DOCTORS HEALTH SYSTEM INC
424B3, 1997-05-19
MISC HEALTH & ALLIED SERVICES, NEC
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PROSPECTUS SUPPLEMENT NO. 12                    Filed pursuant to Rule 424(b)(3)
To the Prospectus dated January 24, 1997,            Registration No.: 333-01926
As Supplemented to Date

                                   532 Shares

                                       of

               Class B Common Stock of Doctors Health System, Inc.

      This Prospectus Supplement No. 12 relates to the issuance by Doctors
Health System, Inc., a Maryland corporation ("Doctors Health") of 532 shares of
its Class B Common Stock, par value $.01 per share (the "Class B Common Stock")
pursuant to the Primary Care Participation Agreement (the "Participation
Agreement") to be entered into between Dr. Samuel M. Shor ("Physician"), and
Doctors Health. This Prospectus Supplement should be read in conjunction with
the Prospectus dated January 24, 1997 and the Prospectus Supplement No. 1 dated
March 14, 1997 which contains the Company's Quarterly Report on Form 10-Q for
the period ended December 31, 1996.

      Doctors Health's principal executive office is located at 10451 Mill Run
Circle, Tenth Floor, Owings Mills, Maryland 21117, telephone number (410)
654-5800.

      NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS SUPPLEMENT AND, IF GIVEN OR
MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED. THIS PROSPECTUS SUPPLEMENT DOES NOT CONSTITUTE AN OFFER OF ANY
PERSON TO EXCHANGE OR SELL, OR A SOLICITATION FROM ANY PERSON OF AN OFFER TO
EXCHANGE OR PURCHASE, THE SECURITIES OFFERED BY THIS PROSPECTUS SUPPLEMENT, OR
THE SOLICITATION OF A PROXY FROM ANY PERSON, IN ANY JURISDICTION IN WHICH IT IS
UNLAWFUL TO MAKE SUCH AN OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS
PROSPECTUS SUPPLEMENT NOR ANY DISTRIBUTION OF THE SECURITIES TO WHICH THIS
PROSPECTUS SUPPLEMENT RELATES SHALL UNDER ANY CIRCUMSTANCES CREATE ANY
IMPLICATION THAT THE INFORMATION CONTAINED THEREIN IS CORRECT AT ANY TIME
SUBSEQUENT TO THE DATE HEREOF. 

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

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROXY STATEMENT/PROSPECTUS. ANY REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.

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

      See "Risk Factors" referred to on page S-2 hereof for certain information
that should be considered in connection with an investment in securities of
Doctors Health.

      The date of this Prospectus Supplement is April 28, 1997.
<PAGE>

                                  RISK FACTORS

Financial Performance of Doctors Health

      Doctors Health has a limited operating history and for the fiscal year
ended June 30, 1996 and the six months ended December 31, 1996, recorded a net
loss of approximately $6.6 million and $6.7 million, respectively. Doctors
Health is likely to record a net loss for the fiscal year ending June 30, 1997.
There can be no assurance that after the Closing Date Doctors Health will earn
operating profits.

Risk Factors set forth in the Prospectus dated January 24, 1997

      The Risk Factors set forth in the Prospectus are incorporated herein by
reference and should be read carefully by investors.

PROPOSED PRIMARY CARE PARTICIPATION AGREEMENT AMONG DOCTORS HEALTH AND DR.
SAMUEL M. SHOR

      The following description of the transactions contemplated by the
Participation Agreement does not purport to be complete and is qualified in its
entirety by reference to the Participation Agreement, a copy of which is
attached to this Prospectus Supplement as Annex A and is incorporated herein.
Physician is urged to read the Participation Agreement in its entirety.

General

      Pursuant to the Participation Agreement, (i) Physician agrees to
participate in the managed care agreements that Doctors Health enters into with
Payors who have contracted with Doctors Health with respect to HMO managed care
products ("DHS HMO Plans"), (ii) Physician agrees to provide eligible persons
who elect to enroll in DHS HMO Plans (each, a "DHS HMO Member") with those
primary care services customarily provided by primary care physicians, as may be
required by the DHS HMO Plans, (iii) Physician will be paid cash in the amount
of $18,623.00 upon execution of the Participation Agreement and satisfactory
completion of credentialling of Physician by DHS, and (iv) DHS will issue to the
Physician 532 shares of its Class B Common Stock.

Access to Doctors Health Services; Credentialling

      Pursuant to the Participation Agreement, Doctors Health agrees to provide
to Physician, once Physician has 100 DHS Members in his medical practice and at
no cost to Physician, access to the managed care component of Doctors Health's
information system, which offers patient registration, referral tracking and
management and data management capabilities. Doctors Health will also undertake
to credential Physician, at no cost to Physician. Pursuant to the Participation
Agreement, Physician agrees to cooperate with the Doctors Health credentialling
and review process at no cost to Physician.

Exclusive IPA Arrangement

      Pursuant to the Participation Agreement, Physician agrees to participate
in the managed care agreements that Doctors Health enters into with DHS HMO
Plans. Physician is required pursuant to the Participation Agreement to
cooperate with Doctors Health in accepting DHS HMO Members under the DHS HMO
Plans, and agrees not to participate or contract with any other HMO or other
payor offering managed care or other risk-type plans directly or indirectly;
provided, however, that if Doctors Health chooses not to pursue a contract with
an identified HMO or is unable to negotiate such a contract within a
commercially reasonable time period, Physician shall be free to pursue a
contract with the identified HMO.


