FRESENIUS MEDICAL CARE HOLDINGS INC /NY/
8-K, 2000-01-21
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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                      SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C. 20549

                                  __________

                                   FORM 8-K


                                CURRENT REPORT

    Pursuant to Section 13 or 15 (d) of the Securities Exchange Act of 1934


                       Date of Report: January 18, 2000


                     Fresenius Medical Care Holdings, Inc.
              --------------------------------------------------
              (Exact name of registrant as specified in charter)


                                   New York
                                   --------
                (State or other jurisdiction of incorporation)


                1-3720                              13-3461988
                ----------------------------------------------
       (Commission File Number         (IRS Employer Identification No.)


  Two Ledgemont Center, 95 Hayden Avenue,   Lexington, Massachusetts    02420
  ---------------------------------------------------------------------------
  (Address or principal executive offices)                         (Zip Code)

     Registrant's telephone number, including area codes: (781) 402-9000


                                Not Applicable
                                --------------
         (Former name or former address, if changed since last report)
<PAGE>

ITEM 5. OTHER EVENTS

OIG INVESTIGATION

     Since 1995, National Medical Care, Inc. ("NMC"), a subsidiary of Fresenius
Medical Care Holdings, Inc. (the "Company"), and certain of NMC's subsidiaries
have been the subject of criminal and civil investigations (the "OIG
Investigation") by the Office of Inspector General ("OIG") of the United States
Department of Health and Human Services, the United States Attorney for the
District of Massachusetts (the "U.S. Attorney's Office") and other government
authorities concerning possible violations of federal laws, including the anti-
kickback statutes and the False Claims Act.

     On January 18, 2000, the Company, NMC and certain affiliated companies
executed definitive agreements (the "Settlement Agreements") with the United
States Government (the "Government") to resolve (i) the matters covered in the
OIG Investigation and (ii) NMC's claims with respect to approximately $153.5
million of outstanding Medicare receivables for nutrition therapy rendered on
and before December 31, 1999 (collectively, the "Settlement"). The Settlement is
subject to court approval, which is expected to be granted.

     Under the Settlement Agreements, the net Settlement payment to the
Government is approximately $427.1 million (the "Net Settlement Amount"). The
Net Settlement Amount is comprised of (i) an initial payment to the Government
of approximately $286.4 million which will be paid immediately after court
approval of the Settlement and dismissal of certain legal actions, (ii)
additional installment payments over the next eighteen months totaling
approximately $186.3 million and (iii) payments previously made to the
Government under the voluntary disclosure program totaling approximately $13.6
million, less installment payments by the Government to the Company over the
next eighteen months totaling approximately $59.2 million for the above-
mentioned receivables claims (which shall bear interest on unpaid amounts at
7.5% per annum). Interest on the Company's installment payments will accrue at a
rate equal to the 52-week treasury bill interest rate at the time of court
approval of the Settlement on $51.2 million of the installment payments and at
7.5% annually on the balance of the installment payments, until paid in full. As
security for its obligations under the Settlement Agreements, the Company
amended the $150 million Letter of Credit that was issued to the Government in
1996 to increase the amount available for drawing under the Letter of Credit to
approximately $189.6 million. The maximum drawing amount will be reduced over
time consistent with the Company's installment principal payments to the
Government.

     The Company's net cash outflow resulting from the Settlement Agreements is
anticipated to be approximately $265.5 million. This amount reflects the
anticipated receipt of the receivables payment from the Government, the tax
benefit of the special charge discussed below and the payment terms of the Net
Settlement Amount. The cash savings of the tax benefit are expected to be
realized over the next eighteen months.

     The Company believes that it will have sufficient cash flows from continued
operations and borrowing capacity under its senior credit facility to pay the
Net Settlement Amount. The Company also believes that following such payments,
it will continue to have sufficient funds available for both its day-to-day
operations and its anticipated growth.

     In anticipation of the Settlement, the Company previously recorded a
special pre-tax charge against its consolidated earnings for the three month
period ended September 30, 1999 totaling $590 million ($412 million after tax).
An additional charge to earnings of approximately $11 million was recorded in
the three month period ended December 31, 1999 to reflect the reduction in
payments from the Government for the resolution of the receivables claims
discussed above. These charges will cover the payment of the
                                       2
<PAGE>

Net Settlement Amount, a $94.3 million write-off of the remaining receivables
described above, and other related costs.

     After giving effect to the special charge, the Company remained in
compliance with the financial covenants in its senior credit facility. In
December 1999, the Company and the lenders under the Company's senior credit
facility amended certain covenants in the senior credit facility to accommodate
the Company's obligations under the Settlement Agreements and to enable the
Company to continue in compliance with the covenants upon consummation of the
Settlement.

     The OIG Investigation covered the following areas: (a) NMC's dialysis
services business, principally relating to its Medical Director contracts and
compensation; (b) NMC's treatment of credit balances resulting from overpayments
received under the Medicare, Medicaid, TriCare and other Government and
commercial payors, NMC's billing for home dialysis services, and its payment of
supplemental medical insurance premiums on behalf of indigent patients; (c)
Lifechem, Inc.'s laboratory business, including testing procedures, marketing,
customer relationships, competition, overpayments that were received by
Lifechem, Inc. from the Medicare program , a 1997 review of dialysis facilities'
standing orders, and the provision of discounts on products from NMC's products
division, grants, equipment and entertainment to Lifechem, Inc.'s customers; (d)
NMC Homecare, Inc.'s intradialytic parenteral nutrition therapy ("IDPN")
business and, in particular, information concerning IDPN utilization,
documentation of claims and billing practices including various services,
equipment and supplies and payments made to third parties as compensation for
administering IDPN therapy; and (e) billing for certain doppler flow and bio-
impedance analysis tests performed in clinical studies.

     As a result of the Settlement, NMC's subsidiaries, Lifechem, Inc., NMC
Homecare, Inc. and NMC Medical Products, Inc. will plead guilty to certain
violations of federal law. The plea agreements impose a total of approximately
$101.2 million in federal criminal fines, which is included in the Net
Settlement Amount. As a consequence of their guilty pleas, these subsidiaries
will be excluded from further participation in federally-funded health care
programs, including Medicare, Medicaid and TriCare. The Company believes that
these exclusions will not materially interrupt its provision of, or receipt of
payment for, the products and services formerly provided by the excluded
subsidiaries because the Company intends to continue to provide such products
and services through other subsidiaries which are qualified to participate in
federal health care programs.

     With the exception of the three above-mentioned guilty pleas, the Company
has been advised that the Government has declined criminal prosecution of the
Company, its parent, and subsidiaries, with respect to all aspects of the OIG
Investigation and that there is no pending federal criminal investigation of the
Company. Further, with respect to the Settlement, the Government has released
the Company from civil liability for all conduct described in the Settlement
Agreements and has advised the Company that, with the limited exception
referenced below, the Government has no current investigation and no intention
of initiating an investigation in connection with any conduct that has been the
subject of the OIG Investigation. The continued effectiveness of the releases
described above is subject to the Company's satisfaction of all payment
obligations under the Settlement Agreements. There have been allegations
recently raised by private parties against the Company, most of which have been
previously investigated by the Government in the course of the OIG Investigation
and resolved without a finding of liability against the Company. While there can
be no assurance, the Company currently believes that the resolution of such
allegations will not have a material adverse impact on the Company's business,
financial condition or results of operations.

     Each of the qui tam or "whistleblower" actions relating to the issues
raised by the OIG Investigation will be dismissed as a result of the Settlement,
with the exception of a portion of the qui tam filed in the United States
District Court for the Middle District of Tennessee on December 15, 1994,
transferred to the United States District Court for the District of
Massachusetts in 1995, and disclosed to the Company in September 1999. The
portion of this qui tam action that will not be dismissed as a result of the
Settlement alleges, among other things, that the Company and the Company's
parent Fresenius Medical

                                       3
<PAGE>

Care AG violated the Medicare and Medicaid Anti-Kickback Statute by providing
discounted hemodialysis products to induce the purchase of laboratory services.
In the Settlement Agreements, the Government has declined to continue to pursue
further the investigation or prosecution of these allegations. While the
dismissal of this portion of this qui tam action was offered to the Company by
the Government and the current and former Company employees who filed this qui
tam action (the "relators") in connection with the Settlement, such dismissal
was conditioned on a full release by the Company of all Company claims against
the relators. The Company is unwilling to release its claims against the
relators. While there can be no assurance, the Company currently believes that
the resolution of these remaining allegations will not have a material adverse
impact on the Company's business, financial condition or results of operations.

       Whistleblower actions are filed under seal as a matter of law in the
first instance, thereby preventing disclosure to the Company and to the public
except by court order. The Company or certain of its subsidiaries may be the
subject of other "whistleblower" actions not yet known to the Company or which
have not yet been unsealed.

       The Settlement does not extend to any current or former employees of NMC
or its subsidiaries who have been, or may be, indicted in connection with the
OIG Investigation.

