CONCENTRA MANAGED CARE INC
SC 13E4, 1999-07-20
SPECIALTY OUTPATIENT FACILITIES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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

                                 SCHEDULE 13E-4

                          ISSUER TENDER OFFER STATEMENT
                      (PURSUANT TO SECTION 13(e)(1) OF THE
                        SECURITIES EXCHANGE ACT OF 1934)

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

                          CONCENTRA MANAGED CARE, INC.
                                (Name of Issuer)

                          CONCENTRA MANAGED CARE, INC.
                      (Name of Person(s) Filing Statement)

                   6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
                  4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003
                         (Title of class of Securities)

                                    20589TAA1
                                    674623AA1

                                    20589TAB9
                                    20589TAC7
                      (CUSIP Number of Class of Securities)


                                DANIEL J. THOMAS
                          CONCENTRA MANAGED CARE, INC.
                                 312 UNION WHARF
                           BOSTON, MASSACHUSETTS 02109
                                 (617) 367-2163

                                 WITH COPIES TO:

       OTHON A. PROUNIS, ESQ.                   RICHARD A. PARR II
     REBOUL, MACMURRAY, HEWITT,            CONCENTRA MANAGED CARE, INC.
          MAYNARD & KRISTOL                    5080 SPECTRUM DRIVE
        45 ROCKEFELLER PLAZA                 SUITE 400, WEST TOWER
      NEW YORK, NEW YORK 10111                ADDISON, TEXAS 75001
           (212) 841-5700                        (800) 232-3550

<PAGE>

   (Name, Address and Telephone Number of Person Authorized to Receive Notices
         and Communications on Behalf of the Person(s) Filing Statement)

                                July 20, 1999

     (Date Tender Offer First Published, Sent or Given to Security Holders)


                            CALCULATION OF FILING FEE

     Transaction Valuation*                Amount Of Filing Fee
     $328,281,875                          $65,657

     * For purposes of calculating amount of filing fee only. The purchase price
     of the 6% Convertible Subordinated Notes Due 2001 (the "6% Notes'), as
     described herein, is $1,002.50 per $1,000 principal amount of the 6% Notes.
     As of July 19, 1999, there were $97,750,000 aggregate principal amount of
     the 6% Notes outstanding, resulting in an aggregate purchase price,
     assuming all 6% Notes are tendered, of $97,994,375. The purchase price of
     the 4.5% Convertible Subordinated Notes Due 2003 (the "4.5% Notes"), as
     described herein, is $1,001.25 per $1,000 principal amount of the 4.5%
     Notes. As of July 19, 1999, there were $230,000,000 aggregate principal
     amount of the 4.5% Notes outstanding, resulting in an aggregate purchase
     price, assuming all 4.5% Notes are tendered, of $230,287,500.The amount of
     the filing fee calculated in accordance with Rule 0-11 of the Securities
     Exchange Act of 1934, as amended equals 1/50th of one percent of
     $328,281,875 which is the total purchase price for the 6% Notes and the
     4.5% notes..

|_|  Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
     and identify the filing with which the offsetting fee was previously paid.
     Identify the previous filing by registration statement number, or the form
     or schedule and the date of its filing.



Amount previously paid:      NONE            Filing party:     NOT APPLICABLE
                           -------                           -----------------
Form or registration no.:    NOT APPLICABLE  Date filed:       NOT APPLICABLE
                           -----------------                 -----------------


<PAGE>


ITEM 1.           SECURITY AND ISSUER.

         (a) The issuer is Concentra Managed Care, Inc., a Delaware corporation
(the "Company"). The Company's principal executive offices are located at 312
Union Wharf, Boston, Mass. 02109.

         (b) As of July 19, 1999, there was $97,750,000 aggregate principal
amount of the 6% Convertible Subordinated Notes Due 2001 of the Company (the "6%
Notes") outstanding and $230,000,000 aggregate principal amount of the 4.5%
Convertible Subordinated Notes Due 2003 of the Company (the "4.5% Notes" and,
together with the 6% Notes, the "Notes") outstanding. The Company is offering to
purchase (i) all of its outstanding 6% Notes for a cash purchase price of
$1,002.50 per $1,000 principal amount of 6% Notes, plus accrued and unpaid
interest to, but not including, the date of payment and (ii) all of its
outstanding 4.5% Notes for a cash purchase price of $1,001.25 per $1,000
principal amount of 4.5% Notes, plus accrued and unpaid interest up to, but not
including, the date of payment, upon the terms and subject to the conditions set
forth in the Offer to Purchase dated July 20, 1999 (the "Offer to Purchase") and
in the related Letter of Transmittal (the "Letter of Transmittal"), copies of
which are filed herewith as Exhibits (a)(1) and (a)(2), respectively. The
Company is not aware that any of its directors, officers or affiliates will be
tendering Notes pursuant to the tender offer. The information set forth under
"Principal Terms of the Offers" of the Offer to Purchase is incorporated herein
by reference.

         (c) The information set forth under "Price Range of the Notes" of the
Offer to Purchase is incorporated herein by reference.

         (d) Not applicable.

ITEM 2.           SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         (a) and (b) The information set forth under "Purpose and Background of
the Offers" and "Source and Amount of Funds" of the Offer to Purchase is
incorporated herein by reference.

ITEM 3.           PURPOSE OF THE TENDER OFFER AND PLANS OR PROPOSALS OF THE
                  ISSUER OR AFFILIATE.

         (a) - (j) The information set forth under "Purpose and Background of
the Offers", "Consolidated Pro Forma Financial Statements (Unaudited)" and
"Source and Amount of Funds" of the Offer to Purchase is incorporated herein by
reference.

ITEM 4.           INTEREST IN SECURITIES OF THE ISSUER.

          During the past 40 business days, there have been no transactions in
the Notes effected by the Company or any subsidiary of the Company or, to the
knowledge of the Company, by any directors or executive officers of the Company
or any subsidiary of the Company.


<PAGE>


ITEM 5.           CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
                  RESPECT TO THE ISSUER'S SECURITIES.

         The information set forth under "Purpose and Background of the Offers"
of the Offer to Purchase is incorporated herein by reference.

ITEM 6.           PERSONS RETAINED, EMPLOYED OR TO BE COMPENSATED.

         The information set forth under "Information Agent, Dealer Manager and
Depositary" of the Offer to Purchase is incorporated herein by reference.

ITEM 7.           FINANCIAL INFORMATION.

         (a) The information set forth under "Selected Consolidated Financial
Data" of the Offer to Purchase is incorporated herein by reference. The
following documents, which have been filed by the Company (File No. 1-12139)
with the Securities and Exchange Commission are incorporated herein by
reference:

             (1) Annual Report of the Company on Form 10-K/A for the fiscal year
                 ended December 31, 1998; and

             (2) Quarterly Report of the Company on Form 10-Q/A for the fiscal
                 year ended March 31, 1998; and

         (b) The information set forth under "Consolidated Pro Forma Financial
Statements (Unaudited)" of the Offer to Purchase is incorporated herein by
reference.

ITEM 8.           ADDITIONAL INFORMATION.

         (a) The information set forth under "Purpose and Background of the
Offers" is incorporated herein by reference.

         (b) There are no applicable regulatory requirements which must be
complied with or approvals which must be obtained in connection with the tender
offer other than compliance with the Securities Exchange Act of 1934, as
amended, and the rules and regulations promulgated thereunder including, without
limitation, Rule 13E-4 promulgated thereunder, and the requirements of state
securities or "blue sky" laws.

         (c) Not applicable.

         (d) None.

         (e) The information set forth in the Offer to Purchase and the Letter
of Transmittal, copies of which are filed herewith as Exhibits (a)(1) and
(a)(2), respectively, is incorporated herein by reference.

ITEM 9.           MATERIAL TO BE FILED AS EXHIBITS.

         (a)(1)   Offer to Purchase
         (a)(2)   Letter of Transmittal
         (a)(3)   Notice of Guaranteed Delivery
         (a)(4)   Letter to Brokers, Dealers, Commercial Banks, Trust Companies
                  and Other Nominees


                                       2


<PAGE>



         (a)(5)   Letter to Clients for use by Brokers, Dealers, Commercial
                  Banks, Trust Companies and Other Nominees
         (a)(6)   Guidelines for Certification of Taxpayer Identification Number
                  on Substitute Form W-9
         (a)(7)   Form of Summary Advertisement dated July 20, 1999
         (a)(8)   Text of Press Release dated July 20, 1999
         (a)(9)   Proxy Statement of Concentra Managed Care, Inc. on Schedule
                  14A filed on July 16, 1999 (Incorporated by reference under
                  File No. 1-12139
         (b)(1)   Commitment Letter dated February 28, 1999 from Chase
                  Securities Inc., The Chase Manhattan Bank, DLJ Capital
                  Funding, Inc., Credit Suisse First Boston and Fleet National
                  Bank (incorporated by reference to Exhibit (a)(1) to the
                  Schedule 13E-3 filed by Concentra Managed Care, Inc. on June
                  7, 1999)
         (b)(2)   Letter dated February 24, 1999 from Chase Capital Partners
                  (incorporated by reference to Exhibit (a)(2) to the Schedule
                  13E-3 filed by Concentra Managed Care, Inc. on June 7, 1999)
         (b)(3)   Letter dated March 1, 1999 from WCAS Capital Partners III,
                  L.P. (incorporated by reference to Exhibit (a)(3) to the
                  Schedule 13E-3 filed by Concentra Managed Care, Inc. on June
                  7, 1999)
         (c)      Amended and Restated Agreement and Plan of Merger, dated as
                  of March 24, 1999, between Yankee Acquisition Corp. and
                  Concentra Managed Care, Inc. (incorporated by reference to
                  Exhibit 2.1 to the Form 8-K filed by Concentra Managed Care,
                  Inc. on March 29, 1999)
         (d)      None
         (e)      None
         (f)      None




                                       3




<PAGE>



                                    SIGNATURE


         After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


Dated: July 20, 1999


                                             CONCENTRA MANAGED CARE, INC.



                                             By /s/ Richard Parr
                                               ------------------------------
                                                Name:Richard Parr
                                                Title:Executive Vice President
                                                      and General Counsel





                                       4



<PAGE>



                                  EXHIBIT INDEX

EXHIBIT NUMBER                      DESCRIPTION
- --------------                      -----------

         (a)(5)   Letter to Clients for use by Brokers, Dealers, Commercial
                  Banks, Trust Companies and Other Nominees
         (a)(6)   Guidelines for Certification of Taxpayer Identification Number
                  on Substitute Form W-9
         (a)(7)   Form of Summary Advertisement dated July 20, 1999
         (a)(8)   Text of Press Release dated July 20, 1999]
         (a)(9)   Proxy Statement of Concentra Managed Care, Inc. on Schedule
                  14A filed on July 16, 1999 (Incorporated by reference under
                  File No. 1-12139
         (b)(1)   Commitment Letter dated February 28, 1999 from Chase
                  Securities Inc., The Chase Manhattan Bank, DLJ Capital
                  Funding, Inc., Credit Suisse First Boston and Fleet National
                  Bank (incorporated by reference to Exhibit (a)(1) to the
                  Schedule 13E-3 filed by Concentra Managed Care, Inc. on June
                  7, 1999)
         (b)(2)   Letter dated February 24, 1999 from Chase Capital Partners
                  (incorporated by reference to Exhibit (a)(2) to the Schedule
                  13E-3 filed by Concentra Managed Care, Inc. on June 7, 1999)
         (b)(3)   Letter dated March 1, 1999 from WCAS Capital Partners III,
                  L.P. (incorporated by reference to Exhibit (a)(3) to the
                  Schedule 13E-3 filed by Concentra Managed Care, Inc. on June
                  7, 1999)
         (c)      Amended and Restated Agreement and Plan of Merger, dated as
                  of March 24, 1999, between Yankee Acquisition Corp. and
                  Concentra Managed Care, Inc. (incorporated by reference to
                  Exhibit 2.1 to the Form 8-K filed by Concentra Managed Care,
                  Inc. on March 29, 1999)
         (d)      None
         (e)      None
         (f)      None


                                       5



OFFER TO PURCHASE
                          CONCENTRA MANAGED CARE, INC.
                           OFFER TO PURCHASE FOR CASH

        ALL OF ITS OUTSTANDING 6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
                            CUSIP #: 20589T-AA-1
                                     674623-AA-1 (FORMERLY OCCUSYSTEMS, INC.)
                                     AND
       ALL OF ITS OUTSTANDING 4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003
                              CUSIP #: 20589T-AB-9
                                       20589T-AC-7
- --------------------------------------------------------------------------------

Concentra  Managed Care, Inc., a Delaware  corporation  (the "Company"),  hereby
offers to purchase,  upon the terms and subject to the  conditions  set forth in
this Offer to Purchase (the "Offer to Purchase") and in the accompanying  Letter
of  Transmittal  (the "Letter of  Transmittal"),  (i) all of its  outstanding 6%
Convertible  Subordinated  Notes due 2001 (the "6% Notes")  for a cash  purchase
price of $1,002.50  per $1,000  principal  amount of 6% Notes,  plus accrued and
unpaid  interest up to, but not  including,  the date of payment and (ii) all of
its outstanding 4.5% Convertible  Subordinated  Notes due 2003 (the "4.5% Notes"
and,  together  with the 6% Notes,  the  "Notes") for a cash  purchase  price of
$1,001.25  per $1,000  principal  amount of 4.5% Notes,  plus accrued and unpaid
interest up to, but not  including,  the date of payment.  The offer to purchase
each issue of Notes on the terms and subject to the  conditions set forth herein
and in the Letter of Transmittal is referred to  individually as an "Offer," and
such offers with respect to both issues of Notes are collectively referred to as
the "Offers."  Notwithstanding  any other provision of the Offers, the Company's
obligation to accept for purchase,  and pay for, Notes validly tendered pursuant
to the relevant Offer is subject to certain conditions,  including,  among other
things,  the  consummation  of  the  Merger  (as  defined  below)  (the  "Merger
Condition"),  and certain other conditions  described in this Offer to Purchase.
See  "Purpose  and  Background  of  the  Offers--The   Merger--Conditions"   and
"Conditions  of the Offers." The purchase of the Notes is not a condition to the
Merger. Each Offer is independent of the other.

As of July 19, 1999,  each $1,000  principal  amount of 6% Notes was convertible
into 33.67 shares (the "6% Conversion  Rate") of the Company's common stock, par
value $.01 per share ("Company Common Stock"),  equivalent to a conversion price
of  approximately  $29.70 per share. As of July 19, 1999, each $1,000  principal
amount of 4.5% Notes was  convertible  into 24.24  shares (the "4.5%  Conversion
Rate")  of  Company   Common  Stock,   equivalent  to  a  conversion   price  of
approximately  $41.25 per share.  On July 19, 1999, the last reported sale price
of the Company Common Stock on the Nasdaq National Market was $15.625.

The Offers are being made in connection  with the proposed merger (the "Merger")
of  Yankee  Acquisition  Corp.,  a  Delaware  corporation  ("Yankee")  which was
organized and is currently owned by Welsh, Carson,  Anderson & Stowe VIII, L.P.,
a Delaware limited partnership ("WCAS"), with and into the Company,  pursuant to
the Amended and  Restated  Agreement  and Plan of Merger,  dated as of March 24,
1999 (the "Merger Agreement"), between Yankee and the Company. Upon consummation
of the Merger,  each outstanding share of Company Common Stock will be converted
into the right to receive $16.50 in cash. Upon  consummation of the Merger,  the
Notes will no longer be  convertible  into shares of Company  Common  Stock.  In
accordance with the terms of the respective  Indentures (as defined below), upon
a Holder's  election to convert any or all of such Holder's Notes  following the
consummation  of the Merger,  such Holder  shall only be entitled to receive the
same kind and amount of consideration  received in the Merger by a holder of the
number of shares of Company Common Stock  issuable upon  conversion of such Note
or  Notes  immediately  prior  to  the  Merger.  As  a  result,   following  the
consummation of the Merger,  each $1,000  principal  amount of 6% Notes would be
convertible  into  $555.55  (based  on the 6%  Conversion  Rate and the right to
receive $16.50 in cash for each outstanding share of Company Common Stock in the
Merger) and each $1,000 principal amount of 4.5% Notes would be convertible into
$400.00  (based on the 4.5%  Conversion  Rate and the right to receive $16.50 in
cash for each outstanding share of Company Common Stock in the Merger).

The Company will purchase all Notes validly  tendered and not withdrawn prior to
the applicable  Expiration  Time upon the terms and subject to the conditions of
the  applicable  Offer.  Notes not purchased  pursuant to the Offers will remain
outstanding.

In order to  satisfy  the  change  of  control  repurchase  requirements  of the
Indentures,  the  Company  intends  to  commence  an  offer  to  repurchase  any
outstanding  Notes as soon as  practicable  after the  Closing  Date (as defined
below) at a repurchase  price in cash equal to 100% of the  aggregate  principal
amount  thereof,  plus  accrued  and  unpaid  interest,  if any,  to the date of
repurchase.

SEE "CERTAIN CONSIDERATIONS" AND "CERTAIN FEDERAL INCOME TAX CONSIDERATIONS" FOR
A DISCUSSION OF CERTAIN  FACTORS THAT SHOULD BE  CONSIDERED  IN  EVALUATING  THE
OFFERS.

  EACH OFFER WILL EXPIRE AT 5:00 P.M.,  NEW YORK CITY TIME,  ON TUESDAY,  AUGUST
  17, 1999 UNLESS EXTENDED OR TERMINATED  (SUCH TIME AND DATE OR THE LATEST TIME
  AND DATE TO WHICH  THE  RELEVANT  OFFER MAY BE  EXTENDED  OR  TERMINATED  WITH
  RESPECT TO EACH OF THE OFFERS,  BEING REFERRED TO AS THE  "EXPIRATION  TIME").
  HOLDERS OF NOTES MUST TENDER  THEIR NOTES PRIOR TO THE  APPLICABLE  EXPIRATION
  TIME TO RECEIVE THE APPLICABLE  PURCHASE PRICE (AS DEFINED BELOW).  TENDERS OF
  NOTES MAY BE VALIDLY  WITHDRAWN AT ANY TIME PRIOR TO THE EXPIRATION  TIME AND,
  UNLESS  THERETOFORE  ACCEPTED  FOR  PAYMENT  BY THE  COMPANY  PURSUANT  TO THE
  RELEVANT  OFFER,  MAY ALSO BE VALIDLY  WITHDRAWN  AT ANY TIME  AFTER  TUESDAY,
  SEPTEMBER 14, 1999.

                      The Dealer Manager for the Offers is:
                          DONALDSON, LUFKIN & JENRETTE
                                  July 20, 1999


<PAGE>
                                    IMPORTANT

         Any holder of Notes  (each a  "Holder"  and,  collectively,  "Holders")
desiring to tender Notes should either (i) complete and sign the relevant Letter
of  Transmittal  (or  a  manually  signed  facsimile)  in  accordance  with  the
instructions  set forth therein and mail or deliver such manually  signed Letter
of  Transmittal  (or  such  manually  signed   facsimile),   together  with  the
certificates  for such Notes and any other documents  required by that Letter of
Transmittal, to United States Trust Company of New York (the "Depositary"), (ii)
tender Notes to such Depositary's  account with the Book-Entry Transfer Facility
(as defined below) pursuant to the procedures for book-entry  transfer set forth
herein or (iii) request the Holder's  broker,  dealer,  commercial  bank,  trust
company  or other  nominee  to effect  the  transaction  for such  Holder.  Only
registered  holders of Notes are  entitled to tender  Notes.  Beneficial  owners
whose Notes are  registered in the name of a broker,  dealer,  commercial  bank,
trust  company or other  nominee must contact  such broker,  dealer,  commercial
bank,  trust  company  or other  nominee  if they  desire to tender  Notes.  See
"Procedures for Tendering Notes."

         A Holder who  desires to tender  Notes but who cannot do so on a timely
basis may tender such Notes by following the procedures for guaranteed  delivery
set forth herein. See "Procedures for Tendering Notes -- Guaranteed Delivery."

         THE OFFER TO PURCHASE AND  ACCOMPANYING  LETTER OF TRANSMITTAL  CONTAIN
IMPORTANT  INFORMATION  THAT  SHOULD BE READ  BEFORE ANY  DECISION  IS MADE WITH
RESPECT TO THE OFFERS.

         Questions  and  requests  for   assistance   may  be  directed  to  the
Information  Agent or the Dealer Manager at the addresses and telephone  numbers
set forth on the back cover of this Offer to Purchase.  Requests for  additional
copies of this  Offer to  Purchase,  the  Letter of  Transmittal,  the Notice of
Guaranteed Delivery or other documents may be directed to the Information Agent.
Beneficial  owners may also contact their  broker,  dealer,  commercial  bank or
trust company for assistance concerning the Offers.

         THE   DELIVERY  OF  THIS  OFFER  TO   PURCHASE   SHALL  NOT  UNDER  ANY
CIRCUMSTANCES  CREATE  ANY  IMPLICATION  THAT THE  INFORMATION  CONTAINED  IN OR
INCORPORATED  BY  REFERENCE  IN THIS OFFER TO PURCHASE IS CORRECT AS OF ANY TIME
SUBSEQUENT TO THE DATE HEREOF OR, IN THE CASE OF INFORMATION INCORPORATED HEREIN
BY REFERENCE,  SUBSEQUENT TO THE DATE THEREOF,  OR THAT THERE HAS BEEN NO CHANGE
IN THE  INFORMATION  SET FORTH OR  INCORPORATED  BY  REFERENCE  IN THIS OFFER TO
PURCHASE OR IN THE  BUSINESS,  CONDITION OR AFFAIRS OF THE COMPANY OR ANY OF ITS
SUBSIDIARIES.

         THIS  OFFER  TO  PURCHASE  DOES NOT  CONSTITUTE  AN OFFER TO BUY OR THE
SOLICITATION  OF AN OFFER TO SELL THE NOTES IN ANY  CIRCUMSTANCES  IN WHICH SUCH
OFFER OR  SOLICITATION  IS UNLAWFUL.  NO PERSON HAS BEEN  AUTHORIZED TO MAKE ANY
RECOMMENDATION  ON BEHALF OF THE  COMPANY AS TO WHETHER  HOLDERS  SHOULD  TENDER
NOTES  PURSUANT  TO THE  OFFERS.  NO  PERSON  HAS  BEEN  AUTHORIZED  TO GIVE ANY
INFORMATION,  OR TO MAKE ANY REPRESENTATION IN CONNECTION THEREWITH,  OTHER THAN
THOSE CONTAINED HEREIN OR IN THE ACCOMPANYING LETTER OF TRANSMITTAL.  IF MADE OR
GIVEN, SUCH RECOMMENDATION OR ANY SUCH INFORMATION OR REPRESENTATION MUST NOT BE
RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY.

                                       ii
<PAGE>


                              AVAILABLE INFORMATION

         The  Company is  currently  subject to the  information  and  reporting
requirements  of the Securities  Exchange Act of 1934, as amended (the "Exchange
Act"), and in accordance  therewith files reports and other information with the
U.S. Securities and Exchange Commission (the "Commission"). The Company has also
filed with the  Commission  an Issuer Tender Offer  Statement on Schedule  13E-4
under the Exchange Act, which includes  certain of the information  contained in
this Offer to Purchase  and certain  other  information  relating to the Offers.
Such reports and other  information  may be  inspected  and copied at the public
reference facilities maintained by the Commission at Room 1024, Judiciary Plaza,
450 Fifth Street,  N.W.,  Washington,  D.C. 20549, and at the following regional
offices of the Commission:  New York Regional Office,  Seven World Trade Center,
13th Floor,  New York,  New York  10048;  and Chicago  Regional  Office,  Atrium
Center, 500 West Madison Street, Suite 1400, Chicago,  Illinois 60661. Copies of
such  material  can  be  obtained  from  the  Public  Reference  Section  of the
Commission at 450 Fifth Street,  N.W.,  Washington,  D.C.  20549,  at prescribed
rates.  Such material may also be accessed  electronically  at the  Commission's
site on the world wide web located at  "http://www.sec.gov."  Statements made in
this Offer to Purchase  concerning  the  provisions of any contract,  agreement,
indenture or other  document  referred to herein are not  necessarily  complete.
With respect to each such statement concerning a contract, agreement,  indenture
or other  document filed with the  Commission,  reference is made to such filing
for a more complete description of the matter involved,  and each such statement
is qualified in its entirety by such reference.  In addition, the Company Common
Stock is listed and traded on the Nasdaq National  Market,  and such reports and
other information may be inspected at the offices of the National Association of
Securities Dealers, Inc., 1735 K Street, N.W., Washington, D.C. 20006.

         Additional  information concerning the Merger is contained in the proxy
statement of the  Company,  dated July 16, 1999,  filed in  connection  with the
Merger (the "Proxy  Statement")  and the Schedule  13E-3 of the Company  related
thereto. The Proxy Statement has been distributed to the Company's  stockholders
in connection  with their  consideration  of the Merger at a special  meeting of
stockholders scheduled to be held on August 17, 1999.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         For  information  about  the  Company,  Holders  are  referred  to  the
following  documents  filed  by the  Company  with  the  Commission,  which  are
incorporated  by  reference in this Offer to Purchase to the extent not modified
or superseded by documents subsequently filed (the "Incorporated Documents"):
<TABLE>
<CAPTION>
   SEC Filings (File No. 1-12139)                                                Period
- ----------------------------------------------------------------------------------------------------
<S>                                                                  <C>
Annual  Report on Form 10-K,  as amended by Form 10-K/A              Year ended  December 31,
1998  Quarterly  Report on Form 10-Q,  as amended by Form 10-Q/A     Quarter  ended March 31, 1999
Current Reports on Form 8-K                                          February 4, 1999, March 3, 1999
                                                                     March 29, 1999, April 28, 1999
                                                                     and July 19, 1999
Proxy Statement on Schedule 14A and Schedule 13E-3                   Filed on July 16, 1999
</TABLE>

         The Proxy  Statement is being  delivered to Holders  together with this
Offer to Purchase.

