HCIA INC
8-K, 1999-10-13
COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


Date of Report (Date of earliest event reported): August 11, 1999


                                    HCIA INC.
             (Exact name of registrant as specified in its charter)

<TABLE>
<CAPTION>
<S>                                             <C>                       <C>
             MARYLAND                           0-25378                   52-1407998
(State or other jurisdiction of               (Commission              (I.R.S. Employer
          incorporation)                      File Number)             Identification No.)


1300 EAST LOMBARD STREET
BALTIMORE,  MARYLAND                                                            21202
(Address of principal executive offices)                                    (Zip Code)
</TABLE>


Registrant's telephone number, including area code:  (410) 895-7470


                                 NOT APPLICABLE

(Former name or former  address,  if changed since last report) Exhibit Index on
Page 4


<PAGE>


ITEM 5.  OTHER EVENTS.

         On October  11,  1999,  HCIA Inc.,  a  Maryland  corporation  ("HCIA"),
announced that it will hold a special meeting of stockholders on Wednesday, Nov.
17, 1999, at 10 a.m. ET to approve its proposed merger with VS&A  Communications
Partners III, L.P. Stockholders of record as of the close of business on Oct. 8,
1999, will be entitled to receive notice of and to vote at the special meeting.

         Also on October 11, 1999, HCIA and VS&A Communications Partners III,
LP, entered into an Amended and Restated Agreement and Plan of Reorganization
which provides for the merger of HCIA with and into a limited liability company
subsidiary of VS&A. The original agreement and plan of reorganization provided
that HCIA would be the surviving company.

         A copy of the  press  release  of  HCIA  announcing  the  stockholders'
meeting is filed as Exhibit 99.1 hereto and is incorporated herein by reference.
A copy of the Amended and Restated Merger Agreement is filed as Exhibit 99.2 and
is incorporated herein by reference.


ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

99.1     Press Release

99.2     Amended and Restated Agreement and Plan of Reorganization


<PAGE>


                                   SIGNATURES


         Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended,  the  Registrant has duly caused this Report to be signed on its behalf
by the undersigned thereunto duly authorized.


                                              HCIA Inc.




Date:  October 12, 1999                       By: /s/ Barry C. Offutt
                                                 -----------------------
                                                 Barry C. Offutt
                                                 Senior Vice-President,
                                                 and Chief Financial Officer

<PAGE>


                                  EXHIBIT INDEX


Exhibit No.        Description
- -----------        -----------

99.1               Press Release

99.2               Amended and Restated Agreement and Plan of Reorganization



                                                                    EXHIBIT 99.1


                  HCIA Announces Date of Stockholder Meeting to
                     Approve Merger With VS&A Communications
                               Partners III, L.P.

Baltimore,  MD, Oct. 12, 1999 -- HCIA Inc. (NASDAQ:HCIA) today announced that it
will hold a special meeting of  stockholders on Wednesday,  Nov. 17, 1999, at 10
a.m. ET to approve its proposed  merger with VS&A  Communications  Partners III,
L.P. Stockholders of record as of the close of business on Oct. 8, 1999, will be
entitled  to  receive  notice  of and to  vote  at the  special  meeting.  It is
anticipated  that the proxy  statement  in  connection  with the meeting will be
distributed beginning on or about Oct. 12, 1999.

HCIA also announced that it has received early clearance of the merger under the
Hart-Scott-Rodino  Act. The merger  continues  to be subject to other  customary
conditions,  such as the correctness of representations and warranties set forth
in the merger  agreement.  It is currently  anticipated  that the closing of the
merger will take place on or about Nov. 23, 1999.

As previously announced,  pursuant to the merger agreement between HCIA and VS&A
Communications  Partners  III,  L.P.,  each share of HCIA  common  stock will be
converted into the right to receive $11.00 per share.

HCIA  Inc.   collects,   manages,   and  distributes   comparative  health  care
information.  Its  customers  deliver,  purchase,  and  manufacture  health care
products and services.  By combining industry leading databases,  methodologies,
and analytic  services,  HCIA  creates  information  assets that help  customers
manage health care costs and improve patient care.

VS&A  Communications  Partners III, L.P. is a $1.0 billion  private  equity fund
affiliated with Veronis,  Suhler & Associates Inc. VS&A Communications  Partners
III, L.P. focuses  exclusively on making equity  investments in the information,
communications and media industries.

SAFE HARBOR  STATEMENT  UNDER THE PRIVATE  SECURITIES  LITIGATION  REFORM ACT OF
1995: This press release, other than historical financial information,  consists
of  forward-looking  statements  within  the  meaning  of  Section  27A  of  the
Securities Act of 1933, as amended,  and Section 21E of the Securities  Exchange
Act of 1934,  as amended.  Those  statements  include  statements  regarding the
intent,  belief or  current  expectations  of the  Company  and its  management.
Prospective investors are cautioned that any such forward looking statements are
not  guarantees  of  future  performance  and  involve  a number  of  risks  and
uncertainties,  and that  actual  results  could  differ  materially  from those
indicated by such forward looking  statements.  Among the important factors that
could cause actual  results to differ  materially  from those  indicated by such
forward  looking  statements  are (i) that the  information  is of a preliminary
nature and may be subject to further  adjustment,  (ii)  variations in quarterly
results,  (iii) the  assimilation  of  acquisitions,  (iv) the management of the
Company's  growth  and  expansion,   (v)  dependence  on  key  personnel,   (vi)
development by competitors of new or superior  products or entry into the market
of new competitors,  (vii) dependence on major customers,  (viii)  dependence on
intellectual  property  rights,  (ix) integrity and reliability of the Company's
data,  (x) volatility of the Company's  stock price,  (xi) changes in the health
care  industry  from  both  a  regulatory  and  financial   perspective,   (xii)
implementation of required changes to computer systems and software for the year
2000,  and (xiii)  other  risks  identified  from time to time in the  Company's
reports and  registration  statements  filed with the  Securities  and  Exchange
Commission.  The  Company  assumes  no  obligation  to  update  the  information
contained in this press release, whether as a result of new information,  future
events or otherwise.
                                     # # #


                                                                    Exhibit 99.2



           AMENDED AND RESTATED AGREEMENT AND PLAN OF REORGANIZATION

                                 BY AND AMONG

                                   HCIA INC.


                    VS&A COMMUNICATIONS PARTNERS III, L.P.
                               VS&A-HCIA, L.L.C.

                                      AND

                                VS&A-HCIA, INC.


                          DATED AS OF OCTOBER 11, 1999

<PAGE>

                               TABLE OF CONTENTS


<TABLE>
<S>            <C>                                                                <C>
ARTICLE I THE MERGER ..........................................................   1
  SECTION 1.1 The Merger ......................................................   1
  SECTION 1.2 Closing .........................................................   1
  SECTION 1.3 Effective Time ..................................................   1
  SECTION 1.4 Effects of the Merger ...........................................   2
  SECTION 1.5 Limited Liability Company Agreement of the Surviving LLC ........   2
  SECTION 1.6 Stockholders' Meeting ...........................................   2
  SECTION 1.7 Directors and Officers of the Surviving LLC .....................   2
ARTICLE II EFFECT OF THE MERGER ON THE EQUITY INTERESTS OF THE CONSTITUENT
  ENTITIES EXCHANGE OF CERTIFICATES ..........................................    2
  SECTION 2.1 Effect on Capital Stock .........................................   2
     (a)       Cancellation of Treasury Stock and Acquiror-Owned Stock .......... 3
     (b)       Conversion of HCIA Common Stock .................................. 3
     (c)       Acquiror and LLC Equity Interests ................................ 3
     (d)       Options .......................................................... 3
  SECTION 2.2 Exchange of Certificates ........................................   3
     (a)       Exchange Agent ................................................... 3
     (b)       Exchange Procedures .............................................. 3
     (c)       No Further Ownership Rights in HCIA Common Stock ................. 4
     (d)       Termination of Exchange Fund ..................................... 4
     (e)       No Liability ..................................................... 4
     (f)       Investment of Exchange Fund ...................................... 4
     (g)       Lost Certificates ................................................ 4
ARTICLE III REPRESENTATIONS AND WARRANTIES ....................................   4
  SECTION 3.1 Representations and Warranties of Acquiror and the LLC ..........   4
     (a)       Organization, Standing and Corporate Power ....................... 4
     (b)       Authority; Noncontravention ...................................... 4
     (c)       Compliance with Applicable Laws; Litigation ...................... 5
     (d)       Brokers .......................................................... 5
     (e)       Ownership of HCIA Common Stock ................................... 5
     (f)       Full Disclosure .................................................. 6
  SECTION 3.2 Representations and Warranties of HCIA ..........................   6
     (a)       Organization, Standing and Corporate Power ....................... 6
     (b)       Subsidiaries ..................................................... 6
     (c)       Capital Structure ................................................ 6
     (d)       Authority; Noncontravention ...................................... 7
     (e)       SEC Documents; Undisclosed Liabilities ........................... 7
     (f)       Information Supplied ............................................. 8
     (g)       Absence of Certain Changes or Events ............................. 8
     (h)       Compliance with Applicable Laws; Litigation ...................... 9
     (i)       Absence of Changes in Benefit Plans .............................. 9
     (j)       Benefit Plans .................................................... 9
     (k)       Taxes ............................................................10
     (l)       Voting Requirements ..............................................11
     (m)       State Takeover Statutes ..........................................11
     (n)       Brokers ..........................................................11
     (o)       Opinion of Financial Advisor .....................................11
     (p)       Ownership of Acquiror Equity Interests ...........................11
     (q)       Intellectual Property ............................................11
     (r)       Certain Contracts ................................................13
     (s)       HCIA Rights Agreement ............................................14
     (t)       Environmental Liability ..........................................14
</TABLE>

                                       i
<PAGE>


<TABLE>
<S>                                                                       <C>
     (u)       Insurance .......................................................  14
     (v)       Transactions with Affiliates ....................................  15
     (w)       Employment Matters ..............................................  15
     (x)       Title and Condition of Properties ...............................  15
     (y)       Net Operating Loss Carryforwards ................................  15
     (z)       Full Disclosure .................................................  15
ARTICLE IV COVENANTS RELATING TO CONDUCT OF BUSINESS ...........................  15
   SECTION 4.1 Conduct of Business .............................................  15
     (a)       Conduct of Business by HCIA .....................................  15
     (b)       Other Actions ...................................................  17
     (c)       Advice of Changes ...............................................  17
   SECTION 4.2 No Solicitation by HCIA .........................................  17
ARTICLE V ADDITIONAL AGREEMENTS ................................................  18
   SECTION 5.1 Access to Information; Confidentiality ..........................  18
   SECTION 5.2 Best Efforts ....................................................  18
   SECTION 5.3 Indemnification, Exculpation and Insurance ......................  19
   SECTION 5.4 Fees and Expenses ...............................................  19
   SECTION 5.5 Public Announcements ............................................  20
   SECTION 5.6 Conveyance Taxes ................................................  20
   SECTION 5.7 Employee Benefits ...............................................  20
ARTICLE VI CONDITIONS PRECEDENT ................................................  20
   SECTION 6.1 Conditions to Each Party's Obligation to Effect the Merger ......  20
     (a)       Stockholder Approval ............................................  20
     (b)       Governmental, Regulatory and Other Approvals ....................  20
     (c)       No Injunctions or Restraints ....................................  20
   SECTION 6.2 Conditions to Obligations of HCIA ...............................  20
     (a)       Representations and Warranties ..................................  20
     (b)       Performance of Obligations of Acquiror ..........................  21
     (c)       Opinion .........................................................  21
     (d)       Certificate .....................................................  21
   SECTION 6.3 Conditions to Obligations of Acquiror ...........................  21
     (a)       Representations and Warranties ..................................  21
     (b)       Performance of Obligations of HCIA ..............................  21
     (c)       HCIA Rights Agreement ...........................................  21
     (d)       Opinion .........................................................  21
     (e)       Material Adverse Change .........................................  21
     (f)       Consents ........................................................  21
     (g)       Certificate .....................................................  21
ARTICLE VII TERMINATION, AMENDMENT AND WAIVER ..................................  21
   SECTION 7.1 Termination .....................................................  21
   SECTION 7.2 Effect of Termination ...........................................  22
   SECTION 7.3 Amendment .......................................................  23
   SECTION 7.4 Extension; Waiver ...............................................  23
ARTICLE VIII GENERAL PROVISIONS ................................................  24
   SECTION 8.1 Nonsurvival of Representations and Warranties ...................  24
   SECTION 8.2 Notices .........................................................  24
   SECTION 8.3 Definitions .....................................................  25
   SECTION 8.4 Interpretation ..................................................  25
   SECTION 8.5 Counterparts ....................................................  25
   SECTION 8.6 Entire Agreement; No Third-Party Beneficiaries ..................  25
   SECTION 8.7 Governing Law ...................................................  25
   SECTION 8.8 Assignment ......................................................  25
</TABLE>

                                       ii
<PAGE>


<TABLE>
<S>                                                                              <C>
   SECTION 8.9  Headings, Etc. .................................................  25
   SECTION 8.10 Severability ...................................................  25
   SECTION 8.11 Transfer and Similar Taxes .....................................  26
</TABLE>


                                      iii
<PAGE>

     THIS AMENDED AND RESTATED AGREEMENT AND PLAN OF REORGANIZATION (this
"Agreement") is dated as of October 11, 1999, among HCIA INC., a Maryland
corporation ("HCIA"), VS&A Communications Partners III, L.P., a Delaware
limited partnership ("Acquiror"), VS&HCIA, L.L.C., a Delaware limited
liability company wholly owned by the Acquiror and its affiliate, VS&A
Communication Parallel Partners III, L.P. (the "LLC"), and VS&HCIA, INC., a
Delaware corporation and a wholly owned subsidiary of the LLC (the "Merger
Sub").

                                  WITNESSETH:

     WHEREAS, the parties have entered into an agreement and plan of
reorganization dated as of August 11, 1999 (the "Original Merger Agreement")
providing, among other things, for the merger of Merger Sub into HCIA;

     WHEREAS, the parties wish to amend the Original Merger Agreement to
provide, among other things, for the merger of HCIA into the LLC instead of the
merger of Merger Sub into HCIA;

     WHEREAS, the Board of Directors of HCIA, the General Partner of Acquiror
and the Managing Member of the LLC (together, the "Constituent Entities") have
each approved the merger of HCIA with and into the LLC (the "Merger"), upon the
terms and subject to the conditions set forth in this Agreement, whereby each
issued and outstanding share of common stock, par value $.01 per share, of HCIA
("HCIA Common Stock," which reference shall be deemed to include the associated
HCIA Rights (as defined in Section 3.2(c)), other than shares owned by HCIA or
Acquiror, will be converted into the right to receive the Merger Consideration
(as defined in Section 2.1(b));

     WHEREAS, the Board of Directors of HCIA and the Managing Member of the LLC
have each approved the transactions contemplated by this Agreement;

     WHEREAS, pursuant to an agreement, dated as of August 11, 1999, as amended
as of the date hereof, among the Acquiror and certain stockholders of HCIA (the
"Voting Agreement"), such stockholders have agreed, pursuant to the terms and
conditions thereof, to vote all of the shares of HCIA Common Stock held by them
in favor of the Merger;

     WHEREAS, the Board of Directors of HCIA has resolved to recommend to its
stockholders the approval and adoption of this Agreement and the Merger and the
consummation of the transactions contemplated hereby upon the terms and subject
to the conditions set forth herein; and

     WHEREAS, HCIA and Acquiror desire to make certain representations,
warranties, covenants and agreements in connection with the Merger and also to
prescribe various conditions to the Merger.

     NOW, THEREFORE, in consideration of the representations, warranties,
covenants and agreements set forth herein, the parties agree as follows:


                                   ARTICLE I
                                   THE MERGER

     SECTION 1.1 THE MERGER. Upon the terms and subject to the conditions set
forth in this Agreement, and in accordance with the Maryland General
Corporation Law (the "MGCL") and the Delaware Limited Liability Company Act
(the "DLLCA"), HCIA shall be merged with and into the LLC at the Effective Time
(as defined in Section 1.3). Following the Effective Time, the separate
corporate existence of HCIA shall cease and the LLC shall be the successor or
surviving limited liability company in the Merger (the "Surviving LLC") and
shall succeed to and assume all the rights and obligations of HCIA in
accordance with the MGCL and the DLLCA.

