary to verify and measure the
                      Performance Standards, including, but not limited to, the
                      following:  (i) [*] help desk REPORTS, as set forth
                      in Exhibit III.C-2 - Customer Support Standards showing
                      performance statistics against the Performance Standards
                      and the number of calls received by type of problem
                      (detail problem coded); (ii) [*] network reports, as
                      set forth in Exhibit III.C-1 - Network Standards; (iii)
                      Performance Metrics reports against the Performance
                      Standards described in Exhibit III.C-1 & 2, including
                      comparison of actuals to standard for current month and
                      rolling prior 12 months.

                 b.   Transfer BENCHMARK reports, as set forth in Exhibit
                      2.3.1(a) of the Assets Purchase Agreement.

                 c.   Monthly Gateway reports (format to be mutually determined
                      once the ActaMed GATEWAY is active, but intended to be
                      generally similar to the SBCL November 1997 Gateway
                      Report).

                 d.   As APPROPRIATE from time to time, in light of
                      technological advances, market conditions or industry
                      standards or other facts and circumstances, a report
                      describing ActaMed's plans to increase the performance
                      and capabilities of the Network and to improve Customer
                      Service beyond the minimum levels specified in Exhibits
                      III.C-1 and III.C-2.

                 e.   Monthly report of SBCL clients that have deinstalled
                      (discontinued to use) Lab EDI Services.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                III.B.7-2

<PAGE>

                 f.   An ongoing data base (to be created, kept current and
                      available for reporting) report of the current list of
                      clients approved for installation including date
                      received, Lab, Client ID, Client demographics and
                      expected date of installation.

            3.   SAS 70 REPORT

                 ActaMed will provide a report produced in accordance with
standards established by the American Institute of Certified Public Accountants'
Statement on Auditing Standards Number 70:  Reports on the Processing of
Transactions by Service Organizations.  ActaMed shall submit the first such
report to SBCL by the end of 1998.

       B.   REPORTS SBCL WILL PROVIDE TO ACTAMED

            1.   BILLING REPORTS

                 A.   SBCL WILL MAKE AVAILABLE TO ACTAMED ACCESS TO DATA
                      RELATING TO:

                      (1)  Fixed Fee Sites

                      (2)  Total Sites (list of Fixed Fee Sites by Lab active
                           that month)

                      (3)  List of Transaction Fee sites by Lab

                 B.   FOLLOWING ACTAMED GATEWAY, MONTHLY EXPENSE BILLINGS (with
                      appropriate SUPPORTING detail):

                      (1)  Gateway 1-800 charges to ActaMed

                      (2)  Non-transferred local line charges

                      (3)  Service Fees for ongoing support of ActaMed Gateway,
                           if any

                      (4)  Service Fees for SBCL Gateway Services for
                           Transferred Sites, if any

            2.   PERFORMANCE REPORTS

                 a.   Prior to the ActaMed Gateway, SBCL will continue to
                      provide ActaMed with copies of its standard monthly
                      Gateway report.

                 b.   Timely reports on changes in SBCL that affect ActaMed and
                      its PERFORMANCE hereunder, as set forth in Section IX.

                                III.B.7-3

<PAGE>

            3.   STRATEGIC INFORMATION

                 Quarterly information on major trends within SBCL as
appropriate that are relevant to ActaMed and its performance hereunder, such as
new customers, lost customers, trends in lab requisition and result volumes,
compliance related issues, etc.





                                III.B.7-4

<PAGE>

                                  EXHIBIT III.C-1
                                          
                             NETWORK SUPPORT STANDARDS


ACTAMED NETWORK AVAILABILITY

The ActaMed Network will be available 24 hours a day, 7 days a week with the
exception of Planned Down Hours.  "Planned Down Hours" means that time which is
reasonably required for maintenance and problem resolution as reasonably
required and notwithstanding any other provision herein shall only occur during
the hours of [*] or on Federally recognized holidays.


HARDWARE AND MODEM AVAILABILITY

For each month, ActaMed shall maintain an "Availability Percentage" of at 
least [*].  Hardware systems and modems are operational and available for 
receiving/accepting calls as measured by an ActaMed systems management and 
monitoring tool [*].  Hardware specifically includes the ActaMed host 
machines required to process Lab EDI Services transactions, ActaMed 
provisioned modems and circuit termination equipment servicing Automated 
Providers using the ActaMed Network, and other third party provisioned 
dial-in access service and devices relevant to the Lab EDI Services.  

The "Availability Percentage" for Lab EDI Services shall be calculated on [*] 
and will be based on data gathered through an automated Systems Management 
and Reporting tool [*]. Similar automated measurement and reporting will be 
implemented as soon as is practical for SCAN Sites transferred to the ActaMed 
Gateway, but not later than 180 days following such transfer of the first 
SCAN Site to the ActaMed Gateway.  The Availability Percentage is calculated 
as set forth below:

       -    Defined Hours are the total days in the month multiplied by 24
            hours.

       -    Unplanned Hours are the  hours experienced during the month in
            which the ActaMed Network is not operable or otherwise not properly
            transmitting valid Transmission as provided in the Agreement
            excluding Planned Down Hours.

       -    Actual Hours are the Defined Hours minus the Unplanned Hours.

       -    Availability Percentage is determined by dividing the Actual Hours
            by Defined Hours and multiplying the result by 100.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                III.C-1-1

<PAGE>

SUCCESSFULLY DELIVERED CALLS

For each month, ActaMed shall maintain a "Successfully Delivered Call 
Percentage"  of at least [*].  The "Successfully Delivered Call Percentage" is
the total of all Successfully Delivered Calls divided by the total of attempted
calls from all sources and multiplying the result by 100.

A Successfully Delivered Call shall mean a call made to ActaMed's premise
equipment from any source for the purpose of processing Lab EDI Services. as to
which ActaMed's equipment successfully offers service, to be measured by the
call service provider's equipment facilities including:

       -    calls delivered by an Interexchange Carrier ("IXC"), such as
            Sprint, AT&T, Worldcom, etc., using toll-free dial-in service to
            will be measured by the IXC carrier switch;

       -    calls delivered by a third party dial-in access provider will be
            measured by the management capabilities of that provider's modem
            pool; and

       -    calls delivered by a local service provider or by dedicated 
            toll-free dial-in service will be measured by ActaMed's 
            terminating premise equipment.


MODEM CONNECTIVITY 

For each month, ActaMed shall maintain a "Modem Connectivity Percentage" of at
least [*].  The "Modem Connectivity Percentage" is determined by dividing the
total number of Successfully Connected Calls by the total of Successfully
Delivered Calls and multiplying the result by 100.

A Successfully Connected Call is a Successfully Delivered Call that establishes
and maintains successful modem connection as determined by the statistics
generated by the management and reporting functionality of the ActaMed
terminating modem bank and/or third party dial-in access equipment.


TRANSACTION PROCESSING 

ActaMed acknowledges and agrees that all Transactions meeting the 
requirements set forth next to one or both of the bullet points below 
("Proposed Transaction") will be processed by the ActaMed Network.  If 
Proposed Transactions are not being processed by the ActaMed Network, it will 
be treated as a Severity 1 problem.  It is expected by the Parties that [*] 
of connected and Proposed Transactions will be successfully processed within 
ActaMed Network. 

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                III.C-1-2

<PAGE>

- -      Any order transactions that are entered according to the applicable
       specifications and edits of the Lab EDI software such as SCAN Software
       or ActaLab Software or any other ordering software module approved by
       ActaMed and SBCL that is connected to the ActaMed Network for the
       purposes of entering lab orders and upon completion of the order entry
       indicates to the operator that the order has been accepted for
       Transmission to SBCL; and

- -      Any result transactions transmitted by SBCL systems in accordance with
       applicable specifications and containing sufficient information to allow
       the ActaMed Network to determine the approved system to which the
       transaction is to be delivered.

[*]

[*]  The Parties agree that this is not a currently automated measurement and 
is not included as a requirement of Section III.B.7, Reports.

HISTORICAL DATA FOR RE-TRANSMISSION

ActaMed will store all result transmission data on, and make it available in
accordance with the Services Agreement via, the ActaMed Gateway for a minimum of
[*].

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                III.C-1-3
<PAGE>

                                  EXHIBIT III.C-2

                             CUSTOMER SUPPORT STANDARDS

ACTAMED HELP DESK

The ActaMed Help Desk for all Lab EDI Services will be staffed Monday through 
Friday 8:00 AM to 8:00 PM EST excluding federally recognized holidays. Issues 
of any severity level can be reported during this time via any one of the 
following methods:

     -      Telephone via ActaMed toll-free service (800 line); 
     -      FAX;
     -      Internet e-mail to ActaMed help desk personnel; or 
     -      Internet e-mail directly into the ActaMed Help Desk call tracking
            system.

In addition, 

     -      Internet web pages are being constructed to answer frequently asked
            questions;
     -      By special arrangement, limited direct access to the ActaMed Help
            Desk call tracking system is possible; and
     -      Using Internet e-mail and the assigned tracking number, the status
            of calls can be retrieved at any time.

There shall be after hours support, which is typically limited to issues that 
are defined as Severity 1 or Severity 2 as further defined below. These are 
either issues that involve multiple users and major communications or systems 
failures, or problems involving an outage of a single Automated Provider 
(i.e. non-critical issues such as training questions, enhancement requests 
and usage questions are usually handled during normal help desk hours.)  
Service is initiated by calling the main Help Desk 800 number and leaving a 
detailed message. Voice mail left after hours or on holidays will result in a 
page to the appropriate on call analyst who will retrieve the message and 
return the call and immediately initiate investigatory and corrective actions 
as appropriate in accordance with Severity Levels.


                                   III.C-2-1
<PAGE>

CALL TRACKING

Beginning at such time as the ActaMed SCAN help desk begins to accept client
calls from ActaMed Sites, which shall occur at a date mutually agreed upon by
the parties, all calls made to the ActaMed SCAN Help Desk will be logged into
ActaMed's "Support Magic" call tracking system, and will include at a minimum
the following information:

     -    Site ID (Machine ID)
     -    Site Name
     -    Caller Name
     -    Phone Number
     -    Local Lab 
     -    Date of Call
     -    Time of Call
     -    Problem Code / Description
     -    Call Recipient / Analyst
     -    Problem Definition
     -    Call Status
     -    Solution Code / Clear Description of final resolution
     -    Severity Code
     -    Date and time of final resolution

ActaMed shall be responsible only for calls related to ActaMed Sites.  Calls
from all other SCAN sites will continue to be supported by SBCL and will
continue to be tracked by SBCL processes as in force at that time.


SEVERITY CODES

Help Desk calls will be logged and appropriate escalations will be made based
upon severity codes assigned to each call. It is the responsibility of the
analyst handling the call to assign the severity level in accordance with the
severity level definitions described below.  The definition of each


                                 III.C-2-2
<PAGE>

severity level and the classification of call types into severity levels will 
initially be as set forth below, with more specific definitions to be 
determined through negotiation between ActaMed and SBCL.  The definitions may 
be reassessed and are subject to change by mutual consent of the Parties.  
The ActaMed Help Desk's method of classifying calls into priority levels will 
be reviewed periodically with the Oversight Committee.  SBCL will be 
responsible for defining additional situations and communicating to ActaMed 
any requests on how to classify particular call situations.

SEVERITY 1

       DEFINITION: A critical system or component is down or experiencing
       degraded service causing SBCL or a customer's business functions to be
       halted.  Severity I issues will typically involve major system outages
       that affect the service provided to many users.

       REQUIRED ACTION: Immediate notification to those persons identified in
       the Crisis Management document. [*] of Severity 1 issues should be
       resolved within [*] with [*] updates between ActaMed and SBCL.

SEVERITY 2 

       DEFINITION: A single user is down; a component is experiencing degraded
       service; consumable supplies are unavailable and does not have a
       critical impact on the business, but may restrict function to some users
       and may impact normal business operations.

       REQUIRED ACTION: The help desk will asses the situation and verify that
       setup or configuration problems are not the cause. After the original
       assessment has been made, an ActaMed CIS representative will normally be
       dispatched to correct or replace the failing component. In remote areas
       where localized support is not available, a replacement component will
       be shipped for next day delivery, and arrangements will be made to
       provide assistance setting up or installing that component. 
       Arrangements will also be made to remove or arrange for the removal of
       the failed component. [*] of Severity 2 calls should be resolved within
       [*] with updates to the affected user every [*] or less.

SEVERITY 3

       DEFINITION: A user's system is still operating but is experiencing
       difficulties or a specially requested deliverable is unavailable.

       REQUIRED ACTION: The Help Desk will make every attempt to resolve the
       issue over the phone or using the tools available to them. If those
       attempts are not successful, a ActaMed CIS representative might be
       called upon to resolve the issue on site, but these issues will
       typically have a lower priority than the Severity 2 issues listed above.
       [*] of Severity 3 calls will be resolved within [*] with updates to
       the affected user every [*] or less.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                 III.C-2-3
<PAGE>

NEW SITE INSTALLATION

In accordance with the agreed upon procedures for installing New Sites (or [*]
Sites) that SBCL requests or approves for Lab EDI Services, ActaMed will:

      -     If required, phone line installation and new service will be
            ordered on behalf of the Provider or SBCL on average within [*] of
            receipt of new site notification and,
      -     Provide installation and training, including any hardware required
            under Section IV.L of the Services Agreement, to properly prepare
            and set up the new client to use Lab EDI Services within [*] of 
            receipt of new site notification and phone line availability; or
      -     PIF Sites will be installed within [*] from the time the 
            notification is received and phone service is available.

except that, (i) delays caused by the practice management system vendor or the
Provider, shall not be the responsibility of ActaMed; and (ii) SBCL and ActaMed
will, when necessary, cooperate in the development of site installation
schedules to reflect periods of high volumes of new installations and remote
installations (usually requiring air travel).

DE-INSTALLATIONS

When required by the Assets Purchase Agreement or this Agreement, ActaMed 
will deinstall any Automated Provider within [*] of receipt of SBCL's 
deinstallation request.  Re-deployment of the deinstalled PC System for Lab 
EDI Services  will be in accordance with Section IV of the Services Agreement 
and in accordance with the performance metrics of a New Site.

RETAINING

ActaMed will provide ongoing training support in a manner and at such frequency
as is reasonably required to maintain client satisfaction and ability to
continue to use Lab EDI Services effectively to process laboratory transactions.


SCAN CONSUMABLE SUPPLIES

ActaMed will provide, [*] consumable supplies required by all ActaMed Sites 
for use of Lab EDI Services including printer paper, toner cartridges, backup 
tape cartridges and labels that meet SBCL label specifications.  ActaMed will 
deliver or arrange for delivery of these as required for uninterrupted use of 
Lab EDI Services.  Client requests for such supplies that prevent use of Lab 
EDI Services will be considered a Severity [*] problem.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                 II.C-2-4
<PAGE>

MEASUREMENTS AND REPORTING

Measurement will begin when the problem is received by the ActaMed Help Desk at
which time it will be recorded into the computerized on-line problem management
tool.  Measurement will end when the call is resolved satisfactorily and closed
by the ActaMed Help Desk representative.  In the case of calls that have been
forwarded to an SBCL facility for questions or issues not covered by the ActaMed
Help Desk, the ActaMed Analyst will, except in those cases where the problem
determination or resolution is clearly the responsibility of SBCL because of the
nature of the call, take ownership of that call and follow it through any other
path it may take. So long as SBCL provides the information needed to resolve
such a call, ActaMed will also be made to document that call and close it out
with a detailed explanation of the final resolution. Where it is not possible
for the ActaMed Analyst to remain "on the call", it is the responsibility of the
SBCL personnel to notify the ActaMed Help Desk if the outcome is to be
documented in the help desk system.

Other measurements that will be made available on a monthly basis will come from
the ACD system. The variety of reports available based upon the call tracking
system and the ACD statistics will include:

<TABLE>
<CAPTION>
        REPORT                         TARGET SERVICE LEVEL
        ------                         --------------------
        <S>                            <C>
        Number of calls by category    N/A, will vary

        Calls by region                N/A, will vary

        Abandoned call rate            *

        Average hold time                [*] 
</TABLE>

*  since there is no currently available SBCL baseline to be used to set
reasonable standards, ActaMed will record these metrics from the beginning of
its operations of the help desk.  After the first four months of help desk
operation, ActaMed and SBCL will evaluate performance and set mutually-agreeable
metrics based on SBCL's actual performance and generally accepted performance
standards for similar services.  In no case shall such metrics result in
standards lower than those generally found in the industry for similar services.

The percent of calls closed within the time frame objectives will be measured by
calculating, by priority level, the volume of calls closed within the time frame
objectives as a percentage of total calls opened.

The ActaMed Help Desk will use best efforts to accommodate any requests for
additional information as long as the collection of the information does not add
significant time and effort in logging the call.  The ActaMed Help Desk
statistics will be reported to SBCL on a monthly basis. The means of
distribution is yet to be determined.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                 III.C-2-5
<PAGE>

SATISFACTION LEVELS

For each year during the term of the Services Agreement, ActaMed will perform
client satisfaction surveys assessing Automated Providers' satisfaction with
ActaMed's Lab EDI Services.  The format and content of the annual surveys shall
be determined by ActaMed except that ActaMed will afford SBCL reasonable
opportunity to review and comment thereon prior to its use.  The annual survey
will be conducted at annual intervals.


















                                 III.C-2-6
<PAGE>



                                    EXHIBIT IV.I

                       AVERAGE REVENUE/REQUISITION & MONTHLY
                           AVERAGE NUMBER OF REQUISITIONS















                                       IV.I-1
<PAGE>

                                    EXHIBIT V.A

                                    MAINTENANCE

ActaMed will provide SBCL with the following hardware, network and application
(product) maintenance services which will be performed by ActaMed staff not
dedicated to SBCL enhancements.  The cost of these maintenance services are
provided as a part of the annual Fixed Fee and Transaction Fees, and include the
following:

PRODUCT MAINTENANCE

- -      Maintenance of the Network through both emergency and routine bug fixes
       and scheduled maintenance releases;

- -      Such changes and modifications to the Network required to manage
       scalability and capacity issues associated with increased transaction
       volumes;

- -      Provision of  routine, updated application documentation and training
       materials;

- -      Provision of periodic product updates to improve usability and to
       improve existing features and functionality.

PERFORMANCE

- -      Maintenance, monitoring and reporting of hardware, network and
       communication systems regarding stability and performance as specified
       in Exhibit III.C-1 Network Standards;

- -      Changes required to maintain above service level commitments, including
       changes and modifications required to manage scalability and capacity
       issues associated with increased transaction volumes;

- -      Technology upgrades to the Network (to include such things as fault
       tolerance produces and services) will be included as part of ongoing
       maintenance; and 

- -      Maintenance of appropriate connectivity to SBCL host systems to maintain
       security provisions and the data integrity of Transmissions.


                                   IV.I-2
<PAGE>

                                    EXHIBIT V.B
                                          
                                YEAR 2000 WARRANTIES


ActaMed warrants that the SCAN Software and ActaLab Software as compiled on any
hardware and operating system platform designated in its documentation
("Platforms") will satisfy all of the following:

            (a)  Such software will properly process date-related information
from different centuries (19th through 21st). Results utilizing such software
will be consistent and correct whether or not dates being processed span
different centuries and will be given with the proper indication of century.

            (b)  Data involving date information which will be generated from
use of the software will be coded in a manner that captures, stores and displays
date-related information so that the software will properly access and process
the data regardless of the century involved.

            (c)  The software will properly process date-related data which had
been generated by previous versions of thereof regardless of the century
involved.

            (d)  The software interfaces with the operating system and other
software, and with devices, will properly exchange and use date-related
information regardless of the century involved, so long as such other software,
systems and devices provide date-related information in a compatible format. 

            (e)  The software will check any date-related information provided
by the user, and by any devices, systems or software with which the software
interfaces, and will reject any date-related information which is not provided
in a format which the software will properly process. When data is rejected, the
software will generate an explanatory error message.

            (f)  The software will not have a feature which will cause it to
stop operating or to limit or alter its functions or performance because of a
date or time extending beyond 11:59:59 p.m. on December 31, 1999.

            (g)  The software will process information relating to years
beginning with 2000 properly, including recognizing that the year 2000 and every
fourth year thereafter is a leap year.

            (h)  The software (including but not limited to, runtime systems)
will function correctly if executing at the moment when the year changes from
1999 to 2000.  The software setup and updates will not be affected by the
century change.


                                     V.B-1
<PAGE>

                                  EXHIBIT VII.C-1
                                          
                         CURRENT CONNECTIVITY ARRANGEMENTS


                      EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Production          No          No           Yes            No      Computer Based Patient Record
        [*]             Specs Sent          No          No           Yes            No      Physician Practice
        [*]              Dormant            No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]            Letter Sent          No          No           Yes            No      Physician Practice
        [*]             Production          No          No           Yes            No      Vendor Lab
        [*]             Production          No         Yes            No            No      Medical Network
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      ESRD
        [*]              Dormant            No          No           Yes            No      Medical Network
        [*]             Specs Sent          No          No           Yes            No      Medical Network
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]            Letter Sent          No          No            No            No      Unknown
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Production          No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]            Letter Sent          No         Yes            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]            Letter Sent          No         Yes            No            No      CLinic
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      ESRD
        [*]             Specs Sent          No         Yes            No            No      CLinic

</TABLE>
 
[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      VII.C-1-1
<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]             Production          No          No           Yes            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]             Production          No          No           Yes            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]                Beta             No         Yes            No            No      Charting Program
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]           Section I Sent        No          No            No            No      CLinic
        [*]             Specs Sent          No          No           Yes            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      ESRD
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]              Dormant            No         Yes            No            No      Nursing Home
        [*]            Development          No         Yes            No            No      Computer Based Patient Record
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Production          No         Yes            No            No      ESRD

</TABLE>
 
[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                      VII.C-1-2

<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      CLinic
        [*]              Dormant            No          No            No            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]            Development          No          No           Yes            No      Physician Practice
        [*]             Production          No         Yes            No            No      Unknown
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No           Yes            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]             Specs Sent          No          No           Yes            No      CLinic
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]            Letter Sent          No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]             Production          No          No           Yes            No      Occupational Health
        [*]                                 No          No            No            No      Unknown
        [*]             Production          No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Vendor Lab

</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                    VII.C-1-3
<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Production          No         Yes            No            No      Medical Network
        [*]             Production          No         Yes            No            No      Medical Network
        [*]              Dormant            No          No           Yes            No      Medical Network
        [*]              Dormant            No          No           Yes            No      Medical Network
        [*]            Development          No          No           Yes            No      Medical Network
        [*]             Specs Sent          No          No           Yes            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]            Letter Sent          No          No            No            No      Unknown
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Specs Sent          No          No           Yes           Yes      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      CLinic
        [*]             Specs Sent          No          No           Yes            No      Interface Engine
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Medical Network
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]             Specs Sent          No          No            No            No      Physician Practice
        [*]             Specs Sent          No          No           Yes            No      Interface Engine
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]              Dormant            No          No            No            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]             Specs Sent          Yes         No            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Unknown

</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                    VII.C-1-4
<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Production          No          No           Yes           Yes      Medical Network
        [*]             Production          No         Yes            No            No      ESRD
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]            Development          No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      ESRD
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]            Development          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No           Yes            No      Physician Practice
        [*]             Production          No         Yes            No            No      Medical Network
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Clinical Trials
        [*]            Letter Sent          No          No            No            No      Unknown
        [*]            Development          No          No           Yes            No      Medical Network
        [*]             Production          No          No           Yes            No      Occupational Health
        [*]            Development          No         Yes            No            No      Physician Practice
        [*]                Beta             No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No           Yes            No      Medical Network
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]            Development          Yes         No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]            Development          No          No           Yes            No      Physician Practice
        [*]            Letter Sent          No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      Physician Practice

</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                    VII.C-1-5
<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Specs Sent          No          No            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Vendor Lab
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Medical Network
        [*]                 QA              No          No           Yes           Yes      Physician Practice
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No           Yes            No      CLinic
        [*]             Specs Sent          No          No           Yes            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]             Production          No          No           Yes           Yes      Physician Practice
        [*]            Letter Sent          No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]             Production          No          No           Yes            No      ESRD
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]                Beta             No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]            Letter Sent          No         Yes            No            No      Unknown
        [*]            Development          No          No           Yes            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Physician Practice

</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                    VII.C-1-6
<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]              Dormant            No          No           Yes            No      Vendor Lab
        [*]            Letter Sent          No          No           Yes            No      Physician Practice
        [*]            Letter Sent          No         Yes            No            No      Medical Network
        [*]              Dormant            No          No            No            No      Unknown
        [*]             Specs Sent          No          No           Yes            No      Vendor Lab
        [*]             Specs Sent          No          No           Yes            No      Computer Based Patient Record
        [*]             Specs Sent          No          No            No            No      Physician Practice
        [*]            Development          No         Yes            No            No      Physician Practice
        [*]                                 No         Yes            No            No      Unknown
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Production          No          No           Yes            No      Vendor Lab
        [*]                                 No         Yes            No            No      ESRD
        [*]             Specs Sent          No         Yes            No            No      Pharmaceutical Services
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]             Production          No          No           Yes            No      CLinic
        [*]            Development          No          No            No            No      Unknown
        [*]             Production          No         Yes            No            No      Unknown
        [*]            Development          No         Yes            No            No      ESRD
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]            Development          No          No           Yes            No      Unknown
        [*]              Dormant            No          No            No            No      Medical Network
        [*]                                 No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]             Specs Sent          No         Yes            No            No      Pharmaceutical Services
        [*]             Specs Sent          No         Yes            No            No      Unknown

</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                    VII.C-1-7
<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]              Dormant            No          No           Yes            No      Nursing Home
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]            Development          No          No           Yes            No      Physician Practice
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]                                 No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]           Section I Sent        No          No            No            No      Unknown
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No          No           Yes            No      Unknown
        [*]             Specs Sent          No          No           Yes            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      Physician Practice
        [*]             Production          No         Yes            No            No      ESRD
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Production          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]            Letter Sent          No         Yes            No            No      ESRD
        [*]             Production          No          No           Yes           Yes      Unknown
        [*]              Dormant            No         Yes            No            No      Unknown

</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                    VII.C-1-8
<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Production          No         Yes            No            No      Nursing Home
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]                Beta             No          No           Yes            No      Vendor Lab
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]            Development          No         Yes            No            No      Physician Practice
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]              Dormant            No          No           Yes            No      CLinic
        [*]            Development          No         Yes            No            No      Unknown
        [*]              Dormant            No          No           Yes            No      Unknown
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      Physician Practice
        [*]              Dormant            No         Yes            No            No      Unknown
        [*]             Specs Sent          No          No           Yes            No      Physician Practice
        [*]                                 No          No            No            No      Unknown
        [*]            Letter Sent          No         Yes            No            No      CLinic
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]              Dormant            No          No           Yes            No      Unknown
        [*]             Specs Sent          No         Yes            No            No      CLinic
        [*]                                 No          No           Yes            No      CLinic
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]              Dormant            No         Yes            No            No      CLinic
        [*]             Production          No         Yes            No            No      ESRD
        [*]             Specs Sent          No          No           Yes            No      CLinic
        [*]             Specs Sent          No         Yes            No            No      Unknown
        [*]             Production          No         Yes            No            No      Unknown
        [*]              Dormant            No         Yes            No            No      CLinic

</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                    VII.C-1-9
<PAGE>

                    EXISTING VENDOR INTERFACE RELATIONSHIPS
<TABLE>
<CAPTION>
                                          ORDERS     RESULTS      ORDERS AND
    VENDOR NAME           STATUS           ONLY        ONLY        RESULTS       BILLING               DESCRIPTION
   -------------   --------------------  --------   ---------   --------------  ---------   ----------------------------------
   <S>             <C>                   <C>        <C>         <C>             <C>         <C>
        [*]             Specs Sent          No          No           Yes            No      Unknown
        [*]              Dormant            No         Yes            No            No      Medical Network
        [*]             Specs Sent          No          No            No            No      Unknown
        [*]             Specs Sent          No          No           Yes            No      Physician Practice

</TABLE>

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                    VII.C-1-10
<PAGE>

                              AMENDMENT NO. 1 TO
                              SERVICES AGREEMENT


          This AMENDMENT NO. 1 TO SERVICES AGREEMENT ("Amendment No. 1") is 
made and entered into this 15th day of May, 1998 by and between ACTAMED 
CORPORATION, a Georgia Corporation ("ActaMed") and SMITHKLINE BEECHAM 
CLINICAL LABORATORIES, INC., a Delaware Corporation ("SBCL").

          WHEREAS, ActaMed and SBCL entered into a Services Agreement on
December 31, 1997 ("Services Agreement") and desire to amend same in connection
with the merger a subsidiary of Healtheon Corporation with and into ActaMed,
with the result that ActaMed will become a wholly-owned subsidiary of Healtheon.

          NOW THEREFORE, in consideration of the premises and the mutual
promises contained herein, the parties, intending to be legally bound, agree as
follows:

1    DEFINITIONS.

     Capitalized terms used in this Amendment No. 1 and not otherwise defined
herein have the meanings set forth in the Services Agreement.

2    AMENDMENTS.

     2.1    [*] REMOVED FROM [*].  Section IV.C is replaced in its entirety as 
follows:

                 "1.     An amount (the "FIRST VARIABLE FEE") equal to (i) [*]
     minus the aggregate of the amount billed to SBCL pursuant to Section 
     IV.B. above, excluding amounts attributable to any Provider office with 
     ProviderLink that is subsequently installed with the Scan Software or 
     ActaLab Software (the "FIRST TRANSACTION FEE AMOUNT") prior to the [*] 
     (ii) [*] minus the sum of (A) the First Transaction Fee Amount for the 
     period from the date hereof to the [*] and (B) the amount paid pursuant 
     to clause (i) above; and (iii) [*] minus the sum of (A) the First 
     Transaction Fee Amount for the period from the date hereof to the [*] and 
     (B) the amount paid pursuant to clauses (i) and (ii) above.
     
                 2.      An amount (the "SECOND VARIABLE FEE") equal to (i) 
     [*] minus the aggregate of the amount paid plus amounts owed (whether or 
     not billed) pursuant to Section IV.M.1 below (the 

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


<PAGE>

     "PIF AMOUNT") prior to the [*]; (ii) [*] minus the sum of (A) the PIF 
     Amount for the period from the date hereof to the [*] and (B) the amount 
     paid pursuant to clause (i) above; and (iii) [*] minus the sum of (A) the 
     PIF Amount for the period from the date hereof to the [*] and (B) the 
     amount paid pursuant to clauses (i) and (ii) above; PROVIDED THAT if the 
     PIF Amount with respect to an annual period (other than the last such 
     annual period) is at least [*] of the aforementioned dollar amount for 
     that annual period, no payment shall be due under this Section IV.C.2 for 
     such annual period.

                 3.      An amount (the "THIRD VARIABLE FEE" and together 
     with the First Variable Fee and Second Variable Fee, the "VARIABLE 
     FEES") equal to (i) [*] minus the aggregate of the amount billed to SBCL 
     attributable to any Provider office with ProviderLink that is 
     subsequently installed with the Scan Software or ActaLab Software (the 
     "THIRD TRANSACTION FEE AMOUNT") prior to the [*]; (ii) [*] minus the sum 
     of (A) the Third Transaction Fee Amount for the period from the date 
     hereof to the [*] and (B) the amount paid pursuant to clause (i) above; 
     and (iii) [*] minus the sum of (A) the Third Transaction Fee Amount for 
     the period from the date hereof to the [*] and (B) the amount paid pursuant
     to clauses (i) and (ii) above.
     
                 4.      Subject to Section IV.D, the Variable Fees shall be 
     paid annually within thirty (30) days after invoice therefor from 
     ActaMed or Healtheon, which shall be (i) submitted to SBCL within [*] 
     (ii) detail the calculation thereof, and (iii) reflect the Variable Fees 
     payable in respect of the most recently completed annual period only.  
     SBCL shall have Audit Rights with respect to any disputed amount of the 
     Variable Fees."

     2.2    CONDITIONS TO BUSINESS ASSURANCE PAYMENTS.  Section IV.D.1 is
hereby replaced in its entirety as follows:

            "1.  With respect to all Variable Fees, (i) such fees shall
     cease to be payable if ActaMed shall fail to satisfy any of the Key
     Performance Standards, or (ii) such fees (excluding the portion of the
     First Variable Fee attributable to Transaction Fees generated from PIF
     Sites) for the applicable year shall not be payable (but shall be
     treated as paid for purposes of calculation of any amount payable in
     the following year) if any of the following shall occur:
     
                 a.      As of [*] ActaMed shall fail to have at least [*] 
     ActaMed Sites;

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                     -2-
<PAGE>

                 b.      As of [*] ActaMed shall fail to have at least [*] 
     ActaMed Sites; and 

                 c.      As of [*] ActaMed shall fail to have at least [*] 
     ActaMed Sites.

     2.3    CONDITIONS TO BUSINESS ASSURANCE PAYMENTS.  Section IV.D is hereby
further amended by adding the following Subsection 3 at the end of such Section:

            "3.  With respect to the Third Variable Fee, such fees also
     shall not be payable (but shall be treated as paid for purposes of
     calculating any amount payable in the following year) if any of the
     following shall occur: 

                 a.      As of [*] ActaMed shall fail to have at least [*] 
     ActaMed Sites;
     
                 b.      As of [*] ActaMed shall fail to have at least [*] 
     ActaMed Sites; and 
     
                 c.      As of [*] ActaMed shall fail to have at least [*] 
     ActaMed Sites.
     
     2.4    [*] COSTS.  Section IV.J is amended to insert at the end thereof: 
"SBCL is not responsible for paying any [*] incurred by ActaMed or a Provider 
relating to the provision of Lab EDI Services, including without limitation, 
any [*], [*] and [*]."

     2.5    REMOVAL OF [*] HARDWARE PURCHASES.  Section IV.K.2.b is
replaced in its entirety as follows:

            "b.  In addition, ActaMed shall provide, prior to the [*] up to 
     [*] PC Systems for New Sites or Replacement Fixed Fee Sites in excess of 
     the [*] set forth in (a) above.  Notwithstanding the above, this 
     obligation shall be reduced by each PC System the cost of which is 
     reimbursed to SBCL subject to Section IV.K.1 above."

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                     -3-
<PAGE>

     2.6    EXCLUSIVE DEVELOPMENTS AMENDED.   Section V.E is replaced in its
entirety as follows:

            "E.  DEVELOPMENT WORK REQUESTED BY SBCL.
     
                 1.      SBCL may at any time request that ActaMed perform
     additional development work.  Subject to the terms of this Section
     V.E, SBCL shall pay ActaMed for development services the work product
     from which constitutes an Exclusive Development at no higher than the
     then industry standard rates for similar services.
     
                         a.   SBCL shall be entitled to request in writing 
     that ActaMed perform development services the resulting work from which 
     shall be for the exclusive benefit of SBCL (an "EXCLUSIVE DEVELOPMENT"); 
     provided that, except as provided in Section V.E.1.b, SBCL shall not be 
     entitled to more than [*] Exclusive Development [*].  If ActaMed, before 
     9:00 AM (EST) of the [*] after the date on which such request is 
     received by ActaMed, delivers to SBCL [*] then, notwithstanding that 
     SBCL's request specified that the work would be an Exclusive Development, 
     the work so requested by SBCL shall be a "COMMON DEVELOPMENT."  Under no 
     circumstances shall any SBCL requested development work that is required 
     for purposes of complying with Applicable Laws, Regulations or any 
     Regulatory Change constitute an Exclusive Development.  Any SBCL 
     requested work that is (i) classified as a Common Development in 
     accordance with this Section V.E.1.a, or (ii) required to comply with 
     Applicable Laws, Regulations or any Regulatory Change, shall not be 
     counted for purposes of applying the limit on Exclusive Developments 
     under this Section V.E.1.a.
     
                         b.   SBCL may request in writing that ActaMed
     provide additional development work at any time.  Such work shall
     result in either a Common Development or Exclusive Development
     pursuant to price and terms agreed to by the parties in accordance
     with Section V.E.1.e below.  Any work classified as an Exclusive
     Development in accordance with this Section V.E.1.b shall not be
     counted for purposes of applying the limit on Exclusive Developments
     under this Section V.E.1.a.
     
                         c.   ActaMed will not use or license the use of
     any Exclusive Development (without regard to whether it constitutes a
     SCAN Development or ActaLab Software) other than in support of Lab EDI
     Services.  Subject to the ownership and license rights under the
     License Agreement, both 

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                     -4-
<PAGE>

     ActaMed and SBCL shall be entitled to make any use of a Common 
     Development.  The terms of the foregoing two sentences shall survive 
     termination of this Agreement for any reason.  ActaMed may charge SBCL 
     [*] the work product from which constitutes a Common Development.  Any 
     such charge shall be [*] and shall be separately stated on invoices sent 
     to SBCL.

                         d.   For purposes of this Section V.E, Exclusive
     Developments shall include any Changes made pursuant to Section V.C
     and paid for by SBCL by reason of Section V.C.4, to be designated as
     Exclusive Developments in accordance with the procedures set forth in
     this Section V.E.1.
     
                         e.   Within [*] days after receiving SBCL's request 
     pursuant to Sections V.E.1.a or V.E.1.b, ActaMed shall notify SBCL of 
     ActaMed's prices and terms (including estimated completion date) for 
     performing such development work, which prices and terms SBCL shall not 
     unreasonably reject.  Within twenty (20) days after receiving ActaMed's 
     notice, SBCL shall accept or reject ActaMed's prices and terms for 
     performing the development work.  If SBCL provides notice accepting (i) 
     in respect of requests under Section V.E.1.a, ActaMed's prices and 
     terms, or (ii) in respect of requests under Section V.E.1.b (A) 
     ActaMed's prices and terms, and (B) ActaMed's designation of the work as 
     an Exclusive Development or Common Development, then ActaMed shall 
     perform such work (or cause such work to be performed) on the accepted 
     terms, and shall integrate the developed work into the ActaLab Software 
     or SCAN Developments, as applicable, and offer it as an additional 
     feature or function of Lab EDI Services, as soon as is reasonably 
     practicable.
     
     If SBCL provides notice that it does not accept ActaMed's prices and 
     terms, SBCL and ActaMed shall negotiate in good faith an alternative
     arrangement to the mutual satisfaction of the parties.  If within [*] 
     SBCL and ActaMed cannot reasonably agree upon such an alternative 
     arrangement,  then SBCL may engage a third party to perform the 
     development services for such work, subject to Section V.E.1.f.  Work 
     performed by such a third party shall be (i) an Exclusive Development 
     without regard to the frequency limitation of Section V.E.1.a, subject 
     to Section V.E.1.f below, (ii) integrated by ActaMed into the ActaLab 
     Software or SCAN Developments, as applicable, as soon as is reasonably 
     practicable, and (iii) offered by ActaMed as an additional feature or 
     function of Lab EDI Services, as soon as is reasonably practicable.  
     
     SBCL and ActaMed shall cooperate in developing acceptance standards
     and processes (the "ACCEPTANCE PROCESS") pursuant to which work
     prepared by a third party, in accordance with industry standard
     practices, shall be (i) reviewed, tested and modified, as necessary,
     to conform with ActaMed's professional standards, 

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                     -5-
<PAGE>

     the Performance Standards and ActaMed's compliance obligations under 
     Article VI, (ii) integrated into the ActaLab Software or SCAN 
     Developments, as applicable, and (iii) offered by ActaMed as an 
     additional feature or function of Lab EDI Services; provided, SBCL 
     shall reimburse ActaMed (at no higher than the then industry standard 
     rates for similar services) for any costs or expenses incurred by 
     ActaMed in any such testing, integration and offering of an additional 
     feature or function of Lab EDI Services under this Section V.E.1.e.

                         f.   Any contract between ActaMed and SBCL (or a
     third party developer and SBCL) for development of an Exclusive
     Development shall allocate ownership of and other rights with respect
     to the Exclusive Development, as between ActaMed and SBCL, in the
     manner contemplated by the License Agreement and Development
     Agreement, including, without limitation, Sections 2.1.4 and 2.3.2 of
     the License Agreement.

                 2.      If, at any time, SBCL chooses to contract with
     ActaMed for a dedicated services team from ActaMed to handle
     development of Changes to the Network, the Licensed Materials, or
     SBCL's proprietary systems which are not required to be performed by
     ActaMed pursuant to Section V.C and which are not requested pursuant
     to Section V.E, ActaMed may elect whether to provide the dedicated
     team and, if it so elects, shall do so only on terms and conditions
     agreed to in advance by SBCL."

     2.7    EXCLUSIVITY PERIOD.  Section XIII.C.2 is hereby replaced in its
entirety as follows:

            2.   At any time prior to [*] ActaMed shall not provide services 
     to any Other Lab at the SBCL Sites transferred to ActaMed pursuant to 
     the Purchase Agreement, including without limitation, to install or be 
     instrumental in [*] located at such sites which [*] for services [*] or 
     otherwise provide [*].  A full calendar month shall be added to the date 
     set forth in the preceding sentence for each month after [*] in which 
     ActaMed, determined as of the first day of each succeeding month, has 
     failed to complete the development of a fully functional ActaLab 
     Software (as described in the Development Agreement) and deploy a fully 
     tested, accepted and operating version of such software at one or more 
     ActaMed Sites.

3    MISCELLANEOUS.

     3.1    ENTIRE AGREEMENT.  This Amendment No. 1 constitutes the entire
understanding between the parties with respect to amendment to the Services
Agreement and supersedes all proposals, communications and agreements between
the parties relating to such subject matter. 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                     -6-
<PAGE>

No amendment, change, or waiver of any provision of this Amendment No. 1 will 
be binding unless in writing and signed by both parties.

     3.2    GOVERNING LAW.  This Amendment No. 1 will be governed by and
construed in accordance with the laws of the State of Georgia applicable to
contracts made and performed therein.

     3.3    SERVICES AGREEMENT PROVISIONS.  All provisions of the Services
Agreement not modified by this Amendment No. 1 shall remain in full force and
effect.  Subsections D, E and F of Section XVI of the Services Agreement shall
apply to this Amendment No. 1 as if fully set forth herein.

     3.4    COUNTERPARTS.  This Amendment No. 1 may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.





                        [INTENTIONALLY LEFT BLANK]





                                     -7-
<PAGE>

            IN WITNESS WHEREOF, the parties have executed this Amendment No. 1
to the Services Agreement as of the date set forth above.


                                     ACTAMED CORPORATION

                                     By:     /s/
                                        ---------------------------------------
                                     Its:    President & CEO
                                         --------------------------------------

                                     SMITHKLINE BEECHAM CLINICAL LABORATORIES,
                                     INC.

                                     By:     /s/
                                        ---------------------------------------

                                     Its:    President
                                         --------------------------------------






                                     -8-



<PAGE>

               CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED 
          AND FILED SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT 
               HAS BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

                             ASSETS PURCHASE AGREEMENT 
                                          
                                      between
                                          
                  SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC.  
                                          
                                        and 
                                          
                                ACTAMED CORPORATION
                                          
                                          
                                       DATED
                                          
                                 DECEMBER 31, 1997
                                          
                                          
<PAGE>
                                          
                                 TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                 PAGE
                                                                                 ----
<S>                                                                              <C>
ARTICLE 1 PURCHASE AND SALE ........................................................2

    Section 1.1     Agreement to Sell ..............................................2
    Section 1.2     Other Software .................................................2
    Section 1.3     Excluded Assets ................................................3
    Section 1.4     Agreement to Purchase ..........................................3
    Section 1.5     The Purchase Price .............................................3
    Section 1.6     Series D Price .................................................4
    Section 1.7     Purchase Price Adjustment ......................................5
    Section 1.8     Number of Sites Adjustment .....................................5

ARTICLE 2 CLOSINGS .................................................................6

    Section 2.1     Initial Closing ................................................6
    Section 2.2     Staging of the Transactions ....................................6
    Section 2.3     Regions to be Transferred ......................................7
    Section 2.4     Procedures Applicable if Transfer Benchmarks Are Not Met .......8
    Section 2.5     Deliveries by SBCL at Each of the Transfer Dates ...............9
    Section 2.6     Deliveries by ActaMed at Each of the Transfer Dates ............9
    Section 2.7     Prorations ....................................................10
    Section 2.8     Non-Transferable Assets .......................................10

ARTICLE 3 REPRESENTATIONS AND WARRANTIES ..........................................11

    Section 3.1     By SBCL .......................................................11
    Section 3.2     By ActaMed ....................................................16

ARTICLE 4 TRANSITION MATTERS ......................................................26

    Section 4.1     Prior to Region Transfer ......................................26
    Section 4.2     Region Transition Matters .....................................26
    Section 4.3     General Covenants .............................................27
    Section 4.4     Confidentiality of Trade Secrets ..............................29
    Section 4.5     Efforts to Satisfy Conditions .................................30
    Section 4.6     Expenses ......................................................31
    Section 4.7     Antitrust Notification ........................................31

ARTICLE 5 ACTAMED COVENANTS TO SBCL ...............................................31

    Section 5.1     Additional Covenants Of ActaMed ...............................31
    Section 5.2     Informational Covenants Of ActaMed ............................35


                                            -i-

<PAGE>

ARTICLE 6 EMPLOYEE MATTERS ........................................................38

    Section 6.1     Termination of Employment by SBCL and 
                      Offer of Employment by ActaMed ..............................38
    Section 6.2     Transitional Employee Leasing Arrangement .....................38
    Section 6.3     ActaMed Compensation and Benefits .............................39
    Section 6.4     Past Service Credit ...........................................39
    Section 6.5     Termination of Employment; Nonsolicitation; Termination 
                      of Agreement ................................................39
    Section 6.6     Payment of Wage and Benefit Costs .............................39
    Section 6.7     Taxes, Unemployment Insurance and Related Items ...............40
    Section 6.8     Examination and Audit .........................................41

ARTICLE 7 CONDITIONS PRECEDENT TO OBLIGATIONS OF ACTAMED ..........................41

    Section 7.1     Conditions Precedent To Obligations Of ActaMed ................41
    Section 7.2     Conditions Precedent To The Obligations Of SBCL ...............42

ARTICLE 8 SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS ...................43

    Section 8.1     Survival Of Representations, Warranties and Covenants .........43
    Section 8.2     Obligation to Indemnify .......................................44

ARTICLE 9 DISPUTE RESOLUTION ......................................................49

    Section 9.1     Informal Dispute Resolution ...................................49
    Section 9.2     Arbitration ...................................................50
    Section 9.3     Litigation ....................................................51

ARTICLE 10 TERMINATION ............................................................51

    Section 10.1    Termination ...................................................51
    Section 10.2    Risk of Loss ..................................................52

ARTICLE 11 MISCELLANEOUS ..........................................................53

    Section 11.1    General Provisions ............................................53

</TABLE>


                                        -ii-

<PAGE>

                          CONFIDENTIAL TREATMENT REQUESTED

                             ASSETS PURCHASE AGREEMENT

     This Assets Purchase Agreement (this "ASSETS PURCHASE AGREEMENT" or
"AGREEMENT"),  dated as of December 31, 1997, is an agreement by and between
SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC., a corporation organized and
existing under the laws of Delaware ("SBCL") and ACTAMED CORPORATION, a
corporation organized and existing under the laws of Georgia ("ACTAMED"). 
Capitalized terms used in this Assets Purchase Agreement and not otherwise
defined herein are defined in EXHIBIT A attached to this Assets Purchase
Agreement.
                                          
                                    PREAMBLE

     ActaMed is in the business of providing electronic data interchange
products and services to the health care industry, including its ProviderLink
software, and desires to develop business involving automated laboratory order
entry and results reporting services.

     SBCL provides laboratory testing services to certain Providers who use SBCL
Software  for electronic clinical laboratory test order entry and/or test result
reporting between an  SBCL Lab and such Provider.  In addition, SBCL uses the
SBCL Software to allow certain [*] to send laboratory test orders entered
electronically to an SBCL Lab and/or to have the test results reported
electronically back to [*] or the Provider ordering the test.

          The Parties previously entered into a Development Agreement dated
October 31, 1997 pursuant to which ActaMed and SBCL are jointly developing the
ActaLab Software.

          ActaMed desires to purchase and SBCL desires to sell certain assets
associated with SBCL's provision of Lab EDI Services, as more fully set forth
herein.  Concurrently with the execution and delivery of this Purchase
Agreement, SBCL and ActaMed are entering into (i) a License Agreement whereby,
among other things, SBCL grants ActaMed an irrevocable non-exclusive license to
the SBCL Software (as defined therein); and (ii) a Services Agreement whereby
ActaMed agrees, among other things, to provide Lab EDI Services to Automated
Providers and SBCL agrees to pay certain compensation to ActaMed in connection
therewith.  This Assets Purchase Agreement states the parties' agreements
relating to the purchase and sale of the SCAN Assets and certain transition
matters.

          The Parties contemplate that there will be a staged transfer to
ActaMed of the SCAN Assets.  The transfer of Region One SCAN Assets is to occur
on the Region One Transfer Date.  The transfer of the other Regions will occur
sequentially when the Transfer Benchmarks for transfer of such Regions have been
met.
                                          
                                     AGREEMENT

          In consideration of the recitals and of the respective covenants,
representations, warranties and agreements herein contained, and intending to be
legally bound hereby, the parties hereto hereby agree as follows:

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

<PAGE>

                                   ARTICLE 1 

                               PURCHASE AND SALE

     SECTION 1.1    AGREEMENT TO SELL.  SBCL hereby agrees to sell, convey,
assign, transfer and deliver to ActaMed, upon and subject to the terms and
conditions of this Assets Purchase Agreement, all right, title and interest of
SBCL in and to the following assets located in Region One, and, subject in
addition to fulfillment of the conditions precedent set forth in Section 2.3,
the following assets in Regions Two, Three, and Four, in every case free and
clear of all Liens: 

                    1.1.1     The personal computers, modems, bar code 
readers, bar code label printers, requisition and results printers and other 
peripherals (not including [*]) and spare parts owned by SBCL and provided by 
SBCL to Automated Providers for Lab EDI Services (or which comprised all or 
part of such items located at an SBCL Site before the Applicable Transfer 
Date, but not located at an SBCL Site on the Applicable Transfer Date), 
including all documentation supplied to Automated Providers for purposes of 
utilizing SBCL Software;

                    1.1.2     SBCL's contractual right to use the telephone
lines that are installed at an SBCL Site and are used by SBCL in providing Lab
EDI Services to the extent assignable and assumed by ActaMed;

                    1.1.3     The letter agreements, as amended, between SBCL
and Automated Providers relating to Automated Providers' use of SBCL's Lab EDI
Services; 

                    1.1.4     The vendor contracts between SBCL and various
vendors who provide products or services to Automated Providers in connection
with SBCL's provision of Lab EDI Services to SBCL Sites to the extent assignable
and assumed by ActaMed;

                    1.1.5     All personal computers, peripherals, spare parts
and other fixed assets not located at an SBCL Site on the Applicable Transfer
Date, but used solely by the Transferred Employees and exclusively in connection
with SBCL's provision of software development, field or remote support for SBCL
Sites; and

                    1.1.6     SBCL's rights to the ActaLab Software.

     SECTION 1.2    OTHER SOFTWARE.

                    1.2.1     In conjunction with the sale of each PC System and
each personal computer described in Section 1.1.5 (an "Employee Computer") to
ActaMed in accordance herewith, SBCL shall assign to ActaMed all of SBCL's
rights in the copies of Third Party Software (excluding any office software used
by the Employees, including without limitation, cc:mail) that, as of the
Applicable Transfer Date, are (i) installed by, or in accordance with the

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                -2-
<PAGE>


instructions of, SBCL and (ii) is resident on such PC System or Employee
Computer, which rights shall be sufficient to permit ActaMed to:

                              (a)  continue using such copy of the Third Party
Software on the applicable PC System or Employee Computer,

                              (b)  move such copy to a replacement computer so
long as the copy is deleted from the PC System or Employee Computer on which it
resides on the Applicable Transfer Date or subsequent transferee computer
system, and

                              (c)  assign ActaMed's rights in such copy to a
purchaser of the applicable components of the  PC System (but not to a purchaser
of any Employee Computer) on which it resides at the Applicable Transfer Date,
or replacement computer with respect to any PC System; 

PROVIDED, that (A) ActaMed agrees to comply with any applicable terms and
conditions imposed by the supplier of such Third Party Software, (B) except as
expressly set forth herein, nothing in this Section 1.2 shall be construed as
assigning to ActaMed, or granting to ActaMed, any rights under any agreements
between SBCL and the vendors of such Third Party Software, and (C) nothing in
this Agreement shall be construed as conveying to ActaMed or any other party any
software installed on any PC System or Employee Computer other than by SBCL or
pursuant to SBCL's instructions.

                    1.2.2     SBCL shall transfer to ActaMed, proportionately 
with the number of SBCL Sites transferred to ActaMed from time to time in 
accordance with this Agreement, all of SBCL's rights in, including the 
single-site licenses for, any copy of Microsoft Windows which was resident on 
a PC System when it was delivered to SBCL by the manufacturer or other 
supplier for installation at an SBCL Site, and subsequently removed by SBCL.  
SBCL shall deliver the licenses to ActaMed.

     SECTION 1.3    EXCLUDED ASSETS.  The SCAN Assets shall not include
computers, modems, bar code readers, bar code label printers, requisition and
results printers and other peripherals and fixed assets acquired by SBCL for use
in providing Lab EDI Services, but which have never been so used.

     SECTION 1.4    AGREEMENT TO PURCHASE.  ActaMed hereby agrees to purchase
the SCAN Assets from SBCL, upon and subject to the terms and conditions of this
Assets Purchase Agreement and in reliance on the representations, warranties and
covenants of SBCL contained herein, for the Purchase Price and the execution and
delivery of the Assumption Agreement.  ActaMed shall not assume or be
responsible for any liabilities or obligations of SBCL other than the
Liabilities assumed by virtue of the Assumption Agreement.

     SECTION 1.5    THE PURCHASE PRICE.  Subject to any adjustment pursuant to
Sections 1.7 or 1.8 hereof, the purchase price for the SCAN Assets and the
rights granted to ActaMed 


                                   -3-
<PAGE>


pursuant to the License Agreement shall be [*].  The Purchase Price shall be 
allocated among the SCAN Assets in the different Regions and the License 
granted pursuant to the License Agreement as set forth in Schedule 1.5 hereto 
(the "Purchase Price").  The Purchase Price shall be payable as follows:

                    1.5.1     on the Region One Transfer Date, in 
consideration for the grant of rights pursuant to the License Agreement, 
ActaMed will pay or issue to SBCL (A) [*] by wire transfer of immediately 
available funds to an account designated by SBCL prior to the Region One 
Transfer Date, and (B) [*] shares of ActaMed's Series D Preferred Stock;

                    1.5.2     on the Region One Transfer Date, in consideration
of the transfer to ActaMed of the SCAN Assets located in Region One, ActaMed
will issue to SBCL [*] shares of ActaMed's Series D Preferred Stock; 

                    1.5.3     on the Region Two Transfer Date, in further 
consideration of the grant to ActaMed of rights under the License Agreement, 
and in consideration of the transfer to ActaMed of the SCAN Assets located in 
Region Two, ActaMed will issue to SBCL the  number of shares of ActaMed's 
Series D Preferred Stock determined by dividing [*] plus [*] respectively, 
by the Series D Price on such date;

                    1.5.4     on the Region Three Transfer Date, in further 
consideration of the grant to ActaMed of rights under the License Agreement, 
and in consideration of the transfer to ActaMed of the SCAN Assets located in 
Region Three, ActaMed will issue to SBCL the  number of shares of ActaMed's 
Series D Preferred Stock determined by dividing [*] plus [*] respectively, 
by the Series D Price on such date; and

                    1.5.5     on the Region Four Transfer Date, in further 
consideration of the grant to ActaMed of rights under the License Agreement, 
and in consideration of the transfer to ActaMed of the SCAN Assets located in 
Region Four, ActaMed will issue to SBCL the  number of shares of ActaMed's 
Series D Preferred Stock determined by dividing [*] plus [*] respectively, 
by the Series D Price on such date.