       In connection with the Settlement, the Company entered into a Corporate
Integrity Agreement dated January 18, 2000 with the OIG (see Exhibit 10.1
attached to this Current Report on Form 8-K). During the eight-year term of this
agreement, the Company is required, among other things, to staff and maintain a
comprehensive compliance program. This program must include a written code of
conduct, compliance training programs, compliance policies and procedures
relating to the areas covered by the OIG Investigation, screening of employees
and others for eligibility to participate in federal health care programs,
annual audits by an independent review organization, a confidential disclosure
program and periodic reporting to the OIG. The Corporate Integrity Agreement
provides for stipulated penalties of up to $2,500 per day for each day during
which the Company fails to satisfy its obligations under the agreement. The
Corporate Integrity Agreement permits the OIG to exclude the Company and its
subsidiaries from participation in federal health care programs in the event of
a material breach of the agreement that is not rectified by the Company within
thirty days after the Company receives written notice of the breach. NMC derives
over 60% of its consolidated revenues from Federal health care benefit programs.
Consequently, a material breach by the Company of the Corporate Integrity
Agreement that results in the exclusion of the Company or its subsidiaries from
continued participation in such programs would have a material adverse effect on
the Company's business, financial condition and results of operations.

       The foregoing discussion of  the Settlement, the Settlement Agreements
and the plea agreements is qualified in its entirety by reference to the full
text of the Settlement Agreements and the plea agreements attached as Exhibits
10.1 through 10.9 to this Current Report on Form 8-K.

       This document contains certain forward-looking statements that are
subject to various risks and uncertainties. Actual results could differ
materially from those contained in these forward-looking statements due to
certain factors including, without limitation, changes in business, economic and
competitive conditions, regulatory reforms, uncertainties in litigation or
investigative proceedings, the failure to realize anticipated tax deductions,
and the availability of financing. These and other risks and uncertainties,
which are more fully described in the Company's reports filed from time to time
with the Commission, could cause the Company's actual results to differ
materially from the results that have been or may be projected by or on behalf
of the Company.


ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS

     (c)  Exhibits

                                       4
<PAGE>

     Exhibit 10.1   Corporate Integrity Agreement dated January 18, 2000 between
                    the Company and Office of the Inspector General of the
                    Department of Health and Human Services

     Exhibit 10.2   Settlement Agreement and Release dated January 18, 2000 by
                    and among United States of America, Lifechem, Inc., NMC
                    Medical Products, Inc., National Medical Care, Inc., the
                    Company and Jay A. Buford, Russell J. Davis and William L.
                    Schoff

     Exhibit 10.3   Settlement Agreement and Release dated January 18, 2000 by
                    and among United States of America, NMC Homecare, Inc.,
                    National Medical Care, Inc., the Company Ven-A-Care of the
                    Florida Keys, Inc. and Dana R. Austin

     Exhibit  10.4  Settlement Agreement and Release dated January 18, 2000 by
                    and among United States of America, Clinical Diagnostic
                    Systems, Inc., NMC Diagnostic Services, Inc., Bio-Medical
                    Applications Management Company, Inc., National Medical
                    Care, Inc. and the Company

     Exhibit  10.5  Settlement Agreement and Release dated January 18, 2000 by
                    and among United States of America, National Medical Care,
                    Inc., the Company, Gregory S. Price and Richard Bradford

     Exhibit 10.6   Plea Agreement dated January 13, 2000 by and among Lifechem,
                    Inc., the United States Department of Justice and the United
                    States Attorney for the District of Massachusetts.

     Exhibit 10.7   Plea Agreement dated January 13, 2000 by and among NMC
                    Medical Products, Inc., the United States Department of
                    Justice and the United States Attorney for the District of
                    Massachusetts.

     Exhibit 10.8   Plea Agreement dated January 13, 2000 by and among NMC
                    Homecare, Inc., the United States Department of Justice and
                    the United States Attorney for the District of
                    Massachusetts.

     Exhibit 10.9   Letter Agreement dated January 17, 2000 by and among the
                    Company, the United States Department of Justice and the
                    United States Attorney for the District of Massachusetts

                                       5
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                                   SIGNATURE

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

                                   FRESENIUS MEDICAL CARE HOLDINGS, INC.

Date: January 21, 2000             By:  /s/ Jerry A. Schneider
                                        ---------------------------
                                        Jerry A. Schneider
                                        Chief Financial Officer

                                       6
<PAGE>

                               INDEX TO EXHIBITS


EXHIBIT NUMBER             DESCRIPTION


   Exhibit 10.1  Corporate Integrity Agreement dated January 18, 2000 between
                 the Company and Office of the Inspector General of the
                 Department of Health and Human Services

   Exhibit 10.2  Settlement Agreement and Release dated January 18, 2000 by and
                 among United States of America, Lifechem, Inc., NMC Medical
                 Products, Inc., National Medical Care, Inc., the Company and
                 Jay A. Buford, Russell J. Davis and William L. Schoff

   Exhibit 10.3  Settlement Agreement and Release dated January 18, 2000 by and
                 among United States of America, NMC Homecare, Inc., National
                 Medical Care, Inc., the Company Ven-A-Care of the Florida Keys,
                 Inc. and Dana R. Austin

   Exhibit 10.4  Settlement Agreement and Release dated January 18, 2000 by and
                 among United States of America, Clinical Diagnostic Systems,
                 Inc., NMC Diagnostic Services, Inc., Bio-Medical Applications
                 Management Company, Inc., National Medical Care, Inc. and the
                 Company

   Exhibit 10.5  Settlement Agreement and Release dated January 18, 2000 by and
                 among United States of America, National Medical Care, Inc.,
                 the Company, Gregory S. Price and Richard Bradford

   Exhibit 10.6  Plea Agreement dated January 13, 2000 by and among Lifechem,
                 Inc., the United States Department of Justice and the United
                 States Attorney for the District of Massachusetts.

   Exhibit 10.7  Plea Agreement dated January 13, 2000 by and among NMC Medical
                 Products, Inc., the United States Department of Justice and the
                 United States Attorney for the District of Massachusetts.

   Exhibit 10.8  Plea Agreement dated January 13, 2000 by and among NMC
                 Homecare, Inc., the United States Department of Justice and the
                 United States Attorney for the District of Massachusetts.

   Exhibit 10.9  Letter Agreement dated January 17, 2000 by and among the
                 Company, the Untied States Department of Justice and the United
                 States Attorney for the District of Massachusetts



<PAGE>

                                                                    EXHIBIT 10.1


                   CORPORATE INTEGRITY AGREEMENT between the
                          Office of Inspector General
                                    of the
                    Department of Health and Human Services
                                      and
                     Fresenius Medical Care Holdings, Inc.

I.   Preamble
     --------

     Fresenius Medical Care Holdings, Inc. d/b/a Fresenius Medical Care North
America hereby enters into this Corporate Integrity Agreement ("CIA") with the
Office of Inspector General ("OIG") of the United States Department of Health
and Human Services ("HHS") to ensure compliance by Fresenius Medical Care
Holdings, Inc. and each of its subsidiaries that provides items or services for
which payment may be made by any Federal health care program (hereinafter
collectively referred to as "Fresenius"), and by all of Fresenius's employees,
contractors, and agents, with the requirements of Medicare, Medicaid and all
other Federal health care programs (as defined in 42 U.S.C. (S) 1320a-7b(f))
(hereinafter collectively referred to as the "Federal health care programs").
This CIA shall be applicable only to those operations of Fresenius that are
subject to United States law and regulations.  Fresenius's compliance with the
terms and conditions in this CIA shall constitute an element of  Fresenius's
present responsibility with regard to participation in the Federal health care
programs.  Contemporaneously with this CIA, Fresenius is entering into
Settlement Agreements with the United States, and this CIA is incorporated by
reference into the Settlement Agreements.

                                       1
<PAGE>

A.  Definitions

          1.  "Affiliate": subject to the provisions of Section I.A.6 below
          relating to dialysis facilities which are subsidiaries of Fresenius as
          of the effective date of this CIA, any corporation, joint venture or
          other organization or entity that provides or is involved in the
          provision of dialysis services to beneficiaries of Federal health care
          programs in which Fresenius holds a direct or indirect equity interest
          of 5% or more but does not exercise majority voting control; or with
          respect to which Fresenius has a management contract to provide
          management and administrative services that gives it control over the
          day-to-day operations of the dialysis facility.

          2.  "Business Segment": each of the core business activities of
          Fresenius, including at a minimum, (i) dialysis services; (ii) medical
          products; (iii) clinical laboratory services; (iv) diagnostic testing
          services; and (v) parenteral and enteral nutrition.

          3.  "Contractor":  any individual or entity whose work is performed at
          a location neither owned nor operated by Fresenius, with whom
          Fresenius has entered into a contract or other arrangement to furnish
          health care items or services for which Fresenius claims reimbursement
          from any Federal health care program.

          4.  "Covered Person": any (i) officer, director, or employee of
          Fresenius; or (ii) agent or other individual (including medical
          director) who furnishes health care items or services at a Fresenius
          owned or operated location for which Fresenius claims reimbursement
          from any Federal health care

                                       2
<PAGE>

          program or who participates in the preparation or submission of claims
          for payment on behalf of Fresenius with respect to items or services
          for which Fresenius claims reimbursement from any Federal health care
          program (regardless of where such activity takes place).
          Notwithstanding the above, this term does not include part-time or per
          diem employees who are not reasonably expected to work more than 160
          hours per year, except that any such individuals shall become "Covered
          Persons" at the point when they work more than 160 hours during any 12
          month period.