     SECTION 1.2 CLOSING. The closing of the Merger (the "Closing") will take
place on a date to be specified by the parties (the "Closing Date"), which
shall be no later than the second business day after satisfaction or waiver of
the conditions set forth in Article VI, unless another time or date is agreed
to by the parties hereto. The Closing will be held at the offices of Whiteford,
Taylor & Preston L.L.P., Seven Saint Paul Street, Baltimore, Maryland
21202-1626.

     SECTION 1.3 EFFECTIVE TIME. Subject to the provisions of this Agreement,
as soon as practicable on the Closing Date, the parties shall cause the Merger
to be consummated by filing articles and certificates of merger or other
appropriate documents (in any such case, the "Certificate of Merger") executed
in accordance with the relevant provisions of the MGCL and the DLLCA and shall
make all other filings or recordings required under the MGCL and the DLLCA. The
Merger shall become effective at such time as the Certificate of Merger is duly
filed with the Delaware Secretary of State, or at such subsequent date or time
as HCIA and the LLC shall agree and specify in the Certificate of Merger (the
time the Merger becomes effective is hereinafter referred to as the "Effective
Time").


                                      1
<PAGE>

     SECTION 1.4 EFFECTS OF THE MERGER. The Merger shall have the effects set
forth in the MGCL and the DLLCA.

     SECTION 1.5 LIMITED LIABILITY COMPANY AGREEMENT OF THE SURVIVING LLC. At
the Effective Time, the limited liability company agreement of the LLC, as in
effect immediately prior to the Effective Time, shall be the limited liability
company agreement of the Surviving LLC, until thereafter amended in accordance
with applicable law.

     SECTION 1.6 STOCKHOLDERS' MEETING.

     HCIA, acting through its Board of Directors, shall, in accordance with
applicable law as promptly as practicable following the date of this Agreement:


      (a) duly call, give notice of, convene and hold a special meeting of its
   stockholders (the "HCIA Stockholders Meeting") as promptly as practicable
   following the execution of this Agreement for the purpose of considering
   and taking action upon the approval of the Merger and the adoption of this
   Agreement and shall, subject to the provisions of Section 4.2(b), recommend
   to its stockholders the approval of this Agreement, the Merger and the
   other transactions contemplated hereby;

      (b) prepare and file a definitive proxy statement with the Securities and
   Exchange Commission (the "SEC") and cause the definitive proxy statement,
   including any amendment or supplement thereto (the "Proxy Statement"), to
   be mailed to its stockholders relating to the merger and this agreement,
   provided that no amendment or supplement to the Proxy Statement shall be
   made by HCIA without consultation with the Acquiror and its counsel, and
   (y) to obtain the necessary approvals for the Merger and this Agreement
   from its stockholders; and

      (c) subject to the provisions of Section 4.2(b) hereof, (x) include in
   the Proxy Statement the recommendation of the Board of Directors that the
   stockholders of HCIA approve the Merger, this Agreement and the
   transactions contemplated hereby, (y) use its best efforts to solicit from
   stockholders of HCIA proxies in favor of approval and adoption of this
   Agreement and the Merger and to take all other actions necessary or in the
   Acquiror's reasonable judgment advisable to secure such vote and (z)
   cooperate with the Acquiror and the LLC with respect to each of the
   foregoing matters. Notwithstanding the foregoing, HCIA and its Board of
   Directors may take and disclose to stockholders a position contemplated by
   Rule 14e-2 promulgated under the Securities Exchange Act of 1934, as
   amended (the "Exchange Act"), if required to do so by the provisions of the
   Exchange Act applicable to HCIA, may comply with Rule 14d-9 promulgated
   under the Exchange Act if required to do so by the provisions of the
   Exchange Act applicable to HCIA, and may make all other disclosures
   required by the provisions of the Exchange Act applicable to HCIA.

      (d) If at any time prior to the Effective Time any information relating
   to Acquiror or HCIA, or any of their respective affiliates, officers or
   directors, should be discovered by Acquiror or HCIA which should be set
   forth in an amendment or supplement to the Proxy Statement, so that any
   document would not include any misstatement of a material fact or omit to
   state any material fact necessary to make the statements therein, in light
   of the circumstances under which they were made, not misleading, the party
   which discovers such information shall promptly notify the other parties
   hereto in writing and an appropriate amendment or supplement describing
   such information shall be promptly filed with the SEC and, to the extent
   required by law, disseminated to the stockholders of HCIA.

      (e) HCIA's obligations under this Section 1.6 shall at all times remain
   subject to the provisions of Sections 4.2(b), in the event that under the
   circumstances described therein, the Board of Directors of HCIA shall have
   received and accepted a Superior Proposal.

     SECTION 1.7 DIRECTORS AND OFFICERS OF THE SURVIVING LLC. The Managing
Member of the Surviving LLC shall, from and after the Effective Time, be the
Managing Member of the Surviving LLC until its successor shall have been duly
elected or appointed or qualified or until its resignation or removal in
accordance with the limited liability company agreement of the LLC.


                                   ARTICLE II
                  EFFECT OF THE MERGER ON THE EQUITY INTERESTS
                          OF THE CONSTITUENT ENTITIES;
                            EXCHANGE OF CERTIFICATES

     SECTION 2.1 EFFECT ON CAPITAL STOCK. As of the Effective Time, by virtue
of the Merger and without any action on the part of Acquiror, the LLC, HCIA or
the holder of any shares of the following securities:


                                      2
<PAGE>

      (a) CANCELLATION OF TREASURY STOCK AND ACQUIROR-OWNED STOCK. Each share
   of HCIA Common Stock that as of the Effective Time is owned by HCIA as
   treasury stock or is owned by Acquiror or the LLC shall automatically be
   canceled and retired and shall cease to exist, and no consideration shall
   be delivered in exchange therefor.

      (b) CONVERSION OF HCIA COMMON STOCK. Each issued and outstanding share of
   HCIA Common Stock (other than shares to be canceled in accordance with
   Section 2.1(a)), shall be converted into the right to receive $11.00 in
   cash, without interest (the "Merger Consideration"). As of the Effective
   Time, all such shares of HCIA Common Stock shall no longer be outstanding
   and shall automatically be canceled and retired and shall cease to exist,
   and each holder of a certificate representing any such shares of HCIA
   Common Stock shall cease to have any rights with respect thereto, except
   the right to receive the Merger Consideration.

      (c) ACQUIROR AND LLC EQUITY INTERESTS. At and after the Effective Time,
   each unit or other equity interest of Acquiror and the LLC issued and
   outstanding immediately prior to the Closing Date shall remain an issued
   and outstanding unit or other equity interest of Acquiror and the LLC and
   shall not be affected by the Merger.

      (d) OPTIONS. Except as otherwise agreed to in writing between HCIA and
   the holder of any option to purchase shares of HCIA Common Stock
   (collectively, the "HCIA Stock Options"), and as consented to by Acquiror,
   in its sole discretion, as of the Effective Time, each outstanding Option
   granted under the HCIA Stock Plans (as defined in Section 3.2(c)), whether
   or not then exercisable, shall be canceled by HCIA, and as of the Effective
   Time, the former holder thereof shall be entitled to receive from HCIA in
   consideration for such cancellation an amount in cash equal to the product
   of (i) the number of shares of HCIA Common Stock previously subject to such
   HCIA Stock Option (whether or not vested or exercisable) and (ii) the
   excess, if any, of the Merger Consideration per share over the exercise
   price per share of such HCIA Stock Option, such payments to be made at the
   option of the Acquiror on the Closing Date or as promptly as practicable
   following the Effective Time and in no event later than ten days following
   the Closing Date and to be reduced by the amount of withholding or other
   taxes required by law to be withheld by the Surviving LLC. Except as
   provided herein or as otherwise agreed by the parties, the HCIA Stock Plans
   shall terminate as of the Effective Time, and the provisions in any other
   plan, program or arrangement providing for the issuance or grant of any
   other interest in respect of the capital stock of HCIA or any of its
   subsidiaries shall be terminated as of the Effective Time so that on and
   after the Effective Time no holder of HCIA Stock Options shall have any
   option to purchase shares of capital stock or any other equity interest in
   HCIA and HCIA shall exercise its commercially reasonable best efforts to
   ensure that following the Effective Time, no current or former employee or
   director shall have any HCIA Stock Option to purchase shares of the HCIA
   Common Stock under any HCIA Stock Plan or otherwise. Prior to the Effective
   Time, the Board of Directors (or, if appropriate, any committee
   administering the HCIA Stock Plans) shall adopt such resolutions or take
   such actions as are necessary, subject if necessary, to obtaining consents
   of the holders of HCIA Stock Options, to carry out the terms of this
   Section 2.1(d).

     SECTION 2.2 EXCHANGE OF CERTIFICATES.

      (a) EXCHANGE AGENT. As of the Effective Time, Acquiror shall deposit, or
   shall cause to be deposited, with such bank or trust company as may be
   designated by Acquiror (the "Exchange Agent") for the benefit of the
   holders of HCIA Common Stock, cash in the aggregate amount equal to the
   product of (i) the number of shares of HCIA Common Stock outstanding
   immediately prior to the Effective Time (other than shares to be canceled
   pursuant to Section 2.1(a)) multiplied by (ii) the Merger Consideration
   (the "Exchange Fund").

      (b) EXCHANGE PROCEDURES. As soon as practicable after the Effective Time,
   the Exchange Agent shall mail to each holder of record of a certificate or
   certificates which immediately prior to the Effective Time represented
   outstanding shares of HCIA Common Stock (the "Certificates") whose shares
   were converted into the right to receive the Merger Consideration pursuant
   to Section 2.1, (i) a letter of transmittal (which shall specify that
   delivery shall be effected, and risk of loss and title to the Certificates
   shall pass, only upon delivery of the Certificates to the Exchange Agent,
   and shall otherwise be in customary form) and (ii) instructions for use in
   surrendering the Certificates in exchange for the Merger Consideration.
   Upon surrender of a Certificate for cancellation to the Exchange Agent,
   together with such letter of transmittal, duly executed, and such other
   documents as may reasonably be required by the Exchange Agent, the holder
   of such Certificate shall be entitled to receive in exchange therefor the
   amount of the Merger Consideration into which the number of shares of HCIA
   Common Stock previously represented by such Certificate(s) so surrendered
   shall have been converted pursuant to this Agreement, and the Certificate
   so surrendered shall forthwith be canceled. The Exchange Agent shall mail a
   check to such holder as soon as practicable after receipt of the
   appropriate documents. In the event of a surrender of a Certificate
   representing shares of HCIA Common Stock which are not registered in the
   transfer records of HCIA under the name of the person surrendering such
   Certificate, the Merger Consideration may be


                                      3
<PAGE>

   paid to a person other than the person in whose name the Certificate so
   surrendered is registered if such Certificate shall be properly endorsed or
   otherwise be in proper form for transfer and if the person requesting such
   surrender shall pay any transfer or other taxes required by reason of the
   payment of the Merger Consideration to a person other than the registered
   holder of such Certificate or establish to the satisfaction of Acquiror, in
   its sole discretion, that such tax has been paid or is not applicable.
   Until surrendered as contemplated by this Section 2.2, each Certificate
   shall be deemed at any time after the Effective Time to represent only the
   right to receive upon such surrender the Merger Consideration which the
   holder thereof has the right to receive in respect of such Certificate
   pursuant to the provisions of this Article II. No interest shall be paid or
   will accrue on the Merger Consideration payable to holders of Certificates
   pursuant to the provisions of this Article II.

      (c) NO FURTHER OWNERSHIP RIGHTS IN HCIA COMMON STOCK. The Merger
   Consideration paid upon the surrender for exchange of Certificates in
   accordance with the terms of this Article II shall be deemed to have been
   issued (and paid) in full satisfaction of all rights pertaining to the
   shares of HCIA Common Stock theretofore represented by such Certificates,
   and there shall be no further registration of transfers on the stock
   transfer books of the Surviving Corporation of the shares of HCIA Common
   Stock which were outstanding immediately prior to the Effective Time. If,
   after the Effective Time, Certificates are presented to Acquiror, the
   Surviving LLC or the Exchange Agent for any reason, they shall be canceled
   and exchanged as provided in this Article II.

      (d) TERMINATION OF EXCHANGE FUND. Any portion of the Exchange Fund which
   remains undistributed to the holders of the Certificates for six months
   after the Effective Time shall be delivered to Acquiror, upon demand, and
   any holders of the Certificates who have not theretofore complied with this
   Article II shall thereafter look only to Acquiror for payment of their
   claim for Merger Consideration,

      (e) NO LIABILITY. None of HCIA, Acquiror, the LLC, the Surviving LLC or
   the Exchange Agent shall be liable to any person in respect of any cash or
   other distribution payable from the Exchange Fund, in each case delivered
   to a public official pursuant to any applicable abandoned property, escheat
   or similar law.

      (f) INVESTMENT OF EXCHANGE FUND. The Exchange Agent shall invest cash
   included in the Exchange Fund, as directed by Acquiror, on a daily basis.
   Any interest and other income resulting from such investments shall be paid
   to Acquiror.

      (g) LOST CERTIFICATES. If any Certificate shall have been lost, stolen or
   destroyed, upon the making of an affidavit of that fact by the person
   claiming such Certificate to be lost, stolen or destroyed and; the posting
   by such person of a bond in such amount as the Surviving LLC may direct as
   indemnity against any claim that may be made against it with respect to
   such Certificate, the Exchange Agent shall issue in exchange for such lost,
   stolen or destroyed Certificate the Merger Consideration with respect to
   the shares of HCIA Common Stock formerly represented thereby.


                                  ARTICLE III
                        REPRESENTATIONS AND WARRANTIES

     SECTION 3.1 REPRESENTATIONS AND WARRANTIES OF ACQUIROR AND THE LLC .
Except as disclosed in the Disclosure Schedule delivered by Acquiror and to
HCIA on August 11, 1999 in accordance with the Original Merger Agreement (the
"Acquiror Disclosure Schedule"), Acquiror and the LLC jointly and severally
represent and warrant to HCIA as follows as of August 11, 1999 (unless another
date is specified, in which case as of such other date):

      (a) ORGANIZATION, STANDING AND CORPORATE POWER. Each of Acquiror and its
   subsidiaries (as defined in Section 8.3) is a corporation or other legal
   entity duly organized, validly existing and in good standing under the laws
   of the jurisdiction in which it is organized and has the requisite
   corporate or other power, as the case may be, and authority to carry on its
   business as now being conducted, except, as to subsidiaries, for those
   jurisdictions where the failure to be so organized, existing or in good
   standing individually or in the aggregate would not have a material adverse
   effect on Acquiror. Each of Acquiror and its subsidiaries is duly qualified
   or licensed to do business and is in good standing in each jurisdiction in
   which the nature of its business or the ownership, leasing or operation of
   its properties makes such qualification or licensing necessary, except for
   those jurisdictions where the failure to be so qualified or licensed or to
   be in good standing individually or in the aggregate would not have a
   material adverse effect on Acquiror.