         Any statements  contained in a document of the Company listed above and
incorporated  by  reference  in this  Offer to  Purchase  shall be  deemed to be
modified or  superseded  for the purpose of this Offer to Purchase to the extent
that a statement contained in this Offer to Purchase modifies or supersedes such
statement.  Any such  statement so modified or  superseded  shall not be deemed,
except as so  modified  or  superseded,  to  constitute  a part of this Offer to
Purchase.  All  information  appearing in this Offer to Purchase is qualified in
its  entirety by the  information  and  financial  statements  (including  notes
thereto) appearing in the Incorporated Documents, except to the extent set forth
in the immediately preceding statement.

         All  documents  and reports  filed by the Company  pursuant to Sections
13(a),  13(c),  14 or 15(d) of the  Exchange Act after the date of this Offer to
Purchase  and  prior  to  the  Expiration  Time  shall  also  be  deemed  to  be
incorporated by reference in this Offer to Purchase and to be a part hereof from
the date of filing of such documents.  Any statement  contained in this Offer to
Purchase or  incorporated  herein by reference shall be deemed to be modified or
superseded to the extent that a statement  contained in any  documents  filed by
the Company  pursuant to Sections 13(a),  13(c), 14 or 15(d) of the Exchange Act
after the date of this Offer to Purchase modifies or supersedes such statement.

                                      iii

<PAGE>

         The Company  will  provide  without  charge to each person to whom this
Offer to Purchase is delivered, upon request, copies of (i) the Indenture, dated
as of December 24, 1996, between  OccuSystems,  Inc.  ("OccuSystems") and United
States Trust  Company of New York (the "6% Notes  Indenture")  pursuant to which
the 6% Notes were issued and the  related  Supplemental  Indenture,  dated as of
August 29, 1997, among OccuSystems, the Company, and United States Trust Company
of New York (the "6% Notes  Supplemental  Indenture")  pursuant  to which the 6%
Notes were assumed by the  Company;  (ii) the  Indenture,  dated as of March 16,
1998,  between  the  Company  and Chase Bank of Texas,  N.A.  (the  "4.5%  Notes
Indenture"  and,  together  with  the  6%  Notes  Indenture  and  the  6%  Notes
Supplemental Indenture,  the "Indentures") pursuant to which the 4.5% Notes were
issued; and (iii) any or all information and reports of the Company incorporated
by reference in this Offer to Purchase  and not  included  herewith  (other than
exhibits to such incorporated information that are not specifically incorporated
by reference  into such  information).  Written or  telephone  requests for such
copies should be directed to the Information  Agent at its address and telephone
number set forth on the back cover of this Offer to Purchase.

                           FORWARD-LOOKING STATEMENTS

         This Offer to Purchase,  including the documents that are  incorporated
by reference as set forth in  "Incorporation of Certain Documents by Reference,"
contains forward-looking statements.  These statements are based on management's
beliefs and assumptions,  based on information currently available to management
and are subject to risks and uncertainties.  Forward-looking  statements include
the information  concerning  possible or assumed future results of operations of
the  Company  set forth (1) under  "Summary,"  "Certain  Projections,"  and "The
Merger"  in  the  Proxy  Statement,   (2)  under  "Business"  and  "Management's
Discussion  and Analysis of Financial  Condition and Results of  Operations"  in
each Annual Report on Form 10-K, as amended,  and Quarterly Report on Form 10-Q,
as  amended,  incorporated  by  reference  into  this  document  and (3) in this
document  and the  documents  incorporated  by  reference  herein  preceded  by,
followed by, or that include,  the words "believes,"  "expects,"  "anticipates,"
"intends," "plans," "estimates" or similar expressions.

         Forward-looking  statements  are not  guarantees  of  performance.  The
future  results of the Company may differ  materially  from those  expressed  in
these  forward-looking  statements.  Many of these  factors that will  determine
these  results  are beyond the  ability  of the  Company to control or  predict.
Holders of Notes are cautioned not to put undue reliance on any  forward-looking
statements.

         Holders  of  Notes  should  understand  that  the  following  important
factors,  in addition to those  discussed  herein and elsewhere in the documents
which are incorporated by reference  herein,  could affect the future results of
the  Company  and  could  cause the  results  to differ  materially  from  those
expressed  in such  forward-looking  statements:  (1)  the  effect  of  economic
conditions;  (2) the  impact of  competitive  services  and  pricing,  including
through  legislative  reform;  (3)  changes in laws and  regulations,  including
changes  in  accounting   standards  and  regulations   affecting  the  workers'
compensation,  insurance  or health care  industries  in general;  (4)  customer
demand;  (5) changes in costs;  and (6)  opportunities  that may be presented or
pursued by the Company.

                                       iv

<PAGE>


                                TABLE OF CONTENTS

                                                                           PAGE
                                                                           ----
Principal Terms of the Offers ...........................................    1
Purpose and Background of the Offers ....................................    3
Price Range of the Notes ................................................    5
Certain Considerations ..................................................    6
Selected Consolidated Financial Data ....................................    7
Consolidated Pro Forma Financial Statements (Unaudited) .................    8
Conditions of the Offers ................................................   15
Expiration Time; Extension; Amendment; Termination ......................   16
Acceptance of Notes for Purchase; Payment for Notes .....................   17
Procedures for Tendering Notes ..........................................   18
Withdrawal of Tenders; Absence of Appraisal Rights ......................   21
Source and Amount of Funds ..............................................   21
Certain Federal Income Tax Considerations ...............................   21
Information Agent, Dealer Manager and Depositary ........................   22
Miscellaneous ...........................................................   22

                                       v
<PAGE>


                 TO THE HOLDERS OF CONCENTRA MANAGED CARE, INC.


                   6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
                                       AND
                  4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003


                          PRINCIPAL TERMS OF THE OFFERS

THIS OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL  CONTAIN  IMPORTANT
INFORMATION  WHICH  SHOULD BE READ  CAREFULLY  BEFORE ANY  DECISION IS MADE WITH
RESPECT TO THE OFFERS.

 The Company  .................. Concentra   Managed  Care,   Inc.,  a  Delaware
                                 corporation,  is the leading provider of health
                                 care management and cost  containment  services
                                 to the workers'  compensation,  disability  and
                                 auto  insurance   markets.   The  Company  also
                                 provides  out-of-network  medical claims review
                                 to the group  health  marketplace  and performs
                                 non-injury   services  for  over  80,000  local
                                 employees.  The Company's  principal  executive
                                 offices are located at 312 Union Wharf, Boston,
                                 Mass. 02109.

The Notes ...................... 6% Convertible  Subordinated Notes due 2001 and
                                 4.5% Convertible Subordinated Notes due 2003.

Principal  Amounts  Outstanding  As of July 19, 1999,  $97.75 million  aggregate
                                 principal  amount  of the  6%  Notes  and  $230
                                 million aggregate  principal amount of the 4.5%
                                 Notes were outstanding.

The Offers ..................... The Company is  offering to purchase  for cash,
                                 upon the terms and  subject  to the  conditions
                                 set forth in this Offer to Purchase  and in the
                                 accompanying Letter of Transmittal,  all of the
                                 outstanding  Notes  validly  tendered  and  not
                                 withdrawn  prior to the  applicable  Expiration
                                 Time, at the Purchase Prices (as defined below)
                                 set forth below.  Each Offer is  independent of
                                 the other.

The  Expiration  Time .......... Each of the  Offers  will  expire at 5:00 p.m.,
                                 New York City  time,  on  Tuesday,  August  17,
                                 1999, unless extended or earlier terminated. It
                                 is contemplated that the Expiration Time of the
                                 Offers  will  be  extended,  if  necessary,  to
                                 coincide  with the  closing  date of the Merger
                                 (the   "Closing   Date")   which  is  currently
                                 expected to occur on or about August 17, 1999.

                                 If the Merger  Agreement is terminated  and the
                                 Merger is not  consummated,  it is contemplated
                                 that the Offers will be terminated.

Payment ........................ Payment of the  applicable  Purchase  Price for
                                 Notes  purchased  in  each  Offer  will be made
                                 promptly  after  the  Expiration  Time for that
                                 Offer,  provided  that the  conditions  to that
                                 Offer,  including  consummation  of the Merger,
                                 have been satisfied or waived.  It is currently
                                 expected  that the  acceptance of the Notes for
                                 purchase  by  the  Company  will  occur  on the
                                 Closing Date and that the date of payment for a
                                 particular  issue  of Notes  will be the  third
                                 business  day after the  applicable  Expiration
                                 Time.  The Company  also  reserves the right to
                                 accept one issue of Notes for purchase  without
                                 accepting  for  purchase  Notes  of  the  other
                                 issue.

Purchase  Prices ............... THE 6%  NOTES.  The  Purchase  Price for the 6%
                                 Notes (the "6% Notes  Purchase  Price") will be
                                 $1,002.50  per  $1,000  principal  amount of 6%
                                 Notes,  plus accrued and unpaid interest up to,
                                 but not including, the date of payment.

                                 THE 4.5% NOTES. The Purchase Price for the 4.5%
                                 Notes (the "4.5%  Notes  Purchase  Price"  and,
                                 together with the 6% Notes Purchase Price,  the
                                 "Purchase Prices") will be $1,001.25 per $1,000
                                 principal  amount of 4.5% Notes,  plus  accrued
                                 and unpaid  interest up to, but not  including,
                                 the date of payment.

                                       1
<PAGE>

Conditions to Each of
the Offers ..................... The   Company's   obligation   to  accept   for
                                 purchase,   and  to  pay  for,   Notes  validly
                                 tendered  pursuant to each Offer is conditioned
                                 upon, among other things,  the Merger Condition
                                 and the General  Conditions (as defined below).
                                 See "Conditions of the Offers."

                                 The Company, in its reasonable discretion,  may
                                 waive any of the  conditions of the Offers,  in
                                 whole or in part,  with  respect  to  either or
                                 both of the Offers at any time and from time to
                                 time.

Withdrawal  Rights ............. Tenders of Notes of a  particular  issue may be
                                 validly  withdrawn  at any  time  prior  to the
                                 relevant    Expiration    Time   and,    unless
                                 theretofore accepted for payment by the Company
                                 pursuant  to the  relevant  Offer,  may also be
                                 validly  withdrawn  at any time after  Tuesday,
                                 September 14, 1999. See "Withdrawal of Tenders;
                                 Absence of Appraisal Rights."

The Trustees  .................. The  Indenture  trustee  for  the 6%  Notes  is
                                 United  States  Trust  Company of New York (the
                                 "6% Notes Trustee"),  and the Indenture trustee
                                 for the 4.5% Notes is Chase Bank of Texas, N.A.
                                 (the "4.5% Notes  Trustee"  and,  together with
                                 the 6% Notes Trustee, the "Trustees").

How to Tender Notes ............ See  "Procedures  for  Tendering   Notes."  For
                                 further   information,   please   contact   the
                                 Information  Agent  or the  Dealer  Manager  or
                                 consult your broker, dealer, commercial bank or
                                 trust company for assistance.

Additional Documentation;
Further  Information  .......... Requests for additional copies of this Offer to
                                 Purchase,  the  Letter of  Transmittal  and the
                                 Notice of Guaranteed Delivery, or for copies of
                                 the Incorporated  Documents and the Indentures,
                                 may be directed to the Information  Agent.  Any
                                 questions  or requests  for  assistance  may be
                                 directed to the Information Agent or the Dealer
                                 Manager at the addresses and telephone  numbers
                                 on the back  cover of this  Offer to  Purchase.
                                 Beneficial   owners  may  also  contact   their
                                 broker,   dealer,   commercial  bank  or  trust
                                 company for assistance concerning the Offers.



                                       2

<PAGE>


                      PURPOSE AND BACKGROUND OF THE OFFERS

        The purpose of the Offers is to acquire all or a  substantial  amount of
the outstanding Notes in connection with the consummation of the Merger.  Upon a
Change of Control  (as  defined in the  Indentures),  the Company is required to
make an offer to  repurchase  the Notes and  purchase the Notes from Holders who
elect to have their Notes  repurchased  at a  repurchase  price in cash equal to
100% of the aggregate principal amount thereof plus accrued and unpaid interest,
if any, to the date of  repurchase  (the "Change of Control  Put").  The Company
intends to commence  such offer as soon as  practicable  after the Closing Date.
The Offers do not constitute the offers to repurchase  required by the Change of
Control Put provisions of the Indentures. The Company will make a separate offer
to  repurchase  any Notes not  acquired in the Offers  pursuant to the Change of
Control Put  provisions  of the  Indentures  if the Merger is  consummated.  The
purchase of the Notes by the Company is not a condition to the Merger.

        THE MERGER

        GENERAL.  On March 2, 1999, the Company and Yankee,  which was organized
and is  currently  owned by WCAS which is a 14.97%  stockholder  of the Company,
entered into a merger agreement (the "Prior Merger Agreement") providing for the
merger of Yankee with and into the Company.  On March 24, 1999,  the Company and
Yankee  entered into the Merger  Agreement  which amended and restated the Prior
Merger Agreement.  The Merger Agreement provides that Yankee will be merged with
and into the Company,  with the Company  being the surviving  corporation.  As a
result of the Merger, the Company's existing stockholders will receive $16.50 in
cash for each  share  of  Company  Common  Stock  that  they  own,  unless  such
stockholders  exercise  and  perfect  their  dissenter's  rights.  Any shares of
Company  Common  Stock owned by the  Company,  its  subsidiaries,  Yankee or its
affiliates will be canceled in the Merger.  In connection  with the Merger,  the
Company intends to effect the Refinancing (as defined below).

        The Merger will become  effective  when a certificate of merger is filed
with the  Secretary  of  State  of  Delaware  or at such  other  time as will be
specified  in the  certificate  of merger (the  "Effective  Time").  The Company
expects the Effective Time to occur as soon as practicable after the last of the
conditions  in the Merger  Agreement has been  satisfied or waived.  Immediately
following the  consummation of the Merger,  the Company will transfer all of its
assets and its shares in its subsidiaries to Concentra Operating Corporation,  a
Nevada  corporation  and a wholly owned  subsidiary  of the Company  ("Concentra
Operating Corporation").

        FINANCING.  In order to fund the payments for the outstanding  shares of
Company Common Stock,  the refinancing of all of the Company's  existing debt at
the time of the Merger, including the Notes (the "Refinancing"), and the related
fees and expenses,  the Company, or its subsidiaries or affiliates,  intends to:
(i) borrow approximately $375 million under new senior secured credit facilities
(the "New Credit  Facilities"),  (ii) issue approximately $190 million of senior
subordinated notes (the "Senior  Subordinated Notes") in a private placement and
(iii) issue  approximately  $110 million of senior  discount  notes (the "Senior
Discount Notes") in a private placement (collectively,  the "New Financing"). In
addition,  immediately prior to the Merger, WCAS and some of its affiliates have
agreed to invest  approximately  $370  million  (including  6,343,203  shares of
Company  Common Stock and $34.5 million in principal  amount of 4.5% Notes owned
by WCAS) in Yankee, affiliates of Ferrer Freeman Thompson & Co., LLC ("FFT") has
agreed to invest approximately $30.6 million in cash in Yankee and Chase Capital
Partners,  certain  affiliates  of  Donaldson,   Lufkin  &  Jenrette  Securities
Corporation ("DLJ") and certain members of the Company's  management have agreed
to invest  approximately  $23.0  million in Yankee  (collectively,  the "Capital
Contributions").  Also,  the  Company  intends  to utilize  approximately  $71.6
million from the Company's available cash reserves.

        SENIOR  SUBORDINATED  NOTES. It is anticipated that Concentra  Operating
Corporation  will raise  approximately  $190.0 million of the funds necessary to
consummate  the Merger and  related  transactions  through  the  issuance of the
Senior  Subordinated  Notes  in the  private  capital  markets.  DLJ  and  Chase
Securities  Inc. have each  provided  WCAS with letters dated  February 24, 1999
stating  that they are highly  confident,  subject to the  assumptions  in those
letters,  that  Concentra  Operating  Corporation  will  be able  to  raise  the
necessary  funds from the  issuance of such  Senior  Subordinated  Notes.  It is
anticipated that the Senior  Subordinated  Notes will (i) be subordinated to the
New Credit  Facilities,  (ii) have registration  rights,  (iii) be redeemable by
Concentra  Operating  Corporation  after  2004,  or  up to  35%  of  the  Senior
Subordinated  Notes with the net proceeds from certain sales of equity,  (iv) be
redeemable by Concentra Operating  Corporation at the option of the holders upon
a change of control,  and (v) subject  Concentra  Operating  Corporation and its
subsidiaries  to  customary  covenants  for this type of  financing,  including,
without limitation,  restrictions on indebtedness,  dividends,  liens, affiliate
transactions, stock repurchases, assets sales and mergers.

        SENIOR  DISCOUNT  NOTES.  It is anticipated  that the Company will raise
approximately $110.0 million of the funds necessary to consummate the Merger and
related  transactions  through the issuance of the Senior  Discount Notes in the
private capital markets.  The Senior Discount Notes will be issued with warrants
to purchase  Company  Common Stock at a nominal  exercise  price.  Chase Capital
Partners and WCAS have provided  binding  commitments  in the form of commitment
letters dated February 24, 1999 and March 1, 1999, respectively, to purchase the
Senior Discount Notes from the Company.  The Company will not be required to pay
any interest

                                       3
<PAGE>

on the Senior  Discount  Notes until  2004.  It is  anticipated  that the Senior
Discount  Notes  will  (i)  be  structurally  subordinated  to  the  New  Credit
Facilities and the Senior  Subordinated  Notes, (ii) have  registration  rights,
(iii) be redeemable by the Company after 2004 (iv) be redeemable, with regard to
up to 35% of the accreted value of the Senior  Discount Notes, by the Company at
any time prior to July 2002 with the net proceeds  from certain sales of equity,
(v) be  redeemable  by the Company at the option of the holders upon a change of
control, and (v) subject the Company and its subsidiaries to customary covenants
for this type of  financing,  including,  without  limitation,  restrictions  on
indebtedness,  dividends,  liens,  affiliate  transactions,  stock  repurchases,
assets sales and mergers.

        NEW  CREDIT  FACILITIES.  It is  anticipated  that  Concentra  Operating
Corporation  will raise  approximately  $375.0 million of the funds necessary to
consummate the Merger and related  transactions through borrowings under the New
Credit Facilities.  Chase Securities Inc., The Chase Manhattan Bank, DLJ Capital
Funding,  Inc., Credit Suisse First Boston and Fleet National Bank have provided
a binding  commitment to provide the funds for the New Credit  Facilities in the
form of a commitment letter dated February 26, 1999. It is expected that the New
Credit  Facilities  will have the following  features:  (i) $375 million of term
loan  facilities,  (ii) $100 million of revolving loan facility,  (iii) terms of
six to eight years, (iv) guarantees by the Company and its  subsidiaries,  other
than its joint ventures, (v) loans may be prepaid and commitments may be reduced
in certain amounts, (vi) prepayment will be mandatory with the net proceeds from
certain sales of equity,  incurrence of certain  indebtedness  and certain asset
sales and with 50% of excess cash flow, (vii) secured by a perfected interest in
substantially  all of Concentra  Operating  Corporation's  and its subsidiaries'
tangible and intangible assets, (viii) customary representations and warranties,
and (ix)  subject the  Company  and its  subsidiaries  to  customary  covenants,
including,  without  limitation,  delivery  of  financial  statements,  reports,
accountants'  letters,  projections,  officers'  certificates,  payment of other
material   obligations,   continuation   of  business,   compliance  with  laws,
maintenance  of  property  and  insurance,  maintenance  of books  and  records,
litigation,   compliance  with   environmental   laws,  further  assurances  and
limitations on indebtedness,  liens,  guarantee  obligations,  mergers, sales of
assets, leases, dividends, capital expenditures, investments, optional payments,
transactions  with  affiliates,  sale  and  leasebacks  and  changes  in sale of
business.

        Definitive   agreements   for  the  issuance  and  sale  of  the  Senior
Subordinated Notes, the Senior Discount Notes and the New Credit Facilities have
not been negotiated or completed.  Accordingly,  the terms of such  arrangements
described  above  may  change  as a  result  of the  negotiation  of  definitive
agreements.  In addition,  each of the financings  described above is subject to
the satisfaction of numerous customary conditions,  including the condition that
no material  adverse  change to the Company has occurred and that the Merger has
been consummated.

        CONDITIONS.  The Merger will be  completed  only if certain  conditions,
including the following, are satisfied (or, in certain cases, are waived):

        o the continued  accuracy of the Company's and Yankee's  representations
          and warranties and the fulfilment of each of their promises  contained
          in the Merger Agreement;

        o the adoption of the Merger  Agreement by the  affirmative  vote of the
          holders  of a majority  of the  outstanding  shares of Company  Common
          Stock;

        o the absence of any order or  regulation  of any court or  governmental
          entity preventing or prohibiting the Merger;

        o Yankee's receipt of the New Financing to consummate the Merger;

        o the receipt by the Board of Directors of the Company (the  "Board") of
          a solvency  letter from a valuation  firm addressed to the Board as to
          the  solvency of the  Company  after  giving  effect to the Merger and
          Yankee's contemplated financing arrangements to effect the Merger.

        Consummation  of the  Merger is a  condition  of the  obligation  of the
Company to accept for purchase and pay for the Notes pursuant to the Offers. See
"Conditions of the Offers."

        The above  discussion  of the Merger is  qualified  by  reference to the
Proxy Statement being delivered to Holders together with this Offer to Purchase,
including  the full text of the Merger  Agreement  attached as Appendix A to the
Proxy Statement.

        EFFECT OF THE MERGER ON THE NOTES

        Upon  the   completion  of  the  Merger,   the  New  Financing  and  the
Refinancing,  the Company will have substantially more debt than it did prior to
the  Merger.  On a pro forma  basis,  at March  31,  1999,  the pro forma  total
stockholders'  equity (deficit) of the


                                       4
<PAGE>

Company would have been $(118.5)  million,  compared with its  historical  total
stockholders'  equity of $247.7  million at that date. On a pro forma basis,  at
March 31, 1999,  the pro forma total  long-term  debt of the Company  would have
been $647.2 million  compared with its historical total long-term debt of $327.8
million at that date. On a pro forma basis, before  restructuring and impairment
charges,  the  Company  would have had a pro forma  ratio of  earnings  to fixed
charges of 0.8x for the twelve  months ended  December 31, 1998 and 0.8x for the
three months ended March 31, 1999.  Earnings  consist of pre-tax  earnings  from
continuing operations before fixed charges. Fixed charges consist of interest on
indebtedness,  including  amortization  of debt issuance costs and one-fourth of
rent  expenses,  estimated  by  management  of the  Company  to be the  interest
component of such rentals.  See  "Consolidated  Pro Forma  Financial  Statements
(Unaudited)."

        Such high  leverage  may: (a) make it more  difficult for the Company to
satisfy its debt  obligations;  (b)  increase  the  Company's  vulnerability  to
general  adverse  economic and industry  conditions;  (c) require the Company to
dedicate a substantial  portion of its cash flow from  operations to payments on
its  indebtedness  and  therefore  limit the  Company's  ability to fund  future
working capital,  capital expenditures and other general corporate requirements;
(d) limit the Company's  flexibility in planning for, or reacting to, changes in
its business and the healthcare industry; (e) place the Company at a competitive
disadvantage  compared to companies  with less debt;  (f) limit,  along with the
financial and other  restrictive  covenants in its  indebtedness,  the Company's
ability  to borrow  additional  funds;  and (g) limit the  Company's  ability to
engage in various  transactions such as acquisitions and dispositions or to make
certain investments.

        WHETHER  OR NOT ALL OF THE NOTES ARE NOT  REPURCHASED  PURSUANT  TO THIS
OFFER TO PURCHASE, THE COMPANY INTENDS TO BORROW ALL THE AMOUNTS INCLUDED IN THE
NEW FINANCING.  THEREFORE, IF ANY NOTES ARE NOT REPURCHASED,  THE LONG-TERM DEBT
OF THE COMPANY WILL INCREASE AND THE RATIO OF ITS EARNINGS TO FIXED CHARGES WILL
DECREASE.

        STOCK QUOTATION; EXCHANGE ACT REGISTRATION

        The Company Common Stock is currently  registered under the Exchange Act
and is traded on the Nasdaq National  Market under the symbol "CCMC."  Following
the  consummation  of the Merger,  the  registration of the Company Common Stock
under the Exchange Act will be terminated and the shares of Company Common Stock
will no longer be quoted on the Nasdaq National Market.  In addition,  following
the Merger the Notes will no longer be convertible into shares of Company Common
Stock. See "Certain Considerations--Loss of Right to Convert into Company Common
Stock".

        MANAGEMENT; BOARD OF DIRECTORS

        WCAS  does  not  currently   contemplate  any  material  change  in  the
composition of the Company's current management,  although after the Merger, the
Board will consist of Messrs. John K. Carlyle,  Carlos Ferrer, D. Scott Mackesy,
Steve E. Nelson, Andrew M. Paul, Paul B. Queally, Daniel J. Thomas and two other
individuals to be designated by WCAS.