          5.  "Federal Rules":  any statutes, regulations, manual provisions, or
          formal bulletins or notices issued by the Health Care Financing
          Administration, its contractors (i.e., intermediaries or carriers) or
          other regulatory agencies (e.g., State Medicaid agencies) or their
          contractors responsible for administering Federal health care
          programs.  Any references or citations within the CIA to any
          particular Federal Rule shall be deemed to apply to such Federal Rule
          as it may be amended from time to time.  In the event of any change to
          a Federal Rule that has a material effect on the obligations of
          Fresenius under this CIA, the parties shall negotiate in good faith to
          amend this CIA to accommodate such change.

          6.  "Subsidiary": any corporation or other organization that provides
          items or services for which payment may be made by any Federal health
          care program and in which Fresenius holds a direct or indirect equity
          interest and exercises majority voting control; provided, however,
          that if a dialysis facility meets the definition of subsidiary as of
          the effective date of this

                                       3
<PAGE>

         CIA, then that facility shall remain a subsidiary for as long as
         Fresenius holds a direct or indirect equity interest of 5% or more in
         the facility and for all purposes during the duration of this CIA,
         nothwithstanding any subsequent changes in ownership or control that
         otherwise would change the status of the facility from a subsidiary to
         an affiliate.

II.  Term of the CIA
     ---------------

     The period of the compliance obligations assumed by Fresenius under this
CIA shall be eight years from the effective date of this CIA (unless otherwise
specified).  The effective date of this CIA will be the date on which the final
signatory of this CIA executes this CIA.  The OIG may, at its sole discretion
and in writing, terminate or reduce the compliance obligations assumed by
Fresenius under this Agreement after five years.

III. Corporate Integrity Obligations
     --------------------------------

     Fresenius warrants and represents that it currently operates and maintains
a compliance program ("Program").  Pursuant to and for the duration of this CIA,
Fresenius shall maintain its current Program, and, as required below, amend the
Program to adhere to or include the following obligations or elements.

     A.  Compliance Officers and Committee
         ---------------------------------

          1.  Corporate Compliance Officer. For the duration of this CIA,
Fresenius shall continue to maintain an individual to serve as Corporate
Compliance Officer, consistent with the following requirements. The Corporate
Compliance Officer shall be responsible for ensuring the development and
implementation of policies, procedures, and practices designed to ensure
compliance with the requirements set forth in this CIA

                                       4
<PAGE>

and with the requirements of the Federal health care programs. The Corporate
Compliance Officer shall be a member of senior management of Fresenius, shall
make regular (at least quarterly) reports regarding compliance matters directly
to the CEO and/or to the Board of Directors of Fresenius and shall be authorized
to report to the Board of Directors at any time. The Corporate Compliance
Officer shall be responsible for monitoring the day-to-day activities engaged in
by Fresenius to further its compliance objectives, as well as any reporting
obligations created under this CIA.

     2.  Business Unit Compliance Infrastructure.

          (a) Within 90 days of the execution of this CIA, Fresenius shall also
appoint compliance officers for each of its corporate Business Units identified
in Schedule A. These Business Unit Compliance Officers will cooperate with the
Corporate Compliance Officer to ensure the development and implementation of
policies, procedures, and practices designed to ensure compliance with
applicable Federal Rules and with the requirements of this CIA. The Business
Unit Compliance Officers also will be responsible for assisting the Corporate
Compliance Officer in meeting the reporting obligations created by this
Agreement.

          (b) Within 90 days of the execution of this CIA, each of the Business
Units shall establish a Compliance Committee. These Compliance Committees shall
consist of representatives from departments or functional areas within such
Business Unit, including: (i) sales and marketing; (ii) billing and
reimbursement; (iii) human resources; and (iv) operations.
<PAGE>

          4.  Changes in Compliance Officers.  In the event a new Corporate or
Business Unit Compliance Officer is appointed during the term of this CIA,
Fresenius shall notify the OIG, in writing, within 15 days of such a change.

          5.  Corporate Compliance Committee.  For the duration of this CIA,
Fresenius shall continue to maintain its "Corporate Compliance Task Force" or
similar group however denominated  (hereinafter referred to as "the Corporate
Compliance Committee") and, to the extent necessary, shall amend the Program
within 90 days after the effective date of this CIA to ensure that the Corporate
Compliance Committee meets the following requirements.  The Corporate Compliance
Committee shall, at a minimum, include the Compliance Officer and any other
member of senior management within the provider's corporate structure as
necessary to meet the requirements of this CIA (e.g., senior executives
                                                ----
responsible for major functions, such as billing, clinical, human resources,
audit, and operations).  The Compliance Officer shall chair the Corporate
Compliance Committee and the Committee shall support the Compliance Officer in
fulfilling his/her responsibilities.

     B. Written Standards.
        -----------------

          1.  Code of Conduct.  For the duration of this CIA, Fresenius shall
continue to maintain its "Code of Ethics and Business Conduct" or similar code
however denominated (hereinafter referred to as "Code of Conduct") and, to the
extent necessary, shall amend the Program and/or Code of Conduct within 90 days
of the effective date of this CIA to ensure that the Code of Conduct meets the
following requirements.  The Code of Conduct shall be distributed within 90 days
of the effective date of this CIA to all Covered Persons who have not already
received the Code of Conduct.  Fresenius shall
<PAGE>

make adherence to Company policies and procedures designed to ensure compliance
with Federal health care program requirements an element in evaluating the
performance of managers, supervisors, and all other employees. The Code of
Conduct shall, at a minimum, set forth:

               a.  Fresenius's commitment to full compliance with Federal Rules,
               including its commitment to prepare and submit accurate billings
               consistent with Federal Rules;

               b.  a requirement that all of its Covered Persons shall be
               expected to comply with all applicable Federal Rules and with
               Fresenius's own policies and procedures;

               c.   a requirement that all Covered Persons shall be expected to
               report to Fresenius suspected violations of any Federal Rules or
               of Fresenius's own policies and procedures;

               d.  the possible consequences to both Fresenius and Covered
               Persons of their failure to comply with the Federal Rules or with
               Fresenius's own policies and procedures, or of their failure to
               report such non-compliance; and

               e.  the right of all Covered Persons to use the Confidential
               Disclosure Program, as well as Fresenius's commitment to
               confidentiality and non-retaliation with respect to disclosures.

     New Covered Persons shall receive the Code of Conduct within 30 days after
becoming a Covered Person and shall certify, in writing, that he or she has
received and will abide by Fresenius's Code of Conduct.
<PAGE>

     Fresenius shall annually review the Code of Conduct and will make any
necessary material revisions.  These revisions shall be promptly distributed to
Covered Persons.  Covered persons shall certify on an annual basis that they
have received, read, understand and will abide by the Code of Conduct.

          2.  Compliance Guidelines. Within 120 days of the effective date of
this CIA, Fresenius shall review and revise or develop written compliance
guidelines for each business segment. Such guidelines shall include (i) general
Compliance Guidelines; (ii) Sales and Marketing Guidelines; and (iii) Billing
and Reimbursement Guidelines (collectively referred to as "Business Segment
Compliance Guidelines"). Collectively, the various Business Segment Compliance
Guidelines shall, at a minimum, include:

              a.  Provisions implementing the substantive requirements of this
               CIA, including those set forth in section III.

              b.  Disciplinary guidelines and methods for Covered Persons to
               make disclosures or otherwise report on compliance issues to
               Fresenius management through the Confidential Disclosure Program
               required by section III.G.

              c.  Provisions consistent with those set forth in section III.B.3
               below that are appropriate for inclusion in such Guidelines.

     Within 150 days of the effective date of the CIA, copies of the applicable
set of Business Segment Compliance Guidelines shall be provided to the
appropriate Covered Persons.  Managers or supervisors shall be prepared to
explain the policies and procedures incorporated in the Guidelines to affected
Covered Persons.  Copies of the
<PAGE>

Business Segment Compliance Guidelines will be provided to OIG as part of the
Implementation Report.

     Fresenius shall assess and update the Business Segment Compliance
Guidelines at least annually or as necessary when changes in Federal Rules
require such updates.

          3.  Substantive Area Policies and Procedures.  Within 120 days of the
effective date of this CIA, Fresenius shall review and, where appropriate,
revise or develop written policies and procedures to address the specific
obligations identified below regarding Fresenius's provisions of items and
services and submission of claims to the Federal health care programs.  Where
appropriate, such policies and procedures shall be incorporated into the
Business Segment Compliance Guidelines.

              a.  Credit balances.  Fresenius shall have policies and procedures
regarding unreconciled payments and credit balances designed to ensure that
overpayments from Federal health care programs are identified promptly and
refunded to the appropriate payor in accordance with Federal Rules. At a
minimum, such policies and procedures shall address the following issues in the
manner prescribed below:

          (1)  Fresenius shall make adequate provisions for timely and accurate
          reporting of Federal health care program unreconciled payments and
          credit balances;

          (2) Fresenius shall address the HCFA requirements for reporting credit
          balances through the filing of credit balance reports (FORM HCFA-838);

          (3)  Fresenius shall retain an audit trail of patient account
          transactions involving Federal health care program payors for a period
          of seven years from the date that at a claim for payment was
          submitted;

          (4)  Fresenius shall track accounts with unreconciled payments and/or
          credit balances involving Federal health care programs payors so that
          it can determine the status of refund requests and the payment of
          refunds;
<PAGE>

          (5)  Fresenius's actions with regard to unreconciled payments and
          credit balances shall be in accordance with Federal Rules; and

          (6)  Fresenius shall designate at least one individual for each of its
          business segments as having responsibility for the tracking,
          recording, reporting and refunding of unreconciled payments and credit
          balances.

                    b.  Parenteral and Enteral Nutrition (PEN). Fresenius shall
have policies and procedures designed to ensure adherence to relevant Federal
Rules governing the provision and reimbursement of intradialytic parenteral
nutrition or other forms of enteral or parenteral nutrition (e.g.,
intraperitoneal nutrition) (collectively all of which shall be referred to as
"PEN"). At a minimum, such policies and procedures shall address the following
issues in the manner prescribed below:

          (1)  Fresenius shall design and implement internal controls designed
          to prevent it from receiving Federal health care program reimbursement
          for PEN that: (a) is not prescribed by the patient's physician; or (b)
          does not satisfy coverage criteria for such items or services
          published by HCFA, other appropriate regulatory agencies, or the
          appropriate contractors.  If Fresenius submits a claim for PEN that it
          reasonably believes does not satisfy the coverage criteria for a
          Federal health care program, Fresenius shall submit the claim to the
          appropriate Federal health care program contractor with an appropriate
          modifier, or other form of notice to permit such contractor to issue a
          formal denial.

