Document:

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                                                                  EXHIBIT 10.4

                        RESTRICTED STOCK AWARD AGREEMENT

         THIS RESTRICTED STOCK AWARD AGREEMENT dated as of this 19th day of May,
2000 (the "Agreement"), between OneSource Med, Inc., a Delaware corporation (the
"Company"), an indirect subsidiary of Columbia/HCA Healthcare Corporation
("Columbia/HCA", and together with its direct and indirect subsidiaries, a
"Related Entity") and (the "Grantee").

                                    RECITALS

         WHEREAS, the Company has awarded Grantee shares (the "Shares") of the
authorized but unissued common stock, $.001 par value, of the Company (the
"Common Stock") pursuant to the terms of the Columbia/HCA Healthcare Corporation
2000 Incentive and Retention Plan (the "Plan"); and

         WHEREAS, the Plan contemplates a written document evidencing the award;

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants contained in this Agreement and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, and
intending to be legally bound, the parties agree as follows:

                                    ARTICLE I

                                 AWARD OF SHARES

         1.1 Award. Pursuant to the terms of the Plan the Grantee is hereby
awarded such number of shares of the Company's Common Stock set forth beside the
Grantee's name on Schedule I.

         1.2 Delivery of Certificates. The certificates representing the Shares
hereunder shall be held in escrow by the Secretary of the Company as provided in
Article VII hereof.

         1.3 Stockholder Right. Until such time as any or all of Grantee's
Shares are forfeited pursuant to the terms of this Agreement, if ever, the
Grantee (or any successor in interest) shall have all the rights of a
stockholder (including voting rights) with respect to the Shares, including
Shares held in escrow under Article VII, subject, however, to the transfer
restrictions of Article IV.

                                   ARTICLE II

                            SECURITIES LAW COMPLIANCE

         2.1 Exemption from Registration. Grantee acknowledges that the Shares
have not been registered under the Securities Act of 1933, as amended (the "1933
Act"), and are being issued to the Grantee in reliance upon an exemption from
the registration requirements thereof.

         2.2 Restricted Securities. Grantee hereby confirms that he has been
informed that the Shares are restricted securities under the 1933 Act and may
not be resold or transferred unless the

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Shares are first registered under the federal securities laws or unless an
exemption from such registration is available. Accordingly, Grantee hereby
acknowledges that Grantee is prepared to hold the Shares for an indefinite
period and that Grantee is aware that Rule 144 of the Securities and Exchange
Commission issued under the 1933 Act is not presently available to exempt the
sale of the Shares from the registration requirements of the 1933 Act.

          2.3 Disposition Of Shares. Grantee hereby agrees that Grantee shall
make no disposition of the Shares (other than a permitted transfer under Section
4.1) unless and until Grantee:

              a. shall have notified the Company of the proposed disposition
and provided a written summary of the terms and conditions of the proposed
disposition; and

              b. shall have complied with all requirements of this Agreement
applicable to the disposition of the Shares (as well as any other applicable
agreement, including, without limitation, that certain Stockholders Agreement
dated as of May 19, 2000 (the "Stockholders Agreement") among the Company,
Grantee and certain other holders of the Company's capital stock).

              The Company shall not be required (i) to transfer on its books
any Shares which have been sold or transferred in violation of the provisions of
this Article II, nor (ii) to treat as the owner of the Shares, or otherwise to
accord voting or dividend rights to, any transferee to whom the Shares have been
transferred in contravention of this Agreement. Grantee agrees to pay the
Company's reasonable expenses incurred in connection with any disposition of the
Shares.