        EMPLOYMENT AGREEMENTS

        Yankee and each of Daniel J. Thomas, James M. Greenwood, Richard A. Parr
II, W. Tom Fogarty,  M.D. and Kenneth  Loffredo  have agreed that at or prior to
the  Effective  Time  they  will  amend  and  restate  the  existing  employment
agreements between such individuals and the Company. The Company will enter into
a new employment agreement with Thomas E. Kiraly on substantially the same terms
as detailed below.  The principal  terms of the amended and restated  employment
agreements are as follows:

        o each  agreement  would have a term of two years,  subject to automatic
          renewal for additional one-year terms, unless terminated in accordance
          with the agreement's terms;

        o each  agreement  would  provide for  compensation  consisting  of base
          salary   amounts,   bonuses  at  the   discretion  of  the  Board  and
          participation  in any employee benefit plan adopted by the Company for
          its employees;

        o each agreement  would provide for a severance  payment in the event of
          termination  by  the  Company  without  cause  or  resignation  by the
          employee for good reason  consisting of two years' base salary for Mr.
          Thomas and one year's base salary for Messrs. Greenwood, Kiraly, Parr,
          Fogarty and Loffredo; provided, however, if termination by the Company
          occurs within 12 months  following the Merger,  each  agreement  would
          provide for a severance payment  consisting of two and one half years'
          salary  for Mr.  Thomas  and  two  years'  base  for  each of  Messrs.
          Greenwood, Kiraly, Parr, Fogarty and Loffredo.

                            PRICE RANGE OF THE NOTES

        The Notes are  currently  traded on an  over-the-counter  basis  between
dealers.  Although  there is no  reporting  system  for the Notes,  the  Company
believes that trading in the Notes has been limited and sporadic.  Because there
is no reporting system for trading involving


                                       5
<PAGE>

the Notes,  the Company is unable to determine the trading history of the Notes.
Although  the Company  expects  the Notes may  continue to be traded in the same
manner after the  consummation  of the Offers,  to the extent that the Notes are
traded the prices of Notes may fluctuate greatly depending on the trading volume
and the balance  between buy and sell  orders.  The  Company  believes  that the
trading market for the Notes that remain outstanding after the Tender Offer will
be more limited. See "Certain Considerations --Limited Trading Market."

        Each of the Notes are currently  registered pursuant to Section 12 under
the Exchange Act.  Following the consummation of the Offers, the Company intends
to  terminate  the  registration  of the Notes  under the  Exchange  Act if such
registration is no longer required.  If the Notes are deregistered,  the Company
will no longer be subject to the  reporting  requirements  of the  Exchange  Act
other than pursuant to the terms of the Indentures.

                             CERTAIN CONSIDERATIONS

        In deciding  whether to  participate  in the Offers,  each Holder should
carefully  consider the  information  contained or  incorporated by reference in
this Offer to Purchase:

        LIMITED TRADING MARKET

        There  currently is only a limited  trading  market for the Notes which,
from time to time, trade in the  over-the-counter  market.  After the closing of
the Offers, it is anticipated that the outstanding principal amount of the Notes
available  for trading will be  significantly  reduced.  A debt  security with a
smaller  outstanding  principal amount available for trading (a smaller "float")
may command a lower price than would a comparable  debt  security with a greater
float.  Because  the  purchase  of Notes  pursuant to the Offers will reduce the
float,  the liquidity  and market price of the Notes may be adversely  affected.
The  reduced  float  may also tend to make the  trading  prices  more  volatile.
Holders of unpurchased Notes may attempt to obtain quotations for the Notes from
their brokers;  however,  there can be no assurance that any trading market will
exist for Notes following closing of the Offers. The extent of the public market
for the Notes  following  closing of the Offers  will depend  upon,  among other
things,  the remaining  principal amount of Notes  outstanding after the Offers,
the number of Holders  remaining  at such time and the  interest  of  securities
firms in making a market in the Notes.

        LOSS OF RIGHT TO CONVERT INTO COMPANY COMMON STOCK

        Upon consummation of the Merger, the Notes will no longer be convertible
into  shares  of  Company  Common  Stock.  In  accordance  with the terms of the
respective  Indentures,  upon a Holder's  election to convert any or all of such
Holder's Notes following the consummation of the Merger,  such Holder shall only
be entitled to receive the same kind and amount of consideration received in the
Merger by a holder of the number of shares of Company Common Stock issuable upon
conversion of such Note or Notes  immediately  prior to the Merger. As a result,
following the  consummation of the Merger,  each $1,000  principal  amount of 6%
Notes would be convertible into $555.55 (based on the 6% Conversion Rate and the
right to receive  $16.50 in cash for each  outstanding  share of Company  Common
Stock in the  Merger) and each  $1,000  principal  amount of 4.5% Notes would be
convertible  into $400.00  (based on the 4.5%  Conversion  Rate and the right to
receive $16.50 in cash for each outstanding share of Company Common Stock in the
Merger).

        EFFECT OF THE TRANSACTIONS

        Although the Company is offering to repurchase all of the Notes, some or
all of the Notes may remain  outstanding after  consummation of the Merger.  The
repurchase  of the Notes is not a  condition  to the  Merger  and each  Offer is
independent  of the other.  As a result of the Merger and related  transactions,
the Company will be significantly  more leveraged than prior to the Merger.  See
"Purpose and Background of the Offers -- Effect of the Merger on the Notes."

        CONTROL BY WCAS AND ITS AFFILIATES

        Immediately  following  the Merger,  WCAS and certain of its  affiliates
will own approximately 87% of the Company.  Accordingly,  after the Merger, such
investors  will  control  the  Company  and have the  power to elect  all of its
directors, appoint new management and approve or reject any action requiring the
approval of the holders of Company Common Stock,  including adopting  amendments
to the Company's  Certificate of Incorporation and approving mergers or sales of
all or substantially all of the Company's assets.  The directors elected by such
investors  will have the  authority  to make  decisions  affecting  the  capital
structure of the Company, including the issuance of additional capital stock and
the declaration of dividends.


                                       6
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

         The table below presents  selected  consolidated  historical  financial
data that has been derived from the  Company's  audited  consolidated  financial
statements.  The selected  financial data should be read in conjunction with the
Company's separate historical  consolidated financial statements,  related notes
and other  financial  information  incorporated  by reference into this Offer to
Purchase.


<TABLE>
<CAPTION>
                                                                                                  Three Months
                                                      Year Ended December 31,                    Ended March 31,
                                           ---------------------------------------------------------------------
                                         1994       1995       1996        1997      1998       1998        1999
                                         ----       ----       ----        ----      ----       ----        ----
                                                            (In thousands, except per share data)
<S>                                     <C>       <C>        <C>        <C>        <C>        <C>        <C>
Statement of Operations:
Revenues ...........................    $223,499     $305,355    $372,683    $489,318    $611,056    $144,282    $155,411
Gross profit .......................      37,093       62,435      82,755     116,679     141,759      34,384      31,674
Non-recurring charges ..............        --            898         964      38,625      33,114      12,600        --
Operating income ...................      15,928       29,446      45,194      32,315      55,200       9,124      14,216
Income before taxes ................      10,088       24,246      41,476      21,062      41,794       5,414      10,553
Provision for income taxes (1) .....       6,802        7,771      13,437      11,062      19,308       4,567       4,485
Net income before
  extraordinary items (1) ..........       3,286       16,475      28,039      10,000      22,486         847       6,068
Basic earnings per share before
  extraordinary items ..............                    $0.48       $0.69       $0.23       $0.48       $0.02       $0.13
Basic weighted average shares
  outstanding ......................      33,810       40,411      42,774      46,451      44,939      47,251
Diluted earnings per share
  before extraordinary items .......                    $0.46       $0.65       $0.22       $0.47       $0.02       $0.13
Diluted weighted average shares
outstanding ........................      35,939       43,344      46,895      47,827      47,769      47,882
Balance Sheet:
Working capital ....................     $19,117      $21,971    $116,439     $36,754    $201,870    $171,800    $202,456
Total assets .......................     113,672      188,530     367,900     482,533     656,794     581,976     671,978
Total debt .........................      83,785       34,639     142,229     206,600     327,925     297,922     327,900
Total stockholders' equity (deficit)      (5,820)     109,383     178,146     206,441     239,875     205,068     247,652
Book value per share ...............                                            $4.40       $5.02       $4.29       $5.17
Fixed charge coverage ratio (2) ....                                             1.1x        1.6x        1.0x        1.6x
</TABLE>


(1) Prior to its  recapitalization  in March of 1994, CRA Managed Care, Inc. had
    elected  to  be  taxed  as  an  "S"  corporation.  In  connection  with  its
    recapitalization,  CRA Managed Care, Inc. was required to change from an "S"
    to a "C"  corporation.  This  change  resulted  in CRA  Managed  Care,  Inc.
    recording an incremental tax provision of $3,772,000 in the first quarter of
    1994. The Company's pro forma net income for 1994 would have been $3,446,000
    higher had CRA Managed  Care,  Inc. been subject to federal and state income
    taxes during the entire period based upon an effective  tax rate  indicative
    of the statutory rate in effect during the period.


(2) The ratio of  earnings to fixed  charges is computed by dividing  the sum of
    net earnings before deducting provisions for income taxes and fixed charges,
    and adjusted for the equity in earnings of  unconsolidated  subsidiaries and
    related  distributions,  if any, by fixed charges.  Fixed charges consist of
    interest  on  debt,  including  amortization  of debt  issuance  costs,  and
    one-fourth  of rent  expenses,  estimated by  management  to be the interest
    component of such rentals.

                                       7
<PAGE>
                          CONCENTRA MANAGED CARE, INC.

             CONSOLIDATED PRO FORMA FINANCIAL STATEMENTS (UNAUDITED)

         On March 2, 1999,  the Company  entered into a definitive  agreement to
merge with Yankee, which was organized and is currently owned by WCAS which is a
14.97% stockholder of the Company. The Company's board of directors  unanimously
approved the transaction based upon the  recommendation of the special committee
of the board of  directors,  which was  formed on  October  1, 1998 to  evaluate
strategic  alternatives  in  response  to  several  unsolicited  expressions  of
interest regarding the possible acquisition of some or all of the Company Common
Stock.  On March 24, 1999,  the Company  entered into the Merger  Agreement with
Yankee.  Pursuant to the Merger Agreement,  WCAS will acquire approximately 87%,
funds managed by FFT will acquire  approximately 7% and Chase Capital  Partners,
affiliates of DLJ and certain  members of the Company's  management will acquire
approximately  6% of the  post-Merger  shares of Company Common Stock for $16.50
per share. As a result of the Merger,  each outstanding  share of Company Common
Stock will be converted into the right to receive $16.50 in cash.

         The transaction is valued at  approximately  $1,100,000,000,  including
the refinancing of  $327,750,000 of the Notes.  The transaction is structured to
be accounted for as a recapitalization and is expected to be completed in August
of 1999. The transaction is conditioned  upon certain  conditions.  See "Purpose
and Background of the Offers--The Merger--Conditions."

         To  finance  the   acquisition   of  the  Company,   WCAS  will  invest
approximately  $369,432,000 in equity  financing,  including the value of shares
and the Notes  already owned by WCAS,  and up to  $110,000,000  in  subordinated
indebtedness.  Additionally, FFT will invest approximately $30,600,000 in equity
and Chase  Capital  Partners,  affiliates  of DLJ,  and  certain  members of the
Company's management,  will invest approximately $23,000,000 in equity. WCAS has
also  received   commitments  from  various  lenders  to  provide  financing  of
$190,000,000 in Senior  Subordinated  Notes,  $375,000,000  under the new Credit
Facilties and a $100,000,000  revolving credit facility to replace the Company's
existing senior credit facility.  Additionally, the Company would utilize excess
cash on hand at the time of the Merger to help  finance the  purchase of Company
Common  Stock.  Simultaneous  with the right to receive cash for shares,  Yankee
would  merge with and into the  Company  with the  Company  being the  surviving
corporation.

         The following  consolidated pro forma financial  statements give effect
to the Merger  using the  recapitalization  method of  accounting,  after giving
effect to the pro forma  adjustments  described in the  accompanying  notes. The
current stockholders of the Company, other than WCAS, its affiliates and certain
members of the Company's management,  will have no continuing financial interest
in the Company after the  transaction.  These unaudited  consolidated  pro forma
financial  statements have been prepared from, and should be read in conjunction
with,  the Company's  historical  consolidated  financial  statements  and notes
thereto  filed on Form  10-K/A for the year ended  December  31,  1998 which are
incorporated by reference in this Offer to Purchase.

         The unaudited Consolidated Pro Forma Balance Sheet as of March 31, 1999
gives  effect to the  Merger  as if it had  occurred  on March 31,  1999 and the
Consolidated Pro Forma Statements of Operations for the three months ended March
31, 1999 and the year ended December 31, 1998 give effect to the Merger as if it
had  occurred  on  January  1,  1999 and  January  1,  1998,  respectively.  The
Consolidated  Pro Forma  Financial  Statements  of the Company do not purport to
present the  financial  position or results of operations of the Company had the
Merger  been  consummated  at the  dates  indicated,  nor are  they  necessarily
indicative  of future  operating  results or  financial  position  of the merged
companies.


                                       8
<PAGE>


         As a result of the Merger, the Company will incur certain deal fees and
financing  costs  of  approximately   $44,000,000.   These  costs  will  consist
principally  of  banking  and  professional  fees of  approximately  $17,500,000
associated  with the issuance of new debt which will be  capitalized as deferred
finance  costs  and  other  banking,   professional   and  transaction  fees  of
$26,500,000 associated with the Merger, which will be expensed. the Company will
also  incur   approximately   $4,788,000   in  non-cash   charges  for  deferred
compensation  expense related to the accelerated vesting and issuance of 195,000
shares of restricted stock as a result of the Merger.  In addition,  the Company
expects to settle  vested  in-the-money  options which will result in a non-cash
compensation charge of approximately $12,400,000.  The expensed portion of these
fees and non-cash  compensation  expense, and the related tax benefit,  have not
been reflected on the  Consolidated  Pro Forma  Statements of Operations as they
are one-time and unusual in nature.


                                       9

<PAGE>


                          CONCENTRA MANAGED CARE, INC.

                      Consolidated Pro Forma Balance Sheets
                           March 31, 1999 (Unaudited)
<TABLE>
<CAPTION>
                                                                                 Pro Forma
                                                            Concentra           Adjustments           Pro Forma
                                                        ----------------        -----------          -----------
                        Assets
                        ------
<S>                                                       <C>                 <C>                   <C>
CURRENT ASSETS:
  Cash and cash equivalents ..........................    $ 92,753,000        $283,869,000 (1)      $ 35,318,000
                                                                               675,000,000 (2)
                                                                              (293,250,000)(2)
                                                                              (679,054,000)(3)
                                                                               (44,000,000)(4)
  Marketable securities ...............................      5,003,000                  --             5,003,000
  Accounts receivable, net.............................    137,272,000                  --           137,272,000
  Prepaid expenses, tax assets and other current assets     36,109,000           4,227,000 (5)        40,336,000
                                                          ------------       -------------          ------------
          Total current assets.........................    271,137,000         (53,208,000)          217,929,000
NET PROPERTY AND EQUIPMENT.............................     89,048,000               --               89,048,000
GOODWILL AND OTHER INTANGIBLE..........................
  ASSETS, NET..........................................    285,971,000               --              285,971,000
MARKETABLE SECURITIES..................................     10,542,000               --               10,542,000
OTHER ASSETS...........................................     15,280,000          (7,093,000)(2)        25,687,000
                                                                                17,500,000 (2)
                                                          ------------       -------------          ------------
                                                          $671,978,000        $(42,801,000)         $629,177,000
                                                          ============       =============          ============
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
- ----------------------------------------------

CURRENT LIABILITIES:
 Revolving Credit Facility ...........................  $           --     $          --           $        --
 Current portion of long-term debt....................          55,000           4,000,000 (2)         4,055,000
 Accounts payable and accrued expenses................      68,626,000                  --            68,626,000
                                                          ------------       -------------          ------------
          Total current liabilities...................      68,681,000           4,000,000            72,681,000
LONG-TERM DEBT, NET OF CURRENT PORTION................     327,845,000         (34,500,000)(1,2)     647,153,000
                                                                              (293,250,000)(2)
                                                                               651,058,000 (2)
DEFERRED INCOME TAXES AND OTHER LIABILITIES                 27,800,000                  --            27,800,000
STOCKHOLDERS' EQUITY (DEFICIT):
 Common stock.........................................         473,000             256,000 (6)           256,000
                                                                                  (473,000)(7)
 Paid-in capital......................................     272,420,000          23,942,000 (2)               --
                                                                                 4,788,000 (5)
                                                                               422,776,000 (6)
                                                                              (723,926,000)(7)
 Treasury stock.......................................             --         (679,054,000)(3)               --
                                                                              (104,663,000)(8)
                                                                               783,717,000 (7)
 Unrealized gain on investments.......................           1,000                  --                 1,000
 Retained deficit.....................................     (25,242,000)        (26,500,000)(4)      (118,714,000)
                                                                                (4,788,000)(5)
                                                                                (7,093,000)(2)
                                                                                 4,227,000 (5)
                                                                               (59,318,000)(7)
                                                          ------------       -------------          ------------
          Total stockholders' equity (deficit)........     247,652,000        (366,109,000)         (118,457,000)
                                                          ------------       -------------          ------------
                                                          $671,978,000       $ (42,801,000)         $629,177,000
                                                          ============       =============          ============

                          See accompanying Notes to Consolidated Pro Forma Financial Statements.
</TABLE>

                                       10
<PAGE>


                          CONCENTRA MANAGED CARE, INC.

                 Consolidated Pro Forma Statements of Operations
              For the Three Months Ended March 31, 1999 (Unaudited)
<TABLE>
<CAPTION>
                                                                     Pro Forma
                                                  Concentra          Adjustments             Pro Forma
                                              ----------------       -----------            -----------
<S>                                               <C>               <C>                     <C>
Revenues:
  Health services ..........................     $70,622,000        $      --                $70,622,000
  Managed care services:
    Specialized cost containment ...........      46,712,000               --                 46,712,000
    Field case management ..................      38,077,000               --                 38,077,000
                                               -------------        -----------            -------------

        Total managed care services ........      84,789,000               --                 84,789,000
                                               -------------        -----------            -------------
              Total revenues ...............     155,411,000               --                155,411,000
Cost of Services:
  Health services ..........................      57,800,000               --                 57,800,000
  Managed care services ....................      65,937,000               --                 65,937,000
                                               -------------        -----------            -------------
        Total cost of services .............     123,737,000               --                123,737,000
                                               -------------        -----------            -------------
              Total gross profit ...........      31,674,000               --                 31,674,000
General and administrative expenses ........      14,420,000               --                 14,420,000
Amortization of intangibles ................       3,038,000               --                  3,038,000
                                               -------------        -----------            -------------
        Operating income ...................      14,216,000               --                 14,216,000
Interest expense ...........................       4,677,000         12,744,000(2)            17,421,000
Interest income ............................      (1,112,000)         1,112,000(9)                  --
Other, net .................................          98,000               --                     98,000
                                               -------------        -----------            -------------

        Income (loss) before income taxes ..      10,553,000        (13,856,000)              (3,303,000)
Provision (benefit) for income taxes .......       4,485,000         (5,392,000)(10)            (907,000)
                                               -------------        -----------            -------------
Net income (loss) from continuing operations      $6,068,000        $(8,464,000)             $(2,396,000)
                                               =============        ===========            =============
Basic earnings (loss) per share ............                              $0.13                   $(0.09)
                                               =============        ===========            =============
  Weighted average common shares outstanding      47,251,000        (21,613,000)(11)          25,638,000

Diluted earnings (loss) per share ..........                              $0.13                   $(0.09)
                                               =============        ===========            =============
  Weighted average common shares and
    equivalents outstanding ................      47,882,000        (22,244,000)(11)          25,638,000
</TABLE>




     See accompanying Notes to Consolidated Pro Forma Financial Statements.

                                       11
<PAGE>










                          CONCENTRA MANAGED CARE, INC.

                 Consolidated Pro Forma Statements of Operations
                For the Year Ended December 31, 1998 (Unaudited)
<TABLE>
<CAPTION>
                                                                     Pro Forma
                                                  Concentra          Adjustments           Pro Forma
                                                ------------        ------------          -----------
<S>                                              <C>               <C>                    <C>
Revenues:
  Health services ...........................    $259,481,000         $    --              $259,481,000
  Managed care services:
    Specialized cost containment ............     183,734,000              --               183,734,000
    Field case management ...................     167,841,000              --               167,841,000
                                                -------------     -------------           -------------
        Total managed care services .........     351,575,000              --               351,575,000
                                                -------------     -------------           -------------
            Total revenues ..................     611,056,000              --               611,056,000
Cost of Services:
  Health services ...........................     201,181,000              --               201,181,000
  Managed care services .....................     268,116,000              --               268,116,000
                                                -------------     -------------           -------------
        Total cost of services ..............     469,297,000              --               469,297,000
                                                -------------     -------------           -------------
            Total gross profit ..............     141,759,000              --               141,759,000
General and administrative expenses .........      45,326,000              --                45,326,000
Amortization of intangibles .................       8,119,000              --                 8,119,000
Non-recurring charge ........................      33,114,000              --                33,114,000
                                                -------------     -------------           -------------
            Operating income ................      55,200,000              --                55,200,000
Interest expense ............................      18,021,000        51,188,000(2)           69,209,000
Interest income .............................      (4,659,000)        4,659,000(9)                 --
Other, net ..................................          44,000              --                    44,000
                                                -------------     -------------           -------------

            Income (loss) before income taxes      41,794,000       (55,847,000)            (14,053,000)
Provision (benefit) for income taxes ........      19,308,000       (21,181,000)(10)         (1,873,000)
                                                -------------     -------------           -------------
Net income (loss) from continuing operations      $22,486,000      $(34,666,000)           $(12,180,000)
                                                =============     =============           =============

Basic earnings (loss) per share .............                             $0.48                  $(0.48)
                                                                  =============           =============
  Weighted Average Common Shares Outstanding       46,451,000       (20,813,000)(11)         25,638,000


Diluted earnings (loss) per share ...........                             $0.47                  $(0.48)
                                                =============     =============           =============
  Weighted average common shares and
    equivalents outstanding .................      47,827,000       (22,189,000)(11)         25,638,000

</TABLE>



     See accompanying Notes to Consolidated Pro Forma Financial Statements.


                                       12
<PAGE>

                          CONCENTRA MANAGED CARE, INC.

        Notes To Consolidated Pro Forma Financial Statements (Unaudited)

(1)   To record the equity contributions and the receipt of $230,269,000 of cash
      and  $34,500,000  of  Notes  by  WCAS,  $30,600,000  of  cash  by FFT  and
      $23,000,000 of cash by other investors.


(2)   The table  below  reflects  the pro forma  adjustments  to record  (i) the
      repayment or equity contribution of certain existing debt and the issuance
      of new  debt  associated  with  the  Merger,  (ii)  the  write-off  of the
      Company's  existing  deferred  finance  costs on debt to be repaid  and to
      record new  deferred  finance  costs  associated  with the issuance of new
      debt, and (iii) the related interest expense adjustment to reflect the pro
      forma effect of (i) and (ii) above.
<TABLE>
<CAPTION>
                                                                                               INTEREST
                                                                         INTEREST               EXPENSE
                                                            AMOUNT         RATE               ADJUSTMENT
                                                           -------     ----------             ----------
                                                                                    YEAR            THREE MONTHS
                                                                                    ENDED               ENDED
                                                                              DECEMBER 31, 1998    MARCH 31, 1999
                                                                              -----------------    --------------
                                                                           (DOLLARS IN THOUSANDS)
<S>                                                        <C>             <C>       <C>              <C>
Repayment or equity contribution of existing debt:
Commitment fees on existing Revolving
  Credit Facility ................................         $      --                 $    (250)       $      (63)
4.5% Notes .......................................          (230,000)      4.50%(a)     (8,165)           (2,587)
6.0% Notes                                                   (97,750)      6.00%        (5,865)           (1,466)
Interest on other indebtedness paid off during the year           --                    (2,042)              (62)
                                                           ---------                 ---------        ----------
        Total existing debt .....................           (327,750)                  (16,322)           (4,178)
        Equity contribution of Notes by WCAS ....            (34,500)
                                                           ---------
        Total repayment of existing debt.........          $(293,250)
                                                           =========

Issuance of new debt:
Term Facilities:
  Commitment fee on new $100,000,000 Credit Facility      $      --                        500               125
  Tranche B at ABR plus applicable margin due 2006.....      250,000       8.25%(b)     20,625             5,157
  Tranche C at ABR plus applicable margin due 2007.....      125,000       8.50%(b)     10,625             2,656
Senior Subordinated Notes at 10.75% due 2009...........      190,000      10.75%        20,425             5,106
Senior Discount Notes with warrants at
  13.75% due 2010(c)                                          86,058      16.63%(c)     14,908             3,846
                                                           ---------                ----------        ----------
                                                             651,058                    67,083            16,890
Warrants to purchase Company Common Stock(c)                  23,942
                                                           ---------
                                                           $ 675,000
                                                           =========
Amortization of existing deferred finance
  costs on debt being repaid:
        December 31, 1998 ...........................     $   (7,592)                   (1,699)
        March 31, 1999 ..............................         (7,093)                                       (499)
Amortization of deferred finance costs on new debt ..         17,500(d)                  2,126               532
                                                                                    ----------        ----------
        Total interest expense adjustment...........                                $   51,188        $   12,744
                                                                                    ==========        ==========
</TABLE>

    (a)   The 4.5%  Notes  were  issued  in  March  ($200,000,000)  and  April
          ($30,000,000)  of  1998.  As such,  the  interest  expense  does not
          reflect a full year of interest expense.
    (b)   The  Adjusted  Borrowing  Rate  ("ABR")  is assumed to be 5% for the
          purposes of  calculating  interest  expense.  The annual effect of a
          1/8% change in the interest rate on the  $375,000,000  variable rate
          debt is $469,000  for the year ended  December 31, 1998 and $117,000
          for the three months ended March 31, 1999.
    (c)   Reflects  $110,000,000  Senior  Discount Notes less debt discount of
          $23,942,000  which is the value assigned to the detachable  warrants
          for the purchase of 1,451,000  shares of Company  Common Stock at an
          exercise  price of $0.01 per share.  The effective  interest rate is
          16.63%.
    (d)   The  estimated  deferred  finance  fees  of  $17,500,000  are  being
          amortized  over  the  weighted  average  life of the new debt of 8.7
          years.