                                      S-2
<PAGE>

Capitation Rates; Bonus Pool

      The Participation Agreement provides that DHS will determine the
commercial and Medicare primary care base capitation rates using their good
faith best efforts to reflect the prevailing market rate for the county and city
in which Physician provides covered services (the "Primary Care Base Capitation
Rates"). The Primary Care Base Capitation Rates may be adjusted for age and sex
of the DHS HMO members. The Primary Care Base Capitation Rate shall be adjusted
by an amount up to ten percent each based upon (i) a formula for Commercial HMO
Members taking into account certain factors as capitation panel size, DHS
membership growth, scheduled office hours and service and medical care
coordination considerations; and (ii) a formula for Medicare HMO Members taking
into account the number of HMO Members served by Physician's medical practice.
The Commercial and Medicare formulas are set forth on Exhibit D-21 of the
Participation Agreement. All payments of the Primary Care Base Capitation Rates
will be made by Doctors Health directly to Physician, by the fifth day of the
month for the prior month's enrollment. Physician agrees pursuant to the
Participation Agreement not to seek or collect or accept any reimbursement from
DHS HMO Members or the DHS HMO Plans for any covered services provided to DHS
HMO Members, except for copayments and coinsurance.

      The Participation Agreement also provides that Physician may participate
in a bonus pool established by Doctors Health's affiliated physicians. The
amount of bonus awards are determined according to Doctors Health's primary care
bonus system, rewarding high clinical quality, appropriate utilization, patient
satisfaction and retention and the extent of cooperation with other
participating physicians, and Doctors Health. Based upon these factors,
Physician may receive a bonus based upon the surplus generated in Physician's
panel of DHS HMO Members, after managed care expenses, up to a maximum of 25% of
all Primary Care Base Capitation payments received by Physician that year or the
limits provided by applicable health care regulations. Bonus awards for a
calendar year, if any, will be paid by April of the following year. There can be
no assurance that a bonus will be paid in any given year or, if paid, as to the
amount of any bonus. A copy of Doctors Health's bonus system for primary care
physicians is on file at the offices of Doctors Health and will be made
available at the request of Physician.

Obligations of Physician

      Pursuant to the Participation Agreement, Physician agrees to abide by and
comply with the relevant provisions of the agreements between Doctors Health and
the DHS HMO Plans. Doctors Health will provide Physician with all relevant
provisions that may apply to such Physician. In such connection, the
Participation Agreement provides that Physician shall work cooperatively and in
good faith with Doctors Health and the other Doctors Health affiliated
physicians providing services to the DHS HMO members. Physicians are required to
(i) prepare and maintain customary medical records for services provided to DHS
HMO Members and provide Doctors Health with access to such records without
charge, (ii) comply with and accept the payment conditions of the Participation
Agreement, (iii) comply with managed care medical standards adopted by Doctors
Health affiliated physicians as part of the arrangements with the DHS HMO Plans,
and (iv) cooperate with Doctors Health's efforts to contact eligible Medicare
and adult medicine patients in Physician's practice, including providing mailing
lists and the use of Physician's name in correspondence, and (v) sign and submit
in a timely manner authorizations, consents, encounter data and other forms
adopted by Doctors Health.

      Pursuant to the Participation Agreement, Physician will own and operate
all aspects of his medical practice and will remain responsible for all
operations of the medical practice, including all patient treatment decisions
and employee, office, lease and financial affairs. Doctors Health is not engaged
in the practice of medicine and will not interfere in any patient treatment
decisions. The Participation Agreement provides an agreement by Physician not to
differentiate or discriminate in 


                                      S-3
<PAGE>

the treatment of patients as to the quality of services delivered because of
race, sex, age, religion, place of residence, health status or source of
payment. Physician is required to make arrangements for 24 hour seven day per
week coverage to DHS HMO Members through other primary care physicians who
participate in the Doctors Health provider network.

      Doctors Health will provide to Physician a list of other physicians and
other health care providers who provide medical services in the Doctors Health
provider network. Other than in cases of a bona fide emergency, the
Participation Agreement requires Physician to utilize the Doctors Health
provider network when arranging for additional medical services required by DHS
HMO Members. Doctors Health may use Physician's name, specialty, telephone
number and business location in marketing, descriptive and other information
relating to the DHS HMO Plans. The Participation Agreement provides that
Physician may be precluded from participating in a DHS HMO product by one of the
DHS HMO Plans. In such event, Doctors Health will notify Physician, in writing,
within 30 days of learning of such an action, and will assist Physician, if
requested, in seeking to overturn such an action.

Existing Primary Care Capitation Contracts

      The Participation Agreement provides that if Physician is a party,
directly or indirectly, to any primary care capitation contract, Physician must
notify Doctors Health of such contract and must use his commercially reasonable
best efforts to assist Doctors Health in replacing such contract with a DHS HMO
Plan, provided that the payment terms of such DHS HMO Plan are at or above the
payment terms of such existing contract.

Quality Assurance/Utilization Review Programs

      Pursuant to the Participation Agreement, Physician will participate in all
utilization review, quality assurance and credentialling programs operated by
Doctors Health to assure or improve the quality and effective utilization of
health care services to the DHS HMO Members. In such connection, Physician
agrees (i) not to hold Doctors Health or any other participants in such quality
assurance/utilization review programs responsible for reasonable recommendations
made or actions taken in good faith with respect to Physician, and (ii) to
participate in all programs developed by Doctors Health that are designed to
resolve DHS HMO Member grievances.