          2.4 Restrictive Legends. In order to reflect the restrictions on
disposition of the Shares, the stock certificates for the Shares will be
endorsed with the following restrictive legend:

              "THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER
              THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"),
              OR ANY STATE BLUE SKY LAWS, AND MAY NOT BE OFFERED, SOLD,
              TRANSFERRED, ASSIGNED, PLEDGED OR HYPOTHECATED ABSENT AN EFFECTIVE
              REGISTRATION THEREOF UNDER SUCH ACT AND THE APPLICABLE BLUE SKY
              LAWS OR COMPLIANCE WITH RULE 144 PROMULGATED UNDER THE ACT, OR
              UNLESS THE COMPANY HAS RECEIVED AN OPINION OF COUNSEL,
              SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH
              REGISTRATION IS NOT REQUIRED. THE SECURITIES REPRESENTED HEREBY
              ARE SUBJECT TO, AND MAY BE TRANSFERRED ONLY IN COMPLIANCE WITH,
              THAT CERTAIN RESTRICTED STOCK AWARD AGREEMENT, DATED AS OF MAY 19,
              2000, BETWEEN THE COMPANY AND THE HOLDER OF

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              THESE SECURITIES, AND THAT CERTAIN STOCKHOLDERS AGREEMENT DATED AS
              OF MAY 19, 2000, COPIES OF WHICH MAY BE OBTAINED AT THE PRINCIPAL
              EXECUTIVE OFFICE OF THE COMPANY."

                                   ARTICLE III

                              SPECIAL TAX ELECTION

         3.1 Section 83(b) Election. The Grantee understands that under
Section 83 of the Internal Revenue Code of 1986, as amended (the "Code"), the
fair market value of the Shares on the date any forfeiture restrictions
applicable to such Shares lapse will be reportable as ordinary income to the
Grantee in the tax year in which such restrictions lapse. For this purpose, the
term "forfeiture restrictions" includes the automatic forfeiture of Unvested
Shares (as hereinafter defined) as provided in Article V hereof. The Grantee
understands, however, that he may elect to be taxed at the time the Shares are
acquired hereunder, rather than when and as such Shares cease to be subject to
such forfeiture restrictions, by filing an irrevocable election under Section
83(b) of the Code with the Internal Revenue Service within thirty (30) days
after the date of this Agreement. If this irrevocable election is made, the
Grantee will be taxed on the fair market value of the Shares as of the date of
this Agreement (determined without taking into account any forfeiture
restrictions). The form for making this irrevocable election is attached as
Exhibit A hereto. In the event that the Grantee makes this irrevocable election,
and the Grantee's Unvested Shares are forfeited pursuant to Article V hereof,
the Grantee will not be entitled to deduct the income, if any, previously
recognized as income with respect to those shares as a result of the election.
The Grantee understands that failure to make this filing within the thirty (30)
day period will result in the recognition of ordinary income by the Grantee as
the forfeiture restrictions lapse. THE GRANTEE ACKNOWLEDGES THAT IT IS GRANTEE'S
SOLE RESPONSIBILITY, AND NOT THE COMPANY'S, TO FILE A TIMELY ELECTION UNDER
SECTION 83(b), EVEN IF GRANTEE REQUESTS THE COMPANY OR ITS REPRESENTATIVES TO
MAKE THIS FILING ON SUCH GRANTEE'S BEHALF.

         This summary is necessarily incomplete, and the tax laws and
regulations are subject to change. The Grantee should consult a tax advisor
before making an election under Section 83(b).

                                   ARTICLE IV

                              TRANSFER RESTRICTIONS

         4.1 Restriction on Transfer. The Grantee shall not transfer, assign,
encumber, or otherwise dispose of any Unvested Shares at any time. Any transfer,
assignment, encumbrance or other disposition of Vested Shares (as hereinafter
defined) shall be subject to the provisions of the Stockholders Agreement.
Subject to Section 4.2 hereof, such restrictions on transfer, however, shall

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not be applicable to any transfer to or for the benefit of (i) any spouse,
parent, child, grandchild, or lineal descendant (including adopted children and
stepchildren) of the Grantee (including, without limitation, trustee(s) of a
trust for the benefit of the Grantee or any of the foregoing); (ii) any trustee
of a voting trust for purposes of transferring shares into such voting trust; or
(iii) any legal representative, devisee, or heir of the Grantee upon his or her
death.

         4.2 Transferee Obligations. Each person (other than the Company) to
whom the Shares are transferred by means of one of the permitted transfers
specified in Section 4.1 must, as a condition precedent to the validity of such
transfer, acknowledge in writing to the Company that such person is bound by the
provisions of this Agreement to the same extent that such shares would be so
subject if retained by the Grantee.