                                       13

<PAGE>

(3)  To reflect the  repurchase of 41,154,817  shares of Company Common Stock by
     the Company at $16.50 per share.  These shares are  comprised of 47,303,020
     shares  outstanding  at March 31, 1999 plus  195,000  shares of  restricted
     stock vested and issued at the time of Merger,  less the  6,343,203  shares
     owned by WCAS prior to the Merger (see note 6).

(4)  To record the use of cash to fund approximately  $44,000,000 of transaction
     fees consisting of deferred finance costs of approximately $17,500,000 (see
     note 2(d)) and  banking,  professional  fees and other fees of  $26,500,000
     associated with the Merger, which will be expensed. The expensed portion of
     the fees of  $26,500,000  has not been  reflected on the  Consolidated  Pro
     Forma Statement of Operations, as they are one-time and unusual in nature.

(5)  To  record  the  tax  benefit  ($4,227,000)  on the pro  forma  adjustments
     associated with the write-off of the existing  deferred  finance costs (see
     note 2) and the vesting and issuance of restricted stock as a result of the
     merger.  For  the  purposes  of  these  consolidated  pro  forma  financial
     statements,  the Company has assumed that none of the  expensed  portion of
     the transaction fees of $26,500,000 will be deductible for tax purposes.

(6)  To record the capital  contribution of cash and Notes of $318,369,000  (see
     note 1) and 6,343,203  shares of Company Common Stock owned by WCAS.  WCAS,
     FFT and other investors will own 22,389,824,  (87.3%), 1,854,545 (7.2%) and
     1,393,939 (5.5%) shares of Company Common Stock post-Merger, respectively.

(7)  To retire the Company's outstanding common stock at the time of the Merger.
     The value of the  treasury  stock of  $783,717,000  exceeds  the  Company's
     required stated capital and paid-in  capital by $59,318,000  which has been
     reflected as an increase to the Company's retained deficit.

(8)  To reflect  6,343,203  shares of Company Common Stock owned by WCAS,  which
     will be contributed to capital and will be subsequently retired at the time
     of the Merger. (9) To record the decrease in interest income due to the use
     of available cash. (10) To record the tax benefit on the pro forma interest
     adjustments  at 37.9%,  for the year ended  December 31, 1998 and 38.9% for
     the three months ended March 31, 1999.

(11)  To  retire  the  Company's   outstanding  common  stock  and  reflect  the
      subsequent  re-issuance of new Company Common Stock to WCAS, FFT and other
      investors in connection  with the Merger.  The Merger  Agreement  provides
      that the Company will use its best efforts to effect the  cancellation  or
      amendment  at the  Effective  Time of all  outstanding  options to acquire
      Company  Common Stock in exchange  for a cash payment  equal to $16.50 per
      share to such holder less the exercise price per share of such option. The
      Company has not yet developed a plan with regard to unvested  options.  If
      all  vested  in-the-money  (exercise  price  less than  $16.50  per share)
      options and  warrants are  exercised  at the time of the Merger,  the cash
      proceeds from the exercise  would be  $9,649,000,  the related tax benefit
      would be $5,078,000,  cash required to repurchase the  outstanding  shares
      would  be  $23,934,000  and   stockholders'   deficit  would  increase  to
      ($127,020,000).  The  settlement of the vested  in-the-money  options will
      result in a non-cash compensation charge of approximately $12,400,000.  As
      the exercise of these  options and warrants are not directly  attributable
      to the  Merger,  their  exercise  and  resulting  repurchase  has not been
      reflected  as a  pro  forma  adjustment  in  the  consolidated  pro  forma
      financial statements.


                                       14

<PAGE>

                            CONDITIONS OF THE OFFERS

        Notwithstanding  any other  provisions of this Offer to Purchase and the
accompanying Letter of Transmittal,  with respect to each issue of Notes and the
Offer  applicable to that issue,  the Company will not be required to accept for
purchase,  or to pay  for,  Notes  tendered  pursuant  to  such  Offer  and  may
terminate,  extend or amend such Offer and may,  subject to Rule 14e-l under the
Exchange Act, postpone the acceptance for purchase of, and payment for, Notes of
that issue so tendered, if the Merger Condition or any of the General Conditions
have  not  been  satisfied.  See  "Purpose  and  Background  of the  Offers--The
Merger--Conditions."

        The "General  Conditions"  shall be deemed to have been  satisfied  with
respect to a particular Offer unless any of the following conditions shall occur
on or after the date of this Offer to Purchase and prior to the  acceptance  for
purchase of any Notes tendered pursuant to the applicable Offer:

                  (a) there shall have been  threatened,  instituted  or pending
            any action,  proceeding,  claim or counterclaim by any government or
            governmental,  regulatory or  administrative  agency or authority or
            tribunal or any other  person,  domestic  or foreign,  or before any
            court,  authority,  agency  or  tribunal  that,  in  the  reasonable
            judgment of the Company, (i) challenges the acquisition of either or
            both  issues of the Notes  pursuant  to the Offers or may  prohibit,
            prevent,  restrict,  limit or delay closing of either or both of the
            Offers or the  Merger  or  otherwise  in any  manner  relates  to or
            affects  the  Offers or the  Merger  or (ii)  would  materially  and
            adversely  affect  the  business,  condition  (financial  or other),
            income,  operations  or  prospects  of  the  Company  or  any of its
            subsidiaries,  in each  case  taken as a whole,  or would  otherwise
            materially impair in any way the contemplated  future conduct of the
            business  of the  Company or any of its  subsidiaries,  in each case
            taken  as a whole,  or  would  materially  impair  the  contemplated
            benefits of any of the Offers to the Company,  other than any of the
            foregoing  events that has occurred  prior to the date of this Offer
            to Purchase or, in the case of any of the foregoing  events that has
            occurred  prior to the date of this Offer to  Purchase,  there shall
            have occurred any  development  that, in the reasonable  judgment of
            the Company, would or could have any of the effects set forth above;

                  (b) there  shall have been any action  threatened,  pending or
            taken,  or approval  withheld,  or any  statute,  rule,  regulation,
            judgment,   order  or  injunction  threatened,   proposed,   sought,
            promulgated,  enacted,  entered,  amended,  enforced or deemed to be
            applicable  to the  Offers,  the  Merger,  the Company or any of its
            subsidiaries,  by any legislative body, court, authority,  agency or
            tribunal which, in the reasonable judgment of the Company,  would or
            might, directly or indirectly,  (i) make the acceptance for purchase
            of, or payment  for,  some or all of the Notes  illegal or otherwise
            restrict or prohibit  closing of either or both of the Offers or the
            Merger, (ii) delay or restrict the ability of the Company, or render
            the Company unable, to accept for purchase or pay for some or all of
            the  Notes,  (iii)  otherwise  materially  impair  the  contemplated
            benefits  of the  Offers  to the  Company  or  (iv)  materially  and
            adversely  affect  the  business,  condition  (financial  or other),
            income,  operations  or  prospects  of  the  Company  or  any of its
            subsidiaries, in each case taken as a whole, or otherwise materially
            impair in any way the contemplated future conduct of the business of
            the  Company  or any of its  subsidiaries,  in each case  taken as a
            whole;

                  (c) there shall have  occurred (i) any general  suspension  of
            trading in, or limitation on prices for,  securities on any national
            securities  exchange  or in the  over-the-counter  market,  (ii) any
            change  (or  any  condition,   event  or  development   involving  a
            prospective  change) in the general political,  market,  economic or
            financial  condition  in the United  States or abroad  that,  in the
            reasonable  judgment of the Company,  could have a material  adverse
            effect on the  business,  condition  (financial  or other),  income,
            operations  or prospects of the Company or any of its  subsidiaries,
            in each case taken as a whole,  or the  ability to obtain  financing
            generally  or the  trading in the Notes or could or might  prohibit,
            restrict  or delay  closing  of,  or have an  adverse  effect on the
            contemplated  benefits  to the  Company of the Offers or the Merger,
            (iii) the  declaration of a banking  moratorium or any suspension of
            payments  in respect of banks in the United  States or abroad or any
            limitation on, or any event which, in the reasonable judgment of the
            Company,   might   affect,   the  extension  of  credit  by  lending
            institutions  or the public or private capital markets in the United
            States or abroad,  (iv) the commencement of a war, armed hostilities
            or other  international or national  calamity directly or indirectly
            involving  the  United  States  or  (v) in  the  case  of any of the
            foregoing existing at the time of the commencement of the Offers, in
            the reasonable  judgment of the Company, a material  acceleration or
            worsening thereof;

                  (d) there  shall have  occurred  any event or events that have
            resulted,  or may in the reasonable  judgment of the Company result,
            in an  actual  or  threatened  change  in  the  business,  condition
            (financial or other), income, operations or prospects of the Company
            or any of its subsidiaries, in each case taken as a whole;

                                       15
<PAGE>

                  (e) the Trustee under either  Indenture shall have objected in
            any  respect to or taken any action that  could,  in the  reasonable
            judgment of the Company,  adversely affect the closing of the Offers
            or shall have taken any  action  that  challenges  the  validity  or
            effectiveness of the procedures used by the Company in the making of
            the Offers or the acceptance for purchase of, or payment for, any of
            the Notes; or

                  (f) there exists,  in the reasonable  judgment of the Company,
            any other actual or threatened legal impediment (including a default
            under  an  agreement,   indenture,  lease  or  other  instrument  or
            obligation  to or by which the  Company  or any of their  respective
            subsidiaries,   including   their   respective   subsidiaries   upon
            consummation  of  the  Merger,  is a  party  or  is  bound)  to  the
            acceptance  for purchase of, or payment for, any of the Notes or the
            implementation or validity of the Offers.

               The  conditions to each of the Offers are for the sole benefit of
the  Company  and may be asserted  with  respect to either  Offer by the Company
regardless of the circumstances (including any action or inaction by the Company
giving rise to any such condition),  and any such condition may be waived by the
Company,  in  whole  or in  part,  at any  time  and  from  time  to time in its
reasonable discretion.  The Company also reserves the right at any time to waive
any or all of such  conditions  as to one of the Offers  but not the other.  The
failure by the Company at any time to exercise any of the foregoing rights shall
not be deemed a waiver of any such right, and each such right shall be deemed an
ongoing  right  which may be  asserted  at any time and from  time to time.  Any
determination by the Company concerning the events described above will be final
and binding on all parties.

        The Company  reserves the right to transfer or assign from time to time,
in whole or in part,  to one or more  persons,  its right to purchase  the Notes
tendered  pursuant to either of the Offers,  but any such transfer or assignment
will not relieve the Company of its  obligations  under the Offers or  prejudice
the rights of tendering  Holders to receive  payment for Notes validly  tendered
and accepted for purchase pursuant to the Offers.

               EXPIRATION TIME; EXTENSION; AMENDMENT; TERMINATION

        Each of the  Offers  will  expire at 5:00 p.m.,  New York City time,  on
Tuesday,  August 17, 1999, unless extended by the Company in its sole discretion
or terminated earlier. The Company expressly reserves the right to extend either
or both of the Offers on a daily  basis or for such  period or periods as it may
determine  in its sole  discretion  from time to time by giving  written or oral
notice to the Depositary and by making an  announcement  by press release to the
Dow Jones News Service or other public announcement prior to 9:00 a.m., New York
City time, on the next business day following the relevant previously  scheduled
Expiration Time for such extended Offer.  During any extension of an Offer,  all
Notes  previously  tendered  and not  withdrawn  pursuant  to that Offer and not
accepted for purchase will remain subject to that Offer and may,  subject to the
terms and  conditions of this Offer to Purchase and the  accompanying  Letter of
Transmittal,  be accepted for purchase by the Company.  It is contemplated  that
the Expiration Time for the Offers will be extended,  if necessary,  to coincide
with the Closing Date.

        With respect to each Offer, the Company expressly  reserves the absolute
right, in its sole discretion, to (i) amend or modify any or all of the terms of
that Offer, (ii) modify the Purchase Price or (iii) if any of the conditions set
forth under  "Conditions of the Offers" above are not satisfied or waived by the
Company, to terminate the applicable Offer and not accept for purchase the Notes
tendered  pursuant  thereto or to delay  acceptance  for purchase of, or payment
for,  the  Notes  tendered  pursuant  thereto.  In no event,  however,  will the
Purchase  Price for an issue of Notes be  modified  once any of such  Notes have
been accepted by the Company for  purchase,  regardless of whether the Offer for
such Notes is continuing.  Any waiver or amendment to an Offer will apply to all
Notes tendered of the relevant  issue,  regardless of when or in what order such
Notes were  tendered.  The Company also  reserves the right at any time to waive
any or all of such  conditions as to one but not the other of the Offers,  or to
modify the terms or Purchase  Price of or to terminate  one but not the other of
the Offers  without so  modifying or  terminating  the other.  Any  amendment or
termination  of either  Offer will be followed as  promptly  as  practicable  by
public  announcement  thereof.  The Company will have no  obligation to publish,
advertise or otherwise  communicate any such public  announcement  other than by
making a release to the Dow Jones News Service.

        If any material  change  occurs in the  information  published,  sent or
given to the Holders or the Company makes a material  change in the terms of the
Offers or waives a material  condition of the Offers,  the Company will promptly
disclose  such  change and,  if  necessary,  will extend the Offers for a period
deemed  by  the  Company  to  be  adequate  under  the   applicable   facts  and
circumstances.  With respect to any change in the  consideration  offered by the
Company for the Notes or in the percentage of the Notes being sought, the Offers
will be extended for a minimum of ten  business  days after the date that notice
of such change is first published, sent or given to Holders.


                                       16
<PAGE>

               ACCEPTANCE OF NOTES FOR PURCHASE; PAYMENT FOR NOTES

        Upon the terms and subject to the  conditions  of this Offer to Purchase
and the  accompanying  Letter  of  Transmittal,  the  Company  will  accept  for
purchase,  and  promptly  pay for,  Notes  validly  tendered  (and  not  validly
withdrawn)  pursuant to an Offer (or defectively  tendered,  if any such defects
have been waived) after the later of (i) the  Expiration  Time of such Offer and
(ii) the  satisfaction or waiver of the conditions to such Offer specified above
under  "Conditions of the Offers." It is currently  expected that the Expiration
Time  will  occur  on the  Closing  Date and  that  the  date of  payment  for a
particular  issue of Notes will be the third  business day after the  applicable
Expiration Time. The Company reserves the right to accept one issue of Notes for
purchase without accepting for purchase Notes of the other issue.

        The Company  expressly  reserves the right, in its sole  discretion,  to
delay  acceptance  for purchase of the Notes  tendered under either Offer or the
payment  for Notes  accepted  for  purchase  (subject  to Rule  14e-l  under the
Exchange Act, which requires that the Company pay the  consideration  offered or
return the securities  deposited by or on behalf of the holders thereof promptly
after termination or withdrawal of a tender offer), or to terminate either Offer
and not accept for purchase any Notes not theretofore accepted for purchase,  if
any of the  conditions  set forth above under  "Conditions  of the Offers"  with
respect to that Offer shall not have been  satisfied or waived by the Company or
in order to comply in whole or in part with any applicable law. The Company also
expressly reserves the right at any time to delay acceptance for purchase of the
Notes subject to or to terminate one of the Offers without  delaying  acceptance
for purchase the Notes subject to or terminating the other Offer.

        In all cases,  payment for Notes  accepted for  purchase  pursuant to an
Offer will be made only after timely receipt by the  Depositary of  certificates
for the applicable  Notes (or confirmation of book-entry  transfer),  a properly
completed and duly executed Letter of Transmittal related thereto (or a manually
signed  facsimile) or, if applicable,  an Agent's  Message (as defined below) in
lieu of a Letter of Transmittal and any other documents required thereby.

        For purposes of each Offer,  the Company will be deemed to have accepted
for purchase Notes validly tendered (and not validly withdrawn) pursuant to that
Offer (or  defectively  tendered  Notes with  respect to which the  Company  has
waived any defects) if, as and when the Company gives oral notice  (confirmed in
writing) or written notice thereof to the Depositary. Payment for Notes accepted
for  purchase in the Offers  will be made by the Company by promptly  depositing
such  payment  with the  Depositary,  which will act as agent for the  tendering
Holders  for  the  purpose  of  receiving  the  relevant   Purchase   Price  and
transmitting  the relevant  Purchase  Price to such Holders.  Upon the terms and
subject to the  conditions  of the Offers,  delivery of the  Purchase  Price for
Notes  accepted  for  purchase  pursuant  to the  Offers  will  be  made  by the
Depositary promptly after its receipt of funds for the payment of such Notes.

        Tenders  of  Notes  pursuant  to the  Offers  will be  accepted  only in
principal amounts equal to $1,000 or any integral multiple thereof.

        If, for any reason,  acceptance  for  purchase of or payment for validly
tendered  Notes  pursuant to either Offer is delayed or the Company is unable to
accept for purchase or to pay for validly tendered Notes pursuant to that Offer,
then the Depositary may, nevertheless, on behalf of the Company, retain tendered
Notes,   without  prejudice  to  the  rights  of  the  Company  described  under
"Expiration  Time;  Extension;  Amendment;  Termination"  and "Conditions of the
Offers" above and  "Withdrawal  of Tenders;  Absence of Appraisal  Rights" below
(subject to Rule 14e-l under the Exchange Act).

        If tendered Notes are not accepted for purchase for any reason  pursuant
to the terms and  conditions  of this  Offer to  Purchase  and the  accompanying
Letter of  Transmittal,  or if  certificates  are  submitted for more Notes than
those which are tendered,  certificates for such Notes will be returned, without
expense,  to the  tendering  Holder  (or,  in the  case  of  Notes  tendered  by
book-entry  transfer into the  Depositary's  account at the Book-Entry  Transfer
Facility pursuant to the procedures set forth under the caption  "Procedures for
Tendering Notes -- Book-Entry  Transfer"  below,  such Notes will be credited to
the account  maintained at the Book-Entry  Transfer Facility) promptly following
the applicable  Expiration Time or the termination of the relevant Offer, unless
otherwise requested by such Holder under "Special Delivery  Instructions" in the
Letter of  Transmittal.  Although  it has no  obligation  to do so,  subject  to
applicable laws, the Company reserves the right in the future to seek to acquire
Notes not  tendered in the Offers by means of open market  purchases,  privately
negotiated  acquisitions,  subsequent exchange or tender offers,  redemptions or
otherwise,  at prices or on terms that may be more or less  favorable than those
in the Offers.

        Holders  whose Notes are tendered and accepted for purchase  pursuant to
the Offers will be entitled to accrued and unpaid interest on their Notes up to,
but not  including,  the  date of  payment.  UNDER  NO  CIRCUMSTANCES  WILL  ANY
ADDITIONAL INTEREST BE PAYABLE BECAUSE OF ANY DELAY IN THE TRANSMISSION OF FUNDS
TO THE HOLDERS OF PURCHASED NOTES OR OTHERWISE.


                                       17
<PAGE>

        Holders of Notes  purchased  in the Offers will not be  obligated to pay
brokerage  commissions,  fees or transfer  taxes with respect to the purchase of
their  Notes  except  as  described  in  the   Instructions  to  the  Letter  of
Transmittal.  The Company will pay all other  charges and expenses in connection
with the Offers. See "Information Agent, Dealer Manager and Depositary."

                         PROCEDURES FOR TENDERING NOTES

        PROPER TENDER OF NOTES

        For a Holder to validly  tender Notes  pursuant to the Offers,  (i) such
Notes  together  with a  properly  completed  and  validly  executed  Letter  of
Transmittal  (or a  manually  signed  facsimile),  together  with any  signature
guarantees and any other documents required by the instructions to the Letter of
Transmittal,  must be received by the Depositary at its address set forth on the
back  cover of this  Offer to  Purchase  or (ii)  such  Notes  must be  tendered
pursuant  to the  procedures  for  book-entry  transfer  described  below  and a
confirmation of such book-entry transfer must be received by the Depositary,  in
either case,  prior to the applicable  Expiration  Time. A Holder who desires to
tender  Notes  and who  cannot  do so on a timely  basis  must  comply  with the
procedures for guaranteed delivery set forth below.

        LETTERS OF TRANSMITTAL  AND NOTES SHOULD BE SENT ONLY TO THE DEPOSITARY,
AND NOT TO THE  COMPANY,  THE  INFORMATION  AGENT,  THE  DEALER  MANAGER  OR THE
BOOK-ENTRY TRANSFER FACILITY.

        DELIVERY OF LETTER OF TRANSMITTAL

        If  certificates  for Notes are registered in the name of a person other
than the signer of a Letter of Transmittal,  then, in order to tender such Notes
pursuant  to the  Offers,  the  certificates  for such Notes must be endorsed or
accompanied by appropriate  bond powers,  signed exactly as the name or names of
such Holder or Holders  appear on the  certificates,  with the signatures on the
certificates or bond powers guaranteed as provided below.

        A LETTER OF TRANSMITTAL (OR A MANUALLY SIGNED FACSIMILE) MUST BE USED TO
TENDER NOTES AS DESCRIBED IN THIS  SECTION.  HOLDERS WHO WISH TO TENDER NOTES OF
MORE THAN ONE ISSUE  MUST  COMPLETE A SEPARATE  LETTER OF  TRANSMITTAL  FOR EACH
ISSUE TENDERED.

        Any beneficial owner whose Notes are registered in the name of a broker,
dealer,  commercial  bank,  trust  company or other  nominee or held through the
Book-Entry  Transfer Facility and who wishes to tender Notes should contact such
registered  Holder promptly and instruct such registered  Holder to tender Notes
on such beneficial  owner's behalf according to one of the procedures  described
herein,  A Letter of  Instruction  is  contained in the  solicitation  materials
provided  along with this Offer to  Purchase  which may be used by a  beneficial
owner to instruct the record holder to tender Notes.

        SIGNATURE GUARANTEES

        Signatures  on the Letter of  Transmittal  must be  guaranteed by a firm
that is a participant in the Security  Transfer Agents Medallion  Program or the
Stock Exchange  Medallion  Program (an "Eligible  Institution"),  unless (a) the
Letter  of  Transmittal  is  signed  by the  registered  Holder(s)  of the Notes
tendered  therewith (or by a participant  in the  Book-Entry  Transfer  Facility
whose name  appears on a security  position  listing as the owner of such Notes)
and payment of the Purchase  Price is to be made,  or if any Notes for principal
amounts not tendered or not accepted for purchase are to be issued,  directly to
such  Holder(s)  (or, if tendered by a participant  in the  Book-Entry  Transfer
Facility,  any Notes for  principal  amounts not  tendered or not  accepted  for
purchase  are to be credited  to such  participant's  account at the  Book-Entry
Transfer Facility),  and neither the "Special Payment  Instructions" box nor the
"Special  Delivery  Instructions"  box on the  Letter  of  Transmittal  has been
completed,  or (b) such  Notes  are  tendered  for the  account  of an  Eligible
Institution.


                                       18
<PAGE>


        BOOK-ENTRY TRANSFER

        Promptly  after the  commencement  of the Offers,  the  Depositary  will
establish an account or use an existing account with respect to the Notes at the
Depository Trust Company (the "Book-Entry Transfer Facility"), and any financial
institution that is a participant in the Book-Entry Transfer Facility system and
whose name appears on a security position listing as the owner of Notes may make
book-entry  delivery of Notes by causing  the  Book-Entry  Transfer  Facility to
transfer  such  Notes  into the  Depositary's  account  in  accordance  with the
Book-Entry Transfer Facility's procedures for such transfer.  However,  although
delivery  of  Notes  may  be  effected  through  book-entry  transfer  into  the
Depositary's account as a book-entry  transfer,  the Letter of Transmittal (or a
manually signed facsimile),  properly  completed and validly executed,  with any
required  signature  guarantees or an Agent's Message (as defined below) in lieu
of the Letter of  Transmittal,  and any other required  documents,  must, in any
case,  be received by the  Depositary  at one of its  addresses set forth on the
back cover of this Offer to Purchase prior to the applicable  Expiration Time or
the guaranteed  delivery  procedures  described below must be complied with. The
confirmation of a book-entry transfer of Notes into the Depositary's  account at
the  Book-Entry  Transfer  Facility  is  referred  to  herein  as a  "Book-Entry
Confirmation."

        DELIVERY OF DOCUMENTS TO THE BOOK-ENTRY  TRANSFER FACILITY IN ACCORDANCE
WITH SUCH BOOK-ENTRY TRANSFER FACILITY'S PROCEDURES DOES NOT CONSTITUTE DELIVERY
TO THE DEPOSITARY.

        The term "Agent's Message" means a message transmitted by the Book-Entry
Transfer  Facility to, and received by, the  Depositary  and forming a part of a
Book-Entry Confirmation,  which states that the Book-Entry Transfer Facility has
received  an  express  acknowledgment  from the  participant  in the  Book-Entry
Transfer  Facility  tendering the Notes that such  participant  has received and
agrees  to be  bound by the  terms of the  Letter  of  Transmittal  and that the
Company may enforce such agreement against the participant.