      (b) AUTHORITY; NONCONTRAVENTION. Each of Acquiror, the LLC and the Merger
   Sub has or will have all requisite power and authority to enter into this
   Agreement and to consummate the transactions contemplated hereby. The
   execution and delivery of this Agreement by each of Acquiror, the LLC and
   the Merger Sub, and the consummation by Acquiror and the LLC of the
   transactions contemplated hereby, have been or will be duly authorized by,
   all necessary action on the part of Acquiror, the LLC and the Merger Sub.
   This Agreement has been or will be duly executed and


                                      4
<PAGE>

   delivered by Acquiror, the LLC and the Merger Sub and, assuming the due
   authorization, execution and delivery thereof by HCIA, constitutes (or will
   constitute, as the case may be) the legal, valid and binding obligation of
   Acquiror, the LLC and the Merger Sub, enforceable against Acquiror, the LLC
   and the Merger Sub in accordance with its terms. The execution and delivery
   of this Agreement by the Acquiror, the LLC and the Merger Sub does not, and
   the consummation of the transactions contemplated hereby and compliance
   with the provisions of this Agreement will not, conflict with, or result in
   any violation of, or default (with or without notice or lapse of time, or
   both) under, or give rise to a right of termination, cancellation or
   acceleration of any obligation or loss of a benefit under, or result in the
   creation of any lien, security interest or encumbrance ("Liens") upon any
   of the properties or assets of Acquiror or any of its subsidiaries or in
   any restriction on the conduct of Acquiror's business or operations under,
   (i) the certificate of limited partnership and the limited partnership
   agreement of Acquiror (the "Acquiror Certificate") or the comparable
   organizational documents of any of its subsidiaries, (ii) any loan or
   credit agreement, note, bond, mortgage, indenture, trust document, lease or
   other agreement, instrument, permit, concession, franchise, license or
   similar authorization applicable to Acquiror or any of its subsidiaries or
   their respective properties or assets or (iii) subject to the governmental
   filings and other matters referred to in the following sentence, any
   judgment, order, decree, statute, law, ordinance, rule or regulation
   applicable to Acquiror or any of its subsidiaries or their respective
   properties or assets, other than, in the case of clauses (ii) and (iii),
   any such conflicts, violations, defaults, rights, losses, restrictions or
   Liens that individually or in the aggregate would not (x) have a material
   adverse effect on Acquiror or (y) reasonably be expected to impair the
   ability of Acquiror or the LLC to perform its obligations under this
   Agreement. No consent, approval, order or authorization of, action by or in
   respect of, or registration, declaration or filing with, any federal,
   state, local or foreign government, any court, administrative, regulatory
   or other governmental agency, commission or authority or any
   nongovernmental self-regulatory agency, commission or authority (a
   "Governmental Entity") is required by or with respect to Acquiror or any of
   its subsidiaries in connection with the execution and delivery of this
   Agreement by Acquiror, or the consummation by Acquiror or the LLC of the
   transactions contemplated hereby, except for: (1) the filing of a
   pre-merger notification and report form by Acquiror under the
   Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
   Act"), or filings or notifications under the antitrust, competition or
   similar laws of any foreign jurisdiction; (2) the filing with the SEC of
   such reports under Sections 13(a), 13(d), 15(d) or 16(a) of the Exchange
   Act, as may be required in connection with this Agreement and the
   transactions contemplated hereby; (3) the filing of the Certificates of
   Merger with the Maryland State Department of Assessments and Taxation and
   the Secretary of State of the State of Delaware appropriate documents with
   the relevant authorities of other states in which Acquiror is qualified to
   do business and such filings with Governmental Entities as may be necessary
   to satisfy the applicable requirements of state securities or "blue sky"
   laws; and (4) such consents, approvals, orders or authorizations the
   failure of which to be made or obtained individually or in the aggregate
   would not (x) have a material adverse effect on Acquiror or (y) reasonably
   be expected to impair the ability of Acquiror or the LLC to perform its
   obligations under this Agreement.

      (c) COMPLIANCE WITH APPLICABLE LAWS; LITIGATION. As of August 11, 1999,
   no action, demand, requirement or investigation by any Governmental Entity
   and no suit, action or proceeding by any person, in each case with respect
   to Acquiror or any of its subsidiaries or any of their respective
   properties, is pending or, to the best knowledge (as defined in Section
   8.3) of Acquiror, threatened, other than, in each case, those the outcome
   of which individually or in the aggregate would not (A) have a material
   adverse effect on Acquiror or (B) reasonably be expected to impair the
   ability of Acquiror or the LLC to perform its obligations under this
   Agreement or prevent or materially delay the consummation of any of the
   transactions contemplated hereby or thereby.

      (d) BROKERS. Except for Veronis, Suhler & Associates Inc., no broker,
   investment banker, financial advisor or other person is entitled to any
   broker's, finder's, financial advisor's or other similar fee or commission
   in connection with the transactions contemplated by this Agreement based
   upon arrangements made by or on behalf of Acquiror.

      (e) OWNERSHIP OF HCIA COMMON STOCK. To the knowledge of Acquiror, as of
   August 11, 1999 or at any time within twelve months prior to August 11,
   1999, neither Acquiror nor any subsidiary thereof, other than pursuant to
   the Voting Agreement, (i) beneficially owns (as defined in Rule 13d-3 under
   the Exchange Act), directly or indirectly, or (ii) is party to any
   agreement, arrangement or understanding for the purpose of acquiring,
   holding, voting or disposing of, in each case, shares of capital stock of
   HCIA.


                                      5
<PAGE>

      (f) FULL DISCLOSURE. None of the representations or warranties made by
   Acquiror herein or in any schedule hereto, including the Acquiror
   Disclosure Schedule, or any certificate furnished by Acquiror pursuant to
   this Agreement, contains or will contain at the Effective Time any untrue
   statement of a material fact, or omits or will omit at the Effective Time,
   to state any material fact necessary in order to make the statements
   contained herein or therein, in the light of the circumstances under which
   made, not misleading.

     SECTION 3.2 REPRESENTATIONS AND WARRANTIES OF HCIA. Except as disclosed in
the Disclosure Schedule delivered by HCIA to Acquiror on August 11, 1999 in
accordance with the Original Merger Agreement (the "HCIA Disclosure Schedule"),
HCIA represents and warrants to Acquiror as follows as of August 11, 1999
(unless another date is specified, in which case as of such other date):

      (a) ORGANIZATION, STANDING AND CORPORATE POWER. Each of HCIA and its
   subsidiaries (as defined in Section 8.3) is a corporation or other legal
   entity duly organized, validly existing and in good standing under the laws
   of the jurisdiction in which it is organized and has the requisite
   corporate or other power, as the case may be, and authority to carry on its
   business as now being conducted, except, as to subsidiaries, for those
   jurisdictions where the failure to be so organized, existing or in good
   standing individually or in the aggregate would not have a material adverse
   effect on HCIA. Each of HCIA and its subsidiaries is duly qualified or
   licensed to do business and is in good standing in each jurisdiction in
   which the nature of its business or the ownership, leasing or operation of
   its properties makes such qualification or licensing necessary, except for
   those jurisdictions where the failure to be so qualified or licensed or to
   be in good standing individually or in the aggregate would not have a
   material adverse effect on HCIA. HCIA has delivered to Acquiror true,
   correct and complete copies of the minute books of HCIA and each of its
   subsidiaries.

      (b) SUBSIDIARIES. The HCIA Disclosure Schedule includes all the
   subsidiaries of HCIA. All the outstanding shares of capital stock of, or
   other equity interests in, each such subsidiary have been validly issued
   and are fully paid and nonassessable and are owned directly or indirectly
   by HCIA, free and clear of all Liens and free of any other restriction
   (including any restriction on the right to vote, sell or otherwise dispose
   of such capital stock or other ownership interests). Except as set forth in
   the HCIA Disclosure Schedule, HCIA does not own any equity interest in any
   person.

      (c) CAPITAL STRUCTURE. The authorized capital stock of HCIA consists of
   50,000,000 shares of HCIA Common Stock, and 500,000 shares of preferred
   stock, par value $.01 per share ("HCIA Preferred Stock"). As of August 11,
   1999: (i) 11,851,125 shares of HCIA Common Stock were issued and
   outstanding; (ii) no shares of HCIA Common Stock were held by HCIA in its
   treasury; (iii) no shares of HCIA Preferred Stock were issued and
   outstanding; (iv) 2,927,038 shares of HCIA Common Stock were reserved for
   issuance pursuant to all stock option, restricted stock or other
   stock-based compensation, benefits or savings plans, agreements or
   arrangements in which current or former employees, consultants or directors
   of HCIA or its subsidiaries participate as of the date hereof, complete and
   correct copies of which, in each case as amended as of the date hereof,
   have been made available to Acquiror (such plans, collectively, the "HCIA
   Stock Plans"); and (v) 118,511.25 shares of HCIA Preferred Stock designated
   as Series A Junior Participating Preferred Stock were reserved for issuance
   upon the exercise of preferred stock purchase rights (the "HCIA Rights")
   issued pursuant to the Stockholders Rights Agreement, dated as of April 23,
   1997, between HCIA and Chase Mellon Shareholder Services, L.L.C., as rights
   agent (the "HCIA Rights Agreement"). The HCIA Disclosure Schedule sets
   forth a complete and correct list, as of August 11, 1999, of the number of
   shares of HCIA Common Stock subject to HCIA Stock Options, including,
   without limitation, the number of employee stock options or other rights to
   purchase or receive HCIA Common Stock granted under the HCIA Stock Plans
   (collectively, "HCIA Employee Stock Options"). All outstanding shares of
   capital stock of HCIA are, and all shares which may be issued pursuant to
   this Agreement or otherwise will be, when issued, duly authorized, validly
   issued, fully paid and nonassessable and not subject to preemptive rights.
   Except as set forth in this Section 3.2(c), and except for changes
   resulting from the issuance of shares of HCIA Common Stock pursuant to the
   exercise after August 11, 1999 of HCIA Employee Stock Options which were
   issued prior to August 11, 1999, (x) there are not issued, reserved for
   issuance or outstanding (A) any shares of capital stock or other voting
   securities of HCIA, (B) any securities of HCIA or any HCIA subsidiary
   convertible into or exchangeable or exercisable for shares of capital stock
   or voting securities of HCIA, (C) any warrants, calls, options or other
   rights to acquire from HCIA or any HCIA subsidiary, and any obligation of
   HCIA or any HCIA subsidiary to issue, any capital stock, voting securities
   or securities convertible into or exchangeable or exercisable for capital
   stock or voting securities of HCIA, and (y) there are no outstanding
   obligations of HCIA or any HCIA subsidiary to repurchase, redeem or
   otherwise acquire any such securities or to issue, deliver or sell, or
   cause to be issued, delivered or sold, any such securities. There are no
   outstanding (A) securities of HCIA or any HCIA subsidiary convertible into
   or exchangeable or exercisable for shares of capital stock or other voting
   securities or ownership interests in any HCIA subsidiary, (B) warrants,
   calls, options or other rights to acquire from HCIA or any HCIA subsidiary,
   or obligations of


                                      6
<PAGE>

   HCIA or any HCIA subsidiary to issue, any capital stock, voting securities
   or other ownership interests in, or any securities convertible into or
   exchangeable or exercisable for any capital stock, voting securities or
   ownership interests in, any HCIA subsidiary or (C) obligations of HCIA or
   any HCIA subsidiary to repurchase, redeem or otherwise acquire any such
   outstanding securities of HCIA subsidiaries or to issue, deliver or sell,
   or cause to be issued, delivered or sold, any such securities. Neither HCIA
   nor any HCIA subsidiary is a party to any agreement restricting the
   purchase or transfer of, relating to the voting of, requiring registration
   of, or granting any preemptive or, except as provided by the terms of the
   HCIA Employee Stock Options, antidilutive rights with respect to, any
   securities of the type referred to in the two preceding sentences. Other
   than as set forth on the HCIA Disclosure Schedule, all outstanding shares
   of capital stock of the subsidiaries of HCIA are owned free and clear of
   all Liens, and HCIA does not directly or indirectly beneficially own any
   securities or other beneficial ownership interests in any other entity.

      (d) AUTHORITY; NONCONTRAVENTION. HCIA has all requisite corporate power
   and authority to enter into this Agreement and, subject to the HCIA
   Stockholder Approval (as defined in Section 3.2(l)), to consummate the
   transactions contemplated hereby. The execution and delivery of this
   Agreement by HCIA and the consummation by HCIA of the transactions
   contemplated hereby have been duly authorized by all necessary corporate
   action on the part of HCIA, subject, in the case of the Merger, to the HCIA
   Stockholder Approval. This Agreement has been duly executed and delivered
   by HCIA and, assuming the due authorization, execution and delivery thereof
   by Acquiror, constitutes the legal, valid and binding obligation of HCIA,
   enforceable against HCIA in accordance with its terms. The execution and
   delivery of this Agreement by HCIA does not, and the consummation of the
   transactions contemplated hereby and compliance with the provisions of this
   Agreement will not, conflict with, or result in any violation of, or
   default (with or without notice or lapse of time, or both) under, or give
   rise to a right of termination, cancellation or acceleration of any
   obligation or loss of a benefit under, or result in the creation of any
   Lien upon any of the properties or assets of HCIA or any of its
   subsidiaries or any restriction on the conduct of HCIA's, or any of its
   subsidiaries' business or operations under, (i) the articles of
   incorporation of HCIA, as amended (the "HCIA Articles"), or bylaws or the
   comparable organizational documents of any of its subsidiaries, (ii) except
   for such conflicts, violations or defaults, or rights of termination,
   cancellation or acceleration that may arise solely as a result of the
   merger of HCIA with and into the LLC, rather than the merger of the Merger
   Sub with and into HCIA, any loan or credit agreement, note, bond, mortgage,
   indenture, trust document, lease or other agreement, instrument, permit,
   concession, franchise, license or similar authorization applicable to HCIA
   or any of its subsidiaries or their respective properties or assets or
   (iii) subject to the governmental filings and other matters referred to in
   the following sentence, any judgment, order, decree, statute, law,
   ordinance, rule or regulation applicable to HCIA or any of its subsidiaries
   or their respective properties or assets, other than, in the case of
   clauses (ii) and (iii), any such conflicts, violations, defaults, rights,
   losses, restrictions or Liens that individually or in the aggregate would
   not (x) have a material adverse effect on HCIA or any of its subsidiaries
   or (y) reasonably be expected to impair the ability of HCIA to perform its
   obligations under this Agreement. No consent, approval, order or
   authorization of, action by, or in respect of, or registration, declaration
   or filing with, any Governmental Entity is required by or with respect to
   HCIA or any of its subsidiaries in connection with the execution and
   delivery of this Agreement by HCIA or the consummation by HCIA of the
   transactions contemplated hereby, except for (1) the filing of a pre-merger
   notification and report form by HCIA under the HSR Act or filings or
   notifications under the antitrust, competition or similar laws of any
   foreign jurisdiction; (2) the filing with the SEC of (A) the Proxy
   Statement relating to the HCIA Stockholders' Meeting, and (B) such reports
   under Sections 13(a), 13(d), 15(d) or 16(a) of the Exchange Act as may be
   required in connection with this Agreement and the transactions
   contemplated hereby; (3) the filing of the Certificates of Merger with the
   Maryland State Department of Assessments and Taxation and the Secretary of
   State of the State of Delaware and appropriate documents with the relevant
   authorities of other states in which HCIA is qualified to do business and
   such filings with Governmental Entities as may be necessary to satisfy the
   applicable requirements of state securities or "blue sky" laws; and (4)
   such consents, approvals, orders or authorizations the failure of which to
   be made or obtained individually or in the aggregate would not (x) have a
   material adverse effect on HCIA or any of its subsidiaries or (y)
   reasonably be expected to impair the ability of HCIA to perform its
   obligations under this Agreement. The HCIA Disclosure Schedule sets forth a
   list of all third party consents and approvals required to be obtained by
   HCIA in connection with this Agreement under the Material Contracts prior
   to the consummation of the transactions contemplated by this Agreement,
   except for such consents and approvals that may be required solely as a
   result of the merger of HCIA with and into the LLC, rather than the merger
   of the Merger Sub with and into HCIA.