DHS Protocols

      Pursuant to the Participation Agreement, Physician agrees to follow the
protocols and practice procedures which have been developed by Doctors Health's
affiliated physicians which are applicable to physician participants in the
Doctors Health provider network. In such connection, if Physician should ever
deem any aspect of such protocols to be medically inappropriate or otherwise
inappropriate for utilization, Physician may notify Doctors Health in writing
with sufficient specificity to enable Doctors Health to respond to Physician's
concerns.

Term; Termination

      The Participation Agreement will terminate five years from its effective
date unless earlier terminated pursuant to its terms.

      Doctors Health may terminate the Participation Agreement by notice in
writing to Physician (i) if Physician materially breaches the Participation
Agreement and such breach continues for 30 days after written notice is given to
Physician by Doctors Health specifying the nature of such breach, or (ii) for
"good cause." The Participation Agreement defines "good cause" to mean the
occurrence of any one of the following: (a) Physician's membership in any
professional organization is terminated for cause related to professional
conduct, or Physician 


                                      S-4
<PAGE>

resigns from any professional organizations under the threat of disciplinary
action for professional conduct, (b) Physician is indicted for a charge of
committing a felony or any misdemeanor involving moral turpitude, (c) Physician
fails to comply with rules, regulations and policies imposed with regard to
Medicare programs or fails to preserve his or her eligibility to participate in
Medicare programs, (d) physician fails to comply with any material Doctors
Health protocols, (e) Physician takes any action which puts a DHS HMO Member's
health at risk, or (f) Physician loses his or her license or certificate to
practice medicine.

      Physician may terminate the Participation Agreement upon 90 days written
notice to Doctors Health if Doctors Health fails to perform its obligations to
Physician to pay any amounts required to be paid by Doctors Health to Physician.

Maintenance of Liability Insurance

      The Participation Agreement provides that Physician must maintain, at his
expense, general and professional liability insurance coverage of not less than
$1 million per claim and $3 million per year. Physician is required pursuant to
the Participation Agreement to provide Doctors Health with copies of such
policies or other evidence of compliance with such insurance requirements and is
required to notify Doctors Health of any changes or cancellations to any such
policy. In the event of a cancellation of a policy, Physician is required to
purchase an extension of coverage endorsement within 10 days of written notice
of discontinuance and must provide Doctors Health with a copy of such
endorsement. Pursuant to the Participation Agreement, Physician must also notify
Doctors Health promptly when any patient of Physician files a claim or any
notice of intent to commence legal action alleging professional negligence
against Physician, or of the settlement of any such claim, or if a judgment is
entered against Physician in any such claim.

                         RESALE OF CLASS B COMMON STOCK

      The shares of Class B Common Stock offered by this Prospectus Supplement
have been registered under the Securities Act of 1933, as amended. The shares
will be subject to the Stockholders Agreement attached hereto as Annex B and
therefore, will not be freely transferable. In addition, there is no public
market for the Class B Common Stock.

                                  LEGAL MATTERS

      The validity of the Class B Common Stock offered hereby have been passed
upon for the Company by Venable, Baetjer and Howard, LLP, Baltimore, Maryland.

      ANNEXES

      Annex A - Participation Agreement between Doctors Health System, Inc. and
Samuel M. Shor

      Annex B - Stockholders Agreement dated January 31, 1997, delivered to
Physician as Prospectus Supplement No. 2


                                      S-5
<PAGE>

                                     ANNEX A

                      PRIMARY CARE PARTICIPATION AGREEMENT

1.    This Participation Agreement is entered into on __________________, 1997
      (the "Effective Date") by DOCTORS HEALTH SYSTEM, INC. ("DHS") and the
      Physician whose name appears below.

2.    DHS agrees to arrange for the provision of various management,
      administrative and support services in connection with managed care
      contracting, including contracting, marketing, care management and
      information systems support. (For a description of these services see
      Exhibit A-2 attached.)

3.    Physician or the Physician's group practice entity, if the Physician
      participates as a partner or employee of a group practice entity, will be
      paid a Signing Bonus in part cash and part shares of DHS Class B Common
      Stock, as set forth on Exhibit B-3 attached hereto and made a part hereof.
      This payment will be made upon execution of this Agreement, satisfactory
      credentialing of Physician by DHS and provision of Physicians' financial
      statements and Medicare patient list and is subject to modification to the
      extent the information received by DHS differs from the information
      provided on Exhibit B-3. This payment is made based upon Physician's
      assurance to DHS that he/she is an actively practicing primary care
      physician who intends to enter into a cooperative relationship with other
      DHS affiliated physicians to manage care to DHS HMO Members.

4.    This Agreement will expire five (5) years from the Effective Date of this
      Agreement (the "Term"), unless earlier terminated pursuant to the terms
      hereof.

5.    DHS agrees to provide Physician, once Physician has at least 100 DHS
      Members, at no cost to the Physician, access to the DHS Information System
      managed care components, offering Enrollment, Eligibility, Referral
      Management and Data Management capabilities.