        GUARANTEED DELIVERY

        If a Holder  desires  to tender  Notes  pursuant  to the  Offers and (a)
certificates for such Notes are not lost but are not immediately available,  (b)
time will not permit such Holder's Letter of Transmittal,  certificates for such
Notes and all other  required  documents  to reach the  Depositary  prior to the
Expiration  Time  or (c)  the  procedures  for  book-entry  transfer  cannot  be
completed prior to the applicable  Expiration  Time, a tender may be effected if
all of the following are complied with:

                  (a) such tender is made by or through an Eligible Institution;

                  (b)  on or  prior  to  the  applicable  Expiration  Time,  the
            Depositary  has received from such Eligible  Institution,  at one of
            the addresses of the  Depositary set forth on the back cover of this
            Offer to Purchase,  a properly completed and duly executed Notice of
            Guaranteed Delivery (by manually signed facsimile transmission, mail
            or hand delivery) in substantially the form provided with this Offer
            to  Purchase,  setting  forth the  name(s)  and  address(es)  of the
            registered  Holder(s)  and  the  principal  amount  of  Notes  being
            tendered,  and  stating  that the tender is being made  thereby  and
            guaranteeing  that,  within three New York Stock  Exchange  ("NYSE")
            trading  days after the date of the Notice of  Guaranteed  Delivery,
            the  applicable  Letter of Transmittal  properly  completed and duly
            executed   (or  a  manually   signed   facsimile),   together   with
            certificates for such Notes (or confirmation of book-entry  transfer
            of such  Notes into the  Depositary's  account  with the  Book-Entry
            Transfer Facility and, if applicable,  an Agent's Message in lieu of
            the Letter of Transmittal),  and any other documents required by the
            applicable Letter of Transmittal and the instruction  thereto,  will
            be deposited by such Eligible Institution with the Depositary; and

                  (c)  such  Letter  of  Transmittal   (or  a  manually   signed
            facsimile),  properly  completed and duly executed with any required
            signature guarantees,  together with certificates for all physically
            delivered  Notes in proper form for  transfer  (or  confirmation  of
            book-entry transfer of such Notes into the Depositary's account with
            the  Book-Entry  Transfer  Facility and, if  applicable,  an Agent's
            Message  in lieu  of the  Letter  of  Transmittal),  and  any  other
            required  documents are received by the Depositary within three NYSE
            trading days after the date of such Notice of Guaranteed Delivery.

        THE NOTICE OF GUARANTEED  DELIVERY MUST BE USED WITH RESPECT TO NOTES TO
BE DELIVERED BY  GUARANTEED  DELIVERY,  AND HOLDERS WHO WISH TO TENDER MORE THAN
ONE ISSUE OF NOTES PURSUANT TO THE PROCEDURES FOR GUARANTEED  DELIVERY DESCRIBED
ABOVE MUST COMPLETE A SEPARATE NOTICE OF GUARANTEED  DELIVERY IN RESPECT OF EACH
ISSUE OF NOTES TENDERED.


                                       19
<PAGE>


        LOST OR MISSING CERTIFICATES

        If a Holder  desires to tender  Notes  pursuant to the  Offers,  but the
certificates for such Notes have been mutilated, lost, stolen or destroyed, such
Holder  should  write to or  telephone  the  relevant  Trustee at the address or
telephone number listed below to obtain replacement  certificates for such Notes
or to arrange  for any other  matters  that  require  handling  by the  relevant
Trustee:

     FOR THE 6% NOTES:                         FOR THE 4.5% NOTES:

     United States Trust Company of New York   Chase Bank of Texas, N.A
     114 West 47th Street                      2200 Ross Avenue, 5th Floor
     New York, New York  10036-1532            Dallas, Texas  75201
     Attention:  Corporate Trust Division      Attention:  Global Trust Services
     Telephone:  (800) 548-6565                Telephone:  (800) 275-2048

        OTHER MATTERS

        THE  METHOD  OF  DELIVERY  TO THE  DEPOSITARY  OF NOTES AND  LETTERS  OF
TRANSMITTAL  (OR MANUALLY SIGNED  FACSIMILES)  AND ALL OTHER REQUIRED  DOCUMENTS
(INCLUDING THROUGH THE BOOK-ENTRY TRANSFER FACILITY) IS AT THE ELECTION AND RISK
OF THE HOLDER  TENDERING  NOTES.  DELIVERY OF SUCH DOCUMENTS WILL BE DEEMED MADE
ONLY WHEN ACTUALLY  RECEIVED BY THE DEPOSITARY.  IF SUCH DELIVERY IS BY MAIL, IT
IS SUGGESTED THAT THE HOLDER USE PROPERLY  INSURED,  REGISTERED MAIL WITH RETURN
RECEIPT  REQUESTED,  AND THAT THE MAILING BE MADE SUFFICIENTLY IN ADVANCE OF THE
APPLICABLE  EXPIRATION TIME TO PERMIT  DELIVERY TO THE DEPOSITARY  PRIOR TO SUCH
RESPECTIVE DATE. NO ALTERNATIVE, CONDITIONAL OR CONTINGENT TENDERS OF NOTES WILL
BE ACCEPTED.

        Notwithstanding  any other  provision  of this Offer to  Purchase or the
Letter of Transmittal,  payment for Notes accepted for purchase  pursuant to the
Offers will in all cases be made only after timely  receipt by the Depositary of
(a) certificates for (or a timely Book-Entry  Confirmation with respect to) such
Notes,  (b) a Letter of Transmittal (or a manually signed  facsimile),  properly
completed and duly executed, with any required signature guarantees,  or, in the
case of a  book-entry  transfer,  an  Agent's  Message  in lieu of the Letter of
Transmittal and (c) any other  documents  required by the Letter of Transmittal.
Accordingly,  tendering  Holders may be paid at different times,  depending upon
when certificates for Notes or Book-Entry Confirmation with respect to Notes and
other documents  required by the Letter of Transmittal are actually  received by
the Depositary.  Under no circumstances will additional  interest be paid on the
Purchase Price from the date of acceptance for payment,  regardless of any delay
in making such payment.

        Tenders of Notes pursuant to any of the procedures  described above, and
acceptance by the Company of Notes for purchase and payment,  will  constitute a
binding  agreement  between the Company and the tendering  Holder of such Notes,
upon the terms and subject to the  conditions  of this Offer to Purchase and the
accompanying Letter of Transmittal as are in effect at the applicable Expiration
Time.

        All  questions  as to  the  form  of  all  documents  and  the  validity
(including  time of receipt) and  acceptance of all tenders and  withdrawals  of
Notes  will  be  determined  by  the  Company,  in  its  sole  discretion,   the
determination of which shall be final and binding.  Alternative,  conditional or
contingent  tenders of Notes will not be considered  valid. The Company reserves
the absolute  right to reject any or all tenders of Notes that are not in proper
form or the acceptance of which in the Company's opinion, would be unlawful. The
Company  also  reserves the right to waive any defects or  irregularities  as to
particular Notes.

        The Company's  interpretation  of the terms and conditions of this Offer
to Purchase and the accompanying Letter of Transmittal, as such documents may be
amended or supplemented, will be final and binding.

        Any defect or  irregularity  in connection with tenders of Notes must be
cured within such time as the Company determines,  unless waived by the Company.
Tenders  of Notes  shall not be deemed to have been made until all  defects  and
irregularities  have been waived by the Company or cured.  None of the  Company,
the Depositary,  the Trustees,  the Information Agent, the Dealer Manager or any
other  person  will  be  under  any  duty  to  give  notice  of any  defects  or
irregularities  in tenders of Notes,  or will incur any liability to Holders for
failure to give any such notice.

        BACKUP WITHHOLDING

        For a discussion of U.S.  federal income tax  considerations  related to
back-up  withholding,  see "Certain Federal Income Tax  Considerations -- Backup
Withholding" below.

                                       20
<PAGE>

                             WITHDRAWAL OF TENDERS;
                           ABSENCE OF APPRAISAL RIGHTS

        WITHDRAWAL OF TENDERS

        Tenders of Notes of either  issue may be validly  withdrawn  at any time
prior to the  relevant  Expiration  Time and,  unless  theretofore  accepted for
payment by the  Company  pursuant  to the  relevant  Offer,  may also be validly
withdrawn  at any time after  Tuesday,  September  14,  1999.  Holders  who have
withdrawn  tenders  of  Notes  may  re-tender  Notes  by  following  one  of the
procedures described in "Procedures for Tendering Notes."

        Holders who wish to exercise  their right of withdrawal  with respect to
an Offer must give written notice of withdrawal delivered by mail, hand delivery
or manually signed facsimile transmission,  which notice must be timely received
by the  Depositary  at one of its  addresses set forth on the back cover of this
Offer to Purchase. In order to be valid, a notice of withdrawal must (i) specify
the  name  of  the  person  who  deposited  the  Notes  to  be  withdrawn   (the
"Depositor"),  the name in which the Notes are  registered  (or,  if tendered by
book-entry  transfer,  the name of the  participant in the  Book-Entry  Transfer
Facility whose name appears on a security  position listing as the owner of such
Notes),  if different  from that of the  Depositor,  (ii) specify the  principal
amount of Notes to be  withdrawn,  (iii) be signed by the  Depositor in the same
manner as the original signature on the Letter of Transmittal (including, in any
case,  any  required  signature  guarantee(s))  or be  accompanied  by  evidence
satisfactory to the Company and the Depositary  that the person  withdrawing the
tender  has  succeeded  to the  beneficial  ownership  of such Notes and (iv) be
timely  received by the Depositary at one of its addresses set forth on the back
cover of this  Offer  to  Purchase.  If  certificates  have  been  delivered  or
otherwise identified (through confirmation of book-entry transfer of such Notes)
to the Depositary,  the name of the Holder and the certificate number or numbers
relating to such  withdrawn  Notes must also be furnished to the  Depositary  as
aforesaid prior to the physical  release of the  certificates  for the withdrawn
Notes (or, in the case of Notes transferred by book-entry transfer, the name and
number of the account at the  Book-Entry  Transfer  Facility to be credited with
withdrawn Notes).

        APPRAISAL RIGHTS

        The Notes are debt  obligations  of the Company and are  governed by the
Indentures.  There are no appraisal or other similar  statutory rights available
to Holders in connection with the Offers.

                           SOURCE AND AMOUNT OF FUNDS

        The total amount of funds required by the Company to purchase all of the
Notes pursuant to the Offers and pay all related costs and expenses is estimated
to be  approximately  $333,854,000.  The  Company  intends  to cancel  the Notes
acquired  pursuant to the Offers in  accordance  with the terms of the  relevant
Indenture.

        The Company expects to finance the aggregate Purchase Price of the Notes
with cash available from the Company's cash reserves,  the Capital Contributions
and the New  Financing  immediately  following  the  Merger  (see  "Purpose  and
Background  of the  Offers  -- The  Merger").  There  are no  current  plans  to
refinance any borrowings included in the New Financing.

                    CERTAIN FEDERAL INCOME TAX CONSIDERATIONS

        The following discussion is for general information only and is based on
the U.S.  federal  income  tax law now in  effect,  which is  subject to change,
possibly  retroactively.  This  summary  does not  discuss  all  aspects of U.S.
federal income taxation that may be important to a particular Holder in light of
the Holder's individual investment  circumstances or to certain types of Holders
subject to special  tax rules  (e.g.,  financial  institutions,  broker-dealers,
insurance companies,  tax-exempt organizations and foreign taxpayers),  nor does
it address  specific  state,  local or foreign tax  consequences.  This  summary
assumes that Holders hold their Notes as "capital assets"  (generally,  property
held for investment)  under the Internal Revenue Code of 1986, as amended.  Each
Holder is urged to consult  its tax  advisor  regarding  the  specific  federal,
state, local and foreign income and other tax consequences of the Offers.

        TENDER OF NOTES PURSUANT TO THE OFFER

        The receipt of the Purchase  Price for Notes pursuant to the Offers will
be a taxable transaction for federal income tax purposes.  Accordingly, a Holder
will  recognize  gain or loss for U.S.  federal income tax purposes equal to the
difference between the amount of the Purchase Price received in exchange for its
Notes  (reduced  by amounts  attributable  to accrued  and unpaid  interest  not
previously included in income,  which will be treated as ordinary income for tax
purposes)  and such  Holder's  adjusted tax basis in such Notes.

                                       21
<PAGE>

Subject to the market  discount  rules and the bond  premium  rules,  a Holder's
adjusted tax basis in its Notes will generally be equal to its initial tax basis
at the time the Notes were  acquired by the Holder (i.e.,  its cost).  Except to
the extent of accrued market discount  (discussed below), if any, not previously
included in income,  any gain  recognized  with respect to a disposition  of the
Notes  will be  capital  gain.  Any  loss  will be a  capital  loss  under  such
circumstances.

        An exception to the capital gain treatment  described above may apply to
a Holder who purchased a Note at a "market  discount." The market  discount on a
Note is the excess of the stated  redemption price at maturity of such Note over
the Holder's tax basis in such Note  immediately  after its  acquisition by such
Holder,  subject  to a de minimis  exception  under  which  market  discount  is
considered  to be zero if it is less  than one  quarter  of one  percent  of the
stated  redemption price at maturity  multiplied by the number of complete years
to maturity from the date of acquisition.  In general, for a Holder that has not
elected to include market discount in income  currently as it accrues,  any gain
realized  on the  sale of a Note  having  market  discount  will be  treated  as
ordinary  income to the extent of the market  discount  that has  accrued  (on a
straight  line basis or, at the  election  of the  Holder,  on a constant  yield
basis) while such Note was held by the Holder.

        CONSEQUENCES TO NON-TENDERING HOLDERS

        Holders who do not tender  their Notes in the Offers will not  recognize
any gain or loss for federal  income tax purposes with respect to the Notes as a
result of the Offers.

        BACKUP WITHHOLDING

        Under federal income tax law,  certain  Holders whose Notes are accepted
for purchase are required to comply with applicable  certification  requirements
to avoid  imposition of backup  withholding at a rate of 31%. See "Important Tax
Information" in the Letter of Transmittal.

                INFORMATION AGENT, DEALER MANAGER AND DEPOSITARY

        The Company has retained MacKenzie Partners,  Inc. to act as Information
Agent,  Donaldson,  Lufkin & Jenrette  Securities  Corporation  to act as Dealer
Manager and United  States  Trust  Company of New York to act as  Depositary  in
connection with the Offers.  The Company has agreed to pay the Information Agent
and the  Depositary  customary  fees for their  services in connection  with the
Offers.  The Company has also agreed to reimburse  the  Information  Agent,  the
Dealer Manager and the Depositary for their  out-of-pocket  expenses  (including
the fees and  disbursements  of counsel) and to indemnify  them against  certain
liabilities,  including  liabilities  under the  federal  securities  laws.  The
Company  will not pay any fees or  commissions  to any  broker,  dealer or other
person (other than the Information  Agent and the Depositary) in connection with
the solicitation of tenders of Notes pursuant to the Offers.

        None of the  Information  Agent,  the Dealer  Manager or the  Depositary
assumes any  responsibility  for the accuracy or completeness of the information
concerning the Company  contained or  incorporated by reference in this Offer to
Purchase or for any  failure by the  Company to disclose  events that may affect
the significance or accuracy of such information.

        Directors,  officers  and  regular  employees  of the  Company  and  its
affiliates  (who will not be specifically  compensated  for such services),  the
Information  Agent and the Dealer Manager may contact  Holders  personally or by
mail,  telephone  or  otherwise  regarding  the Offers and may request  brokers,
dealers  and other  nominees  to forward  this  Offer to  Purchase  and  related
material to beneficial owners of Notes.

                                  MISCELLANEOUS

        The  Company  is not aware of any  jurisdiction  where the making of the
Offers is not in compliance with the laws of such  jurisdiction.  If the Company
becomes aware of any jurisdiction where the making of the Offers would not be in
compliance  with such laws,  the Company will make a good faith effort to comply
with  any such  laws or seek to have  such  laws  declared  inapplicable  to the
Offers.  If, after such good faith  effort,  the Company  cannot comply with any
such  applicable  laws,  the  Offers  will not be made to (nor will  tenders  be
accepted from or on behalf of) any Holders residing in such jurisdiction.


                                       22
<PAGE>

                        THE DEPOSITARY FOR THE OFFERS IS:

                     UNITED STATES TRUST COMPANY OF NEW YORK

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


                             BY OVERNIGHT COURIER &
                             BY HAND AFTER 4:30 P.M.
                    ON THE DATE OF THE EXPIRATION TIME ONLY:

                           United States Trust Company
                                   of New York
                            770 Broadway, 13th Floor
                               New York, NY 10003
                         Attn: Corporate Trust Services


                            BY HAND UP TO 4:30 P.M.:


                           United States Trust Company
                                   of New York
                                  111 Broadway
                                   Lower Level
                         Attn: Corporate Trust Services
                                NewYork, NY 10006

                              BY: FACSIMILE NUMBER:
                                  212-420-6211

                          CONFIRM BY TELEPHONE NUMBER:
                                  800-548-6565



                        BY REGISTERED OR CERTIFIED MAIL:



                           United States Trust Company
                                   of New York
                                  P.O. Box 844
                         Attn: Corporate Trust Services
                                 Cooper Station
                             New York, NY 10276-0844








        Any  questions  or  requests  for  assistance  may  be  directed  to the
Information  Agent or the  Dealer  Manager  at their  respective  addresses  and
telephone numbers set forth below.  Requests for additional copies of this Offer
to Purchase, the Letter of Transmittal and the Notice of Guaranteed Delivery may
be directed to the Information  Agent.  Requests for copies of the  Incorporated
Documents  and the  Indentures  may also be directed to the  Information  Agent.
Beneficial  owners may also contact their  broker,  dealer,  commercial  bank or
trust company for assistance concerning the Offers.

                    THE INFORMATION AGENT FOR THE OFFERS IS:

                            [MacKenzie Partners Logo]

                                156 Fifth Avenue
                            New York, New York 10010
                           212-929-5500 (Call Collect)
                                       or
                         (800) 322-2885 (Call Toll Free)

                      THE DEALER MANAGER FOR THE OFFERS IS:

                          DONALDSON, LUFKIN & JENRETTE

                                 277 Park Avenue
                            New York, New York 10172
                   (800) 255-9260, ext. 4131 (Call Toll Free)


                              LETTER OF TRANSMITTAL
                          TO TENDER (CHECK ONLY ONE*):


                  [] 6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
                              CUSIP #: 20589T-AA-1
                                       674623-AA-1 (FORMERLY OCCUSYSTEMS, INC.)
                 [] 4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003
                              CUSIP #: 20589T-AB-9
                                       20589T-AC-7
                                       OF
                          CONCENTRA MANAGED CARE, INC.
                        PURSUANT TO THE OFFER TO PURCHASE
                               DATED JULY 20, 1999

                EACH OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON
      TUESDAY, AUGUST 17, 1999 UNLESS EXTENDED OR TERMINATED (SUCH TIME AND
      DATE OR THE LATEST TIME AND DATE TO WHICH THE  RELEVANT  OFFER MAY BE
      EXTENDED OR  TERMINATED  WITH  RESPECT TO EACH OF THE  OFFERS,  BEING
      REFERRED TO HEREIN AS THE "EXPIRATION  TIME").  HOLDERS OF NOTES MUST
      TENDER THEIR NOTES PRIOR TO THE APPLICABLE EXPIRATION TIME TO RECEIVE
      THE APPLICABLE  PURCHASE PRICE (AS DEFINED  BELOW).  TENDERS OF NOTES
      MAY BE VALIDLY  WITHDRAWN  AT ANY TIME PRIOR TO THE  EXPIRATION  TIME
      AND, UNLESS THERETOFORE  ACCEPTED FOR PAYMENT BY THE COMPANY PURSUANT
      TO THE  RELEVANT  OFFER,  MAY ALSO BE VALIDLY  WITHDRAWN  AT ANY TIME
      AFTER TUESDAY, SEPTEMBER 14, 1999.


                        THE DEPOSITARY FOR THE OFFERS IS:
                     UNITED STATES TRUST COMPANY OF NEW YORK
                        --------------------------------

<TABLE>
<S>                                                  <C>                                        <C>
           BY OVERNIGHT COURIER &                      BY HAND UP TO 4:30 P.M.                  BY REGISTERED OR CERTIFIED MAIL:
           BY HAND AFTER 4:30 P.M.
  ON THE DATE OF THE EXPIRATION TIME ONLY:

         United States Trust Company                 United States Trust Company                  United States Trust Company
                 of New York                                 of New York                                  of New York
          770 Broadway, 13th Floor                          111 Broadway                                 P.O. Box 844
             New York, NY 10003                              Lower Level                        Attn: Corporate Trust Services
       Attn: Corporate Trust Services              Attn: Corporate Trust Services                       Cooper Station
                                                         New York, NY 10006                         New York, NY 10276-0844

                                                       By: Facsimile Number:
                                                            212-420-6211

                                                      Confirm by Telephone Number:
                                                            800-548-6565
</TABLE>


    DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS, OR TRANSMISSION VIA
 FACSIMILE, OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY.

              The instructions  contained herein should be read carefully before
this Letter of Transmittal is completed.

              This Letter of Transmittal and instructions hereto (the "Letter of
     Transmittal") and the Offer to Purchase, dated July 20, 1999 (as amended or
     supplemented from time to time, the "Offer to Purchase"), of Concentra

- -------------------------------------------------------------------------------
*  If Notes of more than one issue are being tendered,  it is necessary toreturn
   a separate form for eachissue of Notes.  Please check the  appropriate box at
   the top of this page to  indicate  the issue of Notes to which this Letter of
   Transmittal applies.

<PAGE>


Managed Care, Inc., a Delaware corporation (the "Company"),  together constitute
the  Company's  offer  to  purchase  for  cash  (i)  all of its  outstanding  6%
Convertible  Subordinated  Notes due 2001 (the "6% Notes")  for a cash  purchase
price of $1,002.50 per $1000  principal  amount of 6.0% Notes,  plus accrued and
unpaid  interest  up to, but not  including,  the date of  payment  and (ii) all
outstanding 4.5% Convertible  Subordinated Notes due 2003 (the "4.5% Notes" and,
together with the 6% Notes,  the "Notes") for a cash purchase price of $1,001.25
per $1000  principal  amount of 4.5% Notes,  plus accrued and unpaid interest up
to, but not including,  the date of payment (the "4.5% Note Purchase Price" and,
together  with the 6%  Purchase  Price,  the  "Purchase  Prices").  The offer to
purchase  each  issue of Notes on the terms and  subject to the  conditions  set
forth in the Offer to Purchase and in this Letter of  Transmittal is referred to
individually as an "Offer," and such offers with respect to both issues of Notes
are collectively referred to as the "Offers."

        HOLDERS WHO WISH TO BE ELIGIBLE TO RECEIVE THE APPLICABLE PURCHASE PRICE
PURSUANT TO AN OFFER MUST VALIDLY  TENDER (AND NOT WITHDRAW)  THEIR NOTES TO THE
DEPOSITARY PRIOR TO THE EXPIRATION TIME.

        This Letter of Transmittal is to be used by Holders if: (i) certificates
for Notes are to be  physically  delivered  to the  Depositary  herewith by such
Holders;  (ii) the tender of Notes is to be made by  book-entry  transfer to the
Depositary's  account at the Depository Trust Company (the "Book-Entry  Transfer
Facility")  pursuant to the  procedures set forth in the Offer to Purchase under
the caption  "Procedures  for  Tendering  Notes --  Book-Entry  Transfer" by any
financial  institution that is a participant in the Book-Entry Transfer Facility
and whose name appears on a security  position listing as the owner of the Notes
(such  participants,  acting on behalf of  Holders,  are  referred  to herein as
"Acting Holders") and an Agent's Message (as defined herein) is not delivered or
(iii) the tender of Notes is to be made  according  to the  guaranteed  delivery
procedures set forth in the Offer to Purchase under the caption  "Procedures for
Tendering Notes -- Guaranteed Delivery." Delivery of documents to the Book-Entry
Transfer Facility does not constitute delivery to the Depositary.

        In the event that an Offer is terminated or otherwise not completed, the
applicable  Purchase  Price will not be paid or become payable to Holders of the
Notes who have validly tendered their Notes pursuant to the applicable Offer.

        The Offers are made upon the terms and  subject  to the  conditions  set
forth in the Offer to Purchase and this Letter of  Transmittal.  Holders  should
carefully  review the  information  in the Offer to Purchase  and this Letter of
Transmittal. All capitalized terms used and not defined herein have the meanings
ascribed to them in the Offer to Purchase.

        A  Holder's  bank or broker  can assist in  completing  this  form.  The
instructions  included  with  this  Letter  of  Transmittal  must  be  followed.
Questions and requests for assistance may be directed to the  Information  Agent
or the Dealer Manager,  whose addresses and telephone numbers appear on the back
cover  of the  Offer  to  Purchase.  See  Instruction  10  below.  Requests  for
additional  copies of the Offer to Purchase,  this Letter of  Transmittal or the
Notice of Guaranteed  Delivery or other  documents  related to the Offers may be
directed to the Information Agent.

[ ] CHECK HERE IF CERTIFICATES FOR TENDERED NOTES ARE ENCLOSED HEREWITH.

[ ] CHECK  HERE  IF TENDERED NOTES ARE BEING  DELIVERED BY  BOOK-ENTRY  TRANSFER
    MADE TO THE ACCOUNT  MAINTAINED BY THE DEPOSlTARY  WITH THE BOOK-ENTRY
    TRANSFER FACILITY AND COMPLETE THE FOLLOWING:

    Name of Tendering Institution:_____________________________________________

    If  Notes  will be  tendered  by  book-entry  transfer  at the
    Depository Trust Company, please provide the following information:

    Account Number:____________________________________________________________

    Transaction Code Number:___________________________________________________


                                       2
<PAGE>


        If  Holders  desire  to  tender  Notes  pursuant  to an  Offer  and  (i)
certificates for such Notes are not lost but are not immediately available, (ii)
time will not permit this Letter of Transmittal,  certificates for such Notes or
other required documents to reach the Depositary prior to the Expiration Time or
(iii) the procedures for book-entry  transfer  cannot be completed  prior to the
Expiration  Time,  such Holders may effect a tender of such Notes in  accordance
with the guaranteed delivery procedures set forth in the Offer to Purchase under
the  caption  "Procedures  for  Tendering   Notes--Guaranteed  Delivery.  "  See
Instruction 1 below.