          (2)  Fresenius shall submit claims for payment for PEN in accordance
          with HCFA's current coverage criteria for PEN set forth in C.I.M (S)
          65.10 as well as relevant DMERC Supplier Manuals, as in effect at the
          time the claim is submitted.

          (3) Fresenius shall submit claims for PEN only if such claims are
          properly documented to establish coverage under applicable Federal
          Rules governing the provision and reimbursement for PEN.  If Fresenius
          is unable to establish coverage and, therefore, is unable to claim
          reimbursement for
<PAGE>

          the service from a Federal health care program, Fresenius may choose
          to provide the service without charge if the treating physician
          determines that PEN is required to treat a life threatening
          nutritional disorder and Fresenius determines that the patient has no
          other means for paying for the service; provided that Fresenius make a
          determination of inability to pay on an individualized, case-by-case
          basis in accordance with a reasonable set of income guidelines
          uniformly applied in all cases. The guidelines should be based on
          objective criteria and appropriate for the applicable locality.

          (4) To the extent that Fresenius utilizes an IDPN Information Sheet
          ("IIS") or Clinical Nutrition Summary ("CNS") (or any other similar
          document, however denominated) to accompany the certificate of medical
          necessity ("CMN") in support of a PEN claim, the IIS or CNS shall
          fully and accurately describe the patient's medical condition that is
          the basis for the therapy, as that condition is documented in the
          medical record and as may be required by the applicable Medicare
          carrier, and shall not contain false statements by affirmative
          misrepresentation and/or material omission.

          (5) To the extent that Fresenius utilizes an IIS, CNS or similar form
          to support payment of a PEN claim, the form provides for (i) a
          certification by the attending physician that to the best of the
          physician's knowledge, the information contained on the form is a
          true, accurate and complete representation of the patient's medical
          condition that is the basis for the therapy; and (ii) a certification
          by any other person that has entered medical information on the form
          that to the best of that person's knowledge, the information so
          entered is a true, accurate and complete representation of the
          patient's medical condition and/or clinical status that is the basis
          for the therapy.

          (6)  Fresenius shall provide memoranda setting forth the policies and
          procedures regarding PEN documentation, medical necessity and coverage
          criteria to non-Fresenius facilities and attending physicians for whom
          Fresenius provides PEN items or services.

          (7)  Fresenius shall not illegally influence the physician's medical
          judgment or the physician's documentation of the medical necessity of
          PEN for a particular patient.
<PAGE>

          (8)  Fresenius shall not pay "hang fees" to individuals or entities
          for whom Fresenius provides PEN items or services and shall not offer
          any form of remuneration to its PEN coordinators or to any other
          individual or entity in a manner that provides illegal incentives to
          qualify patients for PEN coverage.

          (9)  Fresenius shall provide and claim reimbursement for PEN
          administration kits in conformance with applicable Federal Rules.  If
          Fresenius sells an administration kit that does not include the
          standard components prescribed by the DMERC, Fresenius shall contact
          the relevant DMERC to arrange for the use of a modifier or other code
          based upon procedures followed by that DMERC.

               c.  Laboratory Services. Fresenius shall have policies and
procedures designed to ensure adherence to relevant Federal Rules relating to
the provision of and reimbursement for clinical laboratory services. At a
minimum, such policies and procedures shall address the following issues in the
manner prescribed below:

     (1)  Medical Necessity.
          -----------------

          (a)  Generally.  (i) Fresenius shall ensure that it does not engage in
          any conduct or activities that causes the submission of claims to
          Federal health care programs for laboratory tests and/or services that
          lack medical necessity; (ii) Fresenius shall design and implement
          internal controls (1) designed to prevent Fresenius from receiving
          reimbursement for medically unnecessary tests and (2) designed to
          enable Fresenius to identify utilization patterns that may indicate
          Fresenius is receiving reimbursement for medically unnecessary tests;
          and (iii) Fresenius shall communicate to physicians that claims
          submitted for service will only be paid if the services are covered,
          reasonable and medically necessary for the beneficiary, given his or
          her clinical condition;

          (b)  Denials.  Fresenius shall ensure that its claims for Federal
          health care program reimbursement for clinical laboratory tests are
          either consistent with coverage rules or are accompanied by the
          appropriate modifier or
<PAGE>

          other indication to the relevant contractor that the claims are being
          submitted to obtain denials of payment from the contractor;

          (c)  If Fresenius is unable to obtain required documentation of
          medical necessity from the ordering physician after a good faith
          effort to obtain it, and therefore, is unable to claim reimbursement
          for a service from a Federal health care program, and the ordering
          physician has not provided an appropriately completed advance
          beneficiary notice ("ABN"), Fresenius may choose to provide the
          service at no charge to the patient, the dialysis facility where the
          patient obtains the service, or the ordering physician, provided that
          Fresenius (1) undertakes to educate the ordering physician on the need
          to document medical necessity for tests that under Federal Rules or
          local medical review policy require a diagnosis code in order to
          obtain reimbursement or obtain an ABN and the potential for violations
          of sections 1128A(a)(5) and 1128B(b) of the Social Security Act for
          failure to provide required documentation, including an ABN, to the
          laboratory; and (2) monitors orders from such ordering physician to
          assess compliance with proper documentation requirements. In the event
          that a pattern of physician non-compliance continues notwithstanding
          these efforts, Fresenius shall either bill and obtain payment from the
          ordering physician, obtain payment from the dialysis facility with
          which the ordering physician is affiliated, or cease processing such
          physician's orders.

     (2) Test Ordering Procedure and Forms.
         ---------------------------------

          (a)  Generally.  Fresenius shall ensure that all requisition forms
          (including computer-based ordering forms) are constructed to eliminate
          any improper influence on the independence of the medical necessity
          decision by the physician or other authorized individual with regard
          to each test that Fresenius bills for; and that the forms contain the
          following bold-faced and easily readable statements:  (i) Medicare
          generally does not cover routine screening tests; (ii)  Medicare will
          only pay for those tests that are reasonable and necessary; (iii)
          Tests ordered pursuant to panels and/or profiles should be reviewed to
          ensure that the tests are medically necessary; and (iv) Diagnosis
          codes should be reviewed to ensure that they accurately reflect the
          patients condition which supports the medical necessity of the tests
          ordered.
<PAGE>

          (b) Individual Requisition Form Design .  Fresenius shall require that
          its Individual Patient Custom Profile ("IPCP") or any other form which
          identifies a routine battery of tests to appear on the requisition
          form for a patient on a regular basis is signed and dated by the
          ordering physician, or person authorized by the physician and are
          reviewed annually to ensure that the IPCP continues accurately to
          reflect the individual medical needs of the patient.  At least
          annually, Fresenius will contact each physician that has established
          an IPCP for his or her patient to request confirmation in writing that
          the selected tests should continue to appear on the IPCP and that any
          diagnoses codes indicated on the IPCP are appropriate given the
          patient's clinical condition.

          Such review shall be appropriately documented in Fresenius's files.
          For the purposes of this section, "physician" includes any person
          authorized by state law to order clinical laboratory tests.

          (c)  Fresenius shall ensure that it does not use as part of its
          computerized test scheduling and reporting system any type of function
          that, except for tests where Medicare has established frequency rules
          and the tests are performed within those rules, allows non-composite
          rate tests to be automatically assigned to multiple patients (e.g.,
          patients receiving dialysis through the same modality).

     (3)  Panels.  Fresenius shall ensure that to the extent its laboratories
          ------
     permit physicians to order tests by panels, the laboratories fully disclose
     the contents of their panels on their test ordering forms or other test
     ordering system and give physicians the option of ordering each test in a
     panel individually.  If Fresenius permits tests to be ordered as panels,
     procedures shall be in place to assure that the tests that compose the
     panels are properly billed to Federal health care programs.

     (4)  Billing. Fresenius shall ensure that each claim submitted for payment
          -------
     to Federal health care programs reflect services that have been ordered
     pursuant to a valid order from the ordering physician or other authorized
     person and have been performed.