      (e) SEC DOCUMENTS; UNDISCLOSED LIABILITIES. HCIA has filed all required
   registration statements, prospectuses, reports, schedules, forms,
   statements and other documents (including exhibits and all other
   information incorporated therein) with the SEC since December 31, 1996 (as
   such documents have been amended since the time of their filing


                                      7
<PAGE>

   collectively the "HCIA SEC Documents"). As of their respective dates, the
   HCIA SEC Documents complied in all material respects with the requirements
   of the Securities Act of 1933, as amended ("the Securities Act"), or the
   Exchange Act, as the case may be, and the rules and regulations of the SEC
   promulgated thereunder applicable to such HCIA SEC Documents, and none of
   the HCIA SEC Documents when filed contained any untrue statement of a
   material fact or omitted to state a material fact required to be stated
   therein or necessary in order to make the statements therein, in light of
   the circumstances under which they were made, not misleading. None of
   HCIA's subsidiaries is required to file any forms, reports or other
   documents with the SEC. The consolidated financial statements of HCIA and
   its subsidiaries included in the HCIA SEC Documents have been prepared from
   and are in accordance with the books and records of HCIA and its
   consolidated subsidiaries, comply as to form, as of their respective dates
   of filing with the SEC, in all respects with applicable accounting
   requirements and the published rules and regulations of the SEC with
   respect thereto, have been prepared in accordance with GAAP applied on a
   consistent basis during the periods involved (except as may be indicated in
   the notes thereto) and fairly present the consolidated financial position
   of HCIA and its consolidated subsidiaries as of the dates thereof and the
   consolidated results of their operations and cash flows for the periods
   then ended (subject, in the case of unaudited statements, to normal
   year-end audit adjustments which are not material). Except (i) as reflected
   in such financial statements or in the notes thereto or (ii) for
   liabilities incurred in connection with this Agreement or the transactions
   contemplated hereby, neither HCIA nor any of its subsidiaries has any
   liabilities or obligations of any nature which, individually or in the
   aggregate, would have a material adverse effect on HCIA.

      (f) INFORMATION SUPPLIED. None of the information supplied or to be
   supplied by HCIA specifically for inclusion or incorporation by reference
   in the Proxy Statement will, at the date it is first mailed to HCIA's
   stockholders or at the time of the HCIA Stockholders' Meeting, contain any
   untrue statement of a material fact or omit to state any material fact
   required to be stated therein or necessary in order to make the statements
   therein, in light of the circumstances under which they are made, not
   misleading. The Proxy Statement will comply as to form in all respects with
   the requirements of the Exchange Act and the rules and regulations
   thereunder, except that no representation or warranty is made by HCIA with
   respect to statements made or incorporated by reference therein based on
   information supplied by Acquiror specifically for inclusion or
   incorporation by reference in the Proxy Statement.

      (g) ABSENCE OF CERTAIN CHANGES OR EVENTS. Except for liabilities incurred
   in connection with this Agreement or the transactions contemplated hereby,
   and except as permitted by Section 4.1(a), since December 31, 1998, HCIA
   and its subsidiaries have conducted their business only in the ordinary
   course consistent with past practice and there has not been (i) any
   declaration, setting aside or payment of any dividend or other distribution
   (whether in cash, stock or property) with respect to any of HCIA's capital
   stock or any redemption or other acquisition by HCIA of any shares of its
   capital stock, (ii) any split, combination or reclassification of any of
   HCIA's capital stock or any issuance or the authorization of any issuance
   of any other securities in respect of, in lieu of or in substitution for
   shares of HCIA's capital stock, except for issuances of HCIA Common Stock
   upon exercise or conversion of HCIA Employee Stock Options, in each case
   awarded prior to the date hereof in accordance with their present terms,
   (iii) except as set forth in the HCIA Disclosure Schedule, (A) any granting
   by HCIA or any of its subsidiaries to any current or former director,
   officer, consultant or other key employee of HCIA or its subsidiaries of
   any increase in compensation, bonus, insurance or other benefits, except
   for normal increases as a result of promotions, normal increases of base
   pay or target bonuses in the ordinary course of business or as was required
   under any employment agreements in effect as of December 31, 1998, (B) any
   granting by HCIA or any of its subsidiaries to any such current or former
   director, officer, consultant or employee of any increase in severance or
   termination pay, or (C) any entry by HCIA or any of its subsidiaries into,
   or any amendment of, any employment, deferred compensation, consulting
   (other than those for annual compensation of $100,000 or less), severance,
   termination or indemnification agreement with any such current or former
   director, officer, consultant or key employee, (iv) except insofar as may
   have been required by a change in GAAP, any change in accounting methods,
   principles or practices by HCIA materially affecting its assets,
   liabilities or business, (v) any tax election that individually or in the
   aggregate would have a material adverse effect on HCIA or any of its tax
   attributes or any settlement or compromise of any material income tax
   liability, (vi) any entry into or any amendment to any agreement,
   commitment or transaction by HCIA or any subsidiary thereof which is
   material to HCIA or any subsidiary thereof other than agreements entered
   into in the ordinary course of business with person or entities not
   affiliated with HCIA or (vii) any action taken by HCIA or any of the HCIA
   subsidiaries during the period from January 1, 1999 through August 11, 1999
   that, if taken during the period from August 11, 1999 through the Effective
   Time, would constitute a breach of Section 4.1(a). From August 11, 1999
   through the date of this Agreement, neither HCIA nor any of its
   subsidiaries, nor the Board of Directors of HCIA nor any committee thereof
   has taken or permitted any action that, if taken or permitted during the
   period from August 11, 1999 through the Effective Time, would constitute a
   breach of Section 4.2.


                                      8
<PAGE>

      (h) COMPLIANCE WITH APPLICABLE LAWS; LITIGATION.

         (i) HCIA, its subsidiaries and employees hold all permits, licenses,
      variances, exemptions, orders, registrations and approvals of all
      Governmental Entities which are required for the operation of the
      businesses of HCIA and its subsidiaries (the "HCIA Permits") except where
      the failure to have any such HCIA Permits individually or in the
      aggregate would not have a material adverse effect on HCIA.

         (ii) Except as specifically disclosed in the HCIA Disclosure Schedule,
      HCIA and its subsidiaries are in compliance with the terms of the HCIA
      Permits and all applicable local, state, federal and foreign laws, rules,
      regulations, and ordinances (collectively "Applicable Laws") relating to
      HCIA and its subsidiaries or their businesses or properties, except where
      the failure to be in compliance with such Applicable Laws individually or
      in the aggregate would not have a material adverse effect on HCIA or any
      of its subsidiaries. As of August 11, 1999, except as disclosed in the
      HCIA Disclosure Schedule, no action, demand, requirement or investigation
      by any Governmental Entity and no suit, action or proceeding by any
      person, in each case with respect to HCIA or any of its subsidiaries or
      any of their respective properties, is pending or, to the best knowledge
      of HCIA, threatened, other than, in each case, those the outcome of which
      individually or in the aggregate would not (A) have a material adverse
      effect on HCIA or (B) reasonably be expected to impair the ability of
      HCIA to perform its obligations under this Agreement or prevent or delay
      the consummation of any of the transactions contemplated hereby.

         (iii) Neither HCIA nor any HCIA subsidiary is subject to any
      outstanding order, injunction, judgment or decree which has had or,
      insofar as can be reasonably foreseen, individually or in the aggregate
      will have, a material adverse effect on HCIA.

      (i) ABSENCE OF CHANGES IN BENEFIT PLANS. The HCIA Disclosure Schedule
   lists the following employee benefit plans sponsored or maintained by HCIA
   and or its subsidiaries: (1) pension, profit sharing, deferred
   compensation, incentive compensation (other than agreements with 50
   salespersons entered into in the ordinary course of business, copies of
   which have been provided to Acquiror), bonus, stock option, stock purchase,
   phantom stock, vacation, severance, disability, medical, hospitalization,
   dental, life insurance or other plans, arrangements or understandings
   providing pension, welfare or incentive compensation benefits, or (2)
   employment agreements, consulting agreements, management retention and
   severance agreements with any current or former officers, key employees,
   consultants or directors of HCIA or any subsidiary thereof (collectively,
   the "HCIA Benefit Plans"). HCIA has delivered to Acquiror or provided to
   Acquiror for review true and complete copies of (i) plan documents (as
   applicable) and summary plan descriptions with respect to all "employee
   welfare benefit plans" and "employee pension benefit plans" (within the
   meaning of Sections 3(1) or 3(2) of the Employee Retirement Income Security
   Act of 1974, as amended ("ERISA")) sponsored or maintained by HCIA or its
   subsidiaries ("ERISA Plans"), (ii) plan documents or summary descriptions
   of all bonus or incentive compensation plans, programs and arrangements for
   employees of HCIA and/or its subsidiaries including, without limitation,
   stock option and stock purchase plans, (iii) all severance and employment
   agreements of HCIA with directors, consultants, officers or employees, (iv)
   all written and unwritten severance programs and policies of each of HCIA
   and each HCIA subsidiary, and (v) all plans or arrangements of HCIA and
   each HCIA subsidiary relating to its employees which contain change in
   control provisions. HCIA has or will deliver to Acquiror true and complete
   copies of the IRS Form 5500 filed in the most recent plan year with respect
   to any ERISA Plan, including, as applicable, all schedules thereto and
   financial statements with attached opinions of independent auditors. Except
   as set forth in the HCIA Disclosure Schedule, since December 31, 1998,
   there has not been any adoption or amendment in any respect by HCIA or any
   of its subsidiaries of any HCIA Benefit Plan, or any change in the manner
   in which contributions to any HCIA deferred compensation plan is made or
   the basis on which such contributions are determined. Since December 31,
   1998, neither HCIA nor any HCIA subsidiary has amended any stock option or
   stock bonus plan to accelerate the vesting of, or release restrictions on,
   awards thereunder, or to provide for such acceleration in the event of a
   change in control.

      (j) BENEFIT PLANS.

         (i) The HCIA Benefit Plans have been operated, and are, in substantial
      compliance with the applicable provisions of ERISA, the Internal Revenue
      Code of 1986, as amended (the "Code") and all other Applicable Laws and
      the terms of such benefit plans, except for any failures to be in such
      compliance that individually or in the aggregate would not have a
      material adverse effect on HCIA. Each HCIA Benefit Plan that is intended
      to be qualified under Section 401(a) or 401(k) of the Code has received a
      favorable determination letter from the IRS that it is so qualified and
      each trust established in connection with any HCIA Benefit Plan that is
      intended to be exempt from federal income taxation under Section 501(a)
      of the Code has received a determination letter from


                                      9
<PAGE>

      the IRS that such trust is so exempt. To the best knowledge of HCIA, no
      fact or event has occurred since the date of any determination letter
      from the IRS which is reasonably likely to affect adversely the qualified
      status of any such HCIA Benefit Plan or the exempt status of any such
      trust.

         (ii) No HCIA Benefit Plan is subject to Title IV of ERISA or is a
      "multi-employer plan" within the meaning of Section 3(37) of ERISA, and
      neither HCIA nor any other organization which is a member of a
      "controlled group" of organizations (within the meaning of Sections
      414(b), (c), (m) or (o) of the Code) of which HCIA is a member, has ever
      maintained, or been obligated to contribute to, a plan subject to Title
      IV of ERISA or a multi-employer plan.

         (iii) No HCIA Benefit Plan provides medical benefits (whether or not
      insured), with respect to current or former employees after retirement or
      other termination of service (other than coverage mandated by applicable
      law or benefits, the full cost of which is borne by the current or former
      employee) other than individual arrangements the amounts of which are not
      material.

         (iv) Neither HCIA nor any of its subsidiaries is a party to any
      collective bargaining agreement or other labor union contract. As of
      August 11, 1999, there is no labor dispute, strike or work stoppage
      against HCIA or any of its subsidiaries pending or, to the best knowledge
      of HCIA, threatened which may interfere with the respective business
      activities of HCIA or any of its subsidiaries. As of August 11, 1999,
      none of HCIA, any of its subsidiaries or any of their respective
      representatives or employees has committed any unfair labor practice in
      connection with the operation of the respective businesses of HCIA or any
      of its subsidiaries, and there is no charge or complaint against HCIA or
      any of its subsidiaries by the National Labor Relations Board or any
      comparable governmental agency pending or, to the best knowledge of HCIA,
      threatened against HCIA or any of its subsidiaries.

         (v) Except as set forth in the HCIA Disclosure Schedule, no employee
      of HCIA will be entitled to any payment (whether severance pay or
      otherwise), additional benefits or any acceleration of the time of
      payment or vesting of any benefits under any HCIA Benefit Plan as a
      result of the transactions contemplated by this Agreement (either alone
      or in conjunction with any other event such as a termination of
      employment).

         (vi) There are no material unresolved claims or disputes under the
      terms of, or in connection with, any HCIA Benefit Plan (other than
      routine undisputed claims for benefits), and no action, legal or
      otherwise, has been commenced with respect to any material claim.

         (vii) To the best knowledge of HCIA, no non-exempt "prohibited
      transaction" (within the meaning of Section 4975(c) of the Code)
      involving any HCIA Benefit Plan has occurred that could subject HCIA to
      any tax penalty or other cost or liability (by indemnification or
      otherwise). All contributions required to be made under the terms of any
      HCIA Benefit Plan have been timely made.

      (k) TAXES.

         (i) Except as set forth in the HCIA Disclosure Schedule each of HCIA
      and its subsidiaries has filed all federal, state, foreign, local,
      income, sales and other tax returns and reports required to be filed by
      it (taking into account applicable extensions) and all such returns and
      reports are complete and correct in all material respects, or requests
      for extensions to file such returns or reports have been timely filed,
      granted and have not expired. HCIA and each of its subsidiaries has paid
      (or HCIA has paid or caused to be paid on its behalf) all taxes shown as
      due on such returns, and the most recent financial statements contained
      in the HCIA SEC Documents reflect an adequate reserve in accordance with
      GAAP for all taxes payable by HCIA and its subsidiaries for all taxable
      periods and portions thereof accrued through the date of such financial
      statements.

         (ii) No deficiencies for any taxes have, to the best knowledge of
      HCIA, been proposed, asserted or assessed against HCIA or any of its
      subsidiaries that are not adequately reserved for, except for
      deficiencies that individually or in the aggregate would not have a
      material adverse effect on HCIA. Except as provided in the HCIA
      Disclosure Schedule, all of the federal income tax returns of the
      affiliated group of which HCIA is the common parent have closed by virtue
      of the applicable statute of limitations.

         (iii) Except as set forth in the HCIA Disclosure Schedule, neither
      HCIA nor any HCIA subsidiary has made any parachute payments as such term
      is defined in Section 280G of the Code, neither is obligated to make any
      parachute payments, and neither is a party to any agreement that under
      certain circumstances could obligate it, or any successor in interest, to
      make any parachute payments that will not be deductible under Section
      280G of the


                                      10
<PAGE>

      Code. Neither HCIA nor any HCIA subsidiary is obligated to make
      reimbursement or gross-up payments to any person in respect to excess
      parachute payments.

         (iv) No federal, state, local or foreign audits, examinations or other
      administrative proceedings have been commenced or, to the best knowledge
      of HCIA, are pending with regard to any taxes or tax returns of HCIA or
      of any of its subsidiaries. No written notification has been received by
      HCIA or by any of its subsidiaries that such an audit, examination or
      other proceeding is pending or threatened with respect to any taxes due
      from or with respect to or attributable to HCIA or any of its
      subsidiaries or any tax return filed by or with respect to HCIA or any of
      its subsidiaries. To the best of HCIA's knowledge, there is no dispute or
      claim concerning any tax liability of HCIA or any of its subsidiaries
      either claimed or raised by any United States or foreign taxing authority
      in writing.

         (v) During their most recent five taxable years, respectively, neither
      HCIA nor any of its subsidiaries has made a change in tax accounting
      methods, received a ruling from any taxing authority or signed an
      agreement with any taxing authority which has or would be reasonably
      likely to have a material adverse effect on HCIA or any of its
      subsidiaries. Neither HCIA nor any of its subsidiaries is required to
      include in income any adjustment pursuant to Section 481(a) of the Code
      or any similar provision of foreign, state or local law, by reason of a
      voluntary change in tax accounting method (nor has any taxing authority
      proposed in writing any such adjustment or change of accounting method).

         (vi) Neither HCIA nor any of its subsidiaries is a party to, is bound
      by or has any obligation under any tax sharing agreement, tax
      indemnification agreement or similar contract or arrangement. Neither
      HCIA nor any of its subsidiaries is aware of any potential liability or
      obligation to any person as a result of, or pursuant to, any such
      agreement, contract or arrangement. Neither HCIA nor any of its
      subsidiaries has any liability for taxes of another person by contract or
      otherwise.