[ ] CHECK HERE IF  TENDERED  NOTES ARE BEING  DELIVERED  PURSUANT TO A NOTICE OF
    GUARANTEED  DELIVERY  PREVIOUSLY  DELIVERED TO THE  DEPOSITARY  AND COMPLETE
    THE FOLLOWING:

    Name(s) of Registered Holder(s):___________________________________________

    Window Ticket No. (if any):________________________________________________

    Date of Execution of Notice of Guaranteed Delivery:________________________

    Name of Eligible Institution that Guaranteed Delivery:_____________________

    If Notes will be tendered  by  book-entry  transfer  at the  Depository
Trust Company, please provide the following information:

    Account Number:____________________________________________________________

    Transaction Code Number:___________________________________________________



<PAGE>


              List  below the  Notes to which  this  Letter  of  Transmittal
     relates.   If  the  space  provided  below  is  inadequate,   list  the
     certificate  numbers and  principal  amounts on a  separately  executed
     schedule and attach the schedule to this Letter of Transmittal. Tenders
     of Notes will be accepted only in principal  amounts equal to $1,000 or
     any integral multiple thereof.
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
                                                                                      Aggregate              Principal
       Names(s) and Address(es)             Issue                                     Principal               Amount
             of Holder(s)                    of             Certificate                Amount              Tendered (if
      (Please fill in, if blank)           Notes*           Number(s)**              Represented          less than all)
                  (1)                        (2)                (3)                      (4)                    (5)
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                       <C>              <C>                       <C>                  <C>




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



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






                                            Total
                                          Principal
                                           Amounts
                                          of Notes
- ---------------------------------------------------------------------------------------------------------------------------
  *  Indicate applicable issue of Notes of the Company: 6% Notes or 4.5% Notes.
  ** Need not be completed by Holders tendering by book-entry transfer (see below).
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>



<PAGE>


                  NOTE: SIGNATURES MUST BE PROVIDED BELOW.
         PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.

LADIES AND GENTLEMEN:

        Upon  the  terms  and  subject  to the  conditions  of the  Offers,  the
undersigned  hereby  tenders  to the  Company  the  principal  amount  of  Notes
indicated above. By signing below, the undersigned  acknowledges  receipt of the
Offer to Purchase  which,  together with this Letter of  Transmittal,  set forth
such terms and conditions and constitute the Offers.

        Subject to, and  effective  upon,  the  acceptance  for purchase of, and
payment  for,  the  principal  amount  of Notes  tendered  with  this  Letter of
Transmittal, the undersigned hereby sells, assigns and transfers to, or upon the
order of the Company all right,  title and interest in and to the Notes that are
being tendered hereby, waives any and all other rights with respect to the Notes
(including,  without  limitation,  any  existing  or  past  defaults  and  their
consequences  in respect of the Notes and the  Indenture  under  which the Notes
were  issued) and releases  and  discharges  the Company from any and all claims
such Holder may have now, or may have in the future,  arising out of, or related
to, the Notes,  including  without  limitation  any claims  that such  Holder is
entitled to receive  additional  principal or interest  payments with respect to
the Notes or to participate  in any  redemption or defeasance of the Notes.  The
undersigned hereby irrevocably  constitutes and appoints the Depositary the true
and lawful agent and  attorney-in-fact  of the undersigned  (with full knowledge
that the Depositary  also acts as the agent of the Company) with respect to such
Notes, with full power of substitution (such  power-of-attorney  being deemed to
be an irrevocable power coupled with an interest), to (i) present such Notes and
all evidences of transfer and authenticity to, or transfer of ownership of, such
Notes on the account books maintained by the Book-Entry  Transfer Facility to or
upon the order of the Company, (ii) present such Notes for transfer of ownership
on the books of the relevant  security  register and (iii)  receive all benefits
and otherwise exercise all rights of beneficial  ownership of such Notes, all in
accordance  with the terms of and  conditions  to the Offers as described in the
Offer to Purchase and herein.

        The undersigned understands and acknowledges that the Offers will expire
at 5:00 p.m.,  New York City time,  on August 17, 1999,  unless  extended by the
Company in its sole discretion or terminated earlier.

        The  undersigned  understands  that tenders of Notes may be withdrawn by
written notice of withdrawal received by the Depositary at any time prior to the
Expiration  Time and,  unless  theretofore  accepted  for payment by the Company
pursuant to the relevant Offer, may also be validly  withdrawn at any time after
Tuesday, September 14, 1999.

        The undersigned understands that tenders of Notes pursuant to any of the
procedures described in the Offer to Purchase and in the instructions hereto and
acceptance  thereof by the Company will constitute a binding  agreement  between
the  undersigned and the Company upon the terms and subject to the conditions of
the Offers.

        The undersigned hereby represents and warrants that: (a) the undersigned
has full power and  authority  to tender,  sell,  assign and  transfer the Notes
tendered  hereby,  and (b) that when such Notes are  accepted  for  purchase and
payment by the Company,  the Company will acquire good title  thereto,  free and
clear of all liens,  restrictions,  charges and  encumbrances and not subject to
any adverse claim or right.  The undersigned  will, upon request by the Company,
the  Depositary  or the Trustee,  execute and deliver any  additional  documents
deemed  by the  Company,  the  Depositary  or the  Trustee  to be  necessary  or
desirable to complete the sale,  assignment  and transfer of the Notes  tendered
hereby.

        For purposes of the Offers, the undersigned understands that the Company
will be  deemed  to have  accepted  for  purchase  validly  tendered  Notes  (or
defectively  tendered  Notes with  respect to which the  Company has waived such
defect), if, as and when the Company gives oral notice (confirmed in writing) or
written notice thereof to the Depositary.

                                       5

<PAGE>


        The  undersigned  understands  that,  under  certain  circumstances  and
subject to certain  conditions  of the Offers set forth in the Offer to Purchase
(each of which the  Company  may  waive),  the  Company  will not be required to
accept for  purchase any of the Notes  tendered  (including  any Notes  tendered
after the Expiration Time). Any Notes not accepted for purchase will be returned
promptly to the  undersigned  at the address set forth above,  unless  otherwise
indicated herein under "Special Delivery Instructions" below.

        All  authority  conferred  or agreed to be  conferred  by this Letter of
Transmittal shall survive the death or incapacity of the undersigned,  and every
obligation of the undersigned  under this Letter of Transmittal shall be binding
upon   the   undersigned's   heirs,   personal    representatives,    executors,
administrators,  successors,  assigns,  trustees in  bankruptcy  and other legal
representatives.

        The undersigned understands that the delivery and surrender of the Notes
is not  effective,  and  the  risk of loss of the  Notes  does  not  pass to the
Depositary,  until receipt by the Depositary of this Letter of Transmittal, or a
facsimile, properly completed and duly executed (or, in the case of a book-entry
transfer,  an  Agent's  Message,  if  applicable,  in  lieu  of  the  Letter  of
Transmittal),  together  with all  accompanying  evidences of authority  and any
other required  documents in form satisfactory to the Company.  All questions as
to form of all  documents  and the  validity  (including  time of  receipt)  and
acceptance  of  tenders  and  withdrawals  of Notes  will be  determined  by the
Company, in its sole discretion, which determination shall be final and binding.

                                       6

<PAGE>

                                PLEASE SIGN HERE
               (TO BE COMPLETED BY ALL TENDERING HOLDERS OF NOTES
      REGARDLESS OF WHETHER NOTES ARE BEING PHYSICALLY DELIVERED HEREWITH)

         This Letter of Transmittal must be signed by each registered  Holder of
     Notes exactly as its name appears on the  certificate(s)  for the Notes or,
     if tendered by a participant in the Book-Entry  Transfer Facility,  exactly
     as such  participant's  name appears on a security  position listing as the
     owner of the Notes, or by a person authorized to become a registered Holder
     by endorsements on certificates for the Notes or by bond powers transmitted
     with this Letter of  Transmittal.  Endorsements on the Notes and signatures
     on  bond  powers  by  registered  Holders  not  executing  this  Letter  of
     Transmittal must be guaranteed by an Eligible Institution.  See Instruction
     3 below. If signature is by a trustee, executor,  administrator,  guardian,
     attorney-in-fact,  officer  or  other  person  acting  in  a  fiduciary  or
     representative  capacity,  such person must set forth his or her full title
     below under  "Capacity" and submit evidence  satisfactory to the Company of
     such person's authority to so act. See Instruction 3 below.


   X___________________________________________________________________________
   (Signature(s) of Registered Holder(s) or Authorized Signature)

   Dated: _____________________, 1999

   Name(s): ___________________________________________________________________
            ___________________________________________________________________
                                                      (Please Print)

   Capacity: __________________________________________________________________

   Address: ___________________________________________________________________

            ___________________________________________________________________
                                                   (Including Zip Code)

   Area Code and Telephone No: ________________________________________________
                                    PLEASE COMPLETE SUBSTITUTE FORM W-9 HEREIN

                  SIGNATURE GUARANTEE (See Instruction 3 below)
       (Certain Signatures Must Be Guaranteed by an Eligible Institution)

   ----------------------------------------------------------------------------
              (Name of Eligible Institution Guaranteeing Signature)

   ----------------------------------------------------------------------------
               (Address (including Zip Code) and Telephone Number
                         (including Area Code) of Firm)

   ----------------------------------------------------------------------------
                             (Authorized Signature)

   ----------------------------------------------------------------------------
                                 (Printed Name)

   ----------------------------------------------------------------------------
                                     (Title)

   Dated: _______________________, 1999

                                       7
<PAGE>

                          SPECIAL PAYMENT INSTRUCTIONS
                        (See Instructions 2, 3, 4 and 6)

  To be completed ONLY if the applicable Purchase Price is to be paid to someone
  other than the registered Holder or Acting Holder.  Unless one or more persons
  is designated under "Special Delivery Instructions," Notes not accepted in the
  Offers, or certificates for principal amounts not being tendered, will also be
  delivered to the person(s) designated herein.


                    Pay the applicable Purchase Price to:


                    Name(s): _______________________________
                                 (Please Print)


                    Address: _______________________________

                    ________________________________________

                    ________________________________________
                              (Including Zip Code)

                    ________________________________________
                   Taxpayer Identification Number (i.e., Social
                   Security Number or Employer Identification
                   Number) (also complete Substitute Form W-9)



                          SPECIAL DELIVERY INSTRUCTIONS
                        (See Instructions 2, 3, 4 and 6)

  To be completed ONLY if Notes not accepted in the Offers,  or certificates for
  principal  amounts  not being  tendered,  are to be  delivered  in the name of
  someone other than the registered  Holder or Acting Holder or to the person(s)
  designated above under "Special Payment Instructions."





  Deliver the Notes to:


                    Name(s): _______________________________
                                 (Please Print)


                    Address: _______________________________
                    ________________________________________
                    ________________________________________
                              (Including Zip Code)


<PAGE>


                                  INSTRUCTIONS

             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFERS

        1. DELIVERY OF THIS LETTER OF TRANSMITTAL AND CERTIFICATES FOR THE NOTES
OR  BOOK-ENTRY  CONFIRMATIONS;  GUARANTEED  DELIVERY  PROCEDURES;  WITHDRAWAL OF
TENDERS. To tender Notes,  physical delivery of certificates for such Notes or a
confirmation of any book-entry  transfer into the Depositary's  account with the
Book-Entry  Transfer  Facility of Notes  tendered  electronically,  as well as a
properly  completed  and duly  executed  copy or  facsimile  of this  Letter  of
Transmittal,  or an Agent's Message (as defined), if applicable,  in lieu of the
Letter  of  Transmittal,  and any other  documents  required  by this  Letter of
Transmittal,  must be received by the  Depositary  at one of its  addresses  set
forth herein prior to the Expiration  Time.  Tenders of Notes in the Offers will
be  accepted  in  accordance  with the  procedures  described  in the  preceding
sentence and otherwise in compliance with this Letter of  Transmittal.  The term
"Agent's  Message"  means  a  message  transmitted  by the  Book-Entry  Transfer
Facility to, and received by, the  Depositary and forming a part of a Book-Entry
Confirmation, which states that the Book-Entry Transfer Facility has received an
express  acknowledgment from the participant in the Book-Entry Transfer Facility
tendering Notes that such participant has received and agrees to be bound by the
terms of the  Letter  of  Transmittal  and that the  Company  may  enforce  such
agreement  against  the  participant.  The method of  delivery of this Letter of
Transmittal,  the Notes and all other required documents to the Depositary is at
the election and risk of Holders.  If such  delivery is by mail, it is suggested
that Holders use properly insured,  registered mail,  return receipt  requested,
and  that  the  mailing  be  made  sufficiently  in  advance  of the  applicable
Expiration Time to permit delivery to the Depositary prior to such date.  Except
as otherwise  provided  below,  the delivery  will be deemed made when  actually
received or  confirmed by the  Depositary.  THIS LETTER OF  TRANSMITTAL  AND THE
NOTES  SHOULD  BE SENT  ONLY TO THE  DEPOSITARY,  AND  NOT TO THE  COMPANY,  THE
TRUSTEES, THE DEALER MANAGER OR THE BOOK-ENTRY TRANSFER FACILITY.

        If  Holders  desire to  tender  Notes  pursuant  to the  Offers  and (i)
certificates for such Notes are not lost but are not immediately available, (ii)
time will not permit this Letter of Transmittal,  certificates for such Notes or
other required documents to reach the Depositary prior to the Expiration Time or
(iii) the procedures for book-entry  transfer  cannot be completed  prior to the
Expiration  Time,  such  Holders may effect a tender of the Notes in  accordance
with the guaranteed delivery procedures set forth in the Offer to Purchase under
the caption "Procedures for Tendering Notes--Guaranteed Delivery."

        Pursuant to the guaranteed delivery procedures:

         (a) such tender and delivery must be made by or through an
         "Eligible  Institution"  that is a participant in the Security Transfer
         Agents Medallion Program or the Stock Exchange Medallion Program;

         (b) on or  prior to the  Expiration  Time,  the  Depositary  must  have
         received from such Eligible Institution, at one of the addresses of the
         Depositary  set forth  herein,  a properly  completed and duly executed
         Notice  of   Guaranteed   Delivery   (by  manually   signed   facsimile
         transmission, mail or hand delivery) in substantially the form provided
         by the  Company,  setting  forth the  name(s)  and  address(es)  of the
         registered  Holder(s),  and the  principal  amount of the  Notes  being
         tendered,  and  stating  that the  tender  is being  made  thereby  and
         guaranteeing  that,  within  three  New York  Stock  Exchange  ("NYSE")
         trading  days after the date of the Notice of  Guaranteed  Delivery,  a
         properly  completed  and duly  executed  Letter  of  Transmittal  (or a
         manually signed  facsimile),  together with certificates for such Notes
         (or  confirmation  of  book-entry  transfer  of  such  Notes  into  the
         Depositary's  account with the  Book-Entry  Transfer  Facility  and, if
         applicable,  an Agent's Message in lieu of the Letter of  Transmittal),
         and any other documents  required by this Letter of Transmittal and the
         instructions  hereto,  will be deposited by such  Eligible  Institution
         with the Depositary; and

         (c) this  Letter  of  Transmittal  (or a  manually  signed  facsimile),
         properly  completed  and  duly  executed  with any  required  signature
         guarantees,  together with  certificates  for all physically  delivered
         Notes in  proper  form for  transfer  (or  confirmation  of  book-entry
         transfer  of  such  Notes  into  the  Depositary's   account  with  the
         Book-Entry Transfer Facility and, if applicable,  an Agent's Message in
         lieu of the Letter of  Transmittal),  and any other required  documents
         must be received by the Depositary within three NYSE trading days after
         the date of the Notice of Guaranteed Delivery.

                                       9

<PAGE>

        Tenders  of Notes may be  withdrawn  at any time  prior to the  relevant
Expiration  Time and,  unless  theretofore  accepted  for payment by the Company
pursuant to the relevant Offer, may also be validly  withdrawn at any time after
Tuesday,  September  14, 1999, by written  notice of withdrawal  received by the
Depositary  delivered by mail,  hand delivery or facsimile  transmission.  To be
valid, notice of withdrawal of tendered Notes must (i) be timely received by the
Depositary at one of its  addresses  set forth herein,  (ii) specify the name of
the person who deposited the Notes to be withdrawn  (the  "Depositor"),  and the
name in which the Notes are registered (or, if tendered by book-entry  transfer,
the name of the  participant  in the  Book-Entry  Transfer  Facility  whose name
appears on a security position listing as the owner of such Notes), if different
from that of the Depositor,  (iii) specify the principal  amount of the Notes to
be  withdrawn  and (iv) be signed  by the  Depositor  in the same  manner as the
original  signature  on this  Letter  of  Transmittal  (including  any  required
signature  guarantees) or be accompanied by evidence satisfactory to the Company
and the  Depositary  that the person  withdrawing  the tender has  succeeded  to
beneficial  ownership  of the Notes.  If  certificates  have been  delivered  or
otherwise identified (through confirmation of book-entry transfer of such Notes)
to the Depositary,  the name of the registered Holder and the certificate number
or  numbers  relating  to such  withdrawn  Notes must also be  furnished  to the
Depositary as aforesaid prior to the physical  release of the  certificates  for
the  withdrawn  Notes  (or,  in the  case of  Notes  transferred  by  book-entry
transfer, the name and number of the account at the Book-Entry Transfer Facility
to be credited with withdrawn Notes).

        2.  PARTIAL  TENDERS.  Tenders of Notes  pursuant  to the Offers will be
accepted  only in  respect  of  principal  amounts  equal to $1,000 or  integral
multiples  thereof.  If less  than  the  entire  principal  amount  of any  Note
evidenced by a submitted certificate is tendered, the tendering Holder must fill
in the  principal  amount  tendered  in the  last  column  of the  box  entitled
"Description  of Notes  Tendered"  herein.  Unless  otherwise  indicated in that
column,  the entire  principal  amount  represented by the  certificates for all
Notes delivered to the Depositary  will be deemed to have been tendered.  If the
entire  principal  amount  of all  Notes is not  tendered  or not  accepted  for
purchase,  the Notes for such untendered amount will be sent (or, if tendered by
book-entry  transfer,  returned  by  credit  to the  account  at the  Book-Entry
Transfer Facility) to the registered Holder or Acting Holders,  unless otherwise
provided in the appropriate box on this Letter of Transmittal  (see  Instruction
4), promptly after the Notes are accepted for purchase.

        3.   SIGNATURES  ON  THIS  LETTER  OF   TRANSMITTAL,   BOND  POWERS  AND
ENDORSEMENT; GUARANTEE OF SIGNATURES. If this Letter of Transmittal is signed by
the registered  Holder(s) of the Notes tendered hereby,  the  signature(s)  must
correspond  with the  name(s)  as  written  on the  face of the  certificate(s),
without  alteration,  enlargement  or any change  whatsoever.  If this Letter of
Transmittal is signed by a participant in the Book-Entry Transfer Facility whose
name is shown as the owner of the Notes  tendered  hereby,  the  signature  must
correspond with the name shown on the security  position listing as the owner of
the Notes.

        If any of the Notes tendered hereby are registered in the name of two or
more  Holders,  all such  Holders must sign this Letter of  Transmittal.  If any
tendered Notes are  registered in different  names on several  certificates,  it
will be necessary to complete,  sign and submit as many separate  copies of this
Letter of  Transmittal  and any  necessary  accompanying  documents as there are
different names in which certificates are held.

        If this  Letter of  Transmittal  is signed by the  registered  Holder or
Acting  Holder,  and the  certificates  for any  principal  amount  of Notes not
tendered or not  accepted  for  purchase  are to be issued (or if any  principal
amount of Notes that is not  tendered  or not  accepted  for  purchase  is to be
reissued or returned) to or, if tendered by book-entry transfer, credited to the
account at the Book-Entry  Transfer  Facility of the registered Holder or Acting
Holder,  and checks for payments of the applicable  Purchase Price to be made in
connection  with the  Offers  are to be issued  to the  order of the  registered
Holder or Acting Holder,  then the  registered  Holder or Acting Holder need not
endorse any  certificates  for tendered Notes nor provide a separate bond power.
In any other case  (including if this Letter of Transmittal is not signed by the
registered Holder or Acting Holder), the registered Holder or Acting Holder must
either properly  endorse the  certificates  for the tendered Notes or transmit a
separate  properly  completed  bond power with this  Letter of  Transmittal  (in
either case,  executed exactly as the name of each registered  Holder appears on
such Notes,  and,  with  respect to a  participant  in the  Book-Entry  Transfer
Facility whose name appears on a security  position  listing as the owner of the
Notes, exactly as the name of each participant appears on such security position
listing),  with the signature on the endorsement or bond power  guaranteed by an
Eligible Institution, unless such certificates or bond powers are executed by an
Eligible Institution.

                                       10

<PAGE>


        If this  Letter of  Transmittal  or any  certificates  for Notes or bond
powers   are  signed  by   trustees,   executors,   administrators,   guardians,
attorneys-in-fact,  officers of  corporations or others acting in a fiduciary or
representative  capacity,  such persons  should so indicate  when  signing,  and
proper evidence satisfactory to the Company of their authority so to act must be
submitted with this Letter of Transmittal.

        Endorsements  on  certificates  for Notes and  signatures on bond powers
provided  in  accordance  with this  Instruction  3 by  registered  Holders  not
executing  this  Letter  of  Transmittal  must  be  guaranteed  by  an  Eligible
Institution.

        No signature  guarantee is required if (i) this Letter of Transmittal is
signed by the  registered  Holder(s)  of the Notes  tendered  herewith  (or by a
participant in the Book-Entry Transfer Facility whose name appears on a security
position  listing  it as the  owner of  Notes)  and  payment  of the  applicable
Purchase Price is to be made, or any Notes for principal amounts not tendered or
not accepted for purchase are to be issued,  directly to such  Holder(s) (or, if
tendered by a participant in the  Book-Entry  Transfer  Facility,  any Notes for
principal  amounts not  tendered or not accepted for purchase are to be credited
to such participant's  account at the Book-Entry  Transfer Facility) and neither
the "Special Payment  Instructions" box nor the "Special Delivery  Instructions"
box of this Letter of  Transmittal  has been  completed,  or (ii) such Notes are
tendered for the account of an Eligible  Institution.  In all other  cases,  all
signatures  on  Letters  of  Transmittal  and   endorsements  on   certificates,
signatures on bond powers (if any)  accompanying the Notes must be guaranteed by
an Eligible Institution.

        4. SPECIAL PAYMENT AND SPECIAL DELIVERY INSTRUCTIONS.  If the applicable
Purchase  Price is to be paid in the name of someone  other  than the  tendering
Holder,  the tendering  Holder must fill in the  information in the box entitled
"Special  Payment  Instructions."  If the Notes not  accepted in the Offers,  or
certificates  for principal  amounts not being tendered,  are to be delivered in
the name of someone other than the tendering  Holder,  the tendering Holder must
fill in the  information in the box entitled  "Special  Delivery  Instructions."
Unless one or more different  persons is indicated in the box entitled  "Special
Delivery  Instructions,"  Notes not accepted in the Offers,  or certificates for
principal  amounts  not being  tendered,  will be  delivered  in the name of the
person(s) designated in the box entitled "Special Payment Instructions."

        5. TAXPAYER  IDENTIFICATION NUMBER. Each tendering Holder is required to
provide the Depositary with the Holder's correct taxpayer  identification number
("TIN"),  generally  the  Holder's  social  security or employer  identification
number,  on  Substitute  Form  W-9,  which  is  provided  under  "Important  Tax
Information" below, or, alternatively,  to establish another basis for exemption
from backup  withholding.  A Holder must cross out item (2) in the Certification
box on  Substitute  Form W-9 if such  Holder is subject  to backup  withholding.
Failure to provide the information on the form may subject the tendering  Holder
to federal income tax backup withholding at the rate of 31% on the payments made
to the Holder or other  payee with  respect to Notes  purchased  pursuant to the
Offers.  The box in Part 3 of the form should be checked if the tendering Holder
has not been  issued a TIN and has  applied  for a TIN or intends to apply for a
TIN in the near future.  If the box in Part 3 is checked and the  Depositary  is
not provided with a TIN by the date of payment, the Depositary will withhold 31%
of all payments of the applicable Purchase Price.

        6.  TRANSFER  TAXES.  Except  as set  forth in this  Instruction  6, the
Company will pay all transfer  taxes  applicable to the purchase and transfer of
Notes pursuant to the Offers. However, if payment for Notes is to be made to, or
deliveries of certificates  for Notes for principal  amounts not tendered or not
accepted  for  payment are to be made to, any person  other than the  registered
Holder or Acting  Holder of Notes  tendered  thereby,  or if a  transfer  tax is
imposed for any reason other than the purchase and transfer of Notes pursuant to
the  Offers,  the  amount of any such  transfer  taxes  (whether  imposed on the
registered  Holder or Acting  Holder,  such other person or  otherwise)  will be
deducted  from the  payment  unless  transfer  tax  stamps  are  affixed  to the
certificates listed in this Letter of Transmittal or other satisfactory evidence
of the payment of such taxes, or exemption therefrom, is submitted.

                                       11

<PAGE>


Except as provided in this  Instruction 6, it will not be necessary for transfer
tax  stamps  to be  affixed  to  the  certificates  listed  in  this  Letter  of
Transmittal.

        7. IRREGULARITIES. All questions as to the form of all documents and the
validity  (including  time  of  receipt)  and  acceptance  of  all  tenders  and
withdrawals of Notes will be determined by the Company,  in its sole discretion,
which  determination  shall be final and binding.  Alternative,  conditional  or
contingent  tenders of Notes will not be considered  valid. The Company reserves
the  absolute  right to reject  any or all  tenders of Notes in respect of Notes
that are not in proper form or the  acceptance of which would,  in the Company's
opinion,  be unlawful.  The Company also reserves the right to waive any defects
or irregularities as to particular Notes. The Company's  interpretations  of the
terms and conditions of the Offers (including the instructions in this Letter of
Transmittal) will be final and binding. Any defect or irregularity in connection
with tenders of Notes must be cured within such time as the Company  determines,
unless waived by the Company.  Tenders of Notes shall not be deemed to have been
made until all  defects  and  irregularities  have been waived by the Company or
cured.  By execution of this Letter of  Transmittal or a facsimile  hereof,  all
tendering  Holders waive any right to receive  notice of the acceptance of their
Notes for purchase. None of the Company, the Depositary, the Dealer Manager, the
Trustees  or any  other  person  will be under  any duty to give  notice  of any
defects or  irregularities  in tenders of Notes,  or will incur any liability to
Holders for failure to give any such notice.