          (a) CPT/HCPCS Codes.  Fresenius shall ensure that the CPT/HCPCS codes
          used to bill services accurately describe the service that was ordered
          and performed.
<PAGE>

          (b) ICD-9 Codes.  Fresenius shall request physicians or other
          authorized individuals to submit diagnostic information for all non-
          composite tests ordered as documentation of the medical necessity of
          the service.  Fresenius shall encourage ordering physicians and other
          persons authorized to order tests to submit diagnoses in ICD-9 code
          format.  Fresenius shall ensure that when diagnoses received in non-
          ICD-9 format are translated into ICD-9 code format, such translations
          will be performed by persons with appropriate technical expertise.

          (c) Dialysis Billing Rules.  Fresenius shall ensure that claims
          submitted for clinical laboratory tests provided to ESRD patients are
          submitted consistent with the special rules applicable to dialysis
          testing, including the "50-50 rule," as such rules may be in effect
          during the term of this CIA.

          (d) Calculations.  Fresenius shall not bill for calculations (i.e.,
          clinical data mathematically derived from the results of individual
          laboratory tests ordered by a physician or other authorized person as
          part of a calculation panel), but only for such tests that are ordered
          and performed in order to derive such calculations.

     (5) OIG Fraud Alert Compliance.  Fresenius shall comply with the OIG Fraud
         --------------------------
     Alert for clinical laboratories published by the HHS/OIG in October 1994,
     which provides standards for the pricing of ESRD composite rate tests and
     the provision of phlebotomists and computers to customers.  See 59 F.R.
                                                                 ---
     65372 (December 19, 1994).  During the term of this CIA, Fresenius shall
     review annually the fair market value of the laboratory composite rate
     offered to dialysis facilities.  Each annual review shall be set forth in a
     report in which Fresenius shall explain the methodology used in the review
     and provide its calculations for determining the fair market value of its
     composite rate.  Fresenius shall provide the OIG with a copy of this report
     in its Annual Reports.

          d.  Diagnostic Testing Services.  Fresenius shall have policies and
procedures designed to ensure adherence to relevant Federal Rules relating to
diagnostic
<PAGE>

testing services. At a minimum, such policies and procedures shall address the
following issues in the manner prescribed below:

     (1)  Test Ordering Procedures.  Fresenius shall ensure that all diagnostic
          ------------------------
     procedures performed by Fresenius's independent diagnostic testing
     facilities ("IDTFs") are specifically ordered in writing by a physician or
     other authorized person, and are provided in accordance with state and
     federal regulatory requirements governing IDTFs, including but not limited
     to federal requirements set forth in 62 Fed. Reg. 59,099 (Oct. 21, 1997).

     (2)  Medical Necessity.  (i)  Fresenius shall ensure that all diagnostic
          -----------------
     procedures performed by Fresenius's IDTFs and billed to Federal health care
     programs are specifically ordered in writing by a physician or other
     authorized person; (ii) Fresenius shall ensure that it does not engage in
     any conduct or activities that causes the submission of claims to the
     Federal health care programs for diagnostic testing that lacks medical
     necessity; (iii) Fresenius shall design and implement internal controls (1)
     designed to prevent Fresenius from receiving reimbursement for medically
     unnecessary tests and (2) designed to enable Fresenius to identify
     utilization patterns that may indicate Fresenius is receiving reimbursement
     for medically unnecessary tests; and (iv) Fresenius shall communicate to
     physicians that claims submitted for a service will only be paid if the
     service is covered, reasonable and medically necessary for the beneficiary,
     given his or her clinical condition.

     (3)  ICD-9 Codes.  Fresenius shall request and encourage ordering
          -----------
     physicians and other persons authorized to order tests to submit diagnoses
     in ICD-9 code format. Fresenius shall ensure that when diagnoses received
     in non-ICD-9 format are translated into code format, such translations will
     be performed by persons with appropriate technical expertise.

     (4)  Supervising Physician.  Fresenius shall ensure that each IDTF has one
          ---------------------
     or more supervising physicians who: (a) are responsible for the direct and
     ongoing oversight of the quality of the testing performed; (b) are
     responsible for the proper operation and calibration of the equipment used
     to perform tests; (c) have proficiency in the performance and
     interpretation of each type of diagnostic procedure performed; and (d) are
     responsible for the qualification of non-physician personnel who use the
     equipment in accordance with applicable State law, licensing and
     certification requirements.
<PAGE>

     (5)  CPT Codes.  Fresenius shall ensure that the CPT codes used to bill for
          ---------
     diagnostic testing and/or services accurately describe the service that was
     ordered and performed.

                  e.  Kickbacks and Self-Referrals

     (1)  Generally.  Fresenius shall refrain from offering or paying anything
          ---------
     of value (i.e., remuneration) to dialysis facilities, their medical
     directors, physicians, hospitals or other referral sources in violation of
     the anti-kickback statute (codified at 42 U.S.C. (S) 1320a-7b(b)), the
     federal physician self referral prohibition (also known as the "Stark
     Statute" and codified at 42 U.S.C. (S) 1395nn), or other applicable
     statutes, regulations, and program requirements relating to payments to and
     from referral sources.

     (2)  Sales and Marketing.  Fresenius shall have policies and procedures
          -------------------
     designed to ensure that its sales and marketing practices and information
     are clear, accurate, informative and non-deceptive, and are designed to
     ensure that physicians and other individuals authorized to order tests,
     items, or services provided by Fresenius understand the services offered by
     Fresenius and the services that will be provided when tests, items or
     services are ordered. Fresenius shall ensure that its marketing materials
     and sales tactics are not designed for the purpose of generating orders for
     unnecessary tests or services. Fresenius shall not calculate the
     commissions it pays to sales staff in a manner that causes the sales staff
     illegally to influence a physician's judgment regarding the medical
     necessity of tests or services offered by Fresenius.

     (3)  Discounts.  Fresenius shall not offer discounts on one item or service
          ---------
     in exchange for an agreement to purchase a different item or service from
     Fresenius, unless the discount meets all of the applicable requirements to
     fall within the Safe Harbor described at 42 C.F.R. 1001.952(h), as in
     effect at the time of the offer.
<PAGE>

     C.  Training and Education.  Fresenius shall maintain and further develop
         ----------------------
its compliance training program to provide necessary training and information to
Covered Persons about applicable Federal Rules and related Fresenius policies
and procedures.  The objective of the program shall be to enable Fresenius to
operate in conformity with Federal Rules and to satisfy the requirements of this
CIA.  At a minimum, the compliance training program shall include the following
elements:

          1.  Corporate Integrity Agreement.  Fresenius shall take steps to
              -----------------------------
inform Covered Persons of the existence of, and obligations imposed by, this
CIA.  Copies of this CIA shall be made available to all Covered Persons.

          2.  General Compliance Training.  Fresenius shall maintain a
              ---------------------------
compliance training and orientation program for all Covered Persons.  Such
training shall cover:

               a.  the requirements of this Corporate Integrity Agreement;

               b.  Fresenius's Compliance Program (including the policies and
               procedures pertaining to general compliance issues); and

               c.  Fresenius's Code of Conduct.

          3.  Functional Compliance Training.  In addition to the general
              ------------------------------
compliance training described in paragraph (2), all Covered Persons, excluding
medical directors, shall receive at least two (2) hours of additional compliance
training relating to legal and regulatory issues specifically affecting their
business segment.  This training shall cover relevant Federal Rules, general and
substantive area policies and procedures, including those addressed in the
Business Segment Compliance Guidelines, as well as other relevant regulatory
matters.
<PAGE>

          4.  Specialized Training for PEN Program Personnel.  In addition to
              ----------------------------------------------
the compliance training described in paragraphs (2) and (3), all Covered Persons
assigned to the PEN program who are nurses, dietitians, pharmacists, or other
clinical personnel who (i) provide educational and nutrition consulting services
to dialysis facilities relating to PEN therapy; (ii) assess the eligibility of
patients for PEN therapy, or (iii) monitor the provision of PEN therapy to
beneficiaries of Federal health care programs shall receive at least two (2)
additional hours of training relating to legal and regulatory issues affecting
their responsibilities.  This training shall cover relevant Federal Rules, the
general and substantive area policies and procedures, including those addressed
in the Business Segment Compliance Guidelines, as well as other relevant
regulatory matters relating to coverage and medical necessity requirements for
PEN therapy.

          5.  Specialized Training for Sales and Marketing Personnel.  In
              ------------------------------------------------------
addition to the compliance training described in paragraphs (2) and (3), all
Covered Persons involved directly in sales or marketing activities relating to
items or services furnished to beneficiaries of Federal health care programs
shall receive at least two (2) additional hours of training relating to legal
and regulatory issues affecting their responsibilities.  This training shall
cover relevant Federal Rules, the general and substantive area policies and
procedures, including those addressed in the Business Segment Compliance
Guidelines, as well as other relevant regulatory matters relating to illegal
kickbacks and prohibitions on physician self-referral arrangements.