     SECTION 1.6    SERIES D PRICE.  For purposes hereof, the "Series D Price"
shall mean:

                    1.6.1     prior to ActaMed's initial Public Offering:

                              (a)  [*] on the Region One Transfer Date and 
the Region Two Transfer Date, [*] on the Region Three Transfer Date, and [*] 
on the Region Four Transfer Date, subject to the provisions of subparagraphs 
(b) and (c) below;

                              (b)  if prior to any Transfer Date after the
Region One Transfer Date,  ActaMed issues Qualified Preferred Stock, the Series
D Price on such Transfer Date shall be the Per Share Issue Price of such
Qualified Preferred Stock, and the Series D Price shall 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                    -4-
<PAGE>


thereafter remain constant for all subsequent Transfer Dates unless adjusted 
(i) in accordance with this provision, upon a subsequent issuance of 
Qualified Preferred Stock or (ii) in accordance with subparagraph (c) below; 
or

                              (c)  notwithstanding anything to the contrary in
this Section 1.6.1, if, on any Applicable Transfer Date, ActaMed has achieved
less than [*] of the revenues for the cumulative months or
quarters (as may be applicable based on the detail required for the New Business
Plan) prior to such Applicable Transfer Date as set forth in the New Business
Plan, then the Series D Price shall revert to [*] and

                    1.6.2     after ActaMed's initial Public Offering, if a
Transfer Date occurs at least thirty (30) trading days after the effective date
of such Public Offering, the average for such 30 days of (i) the mean between
the reported high and low sales prices for ActaMed Common Stock on each such
trading day, or (ii) if no sales are reported on any such trading day, the mean
between the bid and offered prices for ActaMed Common Stock on such trading day;
or, if the Transfer Date occurs prior to the 30th day following such initial
Public Offering (including the initial day of trading when computing the number
of days), the initial offering price for ActaMed Common Stock in such initial
Public Offering less the amount of any underwriters' discounts or commissions on
a per share basis, as set forth in the effective registration statement.

                    1.6.3     For purposes of Section 1.6, "Qualified Preferred
Stock" shall mean shares of ActaMed's preferred stock issued in an arm's length
transaction to one or more purchasers who are not ActaMed stockholders as of the
Region One Transfer Date for an aggregate purchase price of not less than
$7,000,000; and the "Per Share Issue Price" of such Qualified Preferred Stock
shall be the consideration per equivalent share of Common Stock received by
ActaMed for the Qualified Preferred Stock, adjusted backwards to the Region One
Transfer Date for any subdivision or combination of shares of ActaMed capital
stock or similar change in ActaMed's capital structure (whether by stock split,
stock dividend, merger, share exchange, consolidation or otherwise) since the
Region One Transfer Date.

     SECTION 1.7    PURCHASE PRICE ADJUSTMENT.  SBCL shall transfer all of 
the SCAN Assets located in Region Three on the Region Three Transfer Date.  
In the event that, by [*] SBCL has not provided [*] to ActaMed [*] described 
in [*] of the Services Agreement, [*] to [*] by [*].  In such case, if, 
subsequent to [*] SBCL provides [*] ActaMed shall [*] that SBCL [*] 
pursuant to this provision [*].

     SECTION 1.8    NUMBER OF SITES ADJUSTMENT.  On any Transfer Date other 
than the Region One Transfer Date, if the aggregate number of SBCL Sites 
located in the Regions which were previously transferred to ActaMed in 
accordance herewith, plus the aggregate number of SBCL Sites located in 
Regions then being or subsequently to be transferred to ActaMed, is less than 
[*] then the portion of the Purchase Price 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                   -5-
<PAGE>


otherwise payable on such Transfer Date shall be reduced to an amount equal 
to the portion of the Purchase Price otherwise then payable times a fraction 
the numerator of which shall be the number of SBCL Sites to be transferred on 
such Transfer Date, and the denominator of which shall be [*] MINUS the 
number of SBCL Sites transferred on previous Transfer Dates, and MINUS the 
number of SBCL Sites located in Regions subsequently to be transferred; 
PROVIDED that no such adjustment shall be made if such fraction is [*] or 
more.

                               ARTICLE 2   

                               CLOSINGS

     SECTION 2.1    INITIAL CLOSING.  Conveyance of SCAN Assets in each of the
Regions by SBCL to ActaMed shall take place as set forth in this Article Two. 
Concurrently with the execution and delivery of this Assets Purchase Agreement,
SBCL and ActaMed have executed and delivered the License Agreement, the First
Amendment to the Development Agreement, the Services Agreement, the Third
Amendment to the Stockholders Agreement, the Third Amendment to the Registration
Rights Agreement, the Standstill Agreement, and such other documents as the
parties have reasonably requested, each of which shall be effective as of the
Region One Transfer Date.  In addition, effective on or before such date,
ActaMed shall file in the office of the Secretary of State of Georgia its Fourth
Amended Articles.

     SECTION 2.2    STAGING OF THE TRANSACTIONS.

                    2.2.1     The parties shall effect the transfer of the SCAN
Assets in as orderly a manner as possible and with minimal disruption to
Automated Providers.  This Assets Purchase Agreement provides benchmarks that
will be used by the parties to measure the degree to which the transfer is
orderly and without disruption and provides steps the parties will take if the
benchmarks are not met to improve the transition process.  Provided the
benchmarks are satisfied, the parties intend that all of the transfers be
completed as quickly as possible and that targeted transfer dates may be
accelerated in such circumstances.

                    2.2.2     At any time, upon not less than fifteen (15) days
written notice by SBCL to ActaMed, except to the extent a shorter period is
provided for in Section 2.2.3 hereof, SBCL shall in its sole discretion have the
right to accelerate the Region Two Transfer Date, the Region Three Transfer Date
or the Region Four Transfer Date to a date immediately after expiration of such
notice period (the "ACCELERATED TRANSFER DATE").  In such case, the transactions
contemplated by Sections 1.5.3, 1.5.4 and 1.5.5 above shall take place on such
Accelerated Transfer Date, in the manner specified in Sections 2.5 and 2.6
below, subject to the other terms and conditions of this Assets Purchase
Agreement.

                    2.2.3     In the event of any proposed issuance of Qualified
Preferred Stock, ActaMed shall provide SBCL with notice of its intent to
consummate such a transaction not less 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                     -6-
<PAGE>


than forty-five (45) days prior to doing so, and shall provide SBCL notice of 
an affirmative obligation to issue Qualified Preferred Stock not less than 
fifteen (15) days prior to issuance.  In such event, SBCL shall in its sole 
discretion have the right to notify ActaMed and cause one or more Accelerated 
Transfer Dates to occur thirty (30) days after the giving of such notice, 
and, if SBCL so designates, conditioned upon the occurrence of the proposed 
sale of Qualified Preferred Stock.  The number of shares Series D Preferred 
Stock issued to SBCL on any such Accelerated Transfer Date(s) shall be 
calculated as if such Accelerated Transfer Date(s) occurred prior to the 
closing of the sale of such Qualified Preferred Stock.

     SECTION 2.3    REGIONS TO BE TRANSFERRED.

                    2.3.1     The SCAN Assets located in Region One will be
transferred to ActaMed on the Region One Transfer Date.  The parties will
cooperate to identify and resolve any problems that arise after the transfer of
such SCAN Assets to ActaMed.

                    2.3.2     Provided that the applicable Transfer Benchmarks
have been met for Region One Sites, and subject to SBCL's rights under Section
2.2.2 hereof, the SCAN Assets located in Region Two will be transferred to
ActaMed three (3) months after the Region One Transfer Date (the "REGION TWO
TRANSFER DATE").  ActaMed shall notify SBCL's Relationship Manager that it is in
compliance with the Transfer Benchmarks and wishes to close the transfer of the
SCAN Assets located in Region Two fifteen (15) days prior to the scheduled
Region Two Transfer Date.  SBCL shall have seven (7) days to respond to
ActaMed's notice, indicating that SBCL either (i) will close the transfer on the
scheduled Region Two Transfer Date or (ii) that ActaMed's operations relative to
the Region One Sites fail to meet the Transfer Benchmarks.  If SBCL determines
that ActaMed's operations relative to the Region One Sites fail to meet the
Transfer Benchmarks to allow for the transfer of SCAN Assets located in Region
Two, the provisions of Section 2.4 will apply.  The parties will cooperate to
identify and resolve any problems that arise after the transfer of the SCAN
Assets located at Region Two Sites to ActaMed.

                    2.3.3     Provided that the applicable Transfer Benchmarks
have been met for Region One Sites and Region Two Sites on and after the Region
Two Transfer Date, and subject to SBCL's rights under Section 2.2.2 hereof, the
SCAN Assets located in Region Three will be transferred to ActaMed three (3)
months after the Region Two Transfer Date (the "REGION THREE TRANSFER DATE"). 
ActaMed shall notify SBCL's Relationship Manager that it is in compliance with
the Transfer Benchmarks and wishes to close the transfer of the SCAN Assets
located in Region Three fifteen (15) days prior to the scheduled Region Three
Transfer Date.  SBCL shall have seven (7) days to respond to ActaMed's notice,
indicating that SBCL either (i) will close the transfer on the scheduled Region
Three Transfer Date or (ii) that ActaMed's operations relative to the Region One
Sites and Region Two Sites fail to meet the Transfer Benchmarks.  If SBCL
determines that ActaMed's operations relative to the Region One Sites and Region
Two Sites fail to meet the Transfer Benchmarks to allow for the transfer of SCAN
Assets located in Region Three, the provisions of Section 2.4 will apply.  The
parties will 


                                       -7-
<PAGE>

cooperate to identify and resolve any problems that arise after the transfer 
of the SCAN Assets located at Region Three Sites to ActaMed.

                    2.3.4     Provided that the applicable Transfer Benchmarks
have been met for Region One Sites, Region Two Sites and Region Three Sites on
and after the Region Three Transfer Date, and subject to SBCL's rights under
Section 2.2.2 hereof, the SCAN Assets located in Region Four will be transferred
to ActaMed three (3) months after the Region Three Transfer Date (the "REGION
FOUR TRANSFER DATE").  ActaMed shall notify SBCL's Relationship Manager  that it
is in compliance with the Transfer Benchmarks and wishes to close the transfer
of the SCAN Assets located in Region Four fifteen (15) days prior to the
scheduled Region Four Transfer Date.  SBCL shall have seven (7) days to respond
to ActaMed's notice, indicating that SBCL either (i) will close the transfer on
the scheduled Region Four Transfer Date or (ii) that ActaMed's operations
relative to the Region One Sites, Region Two Sites and Region Three Sites fail
to meet the Transfer Benchmarks.  If SBCL determines that ActaMed's operations
relative to the Region One Sites, Region Two Sites and Region Three Sites fail
to meet the Transfer Benchmarks to allow for the transfer of SCAN Assets located
in Region Four, the provisions of Section 2.4 will apply. The parties will
cooperate to identify and resolve any problems that arise after the transfer of
the SCAN Assets located at Region Four Sites to ActaMed.

     SECTION 2.4    PROCEDURES APPLICABLE IF TRANSFER BENCHMARKS ARE NOT MET. 
If, prior to any scheduled Transfer Date after the Region One Transfer Date,
SBCL determines that ActaMed has failed to meet the requisite Transfer
Benchmarks, ActaMed shall, on or prior to five (5) business days following the
scheduled Transfer Date, either (i) submit a written remediation plan to SBCL
detailing the steps required to accomplish such Transfer Benchmarks and the
means to achieving  such steps, or (ii) notify SBCL, in writing, that ActaMed
believes the failure to meet such Transfer Benchmarks is for reasons beyond the
control of ActaMed, including without limitation, a failure by SBCL to perform
in accordance with the terms and conditions of the Services Agreement.  Within
ten (10) business days following receipt of such a remediation plan or notice,
SBCL shall make a determination, considering available resources and the
contents of the plan or notice, as to whether the problem is remediable within a
reasonable period of time.  If SBCL determines that the problem is remediable as
aforesaid, it shall set a date not less than thirty (30) nor more than ninety
(90) days from the scheduled Transfer Date as a measurement date (the
"Measurement Date") for satisfaction of the applicable Transfer Benchmarks.  If
SBCL determines that the applicable Transfer Benchmarks are met on or before the
Measurement Date, then the original Transfer Date shall be reset for a date
immediately following the date which is ten (10) days after such applicable
Transfer Benchmarks were met, and on which date such applicable Transfer
Benchmarks continue to be met.  If ActaMed disagrees with SBCL's determination
as to whether the problem is remediable, the dispute shall be resolved pursuant
to the provisions of Article IX hereof.  If a Transfer Date is extended or reset
hereunder, all subsequent Transfer Dates will be rescheduled, subject to this
Section 2.4, at three (3) month intervals after the extended or reset Transfer
Date.


                                    -8-

<PAGE>

     SECTION 2.5    DELIVERIES BY SBCL AT EACH OF THE TRANSFER DATES.  At each
of the Transfer Dates, SBCL shall execute and deliver to ActaMed the following
documents to the extent relating to the SCAN Assets in the Region being
transferred:

                    2.5.1     a Bill of Sale and Assignment (in the form
attached as EXHIBIT 2.5.1) covering the SCAN Assets for the Region being
transferred;

                    2.5.2     an SBCL Compliance Certificate (in the form
attached as EXHIBIT 2.5.2) pursuant to which SBCL will make the representations
and warranties as to itself and the SCAN Assets in the Region being transferred
contained in Section 3.1 hereof (other than the representations and warranties
contained in Sections 3.1.3, 3.1.4(a)-(e), 3.1.6(d) and 3.1.7(b), which shall be
made only on the Region One Transfer Date), which certificate shall attach
revised Disclosure Schedules to the extent necessary to make the representations
and warranties made on such Transfer Date (with the exceptions noted above) true
and correct in all material respects; PROVIDED that to the extent that any such
representation and warranty is dependent upon information provided by
Transferred Employee or other people employed by ActaMed, such representations
and warranties shall be given only to the best of SBCL's knowledge;

                    2.5.3     an SBCL Secretary's Certificate (in the form
attached as EXHIBIT 2.5.3);

                    2.5.4     any other consents or waivers obtained pursuant to
Section 7.1.5 covering the Region transferred, including consents to the
assignment and assumption of each of the Vendor Contracts applicable to the SCAN
Assets in the Region that ActaMed is assuming;

                    2.5.5     all of the books and records, including but not
limited to, books of account, leases, contracts, and customer lists, of SBCL
relating exclusively to the SCAN Assets for the Region transferred; and

                    2.5.6     such other documents or certificates as may be
reasonably requested by ActaMed.

     SECTION 2.6    DELIVERIES BY ACTAMED AT EACH OF THE TRANSFER DATES.  At
each of the Transfer Dates, ActaMed shall execute and deliver to SBCL the
following documents to the extent relating to the Region being transferred:

                    2.6.1     the applicable number of shares of Series D
Preferred Stock, as determined in accordance with Sections 1.5, 1.6 and 1.8 of
this Assets Purchase Agreement;

                    2.6.2     an Assumption Agreement (in the form attached
hereto as EXHIBIT 2.6.2) covering, for the Region transferred, (i) the Vendor
Contracts for the Region transferred, (ii) the Phone Lines and (iii) the
Provider Agreements for the Region transferred;


                                    -9-
<PAGE>

                    2.6.3     an ActaMed Compliance Certificate (in the form
attached hereto as EXHIBIT 2.6.3), pursuant to which ActaMed will make the
representations and warranties contained in Section 3.2 hereof, which
certificate shall attach revised Disclosure Schedules to the extent necessary to
make the representations and warranties made on such Transfer Date true and
correct in all material respects;

                    2.6.4     an ActaMed Secretary's Certificate (in the form
attached hereto as EXHIBIT 2.6.4); and

                    2.6.5     such other documents or certificates as may be
reasonably requested by SBCL.

     SECTION 2.7    PRORATIONS.  All amounts previously paid or payable with 
respect to the items identified on Schedule 2.7, or for any other items 
reflecting actual costs incurred solely in connection with the provision of 
Lab EDI Services which are to be prorated on the basis of days, for or in 
respect of periods which straddle any Transfer Date shall be apportioned on a 
pro rata basis based on the respective number of days in the pre-Transfer 
Date and post-Transfer Date periods.

     SECTION 2.8    NON-TRANSFERABLE ASSETS.

                    2.8.1     To the extent that any SCAN Asset which would
otherwise be transferred on an Applicable Transfer Date (a "TRANSFERRED ASSET")
is not capable of being sold, assigned, transferred, conveyed or delivered
without obtaining a Required Consent, or if such sale, assignment, transfer,
conveyance or delivery or attempted sale, assignment, transfer, conveyance or
delivery would constitute a violation of any Contract or License constituting or
relating specifically to a Transferred Asset, or a violation of any Regulation,
or would result in the imposition of any significant additional Liability or
obligation on SBCL or ActaMed, or a substantial diminution in the value or use
of such Transferred Asset, this Assets Purchase Agreement shall not constitute a
sale, assignment, transfer, conveyance or delivery of such Transferred Asset or
an attempted sale, assignment, transfer, conveyance or delivery thereof, nor
shall it constitute an assumption of any Liability under any Contract or License
constituting or relating specifically to such Transferred Asset.  Any such
Transferred Asset and any Contract or License which constitutes or relates
exclusively to any such Transferred Asset or Assets shall be a "NON-TRANSFERABLE
ASSET".  SBCL shall use its best efforts, and ActaMed shall reasonably cooperate
therein, to provide ActaMed with the benefit of any such Non-Transferable Asset.

                    2.8.2     Anything in this Assets Purchase Agreement to the
contrary notwithstanding, SBCL shall not be obligated to sell, assign, transfer,
convey or deliver, or cause to be sold, assigned, transferred, conveyed or
delivered to ActaMed, and ActaMed shall not be obligated to purchase or assume,
any Non-Transferable Asset without first having obtained all Required Consents
or prevented the imposition of such Liability or obligation or diminution in
value or use.  Both before and after the Applicable Transfer Date, SBCL and
ActaMed shall use their collective best efforts to obtain any Required Consents
or to prevent the imposition of any


                                    -10-
<PAGE>

such Liability or obligation or any such diminution in value or use so as to 
transfer each such Non-Transferable Asset to ActaMed without adversely 
modifying, amending or burdening such Non-Transferable Asset.  Any costs 
associated with such efforts shall be borne by SBCL.

                    2.8.3     To the extent that on a given Transfer Date, there
is any Non-Transferable Asset, SBCL shall, from and after such Transfer Date,
cooperate with ActaMed in any reasonable and lawful arrangement designed to
provide the benefit of such Non-Transferable Asset to ActaMed, and ActaMed, so
long as such benefit is so provided, shall satisfy or perform any Liability
under or in connection with such Non-Transferable Asset which would be a
Liability assumed by ActaMed if such Non-Transferable Asset were a Transferred
Asset.  Any costs associated with such efforts shall be borne by SBCL.

                    2.8.4     At any time after a given Transfer Date, if any
Non-Transferable Asset becomes capable of being sold, assigned, transferred,
conveyed or delivered to ActaMed without a violating any Contract, License or
Regulation or resulting in the imposition of any significant additional
Liability or obligation on SBCL or ActaMed or a substantial diminution in the
value or use of such Asset, then, at such time, such Non-Transferable Asset
shall be deemed to have been sold, assigned, transferred, conveyed and delivered
to ActaMed effective as of the Applicable Transfer Date hereof pursuant to the
execution and delivery of a Bill of Sale and Assignment and an Assumption
Agreement with respect to the Transferred Assets on such Applicable Transfer
Date; PROVIDED, HOWEVER, that if and to the extent that SBCL has theretofore
provided ActaMed with comparable assets or compensation for such Asset, an
equitable adjustment shall be made between SBCL and ActaMed to effectuate fully
the intent of the foregoing provision.


                                      ARTICLE 3   

                            REPRESENTATIONS AND WARRANTIES


     SECTION 3.1    BY SBCL.  Except as set forth on a Disclosure Schedule
hereto, SBCL hereby represents and warrants to ActaMed, and shall (except as
contemplated by Section 2.5.2 hereof) represent and warrant to ActaMed on each
Transfer Date as to itself and the SCAN Assets being transferred on such
Transfer Date, as follows:

                    3.1.1     CAPACITY AND VALIDITY.  SBCL has the full power
and corporate authority necessary to enter into and perform its obligations
under this Assets Purchase Agreement and the other documents to be executed and
delivered by SBCL hereunder or in connection herewith (the "SBCL DOCUMENTS") and
to consummate the transactions contemplated hereby and thereby.  This Assets
Purchase Agreement and all other SBCL Documents have been or will be duly
executed and delivered by SBCL, and constitute or will constitute the legal,
valid and binding obligations of SBCL, enforceable in accordance with their
respective terms except as enforceability may be limited by applicable equitable
principles, or by bankruptcy, insolvency, reorganization, moratorium or similar
laws from time to time in effect


                                    -11-
<PAGE>

affecting the enforcement of creditors' rights generally.   The execution, 
delivery and performance of this Assets Purchase Agreement or any other SBCL 
Document, and the consummation of the transactions contemplated hereby or 
thereby, will not violate any provisions of the articles of incorporation or 
bylaws of SBCL, or any Regulation or Court Order to which SBCL is subject.

                    3.1.2     ORGANIZATION, GOOD STANDING AND FOREIGN
QUALIFICATION.  SBCL is a corporation duly incorporated, validly existing and in
good standing under the laws of Delaware, and has the corporate power and
authority to carry on its business in such places as it has been and is now
being conducted, and to own and lease the properties and assets which it now
owns or leases, in each case in connection with its provision of Lab EDI
Services.

                    3.1.3     PROJECTIONS.

                              (a)  The aggregate costs reflected by the line 
items [*] attached hereto as DISCLOSURE SCHEDULE 3.1.3 (the "PROJECTIONS") 
are accurate in all material respects and do not omit to state any material 
fact required to be stated therein to make such Projections not misleading; 
PROVIDED that such Projections are indicative only of general expenses 
(excluding one-time or transactional expenses, which include any expenses 
incurred with respect to this transaction) for [*] projected to be incurred 
in connection with SBCL's provision of Lab EDI Services to [*] SCAN Sites and 
assume that ActaMed will provide services to only such number of SCAN Sites 
and only in the same manner that SBCL did prior to transfer.

                              (b)  The Projections were prepared in accordance
with the books and records of SBCL in all material respects, which books and
records have been properly maintained and are complete and correct in all
material respects.

                              (c)  SBCL has not received any advice or
notification from its independent certified public accountants that SBCL has
used any improper accounting practice that would have the effect of not
reflecting or incorrectly reflecting in the Projections any expenses associated
with SBCL's provision of Lab EDI Services.

                    3.1.4     ABSENCE OF CHANGES.  Except as contemplated by
this Assets Purchase Agreement, since December 1, 1997, SBCL's provision of Lab
EDI Services has been carried on only in the ordinary course of SBCL's business,
and there has not been any transaction or occurrence in which SBCL has:

                              (a)  suffered or experienced any event or
condition materially increasing the expenses incurred by SBCL in the provision
of Lab EDI Services;

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                    -12-
<PAGE>

                              (b)  increased the rate of compensation payable or
to become payable by it to any of the Transferred Employees or agreed to do so,
except general hourly rate increases, normal merit increases and increases due
to promotions;

                              (c)  failed to provide notice to ActaMed that it
hired or committed to hire any Person who will perform services directly
relating to SBCL's provision of Lab EDI Services, or terminated or received the
resignation of any Transferred Employee;  

                              (d)  through negotiation or otherwise, made any
commitment or incurred any Liability, whether or not enforceable, to any labor
organization affecting Transferred Employees;

                              (e)  directly or indirectly paid or entered into a
Contract to pay any severance or termination pay to any Transferred Employee; 

                              (f)  experienced problems with the SCAN Network 
or [*] (as defined in the Services Agreement) (such as network operations, 
quality assurance or software development problems) which have materially and 
adversely affected SBCL's provision of Lab EDI Services to SBCL Sites in 
Regions not yet transferred to ActaMed pursuant to this Assets Purchase 
Agreement.

                    3.1.5     REAL PROPERTY.  SBCL neither owns nor leases
(either as lessee or lessor) any real property related exclusively to its
provision of Lab EDI Services. 

                    3.1.6     PERSONAL PROPERTY.

                              (a)  SBCL owns and has good title to the SCAN
Assets, free and clear of any and all Liens of any kind or nature.

                              (b)  DISCLOSURE SCHEDULE 3.1.6 contains  (i) a
sample configuration of a PC System which is representative of PC Systems
provided to Automated Providers by SBCL for the provision of Lab EDI Services,
and (ii) a list of the SCAN Assets in the Region being transferred, which list
is true and complete in all material respects to the best of SBCL's knowledge. 

                              (c)  SBCL does not lease any equipment, machinery
or other items of tangible personal property for use exclusively in the
provision of Lab EDI Services.  SBCL does not lease any personal property as
lessor in connection with its provision of Lab EDI Services.

                              (d)  As of the Region One Transfer Date, there 
are not less than [*] SBCL Sites located in all Regions.

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                    -13-
<PAGE>

                    3.1.7     COMPLIANCE WITH LAWS.

                              (a)  To the best knowledge of SBCL, in its
provision of Lab EDI Services, SBCL has complied in all material respects with
all applicable Regulations relating to the provision of Lab EDI Services.

                              (b)  To the best knowledge of SBCL, the SCAN
Software complies as of the Region One Transfer Date with all applicable
Regulations relating to SBCL's provision of Lab EDI Services.

                              (c)  SBCL has obtained all consents or approvals
required from, has made all necessary filings with, and has provided all
required notices to, any governmental body or agency or any other third party in
connection with the execution and delivery of this Assets Purchase Agreement or
any of the SBCL Documents.

                    3.1.8     LITIGATION AND CLAIMS.  There are no outstanding
Court Orders or quasi-judicial or administrative decisions to which SBCL is
subject relating to the SCAN Assets located at SBCL Sites and there is no
Litigation pending or, to SBCL's knowledge, threatened relating to (i) the SCAN
Assets located at SBCL Sites or (ii) SBCL's provision of Lab EDI Services.  SBCL
has not been advised by any attorney representing it that there are any "loss
contingencies" (as defined in FASB 5), which would be required by FASB 5 to be
disclosed or accrued in SBCL's financial statements by reason of the Lab EDI
Services provided by SBCL.

                    3.1.9     CONTRACTS AND COMMITMENTS; WARRANTIES.

                              (a)  DISCLOSURE SCHEDULE 3.1.9 contains, to the
best knowledge of SBCL, a list, which is true and correct in all material
respects, of all Vendor Contracts and all Contracts to which SBCL is a party
solely because it provides Lab EDI Services using the SCAN Network, except for
Contracts (other than Vendor Contracts) that (i) are terminable on thirty (30)
days or less notice by SBCL without any Liability, (ii) are described in any
other Section of the Disclosure Schedule hereto, or (iii) do not require
payments in excess of $5,000 in the aggregate following the date hereof (unless
renewed which renewal is at the discretion of ActaMed).

                              (b)  Each of the Contracts listed in DISCLOSURE
SCHEDULE 3.1.9, or described in this Section 3.1.9, is in full force and effect.
No Default by SBCL under any of the terms or conditions set forth in any of the
Contracts to which SBCL is a party or any document or instrument related thereto
has occurred or been asserted by any party which could result in acceleration of
any obligations under or termination of the Contract.  The execution, delivery
and performance of this Assets Purchase Agreement or any other SBCL Document,
and the consummation of the transactions contemplated hereby or thereby, will
not conflict with, result in a breach of, or constitute a Default under any
Contract to which SBCL is a party or by which it is bound, affect the
continuation, validity and effectiveness of any of such Contracts, or any terms
thereof, or result in the creation of any Lien upon any of the SCAN Assets
located at SBCL Sites, or result in the acceleration of the maturity of any
payment date of any of SBCL's


                                    -14-
<PAGE>

obligations, or increase or adversely affect the obligations of SBCL 
thereunder.  SBCL has provided, upon request, true, correct and complete 
copies of the Contracts referred to in DISCLOSURE SCHEDULE 3.1.9 to ActaMed 
for review.

                    3.1.10    CONDITION OF ASSETS.  To the best of SBCL's
knowledge, the PC Systems located at SBCL Sites in a Region to be transferred on
an Applicable Transfer Date are in good operating condition so as to allow, in
the aggregate, a level of connectivity with the SCAN Network which is consistent
with SBCL's historically experienced level of connectivity.  No representation
or warranty is hereby given as to the condition or state of repair of any
individual component of a PC System.

                    3.1.11    BROKERS AND FINDERS.  No third party is entitled
to receive any commission, fees or similar consideration in connection with the
transactions contemplated by this Assets Purchase Agreement based on any
arrangement or agreement made by or on behalf of SBCL.


                    3.1.12    INVESTMENT REPRESENTATIONS; LEGEND ON SHARES.

                              (a)  SBCL hereby acknowledges that (i) the shares
of Series D Preferred Stock (or, if applicable, Conversion Shares) delivered
pursuant to this Assets Purchase Agreement have not been registered under the
Securities Act, and the resale of such shares is therefore subject to
restrictions imposed by federal and state securities laws including without
limitation that such shares cannot be sold or otherwise disposed of except in a
transaction which is registered under the Securities Act or exempted from
registration; (ii) ActaMed has advised SBCL, a reasonable time prior to the
execution of this Assets Purchase Agreement, that the shares have not been
registered under the Securities Act; and (iii) all certificates representing the
shares delivered to SBCL shall be stamped or otherwise imprinted with a legend
substantially in the following form (together with any other legend required by
state law), and that stop transfer orders will be given to ActaMed's transfer
agent:

               "THESE SECURITIES HAVE NOT BEEN REGISTERED
               UNDER THE SECURITIES ACT OF 1933 OR ANY STATE
               SECURITIES ACTS AND MAY NOT BE TRANSFERRED OR
               OTHERWISE DISPOSED OF UNLESS THEY HAVE BEEN
               REGISTERED UNDER THE SECURITIES ACT OF 1933 AND
               ANY APPLICABLE STATE SECURITIES ACTS OR
               EXEMPTIONS FROM SUCH REGISTRATIONS ARE
               AVAILABLE."

                              (b)  SBCL is an accredited investor (as such term
is defined in Rule 506 of Regulation D promulgated by the SEC) and is acquiring
the shares of Series D Preferred Stock (and, if applicable, Conversion Shares)
for its own account for investment purposes only, and not with a view to the
distribution, transfer, or assignment of the same in whole or in part.  SBCL has
been represented by counsel and advisers, each of whom has been


                                    -15-
<PAGE>


previously selected by SBCL, as SBCL has found necessary to consult 
concerning this Assets Purchase Agreement and the shares to be issued 
pursuant to this Assets Purchase Agreement.  SBCL, either alone or with its 
representative(s), has such knowledge and experience in financial or business 
matters that it is capable of evaluating the merits and risks of the 
prospective investment.  SBCL and its counsel and other advisers have been 
provided with such information concerning ActaMed as they have deemed 
relevant with respect to SBCL's investment decision relating to the shares 
being delivered to it.  SBCL has had a reasonable opportunity to ask 
questions and receive answers concerning the terms and conditions of the 
transactions contemplated by this Assets Purchase Agreement, to discuss 
ActaMed's business, management and financial affairs with the management of 
ActaMed, and to obtain any additional information which ActaMed possesses or 
can acquire without unreasonable effort or expense that is necessary to 
verify the accuracy of the information furnished.  SBCL has received 
satisfactory responses from management of ActaMed to SBCL's inquiries.

                    3.1.13    THIRD PARTY SOFTWARE.  SBCL has sufficient rights
and licenses in Third Party Software to convey the rights contemplated by
Section 1.2 hereof, free and clear of any liens, claims or encumbrances, in each
case subject to the exclusions and limitations expressly set forth in Section
1.2 hereof.

                    3.1.14    SCHEDULES.  All Sections of the Disclosure
Schedule referenced in this Section 3.1 are true, correct and complete as of the
date of this Assets Purchase Agreement, and will be true, correct and complete
as of each Transfer Date.  Matters disclosed in each such Section of the
Disclosure Schedule shall be deemed disclosed for purposes of the matters to be
disclosed in any Section of the Disclosure Schedule.

     SECTION 3.2    BY ACTAMED.  Except as set forth on a Disclosure Schedule
hereto, ActaMed hereby represents and warrants to SBCL, and will represent and
warrant to SBCL on each Transfer Date, as follows:

                    3.2.1     ORGANIZATION, GOOD STANDING AND AUTHORITY. 
ActaMed is a duly organized and validly existing corporation in good standing
under the laws of the State of Georgia and has full corporate power and
authority to carry on its business, to own and operate its properties and
assets, and to consummate the transactions contemplated by this Assets Purchase
Agreement and the other documents to be executed and delivered by ActaMed
hereunder (the "ACTAMED DOCUMENTS").  ActaMed is currently engaged in the
ActaMed Business and is qualified to do business as a foreign corporation in
each jurisdiction in which the failure to be so qualified would have a Material
Adverse Effect.  The Fourth Amended Articles have been duly filed and are
currently in effect.  ActaMed has delivered to SBCL true, correct and complete
copies of the Fourth Amended Articles and the bylaws of ActaMed, including all
amendments thereto, as presently in effect.  ActaMed has all governmental
licenses, authorizations, consents and approvals required to carry on the
ActaMed Business as now conducted and as proposed to be conducted and to own,
operate and lease its properties and


                                    -16-
<PAGE>


assets, except for those licenses, authorizations, consents and approvals the 
failure of which to have would not have a Material Adverse Effect.

                    3.2.2     AUTHORIZATION OF AGREEMENT, NO BREACH.  The
execution and delivery of this Assets Purchase Agreement have been duly
authorized by all necessary corporate action on the part of ActaMed, and no
further corporate action of any nature is required pursuant to the Articles or
the bylaws of ActaMed.  All Persons who have executed or will execute this
Assets Purchase Agreement, or any other agreement or document called for by this
Assets Purchase Agreement on behalf of ActaMed have been duly authorized to do
so by all necessary corporate action.  This Assets Purchase Agreement and the
other ActaMed Documents have been duly executed and delivered by ActaMed and
constitute legal, valid and binding obligations of ActaMed, enforceable against
ActaMed in accordance with their respective terms, except as enforceability may
be limited by applicable equitable principles, or by bankruptcy, insolvency,
reorganization, moratorium or similar laws from time to time in effect affecting
the enforcement of creditors' rights generally.  The execution, delivery and
performance of this Assets Purchase Agreement and the other ActaMed Documents
and the consummation of the transactions contemplated hereby and thereby will
not (1) violate or result in a breach of or Default or acceleration under the
Articles or the bylaws of ActaMed or any material contract to which ActaMed is a
party or is bound, (2) violate any Court Order, quasi-judicial or administrative
decision or award of any court, arbitrator, mediator, tribunal, administrative
agency or governmental body applicable to or binding upon ActaMed or upon the
securities, property or business of ActaMed or (3) violate any Regulation
relating to ActaMed, or to the securities, property, or business of ActaMed.

                    3.2.3     ACTAMED FINANCIAL STATEMENTS.

                              (a)  DISCLOSURE SCHEDULE 3.2.3 hereto contains a
true and correct copy of (i) the balance sheets of ActaMed at December 31, 1995
and December 31, 1996 and the statements of operations, statements of
stockholders equity and statements of cash flows of ActaMed for the years ended
December 31, 1995 and December 31, 1996, which have been audited by Deloitte &
Touche, LLP independent accountants (the "ACTAMED FINANCIAL STATEMENTS"),  and
(ii) the unaudited balance sheets of ActaMed at September 30, 1997 and the
statements of operations, statements of stockholders equity and statements of
cash flows of ActaMed for quarter ended September 30, 1997 (the "ACTAMED
UNAUDITED STATEMENTS").

                              (b)  The ActaMed Financial Statements have been
prepared in accordance with GAAP applied on a consistent basis during the
respective periods covered thereby.  The ActaMed Financial Statements are
correct and complete and present fairly in all material respects the financial
position of ActaMed at the date of the balance sheets included therein and the
results of operations and cash flows of ActaMed for the respective periods
covered by the statements of operations and cash flows included therein. 
ActaMed has no material obligations or liabilities of any nature whatsoever
(whether absolute, accrued, contingent or otherwise and whether due or not due)
which would be required by GAAP to be


                                    -17-
<PAGE>

disclosed in the ActaMed Financial Statements and which, either individually 
or in the aggregate, would have a Material Adverse Effect and which are not 
disclosed by the ActaMed Financial Statements.

                              (c)  The ActaMed Unaudited Statements have been
prepared in reasonable detail and in accordance with GAAP applied consistently
throughout the periods reflected therein (except as otherwise disclosed therein)
and certified by the chief financial officer of ActaMed as presenting fairly the
financial condition and results of operations of ActaMed and any of its
Subsidiaries for the periods covered by the statements (subject to customary
exceptions for interim unaudited financial statements).

                    3.2.4     CONSENTS.  No consent, approval or authorization
of, or qualification, designation, declaration or filing with, or notice to any
governmental authority on the part of ActaMed is required in connection with (a)
the valid execution and delivery of the ActaMed Documents and (b) the issuance
of the shares of Series D Preferred Stock (and, if applicable, the Conversion
Shares), except the filing of the Fourth Amended Articles in the office of the
Secretary of State of the State of Georgia, which filing will be accomplished
concurrently with the execution and delivery of this Assets Purchase Agreement.

                    3.2.5     CAPITALIZATION.

                              (a)  After giving effect to the authorization of
the shares of Series D Preferred Stock, the capital stock of ActaMed, as
authorized by its Articles consists of the authorized, issued and outstanding
capital stock set forth on DISCLOSURE SCHEDULE 3.2.5.  None of such issued
shares is held in the treasury of ActaMed.  ActaMed does not have outstanding
any stock or securities convertible into or exchangeable for any shares of its
capital stock and no Person has any right against ActaMed to subscribe for or to
purchase, or any options for the purchase, or any agreements providing for the
issuance, of any capital stock or any stock or securities convertible into
capital stock of ActaMed.
                              (b)  All of the issued and outstanding shares 
of ActaMed capital stock have been validly issued and are fully paid and 
non-assessable.  The shares of Series D Preferred Stock, when issued to SBCL 
pursuant to this Assets Purchase Agreement, will be validly issued, fully 
paid and nonassessable, will have the designations, preferences, limitations, 
and relative rights set forth in the Articles and will be free and clear of 
all liens, claims and encumbrances.  Any and all of the Conversion Shares, 
when issued, will be validly issued, fully paid and nonassessable.

                    3.2.6     REGISTRATION RIGHTS.  Except as set forth in the
Registration Rights Agreement, ActaMed will not be under any obligation to
register under the Securities Act any of its then outstanding securities or any
of its securities which may thereafter be issued.

                    3.2.7     OFFERING.  Subject to the accuracy of
representations and warranties by SBCL in Section 3.1 hereof, the issuance of
the shares of Series D Preferred Stock (and the


                                    -18-
<PAGE>

issuance of the Conversion Shares) on the Applicable Transfer Date 
constitutes a transaction exempt from the registration requirements of 
Section 5 of the Securities Act, and from the qualification requirements of 
any applicable state securities or "blue sky" laws.

                    3.2.8     CHANGES.  Since the date of the latest ActaMed
Unaudited Statements, there has not been (i) any adverse change in the assets,
liabilities, financial condition or operations of the ActaMed Business from that
reflected in the ActaMed Financial Statements, other than changes in the
ordinary course of business, none of which individually or in the aggregate has
had a Material Adverse Effect or (ii) any adverse change in the prospects of the
ActaMed Business or any other event or condition (or events or conditions) of
any character which, either individually or cumulatively, has had a Material
Adverse Effect.

                    3.2.9     SUBSIDIARIES.  Other than EDI Services Inc.,
ActaMed has no Subsidiaries.  Except as set forth in this Assets Purchase
Agreement, ActaMed does not own, or have the right to acquire, any securities or
other equity or ownership interest in any corporation, association or other
business entity or Person.

                    3.2.10    PENDING LITIGATION, ETC.  There are no actions at
law, suits in equity or other proceedings or, to the knowledge of ActaMed,
investigations in any court, tribunal or by or before any other governmental or
public authority or agency or any arbitrator or arbitration panel or any
governmental or private third-party insurance agency, pending or, to the
knowledge of ActaMed, threatened against or affecting ActaMed that either
individually or in the aggregate, would have a Material Adverse Effect, or,
would question the validity or enforceability of this Assets Purchase Agreement,
the ActaMed Documents, or any of the transactions contemplated hereby and
thereby.  ActaMed is not in default with respect to any Court Order.

                    3.2.11    TITLE TO PROPERTIES.  ActaMed has good and
marketable title to its properties and assets and has good title to all its
respective leasehold interests, in each case subject to no Lien, other than as
set forth on DISCLOSURE SCHEDULE 3.2.11 hereto.  DISCLOSURE SCHEDULE 3.2.11
accurately lists with respect to the personal property owned by ActaMed (i) each
financing statement, deed, agreement or other instrument which has been filed,
recorded or registered pursuant to any Regulation that names a business entity
as debtor or lessee or as the grantor or the transferor of the interest created
thereby, and (ii) as to each such financing statement, deed, agreement or other
instrument, the names of the debtor, lessee, grantor or transferor and the
secured party, lessor, grantee or transferee and the name of the jurisdiction in
which such financing statement, deed, agreement or other instrument has been
filed, recorded or registered.

                    3.2.12    INTELLECTUAL PROPERTY, ETC.  ActaMed owns or
possesses the rights to use, free from burdensome restrictions or conflicts with
the rights of others, all Intellectual Property necessary for the conduct of the
ActaMed Business as now conducted and as proposed to be conducted.  All licenses
constituting ActaMed's Intellectual Property are in full force and effect and
constitute legal, valid and binding obligation of the respective parties
thereto, and


                                    -19-
<PAGE>

there have not been and are not any Defaults thereunder by any party.  There 
are no outstanding options, licenses, or material agreements of any kind 
relating to the foregoing, nor is ActaMed bound by or a party to any options, 
licenses or agreements of any kind with respect to such Intellectual 
Property.  ActaMed has not received any communications alleging that it has 
violated or, by conducting its business as proposed, would violate any of the 
Intellectual Property rights of any other Person.  To ActaMed's knowledge, 
none of its employees is obligated under any contract (including licenses, 
covenants or commitments of any nature) or other agreement, or subject to any 
judgment, decree or order of any court or administrative agency, that would 
interfere with the use of their best efforts to promote the interests of 
ActaMed or that would conflict with the ActaMed Business as proposed to be 
conducted.  Neither the execution nor delivery of this Assets Purchase 
Agreement, nor the carrying on of the ActaMed Business by the employees of 
ActaMed, nor the conduct of the ActaMed Business as proposed, will, to 
ActaMed's knowledge, conflict with or result in a breach of the terms, 
conditions or provisions of, or constitute a Default under, any Contract 
under which any of such employees is now obligated.  ActaMed does not believe 
it is or will be necessary to utilize any inventions of any of its employees 
(or people it currently intends to hire) made prior to their employment by 
ActaMed.

                    3.2.13    COMPLIANCE WITH OTHER INSTRUMENTS.  ActaMed is not
in violation of or in Default in any material respect under any term of its
organizational documents, any term or provision of any mortgage, indenture,
contract, agreement, instrument, judgment or decree, and is not in violation in
any material respect of any applicable Regulation, and to ActaMed's knowledge,
there is no state of facts which, with the passage of time or giving of notice
or both, would constitute any such violation or Default that would in the
aggregate have a Material Adverse Effect.  The execution, delivery and
performance of and compliance with the ActaMed Documents, the issuance of the
shares of Series D Preferred Stock (and the Conversion Shares) and the
consummation of any other transaction contemplated by the ActaMed Documents have
not resulted and will not result in any such violation, or be in conflict with,
or constitute a Default under any of the foregoing, or result in the creation of
any Lien upon any of the properties or assets of ActaMed.

                    3.2.14    COMPLIANCE WITH LAW.  ActaMed is in compliance
with all Regulations to which it is subject, the violation of which, either
individually or in the aggregate, would have a Material Adverse Effect.  The
execution, delivery or performance of this Assets Purchase Agreement or any of
the other ActaMed Documents, and the consummation of the transactions
contemplated by the ActaMed Documents, will not cause ActaMed to be in violation
of any Regulation.

                    3.2.15    EMPLOYEES.  To the knowledge of ActaMed, no
employee of ActaMed is in violation of any term of any employment contract,
patent disclosure agreement or any other Contract relating to the Intellectual
Property of ActaMed or the relationship of any such employee with such entity or
any other party. 


                                    -20-


<PAGE>

                    3.2.16    EMPLOYEE BENEFIT PLANS.


                              (a)  DISCLOSURE SCHEDULE  3.2.16  contains a
current, correct and complete list of all the Employee Benefit Plans. 

                              (b)  All Employee Benefit Plans conform (and at
all times have conformed) in all material respects to, and are being
administered and operated (and have at all times been administered and operated)
in material compliance with, the requirements of ERISA, the Code and all other
applicable Regulations.  All returns, reports and disclosure statements required
to be made under ERISA and the Code with respect to all such Employee Benefit
Plans have been timely filed or delivered.  There have not been any "prohibited
transactions," as such term is defined in Section 4975 of the Code or Section
406 of ERISA, involving any of the Employee Benefit Plans, that could subject
ActaMed to any material penalty or tax imposed under the Code or ERISA.

                              (c)  Any Employee Benefit Plan intended to be
qualified under Section 401(a) of the Code and exempt from tax under Section
501(a) of the Code has been determined by the Internal Revenue Service to be so
qualified or an application for such determination is pending.  Any such
determination that has been obtained remains in effect and has not been revoked,
and with respect to any application that is pending, ActaMed has no reason to
suspect that such application for determination will be denied.  Nothing has
occurred since the date of any such determination that is reasonably likely to
affect adversely such qualification or exemption, or result in the imposition of
excise taxes or income taxes or unrelated business income under the Code or
ERISA with respect to any such Employee Benefit Plan.

                              (d)  ActaMed and the ERISA Affiliates do not
sponsor or contribute to, and have not in the past sponsored or contributed to,
and have no Liability with respect to, any defined benefit plan subject to Title
IV of ERISA or any multi-employer plan (as defined in Section 3(37) of ERISA). 
Neither ActaMed nor any ERISA Affiliate has any current or contingent obligation
to any multi-employer plan (as defined in Section 3(37) of ERISA). ActaMed does
not have any Liability with respect to any employee benefit plan or arrangement
other than with respect to the Employee Benefit Plans listed in DISCLOSURE
SCHEDULE 3.2.16.

                              (e)  There are no pending or, to the knowledge of
ActaMed, threatened claims by or on behalf of any such Employee Benefit Plans,
or by or on behalf of any individual participants or beneficiaries of any such
Employee Benefit Plans, alleging any violation of ERISA or any other Applicable
Regulations, or claiming benefit payments (other than those made in the ordinary
operation of such plans), nor is there, to the knowledge of ActaMed, any basis
for such claim.  Such Employee Benefit Plans are not the subject of any pending
(or to the knowledge of ActaMed, any threatened) investigation or audit by the
Internal Revenue Service, the U.S. Department of Labor or the Pension Benefit
Guaranty Corporation or any similar regulatory agency, foreign or domestic.


                                    -21-
<PAGE>

                              (f)  ActaMed has timely made all required payments
and contributions under the Employee Benefit Plans including the payment of all
insurance premiums.  All such payments and contributions have been deducted
fully by ActaMed for federal income tax purposes.  Such deductions have not been
challenged or disallowed by any governmental entity and ActaMed has no reason to
believe that such deductions are not properly allowable.  ActaMed has not
incurred any Liability for any tax, excise tax, penalty or fee with respect to
any Employee Benefit Plan, and, to the best of ActaMed's knowledge, no event has
occurred and no circumstance exists or has existed that could give rise to any
such Liability.  

                              (g)  The execution of and performance of the
transactions contemplated by this Assets Purchase Agreement will not (either
alone or upon the occurrence of any additional or subsequent events) result in
any payment, acceleration, vesting or increase in benefits with respect to any
employee or former employee of ActaMed, including one that would be an "excess
parachute payment" under Section 280G of the Code.

                              (h)  ActaMed does not maintain any plan or
arrangement that provides post retirement medical benefits, post retirement
death benefits or other post retirement welfare benefits, other than to the
extent required by Part 6 of Title I of ERISA.  

                              (i)  ActaMed does not maintain or contribute to,
nor has it in the past maintained or contributed to, any "welfare benefit fund"
(within the meaning of Section 419 of the Code).

                              (j)  Any Employee Benefit Plan that is a group
health plan (within the meaning of Section 4980B(g)(2) of the Code) complies and
has been administered in material respects in accordance with all of the
applicable requirements of Section 4980B of the Code, Part 6 of Title I of
ERISA, Title XXII of the Public Health Service Act, the Social Security Act and
all other applicable Regulations.

                              (k)  Any Employee Benefit Plan that is a group
health plan (within the meaning of Section 4980D(f)(1) of the Code) complies and
has been administered in material respects in accordance with all of the
applicable requirements of Subtitle K of the Code, Part 7 of Title I of ERISA, 
the Public Health Service Act and all other applicable Regulations, and

                              (l)  Neither ActaMed nor any ERISA Affiliate has
contributed to a non-conforming group health plan (as that term is defined in
Code section 5000(c)) or incurred any tax liability under Code section 5000(a).

                    3.2.17    COMPLIANCE WITH ENVIRONMENTAL LAWS.

                              (a)  ActaMed is in compliance with all applicable
environmental Regulations applicable to the ActaMed Business with respect to all
discharges into the ground and surface water, emissions into the ambient air and
generation, accumulation,


                                    -22-

<PAGE>

storage, treatment, recycling, transportation, labeling or disposal of waste 
materials or process by-products, except violations which, either 
individually or in the aggregate, would not have a Material Adverse Effect.  
ActaMed is not liable for any material penalties, fines or forfeitures for 
failure to comply with any of the foregoing.  All licenses, permits or 
registrations required for the ActaMed Business as presently conducted and 
proposed to be conducted, under any environmental Regulations have been or 
will, in a timely manner, be obtained or made, other than such licenses, 
permits or registrations as to which the failure to obtain or make, either 
individually or in the aggregate, will not have a Material Adverse Effect, 
and ActaMed is in compliance therewith in all material respects.

                              (b)  No release, emission or discharge into the
environment of hazardous substances, as defined under the Comprehensive
Environmental Response, Compensation, and Liability Act, as amended, or
hazardous waste, as defined under the Resource Conservation and Recovery Act, or
air pollutants as defined under the Clean Air Act, or pollutants, as defined
under the Clean Water Act, by ActaMed has occurred or is presently occurring on
or from any property owned or leased by ActaMed in excess of federal, state or
local permitted releases or reportable quantities, or other concentrations,
standards or limitations under the foregoing Regulations governing the
protection of health and the environment or under any other Regulations (then or
now applicable, as the case may be) other than such releases, emissions or
discharges, either individually or in the aggregate, would not have a Material
Adverse Effect.

                              (c)  To its knowledge, ActaMed has never (1)
owned, occupied or operated a site or structure on or in which any hazardous
substance was or is stored, transported or disposed of in violation of any
environmental Regulations at such time as such site or structure was owned,
occupied or operated by ActaMed or at any other time, or (2) transported or
arranged for the transportation of any hazardous substance other than in full
compliance with all applicable environmental Regulations governing the ActaMed
Business or the storage, transportation or disposal of hazardous substances
except for such violations as, either individually or in the aggregate, would
not have a Material Adverse Effect.  ActaMed has never caused or been held
legally responsible for any release or threatened release of any hazardous
substance, or received notification from any federal, state or other
governmental authority of any such release or threatened release, or that
ActaMed may be required to pay any costs or expenses incurred or to be incurred
in connection with any efforts to mitigate the environmental impact of any
release or threatened release, of any hazardous substance from any site or
structure owned, occupied or operated by ActaMed, except such releases or
threatened releases as, either individually or in the aggregate, would not have
a Material Adverse Effect.

                    3.2.18    INSURANCE.  The ActaMed Business has fire,
casualty, liability, and business interruption insurance policies with
recognized insurers, in such amounts and with such coverage as set forth on
DISCLOSURE SCHEDULE 3.2.18. 


                                    -23-

<PAGE>

                    3.2.19    MATERIAL CONTRACTS AND AGREEMENTS.  DISCLOSURE
SCHEDULE 3.2.19 lists the parties to, and subject matter of, all material
Contracts of the ActaMed Business, including without limitation, all employment
or labor contracts, leases or compensation plans.  Except as set forth on such
Schedule, all Contracts set forth on such list are valid, binding, and in full
force and effect, without any breach by ActaMed or, to ActaMed's knowledge, any
other party thereto.

                    3.2.20    TAXES.  All federal, state and other tax returns
of ActaMed required by law to be filed have been duly filed and all federal,
state and other Taxes, assessments, fees and other federal governmental charges
upon ActaMed or any of the properties, incomes or assets of ActaMed that are due
and payable have been paid.  No extensions of the time for the assessment of
deficiencies have been granted to ActaMed in connection with any federal tax,
assessment, fee or other federal governmental charge.  There are no Liens, on
any properties or assets of the ActaMed Business imposed or arising as a result
of the delinquent payment or the non-payment of any tax, assessment, fee or
other governmental charge that, either individually or in the aggregate, would
have a Material Adverse Effect.

                              (a)  ActaMed has not assumed and is not liable for
any Tax liability of any other Person, including any predecessor corporation, as
a result of any purchase of assets or other business acquisition transaction; 

                              (b)  ActaMed has not indemnified or agreed to
indemnify any other Person or otherwise agreed to pay on behalf of any other
Person tax liability growing out of or which may be asserted on the basis of any
tax treatment adopted with respect to all or any aspect of such a business
acquisition transaction;

                              (c)  The charges, accruals and reserves, if any,
on the books of ActaMed in respect of all Taxes for all fiscal periods to date
are adequate in accordance with GAAP, and ActaMed knows of no additional unpaid
assessments for such periods or other governmental charges payable by ActaMed in
connection with the execution and delivery of this Assets Purchase Agreement,
the ActaMed Documents or the issuance of the Shares of Series D Preferred Stock
by ActaMed, other than stock transfer taxes, recording fees and filing fees in
connection with state securities or "blue sky" filings.