         4.3 "Market Stand-Off" Agreement. The Grantee hereby agrees that,
during the period of duration specified by the Company and an underwriter of
common stock or other securities of the Company, following the date, if any, of
the first sale to the public pursuant to a registration statement of the Company
filed under the 1933 Act, Grantee shall not, to the extent requested by the
Company and such underwriter, directly or indirectly sell, offer to sell,
contract to sell (including, without limitation, any short sale), grant any
option to purchase or otherwise transfer or dispose of (other than to donees who
agree to be similarly bound) any securities of the Company held by Grantee at
any time during such period except common stock included in such registration;
provided, however, that:

              (a) such agreement shall be applicable only to the first two
such registration statements of the Company which cover common stock (or other
securities convertible into common stock) to be sold on its behalf to the public
in an underwritten offering;

              (b) all executive officers and directors of the Company enter into
similar agreements; and

              (c) such market stand-off time period shall not exceed 180 days.

         In order to enforce the foregoing covenant, the Company may impose
stop-transfer instructions with respect to the securities of the Grantee (and
the shares or securities of every other person subject to the foregoing
restriction) until the end of such period.

         Notwithstanding the foregoing, the obligations described in this
Section 4.3 shall not apply to a registration relating solely to employee
benefit plans on Form S-8 or similar forms which may be promulgated in the
future, or a registration relating solely to a Commission Rule 145 transaction
or Form S-4 or similar forms which may be promulgated in the future.

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                                    ARTICLE V

                          FORFEITURE OF UNVESTED SHARES

         5.1 Forfeiture. Upon termination of the Grantee's employment with a
Related Entity, for any reason, all or any portion of the Grantee's Shares in
which the Grantee has not acquired a vested interest in accordance with the
vesting provisions set forth in Schedule II (such shares to be hereinafter
called the "Unvested Shares") will be forfeited and the Grantee shall have no
further rights with respect to such Unvested Shares.

         5.2 Vesting. Unvested Shares shall cease to be Unvested Shares and
shall cease to be subject to forfeiture, but shall remain subject to repurchase
as provided in Article VI, and the Grantee shall thereupon acquire a vested
interest therein (such shares to be hereinafter called the "Vested Shares") as
set forth on Schedule II.

         5.3 Additional Shares or Substituted Securities. In the event of any
stock dividend, stock split, recapitalization or other change affecting the
Company's outstanding Common Stock as a class effected without receipt of
consideration, then any new, substituted, or additional securities or other
property (including money paid other than as a regular cash dividend) which is
by reason of any such transaction distributed with respect to the Shares shall
be immediately subject to forfeiture as provided in this Article V, but only to
the extent the Shares are at the time subject to forfeiture. Appropriate
adjustments to reflect the distribution of such securities or property shall be
made to the number of Shares hereunder.

                                   ARTICLE VI

                        RIGHT TO REPURCHASE VESTED SHARES

         6.1 Vested Share Repurchase Right. The Company (or its assignees) is
hereby granted the right (the "Vested Share Repurchase Right") exercisable at
any time during the sixty (60)-day period following the termination of the
Grantee's employment with a Related Entity, to repurchase all or any portion of
the Grantee's Vested Shares. If the Grantee's employment with a Related Entity
is terminated by a Related Entity for "Cause" (as defined), the price per share
payable by the Company for such Vested Shares shall be the lesser of $9.31 or
"Market Value" (as defined). For purposes of this Agreement, "Cause" shall mean
the Grantee's fraud, embezzlement, defalcation, gross negligence in the
performance or nonperformance of the Grantee's duties, or failure or refusal to
perform the Grantee's duties (other than as a result of disability) at any time
while in the employ of a Related Entity. If the Grantee's employment with a
Related Entity is terminated for any other reason (including, without
limitation, death, disability, expiration of term, a Related Entity's
termination of the Grantee without Cause or voluntarily by the Grantee), the
price per share payable by the Company for such Vested Shares shall be "Market
Value" (as defined). For purposes of this Agreement, Grantee's employment shall
be deemed to have been terminated by reason of "disability" if Grantee has
become disabled within the meaning of Section 22(e)(3) of the Code. For purposes
of this Agreement, on any valuation date (the "Valuation Date") (which shall be
the date of termination of Grantee's employment for purposes of this Agreement),
the "Market Value" of each Share means the average of the closing prices of the
Common Stock on all securities exchanges on which the Common Stock may at the
time be listed or, if there have been no sales on any such