          6.  Specialized Training for Billing Personnel.  In addition to the
              ------------------------------------------
compliance training described in paragraphs (2) and (3), all Covered Persons who
participate in the preparation or submission of bills, claims, or cost reports
(either in
<PAGE>

paper or electronic format) to any Federal health care program shall receive at
least six (6) hours additional training relating to legal and regulatory issues
specifically affecting their billing-related responsibilities. This training
shall cover relevant Federal Rules, the general and substantive area policies
and procedures, including those addressed in the Business Segment Compliance
Guidelines, as well as other relevant regulatory matters. Specifically, the
training shall address:

               a.   the submission of correct and accurate bills for services
               rendered to all Federal health care program beneficiaries;

               b.   the personal obligation of each individual to make
               reasonable efforts to ensure that information provided in support
               of a submission for reimbursement for items or services furnished
               to beneficiaries of the Federal health care programs is accurate;

               c.   applicable Federal Rules;

               d.   examples of improper billing and documentation practices;
               and

               e.   the legal, regulatory, and internal Fresenius sanctions for
               improper billings.

          7.  Timeframes.  The training required by paragraph III.C.2 shall be
              ----------
provided to all Covered Persons who have not already received such training
within 60 days of the effective date of the CIA.  The training required by
paragraphs III.C.3, C.4 and C.5 shall be provided to all applicable Covered
Persons within 9 months of the effective date of this CIA.  The training
required by paragraph III.C.6 shall be provided within 90 days of the effective
date of this CIA with respect to personnel responsible for PEN, diagnostic
testing and clinical laboratory claims, and within 6 months of the
<PAGE>

effective date of this CIA with respect to personnel responsible for dialysis
services billing. Training of any type provided to applicable Covered Persons
within 6 months prior to the effective date of this CIA which meets the
requirements of paragraph C shall be deemed to meet the timeframe obligation
imposed by this paragraph.

          8.  New Covered Persons.  Affected new Covered Persons shall receive
              -------------------
the applicable training required by this CIA within the following time frames:
General Compliance Training pursuant to paragraph III.C.2 within 30 days of
commencing work or within 150 days of the effective date of this CIA, whichever
is later; Functional Compliance Training pursuant to paragraph III.C.3 within 60
days of commencing work or within 9 months of the effective date of this CIA,
whichever is later; Specialized Training pursuant to paragraphs III.C.4 or C.5
within 60 days of commencing work or within 9 months of the effective date of
this CIA, whichever is later; and Specialized Training pursuant to paragraph
III.C.6 within 30 days of commencing work or within 90 days of the effective
date of the CIA, whichever is later.  If a new Covered Person is in a position
for which training is required under this CIA and begins to perform his/her
position responsibilities prior to receiving all the training required for that
position, a Fresenius employee who has completed all the necessary training
shall take appropriate steps to supervise that untrained person's work related
to that substantive area in such a manner as to ensure that the person's work is
performed in accordance with the applicable Federal Rules, this CIA, and
Fresenius' own policies and procedures.

          9.  Medical Director Training.  Within 6 months of the effective date
              -------------------------
of this CIA, Fresenius shall develop and implement a special training and
education program for physicians with whom it contracts to furnish
administrative services as Medical Directors
<PAGE>

of its dialysis facilities. Medical Directors shall only be required to receive
the training delineated in this subsection III.C.9. Such program shall consist
of at least two elements:

               a.  baseline training of at least 2 hours duration covering (i)
               the purpose and elements of the Fresenius corporate compliance
               program and this CIA; (ii) requirements for determining and
               documenting that services furnished to beneficiaries of Federal
               health care programs meet applicable medical necessity and
               coverage requirements, and (iii) the application of other Federal
               Rules and Fresenius policies and procedures directly related to
               the duties and responsibilities of medical directors; and

               b.  annual supplemental compliance training covering material
               changes in Federal Rules, changes in Fresenius policies and
               procedures, or changes in the Fresenius corporate compliance
               program.

All new contracts or contract amendments between Fresenius and its Medical
Directors executed following the effective date of this CIA shall include a
specific obligation on the part of the Medical Director to receive at least 2
hours of baseline compliance training within 6 months of the effective date of
this CIA or within 30 days of first providing medical director services for
Fresenius, whichever is later; and thereafter the annual supplemental compliance
training.  For all other contracts between Fresenius and its Medical Directors
which are in force on the effective date of this CIA, Fresenius shall make a
reasonable good faith effort to provide the baseline compliance training and
annual supplemental compliance training to the Medical Directors as set forth in
this
<PAGE>

paragraph, encourage attendance by the Medical Directors, and report to the OIG
on the percentage of participation.

          10.  Annual Supplemental Training.  Beginning 12 months following the
               ----------------------------
effective date of this CIA, Covered Persons shall receive at least one hour of
supplemental compliance training on an annual basis.  Such training shall
address material changes in Federal Rules, changes in Fresenius policies and
procedures relating to such rules, or other changes in Fresenius's corporate
compliance program.  It shall also review and reemphasize the obligations of
Fresenius and Covered Persons to comply with Federal Rules.

          11.  Annual Compliance Training Plan.  Fresenius shall prepare an
               -------------------------------
annual compliance training plan which shall outline specific actions and
schedules to be undertaken to meet the requirements of this section.  An initial
compliance training plan shall be provided to OIG within 60 days of the
effective date of this CIA.  Subsequent annual compliance training plans shall
be provided to the OIG not later than October 30 for the following calendar
year.

          12.  Certification and Retention.  Fresenius shall ensure that each
               ---------------------------
Covered Person who is required to receive training certifies that he or she  has
received the required training.  The certification shall specify the type of
training received and the date received.  The Compliance Officer shall retain
the certification, along with specific course materials.  These shall be made
available to OIG upon request.

     D.  Application of CIA Obligations to Affiliates
         --------------------------------------------

     If Fresenius enters a new contract or arrangement to form an Affiliate
after the effective date of this CIA, Fresenius shall ensure, by including as
terms of the contract or
<PAGE>

arrangement, that the Affiliate: (1) has a Compliance Officer; (2) adopts a Code
of Conduct that meets the requirements of section III.B.1 of this CIA, subject
to appropriate modifications to address the particular circumstances of the
Affiliate; (3) has written policies and procedures that incorporate, to the
extent relevant to the Affiliate, the policies and procedures identified in
section III.B.3 of this CIA; (4) provides training to Affiliate employees
consistent with the requirements of section III.C of this CIA, other than
section III.C.11 (which requires the submission of an annual training plan to
the OIG); (5) permits the Independent Review Organization named under section
III.F of this CIA (the "IRO") access to records necessary to include the
Affiliate in the IRO review required under section III.F of this CIA; and (6)
screens for ineligible persons under section III.H of this CIA. Notwithstanding
the requirements of this section, no Affiliate may be subject to the Breach and
Default provisions contained in section X of this CIA; however, the OIG can
apply those provisions to Fresenius for any failure by Fresenius to comply with
its obligations under the provisions of this section.

     With respect to any Affiliate that was established prior to the effective
date of this CIA, Fresenius shall, within 90 days of the execution of this CIA,
communicate the requirements of this section to the Affiliate, and attempt in
good faith to obtain agreement by the Affiliate to submit to all the terms of
this section; or if agreement cannot be reached to include all the terms, then
as many as possible.

     E. Application of CIA Obligations to Contractors.
        ---------------------------------------------

     Fresenius shall take the following steps with respect to a Contractor: (1)
require in its contract with the Contractor that the Contractor acknowledge
Fresenius's compliance program and Code of Conduct; and (2) ensure that the Code
of Conduct, the Business
<PAGE>

Segment Compliance Guidelines and relevant portions of the Substantive Area
policies and procedures described in section III.B above, and a description of
the Confidential Disclosure Program are provided to the Contractor. Fresenius
shall require future contracts with such Contractors to include the above-
described provisions.

     F.  Review Procedures.
         -----------------

          1.  Retention of Independent Review Organization.  Fresenius shall
retain an entity, such as an accounting, auditing or consulting firm
(hereinafter "Independent Review Organization" or "IRO") to perform review
procedures to assist Fresenius in assessing the adequacy of its policies and
procedures and compliance practices pursuant to this CIA.  The reviews will be
performed annually and cover each of the one-year periods beginning on the
effective date of this CIA or the anniversary of that date.  The Independent
Review Organization must have expertise in the billing, coding, reporting and
other requirements of the Federal health care programs from which Fresenius
seeks reimbursement.  The Independent Review Organization must be retained to
conduct the audit of the first year within 90 days of the effective date of this
CIA.

          2.  Types of Reviews.  The Independent Review Organization will
conduct the reviews consistent with the IRO workplan attached as Schedule B, and
made part of this Agreement.

          3.  Statistical Sampling and Appraisal.  All matters related to this
CIA that involve statistical sampling or appraisal shall be conducted using the
OIG's Office of Audit Services Statistical Sampling Software, also known as
"RAT-STATS," available on the Internet at www.hhs.gov/oas/ratstat.html.
Wherever the CIA requires the use of a random sample, the sample shall be
selected and appraised using RAT-STATS and
<PAGE>

Fresenius or its IRO shall retain all of the supporting documentation related to
the selection and appraisal of the samples. Whenever the IRO workplan requires a
"Statistically Valid Sample Audit," the following requirements will apply. The
sample size for each review shall be determined through the use of a probe
sample. The probe sample must contain at least 30 sample units and cannot be
used as part of the full sample. The full sample must contain a sufficient
number of units so that when the sample results are projected to the population
of claims for that review, the projection provides a minimum 90% confidence
level and a maximum precision of plus or minus 25% of the point estimate (i.e.,
the upper and lower bounds of the 90% confidence interval shall not exceed 125%
and shall not fall below 75% of the midpoint of the confidence interval,
respectively). Both the probe sample and the full sample must be selected
through random number sampling.