        8. WAIVER OF CONDITIONS.  The Company  expressly  reserves the right, in
its reasonable discretion, to amend or waive any of the conditions to the Offers
in the case of any Notes tendered in whole or in part, at any time and from time
to time.

        9. MUTILATED,  LOST,  STOLEN OR DESTROYED  CERTIFICATES  FOR NOTES.  Any
Holder  whose  certificates  for Notes  have  been  mutilated,  lost,  stolen or
destroyed  should write to or telephone  the relevant  Trustee at the address or
telephone  number  set  forth  in  the  Offer  to  Purchase  under  the  caption
"Procedures for Tendering Notes -- Lost or Missing Certificates."

        10. REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.  Questions relating to
the procedure for tendering Notes and requests for assistance may be directed to
the  Information  Agent or the Dealer  Manager,  whose  addresses  and telephone
numbers  appear  on the  last  page  of the  Offer  to  Purchase.  Requests  for
additional  copies of the Offer to  Purchase,  this Letter of  Transmittal,  the
Notice of Guaranteed  Delivery or other  documents  related to the Offers may be
directed to the Information Agent.

                            IMPORTANT TAX INFORMATION

        Under U.S.  federal  income tax laws, a Holder whose  tendered Notes are
accepted for payment is required to provide the  Depositary (as payer) with such
Holder's correct TIN on Substitute Form W-9 below or otherwise establish a basis
for exemption from backup withholding.  If such Holder is an individual, the TIN
is his or her social security number. If the Depositary is not provided with the
correct TIN, a $50 penalty may be imposed by the Internal Revenue  Service,  and
payments  made to such Holder with  respect to Notes  purchased  pursuant to the
Offers may be subject to 31% backup withholding.

        Certain  Holders   (including  all   corporations  and  certain  foreign
individuals)  are  not  subject  to  these  backup   withholding  and  reporting
requirements.  Where a payment is potentially subject to backup withholding,  in
order  for a  foreign  individual  to  qualify  as  an  exempt  recipient,  such
individual  must generally  submit an Internal  Revenue Service Form W-8, signed
under penalties of perjury, attesting to such individual's exempt status. A Form
W-8  is  available  from  the  Depositary.  See  the  enclosed  "Guidelines  for
Certification  of Taxpayer  Identification  Number on  Substitute  Form W-9" for
additional instructions.

        If backup  withholding  applies,  the Depositary is required to withhold
31% of any payments made to the Holder or other payee. Backup withholding is not
an additional  federal income tax.  Rather,  the federal income tax liability of
persons  subject  to backup  withholding  will be  reduced  by the amount of tax
withheld.  If  withholding  results in an  overpayment of taxes, a refund may be
obtained from the Internal Revenue Service.


                                       12
<PAGE>


PURPOSE OF SUBSTITUTE FORM W-9

         To prevent  backup  withholding  on payments made with respect to Notes
purchased  pursuant  to the  Offers,  the  Holder is  required  to  provide  the
Depositary  with (i) the  Holder's  correct  TIN by  completing  the form below,
certifying that the TIN provided on Substitute Form W-9 is correct (or that such
Holder  is  awaiting  a TIN) and that (A) such  Holder  is  exempt  from  backup
withholding,  (B) the  Holder  has not been  notified  by the  Internal  Revenue
Service that the Holder is subject to backup  withholding as a result of failure
to report all  interest or dividends  or (C) the  Internal  Revenue  Service has
notified the Holder that the Holder is no longer subject to backup  withholding,
and (ii) if applicable, an adequate basis for exemption.

WHAT NUMBER TO GIVE THE DEPOSITARY

         The Holder is required to give the Depositary the TIN of the Holder. If
the  Notes  are  held in more  than  one name or are held not in the name of the
actual owner,  consult the enclosed  "Guidelines for  Certification  of Taxpayer
Identification  Number on Substitute Form W-9" for additional  guidance on which
number to report.


                                       13
<PAGE>
             PAYER'S NAME: UNITED STATES TRUST COMPANY OF NEW YORK

SUBSTITUTE

FORM W-9


DEPARTMENT OF THE TREASURY
INTERNAL REVENUE SERVICE

PAYER'S REQUEST FOR
TAXPAYER IDENTIFICATION
NUMBER ("TIN")

Part 1 - PLEASE  PROVIDE YOUR TIN IN THE BOX AT RIGHT AND CERTIFY BY SIGNING AND
DATING BELOW.

                             ----------------------
                             Social Security Number
                                       or

                             ----------------------
                             Employer Identification
                                     Number

  Part 2 - CERTIFICATION - Under penalties of perjury, I certify that:

(1)The number shown on this form is my correct  Taxpayer  Identification  Number
   (or I am waiting for a number to be issued to me), and

(2)I am not subject to backup  withholding  either  because:(a) I am exempt from
   backup  withholding,  (b) I have not been  notified by the  Internal  Revenue
   Service (the "IRS") that I am subject to backup  withholding as a result of a
   failure to report all  interest or  dividends  or (c) the IRS has notified me
   that I am no longer subject to backup withholding.


  CERTIFICATION  INSTRUCTIONS  - You must  cross  out item (2) above if you have
  been notified by the IRS that you are currently subject to backup  withholding
  because of underreporting  interest or dividends on your tax return.  However,
  if  after  being  notified  by  the  IRS  that  you  were  subject  to  backup
  withholding,  you received another  notification  from the IRS that you are no
  longer subject to backup withholding, do not cross out such item (2).


  SIGNATURE _____________________        DATE ______

  NAME (Please Print) ______________________________

  ADDRESS (Please Print) ___________________________


                                    Part 3 -
                                  Awaiting TIN
                                        [ ]

NOTE:   FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITH-
        HOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE
        REVIEW  THE   ENCLOSED   GUIDELINES   FOR   CERTIFICATION   OF  TAXPAYER
        IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.

        YOU MUST  COMPLETE THE FOLLOWING  CERTIFICATE  IF YOU CHECKED THE BOX IN
        PART 3 OF SUBSTITUTE FORM W-9.

                                       14

<PAGE>


             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER

          I certify under penalties of perjury that a taxpayer  identification
  number has not been issued to me, and either (1) I have mailed or delivered an
  application  to receive a Taxpayer  Identification  Number to the  appropriate
  Internal Revenue Service Center or Social Security  Administration  Office, or
  (2) I  intend  to mail  or  deliver  an  application  in the  near  future.  I
  understand  that if I do not provide a taxpayer  identification  number by the
  time of payment, 31% of all reportable payments made to me will be withheld.

  Signature ________________________________________________ Date ___________


  Name (Please Print): ______________________________________________________


  Address (Please Print): ___________________________________________________


                                       15

<PAGE>


                    THE INFORMATION AGENT FOR THE OFFERS IS:


                                156 Fifth Avenue
                            New York, New York 10010
                           212-929-5500 (Call Collect)
                                       or
                         (800) 322-2885 (Call Toll Free)

                      The Dealer Manager for the Offers is:

                          Donaldson, Lufkin & Jenrette

                                 277 Park Avenue
                            New York, New York 10172
                   (800) 255-9260, ext. 4131 (Call Toll Free)

THIS NOTICE OF  GUARANTEED  DELIVERY IS BEING USED WITH RESPECT TO THE FOLLOWING
ISSUE OF NOTES OF CONCENTRA MANAGED CARE, INC. (CHECK ONLY ONE*):
         [ ] 6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
             CUSIP #: 20589T-AA-1
                      674623-AA-1 (FORMERLY OCCUSYSTEMS, INC.)
         [ ] 4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003
             CUSIP #: 20589T-AB-9
                      20589T-AC-7

                          NOTICE OF GUARANTEED DELIVERY

                      PURSUANT TO THE OFFER TO PURCHASE OF
                          CONCENTRA MANAGED CARE, INC.
                               DATED JULY 20, 1999

         This Notice of Guaranteed  Delivery,  or one  substantially in the form
hereof,  must be used to tender the 6% Convertible  Subordinated  Notes due 2001
(the "6% Notes") or the 4.5% Convertible  Subordinated Notes due 2003 (the "4.5%
Notes" and,  together with the 6% Notes, the "Notes") of Concentra Managed Care,
Inc. (the "Company") pursuant to the Offer to Purchase (as defined below) if (i)
certificates for such Notes are not lost but are not immediately available, (ii)
time will not permit the Letter of  Transmittal  with  respect to the Notes (the
"Letter of Transmittal"),  certificates for Notes or other required documents to
reach United  States Trust Company of New York (the  "Depositary")  prior to the
Expiration  Time (as  defined  below) or (iii)  the  procedures  for  book-entry
transfer  cannot be  completed  prior to the  Expiration  Time.  This  Notice of
Guaranteed Delivery may be delivered by hand or mail or transmitted by facsimile
transmission to the Depositary.

   EACH OFFER WILL EXPIRE AT 5:00 P.M.,  NEW YORK CITY TIME, ON TUESDAY,  AUGUST
   17, 1999 UNLESS EXTENDED OR TERMINATED (SUCH TIME AND DATE OR THE LATEST TIME
   AND DATE TO WHICH THE  RELEVANT  OFFER (AS DEFINED IN THE OFFER TO  PURCHASE)
   MAY BE  EXTENDED OR  TERMINATED  WITH  RESPECT TO EACH OF THE  OFFERS,  BEING
   REFERRED TO HEREIN AS THE  "EXPIRATION  TIME").  HOLDERS OF NOTES MUST TENDER
   THEIR NOTES PRIOR TO THE APPLICABLE EXPIRATION TIME TO RECEIVE THE APPLICABLE
   PURCHASE  PRICE  (ASDEFINEDINTHEOFFERTOPURCHASE).  TENDERS  OF  NOTES  MAY BE
   VALIDLY  WITHDRAWN  AT ANY TIME  PRIOR TO THE  EXPIRATION  TIME  AND,  UNLESS
   THERETOFORE  ACCEPTED  FOR  PAYMENT BY THE COMPANY  PURSUANT TO THE  RELEVANT
   OFFER,  MAY BE VALIDLY  WITHDRAWN AT ANY TIME AFTER  TUESDAY,  SEPTEMBER  14,
   1999.

<TABLE>
                                             THE DEPOSITARY FOR THE OFFERS IS:
                                          UNITED STATES TRUST COMPANY OF NEW YORK
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                                    <C>                                    <C>
           BY OVERNIGHT COURIER &                      BY HAND UP TO 4:30 P.M.                BY REGISTERED OR CERTIFIED MAIL:
           BY HAND AFTER 4:30 P.M.
  ON THE DATE OF THE EXPIRATION TIME ONLY:
   United States Trust of New York Company     United States Trust of New York Company     United States Trust of New York Company
          770 Broadway, 13th Floor                          111 Broadway                                P.O. Box 844
             New York, NY 10003                              Lower Level                        Attn:Corporate Trust Services
       Attn: Corporate Trust Services              Attn: Corporate Trust Services                      Cooper Station
                                                         New York,  NY 10006 New
                                                   York,      NY      10276-0844
                                                   By:Facsimile Number:
                                                       212-420-6211

                                               Confirm by Telephone Number:
                                                       800-548-6565
</TABLE>

         DELIVERY  OF THIS  NOTICE OF  GUARANTEED  DELIVERY  TO AN  ADDRESS,  OR
TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE,  OTHER THAN AS SET FORTH ABOVE, WILL
NOT CONSTITUTE A VALID DELIVERY.

- --------------------------------------------------------------------------------
* If Notes of more than one issue are being tendered,  it is necessary to return
a separate form for each issue of Notes. Please check the appropriate box at the
top of this  page to  indicate  the  issue  of Notes to  which  this  Notice  of
Guaranteed Delivery relates.
<PAGE>

         This form is not to be used to guarantee signatures.  If a signature on
a  Letter  of   Transmittal  is  required  to  be  guaranteed  by  an  "Eligible
Institution"  under the  instructions  thereto,  such  signature  guarantee must
appear in the  applicable  space  provided in the signature box on the Letter of
Transmittal.

LADIES AND GENTLEMEN:

         By execution hereof, the undersigned  acknowledges receipt of the Offer
to  Purchase,  dated July 20,  1999 (as the same may be amended or  supplemented
from  time  to  time,  the  "Offer  to  Purchase"),  of  the  Company,  and  the
accompanying  Letter of Transmittal  and  instructions  thereto,  which together
constitute  the Company's  offer to purchase for cash all of its  outstanding 6%
Notes and 4.5% Notes,  upon the terms and subject to the conditions set forth in
the Offer to Purchase and the Letter of Transmittal.

         Upon the terms and subject to the  conditions  of the Offer to Purchase
and the Letter of Transmittal, the undersigned hereby tenders to the Company the
principal amount of 6% Notes or 4.5% Notes as indicated  below,  pursuant to the
guaranteed  delivery  procedures  described  in the Offer to Purchase  under the
caption "Procedures for Tendering Notes--Guaranteed Delivery."

         All  authority  conferred  or agreed to be  conferred by this Notice of
Guaranteed  Delivery  shall survive the death or incapacity of the  undersigned,
and every obligation of the undersigned under the Letter of Transmittal shall be
binding  upon the  undersigned's  heirs,  personal  representatives,  executors,
administrators,  successors,  assigns,  trustees in  bankruptcy  and other legal
representatives.

                                       2

<PAGE>

<TABLE>
<CAPTION>
                  Issue of Notes                        Certificate Number                           Principal Amount
                   Tendered                                 (if available)                                 Tendered
<S>              <C>                                    <C>                                          <C>
- ---------------------------------------------------------------------------------------------------------------------------

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

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

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


- ---------------------------------------------------------------------------------------------------------------------------
                                                 PLEASE SIGN AND COMPLETE

   Signature(s) of Registered Holder(s)                              Dated: _______________________________________________, 1999
   or Authorized Signatory:_______________________________________   Address(es): _______________________________________________
   _______________________________________________________________   ____________________________________________________________
   Name(s) of Registered Holder(s):_______________________________   Area Code and Telephone No.: _______________________________
   _______________________________________________________________   If Notes will be delivered by book-entry transfer to
   _______________________________________________________________   the Depository Trust Company ("DTC"), check the box: M
   _______________________________________________________________   DTC Account No.: ___________________________________________
</TABLE>

This Notice of  Guaranteed  Delivery  must be signed by each  registered  holder
exactly as its name  appears on  certificate(s)  for Notes or, if  tendered by a
participant  in DTC,  exactly as such  participant's  name appears on a security
position  listing as the owner of Notes,  or by person(s)  authorized  to become
Holder(s)  by  endorsements  and  documents  transmitted  with  this  Notice  of
Guaranteed  Delivery.  If  signature is by a trustee,  executor,  administrator,
guardian,  attorney-in-fact,  officer of a  corporation,  agent or other  person
acting in a fiduciary or representative  capacity,  such person must provide the
following information:


                      PLEASE PRINT NAME(S) AND ADDRESS(ES)

   Name(s):_____________________________________________________________________
   _____________________________________________________________________________
   Capacity:____________________________________________________________________
   Address(es):_________________________________________________________________
   _____________________________________________________________________________
   _____________________________________________________________________________
                                   (Zip Code)

   DO NOT SEND  NOTES WITH THIS FORM.  NOTES  SHOULD BE SENT TO THE  DEPOSITARY,
   TOGETHER WITH A PROPERLY  COMPLETED AND DULY EXECUTED  LETTER OF  TRANSMITTAL
   AND ANY OTHER REQUIRED DOCUMENTS.

                                       3

<PAGE>




                                    GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)

            The  undersigned,  a bank,  broker,  dealer,  credit union,  savings
   association or other entity that is a member of the Security  Transfer Agents
   Medallion  Program or the Stock  Exchange  Medallion  Program  (an  "Eligible
   Institution")  hereby (i)  represents  that each holder of the Notes on whose
   behalf this tender is being made "owns" the Notes tendered  hereby within the
   meaning of Rule 14e-4 under the Securities  Exchange Act of 1934, as amended,
   (ii)  represents that such tender of such Notes complies with such Rule 14e-4
   and (iii)  guarantees  that the  Notes  tendered  hereby  in proper  form for
   transfer  together  with a properly  completed  and duly  executed  Letter of
   Transmittal,  or a manually  signed  facsimile,  with any required  signature
   guarantees,  and any other documents required by the Letter of Transmittal or
   a properly  transmitted Agent's Message (as defined in the Offer to Purchase)
   will be received by the  Depositary  at one of its  addresses set forth above
   within three New York Stock Exchange trading days after the date hereof.

            The Eligible  Institution  that completes this form must communicate
   the guarantee to the  Depositary  and must deliver the Letter of  Transmittal
   and certificates for the Notes to the Depositary within the time period shown
   herein.  Failure to do so could  result in  financial  loss to such  Eligible
   Institution.
<TABLE>
<S>                                                                <C>
   ______________________________________________________________________________________________________________________________

   Name of Firm:__________________________________________________   ____________________________________________________________
                                                                                        (Authorized Signature)
   Address:_______________________________________________________
                                                                     Name: ______________________________________________________
   _______________________________________________________________
                         (including Zip Code)                        Title: _____________________________________________________

   Area Code and Tel. No.:________________________________________   Date: ______________________________________________________
</TABLE>


NOTE: DO NOT SEND NOTES WITH THIS NOTICE. NOTES SHOULD BE SENT TO THE DEPOSITARY
TOGETHER WITH A PROPERLY  COMPLETED AND DULY EXECUTED  LETTER OF TRANSMITTAL AND
ANY OTHER REQUIRED DOCUMENTS.

                                       4


                          CONCENTRA MANAGED CARE, INC.
                           OFFER TO PURCHASE FOR CASH

        ALL OF ITS OUTSTANDING 6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
                              CUSIP #: 20589T-AA-1
                                       674623-AA-1 (FORMERLY OCCUSYSTEMS, INC.)
                                       AND
       ALL OF ITS OUTSTANDING 4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003
                              CUSIP #: 20589T-AB-9

EACH OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON TUESDAY,  AUGUST 17,
1999 UNLESS  EXTENDED OR  TERMINATED  (SUCH TIME AND DATE OR THE LATEST TIME AND
DATE TO WHICH THE RELEVANT  OFFER MAY BE EXTENDED OR TERMINATED  WITH RESPECT TO
EACH OF THE OFFERS, BEING REFERRED TO HEREIN AS THE "EXPIRATION TIME").  HOLDERS
OF NOTES (AS  DEFINED  BELOW) MUST  TENDER  THEIR NOTES PRIOR TO THE  APPLICABLE
EXPIRATION  TIME TO RECEIVE THE APPLICABLE  PURCHASE  PRICE (AS DEFINED  BELOW).
TENDERS OF NOTES MAY BE VALIDLY  WITHDRAWN  AT ANY TIME PRIOR TO THE  EXPIRATION
TIME AND, UNLESS THERETOFORE ACCEPTED FOR PAYMENT BY THE COMPANY PURSUANT TO THE
RELEVANT  OFFER,  MAY  ALSO BE  VALIDLY  WITHDRAWN  AT ANY TIME  AFTER  TUESDAY,
SEPTEMBER 14, 1999.


                                                           July 20, 1999
TO BROKERS, DEALERS, COMMERCIAL BANKS,
TRUST COMPANIES AND OTHER NOMINEES:

         We are enclosing  herewith the materials  listed below  relating to the
offer by Concentra Managed Care, Inc. (the "Company") to purchase (i) all of its
outstanding  6% Convertible  Subordinated  Notes due 2001 (the "6% Notes") for a
cash purchase price of $1,002.50 per $1000  principal  amount of 6% Notes,  plus
accrued and unpaid  interest up to, but not including,  the date of payment (the
"6% Notes Purchase  Price") and (ii) all of its outstanding  4.5% Notes due 2003
(the "4.5%  Notes" and,  together  with the 6% Notes,  the  "Notes")  for a cash
purchase  price of  $1,001.25  per $1000  principal  amount of 4.5% Notes,  plus
accrued and unpaid  interest up to, but not including,  the date of payment (the
"4.5% Notes Purchase Price" and,  together with the 6% Notes Purchase Price, the
"Purchase  Prices").  The offer to purchase each issue of Notes on the terms and
subject to the  conditions  set forth in the Offer to  Purchase,  dated July 20,
1999 (as the same may be amended or  supplemented  from time to time, the "Offer
to Purchase") and in the Letter of Transmittal  (the "Letter of Transmittal") is
referred to  individually  as an "Offer,"  and such offers with  respect to both
issues of Notes are  collectively  referred to as the "Offers."  Consummation of
the Offers is subject to, among other things, satisfaction of the conditions set
forth in the Offer to Purchase under the heading "Conditions of the Offers."

         We are  asking  you to  contact  your  clients  for whom you hold Notes
registered  in your name or in the name of your  nominee.  In  addition,  we are
asking you to contact your clients who, to your knowledge, hold Notes registered
in their own name.



<PAGE>


         Enclosed  for your  information  and use are  copies  of the  following
documents:

                    1.      The Offer to Purchase dated July 20, 1999;

                    2. A Letter  of  Transmittal  for the Notes for your use and
         for the  information  of your  clients,  together with  Guidelines  for
         Certification of Taxpayer  Identification Number on Substitute Form W-9
         providing  information  relating  to U.S.  federal  income  tax  backup
         withholding;

                    3. A form of  letter  that may be sent to your  clients  for
         whose  accounts you hold Notes  registered  in your name or the name of
         your   nominee,   with  space   provided  for  obtaining  the  clients'
         instructions with regard to the Offers;

                    4.      A Notice of Guaranteed Delivery for the Notes; and

                    5. The Proxy Statement of the Company dated July 16, 1999.

         FOR YOUR  CLIENTS WHO WISH TO TENDER  NOTES OF MORE THAN ONE SERIES,  A
SEPARATE LETTER OF TRANSMITTAL AND/OR NOTICE OF GUARANTEED  DELIVERY IS REQUIRED
FOR EACH SERIES OF NOTES TENDERED.

         WE URGE YOU TO CONTACT  YOUR  CLIENTS AS PROMPTLY AS  POSSIBLE.  PLEASE
NOTE THAT EACH OF THE OFFERS  WILL EXPIRE AT 5:00 P.M.,  NEW YORK CITY TIME,  ON
TUESDAY,  AUGUST 17, 1999 UNLESS  EXTENDED OR TERMINATED.  HOLDERS OF NOTES MUST
TENDER  THEIR  NOTES  PRIOR TO THE  APPLICABLE  EXPIRATION  TIME TO RECEIVE  THE
APPLICABLE PURCHASE PRICE.

         In all  cases,  the  applicable  Purchase  Price will be paid for Notes
accepted for purchase pursuant to the Offers only after timely receipt by United
States  Trust  Company  of  New  York  (the  "Depositary")  of  such  Notes  (or
confirmation of book-entry transfer of such Notes into the Depositary's  account
at the Book-Entry  Transfer  Facility (as defined in the Offer to Purchase)),  a
Letter of Transmittal (or facsimile),  properly  completed and validly executed,
or, if applicable,  an Agent's  Message (as defined in the Offer to Purchase) in
lieu of a Letter of Transmittal and any other required documents.

         If holders of Notes wish to tender, but it is impracticable for them to
forward  their  Notes  or  other  required  documents  prior  to the  applicable
Expiration  Time, a tender may be effected by following the guaranteed  delivery
procedures  described in the Offer to Purchase under the heading "Procedures for
Tendering Notes--Guaranteed Delivery."

         WE URGE YOU TO CONTACT YOUR CLIENTS AS PROMPTLY AS POSSIBLE IN ORDER TO
OBTAIN THEIR INSTRUCTIONS.



<PAGE>


         The Company will not pay any fees or commissions to any broker,  dealer
or other  person  (other than the  Information  Agent,  and the  Depositary)  in
connection  with  the  Offers.  However,  the  Company  will  reimburse  you for
customary mailing and handling expenses incurred by you in forwarding any of the
enclosed materials to your clients. The Company will pay or cause to be paid any
transfer  taxes  payable with respect to the transfer of Notes to it,  except as
otherwise provided in Instruction 6 of the Letter of Transmittal.

         Any  inquiries  you may have  with  respect  to the  Offers  should  be
addressed to MacKenzie  Partners,  Inc., the  Information  Agent,  or Donaldson,
Lufkin & Jenrette Securities Corporation, the Dealer Manager, at their addresses
and  telephone  numbers  set forth on the back  cover of the Offer to  Purchase.
Additional copies of the enclosed materials may be obtained from the Information
Agent.

                                                        Very truly yours,


                                                  Donaldson, Lufkin & Jenrette
                                                      Securities Corporation


         NOTHING CONTAINED HEREIN OR IN THE ENCLOSED  DOCUMENTS SHALL CONSTITUTE
YOU OR ANY OTHER PERSON THE AGENT OF THE COMPANY,  THE  INFORMATION  AGENT,  THE
DEALER  MANAGER OR ANY  AFFILIATE OF ANY OF THEM,  OR AUTHORIZE YOU OR ANY OTHER
PERSON TO USE ANY DOCUMENT OR TO MAKE ANY  STATEMENT ON BEHALF OF ANY OF THEM IN
CONNECTION WITH THE OFFERS OTHER THAN THE ENCLOSED  DOCUMENTS AND THE STATEMENTS
CONTAINED THEREIN.