                    3.2.21    INVESTMENT COMPANY.  ActaMed is not an "investment
company", or an "affiliated person" of an "investment company", or a company
"controlled" by an "investment company" as such terms are defined in the
Investment Company Act of 1940, as amended, and ActaMed is not an "investment
adviser" or an "affiliated person" of an "investment adviser" as such terms are
defined in the Investment Advisers Act of 1940, as amended.


                                    -24-

<PAGE>

                    3.2.22    LABOR RELATIONS.  ActaMed is not engaged in any
unfair labor practices.  There is:

                              (a)  no unfair labor practice complaint pending
or, to the best of ActaMed's knowledge, threatened against ActaMed before the
National Labor Relations Board or any court or labor board, and no grievance or
arbitration proceedings arising out of or under collective bargaining agreements
is so pending or, to the best of ActaMed's knowledge, threatened,

                              (b)  no strike, lock-out, labor dispute, slowdown
or work stoppage pending or, to the best of ActaMed's knowledge, threatened
against ActaMed, and

                              (c)  no union representation or certification
question existing or pending with respect to the employees of ActaMed, and, to
the best knowledge of ActaMed, no union organization activity taking place,
other than such actions or proceedings as, either individually or in the
aggregate, would not have a Material Adverse Effect.

                    3.2.23    NO CONFLICT OF INTEREST.  ActaMed is not indebted,
directly or indirectly, to any Substantial Holder, or, to ActaMed's knowledge,
to any Affiliate of a Substantial Holder, in any amount whatsoever.  To the best
knowledge of ActaMed, no Substantial Holders, or any of their Affiliates, are
indebted to any firm or corporation with which ActaMed is affiliated or with
which ActaMed has a business relationship, or any firm or corporation which
competes with ActaMed.  Except as contemplated by the ActaMed Documents, no
Substantial Holder, or, to ActaMed's knowledge, any Affiliate of a Substantial
Holder, is directly or indirectly interested in any contract with ActaMed or any
of its Subsidiaries.

                    3.2.24    BROKERS OR FINDERS.  No broker, agent, finder or
consultant or other Person has been retained by or on behalf of ActaMed (other
than legal or accounting advisors), or is or may be entitled to be paid based
upon any agreements or understandings made by ActaMed in connection with the
transactions contemplated hereby.

                    3.2.25    FULL DISCLOSURE.  This Assets Purchase Agreement,
the other ActaMed Documents, and any report or financial statement referred to
in this Section 3.2 hereof and any certificate, report, statement or other
writing furnished to  SBCL by or on behalf of ActaMed in connection with the
negotiation of this Assets Purchase Agreement and the other ActaMed Documents
and the sale of the shares of Series D Preferred Stock, taken as a whole, do not
contain any untrue statement of a material fact or omit to state a material fact
with respect to which disclosure has been requested and which is necessary to
make the statements contained herein or therein not misleading.


                                    -25-
<PAGE>



                                      ARTICLE 4   

                                  TRANSITION MATTERS


     SECTION 4.1    PRIOR TO REGION TRANSFER.

                    4.1.1     SBCL CONTINUED OPERATION.  Except (i) as 
contemplated by the Implementation Plan, (ii) with the prior written consent 
of ActaMed, or (iii) as necessary to effect the transactions contemplated by 
this Assets Purchase Agreement, SBCL shall, with respect to all SBCL Sites in 
each Region which has not been transferred, until the Applicable Transfer 
Date for the Region:

                              (a)  provide Lab EDI Services using the SCAN
Network in substantially the same manner as presently being conducted;

                              (b)  use its best efforts to preserve its present
relationships with Automated Providers and vendors; and

                              (c)  notify ActaMed of any development materially
and adversely affecting its ability to provide Lab EDI Services, and of any
governmental complaints, investigations or hearings (or written communications
indicating that the same is contemplated) or administrative proceedings,
involving its ability to provide Lab EDI Services, and permit its
representatives prompt access to all materials prepared in connection therewith.

                    4.1.2     SCAN EXPENSE STATEMENTS.  SBCL will cooperate with
ActaMed and Ernst & Young, or another of the "Big 6" national accounting firms
chosen by ActaMed and approved by SBCL ("CPA"), and provide CPA access to SBCL's
business and accounting records relating to SBCL's provision of Lab EDI Services
so that CPA may prepare audited financial statements, as of December 31, 1995,
December 31, 1996, and December 31, 1997, with respect to SBCL's provision of
such services, to the extent required for ActaMed to complete a registration of
the ActaMed Common Stock with the Securities Exchange Commission.  ActaMed will
be responsible for, and pay, the expense of said audit, and ActaMed and SBCL
shall use their collective best efforts to cause said audit to be completed on
or prior to April 30, 1998.

     SECTION 4.2    REGION TRANSITION MATTERS.

                    4.2.1     IMPLEMENTATION PLAN.  (a) As a further condition
precedent to the occurrence of the Region One Transfer Date, the parties have
prepared a detailed plan regarding the transition of SBCL Sites into ActaMed
Sites (the "IMPLEMENTATION PLAN"), a copy of which is attached hereto as
SCHEDULE 4.2.1.  SBCL's nominees to the Implementation Committee shall review
the Implementation Plan and shall notify ActaMed as to any proposed changes to
the Implementation Plan on or prior to January 15, 1998.  ActaMed shall
implement all such


                                    -26-
<PAGE>

changes, except to the extent its designees to the Implementation Committee 
reasonably believe that any such change would materially impact ActaMed's 
ability to meet the Transfer Benchmarks or the Performance Standards (as 
defined in the Services Agreement), or would have a Material Adverse Effect 
on ActaMed.  If SBCL's designees to the Implementation Committee disagree 
with ActaMed's assessment of a proposed change, the dispute shall be resolved 
in accordance with the provisions of Article IX hereof.  The Implementation 
Plan shall continue in force, without any modification in respect of the 
disputed change, until resolution of the matter.

                              (b)  In the event of any conflict between the
terms of the Implementation Plan, on the one hand, and this Assets Purchase
Agreement, the Services Agreement, the License or the Development Agreement, on
the other, the terms of the relevant Transaction Document shall govern and
control over those of the Implementation Plan.  

                    4.2.2     IMPLEMENTATION COMMITTEE.  ActaMed and SBCL shall
form an implementation committee, consisting of an equal number of
representatives of ActaMed and SBCL (the "IMPLEMENTATION COMMITTEE"), authorized
and directed to (i) apply the Implementation Plan to each Region prior to it
being transferred to ActaMed, (ii) oversee, manage and implement the transition
of SBCL Sites into ActaMed Sites in accordance with the Implementation Plan;
(iii) revise and adapt the Implementation Plan to changing circumstances; and 
(iv) determine the steps to be taken by the parties in those instances where the
Implementation Plan does not address an issue or problem presented.  The
Implementation Committee shall initially be comprised of the people named on
SCHEDULE 4.2.2 hereto.  From such list, ActaMed and SBCL shall each designate
one person (each an "RELATIONSHIP MANAGER") who together will manage the
Implementation Committee. 

                    4.2.3     ASSISTANCE FROM SBCL.  SBCL will provide resources
to assist ActaMed in the transition of SBCL Sites to ActaMed Sites as more fully
provided in the Services Agreement.

     SECTION 4.3    GENERAL COVENANTS.

                    4.3.1     ACCESS TO PROPERTIES.  At all times prior to the
last Transfer Date, the Transferred Employees, attorneys, accountants, agents
and other authorized and designated representatives of ActaMed  will be allowed
upon reasonable advance notice and with minimal disruption to SBCL's business
operations, reasonable access to the properties, books and records of SBCL
relating to the SCAN Assets located at SBCL Sites, including without limitation,
title documents, leases, customer lists, and other data that, in the reasonable
opinion of both ActaMed and SBCL, are required for ActaMed to obtain such
information as it may reasonably request about the Transferred Employees or such
SCAN Assets.  ActaMed shall also be allowed reasonable opportunity to consult
with the officers, employees, accountants, counsel and agents of SBCL in
connection with such investigation. 


                                    -27-
<PAGE>

                    4.3.2     OTHER OFFERS AND EXCLUSIVE DEALING.  Unless and
until notice of termination of this Assets Purchase Agreement prior to the last
Transfer Date pursuant to Article X hereof, SBCL shall not, acting in any
capacity, directly or indirectly, through any officer, director, employee,
agent, affiliate or otherwise of SBCL, (a) solicit, initiate or encourage
submission of proposals or offers from any Person, corporation or other entity
for the primary or specific purpose of selling the SCAN Assets located at SBCL
Sites, or relating to the provision of Lab EDI Services to Automated Providers,
(b) participate in any discussions or negotiations regarding, or, except as
required by a legal or judicial process, furnish to any other Person,
corporation or other entity any information with respect to, or otherwise
cooperate in any way with, or assist or participate in, facilitate or encourage,
any effort or attempt by any other Person to purchase the SCAN Assets located at
SBCL Sites or to obtain the right to provide Lab EDI Services to Automated
Providers, or (c) approve or undertake any such transaction.  Nothing in this
Section 4.3.2 shall restrict what SBCL may otherwise do under the Services
Agreement.

                    4.3.3     CONSENTS AND APPROVALS.  SBCL will use its best 
efforts to obtain the waiver, consent and approval of all Persons whose 
waiver, consent or approval (a) is required in order to consummate the 
transactions contemplated by this Assets Purchase Agreement, or (b) is 
required by any Contract to be assumed by ActaMed, or by any Court Order or 
License to which SBCL is a party or subject on any Transfer Date in 
connection with the provision of Lab EDI Services, and which would prohibit, 
or require the waiver, consent or approval of such transactions, or under 
which such transactions would, without such waiver, consent or approval, 
constitute a Default under the provisions thereof, result in the acceleration 
of any obligation thereunder, or give rise to a right of any party thereto to 
terminate its obligations thereunder.  All written waivers, consents and 
approvals obtained by SBCL relating to a Region shall be provided to ActaMed 
on the Transfer Date relating to such Region in form and content reasonably 
satisfactory to ActaMed.  Without limiting the generality of the foregoing, 
SBCL shall cause the [*] to sell to ActaMed in accordance with the terms and 
conditions of this Agreement the SCAN Assets located in Region Two on or 
prior to December 31, 1998.

               To the extent that SBCL's rights under any Contract or other SCAN
Asset to be assigned to ActaMed hereunder may not be assigned without the
consent of another Person which has not been obtained, this Assets Purchase
Agreement shall not constitute an agreement to assign the same if an attempted
assignment would constitute a breach thereof or be unlawful.  If notwithstanding
the best efforts of SBCL described above any such consent shall not be obtained,
or if any attempted assignment would be ineffective or would impair ActaMed's
rights under the SCAN Asset in question so that ActaMed would not in effect
acquire the benefit of all such rights, ActaMed to the maximum extent permitted
by law, shall act after the Applicable Transfer Date as SBCL's agent in order to
obtain for it the benefits thereunder and shall cooperate, to the maximum extent
permitted by law, with SBCL in any other reasonable arrangement designed to
provide such benefits to ActaMed.

                    4.3.4     PUBLIC ANNOUNCEMENTS.  The parties hereto are in
the process of  jointly developing a plan (the "COMMUNICATION PLAN") for
communicating the transactions

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                    -28-
<PAGE>

contemplated by this Assets Purchase Agreement and the Services Agreement to 
Automated Providers, Transferred Employees and the public, a draft of which 
attached as SCHEDULE 4.3.4 hereto.  The parties agree to use their collective 
best efforts to complete the Communication Plan by January 6, 1998, and each 
party agrees to abide by such Communication Plan. Without limiting the 
foregoing, neither party shall send any communication to any Automated 
Providers or Transferred Employee describing, or otherwise in connection 
with, the transactions and relationships contemplated by this Agreement (and 
such other agreements) unless the form and content of such communication 
shall have been approved in advance by the other unless required by law or 
judicial process, in which case notification shall be given to the other 
party hereto prior to such disclosure.

                    4.3.5     STANDSTILL.  At all times prior to the last
Transfer Date, ActaMed shall not consummate, or enter into any agreement with
respect to a Sale of Assets (as that term is defined in the Articles), without
the prior written consent of SBCL.

                              If, at any time prior to the last Transfer 
Date, (i) ActaMed consummates any Merger, Share Exchange or Consolidation (as 
such terms are defined in the Articles) (a "Combination"); (ii) the holders 
of ActaMed stock immediately prior to the Combination are not the holders of 
a majority of the voting stock of the surviving company of the Combination, 
(iii) Michael K. Hoover no longer has (or has diminished) responsibility for 
overseeing and, directly or indirectly, managing the transfer of the Regions 
under Section 2.3, and (iv) the Transfer Date of any remaining Region does 
not occur as scheduled under Section 2.3, then SBCL may withhold [*] of the 
Fixed Fee (as defined in the Services Agreement) due on or after such 
scheduled date or dates until such time as all Regions have been transferred.

     SECTION 4.4    CONFIDENTIALITY OF TRADE SECRETS.  Each party hereto agrees
not to use, copy or disclose the Trade Secrets of the other party, except as
permitted by this Assets Purchase Agreement and the other Transaction Documents.
Each party shall treat the other's Trade Secrets with at least that degree of
care it uses with respect to its own such Trade Secrets.  SBCL will give access
to its Trade Secrets relating to its provision of Lab EDI Services to those
ActaMed personnel who have a need for such access and to no other Person
whatsoever.  ActaMed will give access to its Trade Secrets relating to the
provision of Lab EDI Services to those SBCL personnel who have a need for such
access and to no other Person whatsoever.  The requirements herein contained
with respect to non-disclosure and non-use and protection of each party's Trade
Secrets shall permanently survive termination of any other provisions of this
Assets Purchase Agreement or the other Transaction Documents.  If any party is
ordered by a court, administrative agency, or other governmental body of
competent jurisdiction to disclose Trade Secrets, or if it is served with or
otherwise becomes aware of a motion or similar request that such an order be
issued, then such party will not be liable to the other party for disclosure of
Trade Secrets required by such order if the disclosing party complies with the
following requirements:  (1) if an already issued order calls for immediate
disclosure, then the disclosing party shall immediately move for or otherwise
request a stay of such order to permit the other

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                    -29-
<PAGE>

party to respond; (2) the disclosing party promptly notifies the other party 
of the motion or order; and (3) the disclosing party does not oppose a motion 
or similar request by the other party for an order protecting the Trade 
Secrets including joining or agreeing to (or non-opposition to) a motion for 
leave to intervene by such other party.  Notwithstanding anything to the 
contrary contained in this Assets Purchase Agreement, SBCL may disclose to 
the Office of Inspector General of the Department of Health and Human 
Services (the "OIG") as part of the disclosure SBCL makes under its Integrity 
Agreement the fact that SBCL and ActaMed have entered into the transactions 
contemplated by the parties and any information relating to such transaction 
or this Assets Purchase Agreement which SBCL determines, in good faith upon 
advice of counsel, is required or, in light of SBCL's obligations under the 
Integrity Agreement, appropriate for SBCL to make, or SBCL proposes to make 
in response to a request for such information from the OIG, provided that 
ActaMed shall be given opportunity (which shall be reasonable in light of all 
facts and circumstances) to review and comment upon the information SBCL 
intends to include in any such submission.  In the event that any such 
disclosure that SBCL intends to make includes any information that 
constitutes Trade Secrets of ActaMed, SBCL will provide reasonable (in light 
of all facts and circumstances, including the time frame in which such 
disclosure is required to be made) assistance to ActaMed to take reasonable 
steps to assure that such Trade Secrets of ActaMed are maintained in 
confidence, including, but not limited to, (i) requesting that the OIG treat 
such information as trade secrets within the meaning of the Freedom of 
Information Act, 5 U.S.C. Section 552(b)(4), (ii) requesting of the OIG that 
SBCL and ActaMed be given prior notice of an proposed release of such 
information to Persons or entities outside of the OIG; (iii) requesting that 
the OIG otherwise assure the confidentiality of the information provided by 
ActaMed as if such information was a Trade Secret of SBCL [*] and taking 
other reasonable steps that may be requested by ActaMed and to which SBCL 
may, in its sole discretion, agree to assure that the OIG honors its 
confidentiality obligations in that section; (iv) where such information is 
to be provided in response to a request by the OIG, take reasonable steps to 
narrow the request from the OIG in an appropriate manner in order to limit 
the amount of information, if any, that constitutes Trade Secrets of ActaMed 
covered by such request; and (v) make reasonable efforts to permit ActaMed, 
with the concurrence of the OIG, to disclose such information directly to the 
OIG, provided that in any such case, ActaMed shall give SBCL a timely 
opportunity to review, comment upon and approv the information ActaMed 
intends to include in such submission. The additional safeguards described in 
subsections (i) through (v) above are designed to help assure the 
confidentiality of the Trade Secrets, the disclosure of which would have a 
material adverse impact on ActaMed.  These additional provisions are not 
intended to interfere with SBCL's ability to meet its disclosure obligations 
under the Integrity Agreement.  Each party shall promptly notify the other in 
the event it receives an inquiry, investigation or request for information 
from the OIG or other governmental agency into the matters relating to the 
proposed transactions.  The provisions of this Section 4.4 shall apply in 
addition to similar provisions in the Services Agreement.

     SECTION 4.5    EFFORTS TO SATISFY CONDITIONS.  SBCL and ActaMed each agree
to use their respective best efforts to cause the Transfer Dates to occur as
currently scheduled.  In 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                    -30-

<PAGE>

addition, SBCL agrees to use its best efforts to satisfy the conditions set 
forth in Section 7.1 hereof, and ActaMed agrees to use its best efforts to 
satisfy the conditions set forth in Section 7.2 hereof. In furtherance of the 
foregoing, each party will use its best efforts to take all commercially 
reasonable steps necessary or desirable and proceed diligently and in good 
faith to satisfy each condition to the obligations of the other party 
contained in this Assets Purchase Agreement and will not take or fail to take 
any commercially reasonable action that could reasonably be expected to 
result in the nonfulfillment of any such condition.  Each of ActaMed and SBCL 
further agrees to use its best efforts to (i) satisfy any conditions to the 
transfer of a Region set forth in Section 2.3, and (ii) deliver any and all 
documents to be delivered upon the transfer of a Region, as set forth in 
Sections 2.5 and 2.6.

     SECTION 4.6    EXPENSES.  Except as otherwise provided herein, each of 
the parties to this Assets Purchase Agreement shall bear its respective 
expenses incurred in connection with the preparation, execution and 
performance of this Assets Purchase Agreement and the transactions 
contemplated hereby, including, without limitation, all fees and expenses of 
agents, representatives, counsel and accountants.

     SECTION 4.7    ANTITRUST NOTIFICATION.  The parties have filed with the 
United States Federal Trade Commission and the United States Department of 
Justice the notification and report form required for the transactions 
contemplated hereby and any supplemental or additional information which was 
requested in connection therewith pursuant to the HSR Act.  The filing fee 
relating to such notification and report form will be borne equally.


                                      ARTICLE 5   

                              ACTAMED COVENANTS TO SBCL

     SECTION 5.1    ADDITIONAL COVENANTS OF ACTAMED.  ActaMed covenants and 
agrees that:

                    5.1.1     SECURITIES LAW FILINGS.  From and after 
consummation of a Public Offering and for so long as a Permitted Owner holds 
any Conversion Shares, ActaMed will timely file the reports required to be 
filed by it under the Securities Act and the Exchange Act and the Regulations 
adopted by the SEC thereunder, to the extent required from time to time to 
enable the Permitted Owner to sell Conversion Shares without registration 
under the Securities Act within the limitation of the exemptions provided by 
(a) Rule 144 under the Securities Act, as such rule may be amended from time 
to time, or (b) any similar Regulation hereafter adopted by the SEC.  Upon 
the request of the Permitted Owner, ActaMed will deliver to the Permitted 
Owner a written statement as to whether it has complied with such 
requirements.

                    5.1.2     TRANSACTIONS WITH SUBSTANTIAL HOLDERS.  ActaMed 
shall not, directly or indirectly, knowingly enter into any material 
transaction or agreement with any of its Substantial Holders or any Affiliate 
or officer of ActaMed or a Substantial Holder, or a material 


                                     -31-
<PAGE>

transaction or agreement in which a Substantial Holder or Affiliate or 
officer of ActaMed or a Substantial Holder has a direct or indirect interest, 
unless such transaction or agreement is on terms and conditions no less 
favorable to ActaMed or any of its Subsidiaries than could be obtained at the 
time in an arm's length transaction with a third Person that is not such a 
Substantial Holder or Affiliate or officer of ActaMed or a Substantial 
Holder, and such transaction or agreement has been reviewed and approved by a 
majority of those members of ActaMed's Board of Directors who have no such 
interest in the transaction.  Except as provided in Section 11.1.4, this 
Section shall not be enforceable against ActaMed by (i) any Person other than 
a Permitted Owner or (ii) any Person not a party to this Assets Purchase 
Agreement.

                    5.1.3     BUSINESS AND FINANCIAL COVENANTS.  ActaMed 
covenants that:

                              (a)  Except for shares issued (i) upon exercise 
of options granted in accordance with the Stock Option Plans, the Articles 
and the Stockholders Agreement, (ii) upon conversion of shares of Preferred 
Stock, (iii) in connection with a Public Offering,  (iv) upon exercise of the 
Warrant, or (v) as permitted under the Articles and the Stockholders 
Agreement, ActaMed will not, and will not permit any of its Subsidiaries, to 
hereafter issue or sell any shares or any securities convertible into, or any 
warrants, rights, or options to purchase shares of, the capital stock of 
ActaMed or such Subsidiary to any Person other than ActaMed, and ActaMed will 
not pledge any of the capital stock of any Subsidiary to any Person.  ActaMed 
will not, in any event, issue or sell any shares of Series D Preferred Stock 
to any Person other than SBCL or its Affiliates.

                              (b)  Except as expressly permitted by the 
Articles or the Stockholders Agreement, ActaMed shall not (except for the 
advancement of money for expenses in the ordinary course of business) make, 
or permit any of its Subsidiaries to make, any loans or advances to any 
Person or have outstanding any investment in any Person, whether by way of 
loan or advance to, or by the acquisition of the capital stock, assets or 
obligations of,  or any other interest in, any Person.

                              (c)  Except as expressly permitted herein or by 
the Articles or the Stockholders Agreement, neither ActaMed nor any of its 
Subsidiaries shall declare or make (i) any payment or the incurrence of any 
Liability to make any payment in cash, property or other assets as a dividend 
or other distribution in respect of any shares of capital stock of ActaMed or 
any Subsidiary, excluding, however, any dividends payable to ActaMed by a 
Subsidiary or dividends which may be payable solely in ActaMed Common Stock 
or the common stock of  any Subsidiary and (ii) except as otherwise permitted 
by the Transaction Documents or a stock option agreement under the Stock 
Option Plans, any payment or the incurrence of any Liability to make any 
payment in cash, property or other assets for the purposes of purchasing, 
retiring or redeeming any shares of any class of capital stock of ActaMed or 
any Subsidiary or any warrants, options or other rights to purchase any such 
shares. 

                              (d)  Neither ActaMed nor any of its 
Subsidiaries will amend or change its articles of incorporation or bylaws, or 
violate or breach any of the provisions thereof.


                                     -32-
<PAGE>

                              (e)  Without the consent of a majority of the 
Board of Directors:

                                    (i)      Other than debt in an amount no 
greater than $2,000,000 incurred to fund the cash portion of the Purchase 
Price, ActaMed shall not create, incur or suffer to exist, or permit any 
Subsidiary to create, incur or suffer to exist, any debt other than: (a) debt 
existing on the date hereof and included in the ActaMed Financial Statements 
or incurred in the ordinary course of business between the date of the 
ActaMed Financial Statements and the date hereof, and any renewals or 
replacements of such debt not exceeding the principal amount of the debt 
being replaced or renewed; and (b) debt not in excess of $1,000,000 in the 
aggregate in any one calendar year.

                                    (ii)     ActaMed shall not create or 
suffer to exist, or permit any Subsidiary to create or suffer to exist, any 
obligations for the payment of rent for any property under leases or 
agreements to lease, other than obligations for (a) the payment of rent 
which, in the aggregate, do not exceed $1,000,000 annually and (b) payments 
under leases set forth on DISCLOSURE SCHEDULE 3.2.19.

                                    (iii)    ActaMed shall not acquire, or 
permit any Subsidiary to acquire, directly or indirectly, the assets of or 
equity interests in any other business or entity, whether by purchase, merger 
consolidation or otherwise in excess of $1,000,000.

                                    (iv)     ActaMed shall not effect an 
initial Public Offering of any equity securities, other than equity 
securities issued in a merger, totaling less than $15,000,000 (before 
discounts and commissions) in gross proceeds to ActaMed, and at a per share 
price of less than 2.5 times the then existing conversion price of the Series 
A Preferred Stock.

                    5.1.4     CORPORATE EXISTENCE, BUSINESS, MAINTENANCE, 
INSURANCE.

                              (a)  ActaMed will at all times preserve and 
keep in full force and effect its corporate existence and rights and 
franchises deemed material to its business and those of its Subsidiaries, 
except any Subsidiary of ActaMed may be merged into ActaMed or another 
Subsidiary.

                              (b)  ActaMed shall engage solely in the 
business of developing healthcare information networks (with a principle 
focus on the provision of lab order entry and results reporting services) and 
businesses closely related thereto.  ActaMed (and any Subsidiary) will not 
purchase or acquire any property other than property useful in and related to 
such business.

                              (c)  ActaMed will maintain or cause to be 
maintained in good repair, working order and condition all properties used or 
useful in the business of ActaMed and any Subsidiary and from time to time 
will make or cause to be made all appropriate repairs, 


                                     -33-
<PAGE>

renewals and replacements thereof.  ActaMed and any Subsidiary will at all 
times comply in all material respects with the provisions of all material 
leases to which it is a party or under which it occupies property so as to 
prevent any loss or forfeiture thereof or thereunder.

                              (d)  ActaMed will maintain or cause to be 
maintained, with financially sound and reputable insurers, appropriate 
insurance with respect to its properties and business and the properties and 
business of any Subsidiary against loss or damage.

                    5.1.5     REPURCHASE OF SHARES OF PREFERRED STOCK.  
Except as provided in Article Three, Section 5.1 of the Fourth Amended 
Articles, ActaMed shall not, and shall not permit any of its Subsidiaries or 
any Affiliate of ActaMed to, directly or indirectly, redeem or repurchase or 
make any offer to redeem or repurchase any shares of (i) Preferred Stock 
other than Series D Preferred Stock, unless ActaMed, such Subsidiary or such 
Affiliate has offered to repurchase shares of Preferred Stock PRO RATA, from 
all holders of outstanding shares of Preferred Stock, including without 
limitation the Series D Preferred Stock, upon the same terms, or (ii) Series 
D Preferred Stock unless ActaMed, such Subsidiary or such Affiliate has 
offered to repurchase shares of Series D Preferred Stock PRO RATA, from all 
holders of outstanding shares of Series D Preferred Stock upon the same terms.

                    5.1.6     COMPENSATION.  All awards of compensation, 
including, but not limited to, salary, bonus and awards of stock options made 
to executive officers and/or directors of ActaMed shall be determined by 
ActaMed in accordance with the terms of the Stockholders' Agreement and the 
Articles.

                    5.1.7     SFA AMENDMENT.  ActaMed shall deliver to SBCL, 
within five (5) business days of the Region One Transfer Date, a duly 
executed and delivered Amendment to that certain Amended and Restated 
Development Agreement, dated the 21st day of November, 1996, but effective as 
of the 3rd day of December, 1993, by and between ActaMed and The SFA Limited 
Partnership, which Amendment shall provide, on terms satisfactory to SBCL and 
its counsel, that the SBCL Software, the ActaLab Software and any 
Intellectual Property developed under the Development Agreement shall not 
constitute "ActaMed Technology," as defined in such Amended and Restated 
Development Agreement with The SFA Limited Partnership.

                    5.1.8     NEW BUSINESS PLAN.  Within thirty days after 
the Region One Transfer Date, the Board of Directors of ActaMed will approve 
and adopt a new business plan (the "NEW BUSINESS PLAN") for ActaMed covering 
the years 1998 and 1999, which shall include projected financial data, 
including statements of operations, and operational data, including number of 
sites and transactions per site.  The new business plan shall provide monthly 
data for 1998 and quarterly data for 1999. By June 30, 1999, the Board of 
Directors of ActaMed will approve and adopt an addendum to the plan, covering 
the same items of financial and operational data, for the year 2000, 
presented on a monthly basis.  The nominal values set forth in the New 
Business Plan shall not deviate from analogous figures presented in ActaMed's 
existing business plan, a copy of which was forwarded to SBCL prior to 
December 1, 1997, by more than seven percent (7%).


                                     -34-
<PAGE>

     Section 5.2    INFORMATIONAL COVENANTS OF ACTAMED.  ActaMed covenants 
and agrees that it shall deliver the following information to any Permitted 
Owner for so long as (except as set forth in Section 5.2.6)  such Permitted 
Owner shall hold [*] of the aggregate outstanding shares of Preferred 
Stock or Conversion Shares (considered as a single class) or until such time 
as ActaMed shall have consummated a Public Offering:

                    5.2.1     AUDITED ANNUAL FINANCIAL STATEMENTS.  As soon 
as practicable and, in any case, within one hundred and twenty (120) days 
after the end of each fiscal year, financial statements of ActaMed, 
consisting of the balance sheet of ActaMed as of the end of such fiscal year 
and the statements of operations, statements of stockholders equity and 
statements of cash flows of ActaMed for such fiscal year, setting forth in 
each case, in comparative form, the figures for the preceding fiscal year, 
all in reasonable detail and fairly presented in accordance with GAAP applied 
on a consistent basis throughout the periods reflected therein, except as 
stated therein, and accompanied by an opinion thereon of Ernst & Young, or 
other independent certified public accountants selected by ActaMed of good 
and recognized national standing in the United States.

                    5.2.2     QUARTERLY UNAUDITED FINANCIAL STATEMENTS.  As 
soon as practicable and, in any case, within forty-five (45) days after the 
end of each of the first three fiscal quarters in each fiscal year, unaudited 
financial statements of ActaMed setting forth the balance sheet of ActaMed at 
the end of each such fiscal quarter and the statements of operations and 
statements of cash flows of ActaMed for each such fiscal quarter and for the 
year to date, and setting forth in comparative form figures as of the 
corresponding date and for the corresponding periods of the preceding fiscal 
year, all in reasonable detail and certified by an accounting officer of 
ActaMed as complete and correct, as having been prepared in accordance with 
GAAP consistently applied (except as otherwise disclosed therein) and as 
presenting fairly, in all material respects, the financial position of 
ActaMed and any of its Subsidiaries and results of operations and cash flows 
thereof subject, in each case, to customary exceptions for interim unaudited 
financial statements.

                    5.2.3     MONTHLY UNAUDITED FINANCIAL STATEMENTS.  As 
soon as available, but in any event within thirty (30) days after the end of 
each calendar month, copies of the unaudited balance sheet of ActaMed as at 
the end of such calendar month and the related unaudited statements of 
operations and cash flows for such calendar month and the portion of the 
calendar year through such calendar month, in each case setting forth in 
comparative form the figures for the corresponding periods of (a) the 
previous calendar year and (b) the budget for the current year, prepared in 
reasonable detail and in accordance with GAAP applied consistently throughout 
the periods reflected therein (except as otherwise disclosed therein) and 
certified by the chief financial officer of ActaMed as presenting fairly the 
financial condition and results of operations of ActaMed and any of its 
Subsidiaries (subject to customary exceptions for interim unaudited financial 
statements).

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -35-
<PAGE>

                    5.2.4     MANAGEMENT'S ANALYSIS.  All the financial 
statements delivered pursuant to Sections 5.2.2 and Section 5.2.3 shall be 
accompanied by an informal narrative description of material business and 
financial trends and developments and significant transactions that have 
occurred in the appropriate period or periods covered thereby.

                    5.2.5     BUDGETS.  As soon as practicable, but in any 
event within thirty (30) days prior to the commencement of a fiscal year, an 
annual operating budget for such fiscal year, approved by the Board of 
Directors, including monthly income and cash flow projections and projected 
balance sheets as of the end of each quarter within such fiscal year.  
Extensions of such due date shall not be unreasonably withheld.

                    5.2.6     INSPECTION.  Upon reasonable notice, ActaMed 
shall, and shall cause any of its Subsidiaries to, permit any Permitted Owner 
(so long as it owns [*] or more of the outstanding capital stock of ActaMed) 
by its representatives, agents or attorneys:

                              (a)  to examine all books of account, records, 
reports and other papers of ActaMed or such Subsidiary except to the extent 
that such action would, in the reasonable opinion of counsel, constitute a 
waiver of the attorney/client privilege,

                              (b)  to make copies and take extracts from any 
thereof, except for information which is confidential or proprietary,

                              (c)  to discuss the affairs, finances and 
accounts of ActaMed or such Subsidiary with ActaMed's or such Subsidiary's 
officers and independent certified public accountants (and by this provision 
ActaMed hereby authorizes said accountants to discuss with the Permitted 
Owner and its representatives, agents or attorneys the finances and accounts 
of ActaMed or such Subsidiary), and

                              (d)  to visit and inspect, at reasonable times 
and on reasonable notice during normal business hours, the properties of 
ActaMed and such Subsidiary. 

Notwithstanding any provision herein to the contrary, the provisions of this 
Section 5.2.6 are in addition to any rights of a Permitted Owner under the 
Georgia Business Corporation Code and shall in no way limit such rights.

               The expenses of the Permitted Owner in connection with any 
such inspection shall be for the account of the Permitted Owner.  
Notwithstanding the foregoing sentence, it is understood and agreed by 
ActaMed that all reasonable expenses incurred by ActaMed or such Subsidiary, 
any officers, employees or agents thereof or the independent certified public 
accountants therefor, shall be expenses payable by ActaMed and shall not be 
expenses of the Permitted Owner making the inspection.

               Notwithstanding anything to the contrary, SBCL shall be 
permitted access to any information of, or related to, any customer of 
ActaMed that is a competitor of SBCL only to the 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -36-
<PAGE>

extent ActaMed is not subject to confidentiality undertakings with respect to 
such information; PROVIDED that such limitation shall not prevent SBCL or 
auditors retained by SBCL, or if ActaMed so requires for reasons of 
confidentiality only auditors retained by SBCL, from confirming the amount of 
royalties payable to it under the License Agreement or Services Agreement by 
reason of connectivity between Providers and commercial laboratories other 
than SBCL Labs.

                    5.2.7     OTHER INFORMATION.  ActaMed shall deliver the 
following provided that in the reasonable opinion of counsel to ActaMed such 
disclosure will not constitute a waiver of the attorney/client privilege, the 
breach of any secrecy covenant or the release of information regarding 
competitors of the Permitted Owner:

                              (a)  promptly after the submission thereof to 
ActaMed, copies of any detailed reports (including the auditors' comment 
letter to management, if any such letter is prepared) submitted to ActaMed by 
its independent auditors in connection with each annual or interim audit of 
the accounts of ActaMed made by such accountants;

                              (b)  promptly, and in any event within ten (10) 
days after obtaining knowledge thereof, notice of the institution of any 
suit, action or proceeding (other than a proceeding of general application 
which is not directly against ActaMed or one or more of the Subsidiaries), 
the happening of any event or, to the best knowledge of ActaMed, the 
assertion or threat of any claim against ActaMed or any of the Subsidiaries 
which, either individually or in the aggregate, would have a Material Adverse 
Effect;

                              (c)  promptly upon, and in any event within 
thirty (30) days after obtaining knowledge thereof, notice of any breach of, 
Default under or failure to comply with any material term under this Article 
V or any material adverse change in ActaMed's relationship with its major 
customers, suppliers, employees or other entity with which ActaMed has a 
business relationship;

                              (d)  with reasonable promptness, a notice of 
any default by ActaMed or any of its Subsidiaries under any material 
agreement to which it is a party;

                              (e)  with reasonable promptness, copies of all 
written materials furnished to directors;

                              (f)  promptly (but in any event within ten (10) 
days) after the filing of any document or material with the SEC, a copy of 
such document or material;

                              (g)  promptly after the record date set by the 
Board of Directors to determine the stockholders entitled to vote at 
ActaMed's annual meeting of stockholders (but in any event ten (10) days 
prior to such meeting), a list of all stockholders of ActaMed and their 
respective holdings; and


                                     -37-
<PAGE>

                              (h)  promptly upon request therefor, such other 
data, filings and information as the Permitted Owner may from time to time 
reasonably request.


                                   ARTICLE 6   

                               EMPLOYEE MATTERS


     SECTION 6.1    TERMINATION OF EMPLOYMENT BY SBCL AND OFFER OF EMPLOYMENT 
BY ACTAMED.  Effective as of the close of business on January 1, 1998 or such 
later date as mutually agreed by SBCL and ActaMed, but not later than January 
29, 1998 (the "Termination Date"), SBCL will terminate the employment of the 
individuals listed on Schedule VI.  As soon as practicable following the 
Region One Transfer Date, ActaMed will offer employment to each of the 
individuals listed on Schedule VI, which employment shall become effective as 
of the day following the Termination Date (the "Hire Date").  Each individual 
listed on Schedule VI who accepts ActaMed's offer of employment shall be 
referred to herein as a "Transferred Employee."  In connection with the 
termination of employment of the individuals listed on Schedule VI, SBCL 
shall take such action with respect to compensation and benefits for such 
individuals as described in the SBCL undertakings section of Schedule VI.

     SECTION 6.2    TRANSITIONAL EMPLOYEE LEASING ARRANGEMENT.  For each 
Transferred Employee, the "Transitional Employee Leasing Arrangement" shall 
extend for the period from the Hire Date until the earlier of:

                    6.2.1     the Transfer Date for the Region to which a 
Transferred Employee is assigned; or

                    6.2.2     five business days after the date SBCL provides 
written notice to ActaMed with respect to such Transferred Employee, if SBCL 
determines that it no longer wishes to have a Transferred Employee assigned 
to provide leased services to SBCL pursuant to this Agreement.

During the Transitional Employee Leasing Arrangement period, ActaMed shall 
require, as a condition of the continued employment of each Transferred 
Employee, that each Transferred Employee report to SBCL, and continue to 
comply with SBCL's policies and procedures in the course of each such 
Transferred Employee's employment by ActaMed.  Notwithstanding the foregoing, 
Transferred Employees shall be under ActaMed's supervision, direction and 
control, subject to the general oversight and guidance of SBCL.  In 
performing services for SBCL pursuant to this Article VI, the Transferred 
Employees shall have the status of common law employees of ActaMed, and 
neither the Transferred Employees nor ActaMed shall act as or be employees or 
agents of SBCL.


                                     -38-
<PAGE>

     SECTION 6.3    ACTAMED COMPENSATION AND BENEFITS.  ActaMed shall, out of 
its own funds, provide each Transferred Employee with compensation and 
benefits as set forth on Schedule VI.

     SECTION 6.4    PAST SERVICE CREDIT.  The service of each Transferred 
Employee with SBCL or any of its Affiliates shall be counted for purposes of 
determining eligibility to participate or to vest in benefits under any 
compensation or benefit plan, program or arrangement now or hereafter 
maintained by ActaMed to the same extent that such service was credited or 
otherwise counted under any Benefit Plan in which such Transferred Employee 
was eligible to participate with SBCL immediately prior to the Region One 
Transfer Date.

     SECTION 6.5    TERMINATION OF EMPLOYMENT; NONSOLICITATION; TERMINATION 
OF AGREEMENT.

                    6.5.1     ActaMed will not terminate without cause the 
employment of any Transferred Employee before the date determined under 
Section 6.2.1 or 6.2.2, without the advance written consent of SBCL.

                    6.5.2     ActaMed shall be responsible for assigning 
Transferred Employees to principal work locations, which shall be the same as 
the locations to which such Transferred Employees were assigned as of 
December 31, 1997.  Except as may otherwise be agreed by SBCL and ActaMed in 
a writing signed by the parties, SBCL shall make the business facilities to 
which Transferred Employees are currently assigned available to ActaMed for 
the purpose of location assignments of Transferred Employees until not later 
than the [*] anniversary of the Transfer Date of the Region to which a 
Transferred Employee is assigned.

                    6.5.3     SBCL shall not solicit the employment of, hire 
or employ any Transferred Employee until after the earlier of (i) such 
Transferred Employee's termination of employment by ActaMed with cause, (ii) 
such Transferred Employee's voluntary resignation from ActaMed, [*] (iii) [*] 
or (iv) the termination of this Assets Purchase Agreement pursuant to Section 
10.1, in which event ActaMed shall, at SBCL's request, use its best efforts 
to cooperate with SBCL in facilitating SBCL's solicitation to re-hire such 
Transferred Employees.

     SECTION 6.6    PAYMENT OF WAGE AND BENEFIT COSTS.

                    6.6.1     PERIOD FROM JANUARY 1, 1998 THROUGH THE HIRE 
DATE. For the period beginning January 1, 1998 and extending through the Hire 
Date, with respect to each individual identified on SCHEDULE VI as a 
Transferred Employee, ActaMed shall reimburse SBCL for such individuals' base 
salary, paid time off, the employer-paid portion of employment and 
unemployment insurance or taxes, the employer-paid portion of premiums 
payable with respect to all insured benefits, with respect to medical and 
dental benefits for individuals who participate in the self-insured medical 
and dental program sponsored by SBCL, the pro rated portion of the excess, if 
any, of a reasonable premium cost for such coverage, as determined by 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -39-
<PAGE>

SBCL, over the amount paid by such individual for such coverage, the present 
value of additional accruals under the SmithKline Beecham Pension Plan, as 
determined by the Plan's actuary and employer contributions payable under the 
SmithKline Beecham Retirement Savings Plan. SBCL will bill such employee 
costs to ActaMed by or before January 31, 1998, and ActaMed will remit 
payment to SBCL for such employee costs within 30 days of receipt of the bill 
for such costs.

                    6.6.2     DURING TRANSITION.  Except as otherwise 
provided in SCHEDULE VI, SBCL will reimburse ActaMed for certain direct 
compensation and benefit costs incurred by ActaMed with respect to each 
Transferred Employee during the Transitional Employee Leasing Arrangement 
period (as hereinafter defined, the "Employee Costs").  For purposes of this 
Article VI, Employee Costs will include base salary, paid time off pursuant 
to the paid time off policy described in SCHEDULE VI, the employer-paid 
portion of employment and unemployment insurance or taxes, the employer-paid 
portion of premiums payable with respect to the insured benefits set forth on 
SCHEDULE VI, employer contributions made under any ActaMed qualified defined 
contribution plan, and with respect to short term disability benefits for 
individuals who participate in the self-insured short term disability plan 
sponsored by ActaMed, the pro rated portion of the excess, if any, of a 
reasonable premium cost for such coverage, as determined by ActaMed, over the 
amount paid by such individual for such coverage. In addition, for each 
Transferred Employee, for each of 1998 and 1999, Employee Costs will include 
an amount equal to [*] of [*] to such Transferred Employee [*], the [*] is 
the [*] during which such Transferred Employee was [*], and the [*].  ActaMed 
will bill such Employee Costs to SBCL monthly, and SBCL will remit payment to 
ActaMed for such Employee Costs within 30 days of receipt of the bill for 
such costs.  

                    6.6.3     STAY BONUS AND BONUS.

                              (a)  Stay Bonus.  SBCL will reimburse ActaMed 
for [*] of the stay bonus payments described in SCHEDULE VI and actually made 
by ActaMed within thirty (30) days following SBCL's receipt of the bill for 
such costs.

                              (b)  Bonus.  ActaMed will pay, and SBCL will 
reimburse ActaMed for, bonus payments as described in the bonus provisions of 
SCHEDULE VI.

     SECTION 6.7    TAXES, UNEMPLOYMENT INSURANCE AND RELATED ITEMS.  ActaMed 
agrees to accept and hereby accepts full and exclusive responsibility for the 
payment of any and all contributions or taxes, or both, for any unemployment 
insurance or taxes, medical and old age retirement benefits, pensions or 
annuities now or hereafter imposed under any law of the United States or any 
State, which are measured by the wages, salaries or other remuneration paid 
to persons employed by ActaMed on the work covered by this Article VI or in 
any way connected 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -40-
<PAGE>

therewith; and ActaMed shall reimburse SBCL for any of the contributions or 
taxes, or both, or any part thereof, if SBCL may be required by law to pay 
the same or any part thereof.

     SECTION 6.8    EXAMINATION AND AUDIT.  For the Transitional Employee
Leasing Arrangement period, and for three calendar years after final payment is
made to ActaMed by SBCL pursuant to Section 6.6, ActaMed shall establish and
maintain relevant books, records, payroll records, receipts, documents, papers
and any other data or information which support and substantiate the charges
made to and payments received from SBCL under Section 6.2.  During such time,
SBCL or its designated representative shall have access to and the right to
examine any relevant books, records, documents, papers, receipts and any other
data or information of ActaMed relating to ActaMed's obligations under this
Article VI.

                                      ARTICLE 7   

                    CONDITIONS PRECEDENT TO OBLIGATIONS OF ACTAMED

     SECTION 7.1    CONDITIONS PRECEDENT TO OBLIGATIONS OF ACTAMED.  The
obligations of ActaMed to consummate the transactions contemplated by this
Assets Purchase Agreement shall be subject to the satisfaction, on or before the
Applicable Transfer Date, of each and every one of the following conditions, all
or any of which may be waived, in whole or in part, by ActaMed for purposes of
consummating such transactions, but without prejudice to any other right or
remedy which ActaMed may have hereunder as a result of any misrepresentation by,
or breach of any agreement, covenant or warranty of SBCL contained in this
Assets Purchase Agreement or any Schedule, certificate or instrument furnished
or caused to be furnished by SBCL hereunder.

                    7.1.1     REPRESENTATIONS TRUE. The representations and 
warranties made by SBCL in this Assets Purchase Agreement, with any 
exceptions set forth in the Disclosure Schedules attached to the Compliance 
Certificate, shall be true and correct in all material respects on the 
Applicable Transfer Date, with the same force and effect as if such 
representations and warranties had been made on and as of such Applicable 
Transfer Date.  The Disclosure Schedules shall not identify any item 
indicating that the business or financial condition of SBCL or SBCL's 
provision of or ability to provide Lab EDI Services to SBCL Sites has been 
materially and adversely impacted, or which would impair SBCL's ability to 
perform its obligations hereunder, including its ability to deliver the SCAN 
Assets to ActaMed.

                    7.1.2     COVENANTS.  All of the terms, covenants and
conditions in this Assets Purchase Agreement and the other SBCL Documents to be
complied with or performed by SBCL on or prior to the Region One Transfer Date
shall have been complied with and performed in all material respects.

                    7.1.3     NO INJUNCTION, ETC.  No action, proceeding,
investigation or Regulation shall have been instituted, threatened or proposed
before any court, governmental 


                                      -41-
<PAGE>

agency or legislative body to enjoin, restrain, prohibit, or obtain 
substantial damages in respect of, or which is related to, or arises out of, 
this Assets Purchase Agreement or the consummation of the transactions 
contemplated hereby, or which is related to or arises out of the provision of 
Lab EDI Services, if such action, proceeding, investigation or Regulation, in 
the reasonable judgment of ActaMed, would make it inadvisable to consummate 
the transactions contemplated on such Transfer Date.

                    7.1.4     APPROVAL OF LEGAL MATTERS.  All actions,
proceedings, instruments and documents deemed necessary or appropriate by
ActaMed or their counsel to effectuate this Assets Purchase Agreement and the
consummation of the transactions contemplated hereby, or incidental thereto, and
all other related legal matters, shall have been approved by such counsel. 

                    7.1.5     GOVERNMENTAL APPROVALS.  All governmental and
other consents and approvals, if any, necessary to permit the consummation of
the transactions contemplated by this Assets Purchase Agreement on such Transfer
Date shall have been received by ActaMed.

     SECTION 7.2    CONDITIONS PRECEDENT TO THE OBLIGATIONS OF SBCL.  The
obligations of SBCL to consummate the transactions contemplated by this Assets
Purchase Agreement shall be subject to the satisfaction, on or before each
Transfer Date, of each and every one of the following conditions, all or any of
which may be waived, in whole or in part, by SBCL for purposes of consummating
such transactions, but without prejudice to any other right or remedy which SBCL
may have hereunder as a result of any misrepresentation by, or breach of any
agreement, covenant or warranty of ActaMed contained in this Assets Purchase
Agreement, or any certificate or instrument furnished by it hereunder.

                    7.2.1     REPRESENTATIONS TRUE.  The representations and
warranties made by ActaMed in this Assets Purchase Agreement, with any
exceptions set forth in the Disclosure Schedules attached to the Compliance
Certificate, shall be true and correct in all material respects on the
Applicable Transfer Date, with the same force and effect as if such
representations and warranties had been made on and as of such Applicable
Transfer Date.  The Disclosure Schedules shall not identify any item indicating
that the business or financial condition of ActaMed has been materially and
adversely impacted, or which would impair ActaMed's ability to perform its
obligations hereunder.

                    7.2.2     COVENANTS.  All of the terms, covenants and
conditions in the ActaMed Documents to be complied with or performed by ActaMed
on or prior to the Transfer Date shall have been complied with and performed in
all material respects.

                    7.2.3     NO INJUNCTION, ETC.  No action, proceeding,
investigation or Regulation shall have been instituted, threatened or proposed
before any court, governmental agency or legislative body to enjoin, restrain,
prohibit, or obtain substantial damages in respect of, or which is related to,
or arises out of, this Assets Purchase Agreement or the consummation of the
transactions contemplated hereby, or which is related to or arises out of the
business of ActaMed, if such action, proceeding, investigation or Regulation, in
the reasonable judgment of 


                                     -42-
<PAGE>

SBCL, would make it inadvisable to consummate the transactions contemplated 
on such Transfer Date.

                    7.2.4     APPROVAL OF LEGAL MATTERS.  All actions,
proceedings, instruments and documents deemed necessary or appropriate by SBCL
or its counsel to effectuate this Assets Purchase Agreement and the consummation
of the transactions contemplated hereby, or incidental hereto, and all other
related legal matters, shall have been approved by such counsel.

                    7.2.5     GOVERNMENTAL APPROVALS.  All governmental and
other consents and approvals, if any, necessary to permit the consummation of
the transactions contemplated by this Assets Purchase Agreement shall have been
received by SBCL.

                                      ARTICLE 8   

                SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS

                                 AND INDEMNIFICATION

     SECTION 8.1    SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS.

                    8.1.1     SURVIVAL OF SBCL REPRESENTATIONS, WARRANTIES 
AND COVENANTS. ActaMed and SBCL acknowledge and agree that, as contemplated 
by Section 4.3.1, prior to each of the Transfer Dates, ActaMed intends to 
perform such investigation of the SCAN Assets to be transferred on such 
Transfer Date and related Lab EDI Services provided by SBCL as ActaMed may 
deem appropriate; PROVIDED, HOWEVER, no investigation by ActaMed shall 
diminish or otherwise affect any of the representations, warranties, 
covenants or agreements made or to be performed by SBCL pursuant to this 
Assets Purchase Agreement or ActaMed's right to rely fully upon such 
representations, warranties, covenants and agreements.  All such 
representations, warranties, covenants and agreements made or to be performed 
by SBCL pursuant to this Assets Purchase Agreement shall survive the 
execution and delivery hereof and each of the Transfer Dates hereunder 
indefinitely except to the extent limited by this Section 8.1.1.  The 
representations and warranties shall terminate and expire, (a) with respect 
to any General Claim based on a breach thereof (other than one based on a 
breach of Section 3.1.3 hereof) with respect to which a Claims Notice has not 
been given, after [*] from the Transfer Date of the SCAN Assets as to which 
the representation and warranty was made, (b) with respect to any General 
Claim based upon a breach of Section 3.1.3 hereof, after the earlier of (i) 
[*] or (ii) [*] days after the Region Four Transfer Date, and (c) with 
respect to a Tax Claim, on the later of (i) the [*] after the date upon which 
the Liability to which any such Tax Claim may relate is barred by all 
applicable statutes of limitation and (ii) the [*] after the date upon which 
any claim for refund or credit related to such Tax Claim is barred by all 
applicable statutes of limitation.  A Claims Notice for a General Claim based 
on a breach of covenant may be given at any time up to the [*] of the date on 
which the breach of such covenant occurred.  With respect to any Ownership 
Claim, Undisclosed Liability Claim or any type of claim not specifically 
addressed

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -43-
<PAGE>

above, such representations, warranties, covenants and agreements shall 
survive without limit of time.

                    8.1.2     SURVIVAL OF ACTAMED REPRESENTATIONS, WARRANTIES 
AND COVENANTS. All the representations, warranties, covenants and agreements, 
made or to be performed by ActaMed  pursuant to this Assets Purchase 
Agreement shall survive the execution and delivery hereof indefinitely except 
to the extent limited by this Section 8.1.2.   No investigation by SBCL shall 
diminish or otherwise affect any of the representations, warranties, 
covenants or agreements made or to be performed by ActaMed pursuant to this 
Assets Purchase Agreement or SBCL's right to rely fully upon such 
representations, warranties, covenants and agreements.  All such 
representations, warranties, covenants and agreements shall be considered to 
have been relied upon by SBCL and shall survive the delivery to SBCL of the 
shares of Series D Preferred Stock (and the Conversion Shares).  The 
representations and warranties shall terminate and expire (a) with respect to 
a General Claim based on a breach thereof for which a Claims Notice has not 
been given, after [*] from the Transfer Date with respect to which such 
representation and warranty was made, (b) with respect to a Tax Claim, on the 
later of (i) the [*] after the date upon which the Liability to which any 
such Tax Claim may relate is barred by all applicable statutes of limitation 
and (ii) the [*] after the date upon which any claim for refund or credit 
related to such Tax Claim is barred by all applicable statutes of limitation 
and (c) with respect to the covenants of ActaMed set forth in Sections 5.1.3 
and 5.1.6 hereof, upon the closing of a Public Offering.  A Claims Notice for 
a General Claim based on a breach of covenant may be given at any time up to 
the [*] of the date on which the breach of such covenant occurred.  With 
respect to any Ownership Claim, Undisclosed Liability Claim or any type of 
claim not specifically addressed above, such representations, warranties, 
covenants and agreements shall survive without limit of time.

     SECTION 8.2    OBLIGATION TO INDEMNIFY.

                    8.2.1     OBLIGATIONS OF SBCL TO INDEMNIFY.  Subject to the
limitations of Sections 8.1.1, 8.2.6 and 8.2.9, SBCL agrees to indemnify and
hold harmless each ActaMed Indemnitee against and in respect of:

                              (a)  all Losses imposed upon or incurred by any
ActaMed Indemnitee by reason of or resulting from:

                                   (i)    a breach of any representation or
warranty of  SBCL contained in or made pursuant to this Assets Purchase
Agreement other than the representation contained in Section 3.1.3(a); or 

                                   (ii)   any nonfulfillment of any covenant or
agreement of SBCL contained in or made pursuant to this Assets Purchase
Agreement; or

                                   (iii)  any Liability of SBCL not assumed by
ActaMed hereunder, including without limitation any Liability for any Taxes
attributable to ownership of 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -44-
<PAGE>

SCAN Assets or SBCL's provision of Lab EDI Services in a Region prior to its 
Transfer Date in accordance herewith. 