          4.  Billing Reviews Methodology.  Each of the annual billing reviews
shall include the following components in its methodology:

               a.  Billing Review Objective: a clear statement of the objective
               intended to be achieved by the billing review and the procedure
               or combination of procedures that will be applied to achieve the
               objective.

               b.  Billing Review Population: the identity of the population,
               which is the group about which information is needed and an
               explanation of the methodology used to develop the population and
               provide the basis for this determination.
<PAGE>

               c.  Sources of Data: a full description of the source of the
               information upon which the billing review conclusions will be
               based, including the legal or other standards applied, documents
               relied upon, payment data, and/or any contractual obligations.

               d.  Sampling Unit: a definition of the sampling unit, which is
               any of the designated elements that comprise the population of
               interest.

               e.  Sampling Frame: the identity of the sampling frame, which is
               the totality of the sampling units from which the sample will be
               selected.

          5.  Billing Reviews Findings.  Each of the annual billing reviews
shall provide findings regarding the following as they relate to the billings
covered by that review:

               a.  Fresenius's billing and coding operation (including, but not
               limited to, the operation of the billing system, strengths and
               weaknesses of this system, internal controls, effectiveness of
               the system);

               b.  whether Fresenius is submitting accurate claims and/or cost
               reports for services billed to the Federal health care programs.

               c.  Fresenius's procedures to correct inaccurate billing, coding
               or reporting to Federal health care programs;

               d.  whether Fresenius has complied with its obligation under the
               Settlement Agreements: (a) not to resubmit any previously denied
               claims related to the conduct addressed in the Settlement
               Agreements, and its obligation not to appeal any such denials of
<PAGE>

               claims, and (b) not to charge to or otherwise seek payment for
               unallowable costs (as defined in the Settlement Agreements) and
               its obligation to identify and adjust any past charges of
               unallowable costs; and

               e.  the steps Fresenius is taking to bring its operations into
               compliance or to correct problems identified by the audit.

          6.  Contract Review.  The IRO shall review a sample of at least 30 of
Fresenius's contracts and other financial relationships that Fresenius has with
physicians, dialysis providers, and other persons who may be in a position to
refer or otherwise generate business for which Fresenius may submit claims to or
be reimbursed by any Federal health care program to determine whether these
contracts comply with applicable Federal Rules and the obligations of this CIA.

          7.  Credit Balance Review.  The IRO shall review whether Fresenius is
complying with its obligations under Federal Rules and the obligations of this
CIA to identify and report credit balances to Federal health care programs.

          8.  Compliance Review.  The compliance review shall provide findings
regarding whether Fresenius's program, policies, procedures, and operations
comply with the terms of this CIA.  This review shall include section by section
findings regarding the requirements of this CIA.

          9.  Review Reports.  The IRO shall annually produce reports
corresponding to all of the required reviews and including all of the
information required by this section of the CIA.  A complete copy of all of the
IRO's review reports with respect to each year shall be included in each of
Fresenius's Annual Reports to OIG.
<PAGE>

          10.  Verification/Validation.  In the event that the OIG has reason to
believe that any of Fresenius's Billing Reviews conducted by the IRO fail to
conform to its obligations under the CIA or indicate improper billings not
otherwise adequately addressed in the annual review report(s), and thus
determines that it is necessary to conduct an independent review to determine
whether or the extent to which Fresenius is complying with its obligations under
this CIA, Fresenius agrees to pay for the reasonable cost of any such review by
the OIG or any of its designated agents.  Prior to proceeding with such an
independent review, the OIG shall notify Fresenius of its intent to do so and
its reasons for believing such a review is necessary, and shall in good faith
attempt to resolve any Billing Review issues without proceeding with an
independent review.  However, it shall remain in the sole discretion of the OIG
to proceed with an independent review as described above.

          11.  Fresenius shall require that the IRO provide annual
certifications that no IRO members or other employees who are involved in the
IRO engagements with Fresenius hold direct or material indirect financial
interests or other arrangements that would be considered to impair their
independence under the standards of the AICPA Code of Professional Conduct and
Security and Exchange Commission regulations and policies.  The annual
certifications shall be included in the IRO's report to Fresenius and in the
Annual Reports submitted by Fresenius to the OIG.

     G.  Confidential Disclosure Program.  For the duration of this CIA,
         --------------------------------
Fresenius shall maintain its "Compliance Action Line" or similar hotline however
denominated (hereinafter referred to as the "Confidential Disclosure Program").
The Confidential Disclosure Program must include measures (e.g., a toll-free
                                                           ----
compliance telephone line) to
<PAGE>

enable Covered Persons and other individuals to disclose, to the Compliance
Officer or some other person who is not in the disclosing individual's chain of
command, any identified issues or questions associated with Fresenius's
policies, practices or procedures with respect to a Federal health care program,
believed by the individual to be inappropriate (hereinafter "compliance
disclosure"). Fresenius shall publicize the existence of the Confidential
Disclosure Program to Covered Persons.

     The Confidential Disclosure Program shall include a non-retribution, non-
retaliation policy, and shall include a reporting mechanism for anonymous,
confidential communication.  Upon receipt of a compliance disclosure, the
Compliance Officer (or designee) shall gather all relevant information from the
disclosing individual.  The Compliance Officer (or designee) shall make a
preliminary good faith inquiry into the allegations set forth in every
compliance disclosure to ensure that he or she has obtained all of the
information necessary to determine whether a further review should be conducted.
For any compliance disclosure that is sufficiently specific so that it
reasonably: (1) permits a determination of the appropriateness of the alleged
improper practice, and (2) provides an opportunity for taking corrective action,
Fresenius shall conduct an internal review of the allegations set forth in such
a compliance disclosure and ensure that proper follow-up is conducted.

     The Compliance Officer shall maintain a confidential compliance disclosure
log, which shall include a record and summary of each allegation received, the
status of the respective investigations, and any corrective action taken in
response to the investigation.

     H.  Ineligible Persons.
         ------------------
<PAGE>

          1.  Definition.  For purposes of this CIA, an "Ineligible Person"
shall be any individual or entity who:  (i) is currently excluded, suspended,
debarred or otherwise ineligible to participate in the Federal health care
programs; or (ii) has been convicted of a criminal offense related to the
provision of health care items or services and has not been reinstated in the
Federal health care programs after a period of exclusion, suspension, debarment,
or ineligibility.

          2.  Screening Requirements.  Fresenius shall not hire as employees or
engage as contractors any Ineligible Persons.  To prevent hiring or contracting
with any Ineligible Persons, Fresenius shall screen all prospective employees
and prospective contractors prior to engaging their services by (i) requiring
applicants to disclose whether they are Ineligible Persons, and (ii) reviewing
General Services Administration's List of Parties Excluded from Federal Programs
(available through the Internet at  and the HHS/OIG List of Excluded
Individuals/Entities (available through the Internet at (these lists shall
                                                        ------------------
hereinafter be referred to as the "Exclusion Lists").  The employment or
- ------------------------------------------------------------------------
retention of all employees or contractors shall be contingent upon confirmation
- -------------------------------------------------------------------------------
that the individual or entity is not an Ineligible Person.
- ----------------------------------------------------------

          3.  Review and Removal Requirement.  Within 90 days of the effective
              ----------------------------------------------------------------
date of this CIA, Fresenius will review its list of current Covered Persons and
- -------------------------------------------------------------------------------
Contractors against the Exclusion Lists.  Thereafter, Fresenius will review the
- -------------------------------------------------------------------------------
lists once semi-annually.  If Fresenius has notice that a Covered Person or
- ---------------------------------------------------------------------------
Contractor has become an Ineligible Person, Fresenius will remove such person
- -----------------------------------------------------------------------------
from responsibility for, or involvement with, Fresenius's business operations
- -----------------------------------------------------------------------------
related to the Federal health care
- ----------------------------------
<PAGE>

programs and shall remove such person from any position for which the person's
- ------------------------------------------------------------------------------
salary or the items or services rendered, ordered, or prescribed by the person
- ------------------------------------------------------------------------------
are paid in whole or part, directly or indirectly, by Federal health care
- -------------------------------------------------------------------------
programs or otherwise with Federal funds at least until such time as the person
- -------------------------------------------------------------------------------
is reinstated into participation in the Federal health care programs.
- --------------------------------------------------------------------

          4.  Pending Charges and Proposed Exclusions.  If Fresenius has notice
              -----------------------------------------------------------------
that a Covered Person is charged with a criminal offense related to any Federal
- -------------------------------------------------------------------------------
health care program, or is proposed for exclusion during his or her employment
- ------------------------------------------------------------------------------
or contract, Fresenius shall take all appropriate actions to ensure that the
- ----------------------------------------------------------------------------
responsibilities of that Covered Person do not adversely affect the quality of
- ------------------------------------------------------------------------------
care rendered to any patient or resident, or the accuracy of any claims
- -----------------------------------------------------------------------
submitted to any Federal health care program.
- -----------------------------------------------

     I.  Notification of Proceedings.  Within 30 days of discovery, Fresenius
         ---------------------------
shall notify OIG, in writing, of any ongoing investigation or legal proceeding
conducted or brought by a governmental entity or its agents involving an
allegation that Fresenius has committed a crime or has engaged in fraudulent
activities.  This notification shall be made within 30 days of the date that
Fresenius receives notice of the investigation or proceeding and shall (to the
extent known to Fresenius) include a description of the allegation, the identity
of the investigating or prosecuting agency, and the status of such investigation
or legal proceeding.  Fresenius shall also provide written notice to OIG within
30 days of the resolution of the matter, and shall provide OIG with a
description of the findings and/or results of the proceedings, if any.