                          CONCENTRA MANAGED CARE, INC.
                           OFFER TO PURCHASE FOR CASH

        ALL OF ITS OUTSTANDING 6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
                              CUSIP #: 20589T-AA-1
                                       674623-AA-1 (FORMERLY OCCUSYSTEMS, INC.)
                                       AND
       ALL OF ITS OUTSTANDING 4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003
                              CUSIP #: 20589T-AB-9
                                       20589T-AC-7

To Our Clients:

         Enclosed for your consideration is an Offer to Purchase, dated July 20,
1999 (as the same may be amended or  supplemented  from time to time, the "Offer
to  Purchase"),  and the Letter of  Transmittal  (the  "Letter of  Transmittal")
relating  to the offer by  Concentra  Managed  Care,  Inc.  (the  "Company")  to
purchase (i) all of its outstanding 6% Convertible  Subordinated  Notes due 2001
(the "6% Notes") for a cash  purchase  price of  $1,002.50  per $1000  principal
amount of 6% Notes,  plus accrued and unpaid  interest up to, but not including,
the  date of  payment  (the  "6%  Notes  Purchase  Price")  and  (ii) all of its
outstanding 4.5% Convertible  Subordinated Notes due 2003 (the "4.5% Notes" and,
together with the 6% Notes,  the "Notes") for a cash purchase price of $1,001.25
per $1000  principal  amount of 4.5% Notes,  plus accrued and unpaid interest up
to, but not including, the date of payment (the "4.5% Notes Purchase Price" and,
together with the 6% Notes Purchase Price, the "Purchase Prices").  The offer to
purchase  each  issue of Notes on the terms and  subject to the  conditions  set
forth in the Offer to Purchase and in the Letter of  Transmittal  is referred to
individually as an "Offer," and such offers with respect to both issues of Notes
are collectively referred to as the "Offers."

         WE ARE THE  HOLDER OF RECORD OF NOTES  HELD BY US FOR YOUR  ACCOUNT.  A
TENDER OF SUCH NOTES CAN BE MADE ONLY BY US AS THE HOLDER OF RECORD AND PURSUANT
TO YOUR  INSTRUCTIONS.  THE LETTER OF  TRANSMITTAL  IS FURNISHED TO YOU FOR YOUR
INFORMATION  ONLY AND CANNOT BE USED BY YOU TO TENDER  NOTES HELD BY US FOR YOUR
ACCOUNT.

         We request  instructions  as to  whether  you wish to have us tender on
your behalf any or all of the Notes held by us for your account,  upon the terms
and subject to the conditions set forth in the Offer to Purchase and the related
Letter of Transmittal.

                                       1
<PAGE>


Your attention is directed to the following:

         1. EACH OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON TUESDAY,
AUGUST 17, 1999 UNLESS EXTENDED OR TERMINATED  (SUCH TIME AND DATE OR THE LATEST
TIME AND DATE TO WHICH THE  RELEVANT  OFFER MAY BE EXTENDED OR  TERMINATED  WITH
RESPECT  TO EACH OF THE  OFFERS,  BEING  REFERRED  TO HEREIN AS THE  "EXPIRATION
TIME").  HOLDERS  OF NOTES  MUST  TENDER  THEIR  NOTES  PRIOR TO THE  APPLICABLE
EXPIRATION TIME TO RECEIVE THE APPLICABLE  PURCHASE PRICE.  TENDERS OF NOTES MAY
BE  VALIDLY  WITHDRAWN  AT ANY TIME  PRIOR TO THE  EXPIRATION  TIME AND,  UNLESS
THERETOFORE  ACCEPTED FOR PAYMENT BY THE COMPANY PURSUANT TO THE RELEVANT OFFER,
MAY ALSO BE VALIDLY WITHDRAWN AT ANY TIME AFTER TUESDAY, SEPTEMBER 14, 1999.

         2. The  Company's  obligation  to accept  for  purchase  Notes  validly
tendered and not withdrawn  pursuant to the relevant Offer is  conditioned  upon
the  consummation  of the Merger and certain other  conditions  described in the
Offer to  Purchase  under  the  headings  "Principal  Terms of the  Offers"  and
"Conditions  of the  Offers".  IN THE  EVENT  THAT AN  OFFER  IS  TERMINATED  OR
OTHERWISE NOT  COMPLETED,  NO PURCHASE  PRICE WILL BE PAID OR BECOME  PAYABLE TO
HOLDERS OF NOTES WHO HAVE TENDERED THEIR NOTES IN CONNECTION WITH SUCH OFFER.

         3.  Consummation  of  the  Offers  may  have  adverse  consequences  to
non-tendering Holders, including that the reduced amount of outstanding Notes as
a result of the Offers may adversely  affect the trading  market,  liquidity and
market price of the Notes.

         If you  wish to have us  tender  any or all of  your  Notes  please  so
instruct us by completing,  executing and returning to us the  instruction  form
contained in this letter.  If you authorize  the tender of your Notes,  all such
Notes will be tendered unless  otherwise  specified in your  instructions.  YOUR
INSTRUCTIONS  SHOULD BE  FORWARDED  TO US IN AMPLE TIME TO PERMIT US TO SUBMIT A
TENDER ON YOUR BEHALF PRIOR TO THE EXPIRATION TIME.

         The Offers are made  solely by the Offer to Purchase  and  accompanying
Letter of Transmittal and do not constitute an offer to buy or the  solicitation
of an offer  to sell  the  Notes in any  circumstances  in which  such  Offer is
unlawful.

                                       2
<PAGE>


                        INSTRUCTIONS WITH RESPECT TO THE
                          CONCENTRA MANAGED CARE, INC.
                           OFFER TO PURCHASE FOR CASH

        ALL OF ITS OUTSTANDING 6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
                                       AND
       ALL OF ITS OUTSTANDING 4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003

         The undersigned  acknowledge(s) receipt of your letter and the enclosed
Offer  to  Purchase,  dated  July  20,  1999  (as the  same  may be  amended  or
supplemented  from time to time, the "Offer to Purchase"),  and the accompanying
Letter of  Transmittal  (the "Letter of  Transmittal"),  in connection  with the
offer  by  Concentra  Managed  Care,  Inc.  to  purchase  for  cash  all  of its
outstanding 6% Convertible  Subordinated Notes due 2001 (the "6% Notes") and all
of its  outstanding  4.5%  Convertible  Subordinated  Notes due 2003 (the  "4.5%
Notes"  and,  together  with the 6%  Notes,  the  "Notes")  upon the  terms  and
conditions  set  forth in the  Offer  to  Purchase  and the  related  Letter  of
Transmittal.

         This will  instruct  you to tender the  aggregate  principal  amount of
Notes  indicated below held by you for the account or benefit of the undersigned
(or, if no amount is indicated below, for all of the aggregate  principal amount
of Notes  held by you for the  account  of the  undersigned)  upon the terms and
subject to the  conditions  set forth in the Offer to  Purchase  and the related
Letter of Transmittal.

                                       3
<PAGE>


                                     SIGN HERE

Aggregate Principal Amount of
6% Notes to be Tendered

- ---------------------------------    -------------------------------------
                                     Signature(s)

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

Aggregate Principal Amount of        _____________________________________
4.5% Notes to be Tendered            Please Type or Print Name(s)

_________________________________    Dated:___________________________, 1999

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

                                     -------------------------------------
                                     Please Type or Print Address and Zip Code

                                     -------------------------------------
                                     Area Code and Telephone Number

                                     -------------------------------------
                                     Taxpayer Identification Number (i.e.,
                                     Social Security Number or Employer
                                     Identification Number)



                                       4






             GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                          NUMBER ON SUBSTITUTE FORM W-9

GUIDELINES FOR DETERMINING THE PROPER NAME AND IDENTIFICATION NUMBER TO GIVE THE
PAYER. -- The taxpayer identification number for an individual is the
individual's social security number. Social security numbers have nine digits
separated by two hyphens: i.e., 000-00-0000. The taxpayer identification number
for an entity is the entity's employer identification number. Employer
identification numbers have nine digits separated by only one hyphen: i.e.,
00-0000000. The table below will help determine the number to give the payer.

- --------------------------------------------------------------------------------
                                         GIVE THE NAME AND TAXPAYER
 FOR THIS TYPE OF ACCOUNT:               IDENTIFICATION NUMBER OF
- --------------------------------------------------------------------------------
 1.   An individual's account            The individual

 2.   Two or more individuals            The actual owner of the
      (joint account)                    account or, if combined funds,
                                         any one of the individuals(1)

 3.   Husband and wife (joint            The actual owner of the
      account)                           account or, if joint funds,
                                         either person(1)

 4.   Custodian account of a minor       The minor(2)
      (Uniform Gift to Minors Act)
                                         The adult or, if the minor is
 5.   Adult and minor (joint             the only contributor, the
      account)                           minor(1)


 6.   Account in the name of             The ward, minor, or
 guardian or committee for a             incompetent person(3)
 designated ward, minor, or
 incompetent person

 7.  a. The usual revocable savings      The grantor-trustee(1)
        trust account (grantor is
        also trustee)

     b. So-called trust account          The actual owner(1)
        that is not a legal or
        valid trust under State law

 8.  Sole proprietorship account         The owner(4)

 9.  A valid trust, estate or            The legal entity (Do not
     pension trust                       furnish the identifying number
                                         of the personal representative
                                         or trustee unless the legal
                                         entity itself is not
                                         designated in the account
                                         title.)(5)


 10. Corporate account                   The corporation

 11. Association, club, religious,       The organization
    charitable, educational or
    other tax- exempt organization
    account

 12. Partnership account                 The partnership

 13. A broker or registered nominee      The broker or nominee

 14. Account with the Department of      The public entity
    Agriculture in the name of a
    public entity (such as a State
    or local government, school
    district, or prison) that
    receives agricultural program
    payments





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

(1)  List first and circle the name of the person whose number you furnish.
(2)  Circle the minor's name and furnish the minor's social security number.
(3)  Circle the ward's, minor's or incompetent person's name and furnish such
     person's social security number.
(4)  Show the name of the owner.
(5)  List first and circle the name of the legal trust, estate, or pension
     trust.

NOTE: If no name is circled when there is more than one name, the number will be
      considered to be that of the first name listed.

OBTAINING A NUMBER

If you do not have a  taxpayer  identification  number  or you do not know  your
number, obtain Form SS-5,  Application for a Social Security Card, or Form SS-4,
Application  for  Employer  Identification  Number,  at the local  office of the
Social Security  Administration  or the Internal Revenue Service (the "IRS") and
apply for a number.



PAYEES EXEMPT FROM BACKUP WITHHOLDING



 Payees specifically exempted from backup withholding on ALL broker
 transactions and interest and dividend payments include the following:

|X|   A corporation.
|X|   A financial institution.
|X|   An  organization  exempt  from tax under  section  501(a) of the  Internal
      Revenue Code of 1986, as amended (the "Code"), or an individual retirement
      plan.
|X|   The United States or any agency or instrumentality thereof.
|X|   A State, the District of Columbia,  a possession of the United States,  or
      any subdivision or instrumentality thereof.
|X|   A foreign government, a political subdivision of a foreign government,  or
      any agency or instrumentality thereof.
|X|   An international organization or any agency or instrumentality thereof.
|X|   A dealer in securities or commodities  required to register in the U.S. or
      a possession of the U.S.
|X|   A real estate investment trust.
|X|   A common trust fund operated by a bank under section 584(a) of the Code.
|X|   An entity  registered  at all times  under the  Investment  Company Act of
      1940.
|X|   A foreign central bank of issue.


 Payments of dividends  and patronage  dividends not generally  subject
 to backup withholding including the following:

|X|   Payments to nonresident aliens subject to withholding under section 1441.
|X|   Payments  to  partnerships  not engaged in a trade or business in the U.S.
      and which have at least one non-resident alien partner.
|X|   Payments of patronage dividends not paid in money.
|X|   Payments made by certain foreign organizations.


 Payments of interest not generally subject to backup withholding
 include the following:
|X|   Payments of interest on obligations issued by individuals.
|X|   Payments of tax-exempt interest (including exempt-interest dividends under
      section 852 of the Code).
|X|   Payments described in Code section 6049(b) (5) to non-resident aliens.
|X|   Payments on tax-free covenant bonds under section 1451 of the Code.
|X|   Payments made by certain foreign organizations.


 Exempt payees  described  above should file Form W-9 to avoid possible
 erroneous  backup  withholding.  ENTER  YOUR  TAXPAYER  IDENTIFICATION
 NUMBER,  WRITE  "EXEMPT"  ON THE FACE OF THE  FORM,  SIGN AND DATE THE
 FORM AND RETURN IT TO THE PAYER.


PRIVACY ACT NOTICE.  -- Section  6109  requires  most  recipients  of  dividend,
interest,  or other payments to give taxpayer  identification  numbers to payers
who  must  report  the  payments  to the  IRS.  The IRS  uses  the  numbers  for
identification  purposes  and to help  verify the  accuracy  of your tax return.
Payers must be given the numbers  whether or not recipients are required to file
tax returns.  Payers must generally withhold 31% of taxable interest,  dividend,
and  certain  other  payments  to a  payee  who  does  not  furnish  a  taxpayer
identification number to a payer. Certain penalties may also apply.

 PENALTIES

(1)   PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER. -- If you
      fail to furnish your taxpayer identification number to a payer, you are
      subject to a penalty of $50 for each such failure unless your failure is
      due to reasonable cause and not to willful neglect.

(2)   CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING. -- If you
      make a false statement with no reasonable basis which results in no
      imposition of backup withholding, you are subject to a penalty of $500.

(3)   CRIMINAL PENALTY FOR FALSIFYING INFORMATION. -- Willfully falsifying
      certifications or affirmations may subject you to criminal penalties
      including fines and/or imprisonment.

              FOR ADDITIONAL INFORMATION CONTACT YOUR TAX
              CONSULTANT OR THE INTERNAL REVENUE SERVICE.



















         THIS ANNOUNCEMENT IS NEITHER AN OFFER TO PURCHASE NOR A SOLICITATION OF
         AN OFFER TO SELL ANY OF THE NOTES (AS  DEFINED  BELOW).  THE OFFERS (AS
         DEFINED BELOW) ARE MADE SOLELY BY THE OFFER TO PURCHASE, DATED JULY 20,
         1999, AND THE ACCOMPANYING  LETTER OF TRANSMITTAL AND IS NOT BEING MADE
         TO (NOR WILL TENDERS BE ACCEPTED FROM OR ON BEHALF OF) HOLDERS OF NOTES
         IN ANY  JURISDICTION  IN WHICH THE MAKING OF AN OFFER OR THE ACCEPTANCE
         THEREOF WOULD NOT BE IN COMPLIANCE WITH THE LAWS OF SUCH  JURISDICTION.
         IN ANY  JURISDICTION  THE  SECURITIES,  BLUE SKY OR OTHER LAWS OF WHICH
         REQUIRE THE OFFER TO BE MADE BY A LICENSED BROKER OR DEALER,  THE OFFER
         SHALL BE DEEMED MADE ON BEHALF OF THE COMPANY BY THE DEALER  MANAGER OR
         ONE OR MORE  REGISTERED  BROKERS OR DEALERS  LICENSED UNDER THE LAWS OF
         SUCH JURISDICTION.

                          CONCENTRA MANAGED CARE, INC.

                      NOTICE OF OFFER TO PURCHASE FOR CASH
       ALL OF ITS OUTSTANDING 6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
                                      AND
      ALL OF ITS OUTSTANDING 4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003


         Concentra  Managed Care, Inc., a Delaware  corporation (the "Company"),
is offering to purchase,  upon the terms and subject to the conditions set forth
in the Offer to Purchase  (as  amended or  supplemented  from time to time,  the
"Offer to Purchase ") and in the accompanying Letter of Transmittal (the "Letter
of Transmittal"),  (i) all of its outstanding 6% Convertible  Subordinated Notes
due 2001 (the "6%  Notes") for a cash  purchase  price of  $1,002.50  per $1,000
principal  amount of 6% Notes,  plus accrued and unpaid  interest up to, but not
including,  the date of payment and (ii) all of its outstanding 4.5% Convertible
Subordinated  Notes due 2003 (the "4.5% Notes" and,  together with the 6% Notes,
the "Notes") for a cash purchase price of $1,001.25 per $1,000  principal amount
of 4.5% Notes,  plus accrued and unpaid  interest up to, but not including,  the
date of  payment.  The offer to  purchase  each  issue of Notes on the terms and
subject to the  conditions  set forth herein and in the Letter of Transmittal is
referred to  individually  as an "Offer,"  and such offers with  respect to both
issues of Notes are collectively referred to as the "Offers."

         Each Offer is subject to certain  conditions,  including,  among  other
things,  the  consummation of the Merger (as defined  below),  and certain other
conditions described in the Offer to Purchase . The purchase of the Notes is not
a condition to the Merger. Each Offer is independent of the other.

         The Offers are being made in connection  with the proposed  merger (the
"Merger") of Yankee Acquisition Corp., a Delaware  corporation  ("Yankee") and a
wholly  owned  subsidiary  of Welsh,  Carson,  Anderson & Stowe  VIII,  L.P.,  a
Delaware limited partnership with and into the Company,  pursuant to the Amended
and Restated  Agreement and Plan of Merger,  dated as of March 24, 1999, between
Yankee and the Company.




<PAGE>



EACH OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON TUESDAY,  AUGUST 17,
1999 UNLESS  EXTENDED OR  TERMINATED  (SUCH TIME AND DATE OR THE LATEST TIME AND
DATE TO WHICH THE RELEVANT  OFFER MAY BE EXTENDED OR TERMINATED  WITH RESPECT TO
EACH OF THE OFFERS , BEING  REFERRED TO AS THE  "EXPIRATION  TIME").  HOLDERS OF
NOTES MUST TENDER THEIR NOTES PRIOR TO THE APPLICABLE EXPIRATION TIME TO RECEIVE
THE APPLICABLE PURCHASE PRICE.  TENDERS OF NOTES MAY BE VALIDLY WITHDRAWN AT ANY
TIME PRIOR TO THE EXPIRATION TIME AND, UNLESS  THERETOFORE  ACCEPTED FOR PAYMENT
BY THE COMPANY PURSUANT TO THE RELEVANT OFFER, MAY ALSO BE VALIDLY  WITHDRAWN AT
ANY TIME AFTER TUESDAY, SEPTEMBER 14, 1999.

         For purposes of each Offer, the Company will be deemed to have accepted
for purchase Notes validly tendered (and not validly withdrawn) pursuant to that
Offer (or  defectively  tendered  Notes with  respect to which the  Company  has
waived any defects) if, as and when the Company gives oral notice  (confirmed in
writing) or written  notice  thereof to the United  States Trust  Company of New
York (the  "Depositary").  Payment for Notes accepted for purchase in the Offers
will be made by the  Company  by  promptly  depositing  such  payment  with  the
Depositary,  which will act as agent for the tendering  holders of Notes for the
purpose of receiving the relevant  purchase price and  transmitting the relevant
purchase  price to such  holders  of  Notes.  In all  cases,  payment  for Notes
accepted  for  purchase  pursuant  to an Offer  will be made only  after  timely
receipt  by  the  Depositary  of  certificates  for  the  applicable  Notes  (or
confirmation  of book-entry  transfer),  a properly  completed and duly executed
Letter of Transmittal  related thereto (or a manually  signed  facsimile) or, if
applicable, an Agent's Message (as defined in the Offer to Purchase ) in lieu of
a Letter of Transmittal and any other documents required thereby. Upon the terms
and subject to the conditions of the Offers , delivery of the purchase price for
Notes  accepted  for  purchase  pursuant  to the  Offers  will  be  made  by the
Depositary promptly after its receipt of funds for the payment of such Notes.

         Each of the Offers  will  expire at 5:00 p.m.,  New York City time,  on
Tuesday,  August 17, 1999, unless extended by the Company in its sole discretion
or terminated earlier. The Company expressly reserves the right to extend either
or both of the Offers on a daily  basis or for such  period or periods as it may
determine  in its sole  discretion  from time to time by giving  written or oral
notice to the Depositary and by making an  announcement  by press release to the
Dow Jones News Service or other public announcement prior to 9:00 a.m., New York
City time, on the next business day following the relevant previously  scheduled
Expiration Time for such extended Offer.  During any extension of an Offer,  all
Notes  previously  tendered  and not  withdrawn  pursuant  to that Offer and not
accepted for purchase will remain subject to that Offer and may,  subject to the
terms and  conditions  of the Offer to Purchase and the  accompanying  Letter of
Transmittal, be accepted for purchase by the Company.

         Holders of Notes who wish to exercise  their right of  withdrawal  with
respect to an Offer must give written  notice of  withdrawal  delivered by mail,
hand delivery or manually signed  facsimile  transmission,  which notice must be
timely received by the Depositary at one of its addresses set forth in the Offer
to Purchase . In order to be valid, a notice of withdrawal  must (i) specify the
name of the person who  deposited the Notes to be withdrawn  (the  "Depositor"),
the name in which  the Notes are  registered  (or,  if  tendered  by  book-entry
transfer,  the name of the participant in the Book-Entry  Transfer  Facility (as
defined in the Offer to  Purchase ) whose  name  appears on a security  position
listing as the owner of such Notes),  if different  from that of the  Depositor,
(ii) specify the principal  amount of Notes to be withdrawn,  (iii) be signed by
the  Depositor  in the same manner as the  original  signature  on the Letter of
Transmittal (including,  in any case, any required signature guarantee(s)) or be
accompanied by evidence  satisfactory to the Company and the Depositary that the
person withdrawing the tender has succeeded to the beneficial  ownership of such
Notes and (iv) be timely  received by the Depositary at one of its addresses set
forth in the  Offer  to  Purchase  . If  certificates  have  been  delivered  or
otherwise identified (through confirmation of book-entry transfer of such Notes)
to the Depositary, the name of the holder of Notes and the certificate number or
numbers  relating  to  such  withdrawn  Notes  must  also  be  furnished  to the
Depositary as

                                       2

<PAGE>


aforesaid prior to the physical  release of the  certificates  for
the  withdrawn  Notes  (or,  in the  case of  Notes  transferred  by  book-entry
transfer, the name and number of the account at the Book-Entry Transfer Facility
to be credited with withdrawn Notes).

         The Offer to Purchase and the  accompanying  Letter of Transmittal will
be mailed to  registered  holders of Notes and  furnished  to brokers,  dealers,
banks,  trust  companies and similar  persons whose names, or the names of whose
nominees, appear on the Company's stockholder lists, or, if applicable,  who are
listed as participants in a clearing  agency's  security  position  listings for
subsequent transmittal to beneficial owners of Notes.

         The information  required to be disclosed by Rule  13(e)-4(d)(1)  under
the  Securities  Exchange Act of 1934, as amended,  is contained in the Offer to
Purchase and is incorporated herein by reference.

         The Offer to Purchase  contains  important  information which should be
read before any decision is made with respect to the Offers.

         Requests for copies of the Offer to Purchase, the Letter of Transmittal
and all other tender offer materials may be directed to the Information Agent as
set forth below, and copies will be furnished at the Company's expense.  No fees
or commissions will be payable to brokers,  dealers or other persons (other than
the Dealer Manager and the  Information  Agent) for soliciting  tenders of Notes
pursuant to the Offers.


                    The Information Agent for the Offers is:

                           [MacKenzie Partners Logo]
                                156 Fifth Avenue
                            New York, New York 10010
                            (212) 929-5500 (Collect)
                                       or
                         CALL TOLL-FREE (800) 322-2855


                     The Dealer Manager for the Offers is:

                          Donaldson, Lufkin & Jenrette
                                277 Park Avenue
                            New York, New York 10172
                    CALL TOLL-FREE (800) 255-9260, EXT. 4131



July 20, 1999

                                       3

Contact: Thomas E. Kiraly
                  Executive Vice President and
                  Chief Financial Officer
                  (617) 367-2163, Ext. 5101


                 CONCENTRA MANAGED CARE COMMENCES TENDER OFFERS
               FOR ITS 6% CONVERTIBLE SUBORDINATED NOTES DUE 2001
              AND ITS 4.5% CONVERTIBLE SUBORDINATED NOTES DUE 2003


         BOSTON,   Mass.  (July  20,  1999)  -  Concentra   Managed  Care,  Inc.
(Nasdaq/NM:  CCMC)  ("Concentra"  or the "Company")  today announced that it has
commenced  tender  offers to  purchase  all of its  outstanding  6%  Convertible
Subordinated  Notes due 2001 for a cash  purchase  price of $1,002.50 per $1,000
principal amount of such notes,  plus accrued and unpaid interest up to, but not
including,  the date of  payment  and all of its  outstanding  4.5%  Convertible
Subordinated  Notes due 2003 for a cash  purchase  price of $1,001.25 per $1,000
principal amount of such notes,  plus accrued and unpaid interest up to, but not
including, the date of payment.

         The tender  offers  will  expire at 5:00 p.m.,  New York City time,  on
Tuesday, August 17, 1999, unless extended.

         Donaldson  Lufkin  &  Jenrette  is the  Dealer  Manager  and  MacKenzie
Partners is the Information Agent for the tender offers.

         Concentra  Managed  Care  is the  leading  provider  and  comprehensive
outsource  solution for cost containment and fully integrated care management in
the  occupational,   auto,  and  group  healthcare  markets.   Concentra  offers
prospective and  retrospective  services to employers and insurers of all sizes,
providing  pre-employment  testing,  loss prevention  services,  first report of
injury, injury care, specialist networks and specialized cost containment to the
disability and automobile  injury markets.  Currently,  the Company operates the
nation's  largest  network of  occupational  healthcare  centers,  managing  the
practices of approximately  334 physicians  located in 188 centers in 55 markets
in 29 states.  The  Company has  approximately  1,100  field case  managers  who
provide  medical  management  and  return to work  services  in 49  states,  the
District of Columbia, and Canada. The Company also has 84 service locations that
provide specialized cost containment services including utilization  management,
telephonic case management,  first notice of loss reporting,  and  retrospective
bill review.

         This news release is neither an offer to purchase nor a solicitation of
an offer to sell securities.

                                      -END-


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