                              (b)  any and all actions, suits, claims,
proceedings, investigations, demands, assessments, audits, fines, judgments,
costs and other expenses (including, without limitation, reasonable legal fees
and expenses) incident to any Loss in connection with Section 8.2.1(a) or to the
enforcement of this Section 8.2.1; 

                              (c)  all Losses imposed upon or incurred by any
ActaMed Indemnitee by reason of or resulting from any Litigation pending or
threatened, arising out of or relating to the provision of Lab EDI Services at
an SBCL Site hereunder, regardless of whether it is disclosed in any Section of
the Disclosure Schedule called for by Section 3.1 or Section 2.5.2 hereof;
PROVIDED, HOWEVER that, to the extent that any such Loss arises out of the
actions of a Transferred Employee, SBCL shall only be obligated to indemnify and
hold harmless an ActaMed Indemnitee hereunder if such Transferred Employee was
acting subject to SBCL's general oversight and guidance pursuant to Section 6.2
hereof.

                    8.2.2     OBLIGATION OF ACTAMED TO INDEMNIFY.  Subject to
the limitations of Section 8.1.2 and Section 8.2.6, ActaMed agrees to indemnify
and hold harmless each SBCL Indemnitee against and in respect of:

                              (a)  all Losses imposed upon or incurred by any
SBCL Indemnitee by reason of or resulting from:

                                   (i)    a breach of any representation or
warranty of ActaMed contained in or made pursuant to this Assets Purchase
Agreement; or 

                                   (ii)   any nonfulfillment of any covenant or
agreement of ActaMed contained in or made pursuant to this Assets Purchase
Agreement; and

                                   (iii)  any Liability of ActaMed (other than
a Liability indemnified by SBCL pursuant to Section 8.2.1) attributable to
ownership of SCAN Assets or ActaMed's provision of Lab EDI Services in a Region
after its Transfer Date in accordance herewith; PROVIDED that if the Services
Agreement provides for indemnification for any such Liability, then no such
claim shall be brought hereunder. 

                              (b)  any and all actions, suits, claims,
proceedings, investigations, demands, assessments, audits, fines, judgments,
costs and other expenses (including, without limitation, reasonable legal fees
and expenses) incident to any Loss in connection with Section 8.2.2(a) or to the
enforcement of this Section 8.2.2.

                              (c)  all Losses imposed upon or incurred by any
SBCL Indemnitee by reason of or resulting from any Litigation pending or
threatened, arising out of or relating to use of SCAN Assets at an ActaMed Site


                                     -45-
<PAGE>

after such site became an ActaMed Site hereunder, regardless of whether it is 
disclosed in the Disclosure Schedule by reason of Section 3.2 or Section 
2.6.3 hereof.

                              (d)  all Losses imposed upon or incurred by SBCL
by reason of SBCL premises being used by Transferred Employees on or after the
Hire Date.

                    8.2.3     CLAIMS NOTICE.  A Claim shall be made by any
Indemnitee by delivery of a Claims Notice to the Indemnifying Party requesting
indemnification and specifying the basis on which indemnification is sought and
the amount of asserted Losses and, in the case of a Third Party Claim,
containing (by attachment or otherwise) such other information as such
Indemnitee shall have concerning such Third Party Claim.  

                    8.2.4     PROCEDURES INVOLVING NON-THIRD PARTY CLAIMS.  If
the Claim involves a matter other than a Third Party Claim, the Indemnifying
Party shall have forty-five (45) days to object to such Claim by delivery of a
written notice of such objection to such Indemnitee specifying in reasonable
detail the basis for such objection.  If an objection is timely made by the
Indemnifying Party, the Indemnifying Party and the Indemnitee shall cooperate in
the compromise of the Claim with ultimate resolution of the validity of such
Claim to be determined under Article IX.  Failure to object in a timely manner
shall constitute a final and binding acceptance of the Claim by the Indemnifying
Party on behalf of all Indemnitors, and the Claim shall be paid in accordance
with Section 8.2.8 hereof.

                    8.2.5     PROCEDURES INVOLVING THIRD PARTY CLAIMS.  The
obligations and liabilities of the parties hereunder with respect to a Third
Party Claim shall be subject to the following terms and conditions:

                              (a)  The Indemnitee shall give the Indemnifying
Party written notice of a Third Party Claim promptly after receipt by the
Indemnitee of notice thereof, and the Indemnifying Party may undertake the
defense, compromise and settlement thereof by representatives of its own
choosing reasonably acceptable to the Indemnitee.  The failure of the Indemnitee
to notify the Indemnifying Party of such claim shall not relieve the
Indemnifying Party of any liability that it may have with respect to such claim
except to the extent the Indemnifying Party demonstrates that the defense of
such claim is prejudiced by such failure.  The assumption of the defense,
compromise and settlement of any such Third Party Claim by the Indemnifying
Party shall be an acknowledgment of the obligation of the Indemnifying Party to
indemnify the Indemnitee with respect to such claim hereunder.  If the
Indemnitee desires to participate in, but not control, any such defense,
compromise and settlement, it may do so at its sole cost and expense.  If,
however, the Indemnifying Party fails or refuses to undertake the defense of
such Third Party Claim within ten (10) days after written notice of such claim
has been given to the Indemnifying Party by the Indemnitee, the Indemnitee shall
have the right to undertake the defense, compromise and settlement of such claim
with counsel of its own choosing. In the circumstances described in the
preceding sentence, the Indemnitee shall, promptly upon its assumption of the
defense of such claim, make a Claim as specified in 


                                      -46-
<PAGE>

Section 8.2.1(b) or 8.2.2(b) which shall be deemed a Claim that is not a 
Third Party Claim for the purposes of the procedures set forth herein.

                              (b)  If, in the reasonable opinion of the
Indemnitee, any Third Party Claim or the litigation or resolution thereof
involves an issue or matter which could have a material adverse effect on the
business, operations, assets, properties or prospects of the Indemnitee
(including, without limitation, the administration of the tax returns and
responsibilities under the tax laws of the Indemnitee), the Indemnitee shall
have the right to control the defense, compromise and settlement of such Third
Party Claim undertaken by the Indemnifying Party, and the reasonable costs and
expenses of the Indemnitee in connection therewith shall be included as part of
the indemnification obligations of the Indemnifying Party hereunder.  If the
Indemnitee shall elect to exercise such right, the Indemnifying Party shall have
the right to participate in, but not control, the defense, compromise and
settlement of such Third Party Claim at its sole cost and expense.

                              (c)  No settlement of a Third Party Claim
involving the asserted liability of the Indemnifying Party under this Article
shall be made without the prior written consent by or on behalf of the
Indemnifying Party, which consent shall not be unreasonably withheld or delayed.
If the Indemnifying Party assumes the defense of such a Third Party Claim, (1)
no compromise or settlement thereof may be effected by the Indemnifying Party
without the Indemnitee's consent unless (a) there is no finding or admission of
any violation of law or any violation of the rights of any Person and no effect
on any other claim that may be made against the Indemnitee (b) the sole relief
provided is monetary damages that are paid in full by the Indemnifying Party and
(c) the compromise or settlement includes, as an unconditional term thereof, the
giving by the claimant or the plaintiff to the Indemnitee of a release, in form
and substance reasonably satisfactory to the Indemnitee, from all liability in
respect of such Third Party Claim, and (2) the Indemnitee shall have no
liability with respect to any compromise or settlement thereof effected without
its consent.

                    8.2.6     LIMITATIONS ON INDEMNIFICATION.

                              (a)  No Party to this Assets Purchase Agreement
shall be entitled to indemnification under this Assets Purchase Agreement to the
extent that such Party's Losses are increased or extended by the willful
misconduct, violation of law or bad faith of such Party.

                              (b)  No Indemnifying Party shall be required to 
indemnify an Indemnitee with respect to any Loss arising out of or with 
respect to a Claim unless the amount of such Loss, when aggregated with all 
other such Losses, shall (i) exceed [*], at which time Claims may be asserted 
to the extent that all Losses or Asserted Liabilities are in excess of such 
threshold amount; PROVIDED, however, that such threshold amount shall not 
apply to any (a) Loss which results from or arises out of an Ownership Claim, 
a Tax Claim or Undisclosed Liability Claim, (b) Loss which results from or 
arises out of fraud or intentional misrepresentation or an intentional breach 
of a representation, 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -47-
<PAGE>

warranty, covenant or agreement in this Assets Purchase Agreement; (c) Claim 
which is based upon Section 8.2.1(a)(iii) or 8.2.2(a)(iii) or (d) Loss which 
results from or arises out of any Litigation incident to any of the matters 
referred to in the foregoing clauses (a) and (b); and (ii) be less than [*], 
PROVIDED that such cap shall not apply to (a) a General Claim which is based 
upon a breach by SBCL of its representations and warranties set forth in 
Sections 3.1.7(a) or (b) hereof or a breach of its covenant set forth in 
Section 4.4 hereof, (b) a General Claim which is based upon a breach by 
ActaMed of its representation and warranty set forth in Section 3.2.14 or a 
breach of its covenant set forth in Section 4.4 hereof, or (c) a Claim which 
is based upon Section 8.2.1(a)(iii) or 8.2.2(a)(iii).  Notwithstanding the 
foregoing, for any breach of Section 3.1.6(a)-(c), SBCL shall indemnify each 
ActaMed Indemnitee for any individual Loss in excess of [*] per item of 
tangible personal property and any aggregate Loss exceeding [*] for items of 
tangible personal property. 

                    8.2.7     NO RELEASE FOR FRAUD.  Nothing contained in this
Assets Purchase Agreement shall relieve or limit the liability of any Party or
any officer or director of such Party from any Liability arising out of or
resulting from common law fraud or intentional misrepresentation in connection
with the transactions contemplated by this Assets Purchase Agreement or in
connection with the delivery of any of the Transaction Documents.  Each Party
shall have a right to indemnification for any Loss incurred as the result of any
common law fraud or intentional misrepresentation by any other Party or any
officer or director of such other Party without regard to the Threshold Amount,
the maximum liability or any period of limitation.

                    8.2.8     PAYMENT.

                              (a)  If any Party is required to make any payment
under this Article, such Party shall promptly pay the Indemnified Party the
amount so determined.  If there is a dispute as to the amount or manner of
determination of any indemnity obligation owed under this Article, the
Indemnifying Party shall nevertheless pay when due such portion, if any, of the
obligation as shall not be subject to dispute.  The difference, if any, between
the amount of the obligation ultimately determined as properly payable under
this Article and the portion, if any, theretofore paid shall bear interest as
provided in Section 8.2.8(c).

                              (b)  Any items as to which an Indemnified Party is
entitled to payment under this Article may be paid by set-off against amounts
payable to the Indemnifying Party to the extent that such amounts are sufficient
to pay such items.

                              (c)  If all or part of any indemnification
obligation under this Assets Purchase Agreement is not paid when due, then the
Indemnifying Party shall pay the Indemnified Party interest on the unpaid
principal amount of the obligation from the date the amount became due until
payment in full, at the per annum rate of interest announced from time to time
by NationsBank South, N.A., to be its "prime rate."

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -48-
<PAGE>

                    8.2.9   SPECIAL INDEMNITY AS TO PROJECTIONS. 
Notwithstanding Section 8.2.6(b), SBCL shall pay to ActaMed any amount by 
which (x) the aggregate general expenses incurred by ActaMed for goods and 
services reflected on SCHEDULE 3.1.3 under the Subtotals [*] in connection 
with ActaMed's provision of Lab EDI Services to the Fixed Fee Sites (as 
defined in the Services Agreement), taking into account that the Projections 
are based on [*] SCAN Sites, the number of SCAN Sites actually transferred to 
ActaMed and the staging of their transfer, excluding one-time or 
transactional expenses (which amount shall include any expenses incurred with 
respect to this transaction), and less any increased expenses incurred as a 
result of providing the Agreed Services (as defined in the Services 
Agreement) in a different manner than SBCL did prior to the transfer of such 
SCAN Sites exceeds (y) [*] of the Projections.

                    8.2.10  EXCLUSIVE REMEDY.  Except for equitable remedies 
and any action for common law fraud, the remedies provided in this Article 
constitute the sole and exclusive remedies for recovery against the 
Indemnifying Party based upon this Assets Purchase Agreement.

                                  ARTICLE 9

                              DISPUTE RESOLUTION

     SECTION 9.1  INFORMAL DISPUTE RESOLUTION.  Any dispute between the 
parties arising out of or with respect to this Assets Purchase Agreement, 
either with respect to the interpretation of any provision of this Assets 
Purchase Agreement or with respect to the performance by ActaMed or SBCL, 
shall be resolved as provided in this Article.

                    9.1.1   INFORMAL DISPUTE RESOLUTION.  Prior to the 
initiation of formal dispute resolution procedures, the parties shall first 
attempt to resolve their dispute informally, as follows:

                             (a)  The Relationship Managers for each Party 
shall meet for the purpose of endeavoring to resolve such dispute.  They 
shall meet as often as the parties reasonably deem necessary in order to 
gather and furnish to the other all information with respect to the matter in 
issue which the parties believe to be appropriate and germane in connection 
with its resolution.  The Relationship Managers shall discuss the problem and 
negotiate in good faith in an effort to resolve the dispute without the 
necessity of any formal proceeding.  During the course of negotiations, all 
reasonable requests made by one Party to another for nonprivileged 
information, reasonably related to this Assets Purchase Agreement, shall be 
honored in order that each of the parties may be fully advised of the other's 
position.

                             (b)  If, within fifteen (15) days after a matter 
has been identified for resolution pursuant to this Article, either of the 
Relationship Managers concludes in good faith that amicable resolution 
through continued negotiation in this forum does not appear likely, 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                     -49-
<PAGE>

the matter will be escalated by formal written notification to the SBCL 
President and the ActaMed President.  The Parties will use their respective 
best efforts to cause the SBCL President and the ActaMed President to meet to 
attempt to resolve the dispute.

                             (c)  Formal proceedings for the resolution of a 
dispute may not be commenced until the earlier of: (i) the date on which the 
SBCL President and the ActaMed President conclude in good faith that amicable 
resolution through continued negotiation of the matter does not appear 
likely; or (ii) thirty (30) days after the dispute has been referred to the 
SBCL President and the ActaMed President.

                    9.1.2  FORMAL PROCEEDINGS PERMITTED.  The provisions of 
this Section 9.1 shall not be construed to prevent a party from instituting, 
and a party being authorized to institute, formal proceedings earlier to 
avoid the expiration of any applicable limitations period or any period 
provided for in Section 8.1.

     SECTION 9.2  ARBITRATION.  If the parties are unable to resolve any 
controversy arising under this Assets Purchase Agreement as contemplated by 
Section 9.1 and if such controversy is not subject to Article VIII or Section 
9.3, then such controversy shall be submitted to mandatory and binding 
arbitration at the election of either party (the "Disputing Party") pursuant 
to the following conditions:

                    9.2.1  SELECTION AND REPLACEMENT OF ARBITRATORS.  The 
Disputing Party shall notify the AAA and the other party in writing 
describing in reasonable detail the nature of the dispute (the "DISPUTE 
NOTICE").  Each of the parties shall select a neutral arbitrator in 
accordance with the rules of AAA, and the two arbitrators so selected shall 
select a third neutral arbitrator (the three arbitrators referred to in this 
Section being hereinafter referred to as the "PANEL").

                    9.2.2  CONDUCT OF ARBITRATION.  The Panel shall allow 
reasonable discovery as permitted by the Federal Rules of Civil Procedure, to 
the extent consistent with the purpose of the arbitration.  The panel shall 
have no power or authority to amend or disregard any provision of this 
Section.  The arbitration hearing shall be commenced promptly and conducted 
expeditiously, with each of ActaMed and SBCL being allocated one-half of the 
time for the presentation of its case.  Unless otherwise agreed to by the 
parties, an arbitration hearing shall be conducted on consecutive days.

                    9.2.3  REPLACEMENT OF ARBITRATOR.  Should an arbitrator 
refuse or be unable to proceed with arbitration proceedings as called for by 
this Section, such arbitrator shall be replaced by an arbitrator selected in 
accordance with the rules of the AAA.

                    9.2.4  FINDINGS AND CONCLUSIONS.  The Panel rendering 
judgment upon disputes between parties as provided in this Section shall, 
after reaching judgment and award, prepare and distribute to the parties a 
writing describing the findings of fact and conclusions of law relevant to 
such judgment and award and containing an opinion setting forth the reasons 
for 

                                     -50-
<PAGE>

the giving or denial of any award.  The award of the Panel shall be final and 
binding on the parties, and judgment thereon may be entered in a court of 
competent jurisdiction.

                    9.2.5  PLACE OF ARBITRATION HEARINGS.  Arbitration 
hearings hereunder shall be held in Washington, D.C.

                    9.2.6  TIME OF THE ESSENCE.  The Panel is instructed that 
time is of the essence in the arbitration proceeding.  The Panel shall render 
its judgment or award within fifteen (15) days following the conclusion of 
the hearing.  Recognizing the express desire of the parties for an 
expeditious means of dispute resolution, the Panel shall limit or allow the 
parties to expand the scope of discovery as may be reasonable under the 
circumstances.

     SECTION 9.3  LITIGATION.

                    9.3.1  IMMEDIATE INJUNCTIVE RELIEF.  In the event of a 
breach of the confidentiality obligations set forth in this Assets Purchase 
Agreement, or in the event a party makes a good faith determination that a 
breach of the terms of this Assets Purchase Agreement by the other party is 
such that the damages to such party resulting from the breach will be so 
immediate, so large or severe, and so incapable of adequate redress after the 
fact that a temporary restraining order or other immediate injunctive relief 
is a necessary remedy, then such party may file a pleading with a court 
seeking immediate injunctive relief.  If a party files a pleading with a 
court seeking immediate injunctive relief and this pleading is challenged by 
the other party and the injunctive relief sought is not awarded in 
substantial part (or in the event of a temporary restraining order is vacated 
upon challenge by the other party), the party filing the pleading seeking 
immediate injunctive relief shall pay all of the costs and attorneys' fees of 
the party successfully challenging the pleading.

                    9.3.2  JURISDICTION.  ActaMed and SBCL each consent to 
venue in Philadelphia, Pennsylvania and to the nonexclusive jurisdiction of 
competent Pennsylvania state courts or federal courts located in Philadelphia 
for all litigation which may be brought, subject to the requirement for 
arbitration hereunder, with respect to the terms of, and the transactions and 
relationships contemplated by, this Assets Purchase Agreement. 

                                  ARTICLE 10

                                 TERMINATION

     SECTION 10.1  TERMINATION.

                    10.1.1  METHOD OF TERMINATION.  This Assets Purchase 
Agreement and the transactions contemplated hereby may be terminated at any 
time prior to a Transfer Date:

                            (a)  by the mutual consent of SBCL and ActaMed;

                                     -51-
<PAGE>

                            (b)  by SBCL by written notice of termination to 
ActaMed given after ActaMed shall have failed to meet the Transfer Benchmarks 
with respect to a Region by any applicable Measurement Date;

                            (c)  by ActaMed, if SBCL shall (1) fail to 
perform in any material respect its agreements contained herein required to 
be performed by it on or prior to such Transfer Date, or (2) materially 
breach any of its representations, warranties or covenants contained herein;

                            (d)  by SBCL, if ActaMed shall (1) fail to 
perform in any material respect its agreements contained herein required to 
be performed by it on or prior to such Transfer Date, or (2) materially 
breach any of its representations, warranties or covenants contained herein; 

                            (e)  by either SBCL or ActaMed if there shall be 
any order, writ, injunction or decree of any court or governmental or 
regulatory agency binding on ActaMed or SBCL which prohibits or restrains 
ActaMed or SBCL from consummating the transactions contemplated by this 
Assets Purchase Agreement, provided that ActaMed and SBCL shall have used 
their best efforts to have any such order, writ, injunction or decree lifted 
and the same shall not have been lifted within thirty (30) days after entry;

                            (f)  by SBCL if SBCL terminates the Services 
Agreement; or

                            (g)  by ActaMed if ActaMed terminates the 
Services Agreement.

                    10.1.2  NOTICE OF TERMINATION.  Notice of termination of 
this Assets Purchase Agreement, as provided for in this Article, shall be 
given by the party so terminating to the other party in accordance with 
Section 11.1.1 of this Assets Purchase Agreement.  Any such termination shall 
be effective as of the date of such notice, unless otherwise provided in such 
notice.

                    10.1.3  EFFECT OF TERMINATION.  If this Assets Purchase 
Agreement is terminated pursuant to Section 10.1 then, with respect to all 
transactions contemplated by this Assets Purchase Agreement as to which no 
Transfer Date has occurred (the "Future Transfers"), the obligations of the 
parties as to such Future Transfers shall become void and of no further force 
and effect, and each party shall pay the costs and expenses incurred by it in 
connection with this Assets Purchase Agreement as set forth herein and no 
party (nor any of its officers, directors, employees, agents, representatives 
or stockholders) shall be liable to any other party for any costs, expenses, 
damages (direct or indirect) or loss of anticipated profits for Future 
Transfers.

     SECTION 10.2  RISK OF LOSS.  SBCL assumes all risk of destruction, loss 
or damage due to fire or other casualty to the SCAN Assets located at SBCL 
Sites. SBCL shall remit all insurance proceeds relating to SCAN Assets not 
transferred by reason of such destruction, loss or 

                                     -52-
<PAGE>

damage to ActaMed.  If ActaMed and SBCL are unable to agree upon the amount 
of such insurance proceeds applicable to the affected SCAN Assets, the 
dispute shall be resolved jointly by the independent accounting firms then 
employed by ActaMed and SBCL, and if said accounting firms do not agree, they 
shall appoint a nationally recognized accounting firm, whose determination of 
the dispute shall be final and binding.

                                  ARTICLE 11  

                                 MISCELLANEOUS

     SECTION 11.1  GENERAL PROVISIONS.


                    11.1.1  NOTICES.  All notices, requests, demands and 
other communications hereunder shall be in writing and shall be deemed to 
have been given if (1) delivered by hand or if mailed by United States 
registered or certified mail, return receipt requested, first class postage 
prepaid, (2) sent by Federal Express or similar overnight courier service to 
the parties or their assignees, or (3) sent by telecopy to the number set 
forth below and promptly followed by a written copy sent by any other means 
specified herein, addressed as follows:

                    If to SBCL:


                              SmithKline Beecham Clinical Laboratories, Inc.
                              1201 South Collegeville Road
                              Collegeville, PA 19426
                              Attention: John B. Okkerse, Jr., PhD, President
                              Telephone: [*]
                              Telecopy:  [*]

                    with a copy to:

                              SmithKline Beecham Corporation 
                              One Franklin Plaza
                              16th and Race Streets
                              Philadelphia, PA 19103
                              Attention: General Counsel-U.S.
                              Telephone: [*]
                              Telecopy:  [*]

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                     -53-
<PAGE>

                              If to ActaMed:

                              ActaMed Corporation
                              Suite 600
                              7000 Central Parkway
                              Atlanta, Georgia  30328
                              Attention:  Chief Financial Officer
                              Telephone: (770) 352-1600
                              Telecopy:  (770) 352-1815

                    with a copy to:

                              Alston & Bird
                              One Atlantic Center
                              1201 West Peachtree Street
                              Atlanta, Georgia  30309-3424
                              Attention:  John C. Weitnauer, Esq.
                              Telephone:  (404) 881-7780
                              Telecopy Number:  (404) 881-7777

                              (a)  If delivered personally, the date on which 
a notice, request, instruction or document is delivered shall be the date on 
which such delivery is made and, if delivered by mail, telecopy, Federal 
Express or other overnight courier, the date on which such notice, request, 
instruction or document is first received shall be the date of delivery.

                              (b)  Any party hereto may change its address 
specified for notices herein by designating a new address by notice in 
accordance with this Section 11.1.

                              (c)  Failure of any party to send a copy of any 
notice to counsel for the other Party shall not affect in any way the 
validity of such notice to other party.

                    11.1.2  FURTHER ASSURANCES.  Each party covenants that at 
any time, and from time to time, after any Transfer Date, it will execute 
such additional instruments and take such actions as may be reasonably 
requested by the other party to confirm or perfect or otherwise to carry out 
the intent and purposes of this Assets Purchase Agreement.

                    11.1.3  WAIVER.  Any failure on the part of any party 
hereto to comply with any of its obligations, agreements or conditions 
hereunder may be waived by any other party to whom such compliance is owed.  
No waiver of any provision of this Assets Purchase Agreement shall be deemed, 
or shall constitute, a waiver of any other provision, whether or not similar, 
nor shall any waiver constitute a continuing waiver.

                    11.1.4  ASSIGNMENT.  This Assets Purchase Agreement shall 
not be assignable by any of the parties hereto without the written consent of 
the other party hereto, and 

                                     -54-
<PAGE>

no rights under this Assets Purchase Agreement may be transferred without the 
consent of the non-transferring party, except that:

                              (a)  the rights of ActaMed under this Assets 
Purchase Agreement may be transferred to any Person that acquires all or 
substantially all of the business or assets of ActaMed related to the ActaLab 
Software and the Network (whether by purchase of assets, merger or other 
corporate reorganization), [*];

                              (b)  the rights of SBCL under this Assets 
Purchase Agreement may be transferred before or after the last Transfer Date 
in connection with a transfer of shares of Series D Preferred Stock made in 
accordance with the provisions of the Stockholders' Agreement; and

                              (c)  all the rights of SBCL may be transferred 
to an Affiliate of SBCL or an acquiror of substantially all of its assets 
(whether by purchase of assets, merger or other corporate reorganization).

Any attempted assignment without such consent shall be void.  If the parties 
cannot agree upon whether a company competes with SBCL, the parties shall 
resolve the dispute pursuant to Article IX. Any assignment with consent does 
not release the assigning party from any of its obligations under this Assets 
Purchase Agreement unless the consent so states.  Any transferee of SBCL 
permitted pursuant to clause (b) above shall execute and deliver to ActaMed 
an instrument satisfactory to it agreeing to be bound by the provisions 
hereof and of the Stockholders' Agreement and the Registration Rights 
Agreement.

                    11.1.5  BINDING EFFECT.  Subject to the limitations on 
transfer set forth in Section 11.1.4, this Assets Purchase Agreement shall be 
binding upon and inure to the benefit of the parties hereto and their 
respective heirs, legal representatives, executors, administrators, 
successors and assigns.

                    11.1.6  KNOWLEDGE.  The use of the terms "to ActaMed's 
knowledge" or words of similar import shall refer to the facts known to [*] 
Michael K. Hoover and [*] after reasonable inquiry.  The use of the 
terms "to SBCL's knowledge" or words of similar import shall refer to the 
facts known to [*] after reasonable inquiry.

                    11.1.7  HEADINGS.  The section and other headings in this 
Assets Purchase Agreement are inserted solely as a matter of convenience and 
for reference, and are not a part of this Assets Purchase Agreement.

                    11.1.8  ENTIRE AGREEMENT.  This Assets Purchase Agreement 
and the Exhibits, Schedules, certificates and other documents delivered 
pursuant hereto or incorporated 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                     -55-
<PAGE>

herein by reference, contain and constitute the entire agreement among the 
parties hereto and supersede and cancel any prior agreements, 
representations, warranties, or communications, whether oral or written, 
among the parties hereto relating to the transactions contemplated hereby or 
the subject matter herein.  This Assets Purchase Agreement may be changed, 
waived, discharged or terminated only by an agreement in writing signed by 
(a) ActaMed and (b) SBCL or, after the last of the Transfer Dates, the 
holder(s) of a majority of the Shares of Series D Preferred Stock and any 
Conversion Shares considered as a single class.

                    11.1.9  GOVERNING LAW.  Except for the matters referred 
to by Section 9.3, this Assets Purchase Agreement shall be governed by and 
construed in accordance with the laws of the State of Georgia.

                    11.1.10  COUNTERPARTS.  This Assets Purchase Agreement 
may be executed in one or more counterparts, each of which shall be deemed an 
original, but all of which together shall constitute one and the same 
instrument.

                    11.1.11  PRONOUNS.  All pronouns used herein shall be 
deemed to refer to the masculine, feminine or neutral gender as the context 
requires.

                    11.1.12  TIME OF ESSENCE.  Time is of the essence in this 
Assets Purchase Agreement.

                    11.1.13  SCHEDULES AND EXHIBITS.  All Schedules and 
Exhibits attached to this Assets Purchase Agreement are by this reference 
made a part hereof.




                          [SPACE INTENTIONALLY LEFT BLANK]





                                     -56-
<PAGE>

IN WITNESS WHEREOF, the parties hereto have executed this Assets Purchase 
Agreement under seal as of the day and year first above written.


                                       ActaMed Corporation


                                       /s/
                                       -----------------------------------
                                       By:  Michael K. Hoover
                                       Its: President



                                       SmithKline Beecham Clinical 
                                        Laboratories, Inc. 


                                       /s/  
                                       -----------------------------------
                                       By:  John B. Okkerse Jr.
                                       Its: President

                                     -57-
<PAGE>

                                      EXHIBIT A

                                     DEFINITIONS

          "AAA" means the American Arbitration Association.

          "ActaLab Software" means the ActaLab Software, as defined under the 
License Agreement.

          "ActaMed" means ActaMed Corporation, a Georgia corporation.

          "ActaMed Business" means the business of developing and selling 
information systems and related technology for the healthcare industry.

          "ActaMed Common Stock" means the $.01 par value common stock of 
ActaMed.

          "ActaMed Documents" has the meaning given in Section 3.2.1 of the 
Assets Purchase Agreement.

          "ActaMed Financial Statements" has the meaning given in Section 
3.2.3(a) of the Assets Purchase Agreement.

          "ActaMed Indemnitee" means ActaMed and its directors, officers, 
employees,  affiliates and permitted assigns.

          "ActaMed Network" means the EDI system and network operated by 
ActaMed for electronic laboratory test order entry and/or results reporting, 
which includes the Network Software and ActaMed's gateway and hardware and 
computer systems needed to operate that software.

          "ActaMed President" means the President of ActaMed, presently 
Michael Hoover, or should ActaMed be restructured in any manner, the officer 
of ActaMed having top authority over ActaMed's operations.

          "ActaMed Site" means a Provider [*] utilizing the Network for 
Lab EDI Services that was an SBCL Site on the Transfer Date of the Region in 
which such Provider [*] is located.

          "ActaMed Unaudited Statements" has the meaning given in Section 
3.2.3(a) of the Assets Purchase Agreement.

          "Affiliate" means, with respect to any Person, any other Person 
controlling, controlled by or under common control with such Person.

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                      A-1
<PAGE>

          "Applicable Transfer Date" means, with respect to an SBCL Site, the 
Transfer Date of the Region in which the SBCL Site is located.

          "Articles" means the Fourth Amended and Restated Articles of 
Incorporation of ActaMed, as the same may be hereafter amended from time to 
time.

          "Assumption Agreement" the agreement attached as EXHIBIT 2.6.2 to 
the Assets Purchase Agreement.

          "Automated Provider" means a Provider [*] who or which, on  the 
Transfer Date of the Region in which the Provider [*] is located, uses the 
SCAN Network to send clinical laboratory test orders to an SBCL Lab or to 
receive test result reports from an SBCL Lab.

          "Claim" means any claim for indemnification under Article VIII of 
the Assets Purchase Agreement, including but not limited to a General Claim, 
a Tax Claim or an Ownership Claim.

          "Claims Notice" means a written notice of an indemnification claim 
delivered pursuant to Section 8.2.3 of the Assets Purchase Agreement.

          "Code" means the Internal Revenue Code of 1986, as amended.

          "Communication Plan" shall have the meaning assigned in Section 
4.3.4.

          "Contract" means any written contract, agreement, lease, plan, 
instrument or other document, commitment, arrangement, undertaking, practice 
or authorization that is or may be binding on any Person or its property 
under applicable law.

          "Conversion Shares" means the shares of ActaMed Common Stock issued 
or issuable upon the conversion of, unless specified otherwise, all of the 
Preferred Shares.

          "Court Order" means any judgment, decree, writ, injunction, order 
or ruling of any federal, state or local court or governmental or regulatory 
body or authority that is binding on any Person or its property under 
applicable law.

          "Default" means (a) a breach of or default under any Contract or 
License, (b) the occurrence of an event that with the passage of time or the 
giving of notice or both would constitute a breach of or default under any 
Contract or License or (c) the occurrence of an event that with or without 
the passage of time or the giving of notice or both would give rise to a 
right of termination, renegotiation or acceleration under any Contract or 
License.

          "Development Agreement" means the Development Agreement between 
SBCL and ActaMed dated October 31, 1997 for the initial development of the 
ActaLab Software.

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.

                                      A-2
<PAGE>

          "Dispute Notice" has the meaning given in Section 9.2.1 of the 
Assets Purchase Agreement.

          "Disputing Party" has the meaning given in Section 9.2 of the 
Assets Purchase Agreement.

          "EDI" means electronic data interchange.

          "Employee Benefit Plan" means any pension, retirement 
profit-sharing, deferred compensation, bonus, incentive, performance, stock 
option, phantom stock, stock purchase, restricted stock, medical, 
hospitalization, vision, dental or other health, life, disability, severance, 
termination or other employee benefit plan, program, arrangement, agreement 
or policy, whether written or unwritten, to which ActaMed contributes or is 
obligated to contribute, is a party to or is otherwise bound, or with respect 
to which ActaMed may have any Liability.  

          "Employee Computer" shall have the meaning assigned in Section 
1.2.1 of this Assets Purchase Agreement.

          "ERISA" means the Employee Retirement Income Security Act of 1974,  
as amended.

          "ERISA Affiliate" means (i) a member of any "controlled group," as 
defined in Section 414(b) of the Code, of which ActaMed is a member, (ii) a 
trade or business, whether or not incorporated, under common control (within 
the meaning of Section 414(c) of the Code) with ActaMed, or (iii) a member of 
any affiliated service groups (within the meaning of Section 414(m) of the 
Code) of which ActaMed is a member.  

          "Exchange Act" means the Securities Exchange Act of 1934, as 
amended.

          "FASB 5" means Statement of Financing Accounting Standards No. 5 
issued by the Financial Accounting Standards Board in March 1975.

          "Fourth Amended Articles" means the Fourth Amended and Restated 
Articles of Incorporation of ActaMed.

          "GAAP" means generally accepted accounting principles.

          "General Claim" means any claim other than a Tax Claim, Ownership 
Claim or Undisclosed Liability Claim based upon, arising out of or otherwise 
in respect of  any inaccuracy in any representation or warranty or any breach 
of any covenant or agreement made or to be performed by a Party pursuant to 
this Assets Purchase Agreement.

          "HSR Act"  means Section 7A of the Clayton Act, as added by Title 
II of the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, 
and the Regulations promulgated thereunder.

                                      A-3
<PAGE>

          "Implementation Committee" has the meaning given in Section 4.2.2 
of the Assets Purchase Agreement.

          "Implementation Plan" has the meaning given in Section 4.2.1 of  
the Assets Purchase Agreement.

          "Indemnifying Party" means the Party obligated to provide 
indemnification pursuant to Sections 8.2.1 or 8.2.2 of the Assets Purchase 
Agreement.

          "Indemnitee" means a Party seeking indemnification under Sections 
8.2.1 or 8.2.2 of the Assets Purchase Agreement.

          "Integrity Agreement" shall have the meaning given in the Services 
Agreement.

          "Intellectual Property" means copyrights, trademarks, service 
marks, trade names, patents, applications therefor, technology rights and 
licenses, computer software (including, without limitation, any source or 
object codes therefor or documentation relating thereto), computer software 
licenses, trade secrets, franchises, know-how, inventions and intellectual 
property rights.

          "Lab EDI Services" means electronic connectivity services enabling 
an Automated Provider to send Transmittal Information electronically to an 
SBCL Lab and/or to receive electronically Transmittal Information from an 
SBCL Lab utilizing the Network.

          "Liability" means any direct or indirect liability, indebtedness, 
obligation, expense, claim, deficiency, guaranty or endorsement of or by any 
Person (other than endorsements of notes, bills and checks presented to banks 
for collection or deposit in the ordinary course of business) of any type, 
whether accrued, absolute, contingent, matured, unmatured or other.

          "License Agreement" means the License Agreement between SBCL and 
ActaMed dated the date of the Assets Purchase Agreement and described in the 
preamble to the Assets Purchase Agreement.

          "License" means any license, franchise, notice, permit, easement, 
right, authorization or filing.

          "Lien" means any mortgage, lien, security interest, pledge, 
encumbrance, restriction on transferability, defect of title, charge or claim 
of any nature whatsoever on any property or property interest.

          "Litigation" means any lawsuit, action, claim, arbitration, 
administrative or other proceeding, criminal prosecution or governmental 
investigation or inquiry involving or affecting a Party or its business, 
assets or Contracts to which it is a party or by which it or its business, 
assets or Contracts may be bound or affected.

                                      A-4
<PAGE>

          "Losses" means any and all demands, claims, actions or causes of 
action, assessments, losses, diminution in value, damages (including special 
and consequential damages), liabilities, costs, and expenses, including 
without limitation, interest, penalties, cost of investigation and defense, 
and reasonable attorneys' and other professional fees and expenses.

          "Material Adverse Effect" means a material adverse effect on the 
business or financial condition of ActaMed or on the ability of ActaMed to 
conduct the ActaMed Business or the impairment of ActaMed's ability to 
perform its obligations under the ActaMed Documents.

          "Network" means the SCAN Network and/or the ActaMed Network.

          "Network Software" means ActaMed's personal computer version of the 
ProviderLink and ActaLink presentation and network software programs, under 
whatever name marketed, and the SBCL Software and the ActaLab Software, and 
all Changes to them, which are licensed to Automated Providers and which 
allow access to the Network for the transmission of laboratory test order 
entries and reception of test result information.

          "New Business Plan" means the New Business Plan for ActaMed 
prepared in accordance with Section 5.1.8 of this Assets Purchase Agreement.

          "OIG" shall have the meaning assigned in Section 4.4 of this Assets 
Purchase Agreement.

          "Ownership Claim" means any claim arising out of or otherwise in 
respect of any inaccuracy in the representations and warranties set forth in 
Sections 3.1.1, 3.1.2, 3.1.6 or 3.1.13, or 3.2.1, 3.2.2, 3.2.11, or 3.2.12 of 
the Assets Purchase Agreement.

          "Panel" has the meaning set forth in Section 9.2.1.

          "PC Systems" means the assets described in Section 1.1.1 of the 
Assets Purchase Agreement.

          "Performance Standards" has the meaning given such term in the 
Services Agreement.

          "Permitted Owner" means SBCL or a successor owner of SBCL's Series 
D Preferred Stock or Conversion Shares permitted under the Stockholders 
Agreement among ActaMed and its stockholders, as amended from time to time.

          "Person" means any individual, corporation, trust, estate, business 
trust, general or limited partnership, limited liability company, limited 
liability partnership, unincorporated association or other legal entity.

          "Phone Lines" means SBCL's contractual right to use certain phone 
lines, as more fully described in Section 1.1.2 of this Assets Purchase 
Agreement.

                                      A-5
<PAGE>

          "Preferred Stock" means the Series A Preferred Stock, the Series B 
Preferred Stock, the Series C Preferred Stock and the Series D Preferred 
Stock.

          [*] means an [*].

          "Projections" shall have the meaning assigned in Section 3.1.3 of 
this Assets Purchase Agreement.

          "Provider" means a physician, clinic, hospital, patient service 
center (other than [*]) or other provider of clinical health care services.

          "Provider Agreements" means the contracts described in Section 
1.1.3 of this Assets Purchase Agreement.

          "Public Offering" means a bona fide firm commitment underwritten 
offering of ActaMed Common Stock pursuant to a registration statement filed 
with and declared effective by the Securities and Exchange Commission 
pursuant to the Securities Act.

          "Region" means any one of Region One, Region Two, Region Three, or 
Region Four.

          "Region Four" means the Region described on SCHEDULE 2.2(d)

          "Region Four Sites" are the SCAN Sites located in Region Four.

          "Region Four Transfer Date" has the meaning given in Section 2.3.4 
of the Assets Purchase Agreement.

          "Region One" means the Region described on SCHEDULE 2.2(a)

          "Region One Sites" are the SCAN Sites located in Region One.

          "Region One Transfer Date" means December 31, 1997.

          "Region Three" means the Region described on SCHEDULE 2.2(c).

          "Region Three Sites" are the SCAN Sites located in Region Three.

          "Region Three Transfer Date" has the meaning given in Section 2.3.3 
of the Assets Purchase Agreement.

          "Region Two" means the Region described on SCHEDULE 2.2(b).

          "Region Two Sites" are the SCAN Sites located in Region Two.

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                      A-6
<PAGE>

          "Region Two Transfer Date" has the meaning given in Section 2.3.2 
of the Assets Purchase Agreement.

          "Registration Rights Agreement" means the Registration Rights 
Agreement dated May 3, 1994, as amended as of the date hereof and as the same 
may be amended from time to time, by and among ActaMed and the stockholders 
of ActaMed signatory thereto.

          "Regulation" means any statute, law, ordinance, regulation, 
requirement, order or rule of any federal, state, or local government or 
other governmental agency or body or of any other type of regulatory body, or 
any governmental or administrative interpretation of any thereof, including, 
without limitation, (i) those covering health, safety, environmental, energy, 
transportation, bribery, record keeping, zoning, antidiscrimination, 
antitrust, wage and hour, and price and wage control matters, (ii) 
requirements imposed by any governmental or regulatory body which must be 
satisfied to qualify for Medicare reimbursements, and (iii) any and all 
federal, state and local health care laws relating to or covering the methods 
and ways in which Lab EDI Services and other related or incidental services 
or benefits, if any, are provided to the Automated Providers, including, but 
not limited to, 42 U.S.C. Section 1395nn and the Clinical Laboratory 
Improvements Act of 1988, as amended.

          "Relationship Manager" has the meaning given in Section 4.2.2 of 
the Assets Purchase Agreement.

          "Required Consents" means any and all licenses, waivers, consents 
or approvals from other parties to Contracts necessary to consummate the 
transactions contemplated hereby and by any Exhibit hereto.

          "SBCL" means SmithKline Beecham Clinical Laboratories, Inc., a 
Delaware corporation.

          "SBCL Documents"  has the meaning given in Section 3.1.1 of the 
Assets Purchase Agreement.

          "SBCL Lab" means any location at which SBCL or its Affiliates 
provide, or may in the future provide, clinical laboratory testing services, 
regardless of the computer systems or software, if any, used by such lab for 
lab order entry and results reporting.

          "SBCL President" shall mean the President of SBCL, presently John 
B. Okkerse, Jr., Ph.D., or should SBCL be restructured in any manner, the 
officer of SBCL having top authority over SBCL's operations.

          "SBCL Site" means an Automated Provider utilizing the SCAN Network 
for Lab EDI Services on the Transfer Date of the Region in which such 
Automated Provider is located.

          "SBCL Software" means SBCL Software, as defined in the License 
Agreement.

                                      A-7
<PAGE>

          "SCAN Assets" means the assets described in subsections 1.1.1 
through 1.1.6 of the Assets Purchase Agreement.

          "SCAN Network" means the SBCL Software and SBCL's hardware and 
computer systems needed to operate the SBCL Software which enables Automated 
Providers to place laboratory test orders electronically to an SBCL Lab 
and/or to receive test result reports electronically from an SBCL Lab.

          "SCAN Site" means either an SBCL Site or an ActaMed Site.

          "SCAN Software" means the SBCL SCAN-TM- software licensed to 
ActaMed pursuant to the License Agreement.

          "Schedule" means any of the lists or disclosure schedules referred 
to herein.

          "SEC" means the Securities and Exchange Commission.

          "Securities Act" means the Securities Act of 1933, as amended.

          "Series A Preferred Stock" means the Series A Convertible Preferred 
Stock of ActaMed.

          "Series B Preferred Stock" means the Series B Convertible Preferred 
Stock of ActaMed.

          "Series C Preferred Stock" means the Series C Convertible Preferred 
Stock of ActaMed.

          "Series D Preferred Stock" means the Series D Convertible Preferred 
Stock of ActaMed.

          "Services Agreement" means the Services Agreement, made and entered 
into as of the date hereof, between ActaMed and SBCL.

          "Standstill Agreement" means the Standstill Agreement, dated the 
date hereof between SBCL and ActaMed.

          "Stockholders Agreement" means the Stockholders Agreement, dated as 
of May 3, 1994, as amended as of the date hereof and as the same may be 
amended from time to time, between ActaMed and the stockholders of ActaMed 
who are signatories thereto.

          "Stock Option Plans" means ActaMed's 1997 Stock Option Plan, 1996 
Directors Stock Option Plan, 1995 Stock Option Plan, 1994 Stock Option Plan, 
1993 Stock Option Plan and 1992 Stock Option Plan.

                                      A-8
<PAGE>

          "Subsidiary" means a corporation, limited liability company, 
partnership, association, trust, joint venture or other entity in which 
ActaMed or SBCL, as the case may be, has, directly or indirectly, an equity, 
ownership or proprietary interest of greater than ten percent (10%).

          "Substantial Holder" means an officer or employee of ActaMed who is 
the beneficial owner of one percent (1%) or more of the outstanding voting 
power or the outstanding equity (on a fully diluted basis) of ActaMed.

          "Tax Claim" means any claim based upon, arising out of or otherwise 
in respect of any inaccuracy in any representation or warranty or breach of 
any covenant or agreement made or to be performed by a Party pursuant to this 
Assets Purchase Agreement related to any Taxes.

          "Taxes" means any federal, state, county, local and other taxes, 
including without limitation, income taxes, estimated taxes, excise taxes, 
sales taxes, use taxes, gross receipts taxes, franchise taxes, taxes on 
earnings and profits, employment and payroll related taxes, property taxes, 
real property transfer taxes, Federal Insurance Contributions Act taxes, 
taxes on value added and import duties, whether or not measured in whole or 
in part by net income, imposed by the United States or any political 
subdivision thereof or by any Jurisdiction other than the United States or 
any political subdivision thereof.

          "Third Party Claim" means any claim, suit or proceeding (including, 
without limitation, a binding arbitration or an audit by any taxing 
authority) that is instituted against an Indemnitee by a Person other than an 
Indemnitor and which, if prosecuted successful, would result in a Loss for 
which such Indemnitee is entitled to indemnification hereunder.

          "Third Party Software" means software that SBCL licensed from third 
parties for use in delivery of Lab EDI Services, including without limitation 
software known as pkZip and pkUnzip, ProCom, and Reach Out.

          "Trade Secrets" means information related to a Party (1) which 
derives economic value, actual or potential, from not being generally known 
to or readily ascertainable by other Persons who can obtain economic value 
from its disclosure or use, and (2) which is the subject of efforts by said 
Person that are reasonable under the circumstances to maintain its secrecy.  
Without limitation, for ActaMed, ProviderLink and the ActaLab Software are 
Trade Secrets, and for SBCL, the SBCL Software is a Trade Secret.

          "Transaction Documents" means the Assets Purchase Agreement, the 
Development Agreement, the License Agreement, the Services Agreement and all 
documents executed or delivered in connection with the foregoing.

          "Transfer Benchmarks" means the criteria set forth on EXHIBIT 
2.3.1, timely achievement of which shall determine whether the SCAN Assets 
relating to SCAN Sites in the 

                                      A-9
<PAGE>

next Region to be transferred shall be transferred by SBCL to ActaMed 
pursuant to the Assets Purchase Agreement.

          "Transferred Employees" means the employees listed on SCHEDULE VI 
hereto.

          "Transfer Date" shall mean any one of and "Transfer Dates" shall 
mean more than one of the Region One Transfer Date, the Region Two Transfer 
Date, the Region Three Transfer Date, and the Region Four Transfer Date.

          "Transmittal Information" means information which an Automated 
Provider gives ActaMed for communication to SBCL over the Network, or which 
SBCL gives ActaMed for communication to an Automated Provider over the 
Network, including all copies of same, and including without limitation, data 
relating to laboratory records, clinical data, encounter data, test 
information, test codes and provider identification numbers (other than UPINs)

          "Undisclosed Liability Claim" means any claim arising out of or 
otherwise in respect of any inaccuracy in the representations and warranties 
set forth in Sections 3.2.3 or 3.2.8 of the Assets Purchase Agreement.

          "Vendor Contracts" means the Contracts described in Section 1.1.4 
of the Assets Purchase Agreement.

          "Warrant" means the Warrant to purchase 450,450 shares of ActaMed 
Common Stock at an exercise price of $5.00 issued by ActaMed to International 
Business Machines Corporation in December 1996.




                                      A-10

<PAGE>

                                    Exhibit 2.3.1

                                 TRANSFER BENCHMARKS

CLIENT SATISFACTION MEASUREMENTS

     ActaMed will provide such level of satisfactory Agreed Services (as 
defined in the Services Agreement) measured as set forth below.  The 
following "Transfer Benchmarks" will be used as the measurement for 
proceeding to the transfer of Region Two Sites, Region Three Sites and Region 
Four Sites.

REQUISITION VOLUME

     The first Transfer Benchmark shall be sustaining the monthly average 
number of Requisitions on a per-Site basis.  More specifically, ActaMed shall 
measure each month the volume of Requisitions for the ActaMed Sites in each 
Transferred Region.  It shall then calculate the average monthly per-Site 
Requisition volume.  This calculated average shall then be compared (i) to 
the mean of the average monthly per-Site Requisition volumes for the same 
Region for the twelve months immediately preceding the month for which the 
measurement was made and (ii) to the mean of the average monthly per-Site 
Requisition volumes for all non-Transferred Regions during the same time 
period.  If ActaMed's average monthly per-Site Requisition volume for the 
measured period, as adjusted for seasonality, is within 90% of each of (i) 
and (ii), above, then ActaMed will have met this benchmark.

     For Region One, SBCL shall provide within thirty (30) days after the 
Region One Transfer Date the monthly Requisitions and Sites for 
January-December 1997. For all other Regions, the monthly Requisitions and 
Sites for the twelve months prior to the Applicable Transfer Date shall be 
provided on the Applicable Transfer Date.

CUSTOMER SURVEYS

     The second Transfer Benchmark shall be sustaining levels of support and 
client acceptance satisfactory to SBCL, in its reasonable discretion, 
determined by comparing Transfer Surveys of the Automated Providers in each 
Transferred Region to a corresponding Initial Survey for such Automated 
Providers.

     The Initial Survey shall be a survey, in a format and with content 
approved by SBCL in advance, which shall be performed by ActaMed within 
thirty (30) days after each Transfer Date.  Such survey shall solicity 
performance and service-related comments from the Automated Providers about 
SBCL's provision of Lab EDI Services for that Region.  The initial survey 
shall be sent to ten percent (10%) of the Sites in each Region, selected at 
random by ActaMed.

     The Transfer Surveys for each Region shall be identical to the Initial 
Survey for such Region and shall be sent to the same Automated Providers, to 
the greatest extent possible, as the Initial

<PAGE>

Survey (and to replacement Automated Providers where not possible).  The 
Transfer Surveys shall solicit performance and service-related comments from 
the Automated Providers about ActaMed's provision of Lab EDI Services for 
each Region.  The Transfer Surveys shall be performed for each applicable 
Region within thirty (30) days prior to the each scheduled Transfer Date; 
provided, that a Transfer Survey for a given Region shall only solicit 
information pertaining to the period between the last Transfer Date and the 
next scheduled Transfer Date.

CUSTOMER COMPLAINTS

     The third and final Transfer Benchmark will be the absence of a material 
number (materiality to be determined by SBCL in its reasonable discretion 
relative to the frequency and severity of complaints) of documented problems 
and Automated Providers ceasing to do business with SBCL Labs citing issues 
related to Lab EDI Services provided by ActaMed.  SBCL will provide ActaMed 
with copies of any such documented problems within fifteen (15) days of their 
receipt.

                                       -2-

<PAGE>


                                    Exhibit 2.5.1

                             BILL OF SALE AND ASSIGNMENT

     This is a Bill of Sale and Assignment from SmithKline Beecham Clinical 
Laboratories, Inc., a Delaware corporation ("SBCL"), to ActaMed Corporation, 
a Georgia corporation ("ActaMed"), pursuant to a certain Assets Purchase 
Agreement dated as of December ___, 1997 between SBCL and ActaMed (the 
"Assets Purchase Agreement").  Capitalized terms used and not defined herein 
shall have the meanings set forth in the Assets Purchase Agreement.

     1.   For good and valuable consideration, the receipt and sufficiency of 
which are hereby acknowledged, SBCL hereby sells, assigns, transfers, conveys 
and delivers to ActaMed, its successors and assigns, to have and to hold 
forever:

          (a)  all of its right, title and interest in and to the SCAN Assets 
located at SCAN Sites in Region ___, listed on Exhibit A attached hereto, 
free and clear of all mortgages, liens, pledges, security interests, charges, 
claims and other encumbrances of any nature whatsoever other than those 
disclosed in the Assets Purchase Agreement or any Schedule thereto; and

          (b)  all of its rights in the single-copy licenses granting the 
right to use the Third Party Software (i) installed by, or in accordance with 
the instructions of, SBCL and (ii) resident on a PC System conveyed to 
ActaMed in accordance with the preceding subparagraph (a), which rights are 
in accordance with the provisions of Section 1.2.1 of the Assets Purchase 
Agreement; and

          (c)  all of its rights in the single-site licenses for Microsoft 
Windows to the extent contemplated by Section 1.2.2 of the Assets Purchase 
Agreement.

The assets described in the foregoing subparagraphs (a) -- (c) are 
hereinafter referred to as the "Transferred Assets."

     2.   From and after the Region ___ Transfer Date, upon request of 
ActaMed, SBCL shall duly execute, acknowledge and deliver all such further 
assignments, documents of transfer or conveyance, powers of attorney and 
assurances and do such further acts as may be reasonably required to convey 
to and vest in ActaMed and protect its rights, title and interest in 
enjoyment of all the Transferred Assets and as may be appropriate otherwise 
to carry out the transactions contemplated by the Assets Purchase Agreement 
and this Bill of Sale and Assignment.

     3.   In the event of a conflict between the terms and conditions of this 
Bill of Sale and Assignment and the terms and conditions of the Assets 
Purchase Agreement, the terms of the Assets Purchase Agreement shall govern, 
supersede and prevail.

     4.   Notwithstanding anything herein to the contrary, the terms and 
conditions of the Assets Purchase Agreement shall survive the execution and 
delivery of this Bill of Sale and Assignment.

<PAGE>


     5.   This instrument shall be governed by and construed in accordance 
with the laws of the State of Georgia.

     6.   This instrument shall be binding upon and shall inure to the 
benefit of the parties hereto and their respective successors and assigns.