6.    Physician agrees to provide to eligible persons who elect to enroll in an
      HMO managed care product offered by any Payor who has contracted with DHS
      (the "DHS HMO Plans") those primary care services customarily provided by
      primary care physicians to eligible patients, as may be required by the
      DHS HMO Plans. These patients are referred to in this Agreement as the
      "DHS HMO Members".

7.    DHS will credential Physician. Physician agrees to cooperate with the DHS
      credentialing and review process, all at no cost to Physician.

8.    Physician agrees to participate in the managed care agreements that DHS
      enters into with DHS HMO Plans. Physician agrees to cooperate with DHS in
      accepting DHS HMO Members under the DHS HMO Plans, and agrees not to
      participate or contract with any other HMO or other payor offering managed
      care or other risk type plans directly or through another similar entity
      or other IPA. However, if DHS chooses not to pursue a contract with an
      identified HMO or is unable to negotiate such a contract within a
      commercially reasonable period, Physician shall be free to pursue a
      contract with the identified HMO.

9.    If Physician, as of the Effective Date, is a party (directly or indirectly
      through another similar entity or IPA) to any primary care capitation
      contract (each an "Existing Primary Care Capitation Contract"), Physician
      agrees to notify DHS of such Existing Primary Care Capitation Contract.
      Physician agrees to use his or her commercially reasonable best efforts to
      assist DHS in replacing such Existing Primary Care Capitation Contract
      with a DHS HMO Plan, provided the payment terms to the Physician under the
      DHS HMO Plan are at or above the payment terms of the Existing Primary
      Care Capitation Contract. Until DHS is able to replace the Existing
      Primary Care Capitation Contract with a DHS HMO Plan, the Physician shall
      be free to renew the Existing Primary Care Capitation Contract for
      additional one year terms.

10.   Physician agrees to abide by and comply with the relevant provisions of
      the agreements between DHS and the DHS HMO Plans. DHS provide all relevant
      provisions that may apply to Physician.
<PAGE>

11.   Physician agrees to work cooperatively and in good faith with DHS and the
      other DHS affiliated physicians providing services to the DHS HMO Members.
      To this end, Physician will use all reasonable efforts to: 

     o    Prepare and maintain customary medical records for services provided
          to DHS HMO Members and provide the IPA with access to such records
          without charge. DHS agrees that all patient records will be treated as
          confidential and will comply with laws and regulations related to
          confidentiality and all ethical standards for physicians regarding the
          confidentiality of patient records.

     o    Comply with and accept payment conditions of this Agreement.

     o    Comply with managed care medical standards adopted by DHS affiliated
          physicians as part of arrangements with the DHS HMO Plans.

     o    Cooperate with DHS's efforts to contact eligible Medicare and adult
          medicine patients in Physician's practice, including providing mailing
          lists and use of Physician's name in correspondence.

     o    Sign and submit in a timely manner authorizations, consents, encounter
          data and other forms adopted by DHS.

     o    Comply with DHS policies and guidelines which DHS provides to
          physician.

12.   Physician will participate in all utilization review, quality assurance
      and credentialing programs operated by DHS and the IPA to assure or
      improve the quality and effective utilization of health care services to
      the IPA HMO Members ("QA/UR Programs"). Physician agrees not to hold DHS
      and other participants in the QA/UR Programs responsible for any
      reasonable recommendations made or actions taken in good faith with
      respect to Physician. Physician will participate in all programs developed
      by DHS that are designed to resolve DHS HMO Member grievances.

13.   Physician agrees not to differentiate or discriminate in the treatment of
      patients as to the quality of services delivered to DHS HMO Members
      because of race, sex, age, religion, place of residence, health status or
      source of payment, and to observe, protect and promote the rights of DHS
      HMO Members as patients.

14.   Physician will in good faith make arrangements, with the support of
      Physician's assigned DHS representative, for twenty-four hours, seven days
      a week coverage to DHS HMO Members through other primary care physicians
      who participate in the DHS provider network to the extent the DHS provider
      network is adequate to provide such coverage in Physician's service area.

15.   Physician agrees to respond within seven (7) days of receipt to any
      written inquiry from DHS regarding services provided to DHS HMO Members or
      any other matters relating to this Agreement, subject to all laws
      regarding the confidentiality of medical records,.

16.   DHS will provide to Physician a list of other physicians and other health
      care providers who provide medical services in the DHS provider network.
      Other than in cases of a bona-fide medical emergency or where DHS and the
      Physician have agreed the DHS provider network is insufficient, Physician
      agrees to utilize the DHS provider network when arranging for additional
      medical services required by DHS HMO Members.

17.   DHS's affiliated physicians have developed protocols and practice
      procedures applicable to fellow physician participants in the DHS provider
      network (the "DHS Protocols"). Physician agrees to follow the DHS
      Protocols when treating DHS HMO Members. If Physician should ever deem any
      aspect of the DHS Protocols to be medically inappropriate or otherwise
      inappropriate for utilization by Physician, Physician may notify DHS in
      writing, with sufficient specificity to enable DHS to respond to
      Physician's concerns.

18.   Physician will own and operate all aspects of his or her medical practice
      and will remain responsible for all operations of the medical practice,
      including all patient treatment decisions and employee, office, lease and
      financial affairs. DHS is not engaged in the practice of medicine and will
      not interfere in any patient treatment decisions.