      (l) VOTING REQUIREMENTS. The affirmative vote at the HCIA Stockholders'
   Meeting (the "HCIA Stockholder Approval") of the holders of a majority of
   all outstanding shares of HCIA Common Stock entitled to vote at a duly
   convened and held meeting of HCIA stockholders is the only vote of the
   holders of any class or series of HCIA's capital stock necessary to approve
   and adopt this Agreement and the transactions contemplated hereby,
   including the Merger.

      (m) STATE TAKEOVER STATUTES. On August 11, 1999, the Board of Directors
   of HCIA adopted a resolution or resolutions approving this Agreement and
   the transactions contemplated hereby and, assuming the accuracy of
   Acquiror's representation and warranty contained in Section 3.1(e), such
   approval constitutes approval of the Merger and the other transactions
   contemplated hereby by the HCIA Board of Directors under the provisions of
   Sections 3-602 and 3-701 ET SEQ. of the MGCL such that Sections 3-602 and
   3-701 ET SEQ. of the MGCL do not apply to this Agreement or the
   transactions contemplated hereby. No state takeover statute other than
   Sections 3-602 and 3-701 ET SEQ. of the MGCL (which have been rendered
   inapplicable) is applicable to the Merger or the other transactions
   contemplated hereby.

      (n) BROKERS. Except as set forth in the HCIA Disclosure Schedule, no
   broker, investment banker, financial advisor or other person is entitled to
   any broker's, finder's, financial advisor's or other similar fee or
   commission in connection with the transactions contemplated by this
   Agreement based upon arrangements made by or on behalf of HCIA.

      (o) OPINION OF FINANCIAL ADVISOR. The Board of Directors of HCIA has
   received the opinion of Deutsche Bank Securities Inc., dated August 11,
   1999, to the effect that, as of such date, the Merger Consideration is fair
   from a financial point of view to the holders of HCIA Common Stock, a
   signed copy of which opinion has been delivered to Acquiror.

      (p) OWNERSHIP OF ACQUIROR EQUITY INTERESTS. To the best knowledge of
   HCIA, as of August 11, 1999 or at any time within twelve months prior to
   August 11, 1999 neither HCIA nor, to its knowledge without independent
   investigation, any of its affiliates, (i) beneficially owns (as defined in
   Rule 13d-3 under the Exchange Act) or owned, directly or indirectly, or
   (ii) is or was party to any agreement, arrangement or understanding for the
   purpose of acquiring, holding, voting or disposing of, in each case, equity
   interests of Acquiror.

      (q) INTELLECTUAL PROPERTY.

         (i) HCIA or its subsidiaries own or have a valid right to use all of
      the trademarks, copyrights, service marks, trade names, Internet domain
      names, designs, slogans, and general intangibles of like nature, together
      with all applications, registrations and goodwill related to the
      foregoing (collectively, "Trademarks"); patents; Software (as


                                      11
<PAGE>

      defined below); confidential information, know-how, proprietary
      processes, formulae, algorithms, models, methodologies and other trade
      secrets (collectively, "Trade Secrets") used in or necessary for the
      conduct of HCIA's and each of its subsidiary's business as currently
      conducted, except where the failure to possess such right would not have
      a material adverse effect on HCIA's and its subsidiaries' business as
      currently conducted considered as a whole (all such intellectual property
      being referred to herein as the "Intellectual Property"). For purposes of
      this Section 3.2(q), "Software" means any and all (a) computer programs,
      including any and all software implementations of algorithms, models and
      methodologies, whether in source code or object code, (b) databases and
      compilations, including any and all data and collections of data, whether
      machine readable or otherwise, (c) descriptions, flowcharts and other
      work product used to design, plan, organize and develop any of the
      foregoing, (d) the technology supporting any Internet site(s) operated by
      or on behalf of HCIA or any of its subsidiaries and (e) all
      documentation, including user manuals and training materials, relating to
      any of the foregoing.

         (ii) HCIA and its subsidiaries own or have a valid right to use all
      items of Intellectual Property set forth in the HCIA Disclosure Schedule
      and own or have the right to use all items of Intellectual Property
      necessary to provide, produce, sell and license the services and products
      currently provided, produced, sold and licensed by HCIA and its
      subsidiaries and to conduct the business of HCIA and its subsidiaries as
      presently conducted or as currently proposed to be conducted. The
      Intellectual Property owned by HCIA or any subsidiary is free and clear
      of all Liens.

         (iii) The Intellectual Property owned by HCIA or any of its
      subsidiaries and, to HCIA's best knowledge, any Intellectual Property
      used by HCIA, is valid and subsisting, in full force and effect, and has
      not been rescinded, canceled, expired, or abandoned. There is no pending
      or, to HCIA's best knowledge, threatened opposition, interference or
      cancellation proceeding before any court or registration authority in any
      jurisdiction against any registrations in respect of the Intellectual
      Property owned by HCIA or any of its subsidiaries, or, to HCIA's best
      knowledge, against any Intellectual Property licensed to HCIA or any of
      its subsidiaries.

         (iv) To the best knowledge of HCIA or any of its subsidiaries, the
      conduct of the business of HCIA and its subsidiaries as currently
      conducted does not infringe upon (either directly or indirectly such as
      through contributory infringement or inducement to infringe) any patent,
      copyright, trademark, service mark, trade secret or other intellectual
      property rights owned or controlled by any third party. There are no
      claims or suits pending or, to the best knowledge of HCIA, threatened,
      and neither HCIA nor any of its subsidiaries has received any notice of a
      third-party claim or suit, (a) alleging that its activities or the
      conduct of its business infringes upon, violates, or constitutes the
      unauthorized use of the intellectual property rights of any third party
      or (b) challenging the ownership, use, validity or enforceability of any
      Intellectual Property.

         (v) There are no settlements, forbearances to sue, consents,
      judgments, or orders or similar obligations which in any respect (a)
      restrict the right of HCIA or its subsidiaries to use any Intellectual
      Property, or (b) restrict the business of HCIA or its subsidiaries in
      order to accommodate a third party's intellectual property rights.

         (vi) All of HCIA's and its subsidiaries' patents, trademarks and
      copyrights issued by, registered with or filed with the United States
      Patent and Trademark Office or Register of Copyrights or the
      corresponding offices or governmental agencies of other countries have
      been so duly registered, filed in or issued, as the case may be, have
      been properly maintained and renewed in accordance with all applicable
      provisions of law and administrative regulations, and HCIA and its
      subsidiaries, as the case may be, are the record owners thereof. There
      have been no acts or omissions by HCIA or its subsidiaries, the result of
      which would be to compromise the rights of HCIA or its subsidiaries to
      apply for or enforce appropriate legal protection of such Intellectual
      Property.

         (vii) HCIA and each of its subsidiaries have adopted reasonable
      measures in accordance with normal industry practice to protect the
      confidentiality of Trade Secrets and other confidential Intellectual
      Property, including (a) requiring all of its employees, officers, agents,
      consultants, directors and independent contractors having access thereto
      to execute written nondisclosure agreements and (b) requiring all
      licensees to maintain the confidentiality of its Trade Secrets. To the
      best knowledge of HCIA or its subsidiaries, no Trade Secret has been
      knowingly disclosed or authorized to be disclosed to any third party
      other than pursuant to a nondisclosure agreement or other appropriate
      instrument that adequately protects HCIA and the applicable subsidiary's
      proprietary interests in and to such Trade Secrets. To the best knowledge
      of HCIA, no party to any nondisclosure agreement or nondisclosure
      obligation relating to its Trade Secrets is in breach or default thereof.
      No former employees, officers, agents, consultants, directors or
      independent contractors of HCIA or any of its subsidiaries have asserted
      any claim, or have


                                      12
<PAGE>

      any, valid claim or valid right to any of HCIA's or any of its
      subsidiaries' Intellectual Property used in or necessary for the conduct
      of HCIA's or its subsidiaries' business as now conducted or as currently
      proposed to be conducted. To HCIA's best knowledge, no employee, officer,
      agent, independent contractor, consultant or director of HCIA or any of
      its subsidiaries is a party to or otherwise bound by any agreement with
      any other person (including, any former employer) which conflicts with
      any obligation or commitment of such employee to HCIA or any of its
      subsidiaries under any agreement to which he or she is a party.

         (viii) To the best knowledge of HCIA, no third party is
      misappropriating, infringing, diluting, or violating any Intellectual
      Property owned by HCIA or any of its subsidiaries.

         (ix) The consummation of the transactions contemplated hereby shall
      not result in the loss or impairment of HCIA's or of any subsidiary's
      right to own or use any of the Intellectual Property, and will not
      require the consent of any governmental authority.

         (x) The computer systems of HCIA and its subsidiaries (including all
      Software, hardware, workstations and related components, automated
      devices, embedded chips and other date sensitive equipment) are Year 2000
      Compliant or will be Year 2000 Compliant by December 31, 1999. "Year 2000
      Compliant" means that the computer systems: (i) are capable of
      recognizing, processing, managing, representing, interpreting and
      manipulating correctly date-related data for dates earlier and later than
      January 1, 2000, including calculating, comparing, sorting, storing,
      tagging and sequencing, without resulting in or causing logical or
      mathematical errors or inconsistencies in any user-interface
      functionalities or otherwise, including data input and retrieval, data
      storage, data fields, calculations, reports, processing or any other
      input or output; (ii) have the ability to provide date recognition for
      any data element without limitation (including date-related data
      represented without a century designation, date-related data whose year
      is represented by only two digits and date fields assigned special
      values); (iii) have the ability to function automatically into and beyond
      the year 2000 without human intervention and without any change in
      operations associated with the advent of the year 2000; (iv) have the
      ability to interpret data, dates and time correctly into and beyond the
      year 2000; (v) have the ability not to produce noncompliance in existing
      information, nor otherwise corrupt such data into and beyond the year
      2000; (vi) have the ability to process correctly after January 1, 2000
      data containing dates before that date; and (vii) have the ability to
      recognize all "leap years," including February 29, 2000.

      (r) CERTAIN CONTRACTS. The HCIA Disclosure Schedule sets forth a complete
   and correct list as of August 11, 1999 of the following types of agreements
   to which HCIA or any subsidiary thereof is a party to or bound by: (i) any
   non-competition agreement or any other agreement or obligation which
   purports to limit in any material respect the manner in which, or the
   localities in which, all or any material portion of the business of HCIA
   and its subsidiaries (including, for purposes of this Section 3.2(r),
   Acquiror and its subsidiaries, assuming the Merger has taken place), taken
   as a whole, is or would be conducted; (ii) exclusive supply or purchase
   contracts or any exclusive requirements contracts; (iii) agreements filed
   as an exhibit to the HCIA SEC Documents and each agreement that would have
   been required to be filed as an exhibit to the HCIA SEC Documents had such
   agreement been entered into as of the date of filing of any such HCIA SEC
   Document; (iv) employment, severance, termination, consulting (other than
   those for annual compensation of $50,000 or less) and retirement
   agreements; (v) loan agreements, indentures, letters of credit, mortgages,
   notes and other debt instruments evidencing indebtedness in excess of
   $50,000; (vi) agreements that require aggregate future payments to or by
   HCIA or any subsidiary thereof of more than $100,000 per annum (other than
   purchase orders and other transactions entered into in the ordinary course
   of business consistent with past practice with a term not exceeding one
   year); (vii) agreements containing any "change of control" provisions
   which, if triggered, would involve payments by HCIA or any subsidiary in
   excess of $50,000 or other material rights or obligations; (viii) material
   agreements with any key employee, director, officer, or person known to
   HCIA to be a direct or indirect stockholder of HCIA; (ix) joint venture,
   partnership and similar agreements involving a sharing of profits; (x)
   acquisition or divestiture agreements relating to (A) the sale of assets or
   stock of HCIA or any subsidiary or (B) the purchase of assets or stock of
   any other person, specifying any earn-out or other payments required to be
   made after the date hereof; (xi) brokerage, finder's or financial advisory
   agreements; (xii) guarantees of indebtedness for borrowed money of any
   person; or (xiii) contracts or other agreements which would prohibit or
   delay the consummation of the Merger or any of the transactions
   contemplated by this Agreement, other than solely as a result of the merger
   of HCIA with and into the LLC, rather than the merger of the Merger Sub
   with and into HCIA (all contracts of the type described in the foregoing
   clauses being collectively referred to herein as "Material Contracts").
   HCIA has delivered to Acquiror or made available to Acquiror for review,
   prior to the execution of this Agreement, complete and correct copies of
   all Material Contracts. Each Material Contract constitutes the legal, valid
   and binding obligation of HCIA enforceable against HCIA


                                      13
<PAGE>

   in accordance with its terms (or, to the extent a HCIA subsidiary is a
   party, such subsidiary) and is in full force and effect, and HCIA and each
   HCIA subsidiary have in all respects performed all obligations required to
   be performed by them to date under each Material Contract, except where
   such noncompliance, individually or in the aggregate, would not have a
   material adverse effect on HCIA or any of its subsidiaries. Except for such
   violations or defaults that may arise solely as a result of the merger of
   HCIA with and into the LLC, rather than the merger of the Merger Sub with
   and into HCIA, neither HCIA nor any HCIA subsidiary knows of, or has
   received notice of, any violation or default under (nor, to the best
   knowledge of HCIA, does there exist any condition which with the passage of
   time or the giving of notice or both would result in such a violation or
   default under) any Material Contract.

      (s) HCIA RIGHTS AGREEMENT. HCIA has taken all action (including, if
   required, redeeming all of the outstanding preferred stock purchase rights
   issued pursuant to the HCIA Rights Agreement or amending or terminating the
   HCIA Rights Agreement) so that the entering into of this Agreement and the
   consummation of the transactions contemplated hereby do not and will not
   result in the grant of any rights to any person under the HCIA Rights
   Agreement or enable or require the HCIA Rights to be exercised, distributed
   or triggered.

      (t) ENVIRONMENTAL LIABILITY. Except as set forth in the HCIA Disclosure
   Schedule and except for matters which, individually or in the aggregate,
   would not have or be reasonably likely to have a material adverse effect on
   HCIA or any of its subsidiaries, (i) HCIA and each subsidiary is in
   compliance with all applicable Environmental Laws (as defined below); (ii)
   all permits and other governmental authorizations currently held by HCIA
   and each subsidiary pursuant to the Environmental Laws are in full force
   and effect, HCIA and each subsidiary is in compliance with all of the terms
   of such permits and authorizations, and no other permits or authorizations
   are required by HCIA or any subsidiary for the conduct of their respective
   businesses; and (iii) the management, handling, storage, transportation,
   treatment, and disposal by HCIA and each subsidiary of any Hazardous
   Materials (as defined below) has been in compliance with all applicable
   Environmental Laws. Neither HCIA nor any subsidiary has received any
   written communication that alleges that HCIA or any subsidiary is not in
   compliance in all material respects with all applicable Environmental Laws.
   Except as set forth in the HCIA Disclosure Schedule, there are no legal,
   administrative, arbitral or other proceedings, claims, actions, causes of
   action, private environmental investigations or remediation activities or
   governmental investigations of any nature pending or, to the best knowledge
   of HCIA, threatened against HCIA or any of its subsidiaries seeking to
   impose, or that could reasonably be expected to result in the imposition,
   on HCIA or any of its subsidiaries, of any liability or obligation arising
   under common law or under any local, state or federal environmental
   statute, regulation or ordinance, including, without limitation, the
   Comprehensive Environmental Response Compensation and Liability Act of
   1980, as amended. To the best knowledge of HCIA, there is no reasonable
   basis for any such proceeding, claim, action or governmental investigation
   that would impose any liability or obligation or any of its subsidiaries on
   HCIA. As used in this Agreement, these terms shall have the following
   meanings:

         (i) "Environmental Claim" means any and all administrative, regulatory
      or judicial actions, suits, demands, demand letters, directives, claims,
      Liens, investigations, proceedings or notices of noncompliance or
      violation (written or oral) by any person or governmental authority
      alleging potential liability against HCIA or any of its subsidiaries
      arising out of, based on or resulting from the presence, or release or
      threatened release into the environment, of any Hazardous Materials at
      any location owned or leased by HCIA or any subsidiary thereof or other
      circumstances forming the basis of any violation or alleged violation of
      any Environmental Law.