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exchange on the such Valuation Date, the average of the highest bid and lowest
asked prices on all such exchanges at the end of the Valuation Date, or, if the
Common Stock is not so listed, the average of the representative bid and asked
prices quoted in the NASDAQ System as of 4:00 p.m., New York time, on the
Valuation Date or, if on such day the Common Stock is not quoted in the NASDAQ
System, the average of the highest bid and lowest asked prices on the Valuation
Date in the domestic over-the-counter market as reported by the National
Quotation Bureau Incorporated, or any similar successor organization, in each
such case averaged over a period of 21 days consisting of the Valuation Date and
the 20 consecutive business days prior to such day. If on the Valuation Date the
Common Stock is not listed on any securities exchange or quoted in the NASDAQ
System or the over-the-counter market, the Market Value of each share of such
Shares shall be the fair market value of a share of the Common Stock as of the
Valuation Date, as reasonably determined by the board of directors of the
Company.

          6.2 Exercise of the Repurchase Right. The Vested Share Repurchase
Right shall be exercisable by written notice delivered to the Grantee prior to
the expiration of the applicable sixty (60)-day period specified in Section 6.1.
The notice shall indicate the number of Vested Shares to be repurchased and the
date on which the repurchase is to be effected, such date to be not more than
forty-five (45) days after the date of notice. The Company shall concurrently
with the receipt of the stock certificates from the Grantee, pay to the Grantee
in cash the amount set forth in Section 6.1.

          6.3 Additional Shares or Substituted Securities. In the event of any
stock dividend, stock split, recapitalization or other change affecting the
Company's outstanding Common Stock as a class effected without receipt of
consideration, then any new, substituted, or additional securities or other
property (including money paid other than as a regular cash dividend) which is
by reason of any such transaction distributed with respect to the Shares shall
be immediately subject to the Vested Share Repurchase Right, but only to the
extent the Shares are at the time covered by such right. Appropriate adjustments
to reflect the distribution of such securities or property shall be made to the
number of Shares hereunder and to the price per share to be paid upon the
exercise of the Vested Share Repurchase Right in order to reflect the effect of
any such transaction upon the Company's capital structure; provided, however,
that the aggregate purchase price shall remain the same.

                                   ARTICLE VII

                           ESCROW FOR UNVESTED SHARES

          7.1 Deposit. Upon issuance, the certificates for the Unvested Shares
shall be deposited in escrow with the Company to be held in accordance with the
provisions of this Article VII. The deposited certificates, together with any
other assets or securities from time to time deposited with the Company pursuant
to the requirements of this Agreement, shall remain in escrow until such time or
times as the certificates (or other assets and securities) are to be released or
otherwise surrendered for cancellation in accordance with Section 7.3.

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           7.2 Recapitalization. Any cash dividends on the Shares (or other
securities at the time held in escrow) shall be paid directly to the Grantee and
shall not be held in escrow. However, in the event of any stock dividend, stock
split, recapitalization, or other change affecting the Company's outstanding
Common Stock as a class effected without receipt of consideration, any new,
substituted, or additional securities or other property which is by reason of
such event distributed with respect to the Shares shall be immediately delivered
to the Company to be held in escrow under this Article VII, but only to the
extent the Shares are at the time subject to the escrow requirements of Section
7.1.

           7.3 Release/Surrender. The Shares, together with any other assets or
securities held in escrow hereunder, shall be subject to the following terms and
conditions relating to their release from escrow or their surrender to the
Company for repurchase and cancellation:

               (i) Should the Grantee's Unvested Shares be forfeited as provided
in Article V hereof, then the escrowed certificates for such Unvested Shares
(together with any other assets or securities issued with respect thereto) shall
be delivered to the Company for cancellation, and the Grantee shall cease to
have any further rights or claims with respect to such Unvested Shares (or other
assets or securities).