19.   DHS may use Physician's name, specialty, telephone number(s), and business
      location(s) in marketing, descriptive, and other information relating to
      the DHS HMO Plans, and will include Physician as a member of the DHS
      provider network during this Agreement. Physician may 


                                      A-2
<PAGE>

      nonetheless be precluded from participating in a DHS HMO Product by one of
      the DHS HMO Plans. In such an event, DHS will notify Physician, in
      writing, within 30 days of learning of such an action, and will assist
      Physician, if requested, in seeking to overturn such an action.

20.   During the calendar year 1997, DHS will pay to Physician, and Physician
      agrees to accept from DHS as compensation for all covered services
      provided by Physician to DHS HMO Members the Primary Care Base Capitation
      Rates as shall be set forth on Exhibit C-20 to be attached hereto and made
      a part hereof. For calendar year 1998 and beyond, DHS shall establish in
      cooperation with DHS participating primary care physicians a Primary Care
      Base Capitation Rate that shall reflect at least the prevailing market
      rate for the county or city in which the Physician provides covered
      services.

21.   The Primary Care Base Capitation Rates may be adjusted for age and sex of
      the DHS HMO Members. The Primary Care Base Capitation Rates will be
      increased by an amount up to ten percent (10%) (the "Capitation Rate
      Modifier"), according to a Medicare and Commercial formula established by
      DHS as set forth on Exhibit D-21 attached hereto and made a part hereof.

22.   Physician will, in addition to the Primary Care Capitation payment, be
      paid on a fee for service basis for certain identified services (as set
      forth on Exhibit E-22 attached) which are not considered covered services
      according to the DHS fee schedule that will be approximately equal to cost
      and less than alternative specialist expenditures.

23.   In order to provide economic incentives for Physicians to provide the best
      possible health care to DHS HMO Members while fostering efficiencies in
      utilization and quality assurance, DHS's affiliated physicians have
      established, and Physician will participate in, a bonus pool. The amount
      of bonus awards are determined according to DHS's primary care bonus point
      system, rewarding high clinical quality, appropriate utilization, patient
      satisfaction and retention and the extent of cooperation with other
      participating physicians DHS. Based upon this system, DHS will fund a
      primary care physician bonus pool which will be credited with 25% of the
      managed care surplus remaining after deduction of the actual costs
      associated with the provision of managed care services. The Physician will
      receive a bonus based upon the net surplus in the bonus pool that is
      generated in Physician's panel of DHS HMO Members up to the limits
      permitted by applicable health care regulations. The Primary Care
      Capitation Rates for any year are guaranteed and never charged or offset
      for any losses. Losses are the sole responsibility of DHS. Bonus Awards
      for calendar year 1996 will be paid by DHS in April of 1997. Awards for
      calendar year 1997 will be made in April of 1998 etc. (The DHS "Bonus
      Point System" for Primary Care Physicians is set forth on Exhibit F-23
      attached hereto and made a part hereof.)

24.   All Payments of the Primary Care Capitation Rate will be made by DHS
      directly to Physician, by the fifth business day of each month for the
      prior month's enrollment. The Capitation Rate Modifier will be calculated
      at the beginning of each quarter and used to determine the following
      quarters' Primary Care Capitation Rate. (For an illustration of the flow
      of the healthcare dollar and an example of the PCP compensation model, see
      Exhibit G-24 and Exhibit H-24 (attached), respectively.)

25.   Physician understands that DHS will be paid by the DHS HMO Plans for all
      services provided by Physician to DHS HMO Members.

26.   Physician agrees not to bill or collect any reimbursement from DHS HMO
      Members or the DHS HMO Plans unless the service provided was not a covered
      service under the DHS HMO Plan and the DHS HMO Member was given prior
      written notice that the services would not be covered. However, Physician
      may charge, bill, collect and keep from DHS HMO Members any copayments or
      coinsurance. Physician agrees that, whether or not there is any unresolved
      dispute for payment, under no circumstances, including but not limited to
      nonpayment by DHS or DHS insolvency, will Physician make any claims, other
      than for copayments or coinsurance, against any DHS HMO Member for covered
      services.

27.   Physician will maintain, at his or her expense, general and professional
      liability insurance coverage of not less than $1,000,000 per claim and
      $3,000,000 per year. Physician will provide DHS with copies of the
      policies or other evidence of compliance with the insurance 


                                      A-3
<PAGE>

      requirements. Physician will notify DHS when any patient of Physician
      files a claim or any notice of intent to commence legal action alleging
      professional negligence against Physician or of the settlement of any such
      claim by Physician or if a judgment is rendered against Physician in any
      such legal action. Physician will promptly notify DHS in writing of any
      changes in or cancellations of any policy of insurance maintained by
      Physician. If such policy is written on a claims made basis and such
      coverage is discontinued, Physician will purchase an "Extension of
      Coverage Endorsement" within ten (10) days of written notice of
      discontinuance and shall provide DHS with a copy of this endorsement.

28.   This Agreement may be terminated by Physician upon 90 days prior written
      notice to DHS if DHS fails to perform its obligations to Physician or to
      pay any amounts required to be paid by DHS to Physician.