         (ii) "Environmental Laws" means all applicable foreign, federal, state
      and local laws (including the common law), rules, requirements and
      regulations relating to pollution, the environment (including, without
      limitation, ambient air, surface water, ground water, land surface or
      subsurface strata) or protection of human health as it relates to the
      environment including, without limitation, laws and regulations relating
      to releases of Hazardous Materials, or otherwise relating to the
      manufacture, processing, distribution, use, treatment, storage, disposal,
      transport or handling of Hazardous Materials or relating to management of
      asbestos in buildings.

         (iii) "Hazardous Materials" means wastes, substances or materials
      (whether solids, liquids or gases) that are deemed hazardous, toxic,
      pollutants or contaminants, including, without limitation, substances
      defined as "hazardous substances," "toxic substances," "radioactive
      materials," or other similar designations in, or otherwise subject to
      regulation under, any Environmental Laws.

      (u) INSURANCE. HCIA and each of its subsidiaries have policies of
   insurance of the type and in amounts customarily carried by persons
   conducting businesses or owning assets similar to those of HCIA and its
   subsidiaries. There is no material claim pending under any of such policies
   as to which coverage has been questioned, denied or disputed by the
   underwriters of such policies, except questioned, denied or disputed claims
   the failure to provide coverage for which


                                      14
<PAGE>

   would not, individually or in the aggregate, have a material adverse effect
   on HCIA. All premiums due and payable under all such policies have been
   paid and HCIA and its subsidiaries are otherwise in compliance in all
   material respects with the terms of such policies. HCIA has no knowledge of
   any threatened termination of, or material premium increase with respect
   to, any of such policies.

      (v) TRANSACTIONS WITH AFFILIATES. Except as disclosed in the HCIA
   Disclosure Schedule, since December 31, 1998, there have been no
   transactions, agreements, arrangements or understandings between HCIA and
   its affiliates that would be required to be disclosed under Item 404 of
   Regulation S-K under the Securities Act.

      (w) EMPLOYMENT MATTERS. Except as set forth in the HCIA Disclosure
   Schedule, to the best knowledge of HCIA, no vice president or key group of
   employees has any plans to terminate their employment with HCIA or any of
   its subsidiaries as a result of the transactions contemplated hereby or
   otherwise. HCIA and each subsidiary is in compliance with all laws relating
   to the employment or the workplace, including, without limitation,
   provisions relating to wages, hours, collective bargaining, safety and
   health, work authorization, equal employment opportunity, immigration and
   the withholding of income taxes, unemployment compensation, worker's
   compensation, employee privacy and right to know and social security
   contributions, except where noncompliance would not, individually or in the
   aggregate, have or be reasonably likely to have a material adverse effect
   on HCIA or any of its subsidiaries.

      (x) TITLE AND CONDITION OF PROPERTIES. Except as set forth in the HCIA
   Disclosure Schedule, HCIA and its subsidiaries own good and marketable
   title, free and clear of all Liens, to all of their real and personal
   property and assets shown on the December 31, 1998 audited consolidated
   financial statements of HCIA and its consolidated subsidiaries, except for
   (i) assets which have been disposed of to nonaffiliated third parties since
   December 31, 1998 in the ordinary course of business, (ii) Liens reflected
   in such financial statements or in the notes thereto, (iii) Liens or
   imperfections of title which are not, individually or in the aggregate,
   material in character, amount or extent and which do not materially detract
   from the value or materially interfere with the present or presently
   contemplated use of the assets subject thereto or affected thereby, and
   (iv) Liens for current taxes not yet due and payable. All of the machinery,
   equipment and other tangible personal property and assets owned or used by
   HCIA and its subsidiaries are in good condition and repair, except for
   ordinary wear and tear not caused by neglect, and are useable in the
   ordinary course of business. The personal property and assets of HCIA and
   its subsidiaries which are shown in the December 31, 1998 audited
   consolidated financial statements of HCIA and its consolidated subsidiaries
   or which were acquired after December 31, 1998, and the Intellectual
   Property owned or used by HCIA and its subsidiaries collectively include
   all assets necessary to provide, produce, sell and license the services and
   products currently provided, produced, sold and licensed by HCIA and its
   subsidiaries and to conduct the business of HCIA and its subsidiaries as
   presently conducted or as currently contemplated to be conducted.

      (y) NET OPERATING LOSS CARRYFORWARDS. To the best knowledge of HCIA,
   after consulting with its outside tax accountants, the net operating loss
   carryforwards of HCIA and its subsidiaries as of August 11, 1999 are in
   excess of $107,000,000 and constitute valid net carryforwards which have
   been properly and accurately recorded on the consolidated financial
   statements of HCIA in accordance with GAAP applied on a consistent basis.

      (z) FULL DISCLOSURE. None of the representations or warranties made by
   HCIA herein or in any schedule hereto, including the HCIA Disclosure
   Schedule, or any certificate furnished by HCIA pursuant to this Agreement,
   contains or will contain at the Effective Time any untrue statement of a
   material fact, or omits or will omit at the Effective Time, to state any
   material fact necessary in order to make the statements contained herein or
   therein, in the light of the circumstances under which made, not
   misleading.


                                  ARTICLE IV
                   COVENANTS RELATING TO CONDUCT OF BUSINESS

     SECTION 4.1 CONDUCT OF BUSINESS.

      (a) CONDUCT OF BUSINESS BY HCIA. Except as set forth in the HCIA
   Disclosure Schedule, as otherwise expressly contemplated by this Agreement
   or as consented to by Acquiror in writing, during the period from August
   11, 1999 to the Effective Time, HCIA has carried on and shall continue to
   carry on, and its subsidiaries have carried on and HCIA shall continue to
   cause them to carry on, their respective businesses in the ordinary course
   consistent with past practice and in compliance in all material respects
   with all applicable laws and regulations and, to the extent consistent


                                      15
<PAGE>

   therewith, use commercially reasonable best efforts to preserve intact
   their current business organizations, use commercially reasonable best
   efforts to keep available the services of their current officers and other
   key employees and preserve their relationships with those persons having
   business dealings with them so that their goodwill and ongoing businesses
   shall be unimpaired at the Effective Time. Without limiting the generality
   of the foregoing (but subject to the above exceptions), during the period
   from August 11, 1999 to the Effective Time, HCIA has not and shall not, and
   has not permitted and shall not permit any of its subsidiaries to:

         (i) (x) declare, set aside or pay any dividends on, make any other
      distributions payable in cash, stock, or property in respect of, or enter
      into any agreement with respect to the voting of, any of its capital
      stock, (y) split, combine or reclassify any of its capital stock or issue
      or authorize the issuance of any other securities in respect of, in lieu
      of or in substitution for shares of its capital stock, except for
      issuances of HCIA Common Stock upon the exercise of HCIA Employee Stock
      Options outstanding as of August 11, 1999 in accordance with their
      present terms (including cashless exercises) or (z) purchase, redeem or
      otherwise acquire any shares of capital stock of HCIA or any of its
      subsidiaries or any other securities thereof or any rights, warrants or
      options to acquire any such shares or other securities (except, in the
      case of clause (z), for the deemed acceptance of shares upon cashless
      exercises of HCIA Employee Stock Options, or in connection with
      withholding obligations relating thereto);

         (ii) issue, deliver, sell, pledge or otherwise encumber or subject to
      any Lien any shares of its capital stock, any other voting securities or
      any securities convertible into, or any rights, warrants or options to
      acquire, any such shares, voting securities or convertible securities
      (other than the issuance of shares of HCIA Common Stock upon the exercise
      of HCIA Employee Stock Options outstanding as of August 11, 1999 in
      accordance with their present terms);

         (iii) except as contemplated hereby, amend its articles of
      incorporation, bylaws or other comparable organizational documents;

         (iv) acquire or agree to acquire by merging or consolidating with, or
      by purchasing a substantial portion of the assets of, or by any other
      manner, any business or any person, or, except for transactions in the
      ordinary course of business consistent with past practice pursuant to
      contracts or agreements in force as of August 11, 1999 make any
      investment either by purchase of stock or securities, contributions to
      capital, property transfers, or purchase of any property or assets of any
      other individual, corporation or other entity other than a subsidiary of
      HCIA provided however, that in no event shall any such investments exceed
      $50,000 in any single case or $150,000 in the aggregate.

         (v) sell, lease, license, mortgage or otherwise encumber or subject to
      any Lien or otherwise dispose of any of its properties or assets
      (including securitizations), other than in the ordinary course of
      business consistent with past practice, including, without limitation, in
      connection with consolidation of acquired businesses or as would not have
      a material adverse effect on HCIA or any of its subsidiaries;

         (vi) take any action that would cause the representations and
      warranties set forth in Section 3.2(g) to be no longer true and correct
      or that would impair or delay the ability of HCIA to consummate the
      Merger in accordance with the terms hereof;

         (vii) other than in the ordinary course of business, make any loans or
      advances to any person (other than wholly owned subsidiaries of HCIA),
      incur any indebtedness for borrowed money or issue any debt securities or
      assume, guarantee or endorse, or otherwise as an accommodation become
      responsible for the obligations of any person for borrowed money, other
      than pursuant to a credit facility in effect as of the date hereof
      (including any replacement facilities), in the ordinary course of
      business consistent with past practice;

         (viii) settle any claim, action or proceeding involving money damages,
      except in the ordinary course of business consistent with past practice;

         (ix) other than in the ordinary course of business, enter into or
      terminate any material contract or agreement (including, without
      limitation, any of the Material Contracts), or make any change in any of
      its material leases or contracts (including, without limitation, any of
      the Material Contracts), other than amendments or renewals of contracts
      and leases without material adverse changes of terms or waive, release or
      assign any claims with respect thereto;

         (x) except for increases in accordance with normal past practice,
      increase in any manner the compensation or fringe benefits of any of its
      officers, directors or key employees, or materially increase the
      foregoing in respect of


                                      16
<PAGE>

      any other employees; enter into any commitment to pay any pension, stay
      bonus, retirement, termination or severance benefit to any such officers,
      employees, or directors, or make any material commitment to pay any of
      the foregoing to any employees; adopt or commit itself to any new
      benefit, compensation or stock option plan or arrangement; or amend,
      supplement, or accelerate the timing of payments or vesting under, or
      otherwise materially amend or supplement any existing benefit, stock
      option, profit sharing, insurance or compensation plan or arrangement
      (other than as may be required by applicable law);

         (xi) change any of the accounting methods used by HCIA or any of its
      subsidiaries unless required by generally accepted accounting principles;


         (xii) permit any material insurance policy naming it as a beneficiary
      or a loss payable payee to be canceled or terminated without notice to
      the Acquiror;

         (xiii) pay, discharge or satisfy any claims, liabilities or
      obligations (absolute, accrued, asserted or unasserted, contingent or
      otherwise), other than the payment, discharge or satisfaction in the
      ordinary course of business and consistent with past practice, of claims,
      liabilities or obligations reflected or reserved against in, or
      contemplated by, the consolidated financial statements (or the notes
      thereto) of HCIA and its consolidated subsidiaries;

         (xiv) adopt a plan of complete or partial liquidation, dissolution,
      merger, consolidation, restructuring, recapitalization or other
      reorganization of HCIA or any of its subsidiaries (other than the
      Merger); or

         (xv) authorize, or commit or agree to take, any of the foregoing
      actions or recommend, propose or announce an intention to do any of the
      foregoing

      (b) OTHER ACTIONS. Except as required by law, from August 11, 1999 to the
   Effective Time, Acquiror and HCIA have not and shall not, and have not
   permitted and shall not permit any of their respective subsidiaries to,
   voluntarily take any action that would, or that could reasonably be
   expected to, result in (i) any representation or warranty made by it
   contained in this Agreement that is qualified as to materiality becoming
   untrue or inaccurate in any respect or any such representation or warranty
   that is not so qualified becoming untrue or inaccurate in any material
   respect, (ii) the failure by it to comply in any material respect with or
   satisfy in any material respect any covenant, condition or agreement to be
   complied with or satisfied by it under this Agreement or (iii) any of the
   conditions to the Merger set forth in Article VI not being satisfied.

      (c) ADVICE OF CHANGES. From August 11, 1999 to the Effective Time,
   Acquiror and HCIA have promptly advised, and shall promptly advise, the
   other party orally and in writing to the extent it has knowledge of (i) any
   representation or warranty made by it contained in this Agreement that is
   qualified as to materiality becoming untrue or inaccurate in any respect or
   any such representation or warranty that is not so qualified becoming
   untrue or inaccurate in any material respect, (ii) the failure by it to
   comply in any material respect with or satisfy in any respect any covenant,
   condition or agreement to be complied with or satisfied by it under this
   Agreement and (iii) any change or event having, or which, insofar as can
   reasonably be foreseen, could reasonably be expected to have a material
   adverse effect on such party or on the truth of such party's
   representations and warranties or the ability of the conditions set forth
   in Article VI to be satisfied; provided, however, that no such notification
   shall affect the representations, warranties, covenants or agreements of
   the parties (or remedies with respect thereto) or the conditions to the
   obligations of the parties under this Agreement.

     SECTION 4.2 NO SOLICITATION BY HCIA.

      (a) Neither HCIA nor any of its subsidiaries shall (and HCIA shall not
   permit its officers, directors, employees, representatives and agents,
   including, but not limited to, its investment bankers, attorneys and
   accountants) directly or indirectly, encourage, solicit, participate in or
   initiate discussions or negotiations with, or provide any information to,
   any corporation, partnership, person or other entity or group (other than
   the Acquiror, the LLC or any of their representatives) concerning any
   proposal or offer to acquire 10% or more of the assets of HCIA or any of
   its subsidiaries or any capital stock of HCIA or any of its subsidiaries,
   whether by merger, tender offer, exchange offer, sale of assets or similar
   transaction involving HCIA or any subsidiary, or any division or operating
   or principal business unit of HCIA (an "Acquisition Proposal"), except that
   nothing contained in this Section 4.2 or any other provision hereof shall
   prohibit HCIA or HCIA's Board of Directors from (i) taking and disclosing
   to HCIA's stockholders a position with respect to a tender or exchange
   offer by a third party pursuant to Rules 14d-9 and 14e-2 promulgated under
   the Exchange Act, or (ii) making such disclosure to HCIA's stockholders as,
   in the good faith judgment of the Board, after receiving written advice
   from legal counsel to HCIA, is required under applicable law, provided that
   HCIA may not, except as permitted by Section 4.2(b), withdraw or modify, or
   propose to withdraw or modify, its position with respect to the Merger


                                      17
<PAGE>

   or approve or recommend, or propose to approve or recommend, any
   Acquisition Proposal, or enter into any agreement with respect to any
   Acquisition Proposal. HCIA and its representatives shall immediately cease
   any existing activities, discussions or negotiations with any parties
   conducted heretofore with respect to any of the foregoing. Notwithstanding
   the foregoing, (a) HCIA may furnish information concerning its business,
   properties or assets to any corporation, partnership, person or other
   entity or group pursuant to appropriate confidentiality agreements if in
   the opinion of the Board of Directors, after receipt of written advice from
   legal counsel to HCIA, the failure to provide such information would result
   in a significant possibility that the Board of Directors would breach or
   violate its fiduciary duties to HCIA's stockholders under applicable law,
   and (b) HCIA may negotiate and participate in discussions and negotiations
   with such entity or group concerning an Acquisition Proposal if (x) such
   entity or group has on an unsolicited basis submitted a bona fide written
   proposal to the Board of Directors of HCIA relating to any such transaction
   which the Board of Directors determines in good faith, after consultation
   with its financial advisors, represents a superior transaction to the
   Merger and is reasonably likely to be consummated, taking into account all
   legal, financial and regulatory aspects of the proposal and (y) in the
   opinion of the Board of Directors of HCIA, after receipt of written advice
   from legal counsel to HCIA, the failure to engage in such discussions or
   negotiations would result in a significant possibility that the Board of
   Directors would breach or violate its fiduciary duties to HCIA's
   stockholders under applicable law (an Acquisition Proposal which satisfies
   clauses (x) and (y) being referred to herein as a "Superior Proposal").
   HCIA shall immediately notify the Acquiror in writing of the existence of
   any proposal or inquiry received by HCIA and the identity of the party
   making such proposal or inquiry which it may receive in respect of any such
   transaction and thereafter shall keep the Acquiror fully informed on a
   current basis of any changes in the status and content of any such
   proposals.