     IN WITNESS WHEREOF, and intending to be legally bound, the undersigned 
have duly executed and delivered this Bill of Sale and Assignment as of this 
___ day of _______________, 199_.

                                   SMITHKLINE BEECHAM CLINICAL
                                   LABORATORIES, INC.


                                   By:_____________________________________
                                   Title:



Acknowledged and agreed:

ACTAMED CORPORATION


By: _____________________________
Title: 

                                       -2-

<PAGE>

                                    Exhibit 2.5.2

                    SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC.

                                COMPLIANCE CERTIFICATE


     The undersigned certifies that he is a __________________________ of 
SmithKline Beecham Clinical Laboratories, Inc., a Delaware corporation 
("SBCL"), and that as such he is authorized to execute this certificate by 
and on behalf of the SBCL and, pursuant to Section 2.5.2 of the Assets 
Purchase Agreement, dated as of December __, 1997 (the "Asset Purchase 
Agreement"), between SBCL and ActaMed Corporation, a Georgia corporation 
("ActaMed"), and further certifies that:

          a.   The representations and warranties of SBCL, [other than the
representations and warranties contained in Sections 3.1.3, 3.1.4(a) - (e),
3.1.6(d) and 3.1.7(b),] contained in the Assets Purchase Agreement, as
supplemented by the Disclosure Schedule attached hereto, are true and correct
in all material respects at and as of the date hereof as though such
representation and warranties were made at and as of the date hereof.

          b.   SBCL has duly performed and complied with each covenant and 
condition required by the Assets Purchase Agreement to be performed or 
complied with before or on the date hereof.

     IN WITNESS WHEREOF, I have hereunto set my hand as of this ___ day of 
____________, 199_.

                                   By: ____________________________________
                                   Name:
                                   Title:



**   Bracketed text to be included on Region Two Transfer Date, Region Three
     Transfer Date, and Region Four Transfer Date only.

<PAGE>

                                    Exhibit 2.5.3

                    SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC.

                        CERTIFICATE OF THE ASSISTANT SECRETARY

     The undersigned certifies that he is the Secretary of SmithKline Beecham 
Clinical Laboratories, Inc., a Delaware corporation (the "Company"), and that 
as such he is authorized to execute and deliver this certificate by and on 
behalf of the Company, and further certifies that:

          a.   Attached hereto as Exhibit "A" is a true, correct and complete 
copy of the Company's Certificate of Incorporation, as certified by the 
Secretary of State of the State of Delaware; said Certificate of 
Incorporation is in full force and effect as of the date hereof; since the 
date of certification by the Secretary of State of the State of Delaware 
there have been no amendments, alterations or modifications of such 
Certificate of Incorporation; and no action has been taken by the Company in 
contemplation of any such amendment or the dissolution, merger or 
consolidation of the Company.

          b.   Attached hereto as Exhibit "B" is a true, correct and complete 
copy of the Bylaws of the Company as in effect on the date hereof, and there 
have been no additional amendments authorized with respect thereto.

          c.   Attached hereto as Exhibit "C" is a copy of the resolutions 
duly adopted by the Board of Directors of the Company on December 29, 1997, 
with respect to the Asset Purchase Agreement and the transactions 
contemplated hereby, and such resolutions have not been rescinded or amended 
in any respect and are in full force and effect on the date hereof.

          d.   Each of the following persons now is, and at all times 
including and since ___________________, 199_, has been a duly elected 
officer or employee of the Company, holding the office or position in the 
Company set forth opposite his name below, and the signature of each such 
person appearing opposite his name below is his genuine signature:

               [Name and title]     _______________________________________

               [Name and title]     _______________________________________


     IN WITNESS WHEREOF, I have hereunto set my hand this ___ day of
____________, 199_.


                                   By: _________________________________
                                       Assistant Secretary

<PAGE>


     I, __________________________, ________________________ of SmithKline 
Beecham Clinical Laboratories, Inc., a Delaware corporation, do hereby 
certify that ____________________ is the duly elected Assistant Secretary of 
the Company, and that the signature appearing above is his genuine signature.

     IN WITNESS WHEREOF, I have herewith set my hand this ___ day of 
_____________, 199_.




                                   __________________________________________
                                   [Title]


                                       -2-

<PAGE>


                                    Exhibit 2.6.2

                                 ASSUMPTION AGREEMENT

     This is an Assumption Agreement by ActaMed Corporation, a Georgia 
Corporation ("ActaMed"), in favor of SmithKline Beecham Clinical 
Laboratories, Inc., a Delaware corporation ("SBCL"), pursuant to and in 
accordance with Section 2.6.2 of the Assets Purchase Agreement, dated as of 
December ___, 199_ (the "Assets Purchase Agreement") between SBCL and 
ActaMed.  Capitalized terms used and not defined herein shall have the 
meanings set forth in the Assets Purchase Agreement.

     1.   For good and valuable consideration, the receipt and sufficiency of 
which are hereby acknowledged, and intending to be legally bound, ActaMed 
hereby assumes:

          (a)  all of SBCL's contractual liabilities arising on or after the 
date hereof with respect to the Phone Lines installed at SCAN Sites in Region 
___;

          (b)  all of SBCL's duties and obligations arising on or after the 
date hereof under such Provider Agreements as relate to Automated Providers 
located in Region ___; and

          (c)  all of SBCL's duties and obligations arising on or after the 
date hereof pursuant to the Vendor Contracts relating to the provision of 
products or services in connection with SBCL's provision of Lab EDI Services 
in Region ________.

ActaMed undertakes to perform the liabilities set forth in the preceding 
subparagraphs (the "Liabilities") in accordance with their respective terms, 
effective as of the date hereof.

     2.   From and after the Region ___ Transfer Date, ActaMed will, from 
time to time, at the reasonable request of SBCL, duly execute, acknowledge 
and deliver all such additional instruments, notices, releases, certificates, 
powers of attorney, assurances and other documents and do all such further 
acts as SBCL may reasonably require in order to effectively assume the 
Liabilities and as may be appropriate otherwise to carry out the transactions 
contemplated by the Assets Purchase Agreement and this Assumption Agreement.

     3.   In the event of any conflict between the terms and conditions of 
this Assumption Agreement and the terms of the Assets Purchase Agreement, the 
terms of the Assets Purchase Agreement shall govern, supersede and prevail.

     4.   If the assumption by ActaMed of any Liability is invalid or 
unenforceable in any jurisdiction, it shall be ineffective to the extent of 
such invalidity or unenforceability without invalidating or rendering 
unenforceable the assumption by Purchaser of the remaining Liabilities.

<PAGE>

     5.   Notwithstanding anything herein to the contrary, the terms and 
conditions of the Assets Purchase Agreement shall survive the execution and 
delivery of this Assumption of Liabilities.

     6.   This instrument shall be governed by and construed in accordance 
with the laws of the State of Georgia.

     7.   This instrument shall be binding upon and shall inure to the 
benefit of the parties hereto and their respective successors and assigns.

     IN WITNESS WHEREOF, the undersigned have caused this Assumption 
Agreement to be executed this ___ day of ________________, ______.


                                   ACTAMED CORPORATION


                                   By: _________________________________
                                   Name:  
                                   Title:  

Acknowledged and agreed:

SMITHKLINE BEECHAM CLINICAL
LABORATORIES, INC.


By: ____________________________
Name: 
Title: 

                                       -2-

<PAGE>


                                    Exhibit 2.6.3

                                 ACTAMED CORPORATION

                                COMPLIANCE CERTIFICATE


     The undersigned certifies that he or she is a 
_______________________________ of ActaMed Corporation, a Georgia corporation 
("ActaMed"), and that as such he or she is authorized to execute this 
certificate by and on behalf of ActaMed and, pursuant to Section 2.6.3 of the 
Assets Purchase Agreement, dated as of December ___, 1997 (the "Asset 
Purchase Agreement"), between SmithKline Beecham Clinical Laboratories, Inc. 
("SBCL") and ActaMed, and further certifies that:

          a.   The representations and warranties of ActaMed contained in the 
Assets Purchase Agreement, as supplemented by the Disclosure Schedule 
attached hereto are true and correct in all material respects at and as of 
the date hereof as though such representation and warranties were made at and 
as of the date hereof.

          b.   ActaMed has duly performed and complied with each covenant and 
condition required by the Assets Purchase Agreement to be performed or 
complied with before or on the date hereof.

     IN WITNESS WHEREOF, I have hereunto set my hand as of this ___ day of 
____________, 199_.

                                        By:  ______________________________
                                        Name:
                                        Title:

<PAGE>

                                    Exhibit 2.6.4

                                 ACTAMED CORPORATION

                             CERTIFICATE OF THE SECRETARY

     The undersigned certifies that he is the Secretary of ActaMed 
Corporation, a Georgia corporation (the "Company"), and that as such he is 
authorized to execute and deliver this certificate by and on behalf of the 
Company, and further certifies that:

          a.   Attached hereto as Exhibit "A" is a true, correct and complete 
copy of the Company's Articles of Incorporation, as certified by the 
Secretary of State of the State of Georgia; said Articles of Incorporation 
are in full force and effect as of the date hereof; since the date of 
certification by the Secretary of State of the State of Georgia there have 
been no amendments, alterations or modifications of such Articles of 
Incorporation; and no action has been taken by the Company in contemplation 
of any such amendment or the dissolution, merger or consolidation of the 
Company.

          b.   Attached hereto as Exhibit "B" is a true, correct and complete 
copy of the Bylaws of the Company as in effect on the date hereof, and there 
have been no additional amendments authorized with respect thereto.

          c.   Attached hereto as Exhibit "C" is a copy of the resolutions 
duly adopted by the Board of Directors of the Company on December __, 1997, 
with respect to the Assets Purchase Agreement and the transactions 
contemplated hereby, and such resolutions have not been rescinded or amended 
in any respect and are in full force and effect on the date hereof.

          d.   Each of the following persons now is, and at all times 
including and since ___________________, 199_, has been a duly elected 
officer or employee of the Company, holding the office or position in the 
Company set forth opposite his or her name below, and the signature of each 
such person appearing opposite his or her name below is his or her genuine 
signature:

               [Name and title]     _______________________________________

               [Name and title]     _______________________________________


     IN WITNESS WHEREOF, I have hereunto set my hand this ___ day of 
________________, 199_.

                                   By:  ________________________________
                                        Secretary

<PAGE>


     I, _________________________, _________________________ of ActaMed 
Corporation, a Georgia corporation, do hereby certify that _________________  
is the duly elected Secretary of the Company, and that the signature 
appearing above is his genuine signature.

     IN WITNESS WHEREOF, I have herewith set my hand this ___ day of 
_______________, 199_.

                                   _______________________________________
                                   [Title]

                                       -2-

<PAGE>

                                 ACTAMED CORPORATION

                             CERTIFICATE OF THE SECRETARY

     The undersigned certifies that he is the Secretary of ActaMed 
Corporation, a Georgia corporation (the "Company"), and that as such he is 
authorized to execute and deliver this certificate by and on behalf of the 
Company, and further certifies that:

          a.   Attached hereto as Exhibit "A" is a true, correct and complete 
copy of the Company's Articles of Incorporation, as certified by the 
Secretary of State of the State of Georgia; said Articles of Incorporation 
are in full force and effect as of the date hereof; since the date of 
certification by the Secretary of State of the State of Georgia there have 
been no amendments, alterations or modifications of such Articles of 
Incorporation; and no action has been taken by the Company in contemplation 
of any such amendment or the dissolution, merger or consolidation of the 
Company.

          b.   Attached hereto as Exhibit "B" is a true, correct and complete 
copy of the Bylaws of the Company as in effect on the date hereof, and there 
have been no additional amendments authorized with respect thereto.

          c.   Attached hereto as Exhibit "C" is a copy of the resolutions 
duly adopted by the Board of Directors of the Company on December 19, 1997, 
with respect to the Assets Purchase Agreement and the transactions 
contemplated hereby, and such resolutions have not been rescinded or amended 
in any respect and are in full force and effect on the date hereof.

          d.   Each of the following persons now is, and at all times 
including and since January 1, 1997, has been a duly elected officer or 
employee of the Company, holding the office or position in the Company set 
forth opposite his or her name below, and the signature of each such person 
appearing opposite his or her name below is his or her genuine signature:

Michael K. Hoover, President and CEO      /s/    
                                      _________________________________________


Nancy J. Ham, Sr. Vice President          /s/    
                                      _________________________________________


     IN WITNESS WHEREOF, I have hereunto set my hand this 31st day of 
December, 1997.

                                   By:    /s/    
                                      _________________________________________
                                      Lewis R. Belote
                                      Secretary

<PAGE>

     I, Nancy J. Ham, Senior Vice President of ActaMed Corporation, a Georgia 
corporation, do hereby certify that Lewis R. Belote is the duly elected 
Secretary of the Company, and that the signature appearing above is his 
genuine signature.

     IN WITNESS WHEREOF, I have herewith set my hand this 31st day of 
December, 1997.

                                           /s/    
                                   _________________________________________
                                   Nancy J. Ham
                                   Senior Vice President

                                       -2-

<PAGE>

                               AMENDMENT NO. 1 TO
                           ASSETS PURCHASE AGREEMENT


          This AMENDMENT NO. 1 TO ASSETS PURCHASE AGREEMENT ("Amendment No. 1")
is made and entered into this 18th day of May, 1998 by and between HEALTHEON
CORPORATION, a Delaware corporation ("Healtheon"), ACTAMED CORPORATION, a
Georgia corporation ("ActaMed") and SMITHKLINE BEECHAM CLINICAL LABORATORIES,
INC., a Delaware corporation ("SBCL").

          WHEREAS, ActaMed and SBCL entered into an Assets Purchase Agreement on
December 31, 1997 ("Purchase Agreement"); and

          WHEREAS, ActaMed has entered into that certain "Agreement and Plan of
Reorganization by and among Healtheon Corporation, MedNet Acquisition Corp. and
ActaMed Corporation dated as of February 24, 1998, (the "Healtheon Merger
Agreement"), and, in order to permit the closing of the Healtheon Merger
Agreement, the parties wish to amend the Purchase Agreement as set forth below.

          NOW THEREFORE, in consideration of the premises and the mutual
promises contained herein, the parties, intending to be legally bound, agree as
follows:

1.   DEFINITIONS.

     Capitalized terms used in this Amendment No.1 and not otherwise defined
herein have the meanings set forth in the Purchase Agreement.

2.   AMENDMENTS. 

     2.1    ACTAMED REFERENCES. Except as the context may require otherwise or
this Amendment specifies otherwise, the term "ActaMed" shall be deemed to refer
to Healtheon wherever it appears in the Purchase Agreement. 

     2.2    PURCHASE PRICE.  Sections 1.5.4. and 1.5.5 are each amended by
substituting the phrase "Common Stock of Healtheon" for the phrase "ActaMed's
Series D Preferred" and by substituting the term "Healtheon Stock Price" for the
term "Series D Price."

     2.3    HEALTHEON STOCK PRICE.  Section 1.6 is amended as follows:

            2.3.1  The caption shall be changed to "HEALTHEON STOCK PRICE" and
the term "Series D Price" in the lead-in clause shall be replaced with the term
"Healtheon Stock Price".

                                     -1-
<PAGE>

            2.3.2  Section 1.6.1 (a) is amended by inserting the phrase
"divided by the Exchange Ratio" after "[*]" and "[*]".

            2.3.3  Section 1.6.1 (c) is amended by inserting the phrase
"divided by the Exchange Ratio on the Region Three Transfer Date or the Region
Four Transfer Date, as applicable" after "[*]".

            2.3.4  Section 1.6.3 is replaced in its entirety as follows:

            "1.6.3  For purposes of Section 1.6, "Qualified Preferred
            Stock" shall mean shares of Healtheon's preferred stock issued
            in an arm's length transaction to one or more purchasers who
            are not ActaMed or Healtheon's stockholders as of the Merger
            Effective Date for an aggregate purchase price of not less
            than $7,000,000; and the "Per Share Issue Price" of such
            Qualified Preferred Stock shall be the consideration per
            equivalent share of Common Stock received by Healtheon for the
            Qualified Preferred Stock multiplied by the Exchange Ratio,
            adjusted backwards to the Merger Effective Date for any
            subdivision or combination of shares of Healtheon capital
            stock or similar change in Healtheon's capital structure
            (whether by stock split, stock dividend, merger, share
            exchange, consolidation or otherwise) since the Merger
            Effective Date."

     2.4    DELIVERIES AT EACH OF THE TRANSFER DATES.  Section 2.6 is replaced
in its entirety as follows:

            "SECTION 2.6.  DELIVERIES AT EACH OF THE TRANSFER
            DATES.  At each of the Transfer Dates, the following
            documents shall be executed and delivered to SBCL to
            the extent relating to the region transferred:

                           2.6.1.  by Healtheon, the applicable
            number of shares of Common Stock of Healtheon, as
            determined in accordance with Sections 1.5, 1.6 and 1.8
            of this Assets Purchase Agreement;

                           2.6.2.   by either Healtheon or ActaMed,
            an Assumption Agreement (in the form attached hereto as
            EXHIBIT 2.6.2) covering, for the Region transferred,
            (i) the Vendor Contracts for the Region transferred,
            (ii) the Phone Lines and (iii) the Provider Agreements
            for the Region transferred;

                           2.6.3    by Healtheon and ActaMed, a
            Compliance Certificate (in the form attached hereto as
            EXHIBIT 2.6.3), pursuant to which Healtheon and ActaMed
            will jointly and severally make the representations and
            warranties contained in Section 3.2 hereof, which
            certificate shall attach revised Disclosure Schedules
            to the 

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                     -2-
<PAGE>

            extent necessary to make the representations and warranties 
            made on such Transfer Date true and correct in all material 
            respects;

                           2.6.4    by Healtheon, a Secretary's Certificate 
            (in the form attached hereto as EXHIBIT 2.6.4); and

                           2.6.5    by either Healtheon or ActaMed, such 
            other documents or certificates as may be reasonably requested by 
            SBCL."

     2.5    REPRESENTATIONS AND WARRANTIES.

            2.5.1  INVESTMENT REPRESENTATIONS OF SBCL.  Section 3.1.12 is
amended by deleting the parentheticals referencing the "Conversion Shares" in
each of subsections (a) and (b), and by adding the words "or Common Stock of
Healtheon" after the term "Series D Preferred Stock" in each of subsections (a)
and (b).

            2.5.2  BY ACTAMED AND HEALTHEON.  The lead-in paragraph of Section
3.2 is replaced in its entirety as follows:

            "SECTION 3.2. BY ACTAMED AND HEALTHEON.  Except as set
            forth on a Disclosure Schedule hereto, for
            representations to be made on any Transfer Date after
            the Merger Effective Date, ActaMed and Healtheon hereby
            jointly and severally represent and warrant to SBCL,
            and will jointly and severally represent and warrant to
            SBCL on each such Transfer Date, as follows:"

Other than as specifically set forth in Sections 2.5.3 through 2.5.9 of this
Amendment No. 1, each of the representations and warranties set forth in
Sections 3.2.1 through 3.2.25 of the Purchase Agreement are amended as necessary
to the effect that such representations and warranties shall be made on any
Transfer Date after the Merger Effective Date by both ActaMed and Healtheon.

            2.5.3 FINANCIAL STATEMENTS.  Section 3.2.3 is amended as follows:

                    2.5.3.1  Subsection (a) is amended by adding the following
text at the end of such subsection:

            "DISCLOSURE SCHEDULE 3.2.3 hereto also contains a true
            and correct copy of (i) the balance sheets of Healtheon
            at December 31, 1996 and December 31, 1997 and the
            statements of operations, statements of stockholders
            equity and statements of cash flows of Healtheon for
            the years ended December 31, 1996 and December 31,
            1997, which have been audited by Ernst & Young,
            independent accountants (the "HEALTHEON FINANCIAL
            STATEMENTS"),  and (ii) the 

                                     -3-
<PAGE>

            unaudited balance sheets of Healtheon at March 31, 
            1998 and the statements of operations, statements of 
            stockholders equity and statements of cash flows of 
            Healtheon for quarter ended March 31, 1998 (the 
            "HEALTHEON UNAUDITED STATEMENTS")."

                    2.5.3.2  Subsection (b) is amended by adding the phrase "and
the Healtheon Financial Statements" after the term "ActaMed Financial
Statements" wherever such term appears in such subsection, by inserting the word
"respective" prior to the phrase "financial position", by inserting the phrase
"and Healtheon" after the term "ActaMed" wherever such term appears in such
subsection, and by replacing the introduction to the final sentence, "ActaMed
has" with the introduction "ActaMed and Healtheon have".

                    2.5.3.3  Subsection (c) is amended by adding the phrase "and
the Healtheon Unaudited Statements after the term "ActaMed Unaudited
Statements", by inserting the word "respective" prior to the term "chief
financial officer", by inserting the phrase "and Healtheon" after the phase
"chief financial officer of ActaMed" and by inserting the phrase "and Healtheon
and its Subsidiaries" after the phrase "ActaMed and its Subsidiaries".

            2.5.4   CONSENTS.  Section 3.2.4 is amended by inserting the words
"or Healtheon" after the word "ActaMed" in the third line thereof, by
substituting the term "Common Stock of Healtheon" for the term "Series D
Preferred Stock" in item (b), and by deleting the parenthetical in item (b) and
the remainder of the Section following such parenthetical.

            2.5.5   CAPITALIZATION.  Section 3.2.5 is amended by substituting
the term "Common Stock of Healtheon" for the term "Series D Preferred Stock"
throughout the Section. Section 3.2.5 shall be further amended by deleting the
phrase "will have the designations, preferences, limitations and relative rights
set forth in the Articles" from subsection (b) and by deleting the final
sentence of subsection (b).

            2.5.6   REGISTRATION RIGHTS.  Section 3.2.6 is amended by
substituting the term "Investors' Rights Agreement" for "Registration Rights
Agreement," and by adding the clause "except for such securities which may be
granted registration rights pursuant to the terms of the Investors' Rights
Agreement" at the end of such Section.

            2.5.7   OFFERING.  Section 3.2.7 is amended by substituting the term
"Common Stock of Healtheon" for "Series D Preferred Stock" and by deleting the
parenthetical.

            2.5.8   CHANGES.  Section 3.2.8 is amended by adding the subsection
designation "(a)" at the beginning of such Section and by adding a new
subsection (b) as follows:

            "Since the date of the latest Healtheon Unaudited
            Statements, there has not been (i) any adverse change
            in the assets, liabilities, financial condition or
            operations of Healtheon from that reflected in the
            Healtheon Financial Statements, other than changes in
            the ordinary course of business, none of which
            individually or in the 

                                     -4-
<PAGE>

            aggregate has had a Material Adverse Effect or (ii) 
            any adverse change in the prospects of the business 
            of Healtheon or any other event or condition (or 
            events or conditions) of any character which, 
            either individually or cumulatively, has had a 
            Material Adverse Effect."

            2.5.9   FULL DISCLOSURE.  Section 3.2.25 is amended by inserting the
words "and Common Stock of Healtheon" after the term "Series D Preferred Stock."

     2.6    AUDIT.  Section 4.1.2 is amended by replacing the term "ActaMed
Common Stock" with "Common Stock of Healtheon" and by deleting the clause "on or
prior to April 30, 1998" and replacing it with the clause "in an expedient
fashion as required."

     2.7    STANDSTILL. Section 4.3.5 is replaced in its entirety by the
following:

            "4.3.5.  STANDSTILL.  At all times prior to the last
            Transfer Date, neither Healtheon nor ActaMed shall
            consummate, or enter into any agreement with respect
            to, any merger, share exchange or consolidation or sale
            of substantially all of its assets, nor shall Healtheon
            dispose of the capital stock of ActaMed, without the
            prior written consent of SBCL."

     2.8    COVENANTS TO SBCL.  Article V is replaced in its entirety by the
following:

                                     "ARTICLE V
                                          
                                 COVENANTS TO SBCL

            SECTION 5.1  ADDITIONAL COVENANTS.  ActaMed and
            Healtheon, as applicable, covenant and agree as
            follows:

                    5.1.1  TRANSACTIONS WITH AFFILIATES. For so
            long as either (i) SBCL is a stockholder of Healtheon
            or any successor to this agreement or (ii) the Services
            Agreement (or any successor agreement for Lab EDI
            Services), including all extensions and renewals
            thereof, remains in effect, Healtheon shall not,
            directly or indirectly, knowingly enter into any
            material transaction or agreement with any of its
            Affiliates, or a material transaction or agreement in
            which an Affiliate of Healtheon has a direct or
            indirect interest, unless such transaction or agreement
            is on terms and conditions no less favorable to
            Healtheon or any of its Subsidiaries than could be
            obtained at the time in an arm's length transaction
            with a third Person that is not such an Affiliate, or
            unless such transaction or agreement has been reviewed
            and approved by either a majority of those members of
            Healtheon's 

                                     -5-
<PAGE>

            Board of Directors who have no such interest in the 
            transaction or a majority of the shareholders, 
            voting in good faith.  This Section is in 
            furtherance and not in limitation of Healtheon's 
            obligations under Section 144 of the Delaware 
            Corporation Law.

                    5.1.2  CORPORATE EXISTENCE, BUSINESS,
            MAINTENANCE, INSURANCE.  For so long as the Services
            Agreement (or any successor agreement for Lab EDI
            Services), including all extensions and renewals
            thereof, remains in effect:

                           (a)  Neither Healtheon nor ActaMed will
            enter into any agreement for the disposition of all or
            substantially all of the assets used in the provision
            of Lab EDI Services, including by way of a merger,
            consolidation, share exchange, or, in the case of
            Healtheon, sale of the capital stock of ActaMed, if
            such a sale will have a material impact on the
            provision of Lab EDI Services.

                           (b)  Healtheon, either independently or
            through ActaMed, shall continue to engage in the
            business of developing information networks (with a
            meaningful focus on the provision of lab order entry
            and results reporting services as one of Healtheon's
            core businesses) and businesses related thereto.

                           (c)  ActaMed and Healtheon will maintain
            or cause to be maintained in good repair, working order
            and condition all properties used in the business of
            Healtheon and any Subsidiary related to the provision
            of Lab EDI Services and from time to time will make or
            cause to be made all appropriate repairs, renewals and
            replacements thereof.  Healtheon and any such
            Subsidiary will at all times comply in all material
            respects with the provisions of all material leases to
            which it is a party or under which it occupies property
            related to the provision of Lab EDI Services so as to
            prevent any loss or forfeiture thereof or thereunder.

                           (d)  Healtheon will maintain or cause to
            be maintained, with financially sound and reputable
            insurers, insurance in amounts approved by Healtheon's
            Board of Directors with respect to its properties and
            business and the properties and business of any
            Subsidiary against loss or damage.

            SECTION 5.2.  INFORMATIONAL COVENANTS OF HEALTHEON. 
            Healtheon covenants and agrees that it shall deliver
            the following information to SBCL so long as the
            Services Agreement remains in effect (including any
            extensions or renewal thereof) or until such time as
            Healtheon shall have consummated a Public Offering.

                                     -6-
<PAGE>

                    5.2.1.  MANAGEMENT'S ANALYSIS.  All the
            financial statements delivered pursuant to the Investor
            Rights Agreement shall be accompanied by an informal
            narrative description of material business and
            financial trends and developments and significant
            transactions that have occurred in the appropriate
            period or periods covered thereby.

                    5.2.2.  BUDGETS.  As soon as practicable, but
            in any event within thirty (30) days prior to the
            commencement of a fiscal year, an annual operating
            budget for such fiscal year, approved by the Board of
            Directors, including monthly income and cash flow
            projections and projected balance sheets as of the end
            of each quarter within such fiscal year.  Extensions of
            such due date shall not be unreasonably withheld.

                    5.2.3.  INSPECTION.  Except as provided in
            Section 5.2.5, below, upon reasonable notice, and no
            more frequently than two (2) times per year, Healtheon
            shall, and shall cause its Subsidiaries to, permit SBCL
            by its representatives, agents or attorneys:

                           (a)  to examine all books of account,
            records, reports and other papers of Healtheon or such
            Subsidiary,

                           (b)  to make copies and take extracts
            from any thereof, 

                           (c)  to discuss the affairs, finances
            and accounts of Healtheon or such Subsidiary with
            Healtheon's or such Subsidiary's officers and
            independent certified public accountants (and by this
            provision Healtheon hereby authorizes said accountants
            to discuss with SBCL and its representatives, agents or
            attorneys the finances and accounts of Healtheon or
            such Subsidiary), and

                           (d)  to visit and inspect, at reasonable
            times and on reasonable notice during normal business
            hours, the properties of Healtheon and any Subsidiary.  

            Notwithstanding any provision herein to the contrary,
            the provisions of this Section 5.2.3 are in addition to
            any rights which SBCL may have as a Healtheon
            stockholder under the Delaware Corporation Law and
            shall in no way limit such rights.

            The expenses of SBCL in connection with any such
            inspection shall be for the account of SBCL. 
            Notwithstanding the foregoing 

                                     -7-
<PAGE>

            sentence, it is understood and agreed by Healtheon 
            that all reasonable expenses incurred by Healtheon 
            or such Subsidiary, any officers, employees or 
            agents thereof or the independent certified public 
            accountants therefor, shall be expenses payable by 
            Healtheon and shall not be expenses of SBCL.

                    5.2.4  OTHER INFORMATION  Except as provided in
            Section 5.2.5 below,  for so long as SBCL continues to
            own at least [*] of the aggregate number of shares of 
            Healtheon Common Stock now or hereafter acquired by it 
            as a direct result of the Region transfers completed under 
            this Agreement, Healtheon shall deliver courtesy copies of 
            the following information, as requested by and furnished to
            the SBCL-nominated board member, or, if there is no
            such SBCL-nominated board member, as requested by the
            President of SBCL, to up to three employees of, or in-house 
            counsel to, SBCL designated by SBCL in writing
            (and who initially shall be [*]):

                           (a)  promptly after the submission
            thereof to Healtheon, copies of any detailed reports
            (including the auditors' comment letter to management,
            if any such letter is prepared) submitted to Healtheon
            by its independent auditors in connection with each
            annual or interim audit of the accounts of Healtheon
            made by such accountants;

                           (b)  promptly, and in any event within
            ten (10) days after obtaining knowledge thereof, notice
            of the institution of any suit, action or proceeding
            (other than a proceeding of general application which
            is not directly against Healtheon or one or more of its
            Subsidiaries), the happening of any event or, to the
            best knowledge of Healtheon, the assertion or threat of
            any claim against Healtheon or any of its Subsidiaries
            which, either individually or in the aggregate, would
            have a Material Adverse Effect;

                           (c)  promptly upon, and in any event
            within thirty (30) days after, obtaining knowledge
            thereof, notice of any material breach of, Default
            under or failure to comply with any material term under
            this Article V of this Agreement or any change in
            Healtheon's relationship with its major customers,
            suppliers, employees or other entity with which
            Healtheon has a business relationship if such breach
            would have a Material Adverse Effect;

[*]  CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED 
SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED 
WITH RESPECT TO THE OMITTED PORTIONS.


                                     -8-
<PAGE>

                           (d)  with reasonable promptness, a
            notice of any material default by Healtheon or any of
            its Subsidiaries under any  agreement to which it is a
            party if such breach would have a Material Adverse
            Effect;

                           (e)  with reasonable promptness, copies
            of all written materials furnished to directors;

                           (f)  promptly (but in any event within
            ten (10) days) after the filing of any document or
            material with the SEC, a copy of such document or
            material;

                           (g)  promptly after the record date set
            by the Board of Directors to determine the stockholders
            entitled to vote at Healtheon's annual meeting of
            stockholders (but in any event ten (10) days prior to
            such meeting), a list of all stockholders of Healtheon
            and their respective holdings; and

                           (h)  promptly upon request therefor,
            such other data, filings and information as the 
            SBCL-nominated Healtheon Board representative may from time
            to time reasonably request, or, if there is no such
            SBCL-nominated board member, as the President of SBCL
            may from time to time reasonably request, in either
            case to the extent consistent with Section 220 of the
            Delaware Corporation Law.

                    5.2.5  EXCLUDED INFORMATION.  Notwithstanding
            the provisions of Sections 5.2.3 and 5.2.4, SBCL shall
            not have the right to inspect, receive, review or
            otherwise have access to any information or documents
            which, in the reasonable opinion of Healtheon's counsel
            would constitute any of the following: (i) a waiver of
            the attorney-client privilege; (ii) the disclosure of
            any third-party confidential or proprietary
            information, disclosure of which is restricted by a
            written non-disclosure agreement or applicable law; or
            (iii) the disclosure of any confidential or proprietary
            information of Healtheon or any of its affiliated
            entities which relates to any areas of Healtheon's
            business, with which, in the reasonable  opinion of the
            Board of Directors of Healtheon, SBCL or its affiliates
            compete (collectively, the "Excluded Information").  

            Notwithstanding Section 5.2.4 above, in the event of a
            Change of Control of Healtheon by an Acquirer that has
            a class of securities registered under the Exchange Act
            (a "Public Company"), SBCL shall no longer have the
            information rights set forth in this Section 

                                     -9-
<PAGE>

            5.25.  In the event of a Change in Control of 
            Healtheon by an Acquirer (other than a Public 
            Company) that is a direct competitor of SBCL, SBCL 
            shall continue to have the information rights set 
            forth in Section 5.2.4, but only insofar as the 
            information to be obtained upon the exercise of 
            such rights relates to Lab EDI Services provided, 
            to be provided, or alleged by SBCL to have been 
            required to be provided, by ActaMed or Healtheon. 
            For purposes of this Section 5.2.5, a "Change of 
            Control" shall mean the sale or other transfer in a 
            single transaction or series of related 
            transactions to a person or group of affiliated 
            persons (the "Acquiror") of shares of Healtheon 
            Common Stock representing more than 50% of the 
            voting power of all Healtheon Common Stock then 
            outstanding.

            Notwithstanding the foregoing limitations of this
            Section 5.2.5, independent auditors retained by SBCL
            shall have the right to review any Excluded Information
            which, in their reasonable opinion, is necessary to
            determine or confirm (i) the amount of royalties
            payable to SBCL under the License Agreement by reason
            of connectivity between Providers and commercial
            laboratories other than SBCL Labs or (ii) the revenues
            of ActaMed for purposes of Section 1.6 hereof.

                    5.2.6  CONFIDENTIALITY OBLIGATIONS.  Subject to
            Section 4.4, all information disclosed to or obtained
            by SBCL pursuant to this Section 5.2 (including any
            Excluded Information which may be inadvertently
            disclosed to or obtained by SBCL hereunder) shall be
            deemed to be the confidential information of Healtheon
            and SBCL agrees that it shall treat such information
            with the same degree of care that it uses to protect
            its own confidential information of a similar nature
            and shall only disclose such information to those
            employees of SBCL who have a need to know such
            information in order to enforce SBCL's rights under
            this Agreement and the License Agreement.  In the event
            that SBCL obtains any copies of any Excluded
            Information, SBCL shall promptly return all copies of
            such information to Healtheon upon request or promptly
            after the SBCL employees in possession of Excluded
            Information gain actual knowledge that it is Excluded
            Information."

     2.9    SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  Section 8.1.2 is
amended by deleting the word "ActaMed" from the caption, by replacing the word
"ActaMed" with the words "ActaMed or Healtheon" throughout the Section and by
replacing the term "Series D Preferred Stock" with the term "Common Stock of
Healtheon."

                                     -10-
<PAGE>

     2.10   INDEMNITY OF SBCL.  Section 8.2.1 is amended by adding the clause
"including, without limitation, Section 5.2.6 hereof" at the end of subsection
(a)(ii).

     2.11   INDEMNITY OF ACTAMED AND HEALTHEON.  Section 8.2.2 is amended by
(i) deleting the word "ActaMed" in the caption and replacing it with the words
"ActaMed and Healtheon", (ii) by replacing the words "ActaMed agrees" in the
lead-in paragraph with the words "ActaMed and Healtheon, jointly and severally
agree," (iii) by replacing the word "ActaMed" in subsections (a)(i), (ii) and
(iii) with the words "ActaMed or Healtheon", and (iv) by adding the clause
"including, without limitation, representations and warranties made by ActaMed
prior to the Merger Effective Date" at the end of subsection (a)(i).

     2.12   SPECIAL INDEMNITY AS TO PROJECTIONS.  Section 8.2.9 is amended by
inserting the clause "as such Lab EDI Services are presently provided, without
regard to any additional expenses incurred as a result of the acquisition of
ActaMed by Healtheon" after the parenthetical "(as defined in the Services
Agreement)".

     2.13   NOTICES.  Section 11.1.1 is amended by adding the following:

               "If to Healtheon:

                    Healtheon Corp.
                    4600 Patrick Henry Drive
                    Santa Clara, CA 95054
                    Attention:  General Counsel
                    Telephone:  (408) 876-5000
                    Telecopy:   (408) 876-5175"

     2.14   ASSIGNMENT.  Section 11.1.4(b) is amended by replacing the term
"Series D Preferred Stock" with the term "Common Stock of Healtheon" and by
replacing the term "Stockholders' Agreement" with the term "Affiliate Agreement
prior to a Public Offering."

     2.15   ENTIRE AGREEMENT.  Section 11.1.8 is amended by deleting the text
after the term "SBCL."

     2.16   ADDED DEFINITIONS.  The following definitions are added to Exhibit
A to the Purchase Agreement.  If such terms are defined in said Exhibit A, the
existing definitions shall be deleted in their entirety and the following shall
replace the existing definitions:

            "Affiliate Agreement" means the ActaMed Corporation
            Affiliate Agreement, dated as of May   , 1998, between
            Healtheon and SBCL.

            "Common Stock of Healtheon" means the common stock,
            $.0001 par value, of Healtheon.

                                     -11-
<PAGE>

            "Exchange Ratio" shall have the meaning given to such
            term in the Healtheon Merger Agreement.

            "Healtheon Merger Agreement" means the Agreement and
            Plan of Reorganization, dated February 24, 1998, by and
            among Healtheon Corporation, MedNet Acquisition Corp.
            and ActaMed Corporation.

            "Investors' Rights Agreement" means the Amended and
            Restated Investors' Rights Agreement, dated as of May
            __, 1998, between Healtheon and the persons and
            entities listed on Schedules A and B thereto.

            "Material Adverse Effect" means a material adverse
            effect on the business or financial condition of either
            Healtheon or ActaMed or on the ability of either
            Healtheon or ActaMed to conduct the ActaMed Business,
            including to provide Lab EDI Services, or the
            impairment of the ability of either Healtheon or
            ActaMed to perform its respective obligations under the
            ActaMed Documents.

            "Merger Effective Date" means the date on which the
            transactions contemplated by the Healtheon Merger
            Agreement become effective.

            "New Business Plan" means for the business plan of
            ActaMed presented to SBCL on April 29, 1998, approved
            by the ActaMed board of directors on May 5, 1998 and in
            the form approved by the Healtheon board of directors
            on May 14, 1998, covering (i) for the years 1998 and
            1999, projected financial data, including statements of
            operations, and operational data, including number of
            sites and transactions per site and (ii) for the year
            2000, number of sites.

            "Public Offering" means a bona fide firm commitment
            underwritten offering of the Common Stock of Healtheon
            or the ActaMed Common Stock, as the case may be,
            pursuant to a registration statement filed with and
            declared effective by the Securities and Exchange
            Commission pursuant to the Securities Act.

     2.17   DELETED DEFINITIONS.  The definitions for the following terms set
forth in Exhibit A to the Purchase Agreement are deleted in their entirety:

            "Conversion Shares"

            "Permitted Owner"

                                     -12-
<PAGE>

            "Preferred Stock" and "Series A Preferred Stock," "Series B
            Preferred Stock" and "Series C Preferred Stock" 

            "Stock Option Plans"

3.   MISCELLANEOUS.

     3.1    ENTIRE AGREEMENT.  This Amendment No.1 constitutes the entire
understanding between the parties with respect to amendment of the Purchase
Agreement and supersedes all proposals, communications and agreements between
the parties relating to such subject matter.  No amendment, change, or waiver of
any provision of this Amendment No.1 will be binding unless in writing and
signed by all parties.

     3.2    GOVERNING LAW.  This Amendment No.1 will be governed by and
construed in accordance with the laws of the State of Georgia applicable to
contracts made and performed therein.

     3.3    PURCHASE AGREEMENT PROVISIONS.  Except as otherwise provided, all
provisions of the Purchase Agreement not modified by this Amendment No. 1 shall
remain in full force and effect.

     3.4    COUNTERPARTS.  This Amendment No. 1 may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.



                             [INTENTIONALLY LEFT BLANK]




                                     -13-
<PAGE>

            IN WITNESS WHEREOF, the parties have executed this Amendment No. 1
to the Purchase Agreement as of the date set forth above.


                                     HEALTHEON CORPORATION

                                     By:  /s/ W. Michael Long
                                        -------------------------------------
                                     Its: CEO
                                         ------------------------------------

                                     ACTAMED CORPORATION

                                     By:  /s/ Michael K. Hoover
                                        -------------------------------------
                                     Its: President & CEO
                                         ------------------------------------

                                     SMITHKLINE BEECHAM CLINICAL
                                     LABORATORIES, INC. 

                                     By:  /s/ John B. Okkersee Jr.
                                        -------------------------------------
                                     Its: President
                                         ------------------------------------



                                     -14-



<PAGE>

               CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED 
          AND FILED SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT 
               HAS BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

                                                                      EXECUTION



                                          
                                 LICENSE AGREEMENT
                                          
                                      between 
                                          
                   SMITHKLINE BEECHAM CLINICAL LABORATORIES, INC.
                                          
                                        and 
                                          
                                ACTAMED CORPORATION




                                  December 31, 1997



<PAGE>

                                 TABLE OF CONTENTS

<TABLE>
<CAPTION>

                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
ARTICLE 1 - DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 1

    1.1     ActaLab Software . . . . . . . . . . . . . . . . . . . . . . . . 1
    1.2     Affiliate. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
    1.3     Confidential Information . . . . . . . . . . . . . . . . . . . . 2
    1.4     Derivative Work. . . . . . . . . . . . . . . . . . . . . . . . . 2
    1.5     Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . 2
    1.6     Exclusive Developments . . . . . . . . . . . . . . . . . . . . . 2
    1.7     Health Care Field. . . . . . . . . . . . . . . . . . . . . . . . 2
    1.8     Information Services . . . . . . . . . . . . . . . . . . . . . . 3
    1.9     Object Code. . . . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.10    Other Lab. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.11    ProviderLink . . . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.12    [*]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.13    Providers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.14    Related Entity . . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.15    SBCL Software. . . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.16    SBCL Trademark . . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.17    SCAN Agreements. . . . . . . . . . . . . . . . . . . . . . . . . 3
    1.18    SCAN Developments. . . . . . . . . . . . . . . . . . . . . . . . 4
    1.19    Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
    1.20    Source Code. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
    1.21    Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 4
    1.22    Territory. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
    1.23    Third Party Software . . . . . . . . . . . . . . . . . . . . . . 4
    1.24    Trigger Date . . . . . . . . . . . . . . . . . . . . . . . . . . 4

ARTICLE 2 - LICENSE GRANTS; RELATED PROVISIONS . . . . . . . . . . . . . . . 4

    2.1     SCAN Development License . . . . . . . . . . . . . . . . . . . . 4
    2.2     ActaLab Development License. . . . . . . . . . . . . . . . . . . 5
    2.3     Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
    2.4     Technology Transfer. . . . . . . . . . . . . . . . . . . . . . . 6
    2.5     Royalties. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

ARTICLE 3 - SCAN DEVELOPMENTS OWNERSHIP; RELATED PROVISIONS. . . . . . . . . 6

    3.1     Ownership. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
    3.2     Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ARTICLE 4 - LICENSE BACK . . . . . . . . . . . . . . . . . . . . . . . . . . 8

    4.1     License Grant. . . . . . . . . . . . . . . . . . . . . . . . . . 8
    4.2     Term of License. . . . . . . . . . . . . . . . . . . . . . . . . 8


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -i-
<PAGE>

<S>                                                                         <C>
    4.3     Sublicenses. . . . . . . . . . . . . . . . . . . . . . . . . . . 8
    4.4     Usage Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
    4.5     ActaLab Software Escrow. . . . . . . . . . . . . . . . . . . . . 9

ARTICLE 5 - MARKINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

    5.1     By ActaMed . . . . . . . . . . . . . . . . . . . . . . . . . . .10
    5.2     By SBCL. . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

ARTICLE 6 - DEVELOPMENT AGREEMENT AMENDMENTS . . . . . . . . . . . . . . . .11

ARTICLE 7 - WARRANTIES . . . . . . . . . . . . . . . . . . . . . . . . . . .11

    7.1     Warranty of Title and Noninfringement. . . . . . . . . . . . . .11
    7.2     Authorization. . . . . . . . . . . . . . . . . . . . . . . . . .12
    7.3     Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . .12

ARTICLE 8 - INDEMNITY. . . . . . . . . . . . . . . . . . . . . . . . . . . .12

    8.1     General. . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
    8.2     Services . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
    8.3     Infringement . . . . . . . . . . . . . . . . . . . . . . . . . .13
    8.4     Claims Notice. . . . . . . . . . . . . . . . . . . . . . . . . .13
    8.5     Procedures Involving Non-Third Party Claims. . . . . . . . . . .13
    8.6     Procedures Involving Third Party Claims. . . . . . . . . . . . .14
    8.7     No Release for Fraud . . . . . . . . . . . . . . . . . . . . . .15
    8.8     Payment. . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
    8.9     Survival . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

ARTICLE 9 - LIMITATION OF LIABILITY. . . . . . . . . . . . . . . . . . . . .16

ARTICLE 10 - CONFIDENTIALITY . . . . . . . . . . . . . . . . . . . . . . . .16

ARTICLE 11 - ASSIGNMENT. . . . . . . . . . . . . . . . . . . . . . . . . . .16

    11.1    By SBCL. . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
    11.2    By ActaMed . . . . . . . . . . . . . . . . . . . . . . . . . . .17
    11.3    Other. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

ARTICLE 12 - DISPUTE RESOLUTION. . . . . . . . . . . . . . . . . . . . . . .17

    12.1    Informal Dispute Resolution. . . . . . . . . . . . . . . . . . .17
    12.2    Arbitration. . . . . . . . . . . . . . . . . . . . . . . . . . .18
    12.3    Immediate Injunctive Relief. . . . . . . . . . . . . . . . . . .19
    12.4    Jurisdiction . . . . . . . . . . . . . . . . . . . . . . . . . .19
    12.5    Continued Performance; Continuation of Licenses. . . . . . . . .19

ARTICLE 13 - MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . .20

    13.1    Further Assurances . . . . . . . . . . . . . . . . . . . . . . .20
    13.2    Integration. . . . . . . . . . . . . . . . . . . . . . . . . . .20

                                       -ii-
<PAGE>

<S>                                                                         <C>
    13.3    Force Majeure. . . . . . . . . . . . . . . . . . . . . . . . . .20
    13.4    No Agency. . . . . . . . . . . . . . . . . . . . . . . . . . . .20
    13.5    No Waiver. . . . . . . . . . . . . . . . . . . . . . . . . . . .20
    13.6    Severability . . . . . . . . . . . . . . . . . . . . . . . . . .21
    13.7    Notices. . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
    13.8    Governing Law; Interpretation. . . . . . . . . . . . . . . . . .21

</TABLE>

                                          
                                     SCHEDULES

               Schedule A          SBCL Software

               Schedule B          Amendments to Development Agreement










                                       -iii-
<PAGE>
                          CONFIDENTIAL TREATMENT REQUESTED


                                  LICENSE AGREEMENT

          THIS LICENSE AGREEMENT ("License Agreement") dated December 31, 1997
(the "Effective Date") is by and between SMITHKLINE BEECHAM CLINICAL
LABORATORIES, INC., a Delaware corporation ("SBCL") and ACTAMED CORPORATION, a
Georgia corporation ("ActaMed").

          WHEREAS, SBCL and ActaMed have entered into an Assets Purchase
Agreement dated of even date herewith (the "Purchase Agreement") pursuant to
which ActaMed has agreed to purchase certain assets owned by SBCL and used to
provide certain services to health care service providers;

          WHEREAS, the Purchase Agreement contemplates that the parties will
enter into a license agreement substantially on the terms set forth herein, as
well as a Services Agreement (the "Services Agreement") pursuant to which
ActaMed shall provide certain services to SBCL and to health care service
providers;

          WHEREAS, SBCL and ActaMed have previously entered into a Development
Agreement dated October 31, 1997 (the "Development Agreement") pursuant to which
ActaMed agreed to perform certain development services; and

          WHEREAS, the parties desire to amend the provisions of the Development
Agreement pursuant to which SBCL authorized ActaMed to use SBCL software and
related materials in the performance of work under the Development Agreement,
and pursuant to which the parties allocated ownership of deliverables created
under the Development Agreement and intellectual property rights therein;

          NOW THEREFORE, in consideration of the foregoing premises and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, and intending to be legally bound, SBCL and ActaMed agree as
follows:

                             ARTICLE 1  - DEFINITIONS

1.1    "ACTALAB SOFTWARE" means (i) any updated, upgraded, corrected, modified,
       or enhanced version of ProviderLink created by or for ActaMed, and any
       Derivative Works made from ProviderLink by or for ActaMed, and any other
       Software owned and employed by ActaMed in providing Information Services
       or related services in accordance with the terms of the Services
       Agreement, in each case embodying, incorporating or practicing the SBCL
       Software or any portion thereof, (ii) any compiler or other program
       reasonably required to create Object Code from the Source Code of the
       foregoing or use any of the foregoing in the provision of Information 
       Services, and (iii) any Documentation relating to any of the 

<PAGE>

       foregoing created by or for ActaMed.  Without limiting the foregoing, 
       "ActaLab Software" shall include [*] (as the term is defined in the 
       Services Agreement).

1.2    "AFFILIATE" of an entity means a company or other person controlling,
       controlled by or under common control with such entity.

1.3    "CONFIDENTIAL INFORMATION" means any and all proprietary information
       disclosed or made available by a party hereto to the other party
       pursuant to this License Agreement, whether in written, oral, magnetic,
       photographic, optical or other form and whether now existing or
       hereafter created, including, without limitation, all trade secrets,
       know-how, information systems, technology, data, computer programs,
       processes, methods, operational procedures, plans, strategies or
       results, and other information of a similar nature that is not generally
       disclosed by such party to the public.  Without limiting the foregoing,
       ActaMed's Confidential Information shall include the Source Code and
       Documentation for the ProviderLink Software and ActaLab Software, and
       SBCL's Confidential Information shall include the Source Code and
       Documentation for the SBCL Software and the SCAN Developments. 
       Confidential Information shall not include any information which (a) is
       proven by written evidence to have been in the receiving party's
       possession prior to disclosure by the other party; (b) is received from
       a third party having the right to disclose such information; (c) is or
       hereafter becomes public knowledge through no act or fault of the
       receiving party; or (d) is proven by written evidence to have been
       independently developed by the receiving party without access to the
       Confidential Information of the other party.

1.4    "DERIVATIVE WORK" means a work that is based upon one or more
       preexisting works, such as a revision, modification, translation,
       abridgment, condensation, expansion, or any other form in which such
       preexisting works may be recast, transformed, translated or adapted, and
       that, if prepared without authorization of the owner of the copyright in
       such preexisting work, would constitute a copyright infringement.  

1.5    "DOCUMENTATION" means manuals (e.g., user, utility reference and
       language reference) and other written materials that relate to
       particular Software, including materials useful for the operation of the
       Software by a user (collectively, "USER DOCUMENTATION"), and information
       (e.g., data flows, data structures, control logic, flow diagrams, and
       principles of operation) useful for design, modification and maintenance
       of the Source Code by a programmer (collectively, "PROGRAMMER
       DOCUMENTATION").

1.6    "EXCLUSIVE DEVELOPMENTS" shall have the meaning ascribed to it by
       Section V.E of the Services Agreement.

1.7    "HEALTH CARE FIELD" means the provision of electronic data interchange
       technology relating to patients, patient-related services or the
       practice of medicine, to Providers, Healthcare Payors and Healthcare
       Administrators.  "Healthcare Payor," for the purposes of this
       definition, means any person or entity that pays for the provision of
       healthcare services, 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -2-
<PAGE>

       including without limitation employers, insurance companies, 
       regional healthcare alliances, and federal, state and local 
       governmental agencies.  "Healthcare Administrator" means those 
       entities engaged in the administration of healthcare services, 
       including without limitation managed care companies, utilization 
       review companies and third party administrators. Notwithstanding 
       the foregoing, "Health Care Field" shall exclude services relating 
       to or provided to [*].

1.8    "INFORMATION SERVICES" means the transmission of orders for laboratory
       tests and/or laboratory test results and reports.

1.9    "OBJECT CODE" means the form of Software resulting from the translation
       or processing of the Source Code by a computer into machine language or
       intermediate code in a form that is not convenient to human
       understanding but which is appropriate for execution or interpretation
       by a computer, together with related User Documentation.

1.10   "OTHER LAB" shall have the meaning ascribed to it by the Services
       Agreement.

1.11   "PROVIDERLINK" means the ActaMed proprietary Software known as
       ProviderLink as it exists on the Effective Date, together with any
       updates, upgrades, enhancements, modifications or Derivative Works made
       thereto or therefrom by or for ActaMed other than under the licenses
       granted by this License Agreement, and the Specifications and
       Documentation relating to and of the foregoing prepared by or for
       ActaMed.

1.12   [*].

1.13   "PROVIDERS" means physicians, clinics, hospitals and other providers of
       clinical health care services other than [*].

1.14   "RELATED ENTITY" means an entity that is engaged in the laboratory
       testing business and in which SBCL or an SBCL affiliate has a legal or
       beneficial ownership of ten percent (10%) or more.

1.15   "SBCL SOFTWARE" means the Software described in Schedule A hereto. 
       "SBCL Software" shall in no event be construed to include [*] or Third 
       Party Software.

1.16   "SBCL TRADEMARK" means SBCL's trade names, logos, trademarks, trade
       devices, product names and/or service marks.

1.17   "SCAN AGREEMENTS" means the Development Agreement, Purchase Agreement,
       Services Agreement and this License Agreement.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -3-
<PAGE>

1.18   "SCAN DEVELOPMENTS" means (i) any updated, upgraded, corrected,
       modified, or enhanced version of the SBCL Software created by or for
       ActaMed under the rights granted by this License Agreement, and (ii) any
       Documentation relating to any of the foregoing created by or for
       ActaMed, provided, that SCAN Developments shall in no event be construed
       to include the ActaLab Software.  

1.19   "SOFTWARE" means computer programming code consisting of Object Code
       and/or Source Code and/or associated procedural code, as applicable,
       including updates and revisions thereto.

1.20   "SOURCE CODE" means program instructions and codes written by humans
       with the intention that the instructions and codes be compiled and
       interpreted by a computer, including all existing commentary,
       explanations, control procedures, record layouts for all files and
       program listings-source codes, design documentation, user manuals,
       programmers' guides, system guides, current compilation instructions,
       and all other User Documentation and Programmer Documentation.

1.21   "SPECIFICATIONS" means a description of the design, operating
       procedures, performance, functions and other requirements for Software.