29.   DHS may terminate this Agreement by notice in writing to Physician for
      good cause, or if Physician materially breaches this Agreement and such
      breach continues for a period of thirty (30) days after written notice is
      given to Physician by DHS specifying the nature of the breach. Good cause
      means:

            o     Physician's membership in any professional organization is
                  terminated for cause related to professional conduct, or
                  Physician resigns from any professional organizations under
                  the threat of disciplinary action for professional conduct.

            o     Physician is indicted upon a charge of committing a felony or
                  any misdemeanor involving moral turpitude.

            o     Physician fails to comply with rules, regulations and policies
                  imposed with regard to the Medicare programs or to preserve
                  his or her eligibility to participate in the Medicare
                  programs.

            o     Physician fails to comply with any material DHS Protocols.

            o     Physician takes any action which puts a DHS HMO Members'
                  health at risk.

            o     Physician loses his/her license or certificate to practice
                  medicine.

30.   To the extent required to enable DHS and the IPA to comply with Section
      952 of the Medicare and Medicaid Amendments of 1980, or regulations
      promulgated pursuant thereto, Physician shall until the expiration of four
      (4) years after the furnishing of services under this Agreement, make
      available, upon written request, to the Secretary of Health and Human
      Services or the Comptroller General of the United States, or to any of
      their duly authorized representatives, this Agreement and such of
      Physician's books, documents and records as are necessary to certify the
      nature and extent of costs under this Agreement.


                                      A-4
<PAGE>

PRINTED NAME OF PHYSICIAN                 PHYSICIAN




                                          By:                             (SEAL)
- ----------------------------                 -----------------------------
Please Attach Business Card                  Samuel M. Shor, M.D.


                                          DOCTORS HEALTH SYSTEM, INC.




                                          By:                             (SEAL)
                                             -----------------------------
                                             Stewart B. Gold, President


                                      A-5
<PAGE>

                                   EXHIBIT A-2

                              Schedule of Services

I.    Care Management includes:

      A.    Credentialing and Provider File Maintenance. In compliance with NCQA
            standards, the credentialing process gathers information on our
            member providers, performs primary source verification, provides
            automatic recredentialing activities and alerts providers when items
            need to be renewed and/or reevaluated.

      B.    Referral Management. The DHS Referral Management Program provides
            for the maintenance of referral directories; authorization of DHS
            referrals to network providers; clinical review of referrals for
            appropriateness, according to DHS physician approved criteria; and
            tracking and reporting of referral patterns to identify outliers and
            encourage recommendations for change.

      C.    Utilization Management. The DHS Utilization Management Program
            reviews and tracks the utilization of healthcare services,
            particularly inpatient stays, to facilitate appropriate hospital
            admissions; provides recommendations for alternate site care and
            assists with the coordination of these services; provides clinical
            review of procedural necessity; and works with the physician to
            identify practice pattern trends.

      D.    Case Management. The DHS Case Management Program offers to
            physicians the skills of registered nurses and licensed clinical
            social workers in order to assist in the coordination of the care
            and services required by patients with catastrophic and/or chronic
            illnesses or injuries. The case manager works in conjunction with
            the physician, patient and family to identify healthcare needs,
            develop a plan of care, establish realistic treatment goals,
            coordinate and monitor necessary resources, and evaluate treatment
            progress.

II.   Data Management. The DHS Data Management service coordinates the receipt
      and maintenance of payor eligibility and benefit plan information. It also
      allows for the coordination and integration of a variety of data
      components to yield meaningful reports which will reflect the overall
      performance of a provider network, i.e., utilization, costs and quality.

III.  Patient Services. DHS provides all Participating Physicians, access to
      nurse triage and patient advocacy services. Through these services,
      specially trained nurses are available by phone to answer questions
      regarding access to services, treatment alternatives and self care
      options.

IV.   Third Party Administration. The DHS Third Party Administration services
      provide for the appropriate adjudication of claims, coordination of
      benefits, subrogation services and integration with the reinsurance
      carrier.


                                      A-6
<PAGE>

                                   EXHIBIT B-3

                                  SIGNING BONUS

Physician's Signing Bonus is based upon the following representations made by
Physician:

1.    Physician's gross primary care collections for the 1996 calendar year were
      $542,950.00.

2.    The number of Physician's active(1) Medicare patients is 401.

Based upon and subject to the accuracy of the information provided herein,
Physician's Signing Bonus shall be an amount equal to:

1.    Cash in the amount of $18,623.00.

2.    532 shares of Class B Common Stock of Doctors Health.

A Prospectus describing Doctors Health and its affiliates is enclosed. Please
direct your attention to pages 8 to 16 of the Prospectus which describes the
risk factors which you should consider in evaluating an investment in the
securities offered under the Prospectus and in this Agreement. We will provide
updated information about this company in the form of a Prospectus Supplement.

- --------
(1)   Patients who have made at least one office visit to Physician during the
      last two years.


                                      A-7
<PAGE>

                                  EXHIBIT C-20

Doctors Health System
PCP Compensation

DHS Capitation - Base Rates

1997 Primary Care Base Capitation Rates
Medicare

County                           Aged/ Disabled            Institutionalized
- ------                           --------------            -----------------
                                                           
    Allegany                         $26.70                      $52.06
    Anne Arundel                     $36.00                      $60.00
    Baltimore                        $30.36                      $59.19
    Baltimore City                   $31.23                      $60.00
    Calverty                         $26.15                      $50.99
    Caroline                         $24.00                      $46.80
    Carroll                          $26.97                      $52.58
    Cecil                            $24.86                      $48.48
    Charles                          $31.16                      $60.00
    Dorchester                       $24.00                      $46.80
    Frederick                        $24.00                      $46.80
    Garrett                          $24.00                      $46.80
    Harford                          $29.45                      $57.43
    Howard                           $30.68                      $59.82
    Kent                             $24.00                      $46.80
    Montgomery                       $32.00                      $60.00
    Prince Georges                   $40.62                      $60.00
    Queen Anne                       $24.00                      $46.80
    St. Marys                        $26.34                      $51.37
    Somerset                         $24.00                      $46.80
    Talbot                           $24.00                      $46.80
    Washington                       $24.00                      $46.80
    Wicomico                         $24.00                      $46.80
    Worcester                        $24.00                      $46.80
                                                           
                                               
    Note:

    The base rate for IPA PCPs is the same as the "DHS partner rate". 