      (b) Except as set forth herein, neither the Board of Directors of HCIA
   nor any committee thereof shall (i) withdraw or modify, or propose to
   withdraw or modify, in a manner adverse to the Acquiror or the LLC, the
   approval or recommendation by the Board of Directors or any such committee
   of this Agreement or the Merger, (ii) approve or recommend, or propose to
   approve or recommend, any Acquisition Proposal or (iii) enter into any
   agreement with respect to any Acquisition Proposal. Notwithstanding the
   foregoing, prior to the Closing Date, the Board of Directors of HCIA may
   (subject to the terms of this and the following sentence) withdraw or
   modify its approval or recommendation of this Agreement or the Merger,
   approve or recommend a Superior Proposal, or enter into an Agreement with
   respect to a Superior Proposal, in each case at any time after the tenth
   business day following the Acquiror's receipt of written notice from HCIA
   advising the Acquiror that the Board of Directors has received a Superior
   Proposal, specifying the material terms and conditions of such Superior
   Proposal and identifying the person making such Superior Proposal;
   PROVIDED, HOWEVER, that HCIA shall not enter into an agreement with respect
   to a Superior Proposal unless HCIA shall have furnished the Acquiror with
   written notice not later than ten business days in advance of any date that
   it intends to enter into such agreement and shall have caused its financial
   and legal advisors to negotiate in good faith with the Acquiror during such
   ten business day period to make such adjustments in the terms and
   conditions of this Agreement as would enable HCIA to proceed with the
   transactions contemplated hereby on such adjusted terms.


                                   ARTICLE V
                             ADDITIONAL AGREEMENTS

     SECTION 5.1 ACCESS TO INFORMATION; CONFIDENTIALITY. Subject to the
Non-Disclosure Agreement, dated April 27, 1999, entered into by HCIA and the
Acquiror (the "Non-Disclosure Agreement") and subject to applicable law, HCIA
shall, and shall cause its respective subsidiaries to, afford to Acquiror and
its officers, employees, accountants, counsel, financing sources, financial
advisors and other representatives, reasonable access during normal business
hours during the period prior to the Effective Time to all their respective
properties, books, contracts, commitments, personnel and records (provided that
such access shall not materially interfere with the business or operations of
HCIA) and, during such period, HCIA shall, and shall cause each of its
subsidiaries to, furnish promptly to Acquiror (a) a copy of each report,
schedule, registration statement and other document filed by it during such
period pursuant to the requirements of federal or state securities laws and (b)
all other information concerning its business, properties and personnel as
Acquiror and its representatives may reasonably request. No review pursuant to
this Section 5.1 shall affect any representation or warranty given by HCIA
hereunder. Acquiror will hold, and will cause its officers, employees,
accountants, counsel, financial advisors and other representatives and
affiliates to hold, any nonpublic information in accordance with the terms of
the Non-Disclosure Agreement.

     SECTION 5.2 BEST EFFORTS.

      (a) Upon the terms and subject to the conditions set forth in this
   Agreement, each of the parties agrees to use its best efforts to take, or
   cause to be taken, all actions, and to do, or cause to be done, and to
   assist and cooperate with


                                      18
<PAGE>

   the other parties in doing, all things necessary, proper or advisable to
   consummate and make effective, in the most expeditious manner practicable,
   the Merger and the other transactions contemplated by this Agreement,
   including (i) the obtaining of all necessary actions or nonactions,
   waivers, consents and approvals from Governmental Entities and the making
   of all necessary registrations and filings and the taking of all steps as
   may be necessary to obtain an approval or waiver from, or to avoid an
   action or proceeding by, any Governmental Entity, (ii) at the request of
   Acquiror, the obtaining of all necessary consents, approvals or waivers,
   and any necessary or appropriate financing arrangements, from third parties
   (it being understood and agreed that the failure to obtain any consent,
   approval or waiver after using reasonable efforts to attempt to obtain such
   consent, approval or waiver shall not be deemed a breach of this Agreement;
   provided, however, that the obligation of Acquiror to effect the Merger is
   subject to satisfaction or waiver of the condition to obtain the consents
   referred to in Section 6.3(f)), (iii) the defending of any lawsuits or
   other legal proceedings, whether judicial or administrative, challenging
   this Agreement or the consummation of the transactions contemplated by this
   Agreement, including seeking to have any stay or temporary restraining
   order entered by any court or other Governmental Entity vacated or
   reversed, and (iv) the execution and delivery of any additional instruments
   necessary to consummate the transactions contemplated by, and to fully
   carry out the purposes of, this Agreement. Notwithstanding anything to the
   contrary in this Agreement, neither HCIA nor Acquiror shall be required to
   hold separate (including by trust or otherwise) or divest any of their
   respective businesses or assets, or enter into any consent decree or other
   agreement that would materially restrict either HCIA or Acquiror in the
   conduct of its business as heretofore conducted.

      (b) HCIA and the Acquiror shall respond as promptly as practicable to all
   inquiries and requests received from any State Attorney General or other
   Governmental Entity in connection with antitrust matters.

      (c) In connection with and without limiting the foregoing, Acquiror and
   HCIA shall (i) take all action necessary to ensure that no state takeover
   statute or similar statute or regulation is or becomes applicable to this
   Agreement or any of the transactions contemplated hereby and (ii) if any
   state takeover statute or similar statute or regulation becomes applicable
   to such agreements or transactions, take all action necessary to ensure
   that such transactions may be consummated as promptly as practicable on the
   terms contemplated by this Agreement and otherwise to minimize the effect
   of such statute or regulation on the Merger and the other transactions
   contemplated by this Agreement.

     SECTION 5.3 INDEMNIFICATION, EXCULPATION AND INSURANCE.

      (a) For three years after the Effective Time, Acquiror agrees to maintain
   in effect in accordance with their terms all rights to indemnification and
   exculpation from liabilities for acts or omissions occurring at or prior to
   the Effective Time existing as of August 11, 1999 in favor of the current
   or former directors or officers of HCIA and its subsidiaries as provided in
   their respective certificates or articles of incorporation or bylaws (or
   comparable organizational documents) and any indemnification agreements of
   HCIA.

      (b) In the event that Acquiror or any of its successors or assigns (i)
   consolidates with or merges into any other person and is not the continuing
   or surviving corporation or entity of such consolidation or merger or (ii)
   transfers or conveys all or substantially all of its properties and assets
   to any person, then, and in each such case, proper provision will be made
   so that the successors and assigns of Acquiror assume the obligations set
   forth in this Section 5.3.

      (c) Acquiror shall provide to HCIA's current directors and officers, for
   a period of at least two years after the Effective Time, liability
   insurance covering acts or omissions occurring prior to the Effective Time
   with respect to those persons who are currently covered by HCIA's
   directors' and officers' liability insurance policy on terms with respect
   to such coverage and amount no less favorable in any material respect than
   those of such policy in effect on August 11, 1999.

      (d) The provisions of this Section 5.3 (i) are intended to be for the
   benefit of, and will be enforceable by, each indemnified party, his or her
   heirs and his or her representatives and (ii) are in addition to, and not
   in substitution for, any other rights to indemnification or contribution
   that any such person may have by contract or otherwise.

     SECTION 5.4 FEES AND EXPENSES. Except as set forth in this Section 5.4,
Section 7.2 and Section 8.11, all fees and expenses incurred in connection with
the Merger, this Agreement and the transactions contemplated hereby shall be
paid by the party incurring such fees or expenses, whether or not the Merger is
consummated. Acquiror and HCIA shall each bear and pay fifty percent (50%) of
the costs, fees and expenses incurred in connection with (i) the filing,
printing and mailing of the Proxy Statement and (ii) the filings of the
premerger notification and report forms under the HSR Act (including filing
fees).


                                      19
<PAGE>

     SECTION 5.5 PUBLIC ANNOUNCEMENTS. HCIA and Acquiror will consult with each
other before issuing, and provide each other with the opportunity to review,
comment upon and concur with, and use commercially reasonable best efforts to
agree on, any press release or other public statements with respect to the
transactions contemplated by this Agreement, including the Merger, and shall
not issue any such press release or make any such public statement prior to
such consultation, except as either party may determine is required by
applicable law, court process or by obligations pursuant to any listing
agreement with any national securities exchange or stock market.

     SECTION 5.6 CONVEYANCE TAXES. HCIA and Acquiror shall cooperate in the
preparation, execution and filing of all returns, questionnaires, applications
or other documents regarding any real property transfer or gains, sales, use,
transfer, value added, stock transfer and stamp taxes, any transfer, recording,
registration and other fees or any similar taxes which become payable in
connection with the transactions contemplated by this Agreement that are
required or permitted to be filed on or before the Effective Time.

     SECTION 5.7 EMPLOYEE BENEFITS. Acquiror shall be responsible for
perpetuating the group health plan continuation coverages pursuant to Section
4980B of the Code and Sections 601 through 609 of ERISA ("COBRA") for all
employees of HCIA and their eligible dependents, including such individuals who
experienced a qualifying event under the COBRA rules prior to the Effective
Time.


                                  ARTICLE VI
                             CONDITIONS PRECEDENT

     SECTION 6.1 CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER.
The respective obligation of each party to effect the Merger is subject to the
satisfaction or waiver on or prior to the Closing Date of the following
conditions:

      (a) STOCKHOLDER APPROVAL. The HCIA Stockholder Approval shall have been
obtained.

      (b) GOVERNMENTAL, REGULATORY AND OTHER APPROVALS. (i) Other than the
   filing of the Certificates of Merger provided for under Section 1.3 and
   filings pursuant to the HSR Act, all consents, approvals and actions of,
   filings with and notices to any Governmental Entity required of Acquiror,
   HCIA or any of their subsidiaries to consummate the Merger and the other
   transactions contemplated hereby (the "Requisite Regulatory Approvals")
   shall have been obtained and (ii) except as would not have a material
   adverse effect on any of Acquiror, HCIA or the Surviving LLC, the consents
   and approvals set forth in Sections 3.1(b) and Section 3.2(d) hereof shall
   have been obtained or shall no longer be required.

      (c) NO INJUNCTIONS OR RESTRAINTS. No judgment, order, decree, statute,
   law, ordinance, rule or regulation, entered, enacted, promulgated, enforced
   or issued by any court or other Governmental Entity of competent
   jurisdiction or other legal restraint or prohibition (collectively,
   "Restraints") shall be in effect (i) declaring this Agreement to be
   unenforceable in any material respect or preventing the consummation of the
   Merger, or (ii) which otherwise is reasonably likely to have a material
   adverse effect on Acquiror or HCIA, as applicable; provided, however, that
   each of the parties shall have used the best efforts required by Section
   5.2(a) to prevent the entry of any such Restraints and to appeal as
   promptly as possible any such Restraints that may be entered. There shall
   not be any threatened or pending suit, action or proceeding by any
   Governmental Entity against the LLC, the Acquiror, HCIA or any subsidiary
   of HCIA (A) seeking to prohibit or impose any material limitations on the
   Acquiror's or the LLC's ownership or operation (or that of any of their
   respective subsidiaries or affiliates) of all or a material portion of
   their or HCIA's businesses or assets, or to compel HCIA or the LLC or their
   respective subsidiaries and affiliates to dispose of or hold separate any
   material portion of the business or assets of HCIA or the Acquiror and
   their respective subsidiaries, (B) seeking to restrain or prohibit the
   consummation of the Merger or the performance of any of the other
   transactions contemplated by this Agreement or the Voting Agreement, or
   seeking to obtain from HCIA, the Acquiror or the LLC any damages that are
   material in relation to HCIA and its subsidiaries taken together as a
   whole, (C) seeking to impose material limitations on the ability of the
   LLC, or render the LLC unable, to accept for payment, pay for or purchase
   some or all of the shares of HCIA Common Stock pursuant to the Merger or
   (D) which otherwise would prohibit the consummation of the Merger.

     SECTION 6.2 CONDITIONS TO OBLIGATIONS OF HCIA. The obligation of HCIA to
effect the Merger is further subject to satisfaction or waiver of the following
conditions:

      (a) REPRESENTATIONS AND WARRANTIES. The representations and warranties of
   Acquiror set forth herein shall be true and correct in all respects, both
   when made and at and as of the Closing Date, as if made at and as of such
   time (except


                                      20
<PAGE>

   to the extent expressly made as of an earlier date, in which case as of
   such date), except where the failure of such representations and warranties
   to be so true and correct (without giving effect to any limitation as to
   "materiality" or "material adverse effect" set forth therein) does not
   have, and is not likely to have, individually or in the aggregate, a
   material adverse effect on the Acquiror.

      (b) PERFORMANCE OF OBLIGATIONS OF ACQUIROR. Acquiror shall have performed
   in all material respects all obligations required to be performed by it
   under this Agreement at or prior to the Closing Date.

      (c) OPINION. HCIA shall have received an opinion of Proskauer Rose LLP,
   counsel to the Acquiror and the LLC, or from the in-house general counsel
   of such entities, substantially in the form of Exhibit 6.2(c).

      (d) CERTIFICATE. The Acquiror shall have delivered a certificate, dated
   as of the Closing, to HCIA executed on its behalf by its Managing Member to
   the effect that the conditions set forth in Sections 6.2(a) and (b) have
   been satisfied by the Acquiror.

     SECTION 6.3 CONDITIONS TO OBLIGATIONS OF ACQUIROR. The obligation of
Acquiror to effect the Merger is further subject to satisfaction or waiver of
the following conditions:

      (a) REPRESENTATIONS AND WARRANTIES. The representations and warranties of
   HCIA set forth herein shall be true and correct in all respects both when
   made and at and as of November 19, 1999 , as if made at and as of such time
   (except to the extent expressly made as of an earlier date, in which case
   as of such date), except where the failure of such representations and
   warranties to be so true and correct (without giving effect to any
   limitation as to "materiality," or "material adverse effect" set forth
   therein) does not have, and is not likely to have, individually or in the
   aggregate, a material adverse effect on HCIA and any of its subsidiaries
   taken as a whole.

      (b) PERFORMANCE OF OBLIGATIONS OF HCIA. HCIA shall have performed in all
   material respects all obligations required to be performed by it under this
   Agreement at or prior to the Closing Date.

      (c) HCIA RIGHTS AGREEMENT. The HCIA Rights issued pursuant to the HCIA
   Rights Agreement shall have been terminated or shall not have become
   nonredeemable, exercisable, distributed or triggered pursuant to the terms
   of such agreement.

      (d) OPINION. The Acquiror shall have received an opinion of Whiteford,
   Taylor & Preston L.L.P., counsel to HCIA and its subsidiaries,
   substantially in the form of Exhibit 6.3(d); and

      (e) MATERIAL ADVERSE CHANGE. From August 11, 1999 through November 19,
   1999, there shall not have occurred any changes, events or occurrences that
   would or would reasonably be expected to result, individually or in the
   aggregate, in a material adverse effect on HCIA and its subsidiaries taken
   as a whole (other than any material adverse changes, events or
   circumstances resulting solely from the failure to obtain any consent,
   approval or waiver referred to in Section 5.2 (a)(ii), if HCIA shall have
   complied with all its obligations therein).

      (f) CONSENTS. All consents required under the December 6, 1995 Informix
   Software, Inc. contract to keep such contract in full force and effect
   following the consummation of the Merger shall have been obtained without
   any terms or conditions that the Acquiror determines in its sole discretion
   to be unreasonably burdensome to the Acquiror or the LLC or the operations
   of HCIA on a going forward basis, and shall be in effect as of the
   Effective Time.

      (g) CERTIFICATE. HCIA shall have delivered a certificate, dated as of the
   Closing, to the Acquiror executed on its behalf by its President to the
   effect that the conditions set forth in Sections 6.3(a), (b), (c) and (e)
   have been satisfied by HCIA.