1.22   "TERRITORY" means the United States of America, including all
       territories and possessions thereof.

1.23   "THIRD PARTY SOFTWARE" means Software that SBCL prior to the Effective
       Date licensed from third parties for use in delivery of automated order
       entry and results reporting services, including without limitation
       Software known as [*] and [*].

1.24   "TRIGGER DATE" shall have the meaning ascribed to it by Section 4.4.1
       hereof.

                  ARTICLE 2 - LICENSE GRANTS; RELATED PROVISIONS

2.1    SCAN DEVELOPMENT LICENSE.  Subject to the terms and conditions of this
       License Agreement, SBCL hereby grants ActaMed a perpetual, irrevocable,
       nonexclusive, non-transferable (except as otherwise expressly set forth
       herein) right and license in the Health Care Field in the Territory to:

       2.1.1   possess and use the SBCL Software to update, upgrade, enhance,
               modify and create Derivative Works from the SBCL Software and
               otherwise create SCAN Developments; and 

       2.1.2   possess and use, update, upgrade, enhance, modify and create
               Derivative Works from the SBCL Software, SCAN Developments and
               ActaLab Software; 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -4-
<PAGE>

       2.1.3   possess and use the SBCL Software and SCAN Developments for the
               purposes of performing ActaMed's obligations under the SCAN
               Agreements; and

       2.1.4   possess and use the SCAN Developments for the purpose of
               providing Information Services in support of the laboratory
               testing services offered by Other Labs only to the extent such
               SCAN Developments do not constitute Exclusive Developments under
               the Service Agreement.

       The foregoing license shall include the right to (i) sublicense the SBCL
       Software and/or SCAN Developments to one or more contractors performing
       the activities described in Sections 2.1.1 or 2.1.2 hereof for ActaMed's
       benefit and for ActaMed's account, and (ii) sublicense Providers, [*]
       and Other Labs to use the Object Code version of the SBCL Software
       and/or the SCAN Developments as ActaMed reasonably determines necessary
       or appropriate in connection with its provision of the services
       contemplated by Section 2.1.3, in each case provided that each
       sublicensee executes a written agreement (x) prohibiting such
       sublicensee from disclosing SBCL Confidential Information or using the
       same other than as contemplated by this Section 2.1, and (y) precluding
       the sublicensee or any of its employees or agents from gaining or
       holding any right or interest in the SBCL Software. 

2.2    ACTALAB DEVELOPMENT LICENSE

       2.2.1   GRANT.  Subject to the terms and conditions of this License
               Agreement, SBCL hereby grants ActaMed a perpetual, irrevocable,
               nonexclusive, non-transferable (except as otherwise expressly set
               forth herein) right and license to possess and use the SBCL
               Software to update, upgrade, enhance, modify and create
               Derivative Works from ProviderLink and otherwise create ActaLab
               Software pursuant to the Development Agreement and otherwise. 
               The license granted by this Section 2.2.1 shall survive the
               termination of this License Agreement.

       2.2.2   OWNERSHIP.  Ownership of Deliverables (as defined by the
               Development Agreement) relative to the ActaLab Software shall be
               governed by Section 5 of the Development Agreement, as amended. 
               Ownership of all other ActaLab Software and all intellectual
               property rights therein (including but not limited to copyrights
               and all renewals and extensions thereof) shall vest in ActaMed,
               except that nothing in this Agreement shall be construed to
               transfer to ActaMed, or otherwise divest SBCL of SBCL's ownership
               of, the SBCL Software or SCAN Developments or the patents,
               copyrights, trade secrets and other intellectual property rights
               therein.  ActaMed shall own the ActaLab Software Exclusive
               Developments.

2.3    CONDITIONS.  

       2.3.1   As a material inducement for SBCL's grant of the licenses
               contemplated by this Agreement and the amendments to the 
               Development Agreement contemplated by 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -5-
<PAGE>

               Article 6 of this Agreement, ActaMed hereby covenants and 
               agrees that, except as SBCL may authorize in writing, ActaMed 
               (and any sublicensee of ActaMed) shall use the ActaLab 
               Software solely within the Territory and solely in the Health 
               Care Field. 

       2.3.2   ActaMed further covenants and agrees that, except as SBCL may
               otherwise agree in writing, ActaMed shall not use or license the
               use of the ActaLab Software Exclusive Developments for the
               benefit of any party other than in support of SBCL's laboratory
               testing services.

2.4    TECHNOLOGY TRANSFER.  SBCL, within thirty (30) days following the
       Effective Date, shall provide ActaMed with one copy of all currently
       existing SBCL Software not previously provided in connection with the
       Development Agreement or otherwise.  Thereafter, during the term of the
       Services Agreement, SBCL shall promptly provide ActaMed with such
       updates, upgrades and enhancements to the SBCL Software as SBCL, in its
       sole discretion, may make or have made during the term of the Services
       Agreement.

2.5    ROYALTIES.  

       2.5.1   If ActaMed uses the SBCL Software, SCAN Developments or ActaLab
               Software in the provision of Information Services to [*] ActaMed
               shall agree to pay SBCL a royalty equal to [*] of Royalty 
               Revenues for the Royalty Period applicable to such [*].  "Royalty
               Revenues," for these purposes, means the [*] ActaMed collects for
               such Information Services.  The "Royalty Period," with respect to
               Software or services provided in support of a given [*] means 
               the [*] period commencing on the date [*].

       2.5.2   The royalties accruing pursuant to this Section 2.4 shall be
               payable on a [*] basis, and shall be due within [*] days 
               following the end of the [*] in which they accrue.  Each such 
               royalty payment shall be accompanied by a report showing, by each
               [*] the total Royalty Revenue collected during the applicable 
               [*] and the royalty amount due in respect of such Royalty 
               Revenue.

            ARTICLE 3 - SCAN DEVELOPMENTS OWNERSHIP; RELATED PROVISIONS

3.1    OWNERSHIP.  

       3.1.1   Subject to the provisions of Section 3.2 hereof, SBCL, as between
               ActaMed and SBCL, shall have sole and exclusive ownership in and
               title to the SBCL Software and SCAN Developments, including all
               intellectual property rights therein.  Without limiting the
               foregoing, the SCAN Developments shall be "works made for hire"
               for 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -6-
<PAGE>

               the benefit of SBCL.  To the extent that any of the SCAN
               Developments, by operation of law, may not be works made for
               hire, or to the extent ActaMed otherwise would retain any rights
               in the SCAN Developments, ActaMed, subject to the provisions of
               Section 3.2.2 hereof, hereby assigns to SBCL the ownership of any
               patent or copyright in the SCAN Developments and SBCL shall have
               the right to obtain and hold in its own name copyrights, patents,
               registrations and similar protections which may be available with
               respect to the SCAN Developments. 

       3.1.2   Nothing in this Agreement shall be construed to transfer to SBCL,
               or otherwise divest ActaMed of ActaMed's ownership of,
               ProviderLink, the ActaLab Software or the patents, copyrights,
               trade secrets and other intellectual property rights therein,
               provided, that, subject to the provisions of Section 3.2.1
               hereof, ActaMed hereby grants SBCL a perpetual, nonexclusive,
               royalty-free license (with right of sublicense) under such
               intellectual property rights to use, possess, update, upgrade,
               enhance, modify, reproduce, market, distribute and sell the SCAN
               Developments.

       3.1.3   ActaMed shall provide SBCL with the Source Code for the SCAN
               Developments on or before the first release of the same to a
               commercial customer or the use of the same in providing a
               commercial service (the "Release Date") and, thereafter, on or
               before the Release Date of any updates, upgrades, enhancements or
               modifications thereto and, in any event, [*] during the term of 
               the Services Agreement (including any renewal terms thereof).

3.2    LIMITATIONS.  

       3.2.1   SBCL covenants and agrees that, prior to the expiration or
               termination of the Services Agreement, it shall not use, or
               sublicense any other party to use, the SCAN Developments except
               (i) in the Territory solely for the purpose of performing
               Information Services in support of the laboratory testing
               services offered [*] that has not been transferred to ActaMed
               pursuant to the Purchase Agreement, and (ii) outside of the
               Territory.  In the event SBCL uses the SCAN Developments to
               provide Information Services in support of [*] within the
               Territory, SBCL shall pay ActaMed a usage fee to be negotiated by
               the parties, such usage fee to be determined in accordance with
               the provisions, and during the term, of the Services Agreement.

       3.2.2   Except to the extent such SCAN Developments constitute Exclusive
               Developments, nothing in this Agreement shall be construed to (i)
               grant SBCL or any other party ownership of such portions of the
               SCAN Developments as are devoted solely to the process of
               checking patient eligibility for third party payor benefits or
               reimbursement, or claim status checking (collectively,
               "Eligibility Services"), or (ii) grant SBCL any right or license
               to use the SCAN Developments for the purposes of performing or
               providing Eligibility Services, except that SBCL shall not be
               required to delete or 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -7-

<PAGE>

               remove the Eligibility Code from the SCAN Developments prior 
               to exercising the rights and licenses granted by this Article 
               3.

                               ARTICLE 4 - LICENSE BACK

4.1    LICENSE GRANT.  Subject to the provisions of this Article 4, ActaMed
       hereby grants SBCL an irrevocable, nonexclusive, non-transferable
       (except as expressly set forth herein) right and license in the
       Territory in the Health Care Field to:

       4.1.1   possess and use the ActaLab Software to create [*] and update,
               upgrade, modify, enhance and create Derivative Works from [*] 
               (such Derivative Works being referred to herein as the [*]) as 
               SBCL reasonably determines necessary to perform Information 
               Services in support of laboratory test services offered by SBCL
               and/or Related Entities, including without limitation to ensure
               compliance with laws and regulations applicable to the business
               of SBCL and Related Entities, PROVIDED, that SBCL covenants and
               agrees that it shall not exercise the licenses granted by this 
               Section 4.1.1 prior to the earlier of [*] (the "Trigger Date");
               and

       4.1.2   possess and use [*] and [*] for internal business purposes of 
               SBCL and Related Entities, including without limitation the 
               provision of Information Services to Providers in support of 
               their respective laboratory testing services, PROVIDED, that 
               SBCL covenants and agrees that it shall not exercise the licenses
               granted by this Section 4.1.2 prior to the date on which the 
               Services Agreement expires as a result of ActaMed's notice of 
               nonrenewal or the date on which the Services Agreement terminates
               for ActaMed's breach, as applicable.

4.2    TERM OF LICENSE.  The licenses granted by this Article 4 shall expire on
       the second anniversary of the date on which SBCL first uses ActaLabSB on
       a commercial basis in support of SBCLs laboratory testing services.

4.3    SUBLICENSES.  The licenses granted by Section 4.1 shall include the
       right to (a) sublicense the ActaLab Software, and [*] to one or more 
       contractors performing any of the foregoing for the benefit and account
       of SBCL or a Related Entity, and (b) sublicense Providers to use the 
       Object Code version of [*] as reasonably may be required to provide the
       services contemplated by Section 4.1.2, in each case provided that each 
       sublicensee executes a written agreement (x) prohibiting such sublicensee
       from disclosing ActaMed Confidential Information or using the same other
       than as contemplated 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -8-
<PAGE>

       by this Article 4, and (y) precluding the sublicensee or any of 
       its employees or agents from gaining or holding any right or 
       interest in the ActaLab Software.

4.4    USAGE FEES.

       4.4.1   SBCL, in addition to the other consideration contemplated by the
               SCAN Agreements, agrees to pay, as a royalty, a Usage Fee on each
               Royalty Transaction.  For the purposes of this Section 4.4.1:

                 (i)  "Royalty Transaction" means a Requisition (as defined in
                      the Services Agreement) entered [*] (pursuant to Sections
                      XII.E.1.b or XII.E.3.c. of the Services Agreement) to or 
                      for a site other than one of the Permitted Number of 
                      sites.

                (ii)  "Usage Fee" means the lesser of (i) [*] per Requisition 
                      and [*] of the Transaction Fee then prevailing under 
                      Article IV of the Services Agreement or (ii) [*] of an 
                      amount competitive with the market for Information
                      Services, such amount [*] to be calculated in accordance
                      with the principles established by Section IV of the
                      Services Agreement. 

               (iii)  "Permitted Number" means [*] the number of sites [*] the
                      largest number of sites with respect to which [*].

       4.4.2   The royalties accruing pursuant to this Section 4.4 shall be
               payable on a [*] and shall be due within [*] days following the
               end of the [*] in which they accrue.  Each such royalty payment
               shall be accompanied by a report showing the manner in which the
               payment amount was calculated.

4.5    ACTALAB SOFTWARE ESCROW.  

       4.5.1   Promptly upon the execution of this License Agreement, ActaMed
               shall give written notice to Fort Knox Escrow Services, Inc.
               ("Fort Knox") instructing Fort Knox to add SBCL to the list of
               Licensees maintained pursuant to that certain Master Escrow
               Agreement dated February 20, 1995 (the "Escrow Agreement"). 
               ActaMed shall deposit the Source Code for all ActaLab Software in
               accordance with the terms of the Escrow Agreement on or before
               the first release of the same to a commercial customer or the use
               of the same in providing a commercial service (the "Release
               Date") and, thereafter, on or before the Release Date of any
               updates, upgrades, 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -9-
<PAGE>

               enhancements or modifications thereto and, in any event, no 
               less often than once [*] during the term of the Services 
               Agreement (including any renewal terms thereof).  
               
       4.5.2   ActaMed, within thirty (30) days of the date of this Agreement
               shall enter into an amendment to the Escrow Agreement with Fort
               Knox, reasonably acceptable to SBCL in form and substance, to the
               effect that Fort Knox, at SBCL's request and expense, agrees to
               inspect the deposit materials supplied by ActaMed for the purpose
               of confirming their identity and completeness. 

       4.5.3   ActaMed, promptly upon SBCL's demand made at any time following
               the Trigger Date, shall notify Fort Knox in accordance with
               Section 4.1(a) of the Escrow Agreement to deliver the Source Code
               for the ActaLab Software to SBCL, which notice shall be
               accompanied by the fees specified in such Section 4.1(a).  

       4.5.4   ActaMed covenants and agrees to maintain the Escrow Agreement in
               full force and effect during the term of the Services Agreement,
               and acknowledges that its failure to do so will constitute a
               material breach of this License Agreement and the Services
               Agreement.

       4.5.5   ActaLab hereby appoints SBCL as its attorney in fact for the
               limited purpose of providing to Fort Knox the notices
               contemplated by this Section 4.4.1 and 4.4.3.

                                 ARTICLE 5 - MARKINGS

5.1    BY ACTAMED.  ActaMed shall reproduce SBCLs copyright notice on all SBCL
       Software and SCAN Developments in accordance with the practice
       prevailing in the software industry.  Subject to the foregoing sentence:

       5.1.1   ActaMed, on or before the date on which ActaMed switches any site
               from the SBCL gateway to the ActaMed gateway (as described in
               Section II.B of the Services Agreement), shall remove SBCL
               Trademarks from the sign-on screen for the ActaLab Software and
               SCAN Developments resident on the computer at such site, and from
               any other screens that might reasonably suggest that SBCL, rather
               than ActaMed, is the source of the Information Services provided
               using such Software; and 

       5.1.2   ActaMed, with the reasonable assistance of SBCL's Distribution
               Service Representatives in accordance with Section II.B.4 of the
               Services Agreement, shall remove SBCL Trademarks from any
               equipment owned or controlled by ActaMed and located at a given
               site within three (3) months of the Transfer Date for such site,
               but in any event prior to the date on which ActaMed transfers
               ownership of such equipment to any other party. 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -10-
<PAGE>

5.2    BY SBCL.  SBCL shall reproduce ActaMeds copyright notice on all copies
       of the ActaLab Software in accordance with the practice prevailing in
       the software industry.

                     ARTICLE 6 - DEVELOPMENT AGREEMENT AMENDMENTS

The parties hereby agree to amend the Development Agreement as set forth in
Schedule B hereto. 

                        ARTICLE 7 - WARRANTIES

7.1    WARRANTY OF TITLE AND NONINFRINGEMENT.

       7.1.1   ActaMed represents and warrants to SBCL that:

                 (i)  Unless ActaMed provides SBCL with advance written notice
                      to the contrary in accordance with Section 5.2(b) of the
                      Development Agreement, ActaMed is and will be the sole
                      author of all works used by ActaMed in preparing the
                      ActaLab Software and SCAN Developments;

                (ii)  ActaMed shall require all officers, employees,
                      contractors, representatives and agents who provide
                      services with respect to the ActaLab Software, SBCL
                      Software or SCAN Developments under the SCAN Agreements
                      to assign to ActaMed all intellectual property rights
                      created or arising therein;

               (iii)  Subject to the provisions of Section 7.1.2 hereof,
                      ActaMed has and will have full and sufficient right in
                      the ActaLab Software to grant the licenses and rights
                      contemplated by Article 4 of this License Agreement, free
                      and clear of any liens, claims or encumbrances; 

                (iv)  Subject to the provisions of Section 7.1.2 hereof, the
                      terms and conditions set forth in Article 3 hereof are
                      sufficient to convey to SBCL all right, title and
                      interest in and to the SCAN Developments, and following
                      such conveyance neither ActaMed nor any third party shall
                      retain any right, title or interest in the SCAN
                      Developments other than the licenses expressly set forth
                      herein; and

                 (v)  Subject to the provisions of Section 7.1.2 hereof, none
                      of the ActaLab Software or SCAN Developments infringes
                      any patents, copyrights, trademarks, or other
                      intellectual property rights (including trade secrets),
                      privacy or similar rights of any third party, nor has any
                      claim of such infringement been threatened or asserted.

                                       -11-
<PAGE>

       7.1.2   SBCL represents and warrants to ActaMed that:

                 (i)  SBCL is the sole author of the SBCL Software;

                (ii)  SBCL has required all officers, employees, contractors,
                      representatives and agents who prior to the date of this
                      Agreement provided services with respect to the Software
                      to assign to SBCL all intellectual property rights
                      created or arising therein;

               (iii)  SBCL has and will have full and sufficient right in the
                      SBCL Software to grant the licenses and rights
                      contemplated by Article 2 of this License Agreement, free
                      and clear of any liens, claims or encumbrances; and

                (iv)  none of the SBCL Software provided to ActaMed by SBCL
                      hereunder infringes any patents, copyrights, trademarks,
                      or other intellectual property rights (including trade
                      secrets), privacy or similar rights of any third party,
                      nor has any claim of such infringement been threatened or
                      asserted.

7.2    AUTHORIZATION.  Each of ActaMed and SBCL represents and warrants that,
       as of the Effective Date of this License Agreement (i) it is duly
       authorized to enter into this License Agreement, and (ii) it is free of
       any obligation or restriction that would prevent it either from entering
       into or performing this License Agreement.

7.3    DISCLAIMERS.  THE FOREGOING WARRANTY IS IN LIEU OF ANY OTHER WARRANTY,
       EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES
       OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WHICH ARE HEREBY
       SPECIFICALLY EXCLUDED AND DISCLAIMED.  WITHOUT LIMITING THE FOREGOING,
       (i) NOTHING IN THIS LICENSE AGREEMENT SHALL BE CONSTRUED TO EXPAND OR
       EXTEND THE WARRANTIES ACTAMED GRANTS IN THE OTHER SCAN AGREEMENTS WITH
       RESPECT TO THE ACTALAB SOFTWARE OR SCAN DEVELOPMENTS, AND (ii) SUBJECT
       TO SUCH WARRANTIES AND REPRESENTATIONS AS ARE CONTAINED IN THE OTHER
       SCAN AGREEMENTS, ACTAMED ACKNOWLEDGES THAT SBCL IS LICENSING THE SBCL
       SOFTWARE TO ACTAMED ON AN AS IS BASIS, AND HEREBY DISCLAIMS ANY
       WARRANTIES WITH RESPECT TO THE OPERATION THEREOF.

                                ARTICLE 8 - INDEMNITY

8.1    GENERAL. Each party hereto shall indemnify, defend and hold harmless the
       other party and its officers, employees, representatives and agents
       against any and all damages, losses, or expenses suffered or paid as a
       result of any claims, demands, suits, causes of action, 

                                       -12-
<PAGE>

       proceedings, awards, judgments, and liabilities (including 
       reasonable attorneys fees) incurred in litigation, arbitration 
       or otherwise, assessed, incurred, or sustained (each, a Claim) 
       with respect to or arising out of the breach by the 
       Indemnifying Party of any representation, warranty, covenant 
       or agreement made herein. 

8.2    SERVICES.  ActaMed shall indemnify, defend and hold harmless SBCL and
       its officers, employees, representatives and agents against any Claim
       arising from or relating to ActaMeds provision of the ActaLab Software,
       SCAN Developments or any services, in each case in support of any Other
       Lab pursuant to this License Agreement.  SBCL shall indemnify, defend
       and hold harmless ActaMed and its officers, employees, representatives
       and agents against any Claim arising from or relating to SBCLs provision
       of the SCAN Developments or any services outside the Territory or to [*]
       as contemplated by Section 3.2 hereof.

8.3    INFRINGEMENT.  

       8.3.1   ActaMed, subject to the provisions of Section 8.3.2 hereof, shall
               indemnify, defend and hold harmless SBCL and the Related Entities
               and their respective officers, employees, representatives and
               agents against any Claim alleging the ActaLab Software or any
               SCAN Development infringes or constitutes misappropriation of any
               U.S. or foreign patent or any other U.S. or foreign proprietary
               right of a third party. 

       8.3.2   SBCL shall indemnify, defend and hold harmless ActaMed and its
               Affiliates and their respective officers, employees,
               representatives and agents against any Claim alleging the SBCL
               Software infringes or constitutes misappropriation of any U.S. or
               foreign patent or any other U.S. or foreign proprietary right of
               a third party. 

8.4    CLAIMS NOTICE.  A Claim shall be made by any entity or individual
       eligible for indemnification pursuant to this Article 8 (an Indemnitee)
       by delivery of a Claims Notice to the party owing a duty of
       indemnification under this Article 8 (the Indemnifying Party) requesting
       indemnification and specifying the basis on which indemnification is
       sought and the amount of asserted Losses (as defined in the Services
       Agreement) and, in the case of a Third Party Claim (as defined in the
       Services Agreement), containing (by attachment or otherwise) such other
       information as such Indemnitee shall have concerning such Third Party
       Claim.  

8.5    PROCEDURES INVOLVING NON-THIRD PARTY CLAIMS.  If the Claim involves a
       matter other than a Third Party Claim, the Indemnifying Party shall
       raise any objection to such Claim within a reasonable period of time by
       delivery of a written notice of such objection to such Indemnitee
       specifying in reasonable detail the basis for such objection.  If an
       objection is timely interposed by the Indemnifying Party, the
       Indemnifying Party and the Indemnitee shall cooperate in the compromise
       of the Claim or resolve any disagreement in accordance with Article 12
       hereof.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -13-
<PAGE>

8.6    PROCEDURES INVOLVING THIRD PARTY CLAIMS.  The obligations and
       liabilities of the parties hereunder with respect to a Third Party Claim
       shall be subject to the following terms and conditions:

       8.6.1   The Indemnitee shall give the Indemnifying Party written notice
               of a Third Party Claim promptly after receipt by the Indemnitee
               of notice thereof, and the Indemnifying Party may undertake the
               defense, compromise and settlement thereof by representatives of
               its own choosing reasonably acceptable to the Indemnitee.  The
               failure of the Indemnitee to notify the Indemnifying Party of
               such claim shall not relieve the Indemnifying Party of any
               liability that they may have with respect to such claim except to
               the extent the Indemnifying Party demonstrates that the defense
               of such claim is prejudiced by such failure.  The assumption of
               the defense, compromise and settlement of any such Third Party
               Claim by the Indemnifying Party shall be an acknowledgment of the
               obligation of the Indemnifying Party to indemnify the Indemnitee
               with respect to such claim hereunder.  If the Indemnitee desires
               to participate in, but not control, any such defense, compromise
               and settlement, it may do so at its sole cost and expense.  If,
               however, the Indemnifying Party fails or refuses to undertake the
               defense of such Third Party Claim within ten (10) days after
               written notice of such claim has been given to the Indemnifying
               Party by the Indemnitee, the Indemnitee shall have the right to
               undertake the defense, compromise and settlement of such claim
               with counsel of its own choosing.  In the circumstances described
               in the preceding sentence, the Indemnitee shall, promptly upon
               its assumption of the defense of such claim, make a Claim as
               specified in Section 8.3 which shall be deemed a Claim that is
               not a Third Party Claim for the purposes of the procedures set
               forth herein.

       8.6.2   If, in the reasonable opinion of the Indemnitee, any Third Party
               Claim or the litigation or resolution thereof involves an issue
               or matter which could have a material adverse effect on the
               business, operations, assets, properties or prospects of the
               Indemnitee, the Indemnitee shall have the right to control the
               defense, compromise and settlement of such Third Party Claim
               undertaken by the Indemnifying Party, and the reasonable costs
               and expenses of the Indemnitee in connection therewith shall be
               included as part of the indemnification obligations of the
               Indemnifying Party hereunder.  If the Indemnitee shall elect to
               exercise such right, the Indemnifying Party shall have the right
               to participate in, but not control, the defense, compromise and
               settlement of such Third Party Claim at its sole cost and
               expense.

       8.6.3   No settlement of a Third Party Claim involving the asserted
               liability of the Indemnifying Party under this Article shall be
               made without the prior written consent by or on behalf of the
               Indemnifying Party, which consent shall not be unreasonably
               withheld or delayed.  If the Indemnifying Party assumes the
               defense of such a Third Party Claim, (1) no compromise or
               settlement thereof may be effected by the Indemnifying Party
               without the Indemnitee's consent unless (a) there is no finding
               or 

                                       -14-
<PAGE>

               admission of any violation of law or any violation of the
               rights of any person and no effect on any other claim that may be
               made against the Indemnitee (b) the sole relief provided is
               monetary damages that are paid in full by the Indemnifying Party
               and (c) the compromise or settlement includes, as an
               unconditional term thereof, the giving by the claimant or the
               plaintiff to the Indemnitee of a release, in form and substance
               satisfactory to the Indemnitee, from all liability in respect of
               such Third Party Claim, and (2) the Indemnitee shall have no
               liability with respect to any compromise or settlement thereof
               effected without its consent.

8.7    NO RELEASE FOR FRAUD.  Nothing contained in this Agreement shall relieve
       or limit the liability of a party or any officer or director of such
       party from any Liability arising out of or resulting from common law
       fraud or intentional misrepresentation in connection with the
       transactions contemplated by this Agreement or in connection with the
       delivery of this Agreement.  Each ActaMed Indemnitee or SBCL Indemnitee,
       as the case may be, shall have a right to indemnification for any Loss
       incurred as the result of any common law fraud or intentional
       misrepresentation by SBCL or ActaMed, respectively, or any officer or
       director thereof.

8.8    PAYMENT.  

       8.8.1   If any party is required to make any payment under this Article
               8, such party shall promptly pay the Indemnified Party the amount
               so determined.  If there is a dispute as to the amount or manner
               of determination of any indemnity obligation owed under this
               Article 8, the Indemnifying Party shall nevertheless pay when due
               such portion, if any, of the obligation as shall not be subject
               to dispute.  The difference, if any, between the amount of the
               obligation ultimately determined as properly payable under this
               Article 8 and the portion, if any, theretofore paid shall bear
               interest as set forth in Section 8.8.3 hereof.

       8.8.2   Any items as to which an Indemnified Party is entitled to payment
               under this Article may be paid by set off against amounts payable
               to the Indemnifying Party to the extent that such amounts are
               sufficient to pay such items.

       8.8.3   If all or part of any indemnification obligation under this
               Agreement is not paid when due, then the Indemnifying Party shall
               pay the Indemnified Party interest on the unpaid principal amount
               of the obligation from the date the amount became due until
               payment in full, at the per annum rate of interest announced from
               time to time by NationsBank South, N.A., to be its "prime rate."

8.9    SURVIVAL.  The provisions of this Article 8 shall survive the
       termination of this License Agreement.

                                       -15-
<PAGE>

                         ARTICLE 9 - LIMITATION OF LIABILITY

NEITHER PARTY SHALL BE LIABLE TO THE OTHER PARTY IN TORT, CONTRACT OR OTHERWISE
FOR ANY LOST PROFITS, SPECIAL, INDIRECT, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL
DAMAGES ARISING OUT OF, OR IN CONNECTION WITH THIS LICENSE AGREEMENT THAT THE
OTHER PARTY, OR ANY THIRD PARTY, MAY INCUR, EXPERIENCE OR CLAIM, EVEN IF THE
PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH CLAIM.

                             ARTICLE 10 - CONFIDENTIALITY

In the course of exercising this License Agreement each party will likely obtain
Confidential Information of the other party.  The parties agree to safeguard
against the unauthorized use and disclosure of any Confidential Information and
to use the same degree of care that each uses to protect its own information of
a similar nature, but in no event less than a reasonable degree of care under
the circumstances.  Neither party to this License Agreement will disclose the
other party's Confidential Information to any third person, except (i) with the
prior written consent of the other party; (ii) to the extent necessary to comply
with law or legal process, in which event the party making the disclosure will,
subject to applicable law, notify the other party as promptly as practicable
prior to making any disclosure and seek confidential treatment of the
information; (iii) to the extent necessary, as a part of its normal reporting or
review procedure to its parent company, or its auditors and attorneys on a
confidential basis; or (iv) in connection with the enforcement of the party's
rights hereunder or under any related agreements.  The parties hereto agree to
restrict disclosure of the Confidential Information solely to its employees or
others under its control who have a need to know the same in furtherance of the
purposes of this License Agreement and who have been directed and contractually
or legally restricted from disclosing the Confidential Information at least to
the degree required under this License Agreement.  Each party shall be liable to
the other for any breach of the covenants of confidentiality contained herein by
its agents or employees.  The provisions of this section shall survive the
expiration or termination of this License Agreement.

                               ARTICLE 11 - ASSIGNMENT

11.1   BY SBCL.  SBCL may assign all of its rights and obligations under this
       License Agreement or any license granted hereunder to any Affiliate, or
       to any corporation or other entity pursuant to a merger, consolidation,
       or other reorganization.  SBCL agrees to notify ActaMed of any such
       assignment, in writing, specifying the name and address of the other
       entity.  

                                       -16-
<PAGE>

11.2   BY ACTAMED.  ActaMed may assign all of its rights and obligations under
       this License Agreement or any license granted hereunder to any Affiliate
       or to any other corporation or other entity pursuant to a merger,
       consolidation, or other reorganization.  ActaMed agrees to notify SBCL
       at least thirty (30) days prior to the date of any such assignment, in
       writing, specifying the name and address of the assignee. 
       Notwithstanding the foregoing:

                 (i)  Nothing in this License Agreement shall be construed to
                      authorize ActaMed to assign this License Agreement to any
                      assignee if such assignee or any Affiliate of the
                      assignee is engaged in the business of performing
                      laboratory services similar to those performed by SBCL as
                      of the date of the assignment, and

                (ii)  SBCL shall have the right to require ActaMed to void the
                      assignment if the assignee or any Affiliate of the
                      assignee enters the business of performing laboratory
                      services similar to those performed by SBCL as of the
                      date of this Agreement or the date of the assignment.

11.3   OTHER.  Except as expressly set forth in this Article 11 and except as
       the other party may consent in writing, neither party may assign or
       transfer this License Agreement or any right or obligation hereunder to
       any third party, and any attempt to do so in contravention of this
       Article 11 shall be void and shall have no force or effect.  

                          ARTICLE 12 - DISPUTE RESOLUTION

12.1   INFORMAL DISPUTE RESOLUTION. Any dispute between the parties arising out
       of or with respect to this License Agreement, either with respect to the
       interpretation of any provision of this Agreement or with respect to the
       performance by ActaMed or SBCL, shall be resolved as provided in this
       Article.

       12.1.1  Prior to the initiation of formal dispute resolution procedures,
               the parties shall first attempt to resolve their dispute
               informally, as follows:

                 (i)  The Representatives (as defined in the Services
                      Agreement) for each party shall meet for the purpose of
                      endeavoring to resolve such dispute.  They shall meet as
                      often as the parties reasonably deem necessary in order
                      to gather and furnish to the other all information with
                      respect to the matter in issue which the parties believe
                      to be appropriate and germane in connection with its
                      resolution.  The Representatives shall discuss the
                      problem and negotiate in good faith in an effort to
                      resolve the dispute without the necessity of any formal
                      proceeding.  During the course of negotiations, all
                      reasonable requests made by one party to another for
                      nonprivileged information, reasonably 

                                       -17-

<PAGE>

                      related to this Agreement, shall be honored in order that 
                      each of the parties may be fully advised of the other's 
                      position.
                      
                (ii)  If, within fifteen (15) days after a matter has been
                      identified for resolution pursuant to this Article,
                      either of the Representatives concludes in good faith
                      that amicable resolution through continued negotiation in
                      this forum does not appear likely, the matter will be
                      escalated by formal written notification to the SBCL
                      President and the ActaMed President (both as defined in
                      the Services Agreement).  The parties will use their
                      respective best efforts to cause the SBCL President and
                      the ActaMed President to meet to attempt to resolve the
                      dispute.

               (iii)  Formal proceedings for the resolution of a dispute may
                      not be commenced until the earlier of:  (i) the date on
                      which the SBCL President and the ActaMed President
                      conclude in good faith that amicable resolution through
                      continued negotiation of the matter does not appear
                      likely; or (ii) thirty (30) days after the dispute has
                      been referred to the SBCL President and the ActaMed
                      President.

       12.1.2  The provisions of this Article 12 shall not be construed to
               prevent a party from instituting, and a party is authorized to
               institute, formal proceedings earlier to avoid the expiration of
               any applicable limitations period.

12.2   ARBITRATION.  If the parties are unable to resolve any controversy
       arising under this Agreement as contemplated by Section 12.1 and if such
       controversy is not subject to Section 12.3 or Section 12.4, then such
       controversy shall be submitted to mandatory and binding arbitration at
       the election of either Party (the Disputing Party) pursuant to the
       following conditions:

       12.2.1  The Disputing Party shall notify the AAA and the other Party in
               writing describing in reasonable detail the nature of the dispute
               (the "DISPUTE NOTICE").  The parties shall each select a neutral
               arbitrator in accordance with the rules of AAA and the two (2)
               arbitrators selected shall select a third neutral arbitrator. 
               The three (3) arbitrators so selected are herein referred to as
               the "PANEL."

       12.2.2  The Panel shall allow reasonable discovery as permitted by the
               Federal Rules of Civil Procedure, to the extent consistent with
               the purpose of the arbitration.  The Panel shall have no power or
               authority to amend or disregard any provision of this Article 12.
               The arbitration hearing shall be commenced promptly and conducted
               expeditiously, with each of ActaMed and SBCL being allocated 
               one-half of the time for the presentation of its case.  Unless
               otherwise agreed to by the parties, an arbitration hearing shall
               be conducted on consecutive days.

                                       -18-
<PAGE>

       12.2.3  Should any arbitrator refuse or be unable to proceed with
               arbitration proceedings as called for by this Section, such
               arbitrator shall be replaced by an arbitrator selected in
               accordance with the rules of the AAA and consistent with this
               Article 12.

       12.2.4  The Panel rendering judgment upon disputes between parties as
               provided in this Article 12 shall, after reaching judgment and
               award, prepare and distribute to the parties a writing describing
               the findings of fact and conclusions of law relevant to such
               judgment and award and containing an opinion setting forth the
               reasons for the giving or denial of any award.  The award of the
               arbitrator shall be final and binding on the parties, and
               judgment thereon may be entered in a court of competent
               jurisdiction.

       12.2.5  Arbitration hearings hereunder shall be held in Washington D.C.
               or another mutually agreeable location.

       12.2.6  The Panel shall be instructed that time is of the essence in the
               arbitration proceeding.  The Panel shall render its judgment or
               award within fifteen (15) days following the conclusion of the
               hearing.  Recognizing the express desire of the parties for an
               expeditious means of dispute resolution, the arbitrator shall
               limit or allow the parties to expand the scope of discovery as
               may be reasonable under the circumstances.

12.3   IMMEDIATE INJUNCTIVE RELIEF.  The nonbreaching party may file a pleading
       with a court seeking immediate injunctive relief in the event the other
       party commits a breach of the confidentiality obligations set forth in
       this Agreement, SBCL violates the limitations imposed by Section 3.2
       hereof, ActaMed violates the limitations imposed by Section 2.2 or 2.3
       hereof, or in the event a party makes a good faith determination that a
       breach of the terms of this Agreement by the other party is such that
       the damages to such party resulting from the breach will be so
       immediate, so large or severe, and so incapable of adequate redress
       after the fact that a temporary restraining order or other immediate
       injunctive relief is a necessary remedy.  If a party files a pleading
       with a court seeking immediate injunctive relief and this pleading is
       challenged by the other party and the injunctive relief sought is not
       awarded in substantial part (or in the event of a temporary restraining
       order is vacated upon challenge by the other party), the party filing
       the pleading seeking immediate injunctive relief shall pay all of the
       costs and attorneys fees of the party successfully challenging the
       pleading.

12.4   JURISDICTION.  ActaMed and SBCL each consent to venue in Philadelphia,
       Pennsylvania and to the nonexclusive jurisdiction of competent
       Pennsylvania state courts or federal courts located in Philadelphia for
       all litigation which may be brought, subject to the requirement for
       arbitration hereunder, with respect to the terms of, and the
       transactions and relationships contemplated by, this Agreement. 

12.5   CONTINUED PERFORMANCE; CONTINUATION OF LICENSES.  Each party agrees to
       continue performing its obligations under this Agreement while any
       dispute is being resolved unless 

                                       -19-
<PAGE>

       and until such obligations are terminated or expire in accordance with 
       the provisions by the termination or expiration of this Agreement not 
       in dispute.  Nothing in this Agreement shall be construed as altering 
       the perpetual and irrevocable nature of the licenses granted by this 
       Agreement or as authorizing any arbitrator or court in any way to 
       enjoin or otherwise interfere with the proper exercise of such 
       licenses by either party hereto.

                              ARTICLE 13 - MISCELLANEOUS

13.1   FURTHER ASSURANCES.  From time to time SBCL and ActaMed and their
       respective officers, employees, contractors, representatives and agents,
       shall confirm the provisions of this Agreement by execution and delivery
       of such assignments, confirmations or other written instruments as may
       be reasonably requested by the other party in order to vest each party
       with the rights mentioned in this Agreement.  ActaMed and SBCL shall
       obtain appropriate assignments, covenants and obligations from its
       officers, employees, representatives, agents and any contractors hired
       to carry out its obligations under the SCAN Agreements prior to their
       performance thereof to ensure SBCL or ActaMed, as the case may be, may
       own the rights specified in this Agreement.

13.2   INTEGRATION.  This License Agreement (including all of the Schedules
       hereto) supersedes all prior agreements and understandings between the
       parties with respect to the subject matter of this License Agreement,
       and is intended by the parties as the complete and exclusive statement
       of their agreement, and supersedes all prior understandings and
       agreements, whether oral or written, between the parties with respect to
       the same subject matter.

13.3   FORCE MAJEURE.  Each party shall be excused from delays in performing or
       from its failure to perform hereunder to the extent that such delays or
       failures result from causes beyond the reasonable control of such party;
       PROVIDED that, in order to be excused from delay or failure to perform,
       such party must act diligently to remedy the cause of such delay or
       failure.

13.4   NO AGENCY.  Each party hereto, is acting solely as an independent
       contractor.  In no way is either party to be construed as the agent or
       to be acting as the agent of the other party in any respect.  Each party
       has the sole obligation to supervise, manage, contract, direct, procure,
       perform, or cause to be performed all work to be carried out by such
       party under any SCAN Agreement.

13.5   NO WAIVER.  No delay or omission by either party to exercise any right 
       arising upon any noncompliance with, or breach of, any covenant, 
       condition or agreement to be performed by the other party shall impair 
       any such right or be construed to be a waiver thereof.  A waiver by 
       either of the parties hereto of any noncompliance with, or breach of, 
       any covenant, condition or agreement to be performed by the other 
       party must be in writing and signed by both parties. No waiver of any 
       right upon any one occurrence of noncompliance or breach

                                -20-

<PAGE>

       shall be construed to be a waiver of any succeeding noncompliance or 
       breach.  Unless stated otherwise, all remedies provided for in this 
       License Agreement shall be cumulative and in addition to and not in 
       lieu of any other remedies available to either party at law, in 
       equity, or otherwise.

13.6   SEVERABILITY.  If any term, covenant, condition or provision of this
       License Agreement or the application thereof to any circumstance shall
       be invalid or unenforceable to any extent, the remaining terms,
       covenants, conditions and provisions of this License Agreement shall not
       be affected thereby and each remaining term, covenant, condition and
       provision of this License Agreement shall be valid and enforceable to
       the fullest extent permitted by law.  If any provision of this License
       Agreement is so broad as to be unenforceable, such provision shall be
       interpreted to be only as broad as is enforceable.

13.7   NOTICES.  If one party is required or desires to give notice to the
       other, such notice shall be deemed given if mailed by U.S. mail, first
       class, postage prepaid, or via a nationally recognized overnight
       carrier, with all freight charges prepaid, and addressed as follows (or
       as subsequently noticed to the other party):

       If to SBCL:            SmithKline Beecham Clinical Laboratories, Inc.
                              1201 S. Collegeville Road 
                              Collegeville, PA 19426 
                              ATTN: [*]

       If to ActaMed:         ActaMed Corporation 
                              7000 Central Parkway Suite 600
                              Atlanta, GA 30328 
                              ATTN: MIKE HOOVER

13.8   GOVERNING LAW; INTERPRETATION.  This License Agreement shall be
       construed, interpreted and enforced under the laws of the Commonwealth
       of Pennsylvania, excluding its provisions regarding conflicts of law. 
       The section and subsection headings used herein are for reference and
       convenience only, and shall not enter into the interpretation hereof.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                       -21-
<PAGE>


       IN WITNESS WHEREOF, the parties have caused this License Agreement to be
executed on the date set forth below.


SMITHKLINE BEECHAM CLINICAL          ACTAMED CORPORATION

LABORATORIES, INC.                                  

BY:  /s/ John B. Okkerse, Jr.          BY:  /s/ Michael K. Hoover
   ---------------------------            -------------------------
NAME:  John B. Okkerse, Jr.            NAME:  Michael K. Hoover
   ---------------------------            -------------------------
TITLE:  President                      TITLE:  President
   ---------------------------            -------------------------
DATE:  12-31-97                        DATE:  12-31-97
   ---------------------------            -------------------------










<PAGE>

                                     SCHEDULE A

                                   SBCL SOFTWARE

- -      SBCL proprietary Software known as [*] (including without limitation
       the [*]) and [*].

- -      Download programs and routines and other SBCL proprietary Software
       reasonably required to perform Information Services as SBCL is
       performing them as of the date of the License Agreement.

- -      Documentation owned by SBCL and related to any of the foregoing.

- -      Specifications owned and possessed by SBCL with respect to the
       foregoing.

- -      Such Specifications for the Software known as [*] and [*] as SBCL
       determines reasonably necessary for the SBCL Software, SCAN Developments
       and ActaLab Software [*] and [*].

- -      Such updates, upgrades, corrections, modifications, and enhancements to
       any of the foregoing created during the term of the Services Agreement.

- -      All patents, patent applications, copyrights, trade secrets, know-how,
       information and other intellectual property rights that are currently
       owned or controlled by SBCL and that are embodied or practiced in the
       foregoing.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

<PAGE>

 
                                 SCHEDULE B

                     AMENDMENTS TO DEVELOPMENT AGREEMENT
                                          
SBCL and ActaMed hereby agree this    day of December, 1997, to amend their
Development Agreement October 31, 1997, as set forth herein as of the effective
dates set forth herein.

       1.      Effective as of the date of the Development Agreement, Article I
of the Development Agreement is hereby amended to include the following
additional or revised definitions:

               "ActaLab Software" has the meaning ascribed to it by the License
       Agreement.

               "Deliverable" means all Software, Documentation and other
       materials developed by ActaMed under this Agreement and described in a
       Statement of Work.

               "License Agreement" means that certain License Agreement between
       SBCL and ActaMed dated December 22, 1997.

               "SBCL Software" has the meaning ascribed to it by the License
       Agreement.

               "SOW No. 1" shall mean the Statement of Work dated October 31,
       1997.

       2.      The second "Whereas" clause is hereby deleted.

       3.      The fourth "Whereas" clause is hereby revised to delete the words
"to SBCL."

       4.      Section 5.1(a) of the Development Agreement is hereby revised as
of the date of the Development Agreement to read as follows:

                      (a)     The parties hereby acknowledge and agree that:

                              (i)    The Deliverables under SOW No. 1 do not 
       [*] the SBCL Software, but instead [*] which will be used in conjunction
       with and/or will be integrated into ActaMed's ProviderLink software.  
       All Deliverables (including but not limited to, the ActaLab Software) 
       under SOW No. 1, and all intellectual property rights (including but not
       limited to copyrights and all renewals and extensions thereof) in such 
       Deliverables, shall be [*].  Subject to the provisions of Section 
       5(a)(iv) hereof, SBCL hereby grants, transfers and assigns all of its 
       right, title and interest in such Deliverables, including patents, 
       copyrights, trade secrets and other intellectual property developed or 
       acquired in the course of creating such Deliverables, to ActaMed and 
       ActaMed shall have the right to obtain and hold in its own name 
       copyrights, 


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

<PAGE>

       patents, registrations and similar protections which may be available
       with respect to such Deliverables.
       
                              (ii)   The parties contemplate that additional
       SOWs may be entered into from time to time for the purpose of enhancing,
       modifying or upgrading the ActaLab Software (an "ActaLab SOW").  All
       Deliverables under an ActaLab SOW and all intellectual property rights
       (including but not limited to copyrights and all renewals and extensions
       thereof) in such Deliverables, shall be [*].  Subject to the provisions
       of Section 5(a)(iv) hereof, SBCL hereby grants, transfers and assigns all
       of its right, title and interest in such Deliverables, including patents,
       copyrights, trade secrets and other intellectual property developed or 
       acquired in the course of creating such Deliverables, to ActaMed and 
       ActaMed shall have the right to obtain and hold in its own name 
       copyrights, patents, registrations and similar protections which may be
       available with respect to such Deliverables.

                              (iii)  The parties contemplate that additional
       SOWs may be entered into from time to time for the purpose of enhancing,
       modifying or upgrading the SBCL Software (a "SCAN Development SOW"). 
       Ownership of any Deliverables under a SCAN Development SOW, and
       ownership of any intellectual property rights therein (including but not
       limited to copyrights and all renewals and extensions thereof), shall be
       governed in all respects by Article 3 of the License Agreement.  Subject
       to the provisions of Section 5(a)(iv) hereof, ActaMed hereby grants,
       transfers and assigns all of its right, title and interest in such
       Deliverables, including patents, copyrights, trade secrets and other
       intellectual property developed or acquired in the course of creating
       such Deliverables, to SBCL.

                              (iv)   Nothing in this Section 5(a) shall be
       construed to transfer to ActaMed, or otherwise divest SBCL of SBCL's
       ownership of, the SBCL Software and, subject to the licenses granted by
       the License Agreement, SBCL (as between SBCL and ActaMed) shall be the
       sole owner of the patents, copyrights, trade secrets and other
       intellectual property rights therein.  Nothing in this Section 5(a)
       shall be construed to transfer to SBCL, or otherwise divest ActaMed of
       ActaMed's ownership of, any software or work of authorship owned by
       ActaMed as of the effective date of the Development Agreement and,
       subject to the licenses granted by the License Agreement, ActaMed (as
       between SBCL and ActaMed) shall be the sole owner of  any patent,
       copyright, trade secret right or other intellectual property right
       therein.  

                              (v)    Any Statement of Work, by mutual agreement
of the parties, may include limitations and restrictions on ActaMed's use of the
applicable Deliverables in support of laboratory testing services of commercial
laboratories other than SBCL.

       6.      Sections 5.1(d) and (e) and Section 5.2(a) as of the date of this
Amendment are hereby deleted from the Development Agreement.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

<PAGE>

       7.      In the event of conflict between the Development Agreement and
the License Agreement, the License Agreement shall control.

       9.      Except as expressly set forth herein, the Development Agreement
shall continue in full force and effect as originally executed by the parties.

       10.     Nothing in this Agreement shall be construed to modify or change
in any respect the ownership and use rights with respect to Exclusive
Developments (as defined in the Services Agreement between SBCL and ActaMed
dated the date hereof) pursuant to the License Agreement and Section V of said
Services Agreement.

               In witness whereof, the parties have caused this Amendment to be
signed this        day of December, 1997.


SMITHKLINE BEECHAM CLINICAL          ACTAMED CORPORATION

LABORATORIES, INC.

BY:   /s/                            BY: /s/                          
   ----------------------------         ---------------------------

NAME: John B. Okkersee Jr.           NAME: Michael K. Hoover
     --------------------------           -------------------------


TITLE: President                     TITLE: President
      -------------------------            ------------------------


DATE:                                DATE:                               
     --------------------------           -------------------------


<PAGE>
             CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED 
        AND FILED SEPARATELY WITH THE COMMISSION.  CONFIDENTIAL TREATMENT 
             HAS BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.


                                DEVELOPMENT AGREEMENT


     THIS AGREEMENT is made as of this 31 day of October, 1997, by
and between SmithKline Beecham Clinical Laboratories, Inc., a Delaware
corporation with offices located at 1201 S. Collegeville Road, Collegeville, PA
19426 ("SBCL"), and ActaMed Corporation, a Georgia corporation with offices
located at 7000 Central Parkway, Suite 600, Atlanta, GA  30328 ("ACTAMED").

     WHEREAS, ACTAMED has expertise in software development, installation and
implementation, systems analysis and design, data processing and computer
programming;

     WHEREAS, ACTAMED employs a staff of qualified technical personnel whose
services ACTAMED is willing to provide to SBCL on a temporary or project basis;

     WHEREAS, SBCL desires to have ACTAMED provide certain services and
personnel to SBCL for the project described in the attached Statement of Work;
and

     WHEREAS, the parties desire to agree upon the terms and conditions under
which ACTAMED may provide such services and personnel to SBCL.

     NOW, THEREFORE, in consideration of the foregoing premises and the mutual
covenants and agreements contained herein, the parties hereto agree as follows:

                                      ARTICLE I
                                     DEFINITIONS

     For purposes of this Agreement, the following terms shall have the
following meanings and shall include the plural as well as the singular:

     "Affiliate" means any corporation or other entity which controls, is
controlled by, or is under common control with SBCL, and any joint venture or
partnership in which SBCL is a partner or joint venturer, or any other entity in
which SBCL has an interest and to which it supplies or receives information
processing services.  A corporation or other entity shall be deemed to control
another corporation or entity if it owns, directly or indirectly, more than
fifty percent (50%) of the voting shares or other interest, or has the power to
elect more than half the directors, of such other corporation or entity.

     "Confidential Information" means any and all proprietary information
disclosed or made available by a party hereto to the other party in the course
of performing hereunder, whether in written, oral, magnetic, photographic,
optical or other form and whether now existing or hereafter created, including,
without limitation, all trade secrets, know-how, information systems,
technology, data, computer programs, processes, methods, operational procedures,
plans, strategies or results, and other information of a similar nature that is
not generally disclosed by such party to the public.

<PAGE>

Confidential Information shall not include any information which (a) is proven
by written evidence to have been in a receiving party's possession prior to
disclosure by the other party; (b) is received from a third party having the
right to disclose such information; (c) is or hereafter becomes public knowledge
through no act or fault of a receiving party; or (d) is proven by written
evidence to have been independently developed by a receiving party without
access to the Confidential Information of the other party.

     "Deliverables" means all Software, Documentation and other materials
developed for or delivered to SBCL by ACTAMED under this Agreement and described
in a Statement of Work.

     "Derivative Work" means a work that is based upon one or more preexisting
works, such as a revision, modification, translation, abridgment, condensation,
expansion, or any other form in which such preexisting works may be recast,
transformed, translated or adapted, and that, if prepared without authorization
of the owner of the copyright in such preexisting work, would constitute a
copyright infringement.

     "Documentation" means manuals (e.g., user, utility reference and language
reference) and other written materials that relate to particular Software,
including materials useful for the operation of the Software by a user, and
information (e.g., data flows, data structures, control logic, flow diagrams,
and principles of operation) useful for design, modification and maintenance of
the source code by a programmer.  Documentation also shall include any
Maintenance Modifications or Enhancements thereto created by ACTAMED from time
to time, and such additional materials as may be described in a Statement of
Work.

     "Enhancements" means changes or additions, other than Maintenance
Modifications, to Software and related Documentation, including all new
releases, that improve functions, add new functions, or significantly improve
performance by changes in system design or coding.

     "Error" means any error, problem, or defect resulting from (a) an incorrect
functioning of Software, or (b) an incorrect or incomplete statement of diagram
in Documentation, if such an error, problem or defect renders the Software
inoperable, causes the Software to fail to meet the Specifications thereof,
causes the Documentation to be inaccurate or incomplete in any material respect,
causes incorrect results or causes incorrect functions to occur when any such
materials are used.

     "Maintenance Modifications" means any modifications or revisions, other
than Enhancements, to Software or Documentation that correct Errors, support new
releases of the operating systems with which the Software is designed to
operate, support new input/output devices or provide other incidental updates
and corrections.

     "Services" means the software development, design, analysis, data
processing, computer programming, consulting, training and/or such other
services and duties to be provided to SBCL under this Agreement and described in
a Statement of Work.


                                         -2-
<PAGE>

     "Software" means computer programming code, including updates and revisions
thereto, which conform to the Specifications and includes both object code
(i.e., machine-readable) and source code (i.e., human-readable), and associated
procedural code, all as more fully described in a Statement of Work.  Software
also shall include any Maintenance Modifications and Enhancements thereto
created by ACTAMED from time to time.

     "Specifications" means the description of the design, operating procedures,
performance, functions and other requirements for the Software set forth in a
Statement of Work.

     "Statement of Work" or "SOW" means a written instrument in substantially
the form of Exhibit A attached hereto which is signed on behalf of both parties
by their authorized representatives.

                                      ARTICLE II
                                       SERVICES

     2.1   SERVICES.  SBCL hereby retains ACTAMED to provide the Services and
Deliverables, and ACTAMED hereby agrees to provide the Services and
Deliverables, in the manner described in this Agreement and in Statements of
Work issued from time to time hereunder.  The Services and Deliverables shall
conform to the Specifications set forth in the applicable SOW.

     2.2   SCHEDULE; LOCATION.  SBCL, at its own expense, shall furnish to
ACTAMED access to appropriate computer personnel, as well as all relevant
Documentation, Specifications and source code in its possession and necessary
for ACTAMED to provide the Services and Deliverables.  ACTAMED will provide the
Services and deliver the Deliverables on or before the dates (the "Schedule")
and at the location(s) set forth in a SOW.  Delivery of any intermediate
Deliverables, or status reports thereon, also shall be on the dates specified in
the Schedule.  No variation or modification shall be made to the Schedule
without the prior written consent of SBCL and ACTAMED.