               (ii) As the interest of the Grantee in Shares (or any other
assets or securities issued with respect thereto) vests in accordance with the
provisions of Schedule II, the certificates for such Vested Shares (as well as
all other vested assets and securities) shall be released promptly from escrow
and delivered to the Grantee.

               (iii) All Shares (or other assets or securities) released from
escrow in accordance with the provisions of subsection (ii) above shall
nevertheless remain subject to (i) the restriction on transfer referenced in the
second sentence of Section 4.1, (ii) the market stand-off provisions of Section
4.3, and (iii) the Vested Share Repurchase Right of Section 6.1.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

           8.1 No Employment or Service Contract. Nothing in this Agreement
shall confer upon the Grantee any right to employment with the Company or a
Related Entity.

           8.2 Notices. All notices, requests, demands, and other
communications under this Agreement shall be in writing and shall be deemed to
have been duly given on the date of service if served personally on the party to
whom notice is to be given, on the date of transmittal of services via telecopy
to the party to whom notice is to be given (with a confirming copy being
delivered within 24 hours thereafter), or on the third day after mailing if
mailed to the party to whom notice is to be given, by first class mail,
registered or certified, postage prepaid, or via overnight courier providing a
receipt and properly addressed as set forth on Schedule I hereto. Any party may
change

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its address for purposes of this Section by giving notice of the new address to
each of the other parties in the manner set forth above.

           8.3 No Waiver. No waiver of any breach or condition of this
Agreement shall be deemed to be a waiver of any other or subsequent breach or
condition, whether of like or different nature.

           8.4 Cancellation of Shares. If the Company (or its assignees) shall
make available, at the time and place and in the amount and form provided in
this Agreement, the consideration for the Vested Shares to be repurchased in
accordance with Article VI of this Agreement, then from and after such time, the
person from whom such shares are to be repurchased shall no longer have any
rights as a holder of such shares (other than the right to receive payment of
such consideration in accordance with Article VI of this Agreement), and such
shares shall be deemed purchased in accordance with the applicable provisions
hereof and the Company (or its assignees) shall be deemed the owner and holder
of such shares, whether or not the certificates therefor have been delivered as
required by this Agreement.

                                   ARTICLE IX

                            MISCELLANEOUS PROVISIONS

           9.1 Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of the State of Tennessee for all purposes and in
all respects, without giving effect to the conflict of law provisions thereof.

           9.2 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original and enforceable
against the parties actually executing such counterparts, but all of which
together shall constitute one and the same instrument.

           9.3 Successors and Assigns. The provisions of this Agreement shall
inure to the benefit of, and be binding upon, the Company and its successors and
assigns and the Grantee and the Grantee's legal representatives, heirs,
legatees, distributees, assigns and transferees by operation of law, whether or
not any such person shall have become a party to this Agreement and have agreed
in writing to join herein and be bound by the terms and conditions hereof.

           9.4 Integration; Amendment. This Agreement, the Plan and the other
documents delivered pursuant hereto constitute the full and entire understanding
and agreement among the parties with regard to the subjects hereof and thereof,
and supersede any previous agreement or understanding between or among the
parties with respect to such subjects. No party shall be liable or bound to any
other party in any manner by any warranties, representations or covenants except
as specifically set forth herein or therein. Except as expressly provided herein
neither this Agreement nor any term hereof may be amended, waived, discharged or
terminated other than by a written instrument signed by the party against whom
enforcement of any such amendment, waiver, discharge or termination is sought.

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         9.5 Severability. In the event that any provision of this Agreement
becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement shall continue in full force and effect
without said provision; provided that no such severability shall be effective if
it materially changes the economic benefit of this Agreement to any party.

         9.6 Titles and Subtitles. The titles and subtitles used in this
Agreement are used for convenience only and are not considered in construing or
interpreting this Agreement.