                                  ARTICLE VII
                       TERMINATION, AMENDMENT AND WAIVER

     SECTION 7.1 TERMINATION. This Agreement may be terminated at any time
prior to the Effective Time, and except in the case of Sections 7.1(e) or
7.1(g) whether before or after the HCIA Stockholder Approval:

      (a) by mutual written consent of HCIA and the Acquiror;

      (b) by either HCIA or the Acquiror:

                                      21
<PAGE>

         (i) if the Merger shall not have been consummated by December 31,
      1999; provided however, that the right to terminate this Agreement
      pursuant to this Section 7.1(b)(i) shall not be available to any party
      whose failure to perform any of its obligations under this Agreement
      results in the failure of the Merger to be consummated by such time;

         (ii) if the HCIA Stockholder Approval shall not have been obtained at
      an HCIA Stockholders' Meeting duly convened therefor or at any
      adjournment or postponement thereof;

         (iii) if any Restraint having any of the effects set forth in Section
      6.1(d) shall be in effect and shall have become final and nonappealable,
      or if any Governmental Entity that must grant a Requisite Regulatory
      Approval has denied approval of the Merger and such denial has become
      final and nonappealable; provided, that the party seeking to terminate
      this Agreement pursuant to this Section 7.1(b)(iii) shall have used the
      best efforts required by Section 5.2(a) to prevent the entry of and to
      remove such Restraint or to obtain such Requisite Regulatory Approval, as
      the case may be;

      (c) by HCIA (provided that HCIA is not then in breach of any
   representation, warranty, covenant or other agreement contained herein), if
   Acquiror shall have breached or failed to perform any of its
   representations, warranties, covenants or other agreements contained in
   this Agreement, which breach or failure to perform (A) would give rise to
   the failure of a condition set forth in Section 6.2(a) or (b), and (B) is
   incapable of being cured by Acquiror or is not cured within 30 days of
   written notice thereof from HCIA;

      (d) by the Acquiror (provided that Acquiror is not then in breach of any
   representation, warranty, covenant or other agreement contained herein), if
   HCIA shall have breached or failed to perform any of its representations,
   warranties, covenants or other agreements contained in this Agreement,
   which breach or failure to perform (A) would give rise to the failure of a
   condition set forth in Section 6.3(a) or (b), and (B) is incapable of being
   cured by HCIA or is not cured within 30 days of written notice thereof from
   the Acquiror;

      (e) by the Acquiror, at any time prior to the HCIA Stockholders' Meeting,
   if the HCIA Board of Directors shall have (A) failed to include in the
   Proxy Statement sent to the stockholders of HCIA its recommendation without
   modification or qualification that such stockholders approve this Agreement
   and the transactions contemplated hereby, or (B) subsequently withdrawn
   such recommendation or (C) modified or qualified such recommendation in a
   manner adverse to the interests of Acquiror;

      (f) by the Acquiror if the Board of Directors of HCIA shall have failed
   to take any of the actions contemplated by Section 1.6 as a result of the
   exercise of its rights under Section 1.6(e); or

      (g) by HCIA if it enters into a definitive agreement in connection with a
   Superior Proposal in accordance with Section 4.2(b).

     SECTION 7.2 EFFECT OF TERMINATION.

      (a) In the event of termination of this Agreement as provided in Section
   7.1 hereof, and subject to the provisions of Section 8.1 hereof, this
   Agreement shall forthwith become void and there shall be no liability on
   the part of any of the parties, except (i) as set forth in this Section 7.2
   and in Sections 3.1(d), 3.2(n), 5.3 and 5.4 hereof, and (ii) nothing herein
   shall relieve any party from liability for fraud, or any willful breach
   hereof.

      (b) If this Agreement is terminated (i) by Acquiror pursuant to Section
   7.1(e) hereof, (ii) by Acquiror pursuant to Section 7.1(d) hereof,
   including, without limitation, as a result of HCIA's breach of Sections 4.2
   or 1.6 hereof which, in the case of Section 1.6 only, is not cured within
   30 days after notice thereof to HCIA, (iii) by Acquiror pursuant to Section
   7.1(f) hereof, or (iv) by HCIA pursuant to Section 7.1(g) hereof, and, (1)
   prior to the termination of this Agreement, an Acquisition Proposal at a
   price and on terms at least as favorable to the stockholders of HCIA as the
   Merger shall have been made, and within one year of such termination HCIA
   consummates such Acquisition Proposal or (2) within 18 months of such
   termination HCIA enters into an agreement for a different Acquisition
   Proposal (whether or not with a party that had previously made an
   Acquisition Proposal to HCIA), in either case at a price and on terms at
   least as favorable to the stockholders of HCIA as the Merger, then HCIA
   shall pay to the Acquiror (concurrently with such termination, in the case
   of a termination pursuant to Section 7.1(g) hereof), and not later than the
   consummation of such Acquisition Proposal in any other event) a fee (the
   "Termination Fee") in an amount equal to 3 1/2% of the aggregate Merger
   Consideration payable to all of the stockholders of HCIA pursuant to the
   terms hereof plus an amount up to $1,000,000 to reimburse the Acquiror for
   all of its costs, fees and expenses (including, without limitation,


                                      22
<PAGE>

   all legal, investment banking and accounting costs, fees and expenses) in
   connection with the Merger and this Agreement (the "Expense Reimbursement
   Payment").

      (c) If the Agreement shall terminate for any reason, other than as
   provided in Sections 7.1(a), 7.1(c) or 7.2(b) hereof, then HCIA shall pay
   to the Acquiror up to $1,000,000 to reimburse the Acquiror for all of its
   costs, fees and expenses (including, without limitation, all legal,
   investment banking and accounting costs, fees and expenses) incurred in
   connection with this Agreement, such payment to be made no later than one
   business day following the date of delivery of the notice of termination to
   the other party.

      (d) HCIA and Acquiror agree that the agreements contained in Section
   7.2(b) and Section 7.2(c) above (i) shall be the sole and exclusive
   remedies of Acquiror against HCIA for termination of the Agreement and
   Acquiror's remedies against HCIA shall be limited to the sums stipulated in
   Section 7.2(b) and Section 7.2(c) regardless of the circumstances giving
   rise to such termination and (ii) are an integral part of the transactions
   contemplated by this Agreement and constitute liquidated damages and not a
   penalty. If HCIA fails to promptly pay any payments due to the Acquiror
   under Sections 7.2(b) or 7.2(c), it shall pay all of the costs, fees and
   expenses (including all legal costs, fees and expenses) in connection with
   any action, including the filing of any lawsuit or other legal action,
   taken to collect payment.

     SECTION 7.3 AMENDMENT. Subject to compliance with applicable law, this
Agreement may be amended by the parties at any time before or after the HCIA
Stockholder Approval; provided, however, that after any such approval, there
may not be, without further approval of the stockholders of HCIA, any amendment
of this Agreement that changes the amount or the form of the consideration to
be delivered to the holders of HCIA Common Stock hereunder, or which by law
otherwise expressly requires the further approval of such stockholders. This
Agreement may not be amended except by an instrument in writing signed on
behalf of each of the parties hereto and duly approved by each of the parties'
hereto.

     SECTION 7.4 EXTENSION; WAIVER. At any time prior to the Effective Time, a
party may, subject to the proviso of Section 7.3 (and for this purpose treating
any waiver referred to below as an amendment), (a) extend the time for the
performance of any of the obligations or other acts of the other parties, (b)
waive any inaccuracies in the representations and warranties of the other
parties contained in this Agreement or in any document delivered pursuant to
this Agreement or (c) waive compliance by the other party with any of the
agreements or conditions contained in this Agreement. Any agreement on the part
of a party to any such extension or waiver shall be valid only if set forth in
an instrument in writing signed on behalf of such party. Any extension or
waiver given in compliance with this Section 7.4 or failure to insist on strict
compliance with an obligation, covenant, agreement or condition shall not
operate as a waiver of, or estoppel with respect to, any subsequent or other
failure.


                                      23
<PAGE>

                                 ARTICLE VIII
                              GENERAL PROVISIONS

     SECTION 8.1 NONSURVIVAL OF REPRESENTATIONS AND WARRANTIES. None of the
representations and warranties in this Agreement or in any instrument delivered
pursuant to this Agreement shall survive the Effective Time. This Section 8.1
shall not limit any covenant or agreement of the parties which by its terms
contemplates performance after the Effective Time.

     SECTION 8.2 NOTICES. All notices, requests, claims, demands and other
communications under this Agreement shall be in writing and shall be deemed
given if delivered personally, telecopied (which is confirmed) or sent by
overnight courier (providing proof of delivery) to the parties at the following
addresses (or at such other address for a party as shall be specified by like
notice):

   (a)  if to HCIA, to: HCIA Inc.
              300 East Lombard Street
              Suite 1700
              Baltimore, Maryland 21202
              Telecopy No.: (410) 837-0681
              Attention: Charles A. Berardesco, Esq.
                         Senior Vice President and
                         General Counsel

    with a copy to: Whiteford, Taylor & Preston L.L.P.
              Seven Saint Paul Street
              Baltimore, Maryland 21202
              Telecopy No.: (410) 347-9478
              Attention: D. Scott Freed, Esq.

    and to:   Latham & Watkins
              1001 Pennsylvania Avenue, N.W.
              Suite 1300
              Washington D.C. 20004
              Telecopy No.: (202) 637-2201
              Attention: Bruce E. Rosenblum, Esq.

   (b) if to Acquiror, the LLC or the Merger Sub to:
          c/o VS&A Communications Partners III, L.P.
              350 Park Avenue
              New York, N.Y. 10022
              Telecopy No.: (212) 935-0877
              Attention: Jeffrey Stevenson,
                         Senior Managing Member

     with a copy to: VS&A Communications Partners III, L.P.
              350 Park Avenue
              New York, N.Y. 10022
              Telecopy No.: (212) 935-0877
              Attention: Jonathan Drucker, Esq.,
                         General Counsel

     and to:  Proskauer Rose LLP
              1585 Broadway
              New York, New York 10036
              Telecopy No.: (212) 969-2900
              Attention: Bertram A. Abrams, Esq. and Edward W. Kerson, Esq.


                                      24
<PAGE>

   SECTION 8.3 DEFINITIONS. For purposes of this Agreement:

      (a) an "affiliate" of any person means another person that directly or
   indirectly, through one or more intermediaries, controls, is controlled by,
   or is under common control with, such first person, where "control" means
   the possession, directly or indirectly, of the power to direct or cause the
   direction of the management policies of a person, whether through the
   ownership of voting securities, by contract, as trustee or executor, or
   otherwise;

      (b) "best knowledge" of any person which is not an individual means the
   knowledge of such person's directors and executive officers after due
   inquiry with respect thereto;

      (c) "material adverse effect" when used in connection with Acquiror or
   HCIA means any change or effect that is materially adverse to the financial
   condition, results of operations, business, properties, assets or
   liabilities of such party and its subsidiaries taken as a whole.

      (d) "person" means an individual, corporation, partnership, limited
   liability company, joint venture, association, trust, unincorporated
   organization or other entity; and

      (e) a "subsidiary" of any person means another person, an amount of the
   voting securities, other voting ownership or voting partnership interests
   of which is sufficient to elect at least a majority of its Board of
   Directors or other governing body (or, if there are no such voting
   interests, 50% or more of the equity interests of which) which is owned
   directly or indirectly by such first person.

     SECTION 8.4 INTERPRETATION. When a reference is made in this Agreement to
an Article, Section or Exhibit, such reference shall be to an Article or
Section of, or an Exhibit to, this Agreement unless otherwise indicated.
Whenever the words "include," "includes" or "including" are used in this
Agreement, they shall be deemed to be followed by the words "without
limitation." The words "hereof," "herein" and "hereunder" and words of similar
import when used in this Agreement shall refer to this Agreement as a whole and
not to any particular provision of this Agreement. All terms defined in this
Agreement shall have the defined meanings used herein when used in any
certificate or other document made or delivered pursuant hereto unless
otherwise defined therein. The definitions contained in this Agreement are
applicable to the singular as well as the plural forms of such terms and to the
masculine as well as to the feminine and neuter genders of such term. Any
agreement, instrument or statute defined or referred to herein or in any
agreement or instrument that is referred to herein means such agreement,
instrument or statute as from time to time amended, modified or supplemented,
including (in the case of agreements or instruments) by waiver or consent and
(in the case of statutes) by succession of comparable successor statutes and
references to all attachments thereto and instruments incorporated therein.
References to a person are also to its permitted successors and assigns.

     SECTION 8.5 COUNTERPARTS. This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been signed by each
of the parties and delivered to the other parties.

     SECTION 8.6 ENTIRE AGREEMENT; NO THIRD-PARTY BENEFICIARIES. This Agreement
(including the documents, exhibits, disclosure schedules and the other
documents and instruments referred to herein) and the Non-Disclosure Agreement
(a) constitute the entire agreement among the parties hereto, and supersede all
prior agreements and understandings, both written and oral, between the parties
with respect to the subject matter of this Agreement and (b) except for the
provisions of Section 5.3 are not intended to confer upon any person other than
the parties any rights or remedies.

     SECTION 8.7 GOVERNING LAW. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of Maryland, regardless of
the laws that might otherwise govern under applicable principles of conflict of
laws thereof.

     SECTION 8.8 ASSIGNMENT. Neither this Agreement nor any of the rights,
interests or obligations under this Agreement shall be assigned, in whole or in
part, by operation of law or otherwise by any of the parties hereto without the
prior written consent of the other parties, except that HCIA may assign, in its
sole discretion, any or all of its rights, interests and obligations hereunder
to the Acquiror, the LLC or to any indirect or direct wholly owned subsidiary
or parent of the LLC. Any assignment in violation of the preceding sentence
shall be void. Subject to the preceding two sentences, this Agreement will be
binding upon, inure to the benefit of, and be enforceable by, the parties and
their respective successors and assigns.

     SECTION 8.9 HEADINGS, ETC. The headings and table of contents contained in
this Agreement are for reference purposes only and shall not affect in any way
the meaning or interpretation of this Agreement.

     SECTION 8.10 SEVERABILITY. If any term or other provision of this
Agreement is invalid, illegal or incapable of being enforced by any rule of law
or public policy, all other conditions and provisions of this Agreement shall
nevertheless remain


                                      25
<PAGE>

in full force and effect, insofar as the foregoing can be accomplished without
materially affecting the economic benefits anticipated by the parties to this
Agreement. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall promptly
negotiate in good faith to modify this Agreement so as to effect the original
intent of the parties as closely as possible to the fullest extent permitted by
applicable law in an acceptable manner to the end that the transactions
contemplated hereby are fulfilled to the fullest extent possible.

     SECTION 8.11 TRANSFER AND SIMILAR TAXES. Notwithstanding any other
provision of this Agreement to the contrary, each of the stockholders of HCIA
shall be solely responsible for the payment of any sales, use, privilege,
transfer, documentary, gains, stamp, duties, recording and similar taxes and
fees (including any penalties, interest and additions to such fees) incurred in
connection with the conversion of shares of HCIA Common Stock pursuant to this
Agreement and for the accurate filing of all necessary tax returns and other
documentation with respect to any transfer tax.

     IN WITNESS WHEREOF, HCIA, Acquiror, LLC and Merger Sub have caused this
Agreement to be signed by their respective officers thereunto duly authorized,
all as of the date first written above.


                                        HCIA INC.


                                        By: /s/   GEORGE D. PILLARI
                                          -------------------------------------
                                                  GEORGE D. PILLARI
                                        CHAIRMAN OF THE BOARD OF DIRECTORS AND
                                                CHIEF EXECUTIVE OFFICER



                                        VS&A COMMUNICATIONS PARTNERS III, L.P.


                                        By: VS&A Equities III, L.L.C., its
                                        General Partner


                                        By: /s/     JEFFREY T. STEVENSON
                                          -------------------------------------
                                                   JEFFREY T. STEVENSON
                                                  SENIOR MANAGING MEMBER



                                        VS&HCIA, L.L.C.


                                        By: /s/    JEFFREY T. STEVENSON
                                          -------------------------------------
                                                   JEFFREY T. STEVENSON
                                                     MANAGING MEMBER



                                        VS&HCIA, INC.


                                        By: /s/    JEFFREY T. STEVENSON
                                          -------------------------------------
                                                   JEFFREY T. STEVENSON
                                                        PRESIDENT

                                      26


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