     2.3   Personnel.

           (a)   ACTAMED shall provide fully trained, competent and skilled
personnel for performance of the Services.

           (b)   Promptly upon execution of this Agreement, each party shall
notify the other party of the name, business address and telephone number of its
Contract Administrator.  The Contract Administrators of each party shall be
responsible for arranging all meetings, visits and consultations between the
parties that are of a nontechnical nature.  The Contract Administrator also
shall be responsible for receiving all notices under this Agreement and for all
administrative matters such as invoices, payments and amendments.

           (c)   Each SOW shall state the name, business address and telephone
number of the Project Managers for each party.  The Project Managers of each
party designated for a particular


                                         -3-
<PAGE>

SOW shall, with respect to such SOW, be responsible for technical and
performance matters, and the delivery, receipt and acceptance of the
Deliverables and technical information.

     2.4   PROGRESS REPORTS AND MEETINGS.  At either party's reasonable written
request from time to time during the performance of this Agreement, but at least
once each month, and at no additional cost, the Project Managers and any other
personnel either party may designate shall meet to review the progress of the
project described in a particular SOW.  At each such meeting, ACTAMED shall
provide SBCL with a written status report, which shall include but not be
limited to, any problem that, in ACTAMED's reasonable judgment, might cause any
increase in the budgeted costs for such project or adversely affect ACTAMED's
ability to meet the Schedule or the Specifications.

     2.5   Change Order Procedures.

           (a)   REQUIREMENT OF CHANGE ORDERS.  All changes, modifications and
additions to the obligations of either party under this Agreement or any SOW
requires a written change order (a "Change Order").  Either party may initiate a
Change Order by submitting a written request for a Change Order to the other
party along with an explanation of reasons as to why such a modification is
desirable or necessary.

           (b)   CHANGE ORDER CONTENTS.  All Change Orders must contain:

                 (i)     a description of any additional work to be performed
and/or changes to the performance required of either party, including the
estimated number and skill level of personnel necessary to make such changes
and/or additions and the availability of such personnel over the ensuing period;

                 (ii)    a statement of the impact of the work or changes on the
Services, Deliverables, Schedule, costs or other requirements of this Agreement
or a SOW;

                 (iii)   acceptance test procedures for such work, if
applicable; and

                 (iv)    signatures of duly authorized individuals of each
party.

           (c)   ACCEPTANCE OF CHANGE ORDER.  Within ten (10) days of the
submission of a Change Order request from one party to the other, the receiving
party shall notify the other party of its acceptance or rejection.  SBCL may, in
its sole discretion, reject any Change Order requested by ACTAMED.  ACTAMED may
not decline to accept any Change Order requested by SBCL that, together with any
prior accepted Change Orders, do not substantially affect the nature of the
Deliverables, their performance or functionality, and does not change the
Schedule by more than two man day or dollar amounts by more than 2%.

     2.6   CONTROLLING DOCUMENT.  In the event any provision contained in this
Agreement conflicts with any part of a SOW, the provision set forth in the SOW
shall take precedence.


                                         -4-
<PAGE>

                                     ARTICLE III
                          COMPENSATION; PAYMENT AND EXPENSES

     3.1   COMPENSATION.  Amounts and method of payment for all Services and
Deliverables to be provided under this Agreement shall be set forth in each SOW.

     3.2   PAYMENT.  Unless otherwise specified in the applicable SOW, (a)
ACTAMED shall submit invoices to SBCL for payment for Services and Deliverables
within thirty (30) calendar days after the close of each month during which
Services were rendered and/or Deliverables were delivered to SBCL; and (b) all
undisputed invoices shall be due and payable within [*] days of SBCL's
receipt of such invoice and acceptance of the Services and/or Deliverables.  All
invoices shall specifically refer to the applicable SOW, indicate the period of
performance and provide reasonable detail with respect to the Services and
Deliverables to which they relate, including, if applicable, time and labor
spent in providing the Services, cost of materials and travel and living
expenses.  Supporting documentation called for by SBCL's standard reimbursement
policies shall accompany any such invoice.  Payment in accordance with these
terms shall represent full and complete compensation for all Services and
Deliverables provided pursuant hereto, and for any inventions, improvements,
copyrights, patent rights and other intellectual property rights assigned, as
more fully set forth below.

     3.3   RECORDS AND AUDITS.  ACTAMED shall maintain complete and accurate 
accounting records in accordance with sound accounting practices to 
substantiate ACTAMED's charges and shall preserve such records for a period 
of at least [*] after completion of the pertinent work.  SBCL shall have 
access to such records for purposes of audit, either through its own 
representatives or through an accounting firm selected and paid by SBCL.  Any 
such review of ACTAMED's records shall be conducted at reasonable times 
during business hours, and no more than twice annually.

     3.4   TAXES.  ACTAMED assumes all responsibility and liability for the
payment of any federal, state, or local income taxes due on money received from
SBCL hereunder, and shall be responsible for all employment taxes and
withholding with respect to its employees and contractors.

     3.5   EXPENSES.  Except as otherwise agreed by SBCL in writing, ACTAMED
shall bear all of its own expenses arising from performance of its obligations
under this Agreement and each SOW, including, without limitation, expenses for
transportation, living facilities, work spaces, utilities, management, clerical
and reproduction services, supplies, and the like.

                                      ARTICLE IV
                         DELIVERY; ACCEPTANCE AND MAINTENANCE

     4.1   DELIVERY.  ACTAMED shall deliver all Deliverables for testing and
acceptance in the manner set forth in the applicable SOW.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -5-
<PAGE>

     4.2   TESTING.

           (a)   Upon receipt of the Deliverables, SBCL shall test the
Deliverables to determine whether they meet the Specifications and any other
requirements set forth in the SOW.

           (b)   Unless otherwise specified in the applicable SOW, such testing
shall be conducted in accordance with the following testing procedures and
criteria:

                 (i)     SBCL will notify ACTAMED, in writing, that it is
accepting or rejecting the Deliverables within thirty (30) days after receipt.
Any notice of rejection shall set forth the grounds for rejection.  ACTAMED
shall use its best efforts to remedy any failures of the Deliverables to meet
the Specifications, and shall deliver corrected Deliverables to SBCL as soon as
possible.

                 (ii)    Upon receipt of corrected Deliverables, SBCL shall 
have [*] within which to test them and inform ACTAMED of its acceptance or 
rejection.

     This procedure may be repeated any number of times; PROVIDED, HOWEVER, that
if SBCL detects errors in the Deliverables or the Deliverables fail to meet the
Specifications, SBCL may withhold payment under the applicable SOW until the
errors in the Deliverables are corrected or the Deliverables meet the
Specifications.

           (c)   If SBCL detects errors in the Deliverables or the Deliverables
fail to meet the Specifications after it has tested them twice, SBCL shall
thereafter have, until it accepts the Deliverables, the right to terminate this
Agreement or the applicable SOW upon written notice to ACTAMED.  Upon such
termination, ACTAMED shall retain all payments SBCL has made to it up to the
date of termination, SBCL shall retain all Deliverables received by such date,
and SBCL shall have no further obligations to pay any amounts to ACTAMED under
this Agreement.

     4.3   ACCEPTANCE.  If SBCL does not detect any Errors or any failure of
the Deliverables to meet the Specifications after a performance of the tests
described in Section 4.2, SBCL shall accept the Deliverables by issuing a
written confirmation of acceptance to ACTAMED, which shall be effective as of
the date of successful completion of the tests.

                                      ARTICLE V
                            OWNERSHIP AND CONFIDENTIALITY

     5.1   OWNERSHIP OF WORK PRODUCT BY SBCL.

           (a)   SBCL and ACTAMED agree that any Deliverables prepared under 
this Agreement, including modifications to software owned by ACTAMED, and 
ownership of all intellectual property rights, including but not limited to 
copyrights and all renewals and extensions thereof, in such works shall [*].  
SBCL and ACTAMED agree to and hereby grant, transfer and assign such right, 
title and interest in the Deliverables, including patents, copyrights and 
trade secrets for purposes of, and to the extent necessary and


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -6-
<PAGE>

consistent with this Section 5.1(a).  From time to time SBCL and ACTAMED, and
their respective officers, employees, contractors, representatives and agents,
shall confirm the foregoing assignment by execution and delivery of such
assignments, confirmations or other written instruments as may be reasonably
requested by the other party in order to vest each party with the rights
mentioned in this Section 5.1(a).  ACTAMED shall obtain appropriate assignments,
covenants and obligations from its officers, employees, representatives, agents
and any contractors hired to carry out its obligations under this Agreement
prior to their performance under any SOW to ensure SBCL and ACTAMED may own the
rights specified in this Section 5.1(a).

           (b)   ACTAMED agrees that it shall not, directly or indirectly,
produce, develop or participate in the production or development of any work,
materials documentation or software similar to any Deliverable or Specification,
or utilize any techniques, methods or know-how relating to the aforementioned
items, for the period beginning as of the date hereof and ending on the date on
which the last phase any Deliverable was scheduled under an SOW to be delivered
to SBCL for testing and acceptance, or the date the last phase any such
Deliverable was actually delivered to SBCL for testing and acceptance, whichever
is later; PROVIDED, HOWEVER, nothing contained in this Section 5.1(b) shall
prohibit ACTAMED from purchasing any work, documentation or software similar in
function or purpose to any of the Deliverables or Specifications that is
produced or developed independently by a third party without access, reference
or knowledge of the Deliverables, Specifications or any other SBCL Confidential
Information.  SBCL reserves the right to audit and inspect any work, materials,
documentation or software developed or purchased by ACTAMED at any time that is
similar to any Deliverable or Specification for purposes of ensuring compliance
with the confidentiality provisions of this Agreement.

           (c)   ACTAMED agrees that if, during [*] beginning with the date on 
which the last phase of any Deliverable was scheduled under SOW No. 1 to be 
delivered to SBCL for testing and acceptance, or the date the last phase of 
any such Deliverable was actually delivered to SBCL for testing and 
acceptance, whichever is later, ACTAMED, directly or indirectly, produces, 
develops or participates in the production or development of any laboratory 
test ordering and result reporting software, ACTAMED will not permit any 
software engineer, designer or similar person (whether an employee or 
independent contractor) that participated in the production or development of 
the Services or Deliverables or who otherwise had access to SBCL Confidential 
Information to participate, directly or indirectly, in such production or 
development.

           (d)   Notwithstanding anything to the contrary in this Agreement,
both SBCL and ACTAMED agree not to exercise or to authorize any other party to
exercise any of SBCL's or ACTAMED's ownership rights or privileges with respect
to any of the Deliverables, including without limitation, the right to use,
license, sell, deliver, transfer or incorporate such Deliverables into any other
product for any reason without the prior written consent of the other party.
Neither party shall have any obligation to give their consent for purposes of
this Section 5.1(d).

           (e)   SBCL and ACTAMED agree not to reveal any Deliverable, in whole
or in part, to anyone outside of ACTAMED or SBCL without the prior written
consent of the other party, or to any officer, employee, contractor,
representative or agent of ACTAMED or SBCL who is not


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -7-
<PAGE>

covered by the restrictions on confidentiality and use contained herein.
ACTAMED further agrees not to use, sell, deliver, transfer or reveal any
Specification, in whole or in part, to anyone outside of ACTAMED without SBCL's
prior written consent, or to any officer, employee, contractor, representative
or agent of ACTAMED who is not covered by the restrictions on confidentiality
and use contained herein.

     5.2   PREEXISTING WORKS.

           (a)   In the event that any Deliverable or part thereof constitutes
a Derivative Work of any preexisting works owned by either party, or in the
event either party requires the other party's preexisting works in order to
perform under this Agreement, each party hereby grants to the other party and
its Affiliates a non-exclusive, worldwide, royalty-free right and license to
use, execute, reproduce, display, perform and distribute internally such
preexisting works for the sole and limited purpose of developing the
Deliverables and performing the Services in accordance with this Agreement.  All
rights not granted herein are specifically reserved.  For purposes of this
Section 5.2, "preexisting works" shall include, but not be limited to, the
Specifications (including the specifications for the [*] and [*] 
systems) and "SBCL SCAN" software, in the case of SBCL, and the "Provider Link"
software, in the case of ACTAMED.

           (b)   In the event that any Deliverable or part thereof constitutes
a Derivative Work of preexisting works not owned by SBCL or ACTAMED, SBCL or
ACTAMED, as the case may be, shall ensure that the other party and its
Affiliates have a non-exclusive, worldwide, royalty-free right and license to
use, execute, reproduce, display, perform and distribute internally such
preexisting works for the sole and limited purpose of developing the
Deliverables and performing the Services in accordance with this Agreement.
SBCL and ACTAMED each agree to notify the other party in writing of any
pre-existing work, or portion thereof, which either or them does not own prior
to the incorporation of such pre-existing work in the Deliverables.  Such notice
shall identify: (i) the pre-existing work which is not owned, (ii) the owner of
such pre-existing work, (iii) SBCL's or ACTAMED's, as the case may be, right to
use such pre-existing work, (iv) the nature of SBCL's or ACTAMED's right to
grant to the other party the license contemplated herein, and (v) it shall grant
the other party the aforesaid rights and license.

     5.3   OBLIGATION OF CONFIDENTIALITY.

           (a)   SBCL and ACTAMED each acknowledge and agree that during the
term of this Agreement, they shall have access to certain Confidential
Information of the other party.  SBCL and ACTAMED each agree to keep such
Confidential Information in strict confidence and shall not disclose it to any
person, firm, partnership or corporation other than to its officers, employees,
contractors, representatives and agents who have a need to know such information
in order to perform hereunder or under a SOW, nor use the same for any purpose
other than performance hereunder or under a SOW.  SBCL and ACTAMED,
respectively, shall advise all officers, employees, contractors, representatives
and agents with access to the other party's Confidential Information of the
confidentiality obligations with respect thereto under this Agreement.
Notwithstanding the foregoing, SBCL and ACTAMED shall be and remain liable and
responsible


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -8-
<PAGE>

for the confidentiality obligations of their respective officers, employees,
contractors, representatives and agents.  In addition to the foregoing, SBCL and
ACTAMED shall protect and safeguard the other party's Confidential Information
by using the same degree of care, but no less than a reasonable degree of care
to prevent the unauthorized use, dissemination or publication of such
Confidential Information as they each use to protect their own confidential or
proprietary information of a like nature.  Upon request by the other party, SBCL
and ACTAMED shall require any or all of its officers, employees, contractors,
representatives and agents to sign a confidentiality agreement prepared by the
other party and approved by SBCL or ACTAMED, as the case may be, which affirms
such officers, employees, contractors, representatives or agents obligations in
regards to the Confidential Information.

           (b)   SBCL and ACTAMED each acknowledge and agree that the terms and
conditions with respect to confidentiality are reasonable and necessary for the
protection of each of the party's Confidential Information and to prevent damage
or loss to the other party.  SBCL and ACTAMED further agree that any breach or
threatened breach of such provisions will cause the other party irreparable harm
for which there is no adequate remedy at law.  Therefore, SBCL and ACTAMED each
agree that the nondisclosing party shall be entitled, in addition to any other
remedies available, to injunctive or other equitable relief to require specific
performance or to prevent a breach of the foregoing confidentiality provisions.

           (c)   Upon the breach of any provision, early termination or
completion of this Agreement or any SOW, SBCL and ACTAMED each agree to cease
all use and make no further use of the Confidential Information disclosed to it
by the other party and shall, upon the written request of the other party,
promptly return all such Confidential Information, including any copies used or
distributed to any of its officers, employees, contractors, representatives and
agents, and retain no copies.

           (d)   The confidentiality obligations of this Section 5.3 shall
survive termination of this Agreement.

                                      ARTICLE VI
                            REPRESENTATIONS AND WARRANTIES

     6.1   WARRANTY OF TITLE AND NONINFRINGEMENT.

           (a)   ACTAMED represents and warrants to SBCL that:

                 (i)     unless ACTAMED provides SBCL with advance written
notice to the contrary in accordance with Section 5.2(b), ACTAMED is and will be
the sole author of all works used by ACTAMED in preparing any and all
Deliverables;

                 (ii)    ACTAMED shall require all officers, employees,
contractors, representatives and agents who provide Services or Deliverables
hereunder to assign to ACTAMED all intellectual property rights created or
arising in the performance of the Services and Deliverables for purposes
consistent with Article V;


                                         -9-
<PAGE>

                 (iii)   ACTAMED has and will have full and sufficient right to
assign or grant the rights granted pursuant to this Agreement, free and clear of
any liens, claims or encumbrances; and

                 (iv)    none of the Deliverables infringe any patents,
copyrights, trademarks, or other intellectual property rights (including trade
secrets), privacy or similar rights of any third party, nor has any claim of
such infringement been threatened or asserted.

           (b)   SBCL represents and warrants to ACTAMED that:

                 (i)     SBCL has and will have full and sufficient right to
assign or grant the rights granted pursuant to this Agreement, free and clear of
any liens, claims or encumbrances; and

                 (ii)    none of the Specifications, software and any other
materials provided to ActaMed by SBCL hereunder infringe any patents,
copyrights, trademarks, or other intellectual property rights (including trade
secrets), privacy or similar rights of any third party, nor has any claim of
such infringement been threatened or asserted.

     6.2   WARRANTIES OF CONFORMITY, PERFORMANCE AND COMPLIANCE.  ACTAMED
represents and warrants to SBCL that:

           (a)   all Services and Deliverables shall be performed or provided
in a workmanlike manner and with professional diligence and skill;

           (b)   no portion of the Software contains any unauthorized code such
as a virus, Trojan horse, worm or other software routine or hardware component
designed to permit unauthorized access to disable, erase or otherwise harm the
Software, hardware, or data automatically, with the passage of time or under the
control of a person other than SBCL; and

           (c)   the Software includes acceptable Specifications so that any or
all such Software and any related hardware will not abruptly end or provide
invalid or incorrect results during the operation of SBCL's business due to
issues related to Year 2000 compliance.  "Year 2000 compliance" requires that
the Specifications of the Software and related hardware include, but not be
limited to: date data century recognition, calculations that accommodate same
century and multi-century formulas and date values, and date data interface
values that reflect the century.  The Software and related hardware shall be
used by SBCL prior to, during and after the calendar year 2000.  The
Specifications of the Software and related hardware to ensure Year 2000
compliance shall be supplied by ACTAMED at no additional cost to SBCL.

     6.3   AVOIDANCE OF INFRINGEMENT.  In performing Services under this
Agreement, ACTAMED agrees to avoid designing or developing any items that
infringe any patents, copyrights or other intellectual property rights of any
third party.  If SBCL or ACTAMED becomes aware of any such possible infringement
in the course of performing work under any SOW issued hereunder, SBCL or
ACTAMED, as the case may be, shall immediately so notify the other party in
writing.


                                         -10-
<PAGE>

     6.4   INDEMNIFICATION.

           (a)   SBCL and ACTAMED, respectively, shall indemnify and hold the
other party harmless from and against all loss, liability, costs, charges,
claims or damages to any persons or property, arising out of this Agreement, a
SOW or the provision of the Services or Deliverables where caused by its own
fault or negligence, or the fault or negligence of its officers, employees,
contractors, representatives or agents.  SBCL and ACTAMED also shall indemnify
and hold the other party harmless from and against all loss, liability, costs,
charges, claims or damages which may arise as a consequence of or grow out of
any injury, illness or death of its officers, employees, contractors,
representatives or agents who are engaged in the performance of the Services
under this Agreement or a SOW.

           (b)   ACTAMED shall defend or settle, at its own expense, any and
all suits, actions, proceedings or claims against SBCL charging that any part of
the Services infringes any patent, trademark, trade secret, copyright or other
intellectual property right of any person or entity.  SBCL and ACTAMED shall
defend or settle, each at its own expense, any and all suits, actions,
proceedings or claims against the other party charging that the use, copying,
modification, disclosure or distribution of any part of the Deliverables or
Documentation provided by SBCL or ACTAMED, as the case may be, infringes any
patent, trademark, trade secret, copyright or other intellectual property right
of any person or entity not a party hereto.  Each party will pay actual costs of
the other party, including all legal fees and any damages awarded in any such
suit or proceeding, and will indemnify and hold that other party harmless from
all other liability incurred in connection with such action.

           (c)   SBCL and ACTAMED each agree to (i) promptly notify the other
party in writing of any claim for which it is seeking indemnification; (ii) at
the other party's request and expense, give assistance reasonably required for
the defense of any such claim; and (iii) give the other party control of the
defense and/or settlement of such claim; PROVIDED, HOWEVER, that the other party
may participate in such defense and/or settlement at its option and expense.

           (d)   If any part of the Services or Deliverables is or is likely to
become the subject of such a suit, action or claim, at no expense to the other
party, SBCL or ACTAMED may: (i) obtain sufficient rights to allow the other
party to use the Services or Deliverables as contemplated hereunder; or (ii)
substitute non-infringing services or deliverables acceptable to the other party
and substantially similar to the Services and Deliverables described in the SOW.
Any such replacement services and deliverables shall be subject to all of the
terms and conditions of this Agreement, including without limitation, the
foregoing indemnification provisions.

     6.5   SURVIVAL.  The provisions of this Section shall survive the
termination of this Agreement.


                                         -11-
<PAGE>

                                     ARTICLE VII
                                 TERM AND TERMINATION

     7.1   TERM.  This Agreement shall commence on the date hereof and shall 
remain in force for a period of one (1) year unless sooner terminated as 
provided herein; PROVIDED, HOWEVER, this Agreement shall remain in effect 
with respect to any Statements of Work already issued hereunder at the time 
of such termination until such Statements of Work are themselves terminated 
and/or performance thereunder is completed.

     7.2   TERMINATION OF SOWS.  SBCL may terminate any or all SOWs
outstanding, or any portion thereof, upon fifteen (15) business days' written
notice in the event that SBCL reasonably determines that ActaMed has failed to
meet any of the milestone dates for completing a phase of work, as set forth in
the project plan for the applicable SOW; provided however, that SBCL
acknowledges that ActaMed's timely performance may be dependent upon SBCL's
timely performance, and therefore SBCL may not so terminate if ActaMed's failure
to meet a milestone date is (i) the result of SBCL's failure to timely perform,
or (ii) because the parties are still engaged in the testing and acceptance
process for that milestone.  Upon receipt of notice of such termination, ACTAMED
shall inform SBCL of the extent to which performance has been completed through
such date, and collect and deliver to SBCL whatever work product then exists in
the manner prescribed by SBCL.  Subject to Section 4.2(c), ACTAMED shall be paid
for all work performed and accepted through the date of termination, provided
that such payment shall not be greater than the payment that would have become
due if the work had been completed.  ACTAMED may not terminate any SOW once
ACTAMED has entered into such SOW.

     7.3   TERMINATION OF AGREEMENT.  SBCL or ACTAMED may terminate this 
Agreement for cause, as provided below, upon [*] prior written notice.  SBCL 
and ACTAMED may terminate this Agreement or any SOW at any time upon mutually 
written agreement.  This Agreement shall continue to remain in effect with 
respect to any SOW already issued hereunder until such SOW is itself 
terminated and/or performance thereunder is completed.

     7.4   TERMINATION IN THE EVENT OF BREACH.  In the event of any material 
breach of this Agreement or a SOW by either party, the other party may 
terminate this Agreement or the applicable SOW without waiving any remedies 
or rights available to such other party at law or in equity.  Such 
termination shall be in writing upon at least [*] prior written notice to the 
party in breach specifying the nature of the breach.  The party in breach 
shall have the opportunity to cure such breach during such [*] period.  If 
the breach has been cured by the end of such period, this Agreement and the 
applicable SOW will not terminate.

     7.5   INSOLVENCY.  Either party may immediately terminate this Agreement
if the other party is declared insolvent or bankrupt; the property of the other
party  is assigned for the benefit of creditors, levied upon under execution, or
seized by virtue of any writ of any court of law; a petition for declaration of
bankruptcy or reorganization is filed against the other party in any court and
not dismissed in ninety (90) days; or a trustee or receiver is appointed for the
other party.  In the event of any such insolvency or bankruptcy, all licenses
granted hereunder shall be considered licenses to


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -12-
<PAGE>

intellectual property, and SBCL shall be entitled to retain the licenses granted
herein, subject to ACTAMED's right to terminate this Agreement for reasons other
than bankruptcy or insolvency as expressly provided in this Agreement.  In the
event that a court or other legal or administrative tribunal, directly or
through an appointed master, trustee or receiver, assumes partial or complete
control over the assets of a party to this Agreement based on the insolvency or
bankruptcy of such party, the bankrupt or insolvent party shall promptly notify
the court or other tribunal of the confidentiality obligations under this
Agreement, and that Confidential Information received from the other party under
this Agreement remains the property of the other party.  In addition, the
bankrupt or insolvent party shall, to the extent permitted by law, take all
steps necessary or desirable to maintain the confidentiality of the other
party's Confidential Information and to insure that the court, other tribunal or
appointee maintains such information in confidence in accordance with the terms
of this Agreement.

     7.6   CONSEQUENCES OF TERMINATION.  Upon termination of this Agreement,
ACTAMED shall:

           (a)   immediately cease work as provided in the notice of
termination, and shall cease to represent itself as providing services to SBCL;
and

           (b)   deliver to SBCL (i) a report describing the current state of
the Services and Deliverables to be provided by ACTAMED under this Agreement and
any applicable SOWs at the date of termination; (ii) all SBCL Confidential
Information in its possession; and (iii) all work product, Software, materials
and Documentation related to the Services and Deliverables in whatever state of
development they may exist on the date of termination.

                                     ARTICLE VIII
                                    MISCELLANEOUS

     8.1   FORCE MAJEURE.  Each party shall be excused from delays in
performing or from its failure to perform hereunder to the extent that such
delays or failures result from causes beyond the reasonable control of such
party; PROVIDED that, in order to be excused from delay or failure to perform,
such party must act diligently to remedy the cause of such delay or failure.

     8.2   NO AGENCY.  ACTAMED, in rendering performance under this Agreement
and any SOW, is acting solely as an independent contractor.  SBCL does not
undertake by this Agreement or otherwise to perform any obligation of ACTAMED,
whether by regulation or contract.  In no way is ACTAMED to be construed as the
agent or to be acting as the agent of SBCL in any respect.  ACTAMED has the sole
obligation to supervise, manage, contract, direct, procure, perform, or cause to
be performed all work to be carried out by ACTAMED hereunder.

     8.3   NO WAIVER.  No delay or omission by either party to exercise any
right arising upon any noncompliance with, or breach of, any covenant, condition
or agreement to be performed by the other party shall impair any such right or
be construed to be a waiver thereof.  A waiver by either of the parties hereto
of any noncompliance with, or breach of, any covenant, condition or agreement to
be performed by the other party must be in writing and signed by both parties.
No waiver of any


                                         -13-
<PAGE>

right upon any one occurrence of noncompliance or breach shall be construed to
be a waiver of any succeeding noncompliance or breach.  Unless stated otherwise,
all remedies provided for in this Agreement shall be cumulative and in addition
to and not in lieu of any other remedies available to either party at law, in
equity, or otherwise.

     8.4   SEVERABILITY.  If any term, covenant, condition or provision of this
Agreement or the application thereof to any circumstance shall be invalid or
unenforceable to any extent, the remaining terms, covenants, conditions and
provisions of this Agreement shall not be affected thereby and each remaining
term, covenant, condition and provision of this Agreement shall be valid and
enforceable to the fullest extent permitted by law.  If any provision of this
Agreement is so broad as to be unenforceable, such provision shall be
interpreted to be only as broad as is enforceable.

     8.5   NOTICES.  If one party is required or desires to give notice to the
other, such notice shall be deemed given if mailed by U.S.  mail, first class,
postage prepaid, or via a nationally recognized overnight carrier, with all
freight charges prepaid, and addressed as follows (or as subsequently noticed to
the other party):

If to SBCL:

SmithKline Beecham Clinical Laboratories, Inc.
1201 S. Collegeville Road
Collegeville, PA  19426
ATTN: [*]
      ----------------------------

If to ACTAMED:

ActaMed Corporation
7000 Central Parkway
Suite 600
Atlanta, GA  30328
ATTN: Mike Hoover
      ----------------------------

     8.6   ASSIGNMENT.  SBCL may assign all of its rights and obligations under
this Agreement, SOWs or any license granted hereunder to any Affiliate, or to
any corporation or other entity pursuant to a merger, consolidation, or other
reorganization.  SBCL agrees to notify ACTAMED of any such assignment, in
writing, specifying the name and address of the other entity.  ACTAMED may not,
without the prior written consent of SBCL, assign or transfer this Agreement or
any right or obligation hereunder, and any attempt to do so in contravention of
this Section 8.6 shall be void and of no force and effect.

     8.7   GOVERNING LAW; INTERPRETATION.  This Agreement and all SOWs shall be
construed, interpreted and enforced under the laws of the Commonwealth of
Pennsylvania, excluding its provisions regarding conflicts of law.  The section
and subsection headings used herein are for reference and convenience only, and
shall not enter into the interpretation hereof.


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -14-
<PAGE>

     8.8   ENTIRE AGREEMENT.  This Agreement, the SOWs issued from time to time
hereunder and the schedules and exhibits attached hereto or thereto, constitute
the entire agreement concerning the subject matter covered herein and supersede
all prior oral or written agreements, understandings and promises relating
thereto.  This Agreement may not be modified or amended except by an instrument
in writing declared to be an amendment hereto and executed by both parties.
This Agreement may be executed in several counterparts, all of which taken
together shall constitute one single agreement between the parties.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in the manner appropriate to each as of the day and year first above
written.

ACTAMED CORPORATION                SMITHKLINE BEECHAM CLINICAL
                                   LABORATORIES, INC.


By: /s/                            By: /s/
    ------------------------           --------------------------------
      Mike Hoover                        Rich Davis
      President                          Vice President
                                         Information Resources


Dated:   10/31/97                  Dated:   10/30/97
       ---------------------              -----------------------------




                                         -15-
<PAGE>

                                      EXHIBIT A

                                  STATEMENT OF WORK

     This is a Statement of Work entered into on this 31st day of October, 1997,
between SmithKline Beecham Clinical Laboratories, Inc., a Delaware corporation
with offices located at 1201 S. Collegeville Road, Collegeville, PA  19426
("SBCL"), and ActaMed Corporation, a Georgia corporation with offices located at
7000 Central Parkway, Suite 600, Atlanta, GA  30328 ("ACTAMED"), under the
Development Agreement, dated as of October 31, 1997.

1.   PROJECT MANAGERS:

     for SB:             [*]
                         1201 So. Collegeville Rd.
                         Collegeville, PA 19426
                         VOICE:  [*]
                         FAX:    [*]
                         E-MAIL:  [*]

     for ACTAMED:        [*]
                         7000 Central Parkway
                         Suite 600
                         Atlanta, Georgia 30328
                         VOICE:  [*]
                         FAX:    [*]
                         E-MAIL:  [*]

2.   GENERAL DESCRIPTION OF PROJECT:

     ACTAMED will "port" the SBCL Scan system to its ActaLink architecture,
     substantially re-engineering the system by re-writing most if not all of
     the source code, thereby creating a new product, "ACTALAB," which
     incorporates all of the requirements and functionality [*] of SBCL SCAN as
     depicted by the actual SBCL SCAN system and its associated documentation.

     This re-engineering will also incorporate ActaLink architecture,
     functionality and components as appropriate to create a fully integrated
     product that benefits from the functionality of the ActaLink product.  This
     will include functionality to perform an eligibility check at the time of
     order entry and to associate the resulting billing and eligibility
     information with each order for all payers available to ACTAMED.

     A complete description and overview of the project is provided as
     Attachment 1 to this Statement of Work, which includes:


[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -16-
<PAGE>

     -     Description of Specifications
     -     Description of Deliverables
     -     Description and Location of Services
     -     Project Schedule and Resources
     -     Testing procedures and Acceptance Criteria

3.   PAYMENT SCHEDULE

     For the Services and Deliverables to be provided hereunder, SBCL will pay
     ACTAMED the aggregate sum of [*] in accordance with the following schedule.
     The payment for each Deliverable shown below is due within [*] of receipt
     of the corresponding sign-off from SBCL, as set forth in more detail in 
     Attachment 1, Section 5.  The amount payable to ACTAMED by SBCL under this
     SOW is based on the estimates outlined in Attachment 2.

<TABLE>
<CAPTION>
     % OF TOTAL          AMOUNT           DELIVERABLE/MILESTONE
     ----------          ------           ---------------------
     <C>                 <C>              <C>
      [*]                [*]              [*]

      [*]                [*]              [*]

      [*]                [*]              [*]

      [*]                [*]              [*]

      [*]                [*]              [*]
</TABLE>


ACTAMED CORPORATION                SMITHKLINE BEECHAM CLINICAL
                                   LABORATORIES, INC.


By:   /s/                          By:   /s/
    ------------------------           --------------------------------
      Mike Hoover                        Rich Davis
      President                          Vice President
                                         Information Resources

Dated:   10/31/97                  Dated:   10/30/97
       ---------------------              -----------------------------




[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -17-
<PAGE>

                           AMENDMENT TO DEVELOPMENT AGREEMENT

SBCL and ActaMed hereby agree this 31st day of December, 1997, to amend their 
Development Agreement October 31, 1997, as set forth herein as of the 
effective dates set forth herein.

     1.   Effective as of the date of the Development Agreement, Article I of 
the Development Agreement is hereby amended to include the following 
additional or revised definitions:

          "ActaLab Software" has the meaning ascribed to it by the License 
     Agreement.

          "Deliverable" means all Software, Documentation and other materials 
     developed by ActaMed under this Agreement and described in a Statement of 
     Work.
  
          "License Agreement" means that certain License Agreement between 
     SBCL and ActaMed dated December 31, 1997.

          "SBCL Software" has the meaning ascribed to it by the License 
     Agreement.

          "SOW No. 1" shall mean the Statement of Work dated October 31, 1997.

     2.   The second "Whereas" clause is hereby deleted.

     3.   The fourth "Whereas" clause is hereby revised to delete the words 
"to SBCL."

     4.    Section 5.1(a) of the Development Agreement is hereby revised as 
of the date of the Development Agreement to read as follows:

                  (a)     the parties hereby acknowledge and agree that:

                          (i)   The Deliverables under SOW No. 1 do not 
     constitute modifications or enhancements to the SBCL Software, but 
     instead constitute a new Windows- and JAVA-based product which will be
     used in conjunction with and/or will be integrated into ActaMed's 
     ProviderLink software. All Deliverables (including but not limited to,
     the ActaLab Software) under SOW No. 1, and all intellectual property 
     rights (including but not limited to copyrights and all renewals and 
     extensions thereof) in such Deliverables, shall be owned solely and 
     exclusively by ActaMed. Subject to the provisions of Section 5(a)(iv) 
     hereof, SBCL hereby grants, transfers and assigns all of its right, title
     and interest in such Deliverables, including patents, copyrights, trade
     secrets and other

<PAGE>

     intellectual property developed or acquired in the course of creating 
     such Deliverables, to ActaMed and ActaMed shall have the right to obtain 
     and hold in its own name copyrights, patents, registrations and similar 
     protections which may be available with respect to such Deliverables.

                          (ii)   The parties contemplate that additional SOWs 
     may be entered into from time to time for the purpose of enhancing, 
     modifying or upgrading the ActaLab Software (an "ActaLab SOW"). All
     Deliverables under an ActaLab SOW and all intellectual property rights 
     (including but not limited to copyrights and all renewals and extensions
     thereof) in such Deliverables, shall be owned solely and exclusively by 
     ActaMed. Subject to the provisions of Section 5(a)(iv) hereof, SBCL hereby
     grants, transfers and assigns all of its right, title and interest in such 
     Deliverables, including patents, copyrights, trade secrets and other 
     intellectual property developed or acquired in the course of creating such
     Deliverables, to ActaMed and ActaMed shall have the right to obtain and
     hold in its own name copyrights, patents, registrations and similar 
     protections which may be available with respect to such Deliverables.

                          (iii)  The parties contemplate that additional SOWs 
     may be entered into from time to time for the purpose of enhancing, 
     modifying or upgrading the SBCL Software (a "SCAN Development SOW").
     Ownership of any Deliverables under a SCAN Development SOW, and ownership
     of any intellectual property rights therein (including but not limited to
     copyrights and all renewals and extensions thereof). shall be governed in
     all respects by Article 3 of the License Agreement. Subject to the 
     provisions of Section 5(a)(iv) hereof, ActaMed hereby grants, transfers
     and assigns all of its right, title and interest in such Deliverables, 
     including patents, copyrights, trade secrets and other intellectual 
     property developed or acquired in the course of creating such 
     Deliverables, to SBCL.

                          (iv)   Nothing in this Section 5(a) shall be 
     construed to transfer to ActaMed, or otherwise divest SBCL of SBCL's 
     ownership of, the SBCL Software and, subject to the licenses granted by the
     License Agreement, SBCL (as between SBCL and actaMed) shall be the sole 
     owner of the patents, copyrights, trade secrets and other intellectual 
     property rights therein. Nothing in this Section 5(a) shall be construed
     to transfer to SBCL, or otherwise divest ActaMed of ActaMed's ownership of,
     any software or work of authorship owned by ActaMed as of the effective 
     date of the Development Agreement and, subject to the licenses granted by
     the License Agreement, ActaMed (as between SBCL and ActaMed) shall be the
     sole owner of any patent, copyright, trade secret right or other 
     intellectual property right therein.

                          (v)    Any Statement of Work, by mutual agreement 
     of the parties, may include limitations and restrictions on ActaMed's use 
     of the applicable

                                     2

<PAGE>

Deliverables in support of laboratory testing services of commercial 
laboratories other than SBCL.

     6.   Sections 5.1(d) and (e) and Section 5.2(a) as of the date of this 
Amendment are hereby deleted from the Development Agreement.

     7.   In the event of conflict between the Development Agreement and the 
License Agreement, the License Agreement shall control.

     9.   Except as expressly set forth herein, the Development Agreement 
shall continue in full force and effect as originally executed by the parties.

     10.  Nothing in this Agreement shall be construed to modify or change in 
any respect the ownership and use rights with respect to Exclusive 
Developments (as defined in the Services Agreement between SBCL and ActaMed 
dated the date hereof) pursuant to the License Agreement and Section V of 
said Services Agreement.

          In witness whereof, the parties have caused this Amendment to be 
signed this 31st day of December, 1997.


SMITHKLINE BEECHAM CLINICAL                     ACTAMED CORPORATION
LABORATORIES, INC.

BY: /s/ John B. Okkenele Jr.                    BY: /s/ Michael K. Hoover
   ----------------------------                    ---------------------------
NAME: John B. Okkenele Jr.                      NAME: Michael K. Hoover
      -------------------------                       ------------------------
TITLE:      President                           TITLE:    President
       ------------------------                        -----------------------
DATE:       12-31-97                            DATE:     12-31-97
       ------------------------                        -----------------------

                                     3

<PAGE>

                 SECOND AMENDMENT TO DEVELOPMENT AGREEMENT

     SmithKline Beecham Clinical Laboratories, Inc. ("SBCL") and Healtheon 
Corporation ("Healtheon") hereby agree this 14th day of October, 1998, to 
amend the Development Agreement dated October 31, 1997, as amended, by and 
between ActaMed Corporation and SBCL, which was assumed by Healtheon on May 
18, 1998, as follows:

     1.   Section 7.1 of the Development Agreement is hereby replaced in its 
entirety by the following:

     "7.1 TERM. This Agreement shall commence on the date hereof and shall 
     remain in effect until October 31, 1999 or such later date as mutually 
     agreed upon by the parties for the purposes of completing the work 
     required under Statements of Work adopted hereunder."

SMITHKLINE BEECHAM CLINICAL             HEALTHEON CORPORATION
LABORATORIES, INC.

By:    /s/ Donald F. Parmen             By:    /s/ Jack Dennison
       ---------------------------             ---------------------------

Name:  Donald F. Parmen                 Name:  Jack Dennison
       ---------------------------             ---------------------------

Title: Assistant Secretary              Title: Vice President
       ---------------------------             ---------------------------

Date:  October 14, 1998                 Date:  October 14, 1998
       ---------------------------             ---------------------------



<PAGE>
               CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED 
                     AND FILED SEPARATELY WITH THE COMMISSION. 
                          CONFIDENTIAL TREATMENT HAS BEEN 
                  REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

                    SERVICES, DEVELOPMENT AND LICENSE AGREEMENT


       This Agreement made this 15th day of December, 1997 (the "Effective
Date"), is by and between Healtheon Corporation, a Delaware corporation with
offices at 87 Encina Ave., Palo Alto, CA 94301 ("Healtheon") and Beech Street
Corporation, a Georgia Corporation with offices at 173 Technology, Irvine,
California 92618 ("BSC").

       WHEREAS, the parties have agreed to form an alliance to address the
information technology needs of BSC, develop new applications designed to
address the information service needs of companies providing managed care and
other administrative services and pursue other ventures which may be of mutual
interest to the parties. The parties hereby agree as follows:

1.     DEFINITIONS.

       1.1     "ADDITIONAL APPLICATIONS" shall mean those applications which are
developed by Healtheon, but excluding the Developed Applications and the
Healtheon Platform Software, which are designed to run on the Healtheon
Platform.

       1.2     "BSH DIVISION" shall mean the division of Healtheon which shall
be organized to perform the Services hereunder.

       1.3     "BSC CLIENT" shall mean those clients of BSC including but not
limited to, health care medical providers (E.G., physicians, hospitals, other
care facilities, and ancillary providers), third party administrators, preferred
provider organizations, health maintenance organizations, employers, unions,
governmental entities, credit card companies, reinsurance companies, health
benefit or workers' compensation software vendors, and medical management
vendors, which use BSC Managed Care Services or as to which BSC has incorporated
such entities' services into BSC Managed Care Services.

       1.4     "BSC MANAGED CARE SERVICES" shall mean the following types of
services provided by BSC to BSC Clients: personal health management (demand
management), workers' compensation medical bill review, case management,
pre-admission review, concurrent review, discharge planning, hospital bill
audit, retrospective non-network bill review and fee negotiation, health care
provider contracting and management, data reporting, computer operations,
service bureau services, consulting and other support services and such other
related new products/services that BSC shall develop subsequent to the execution
of this Agreement.  Notwithstanding the foregoing, Managed Care Services shall
not include any service where the primary service provided by BSC is either (i)
access to and/or use of  the BSC On-Line Service to obtain repricing services or
(ii) other repricing services offered by BSC to BSC Clients which use all or a
portion of the repricing functionality of the Developed Applications  The
Management Committee shall determine whether services based upon other
functionality of the Developed Applications shall be excluded from the
definition of "BSC Managed Care Services" at the time that the relevant
specifications for such Developed Applications are being developed.
Notwithstanding the foregoing, workers' compensation medical bill review
services shall be included as part of the BSC Managed Care Services regardless
of whether such services are offered alone or in conjunction with other BSC
Managed Care Services.


<PAGE>

       1.5     "BSC ON-LINE SERVICE" shall mean the on-line service provided by
BSC to BSC Clients which incorporates all or a portion of the Developed
Applications and any derivative works thereof.

       1.6     "DEVELOPED APPLICATIONS" shall mean those applications and any
improvements thereto which are developed by Healtheon hereunder and which are
designed to run on the Healtheon Platform, as more fully described on Exhibit B.

       1.7     "DEVELOPMENT WORK"  shall mean the work to be performed hereunder
by Healtheon to develop the Developed Applications.

       1.8      "END USER" shall mean any employee, partner, agent or other
representative of (i) BSC,  or (ii)  a BSC Client; who is authorized to access
the BSC On-Line Service in conjunction with obtaining BSC Managed Care Services.

       1.9     "HEALTHEON PLATFORM" shall mean the Healtheon Platform Software,
as well as certain industry standard software applications, tools, and processes
which provide the operating environment which enables the use of Healtheon
developed applications as part of an on-line service which is accessible through
the Internet by using industry standard web browsers.

       1.10    "HEALTHEON PLATFORM SOFTWARE" shall mean the proprietary
operating system and other software which has been developed by Healtheon (but
excluding the Developed Applications and the Additional Applications) which is
part of the operating system of the Healtheon Platform.

       1.11    "SERVICES" shall mean those information technology services
described on Exhibit A.

2.     PERFORMANCE OF THE SERVICES AND THE DEVELOPMENT WORK


       2.1     PERFORMANCE OF THE SERVICES.  Healtheon, through personnel
assigned to its BSH Division, shall perform the Services at certain sites
controlled by BSC and/or Healtheon.  The initial scope of the Services is set
forth as Exhibit A.  Exhibit A may be amended with the written consent of the
parties.

       2.2     PERFORMANCE OF THE DEVELOPMENT WORK. Healtheon shall design,
develop, test, and complete the Developed Applications. The specifications for
each Developed Application shall be developed jointly and mutually approved by
the parties.  In conjunction with the development of each set of specifications,
the parties shall jointly develop a mutually agreeable detailed project plan,
which shall be attached hereto as Exhibit B.  Such project plan shall describe,
in a degree of detail reasonably satisfactory to the parties, all tasks and
responsibilities required for the successful and timely completion of the
development and delivery of the applicable Developed Applications, including the
projected costs.

3.     PROJECT MANAGEMENT

       3.1     PERSONNEL RESOURCES. Healtheon and BSC shall each commit the
number of qualified and experienced personnel which are reasonably necessary to
perform their respective obligations under this Agreement and as further
outlined in the project plan(s).  Healtheon shall have the sole right and
obligation to hire, supervise, manage, contract, direct, procure, perform or
cause to be performed all work to be performed by Healtheon and its personnel
hereunder. Healtheon, at its option, may engage third parties to render services
in connection with the performance of the Services and/or Development Work
contemplated hereunder, which may include engaging the services of certain BSC
employees to


                                          2
<PAGE>

provide certain information technology services. All Healtheon employees
utilized to provide the Services shall have entered into Healtheon's standard
form of employee nondisclosure agreement.

       3.2     PROJECT MANAGEMENT. Each party shall designate a project manager
(the "Project Managers") and appropriate technical resource persons to
coordinate the development and implementation of the project plan(s). The
Project Managers shall be responsible for resolving any matters arising under
this Agreement and the Services and Development Work contemplated hereunder.  In
the event that the Project Managers are not able to resolve a dispute, such
dispute shall be resolved by the Management Committee, as described in Section
3.3.

       3.3     MANAGEMENT COMMITTEE.   The parties shall each designate an equal
number of management-level personnel to serve on the Management Committee.  The
Management Committee shall conduct status meetings on a monthly basis detailing
the performance of the Services and Development Work during the prior four (4)
week period and the work planned to be performed during the upcoming four (4)
week period.  The Management Committee shall be responsible for resolving any
disputes which have not been resolved by the Project Managers.  The Management
Committee shall be responsible for determining whether services based upon the
Developed Applications shall be included or excluded from the definition of "BSC
Managed Care Services" for the purposes of this Agreement.  If such services are
not excluded, then the Management Committee shall be responsible for
establishing the applicable financial arrangements, if any, pursuant to which
such services may be offered by BSC.

       3.4     CHANGES TO SERVICES, DEVELOPMENT WORK AND PROJECT PLAN. The scope
of the Services, the Development Work and the project plans shall not be changed
in any material respect without the prior written agreement of the parties,
which agreement shall not be unreasonably withheld.

4.     OWNERSHIP AND LICENSE RIGHTS.

       4.1     OWNERSHIP. BSC acknowledges and agrees that all of the work
product produced or developed by Healtheon in connection with Healtheon's
performance of the Services and/or Development Work  to be provided hereunder,
including, but not limited to, all technology of any nature whatsoever, all
notes, records, drawings, designs, inventions, improvements, developments,
discoveries, trade secrets and any copyrightable material, including but not
limited, to the Developed Applications, and all patentable inventions,
conceived, made or discovered by Healtheon, solely or in collaboration with
others, during the period of this Agreement and which relate in any manner to
the Services and/or Development Work to be performed hereunder or which
Healtheon may be directed to undertake or investigate in performing the Services
and/or the Development Work, including any derivative works of any of the
foregoing (collectively the "Work Product"), is the sole property of Healtheon,
but excluding BSC's contracts and contracted rates with BSC's providers, which
may be incorporated into the Work Product.  Subject only to the license rights
to be granted by Healtheon to BSC in Section 5.1, below, BSC acknowledges and
agrees that Healtheon shall have all proprietary rights in and to the Work
Product, including, without limitation, all copyrights, patents and trade secret
rights, all moral rights, all contract and licensing rights, and all claims and
causes of action of any kind with respect to any of the foregoing, whether now
known or hereafter to become known, and that Healtheon shall have the sole and
exclusive right to use, modify and exploit the Work Product in any manner that
Healtheon may choose.

       4.2     PROPRIETARY NOTICES. BSC shall not remove or alter any trademark,
trade name, copyright, or other proprietary notices, legends, symbols, or labels
appearing on or in materials pertaining to the Work Product.  Each portion of
the Healtheon documentation reproduced by BSC shall include the


                                          3
<PAGE>

intellectual property notice or notices appearing in or on the corresponding
portion of such materials as delivered by Healtheon hereunder.


5.     LICENSE AND SERVICE RIGHTS.

       5.1     LICENSE RIGHTS. In consideration for the development fees paid to
Healtheon pursuant to Section 7.1, Healtheon hereby grants to BSC a nonexclusive
and nontransferable, fully-paid, perpetual right and license, exercisable at
BSC's primary operations site, to: (i) install, use, copy, modify, create
derivative works and maintain the Developed Applications, in object code and
source code form, solely as (a) part of the BSC On-Line Services which are
offered to BSC Clients in conjunction with the BSC Managed Care Services
obtained by such BSC Clients and to enable world-wide remote access by End Users
in conjunction with the BSC On-Line Service and (b) for BSC's internal use in
providing BSC Managed Care Services to BSC Clients, and (ii) use the Work
Product (excluding the Developed Applications and any derivative works thereof)
delivered to BSC by Healtheon hereunder in conjunction with the operations of
BSC's  Managed Care Services.  BSC shall not use, sublicense or otherwise
distribute the Healtheon Platform Software or the Work Product, including the
Developed Applications and any derivative works thereof, in any other manner
except as expressly stated herein.  The BSC's primary operations site is
anticipated to be in Irvine, California.  BSC may from time to time designate
another site to be its primary operations site by providing Healtheon with
thirty (30) days' prior written notice of such redesignation. Notwithstanding
the foregoing, BSC shall make no more than two (2) copies of the source code
relating to the Developed Applications (the "Source Code") and shall restrict
access to such Source Code to only those employees who require such access to
enable BSC to use the Source Code as in the manner contemplated herein and
otherwise secure and protect such Source Code consistent with its own practices
regarding its most highly confidential information.

       5.2     OPTION TO LICENSE ADDITIONAL APPLICATIONS. Healtheon hereby
agrees to grant to BSC a nonexclusive and nontransferable, right and license, to
use the Additional Applications as may be licensed at the option of BSC, as part
of the services to be offered to BSC Clients in conjunction with the BSC Managed
Care Services, and to enable worldwide access to End Users in conjunction with
the BSC On-Line Service. The fee for such license shall be [     *     ] each
such Additional Application as may be licensed by BSC, net of any third-party
royalty obligations.  Each such license agreement for Additional Applications
shall be on commercially reasonable terms and conditions.  BSC shall not use,
sublicense or otherwise distribute the Additional Applications in any other
manner except as expressly stated herein.

       5.3     OPTION TO LICENSE HEALTHEON PLATFORM SOFTWARE.  Subject to the 
payment of the license fee set forth below, Healtheon hereby grants to BSC a 
nonexclusive and nontransferable, right and license, exercisable at BSC's 
primary operational site, to use the Healtheon Platform Software as part of 
the Healtheon Platform to be deployed at BSC's primary operational site to 
run the Developed Applications and such Additional Applications which may be 
licensed from Healtheon, as part of the BSC On-Line service or other BSC 
Managed Care Service to be offered to BSC Clients in conjunction with the BSC 
Managed Care Services obtained by such BSC Client, and to enable world-wide 
access and use by End Users at remote locations in conjunction with the use 
of the BSC On-Line Service and to make a single back-up copy.  The applicable 
one-time, up front fee for such license shall be [     *     ] payable upon 
such commercially reasonable terms as the parties may agree to at the time of 
BSC's exercise of its rights hereunder.  BSC shall not have the right to use, 
sublicense or otherwise distribute the Healtheon Platform Software in any 
other manner except as

[ * ] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                          4

<PAGE>

expressly stated herein. BSC shall be solely responsible for the costs
associated with acquiring all third-party hardware and software and
implementation services necessary to deploy the Healtheon Platform at BSC's
site.  In the event the BSC exercises its rights hereunder, Healtheon shall make
available to BSC maintenance services on such commercially reasonable terms and
conditions as may be agreed to by the parties.

       5.4     OPTION TO USE HEALTHEON SERVICE.  If, following the completion 
of the Developed Applications, BSC declines to use its licensed rights under 
Section 5.1, Healtheon hereby agrees to enter into a Healtheon Service 
Agreement with BSC containing Healtheon's standard terms and conditions 
whereby Healtheon shall provide BSC and BSC Clients with access to an on-line 
service which includes the Developed Applications. Healtheon shall offer such 
service to BSC and the BSC Clients at a rate [     *     ] as may be mutually 
agreed to by the parties, based upon the actual margins of the on-line 
service.

6.     THIRD-PARTY TECHNOLOGY AND LICENSE RIGHTS

       6.1     THIRD-PARTY TECHNOLOGY AND LICENSE RIGHTS.  In order to perform
the Services contemplated hereunder (but excluding Services relating solely to
the Developed Applications), BSC represents that Healtheon will need to have
access only to the third-party technology and software listed on Exhibit C which
is licensed and/or deployed by BSC (the "Third-Party Technology and Software").
BSC hereby agrees to use commercially reasonable efforts to obtain, at its own
expense, all necessary consents, licenses and/or assignments which may be
necessary in order for Healtheon to perform the such Services.  Healtheon shall
use commercially reasonable efforts to cooperate with BSC to assist BSC in
obtaining any necessary consents, licenses and/or assignments to Third-Party
Technology and Software.  In the event that any Development Work requires access
to or use of any other third-party technology or software, the Management
Committee shall be responsible for  obtaining any necessary rights.


       6.2     BSC TECHNOLOGY AND LICENSE RIGHTS.  During the term of this
Agreement, BSC hereby grants to Healtheon a nonexclusive and nontransferable
right and license to use, modify and copy all technology and software owned by
BSC which is necessary for Healtheon to perform the Services and Development
Work.

7.     FEES AND PAYMENT; GAIN SHARING

       7.1     FEES AND EXPENSES, PAYMENT. BSC shall pay Healtheon the Fees and
Expenses, as set forth in Exhibit D for the Services and the Development Work to
be performed hereunder (the "Fees").  Healtheon shall submit invoices to BSC on
a bi-weekly  basis for the Fees when due, corresponding to applicable payroll
cycles. Invoices shall be due and payable within ten (10) days after receipt.