         9.7 Termination. The provisions of Article VI and Sections 4.1 and 4.2
shall terminate 180 days following a firm commitment underwritten initial public
offering of the Company's Common Stock.

         IN WITNESS WHEREOF, the parties have executed this Agreement on the day
and year first indicated above.

                                   ONESOURCE MED, INC.

                                   By:
                                      -----------------------------------------
                                   Title:
                                         --------------------------------------

                                   GRANTEE

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

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                                   SCHEDULE I

<TABLE>
<CAPTION>

GRANTEE                         NUMBER OF SHARES AWARDED SUBJECT TO FORFEITURE
-------                         ----------------------------------------------

<S>                             <C>

</TABLE>

ONESOURCE MED, INC.
One Park Plaza
Nashville, Tennessee 37203
Attention: President

<PAGE>   11

                                   SCHEDULE II

                                     VESTING

         The forfeiture provisions in Article V shall automatically terminate
with respect to the Shares and such Unvested Shares shall become "Vested Shares"
in four equal annual installments consisting of 25% of the original number of
Unvested Shares (as may be adjusted pursuant to Section 5.3) each and beginning
on the first anniversary of the date of grant, unless otherwise determined by
the Company or by the Board of Directors of Columbia/HCA or the committee of its
Board of Directors responsible for administering the Plan.

                              ROUNDING CONVENTIONS

         For purposes of calculating any Share amounts pursuant to the foregoing
formula, the applicable number of Shares shall be rounded to the nearest whole
number.

<PAGE>   12
                                    EXHIBIT A

                           SECTION 83(B) TAX ELECTION

This statement is being made under Section 83(b) of the Internal Revenue Code,
pursuant to Treas. Reg. Section 1.83-2.

(1)     The taxpayer who performed the services is:

        Name:
                   -----------------------

        Address:
                   -----------------------

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

        Taxpayer Social Security No.:
                                      --------------------

        Taxable Year: Calendar Year 2000

(2)     The property with respect to which the election is being made is ______
        shares of the common stock, par value $0.001 per share, of OneSource
        Med, Inc. (the "Unvested Shares").

(3)     The Unvested Shares were granted on May 19, 2000.

(4)     The Unvested Shares are subject to forfeiture if for any reason
        taxpayer's services with the issuer are terminated. The forfeiture
        restriction lapses in a series of installments.

(5)     The fair market value at the time of transfer (determined without regard
        to any restriction other than a restriction which by its terms will
        never lapse) is $9.31 per share.

(6)     The amount paid for such Unvested Shares is $0.00 per share.

(7)     A copy of this statement was furnished to Columbia/HCA Healthcare
        Corporation for whom taxpayer rendered the services underlying the
        transfer of the Unvested Shares.

(8)     This statement is executed as of _______, 2000.

-----------------------------------             --------------------------------
Spouse (if any)                                 Taxpayer

<PAGE>   13

                       Supplemental Information Regarding
                        Awards to Executive Officers of
                          HCA - The Healthcare Company
<TABLE>
<CAPTION>

EXECUTIVE OFFICER                                  SHARES OF ONESOURCE MED, INC.

<S>                                                <C>
David G. Anderson                                  250

Jack O. Bovender, Jr.                              1,355

Richard M. Bracken                                 250

Victor L. Campbell                                 200

Rosalyn S. Elton                                   200

James A. Fitzgerald, Jr.                           200

Thomas F. Frist, Jr.                               1,600

V. Carl George                                     200

Jay Grinney                                        250

Samuel N. Hazen                                    250

Frank M. Houser                                    200

R. Milton Johnson                                  300

Patricia T. Lindler                                200

A. Bruce Moore Jr.                                 200

Philip R. Patton                                   200

Gregory S. Roth                                    200

Bill B. Rutherford                                 250

Joseph N. Steakley                                 200

Beverly B. Wallace                                 200

Robert Waterman                                    200

Noel B. Williams                                   400

Alan R. Yuspeh                                     200
</TABLE><PAGE>   1

                                                                    EXHIBIT 10.5

                                  May 25, 2000

R. Clayton McWhorter
Chairman
Clayton Associates
113 Seabord Lane
Suite B 200
Franklin, Tennessee 37067-8215

         RE:  RETIREMENT BENEFITS

Dear Clayton:

         You have advised us that you are retiring as a director of
Columbia/HCA Healthcare Corporation (the "Company") effective at the Company's
annual meeting of shareholders. On behalf of the Company, I write to express
our deepest appreciation for the many valuable contributions you have made to
the Company and to confirm the benefits being made available to you in
connection with your retirement from our board of directors. In recognition of
your service to the Company and for your undertaking of the obligations
hereunder, the Company hereby agrees as follows:

                  1.       Stock Options. Concurrent with your retirement from
         the Board, the Company will take action which provides that, with your
         consent and the execution of a mutually agreeable amendment, all of
         your currently outstanding options to purchase shares of the Company's
         common stock granted to you pursuant to the Columbia/HCA Healthcare
         Corporation Outside Directors Stock and Incentive Compensation Plan
         (the "Plan") or other plans in which you may participate will be
         amended to allow your options to continue to vest and remain
         exercisable at any time through their expiration date notwithstanding
         your retirement from our board of directors.

                  2.       Restricted Stock. Concurrent with your retirement
         from the Board, the Company will take action which provides that, with
         your consent and the execution of a mutually agreeable amendment, all
         of the restricted stock units granted to you pursuant to the Plan will
         be amended to continue to vest notwithstanding your retirement from our
         board of directors.

<PAGE>   2

                  3.       Withholding Tax Payments. To the extent required by
         law, federal, state and local income and payroll withholding taxes
         shall be withheld on all amounts payable to you pursuant to this
         letter agreement.

                  4.       Cooperation. From and after the date hereof, you
         agree to cooperate in all reasonable respects with the Company and its
         affiliates and subsidiaries and their respective directors, officers,
         attorneys and experts in connection with the conduct of any action,
         proceeding, or litigation involving the Company or any of its
         subsidiaries and affiliates. The Company will reimburse you for any
         reasonable out-of-pocket expenses incurred by you in connection with
         your compliance with this Section 4.

                  5.       General Release. In consideration of the benefits
         provided to you under this Agreement, you hereby release and discharge
         the Company, its subsidiaries and affiliates and each of their
         respective officers, employees, directors and agents from any and all
         claims, actions and causes of action (collectively "Claims"), including
         without limitation, any Claims arising under any applicable federal,
         state or local or foreign law, that you may have, or in the future may
         possess, arising out of (i) your association or employment relationship
         with and service as a director, employee or officer of the Company or
         any of its subsidiaries or affiliates, and the termination of such
         relationship or service or (ii) any event, condition, circumstance or
         obligation that occurred, existed or arose on or prior to the date
         hereof; provided however, that the release set forth in this section
         will not apply to (A) the obligations of the Company under this
         Agreement and (B) the obligations of the Company and its subsidiaries
         to continue to provide director and officer indemnification. You agree
         that the benefits described in this Agreement will be in full
         satisfaction of any and all claims for payments or benefits, whether
         express or implied, that you may have against the Company or any of its
         subsidiaries or affiliates arising out of your service as a director of
         Company or any of its subsidiaries or affiliates and the termination
         thereof.

                  6.       Entire Agreement. This Agreement sets forth the
         entire agreement and understanding of the parties hereto with respect
         to the matters covered hereby and supersedes and replaces any express
         or implied prior agreement with respect to the terms of your service as
         a director with the Company.
<PAGE>   3
                  7.       GOVERNING LAW. This Agreement will be governed by,
         and construed in accordance with the laws of the state of Tennessee.

         We appreciate your service to the Company and wish you well in your
future endeavors.

                              Very truly yours,

                              /s/ THOMAS F. FRIST, JR., M.D.
                              --------------------------------------------
                              Thomas F. Frist, Jr., M.D.

Accepted and agreed:

/s/ R. CLAYTON MCWHORTER
--------------------------------
R. Clayton McWhorter

Date: May 25, 2000
     --------------------------

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