    For the Medicare IPA only PCPs, the Base Rates are the same, but the
      capitation rate modifier ("CRM") criteria is different (see CRM section).


                                      A-8
<PAGE>

                                  EXHIBIT C-20

Doctors Health System
PCP Compensation

DHS Capitation - Base Rates

1997 Primary Care Base Capitation Rates
Commercial

Region        $0 Co-Pay       $5 Co-Pay       $10 Co-Pay      $15 Co-Pay
- ------        ---------       ---------       ----------      ----------
Baltimore     Male    Female  Male    Female  Male    Female  Male    Female
      0-.5    $46.28  $46.28  $38.32  $38.32  $30.38  $30.38  $22.43  $22.43
      .5-2    $30.67  $30.67  $27.65  $27.65  $24.64  $24.64  $21.58  $21.58
      3-5     $21.65  $21.65  $19.59  $19.59  $17.42  $17.42  $15.25  $15.25
      6-18    $10.45  $10.45  $ 9.39  $ 9.39  $ 8.40  $ 8.40  $ 7.37  $ 7.37
      19-39   $12.00  $12.00  $11.00  $11.00  $10.00  $10.00  $ 9.00  $ 9.00
      40-64   $12.00  $12.00  $11.00  $11.00  $10.00  $10.00  $ 9.00  $ 9.00
      64+     $12.00  $12.00  $11.00  $11.00  $10.00  $10.00  $ 9.00  $ 9.00

D.C. / Suburban      
Maryland (2)  Male    Female  Male    Female  Male    Female  Male    Female
      0-.5    $48.57  $48.57  $40.21  $40.21  $31.86  $31.86  $23.54  $23.54
      .5-2    $32.19  $32.19  $29.01  $29.01  $25.85  $25.85  $22.65  $22.65
      3-5     $22.72  $22.72  $20.46  $20.46  $18.27  $18.27  $16.01  $16.01
      6-18    $10.97  $10.97  $ 9.85  $ 9.85  $ 8.81  $ 8.81  $ 7.74  $ 7.74
      19-39   $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50
      40-64   $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50
      64+     $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50

Eastern Shore     To Be Determined

Southern
Maryland (3)  Male    Female  Male    Female  Male    Female  Male    Female
      0-.5    $48.57  $48.57  $40.21  $40.21  $31.86  $31.86  $23.54  $23.54
      .5-2    $32.19  $32.19  $29.01  $29.01  $25.85  $25.85  $22.65  $22.65
      3-5     $22.72  $22.72  $20.46  $20.46  $18.27  $18.27  $16.01  $16.01
      6-18    $10.97  $10.97  $ 9.85  $ 9.85  $ 8.81  $ 8.81  $ 7.74  $ 7.74
      19-39   $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50
      40-64   $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50
      64+     $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50

Western
Maryland (4)  Male    Female  Male    Female  Male    Female  Male    Female
      0-.5    $48.57  $48.57  $40.21  $40.21  $31.86  $31.86  $23.54  $23.54
      .5-2    $32.19  $32.19  $29.01  $29.01  $25.85  $25.85  $22.65  $22.65
      3-5     $22.72  $22.72  $20.46  $20.46  $18.27  $18.27  $16.01  $16.01
      6-18    $10.97  $10.97  $ 9.85  $ 9.85  $ 8.81  $ 8.81  $ 7.74  $ 7.74
      19-39   $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50
      40-64   $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50
      64+     $13.50  $13.50  $12.50  $12.50  $11.50  $11.50  $10.50  $10.50


(1)   Includes Baltimore City and Anne Arundel, Baltimore, Carroll, Cecil,
      Harford, and Howard counties.
(2)   Includes Montgomery and Prince Georges counties.
(3)   Includes Calvert, Charles, and St. Marys counties.
(4)   Includes Allegany, Frederick, Garrett and Washington counties.

Notes:

The base rate for IPA PCPs is the same as the "DHS partner rate".


                                      A-9
<PAGE>

                                  EXHIBIT D-21

                DHS Capitation - Capitation Rate Modifier ("CRM")
                            (up to 10% of Base Rate)

                               Commercial Formula

                                                                         CRM
                                                                      Percentage
                                                                      ----------

I.  Capitation Panel Size

            o     > 100 members/doctor or 200 members/practice           0.5%

            o     > 300 members/doctor or 750 members/practice           1.5%

            o     > 500 members/doctor or 1,250 members/practice         2.5%

            o     > 1,000 members/doctor or 2,500 members/practice       3.5%

II.    DHS Membership Growth

            o     Membership growth > 10% per year
                    (min. = 100 patients)                                1.25%

            o     Membership growth > 20% per year 
                    (min. = 250 patients)                                2.50%