       7.2     OTHER EXPENSES. Healtheon shall have sole responsibility for
payment of compensation to its personnel and shall pay and report, for all
personnel assigned to perform services hereunder, federal and state income tax
withholding, social security taxes, and unemployment insurance applicable to
such personnel. Healtheon shall bear sole responsibility for any health or
disability insurance, retirement benefits, or other welfare or pension benefits
(if any) to which its own personnel may be entitled.

       7.3     REVENUE SHARING. In the event that BSC declines to use its
licensed rights under Section 5.1 and Healtheon provides services in accordance
with Section 5.4 for any current or future BSC Client

[ * ] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                          5

<PAGE>

which (i) utilizes any of the  Developed Applications and (ii) such BSC 
Client has entered into a written contract for one or more of BSC's Managed 
Care Services (a "Qualified BSC Client"), then BSC shall pay to Healtheon the 
Applicable Percentage (as defined below) of Net Revenues (as defined below 
with respect to repricing services) with respect to each such Qualified BSC 
Client. "Net Revenues" shall mean the revenues received by BSC from a 
Qualified BSC Client for BSC Managed Care Services less any fees paid by BSC 
to any third party which facilitates the sale or delivery of BSC's Managed 
Care Services, including but not limited to leased network fees, broker fees, 
commissions paid to outside third parties, fees payable to Healtheon pursuant 
to Section 5.4, subcontractor vendor fees and other such reasonable and 
customary fees as may apply from time to time.  The "Applicable Percentage" 
with respect to BSC's repricing services shall be as follows: [     *     ]  
The revenue sharing described above will be reviewed by the Management 
Committee periodically, and at least on an annual basis, to determine that 
the cost savings objectives are being achieved and to determine the 
appropriate applicable percentage for other BSC Managed Care Services which 
are performed through the Healtheon service as the applicable Developed 
Applications are deployed as part of the Healtheon service.  Additionally if 
other significant cost savings are identified they will be reviewed by the 
Management Committee to determine appropriate sharing.

       7.4     THIRD-PARTY HARDWARE AND SOFTWARE.  In the event that it is
reasonably necessary for Healtheon to purchase or license any third-party
hardware and/or software in order to perform the Services and/or the Development
Work, the Project Managers shall determine whether such third-party hardware
and/or software should be purchased and/or licensed by BSC or Healtheon and how
the costs and ownership shall be allocated between the parties.

       7.5     TAXES.  All Fees and payments are exclusive of all taxes, duties
or levies, however designated or computed.  BSC shall be responsible for and pay
all taxes upon payments due under this Agreement including, but not limited to,
sales, use, or value-added taxes, duties, withholding taxes and other
assessments now or hereafter imposed on or in connection with this Agreement,
exclusive of taxes based upon Healtheon's net income.

       7.6     AUDIT RIGHTS.  Each of the parties shall have the right,
exercisable no more frequently than once per calendar quarter and exercisable
upon thirty (30) days prior written notice, to audit the appropriate books and
records of the other party during regular business hours to review the
calculations of the amounts payable pursuant to Section 7.  The costs of such
audit shall be borne by the auditing party, unless the results of such audit
reveal an underpayment (or overpayment) of more than ten percent (10%) for a
twelve month period, in which case the reasonable expenses of the auditing party
shall be reimbursed by the other party.  The parties shall promptly pay (or
refund) to the other, the amounts of any underpayments (or overpayments).

8.     CONFIDENTIALITY

       8.1     CONFIDENTIAL INFORMATION.  The parties acknowledge that in the
course of performing under this Agreement, each party may be exposed to or
acquire information which is proprietary to or confidential to the other party,
its suppliers or customers ("Confidential Information"). Any and all such
Confidential Information of one party in any form obtained by the other party or
its employees, agents,

[ * ] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                          6

<PAGE>


or representatives in the performance of this Agreement shall be deemed to be
confidential and proprietary information of such party. The parties agree to
hold such Confidential Information in strict confidence, to only permit use of
such Confidential Information by its employees and agents having a need to know
in connection with performance under this Agreement, and not to copy, reproduce,
sell, assign, license, market, transfer, give or otherwise disclose the
Confidential Information of the other party to third parties or to use such
Confidential Information for any purposes whatsoever, except as expressly
contemplated by this Agreement, without the express written permission of the
other party and to advise each of their employees, agents, and representatives
of their obligations to keep such information confidential. Work Product shall
be deemed to be the Confidential Information of Healtheon.

       8.2     EXCEPTIONS TO CONFIDENTIAL INFORMATION. Confidential Information
shall not include information that (i) was, as of the time of its disclosure, or
thereafter becomes part of the public domain through a source other than the
receiving party; (ii) the receiving party can demonstrate was known to the
receiving party as of the time of its disclosure; (iii) the receiving party can
demonstrate was independently developed by the receiving party without use of
the Confidential Information; or (iv) the receiving party can demonstrate was
subsequently learned from a third party not under a confidentiality obligation
to the providing party.  In the event that a receiving party is required to
disclose certain Confidential Information of a disclosing party pursuant to
applicable law, court order or government authority, the receiving party shall
provide reasonable notice to the disclosing party prior to such disclosure and
shall cooperate with the disclosing party to obtain protection from such
disclosure.

9.     REPRESENTATIONS AND WARRANTIES

       9.1     WARRANTIES FOR SERVICES AND THE DEVELOPMENT WORK. Healtheon
hereby represents and warrants that (i) each person assigned to perform the
Services and/or the Development Work shall have the proper skill, training and
background so as to be able to perform the such Services and/or Development
Work in a competent and professional manner and (ii) all Services and/or
Development Work and any Work Product and other materials or documentation
delivered under this Agreement shall have been completed in a thorough and
professional manner.  In the event of a breach of Healtheon's representations
and warranties under this Section 9.1, Healtheon's sole obligation shall be to
promptly correct any defects identified by BSC, provided that BSC provides
Healtheon with written notice within thirty (30) days of becoming aware of the
defective work.

       9.2     THIRD-PARTY TECHNOLOGY.  BSC hereby represents and warrants that
it has obtained all necessary consents, licenses and/or assignments with respect
to the Third-Party Technology and Software which is licensed and/or deployed by
BSC and which are necessary in order for Healtheon to perform the Services and
Development Work to be performed hereunder.

       9.3     AUTHORITY.  Healtheon and BSC each hereby represents and warrants
to the other that it is duly organized and validly existing under the laws of
the jurisdiction in which it is organized, in good standing therein, and has the
power to enter into this Agreement and to perform its obligations hereunder and,
furthermore, that the performance by it of its obligations under this Agreement
has been duly authorized by all necessary corporate or other action and will not
violate any provision of law or regulation or of any corporate charter or
bylaws.

       9.4     INFRINGEMENT.  Healtheon and BSC each hereby represents and
warrants to the other that any information or technology provided by it to the
other party in order to define the specifications or to accomplish the
development objectives of this Agreement does not infringe, violate,
misappropriate, or


                                          7
<PAGE>

in any manner contravene or breach any U.S. patent or any trademark, copyright,
trade secret right, license or other property, or proprietary right of any third
party.

       9.5     NO IMPLIED WARRANTIES.  THE WARRANTIES STATED ABOVE IN THIS
SECTION 9 ARE THE ONLY WARRANTIES MADE BY EITHER PARTY. THE PARTIES DO NOT MAKE
AND HEREBY DISCLAIM ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
THE PARTIES ACKNOWLEDGES THAT COMPLEX COMPUTER SOFTWARE AND SERVICES, SUCH AS
THE DEVELOPED APPLICATIONS AND THE SERVICES, ARE RARELY FREE OF DEFECTS OR
ERRORS AND HEALTHEON DOES NOT WARRANT THE SAME.

10.    LIMITATION OF LIABILITY

       EXCLUSION OF CERTAIN DAMAGES. [     *     ] UNDER NO CIRCUMSTANCES AND 
UNDER NO LEGAL THEORY SHALL EITHER PARTY HAVE ANY LIABILITY FOR LOSS OF 
PROFITS, CONSEQUENTIAL, EXEMPLARY, INCIDENTAL OR PUNITIVE DAMAGES, EVEN IF 
SUCH PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

       10.2    LIMITATION OF LIABILITY.  [     *     ] IN NO EVENT SHALL 
EITHER PARTY'S AGGREGATE LIABILITY FOR ALL MATTERS ARISING OUT OF THE SUBJECT 
MATTER OF THIS AGREEMENT, WHETHER IN CONTRACT, TORT OR OTHERWISE [    *    ].
The remedies provided herein are the parties' sole and exclusive remedies.

11.    INDEMNIFICATION

       11.1    INDEMNIFICATION.  Healtheon agrees to hold harmless and defend
BSC from and against any and all claims, demands, suits, actions, or
proceedings, arising out of any actual or alleged infringement by Healtheon of
any copyright or any U.S. patent, trademark, or trade secret right or other
proprietary right, with respect to the Work Product and Healtheon Platform
Software, as delivered by Healtheon hereunder and used by BSC in accordance with
the terms of this Agreement.  BSC agrees to hold harmless and defend Healtheon
from and against any and all claims, demands, suits, actions, or proceedings,
arising out of any actual or alleged infringement by Healtheon of any copyright
or any U.S. patent, trademark, or trade secret right or other proprietary right
which arises out of BSC's failure to obtain any necessary consents, licenses, or
assignments with respect to any Third-Party Technology or Software which has
been licensed and/or deployed by BSC and which is necessary in order for
Healtheon to perform the Services (but excluding Services relating solely to the
Developed Applications).

       11.2    LIMITATIONS.  Healtheon shall have no indemnity obligation for
claims resulting from or alleged to result from (i) development work performed
by Healtheon in compliance with BSC's specifications where Healtheon's method of
compliance has been specifically compelled by the terms of BSC's specifications;
or (ii) BSC's use of the Work Product in combination with any hardware or
software not furnished by or authorized by Healtheon hereunder, if such
combination is the cause of such claim and the Work Product is not material to
the claim, or any modifications which have been made by BSC if such modification
is the cause of the claim.  In addition, Healtheon shall have no indemnity

[ * ] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                          8

<PAGE>

obligation for claims of infringement resulting or alleged to result from BSC's
failure within a reasonable time frame to implement any replacement or
modification which conforms to the requirements of Section 11.4 herein. BSC
shall have no indemnity obligations for claims resulting from or alleged to
result from Healtheon's breach of any Third-Party Technology or Software rights
where appropriate consents, licenses and/or assignments were obtained and
provided to Healtheon and Healtheon failed to adhere to the terms of applicable
consents, licenses and/or assignments.

       11.3    PAYMENT AND COOPERATION. Subject to the limitations set forth in
Section 11.2 above, the indemnifying party shall pay all losses, damages,
damages, settlements, expenses, costs and reasonable attorney's fees, incurred
by the indemnified party arising out of the matters set forth in Section 11.1
provided that such payment shall be contingent on: (i) cooperation by the
indemnified party with the indemnifying party in the defense and or settlement
thereof, at the indemnifying party's  expense; and (ii) allowing the
Indemnifying Party to control the defense and all related settlement
negotiations.  The indemnified party shall give the indemnifying party prompt
written notice of any such claim to enable the indemnifying party to defend or
mitigate the claim.

       11.4    REMEDY.  If, in the event of an infringement action pertaining to
the Work Product, including the Developed Applications, and/or Healtheon
Platform Software and BSC's use of the such Work Product and/or Healtheon
Platform Software is disrupted, Healtheon shall, at its option, (i) provide BSC
with access to software which is functionally equivalent to the infringing
elements of the Work Product and/or Healtheon Platform Software as applicable,
without additional charge; (ii) modify the infringing portions of the Work
Product and/or Healtheon Platform Software, as applicable, to avoid the
infringement; or (iii) obtain a license for BSC to continue use of such Work
Product and/or Healtheon Platform Software, as applicable, for the term of the
applicable license and pay, on an annual basis, if Healtheon elects not to
acquire a perpetual license, the additional fee required for such license(s).

       11.5    LIMITATIONS.  SECTION 11 SETS FORTH THE PARTIES' SOLE OBLIGATION,
AND THE SOLE RECOURSE AGAINST THE OTHER PARTY IN THE EVENT OF ANY CLAIM OF
INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS.

12.    TERM AND TERMINATION

       12.1.   TERM.  This Agreement shall continue for a fixed term of five 
(5) years from the date hereof (the "Term") unless terminated earlier under 
the provisions of this Section 12 or by the mutual agreement of the parties. 
Notwithstanding the foregoing, (i) the license granted in Section 5.1 shall 
have a perpetual term unless terminated earlier pursuant to Section 12.3 or 
12.4, or by the mutual consent of the parties; and (ii) the license granted 
in Section 5.3, if exercised, shall continue for a term of [     *     ] from 
the Effective Date and shall renew automatically for successive additional 
[     *     ] terms unless terminated earlier pursuant to Section 12.3 or 
12.4, or by the mutual consent of the parties.

       12.2    TERMINATION FOR CONVENIENCE. Either party may terminate this
Agreement upon one hundred-eighty (180) days prior written notice to the other
for any reason.   Promptly following the notice of termination the parties shall
use good faith efforts to agree to a commercially reasonable transition plan
which will enable the parties' to mitigate to on-going expenses during the
notice period.

       12.3    TERMINATION BY EITHER PARTY FOR DEFAULT.  If either party
defaults in the performance of any material provision of this Agreement, then
the non-defaulting party may give written notice to the defaulting party that if
the default is not cured within thirty (30) days of such notice the Agreement
will be terminated.  If the non-defaulting party gives such notice and the
default is not cured during the thirty

[ * ] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                          9

<PAGE>

(30) day period, then the Agreement shall automatically terminate at the end of
that thirty (30) day period.

       12.4    INSOLVENCY.  Either party may terminate this Agreement by written
notice to the other, and may regard the defaulting party as in default of this
Agreement, if the defaulting party becomes insolvent, makes a general assignment
for the benefit of creditors, suffers or permits the appointment of a receiver
for its business or assets, becomes subject to any proceeding under any
bankruptcy or insolvency law whether domestic or foreign, or has wound up or
liquidated, voluntarily or otherwise.

       12.5    EFFECT OF TERMINATION. The provisions of Sections 7 (solely with
respect to Fees and other payments which were due and payable as of the date of
termination), 4, 8, 10, 11, and 13 (to the extent applicable) shall survive the
termination of this Agreement for any reason.  All other rights and obligations
of the parties shall cease upon termination of this Agreement.  In the event of
a termination, neither party shall be entitled to any refund of the fees paid or
cost incurred for the development performed hereunder. Provided that this
Agreement is not terminated by Healtheon pursuant to either Section 12.3 or 12.4
or by BSC pursuant to Section 12.2, upon termination, Healtheon shall deliver to
BSC a copy of each Developed Application which has been completed as of the date
of termination, in source and object code form, and the related user
documentation, and, in the event of the exercise of BSC's option pursuant to
Section 5.3, Healtheon shall deliver to BSC a copy of Healtheon Platform
Software in object code form.

       12.6    RETURN OF MATERIALS. Within thirty (30) days after the
termination of this Agreement, each party shall return to the other, all
Confidential Information, and other material of any kind which is the property
of the other party.

13.        GENERAL

       13.1    NO EXCLUSIVITY OR RESTRICTION ON OTHER ACTIVITY.  Except as
expressly set forth in this Agreement, nothing herein shall preclude either
party from entering into agreements to obtain similar services or development
work from third parties or from providing similar services or development work
to third parties.

       13.2    RELATIONSHIP OF PARTIES.  The relationship of the parties shall
be that of independent contractors. Neither party will represent that it has any
authority to assume or create any obligation, express or implied, on behalf of
the other party, or to represent the other party as agent, employee, or in any
other capacity, except as specifically provided herein.

       13.3    BINDING EFFECT; ASSIGNMENT.  This Agreement shall be binding on
and inure to the benefit of the respective parties and their permitted
successors and assigns. Neither party shall not transfer, assign, sublicense or
subcontract any right or obligation hereunder, except as expressly provided
herein. In the event of a change in control of BSC, BSC shall be permitted to
assign this Agreement to the surviving or new corporation acquiring all or
substantially all of the business and assets of BSC by merger, acquisition,
consolidation or otherwise, with the prior written consent of Healtheon, which
consent shall not be unreasonably withheld.  BSC may assign its rights under
this Agreement to an entity which is controlled by BSC with the prior written
consent of Healtheon, which consent shall not be unreasonably withheld.  It
shall not be unreasonable for Healtheon to withhold its consent if any proposed
assignment would materially increase Healtheon's obligations under this
Agreement or materially increase the scope of BSC's rights (including but not
limited to the grant of rights contained in Section 5) or if such proposed
assignee is a competitor of Healtheon.


                                          10
<PAGE>

       13.4    NO WAIVER.  Either party's failure to exercise any right under
this Agreement shall not constitute a waiver of any other terms or conditions of
this Agreement with respect to any other or subsequent breach, nor a waiver by
such party of its right at any time thereafter to require exact and strict
compliance with the terms of this Agreement.

       13.5    NOTICES.  All notices or other communications which are required
or permitted to be given hereunder shall be in writing and shall be sent to the
address of the recipient set forth below or such other address as the recipient
may designate by notice given in accordance with the provisions of this Section
with copies to:


In the case of Healtheon:            In the case of BSC:

    Healtheon Corporation                Beech Street Corporation
    87 Encina Avenue                     173 Technology
    Palo Alto, California 94301          Irvine, California 92618
    Attn:  President                     Attn:  President and COO
    Copy to:  General Counsel            Copy to:  Chief Financial Officer

Any such notice shall be delivered by either (i) first class registered or
certified airmail, postage prepaid, and shall be deemed to have been served
forty-eight (48) hours after posting; or (ii) express courier service, service
fee prepaid, and shall be effective upon delivery.

       13.6    APPLICABLE LAW.  This Agreement shall be governed by and
construed in accordance with the laws of the State of California.

       13.7    SEVERABILITY.  The invalidity of one or more phrases, sentences,
clauses or articles contained in this Agreement shall not affect the remaining
portions of this Agreement or any part thereof; and in the event that one or
more phrases, sentences, clauses or articles shall be declared void or
unenforceable this Agreement shall be amended to include only such portions of
such phrases, sentences, clauses or articles that are not invalid, void or
unenforceable.

       13.8    ENTIRE AGREEMENT; AMENDMENTS.  This Agreement, along with the
Exhibits attached hereto, sets forth the entire agreement between the parties
and supersedes any other prior proposals, agreements and representations between
them related to its subject matter, whether written or oral, including but not
limited to the Letter of Intent between the parties.  No modifications or
amendments to this Agreement shall be binding upon the parties unless made in
writing and duly executed by authorized officials of both parties.

       13.9    ATTORNEYS FEES.  The prevailing party in any dispute shall be
entitled to collect from the other party the prevailing party's reasonable
attorneys' fees and costs in connection with the enforcement of this Agreement.

       13.10   NON-SOLICITATION OF EMPLOYEES.  Neither party shall solicit the
services or employment of any employee or agent of the other party for a period
beginning at the Effective Date and ending on the termination date of this
Agreement, without the prior written consent of the other party.  The soliciting
party, who violates this Section 13.10, shall pay to the other party an amount
equal to one (1) year's salary for any solicited employee of the other party, as
liquidated damages and not as a penalty.  The amount of annual salary shall be
the annual salary in effect at the date the employee was solicited.  For



                                          11
<PAGE>

purposes of this Section, the term "employee" means current or former 
employees of the other party who were employed by the other party at any time 
during the period beginning on the Effective Date and ending on the date on 
which the nonsolicitation period above terminates.  Initiation by an 
individual of contact regarding employment or response by an individual to an 
advertisement or other generally available notice, shall not constitute 
solicitation.

       13.11   BANKRUPTCY.  The parties agree that the Agreement and any related
agreements are contracts under which Healtheon is a licensor of rights to
intellectual property within the scope of Section 101 of the United States
Bankruptcy Code and that BSC shall have all the rights of a licensee set forth
in Section 365(n) of the Bankruptcy Code.  Upon the commencement of a bankruptcy
petition involving either party, the other party shall be entitled to retain and
may fully exercise all rights and licenses available under the Bankruptcy Code.

       13.12   USE OF NAME. Neither party shall use the name of the other party,
or refer to the other party, directly or indirectly, in any advertising, sales
presentation, news release, information provided to any profession or trade
publication, or any other promotional or informational material, for any purpose
whatsoever, or in any manner indicate any endorsement or support of any product,
without such party's prior written approval.

       13.13   RESIDUAL INFORMATION.  Without prejudice to either party's
proprietary rights, neither party shall be liable for using general ideas,
concepts and know-how that may be gained as a result of exposure to or contact
with the other party or its materials.

       13.14   ESCROW.  Healtheon agrees that it will put the Healtheon Platform
Software and the Developed Applications, as they are developed, in escrow with
an independent escrow agent.  The escrow agreement will be on terms and
conditions which are mutually agreeable to parties.

IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed
as of the day and year first written above.


          Healtheon Corporation             Beech Street Corporation



By:   /s/                            By:  /s/
   --------------------------------     --------------------------------

Title: President & CEO               Title:  President & CEO
      -----------------------------        -----------------------------

Date:  12/15/97                      Date:   12/15/97
   --------------------------------     --------------------------------


                                          12

<PAGE>

                                     EXHIBIT A

                                      SERVICES


Healtheon will operate and maintain BSC's information technology infrastructure
and data processing functionality and related services, including the following
types of services, as necessary and agreed to by the parties:
     -    maintain hardware operations
     -    maintain software infrastructure
     -    maintain data network(s)
     -    desktop computing
     -    provide internal and external technical support
     -    provide project planning and management
     -    software installation
     -    hardware installation
     -    provide user technical support
     -    provide user training
     -    provide IT personnel management services
     -    provide IT consulting services
     -    provide custom software solution design and development services


                                          13
<PAGE>

                                     EXHIBIT B

                             DEVELOPMENT WORK OVERVIEW

Healtheon shall provide an engineering team staffed with up to forty engineers
by December 31, 1998 to perform the general development tasks set forth below (
the "Development Team").  The Development Team will begin staffing during
January, 1998 and is anticipated to be fully staffed by December 31, 1998.
Unless otherwise agreed to by the parties, the Development Team will remain
fully staffed during calendar years 1999, 2000 and 2001 and will reduce its
staffing during calendar year 2002, depending upon the resources need to fulfill
the Development Work in accordance with the project plans which are developed by
the parties pursuant to Section 2.2.  In the event that the applicable project
plans, as they are agreed to by the parties pursuant to Section 2.2, require
additional personnel resources, the parties will revise the Development Team
staffing commitments hereunder.  The Development Team will develop the following
types of internet-based solutions, but not limited to, with the objective of
creating a Network Computing PPO/Managed Care capability:

- -    Claims Repricing
- -    Integrated Provider Management System
- -    Demand Management(Personal Health Management)
- -    Interfaces to internal and external systems (which are not "custom
     development")


Phase 1 of the Development Work will consist of developing appropriate Project
Plans and related design specifications and cost estimates to be approved by
Management Committee.  The work products of this phase will consist of:
          1.   An overall Project Plan;
          2.   Specific Project Plans and general specifications for Claims
               Repricing and Integrated Provider Management; and
          3.   General specifications for the Demand Management service and
               internet integration of the Demand Management service.

Phase 1 is anticipated to take approximately sixty work days to complete with
interim deliverables as tasks are completed and submitted to the Management
Committee for approval.


                                          14

<PAGE>

                                      EXHIBIT C

                         THIRD-PARTY TECHNOLOGY AND SOFTWARE


                                          15
<PAGE>

                                      EXHIBIT D

                                  FEES AND EXPENSES

1.   FEES AND EXPENSE FOR SERVICES AND "CUSTOM DEVELOPMENT" WORK.

     [     *     ] of the "costs" incurred by Healtheon which are associated 
with performing the Services and any "custom" development work performed on 
behalf of BSC.

     For the purposes of this Agreement, "Custom" development work shall mean
any development work performed to meet BSC's own specifications which is not
anticipated to be reusable for other Healtheon clients.

2.   FEES AND EXPENSE FOR DEVELOPMENT WORK FOR THE DEVELOPED APPLICATIONS

     [     *     ] of the "costs" incurred by Healtheon which are associated 
with developing the Developed Applications.

3.   DEFINITION OF "COST."

For the purposes of this Agreement "cost" shall be defined as follows:

     A.   For employees/contractors assigned to perform the Services and/or 
Development Work on a full-time basis, "cost" will include direct expenses 
(such as salary, benefits, recruiting, consulting, travel, etc.), support 
expenses (rent, phone, computing, office expenses) and allocated expenses 
(such as management, administration, other overhead cost, etc.).   The 
average hourly loaded cost per employee is currently approximately 
[     *     ] per hour.

     B.   For Healtheon's employees that are not assigned to perform the
Services and/or Development Work on a full-time basis, they will charge their
time performing or supporting the Services and/or Development Work based on a
set rate, which is subject to change based on the cost structure of Healtheon.
The initial rates are :-

     Level 1   [     *     ] per hour
     Level 2   [     *     ] per hour
     Level 3   [     *     ] per hour

     C.   For Healtheon's employees that are not generally assigned to perform
the Services and/or Development Work on a regular basis, they will charge their
time providing short term consulting services to this project based on a reduced
standard consulting rate.  The current rates, [     *     ] are :-

     Level 1   [     *     ] per hour
     Level 2   [     *     ] per hour
     Level 3   [     *     ] per hour

Cost for additional capital equipment or computer processing needed to perform
the Services or Development Work will be invoiced separately.

[ * ] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                          16


<PAGE>

                CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED 
                     AND FILED SEPARATELY WITH THE COMMISSION. 
                          CONFIDENTIAL TREATMENT HAS BEEN 
                  REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

                    SERVICES, DEVELOPMENT AND LICENSE AGREEMENT


     This Agreement made this 30th day of September, 1997 (the "Effective 
Date"), is by and between Healtheon Corporation, a Delaware corporation with 
offices at 87 Encina Ave., Palo Alto, CA 94301 ("Healtheon") and Brown & 
Toland Physician Services Organization, with offices at 1388 Sutter Street, 
Suite 400, San Francisco, CA 94109 ("B&T").

     WHEREAS, the parties have agreed to form an alliance to address the 
information technology needs of B&T, develop new applications designed to 
address the needs of physician practice groups, and pursue other ventures 
which may be of mutual interest to the parties. The parties hereby agree as 
follows:

1.   DEFINITIONS.

     1.1    "ADDITIONAL APPLICATIONS" shall mean those applications which are 
developed by Healtheon, but excluding the Developed Applications, which are 
designed to run on the Healtheon Platform.

     1.2    "BTH DIVISION" shall mean the division of Healtheon which shall 
be organized to perform the Services hereunder.

     1.3    "B&T SERVICE" shall mean B&T's physician practice management 
services, including the practice management services listed on Exhibit A.

     1.4    "DEVELOPED APPLICATIONS" shall mean those applications and any 
improvements thereto which are developed by Healtheon hereunder and which are 
designed to run on the Healtheon Platform.

     1.5    "DEVELOPMENT WORK"  shall mean the work to be performed hereunder 
by Healtheon to develop the Developed Applications.

     1.6     "END USER" shall mean any employee, partner, agent or other 
representative of a Physician Group who is authorized to access and use the 
B&T Service.

     1.7    "HEALTHEON PLATFORM" shall mean the Healtheon Platform Software, 
as well as certain industry standard software applications, tools, and 
processes which provides the operating environment which enables the use of 
Healtheon developed applications as part of an on-line service which is 
accessible through the Internet by using industry standard web browsers.

     1.8    "HEALTHEON PLATFORM SOFTWARE" shall mean the proprietary 
operating system and other software which has been developed by Healtheon 
which is part of the operating system of the Healtheon Platform.

     1.9    "PHYSICIAN GROUPS" shall mean those physician practice groups for 
which B&T provides the B&T Service.

     1.10   "SERVICES" shall mean those information technology services 
described on Exhibit B.

                                         -1-
<PAGE>

2.   PERFORMANCE OF THE SERVICES AND THE DEVELOPMENT WORK

     2.1    PERFORMANCE OF THE SERVICES.  Healtheon, through personnel assigned
to its BTH Division, shall perform the Services at certain sites controlled by
B&T and/or Healtheon.  The initial scope of the Services is set forth as Exhibit
B.  Exhibit B may be amended with the written consent of the parties.  Healtheon
shall perform the Services in accordance with the guidelines set forth in
Exhibit B.

     2.2    PERFORMANCE OF THE DEVELOPMENT WORK. Healtheon shall design,
develop and complete the Developed Applications. The specifications for each
Developed Application shall be developed jointly and mutually approved by the
parties.  In conjunction with the development of each set of specifications, the
parties shall jointly develop a mutually agreeable detailed project plan.  Such
project plan shall describe, in a degree of detail reasonably satisfactory to
the parties, all tasks and responsibilities required for the successful and
timely completion of the development and delivery of the applicable Developed
Applications.

3.   PROJECT MANAGEMENT

     3.1    PERSONNEL RESOURCES. Healtheon shall commit the number of qualified
and experienced personnel which are necessary to perform its obligations under
this Agreement and as further outlined in the project plan(s).  Healtheon shall
have the sole right and obligation to hire, supervise, manage, contract, direct,
procure, perform or cause to be performed all work to be performed by Healtheon
and its personnel hereunder. Healtheon may engage third parties to render
services in connection with the performance of the Services and/or Development
Work contemplated hereunder.

     3.2    MANAGEMENT BOARD.   The parties shall establish a project executive
committee consisting of three (3) senior level employees from each party (the
"Management Board").  The Management Board shall have overall project oversight
responsibility and management, shall establish appropriate project leadership,
and shall be responsible for resolving any matters arising under this Agreement
and the Services and Development Work contemplated hereunder.

     3.3    STATUS MEETINGS. The parties shall conduct status meetings on a
monthly basis detailing the performance of the Services and Development Work
during the period and the work planned to be performed during the upcoming four
(4) week period.

     3.4    CHANGES TO SERVICES, DEVELOPMENT WORK AND PROJECT PLAN. The scope
of the Services, the Development Work and the project plans shall not be changed
in any material respect without the mutual written agreement of the parties,
which agreement shall not be unreasonably withheld.

4.   OWNERSHIP AND LICENSE RIGHTS.

     4.1    OWNERSHIP. B&T acknowledges and agrees that all of the work product
produced or developed by Healtheon in connection with Healtheon's performance of
the Services and/or Development Work  to be provided hereunder, including, but
not limited to, all technology of any nature whatsoever, all notes, records,
drawings, designs, inventions, improvements, developments, discoveries, trade
secrets and any copyrightable material, including but not limited, to the
Developed Applications, and all patentable inventions, conceived, made or
discovered by Healtheon, solely or in collaboration with others, during the
period of this Agreement and which relate in any manner to the Services and/or
Development Work to be performed hereunder or which Healtheon may be directed to
undertake or investigate, or which Healtheon may become associated with in
performing the Services and/or the

                                         -2-
<PAGE>

Development Work, including any derivative works of any of the foregoing
(collectively the "Work Product"), is the sole property of Healtheon.  Subject
only to the license rights to be granted by Healtheon to B&T in Section 5.1,
below, B&T acknowledges and agrees that Healtheon shall have all proprietary
rights in and to the Work Product, including, without limitation, all
copyrights, patents and trade secret rights, all moral rights, all contract and
licensing rights, and all claims and causes of action of any kind with respect
to any of the foregoing, whether now known or hereafter to become known, and
that Healtheon shall have the sole and exclusive right to use, modify and
exploit the Work Product in any manner that Healtheon may choose.

     4.2    PROPRIETARY NOTICES. B&T shall not remove or alter any trademark,
trade name, copyright, or other proprietary notices, legends, symbols, or labels
appearing on or in materials pertaining to the Work Product.  Each portion of
the Healtheon documentation reproduced by B&T shall include the intellectual
property notice or notices appearing in or on the corresponding portion of such
materials as delivered by Healtheon hereunder.

5.   LICENSE AND SERVICE RIGHTS.

     5.1    LICENSE RIGHTS. Healtheon grants to B&T a nonexclusive and
nontransferable, fully-paid, right and license, exercisable at B&T's operational
site(s), to: (i) use the Developed Applications, in object code form, as part of
B&T's physician practice management services which are offered to the Physician
Groups; and (ii) use the Work Product (excluding the Developed Applications)
delivered to B&T hereunder in conjunction with the operations of B&T's physician
practice management services.  B&T shall not use, sublicense or otherwise
distribute the Work Product, including the Developed Applications, in any other
manner except as expressly stated herein. Notwithstanding the foregoing, nothing
herein shall be construed so as to limit or interfere with B&T's ability to use
the Developed Applications as part of the B&T Service to be offered to Physician
Groups, and to enable access and use by End Users in conjunction with the B&T
Service.

     5.2    OPTION TO LICENSE HEALTHEON PLATFORM SOFTWARE. Healtheon hereby 
agrees to grant to B&T a nonexclusive and nontransferable, right and license, 
exercisable at B&T's operational site(s), to use the Healtheon Platform 
Software as part of the Healtheon Platform to be deployed at B&T's primary 
operational site(s) to run the Developed Applications (and any Additional 
Applications which may be licensed from Healtheon), as part of the B&T 
Service to be offered to Physician Groups, and to enable access and use by 
End Users in conjunction with the B&T Service. The applicable one-time, 
up-front fees for such license(s) shall be [*] net of any third-party royalty 
obligations.  B&T shall not have the right to use, sublicense or otherwise 
distribute the Healtheon Platform Software in any other manner except as 
expressly stated herein. Notwithstanding the foregoing, nothing herein shall 
be construed so as to limit or interfere with B&T's ability to use the 
Developed Applications (and any Additional Applications which may be licensed 
from Healtheon) as part of the B&T Service to be offered to Physician Groups, 
and to enable access and use by End Users in conjunction with the B&T 
Service.  B&T shall be solely responsible for the costs associated with 
acquiring all third-party hardware and software and implementation services 
necessary to deploy the Healtheon Platform at B&T's sites.

     5.3    OPTION TO LICENSE ADDITIONAL APPLICATIONS. Healtheon hereby agrees
to grant to B&T a nonexclusive and nontransferable, right and license,
exercisable at B&T's primary operational site(s), to use the Additional
Applications as may be licensed at the option of B&T, as part of the B&T Service
to be offered to Physician Groups, and to enable access to End Users in
conjunction with the B&T Service.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -3-
<PAGE>

The one-time up-front fee(s) for such license(s) shall be [*] to each such 
Additional Application as may be licensed by B&T, net of any third-party 
royalty obligations.  B&T shall not use, sublicense or otherwise distribute 
the Additional Applications in any other manner except as expressly stated 
herein. Notwithstanding the foregoing, nothing herein shall be construed so 
as to limit or interfere with B&T's ability to use the Additional 
Applications which may be licensed from Healtheon as part of the B&T Service 
to be offered to Physician Groups, and to enable access and use by End Users 
in conjunction with the B&T Service.

     5.4    OPTION TO USE HEALTHEON SERVICE.  If, following the completion of
the Developed Applications, B&T does not elect to exercise its license rights
under Section 5.1, Healtheon hereby agrees to enter into a Healtheon Service
Agreement with B&T whereby Healtheon shall provide B&T and its Physician Groups
with access to an on-line service which includes the Developed Applications.
Healtheon shall offer such service to B&T and its Physician Groups at [*].

6.   THIRD-PARTY TECHNOLOGY AND LICENSE RIGHTS

     6.1    THIRD-PARTY TECHNOLOGY AND LICENSE RIGHTS.  In order to perform the
Services and/or Development Work contemplated hereunder, Healtheon may need to
have access to the third-party technology and software listed on Exhibit C (the
"Third-Party Technology and Software") which is licensed and/or deployed by B&T.
B&T hereby agrees to use its best efforts to obtain, at its own expense, all
necessary consents, licenses and/or assignment which may be necessary in order
for Healtheon to perform the Services and/or Development Work, as contemplated
hereunder.  In the event that B&T fails to obtain any such necessary consent,
license or assignment, B&T shall promptly notify Healtheon in writing and the
parties will work together to attempt to find a reasonable accommodation to
allow Healtheon to proceed with the work contemplated hereunder without
violating any third party rights.  In the event that the parties cannot find a
reasonable accommodation, neither party shall have any obligation to proceed
with any work which would infringe any third-party proprietary rights.
Healtheon shall use reasonable efforts to cooperate with B&T to assist B&T in
obtain any necessary consents, licenses and/or assignments.

     6.2    B&T TECHNOLOGY AND LICENSE RIGHTS.  B&T hereby grants to Healtheon
a right and license to use, modify and copy all technology and software owned by
B&T which is necessary for Healtheon to perform its obligations hereunder.

7.   FEES AND PAYMENT

     7.1    FEES AND EXPENSES, PAYMENT. B&T shall pay Healtheon the Fees and
Expenses, as set forth in Exhibit D for the Services and the Development Work to
be performed hereunder (the "Fees").  Healtheon shall submit invoices to B&T on
a monthly basis for the Fees when due. Invoices shall be due and payable within
ten (10) days after receipt.  The Fees may be changed with the written consent
of the parties.

     7.2    OTHER EXPENSES. Healtheon shall have sole responsibility for
payment of compensation to its personnel and shall pay and report, for all
personnel assigned to perform services hereunder, federal and state income tax
withholding, social security taxes, and unemployment insurance applicable to
such personnel. Healtheon shall bear sole responsibility for any health or
disability insurance, retirement benefits, or other welfare or pension benefits
(if any) to which its own personnel may be entitled.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -4-
<PAGE>

     7.3    THIRD-PARTY HARDWARE AND SOFTWARE.  In the event that it is
reasonably necessary for Healtheon to purchase or license any third-party
hardware and/or software in order to perform the Services and/or the Development
Work, the Management Board shall determine whether such third-party hardware
and/or software should be purchased and/or licensed by B&T or Healtheon and how
the cost shall be allocated between the parties.

     7.4    TAXES.  All Fees and payments are exclusive of all taxes, duties or
levies, however designated or computed.  B&T shall be responsible for and pay
all taxes upon payments due under this Agreement including, but not limited to,
sales, use, or value-added taxes, duties, withholding taxes and other
assessments now or hereafter imposed on or in connection with this Agreement,
exclusive of taxes based upon Healtheon's net income, except as noted in Section
7.2.

8.   CONFIDENTIALITY

     8.1    CONFIDENTIAL INFORMATION.  The parties acknowledge that in the
course of performing under this Agreement, each party may be exposed to or
acquire information which is proprietary to or confidential to the other party,
its suppliers or customers. Any and all such information of one party in any
form obtained by the other party or its employees, agents, or representatives in
the performance of this Agreement shall be deemed to be confidential and
proprietary information of such party. The parties agree to hold such
information in strict confidence, to only permit use of such information by its
employees and agents having a need to know in connection with performance under
this Agreement, and not to copy, reproduce, sell, assign, license, market,
transfer, give or otherwise disclose the confidential information of the other
party to third parties or to use such information for any purposes whatsoever,
without the express written permission of the other party and to advise each of
their employees, agents, and representatives of their obligations to keep such
information confidential. All such confidential and proprietary information
described herein in whatever form, including but not limited to the Work
Product, is hereinafter collectively referred to as "Confidential Information."
Work Product shall be deemed to be the Confidential Information of Healtheon.
B&T hereby agrees that it will not disclose any Confidential Information of
Healtheon to any person or entity who is not an employee of B&T, without
Healtheon's prior written consent and subject to such third party entering into
a confidentiality agreement with Healtheon in a form acceptable to Healtheon.

     8.2    EXCEPTIONS TO CONFIDENTIAL INFORMATION.  Notwithstanding the
obligations set forth in Section 8.1 above, the confidentiality obligations of
Healtheon and B&T shall not extend to information that (i) was, as of the time
of its disclosure, or thereafter becomes part of the public domain through a
source other than receiving party; (ii) the receiving party can demonstrate was
known to the receiving party as of the time of its disclosure; (iii) the
receiving party can demonstrate was independently developed by the receiving
party without use of the Confidential Information; or (iv) the receiving party
can demonstrate was subsequently learned from a third party not under a
confidentiality obligation to the providing party.  In the event that a
receiving party is required to disclose certain Confidential Information of a
disclosing party pursuant to court order or government authority, the receiving
party shall provide reasonable notice to the disclosing party prior to such
disclosure and shall cooperate with the disclosing party to obtain protection
from such disclosure.

9.   REPRESENTATIONS AND WARRANTIES

     9.1    WARRANTIES FOR SERVICES AND THE DEVELOPMENT WORK. Healtheon hereby
represents and warrants that (i) each person assigned to perform the Services
and/or the Development Work shall have

                                         -5-
<PAGE>

the proper skill, training and background so as to be able to perform the such
Services and/or  Development Work in a competent and professional manner and
(ii) all Services and/or Development Work and any work product and other
materials or documentation delivered under this Agreement shall have been
completed in a thorough and professional manner.  In the event of a breach of
Healtheon's representations and warranties under this Section 9.1, Healtheon's
sole obligation shall be to promptly correct any defects identified by B&T,
provided that B&T provides Healtheon with written notice within thirty (30) days
of becoming aware of the defective work.

     9.2    THIRD-PARTY TECHNOLOGY.  B&T hereby represents and warrants that it
will use its best effort to obtain all necessary consents, licenses and/or
assignments with respect to the third-party technology software which is
licensed and/or deployed by B&T and which are necessary in order for Healtheon
to perform the Services and Development Work to be performed hereunder.  In the
event that B&T has failed to obtain any necessary consent, license or
assignment, B&T shall have notified Healtheon in writing.

     9.3    AUTHORITY.  Healtheon and B&T each hereby represents and warrants
to the other that it is duly organized and validly existing under the laws of
the jurisdiction in which it is organized, in good standing therein, and has the
power to enter into this Agreement and to perform its obligations hereunder and,
furthermore, that the performance by it of its obligations under this Agreement
has been duly authorized by all necessary corporate or other action and will not
violate any provision of law or regulation or of any corporate charter or
bylaws.

     9.4    NO IMPLIED WARRANTIES.  THE WARRANTIES STATED ABOVE IN THIS SECTION
9 ARE THE ONLY WARRANTIES MADE BY EITHER PARTY. HEALTHEON DOES NOT MAKE AND
HEREBY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
B&T ACKNOWLEDGES THAT COMPLEX COMPUTER SOFTWARE AND SERVICES, SUCH AS THE
DEVELOPED APPLICATIONS AND THE SERVICES, ARE RARELY FREE OF DEFECTS OR ERRORS
AND HEALTHEON DOES NOT WARRANT THE SAME.

10.  LIMITATION OF LIABILITY

     10.1   EXCLUSION OF CERTAIN DAMAGES. [*] UNDER NO CIRCUMSTANCES AND 
UNDER NO LEGAL THEORY SHALL EITHER PARTY HAVE ANY LIABILITY FOR LOSS OF 
PROFITS, CONSEQUENTIAL, EXEMPLARY, INCIDENTAL OR PUNITIVE DAMAGES, EVEN IF 
SUCH PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

     10.2   LIMITATION OF LIABILITY.  [*] IN NO EVENT SHALL EITHER PARTY'S 
AGGREGATE LIABILITY FOR ANY MATTER ARISING OUT OF THE SUBJECT MATTER OF THIS 
AGREEMENT, WHETHER IN CONTRACT, TORT OR OTHERWISE, EXCEED THE AMOUNT OF THE 
FEES PAID FOR THE PARTICULAR SERVICES OR DEVELOPMENT WORK WHICH GAVE RISE TO 
SUCH CLAIM UNDER THIS AGREEMENT. The remedies provided herein are the 
parties' sole and exclusive remedies.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -6-
<PAGE>

11.  INDEMNIFICATION

     11.1   INDEMNIFICATION.  Healtheon agrees to hold harmless and defend B&T
from and against any and all claims, actions, or proceedings, arising out of any
actual or alleged infringement by Healtheon of any copyright or any U.S. patent,
trademark, or trade secret right or other proprietary right, with respect to the
Work Product, as delivered by Healtheon hereunder and used by B&T in accordance
with the terms of this Agreement.  B&T agrees to hold harmless and defend
Healtheon from and against any and all claims, actions, or proceedings, arising
out of any actual or alleged infringement by Healtheon of any copyright or any
U.S. patent, trademark, or trade secret right or other proprietary right which
arises out of B&T's failure to obtain any necessary consents, licenses, or
assignments with respect to any third-party technology or software which has
been licensed and/or deployed by B&T and which is necessary in order for
Healtheon to perform its obligations hereunder ("B&T Third-Party Technology
Rights").

     11.2   LIMITATIONS.  Healtheon shall have no indemnity obligation for
claims resulting from or alleged to result from (i) development work performed
by Healtheon in compliance with B&T's specifications where Healtheon's method of
compliance has been compelled by the terms of B&T's specifications; or (ii)
B&T's use of the Work Product in combination with any hardware or software not
furnished by or authorized by Healtheon hereunder, if such combination is the
cause of such claim, or any modifications which have been made by B&T.  In
addition, Healtheon shall have no indemnity obligation for claims of
infringement resulting or alleged to result from B&T's failure within a
reasonable time frame to implement any replacement or modification which
conforms to the requirements of Section 11.4 herein. B&T shall have no indemnity
obligations for claims resulting from or alleged to result from Healtheon's
breach of any B&T Third-Party Technology Rights where appropriate consents,
licenses and/or assignments were obtained and Healtheon failed to adhere to the
terms of applicable consents, licenses and/or assignments.

     11.3   PAYMENT AND COOPERATION. Subject to the limitations set forth in
Section 11.2 above, the Indemnifying Party shall pay all damages settlements,
expenses, costs and reasonable attorney's fees, incurred by the Indemnified
Party arising out of the matters set forth in Section 11.1 provided that such
payment shall be contingent on: (i) prompt notice to the Indemnifying Party in
writing of such claim to enable it to defend or mitigate the same; (ii)
cooperation by the Indemnified Party with the Indemnifying Party in the defense
and or settlement thereof, at the Indemnifying Party's  expense; and (iii)
allowing the Indemnifying Party to control the defense and all related
settlement negotiations.

     11.4   REMEDY.  If, in the event of an infringement action pertaining to
the Work Product and B&T's use of the Work Product is disrupted, Healtheon
shall, at its option, (i) provide B&T with access to software which is
functionally equivalent to the infringing elements of the Work Product, without
additional charge; (ii) modify the infringing portions of the Work Product to
avoid the infringement; or (iii) obtain a license for B&T to continue use of the
Work Product for the term of this Agreement and pay for any additional fee
required for such license, subject to B&T's approval, which shall not be
unreasonably withheld.

     11.5   LIMITATIONS.  SECTION 11 SETS FORTH THE PARTIES' SOLE OBLIGATION,
AND THE SOLE RECOURSE AGAINST THE OTHER PARTY IN THE EVENT OF ANY CLAIM OF
INFRINGEMENT OF THIRD PARTY  INTELLECTUAL PROPERTY RIGHTS.

                                         -7-
<PAGE>

12.  TERM AND TERMINATION

     12.1.  TERM.  This Agreement shall continue for a fixed term of three (3)
years from the date hereof unless terminated earlier under the provisions of
this Section 12 or by the mutual written agreement of the parties.
Notwithstanding the foregoing, the licenses granted in Section 5.1 shall
continue for a term of [*] from the Effective Date and shall renew
automatically for successive additional [*] terms unless terminated earlier
pursuant to Section 12.3 or 12.4, or by the mutual written consent of the
parties.

     12.2   TERMINATION FOR CONVENIENCE. Either party may terminate this
Agreement upon one hundred twenty days (120) prior written notice to the other
for any reason.

     12.3   TERMINATION BY EITHER PARTY FOR DEFAULT.  If either party defaults
in the performance of any material provision of this Agreement, then the
non-defaulting party may give written notice to the defaulting party that if the
default is not cured within thirty (30) days of such notice the Agreement will
be terminated.  If the non-defaulting party gives such notice and the default is
not cured during the thirty (30) day period, then the Agreement shall
automatically terminate at the end of that period.

     12.4   INSOLVENCY.  Either party may terminate this Agreement by written
notice to the other, and may regard the defaulting party as in default of this
Agreement, if the defaulting party becomes insolvent, makes a general assignment
for the benefit of creditors, suffers or permits the appointment of a receiver
for its business or assets, becomes subject to any proceeding under any
bankruptcy or insolvency law whether domestic or foreign, or has wound up or
liquidated, voluntarily or otherwise.

     12.5   EFFECT OF TERMINATION. The provisions of Sections 7(with respect to
Fees and other payments which were due and payable as of the date of
termination), 4, 8, 10, 11, and 13 (to the extent applicable) shall survive the
termination of this Agreement for any reason.  All other rights and obligations
of the parties shall cease upon termination of this Agreement.  In the event of
a termination, neither party shall be entitled to any refund of the fees paid or
cost incurred for the development performed hereunder. Provided that this
Agreement is not terminated pursuant to Section 12.4 pursuant to B&T's
insolvency, upon termination, Healtheon shall deliver to B&T a copy of (i) each
Developed Application which has been completed as of the date of termination, in
object code form, and the related user documentation, and (ii) all portions of
Developed Applications which were under development but not yet completed as of
the date of termination, in object code form, and the related user
documentation, if any.  Materials delivered pursuant to Section 12.5(ii) shall
be delivered on an "as-is" basis.

     12.6   RETURN OF MATERIALS. Within thirty (30) days after the termination
of this Agreement, each party shall return to the other, all Confidential
Information, and other material of any kind which is the property of the other
party.

13.  GENERAL

     13.1   NO EXCLUSIVITY OR RESTRICTION ON OTHER ACTIVITY.  Except as
expressly set forth in this Agreement, nothing herein shall preclude either
party from entering into agreements to obtain similar services or development
work from third parties or from providing similar services or development work
to third parties.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.


                                         -8-
<PAGE>

     13.2   RELATIONSHIP OF PARTIES.  The relationship of the parties shall be
that of independent contractors. Neither party will represent that it has any
authority to assume or create any obligation, express or implied, on behalf of
the other party, or to represent the other party as agent, employee, or in any
other capacity, except as specifically provided herein.

     13.3   BINDING EFFECT; ASSIGNMENT.  This Agreement shall be binding on and
inure to the benefit of the respective parties and their permitted successors
and assigns. Neither party shall not transfer, assign, sublicense or subcontract
any right or obligation hereunder, except as expressly provided herein.

     13.4   NO WAIVER.  Either party's failure to exercise any right under this
Agreement shall not constitute a waiver of any other terms or conditions of this
Agreement with respect to any other or subsequent breach, nor a waiver by such
party of its right at any time thereafter to require exact and strict compliance
with the terms of this Agreement.

     13.5   NOTICES.  All notices or other communications which are required or
permitted to be given hereunder shall be in writing and shall be sent to the
address of the recipient set forth below or such other address as the recipient
may designate by notice given in accordance with the provisions of this Section
with copies to:

In the case of Healtheon:               In the case of B&T:

     Healtheon Corporation              Brown & Toland
     87 Encina Avenue                   1388 Sutter Street, Suite 400
     Palo Alto, California 94302        San Francisco, CA 94109
     Attn: President                    Attn: President
     Copy to: General Counsel           Copy to: General Counsel

Any such notice shall be delivered by either (i) first class registered or
certified airmail, postage prepaid, and shall be deemed to have been served
forty-eight (48) hours after posting; or (ii) express courier service, service
fee prepaid, and shall be effective upon delivery.

     13.6   APPLICABLE LAW.  This Agreement shall be governed by and construed
in accordance with the laws of the State of California.

     13.7   SEVERABILITY.  The invalidity of one or more phrases, sentences,
clauses or articles contained in this Agreement shall not affect the remaining
portions of this Agreement or any part thereof; and in the event that one or
more phrases, sentences, clauses or articles shall be declared void or
unenforceable this Agreement shall be amended to include only such portions of
such phrases, sentences, clauses or articles that are not invalid, void or
unenforceable.

     13.8   ENTIRE AGREEMENT; AMENDMENTS.  This Agreement, along with the
Exhibits attached hereto, sets forth the entire agreement between the parties
and supersedes any other prior proposals, agreements and representations between
them related to its subject matter, whether written or oral.  No modifications
or amendments to this Agreement shall be binding upon the parties unless made in
writing and duly executed by authorized officials of both parties.


                                         -9-
<PAGE>


IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed
as of the day and year first written above.


       Healtheon Corporation                 Brown & Toland Physician
                                             Services Organization



By: /s/                                    By: /s/
   ---------------------------------          -------------------------------

Title: President and CEO                   Title: President
      ------------------------------             ----------------------------

Date:                                      Date:
      ------------------------------             ----------------------------


                                         -10-
<PAGE>


                                     EXHIBIT A

                                    B&T SERVICE

"B & T Services" shall mean B & T's physician practice, physician group
practice, and IPA management services which include, but not be limited to, the
following services:

- -    Claims processing, adjudication, eligibility, and encounter data
- -    Risk pool management
- -    Utilization management
- -    Authorization and referral management
- -    Care management including inpatient and outpatient case management
- -    Inpatient physician program management
- -    Disease management and wellness programs
- -    Provider credentialling
- -    Health plan member marketing
- -    Provider relations
- -    Health plan and provider contracting
- -    Quality management
- -    Practice management including office management, billing and collections
- -    Financial services including accounting, audit, budget, financial
     reporting, and taxes
- -    Medical group and IPA administration
- -    Capitation management
- -    Health Plan Member services

which are offered to "Physician Groups.


                                         -11-
<PAGE>


                                     EXHIBIT B

                                      SERVICES


- -    Operate, maintain and enhance B&T applications
- -    Operate and maintain B&T hardware and software infrastructure, network and
     desktop environment
- -    Provide technical support to internal and external B&T users
- -    Provide support for B&T new site implementations
       -    project planning and management
       -    solution design
       -    installation of hardware and software
       -    user technical support and training


                                         -12-
<PAGE>

                                      EXHIBIT C

                         Third-Party Technology and Software


                                         -13-
<PAGE>


                                     EXHIBIT D

                                 FEES AND EXPENSES


1.   Fee and Expenses for Services

B&T will pay [*] of all "cost" (as defined below) incurred by Healtheon in
performing the Services.

2.   Fee and Expenses for Development Work

B&T will pay [*] of all "cost" (as defined below) incurred by Healtheon in
performing the Development Work.


DEFINITION OF COST

Cost will include Healtheon's "fully loaded" cost (which include payroll,
benefit, support services, corporate overhead and other appropriate expenses)
for all full time employees assigned to the BTH Division, and all direct
expenses (consultants, contractors, recruiting expenses and fees, outside
services, travel, etc.).  For Healtheon's employees that are not assigned full
time to the Division, they will charged their time performing or supporting the
Services based on a set rate, which is subject to change based on the cost
structure of Healtheon.  The initial rates are:-

Level 1   [*] per hour
Level 2   [*] per hour
Level 3   [*] per hour

For Healtheon's employees that are not involved in this project, they will
charge their time providing short term consulting services to this project or
B&T based on [*].  The current rates are :-

Level 1   [*] per hour
Level 2   [*] per hour
Level 3   [*] per hour

Cost for additional capital equipment or computer processing needed to perform
the Services or Development Work will be paid by B&T.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION.  CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT 
TO THE OMITTED PORTIONS.

                                         -14-



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