III.   Scheduled Office Hours

            o     > 50 office hours per week                              0.5%

            o     > 60 office hours per week                              1.5%

            o     > 70 office hours per week                              2.5%

IV.    Internal Coverage                                                  1.5%

            o     Coverage of the practice by its own physicians to deliver
                  better service and care coordination


   Maximum CRM as a % of the Base Rate   =                               10.0%

                                Medicare Formula

Capitated Panel Size

> 50 Medicare HMO Members/physician or 150 Medicare HMO 
  Members/practice group                                                  2.5%

> 100 Medicare HMO Members/physician or 350 Medicare HMO 
  Members/practice group                                                  5.0%

> 250 Medicare HMO Members/physician or 700 Medicare HMO 
  Members/practice group                                                  7.5%

> 400 Medicare HMO Members/physician or 1200 Medicare HMO 
  Members/practice group                                                 10.0%

Maximum CRM as a % of the Base Rate                                      10.0%

THE FORMULAS PROVIDED ARE SUBJECT TO CHANGE BASED UPON CHANGES IN THE MARKET AND
RECOMMENDATIONS FROM PRIMARY CARE PHYSICIANS REPRESENTING EACH COUNTY.


                                      A-10
<PAGE>

                                  EXHIBIT E-22

                   DHS Capitation - Fee For Service Additions

                         Sampling of Identified Services

o     Allergy testing (not routine shots)

o     Colposcopy

o     Endometrial biopsies

o     Flex sig Fracture/casting

o     Immunizations (cost of serums only)

o     Joint asperation/injection

o     Minor surgery (includes I&D)

o     Nasolaryngoscopy

o     Pulmonary function test

o     Suturing (in minor surgery?)


                                      A-11
<PAGE>

                                  EXHIBIT F-23

                  Point System for the Bonus Pool Distribution

                                                                Available
                                                                PCP
                                                                Points
                                                                ------
I.  Utilization

      o     Hospital                                             5.0

      o     Specialist                                           5.0

      o     Emergency room, other                                5.0

II.    Patient Satisfaction/Retention                            2.5

      o     Based on results of annual surveys

III.   Clinical Quality                                          2.5

      o     Chart reviews and outcomes

IV.    "Citizenship"                                             5.0

      o     Overall DHS cooperation and participation, 
            including network loyalty

                 MAXIMUM PCP BONUS POINTS =                     25.0


                                      A-12
<PAGE>

                                  EXHIBIT G-24

                          Flow of the Healthcare Dollar


               [Graphic depicting flow of the Healthcare Dollar]


Explanation:

1.    DHS receives a capitated payment from the DHS HMO Plans based on a
      negotiated percentage of (i) the premium paid by employers to the Plan
      (for "Commercial Patient") and (ii) the AAPCC paid by the Health Care
      Financing Administration (the "Federal Government") to the Plan (for
      "Medicare Patients") (collectively "DHS Full Risk Contracts").

2.    DHS pays all medical related claims and expenses including (i) primary
      care physicians capitation, (ii) specialists fees and capitation, (iii)
      institutional expenses to hospitals, nursing homes, skilled nursing
      facilities, etc. DHS retains from the SURPLUS the direct costs associated
      with the coordination and support of managed care, i.e. contracting, stop
      loss insurance, care managers, etc.

3.    Through prudent utilization of hospitals, specialists and other healthcare
      services and the support of DHS care management, DHS is left with the
      SAVINGS. 


                                      A-13
<PAGE>

      Collectively the PCPs share at least 25% of the SAVINGS (the "PCP Bonus
      Pool").

4.    Each Individual Physician is paid a portion of the bonus pool according to
      the "Bonus Point System". This amount may be greater than 25% of that
      Physician's surplus, up to the maximum permitted by applicable healthcare
      regulations then in effect.


                                      A-14
<PAGE>

                                  EXHIBIT H-24

                            PCP Compensation Example

Assumptions:

o     1,800 Total Patients in an average practice

o     1,400 Commercial Patients

o     400 Medicare Patients

o     20% are converted to DHS Full Risk Contracts in year one

o     PCP Base Capitation Rates established with Physician Representatives from
      Northern Virginia

o     Potential Commercial Rate = $15.00, Potential Medicare Rate = $36.00

Analysis:
                                            280                      80
                                  DHS Commercial Patients  DHS Medicare Patients
                                  -----------------------  ---------------------

o   CRM => Capitation Panel Size            .50                     2.5%
           DHS Membership Growth           2.50
           Office Hours                     .50
           Internal Coverage               1.50
                                           ----
                                           5.00%


o   PCP Commercial Capitation Rate         PCP Medicare Capitation Rate
            $15 x 1.05 =                           $36 x 1.025 =
            $15.75 PMPM                            $36.90 PMPM


o   Fee for Service Additions


o   Bonus Pool Participation as determined by the "Bonus Point System"

      THIS PCP COMPENSATION EXAMPLE IS FOR ILLUSTRATION PURPOSES ONLY. THE
COMMERCIAL AND MEDICARE CAPITATION RATES ARE REPRESENTATIVE OF THE RATES IN
EFFECT FOR OTHER MARKETS. AS CONTEMPLATED BY THE AGREEMENT, THE RATES FOR YOUR
COUNTY WILL BE ESTABLISHED IN COOPERATION WITH PHYSICIAN REPRESENTATIVES FROM
YOUR COUNTY.


                                      A-15


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