     J.  Reporting.
         ---------
<PAGE>

          1.  Reporting of Overpayments.  If, at any time, Fresenius determines
that it has received an overpayment from a Federal health care program,
Fresenius shall notify the payor (e.g., Medicare fiscal intermediary or carrier)
                                  ----
within 30 days of discovering the overpayment and take remedial steps within 60
days of discovery (or such additional time as may be agreed to by the payor) to
correct any operational or policy deficiencies on Fresenius's part which may
have caused the overpayments to occur, including preventing the underlying
problem and the overpayments from recurring.

          2.  Reporting to OIG.  If Fresenius determines that there is a
Reportable Event, Fresenius shall notify the OIG within 30 days of such
determination.  Fresenius's notification to the OIG shall include the following
information; provided however, that if the Reportable Event does not involve an
overpayment, the requirements of a and b below do not apply:

          a.  all of the information provided to the payor in returning the
          overpayment;

          b.  the name and the address of the payor to whom the overpayment was
          returned;

          c.  a complete description of the Reportable Event, including the
          relevant facts, persons involved, and legal and program authorities;

          d.  Fresenius's actions to correct any operational or policy
          deficiency; and

          e.  any further steps Fresenius plans to take to address such
          operational or policy deficiency and prevent it from recurring.
<PAGE>

          3.  Definition of "Overpayment."  For purposes of this CIA, an
"overpayment" means the amount of money the provider has received in excess of
the amount due and payable under the Federal Rules.

          4.  Definition of "Reportable Event."  For purposes of this CIA, a
"Reportable Event" means anything that involves:  (i) a substantial overpayment;
(ii) a matter that a reasonable person would consider a potential violation of
criminal, civil or administrative laws applicable to any Federal health care
program for which penalties or exclusion are authorized; or (iii) a violation of
the obligation to provide items or services of a quality that meet
professionally recognized standards of health care where such violation has
occurred in one or more instances that presents an imminent danger to the
health, safety, or well-being of a Federal health care program beneficiary or
places the beneficiary unnecessarily in a high-risk situation.  A Reportable
Event may be the result of an isolated event or a series of occurrences.

IV.  New  Locations
     --------------

     In the event, after the effective date of this CIA, that Fresenius
purchases or establishes new locations or business units, which furnish health
care items or services to beneficiaries of the Federal health care programs and
are required by Federal Rules to obtain or maintain a separate provider or
supplier number, Fresenius shall notify OIG of this fact through a report on a
quarterly basis. This notification shall include the location of the new
operation(s), phone number, fax number, Federal health care program provider
number(s) (if any), and the corresponding payor(s) (contractor specific) that
has issued each provider number. All Covered Persons at such locations shall be
subject to the requirements in this CIA that apply to new Covered Persons
e.g., training
- -----
<PAGE>

requirements). In the case of acquired facilities, the obligations of this CIA
shall apply only to services or activities occurring after the effective date of
the acquisition.

V.   Implementation and Annual Reports
     ---------------------------------

     A.   Implementation Report.  Within 180 days after the effective date of
          ---------------------
this CIA, Fresenius shall submit a written report to OIG summarizing the status
of its implementation of the requirements of this CIA.  This Implementation
Report shall include:

          1.   the name, address, phone number and position description of the
          Corporate Compliance Officer and the Business Unit Compliance Officers
          required by section III.A;

          2.   the names and positions of the members of the Compliance
          Committees required by section III.A;

          3.   a copy of Fresenius's Code of Conduct required by section
          III.B.1;

          4.   A copy of the Business Segment Compliance Guidelines required by
          section III.B.2;

          5.   a description of the training programs required by section III.C,
          including a description of the targeted audiences and a schedule of
          when the training sessions have been or will be held;

          6.   a certification by the Compliance Officer that, except as
          otherwise described in the Report:

               a.   the Business Segment Compliance Guidelines required by
               section III.B.2 have been completed and distributed to all
               pertinent Covered Persons;
<PAGE>

               b.   new Covered Persons have completed the Code of Conduct
               certification required by section III.B.1; and

               c.   for training required under III.C.2 and C.6, all Covered
               Persons have completed the training and executed the
               certification required by section III.C; and for any other
               training under III.C, implementation steps are being taken
               consistent with the CIA.

          7.   a description of the Confidential Disclosure Program required by
          section III.G;

          8.   the identity of the Independent Review Organization(s) and the
          proposed start and completion date of the first audit; and

          9.   a summary of actions taken pursuant to section III.H.

     B.   Annual Reports.  Fresenius shall submit to OIG Annual Reports with
          --------------
respect to the status and findings of Fresenius's compliance activities.
Each Annual Report shall include:

          1.   any change in the identity or position description of the
          Corporate Compliance Officer, the Business Unit Compliance Officer,
          members of the Compliance Committees described in section III.A or any
          other material change in the organization or management of the
          Company's corporate compliance program;

          2.   a certification by the Compliance Officer that, except as
          otherwise described in the Report:

               a.   all Covered Persons have completed the annual Code of
               Conduct certification required by section III.B.1;
<PAGE>

               b.   all Covered Persons have completed the applicable training
               and executed the certification as required by section III.C; and

               c.   Fresenius has complied with its obligations under the
               Settlement Agreements: (i) not to resubmit any previously denied
               claims related to the conduct addressed in the Settlement
               Agreements, and its obligation not to appeal any such denials of
               claims, and (ii) not to charge to or otherwise seek payment for
               unallowable costs (as defined in the Settlement Agreements) and
               its obligation to identify and adjust any past charges of
               unallowable costs; and

               d.   Fresenius has complied with its obligations regarding
               Affiliates as required by section III.D.

          3.   notification of any material changes or amendments to the
          Business Segment Compliance Guidelines required by section III.B and
          the reasons for such changes (e.g., change in contractor policy);
                                        ----

          4.   a complete copy of the report prepared pursuant to the
          Independent Review Organization's billing and compliance reviews,
          including a copy of the methodologies used and a copy of the
          certification of IRO financial independence required under section
          III.F;

          5.   Fresenius's response/corrective action plan to any issues raised
          by the Independent Review Organization;

          6.   a summary of Reportable Events identified and reported throughout
          the course of the previous 12 months pursuant to III.J;
<PAGE>

          7.   a report of the aggregate overpayments that have been returned to
          the Federal health care programs that were discovered as a direct or
          indirect result of implementing this CIA.  Overpayment amounts should
          be broken down into the following categories: Medicare, Medicaid
          (report each applicable state separately), and other Federal health
          care programs;

          8.   a copy of the confidential compliance disclosure log required by
          section III.G;

          9.   a description of any personnel action (other than hiring) taken
          by Fresenius as a result of the obligations in section III.H, and the
          name, title, and responsibilities of any person that falls within the
          ambit of section III.H.4, and the actions taken in response to the
          obligations set forth in that section;

          10.  a summary describing any ongoing investigation or legal
          proceeding that was required to have been reported pursuant to section
          III.I.  The statement shall include a description of the allegation,
          the identity of the investigating or prosecuting agency, and the
          status of such investigation, legal proceeding or requests for
          information;

          11.  a corrective action plan to address all Reportable Events (as
          defined in section III.J) identified over the previous 12 months;

          12.  a listing of all of Fresenius's locations or business units,
          which furnish health care items or services to beneficiaries of
          Federal health care programs and are required by Federal Rules to
          obtain or maintain a separate provider or supplier number (including
          locations and mailing addresses),
<PAGE>

          the corresponding name under which each location is doing business,
          the corresponding phone numbers and fax numbers, each location's
          Federal health care program provider identification number(s) and the
          payor (specific contractor) that issued each provider identification
          number; and

          13.  A copy of the annual review and analysis of the fair market value
          of the laboratory testing composite rate as required by section
          III.B.3.c.(5).

     The first Annual Report shall be received by the OIG not later than April
1, 2001.

The Reporting Periods for this CIA shall be as follows:
          January 1, 2000 - December 31, 2000
          January 1, 2001 - December 31, 2001
          January 1, 2002 - December 31, 2002
          January 1, 2003 - December 31, 2003
          January 1, 2004 - December 31, 2004
          January 1, 2005 - December 31, 2005
          January 1, 2006 - December 31, 2006
          January 1, 2007 - December 31, 2007

Subsequent Annual Reports shall be received by the OIG no later than the
anniversary date of the due date of the first Annual Report.

     C.   Certifications. The Implementation Report and Annual Reports shall
          --------------
include a certification by the Compliance Officer under penalty of law, that:
(1) except as otherwise described in the Report, Fresenius is in compliance with
all the requirements of this CIA, to the best of his or her knowledge; and (2)
the Compliance Officer has reviewed the Report and has made reasonable inquiry
regarding its content and believes that, upon such inquiry, the information is
accurate and truthful.
<PAGE>

VI.  Notifications and Submission of Reports
     ---------------------------------------

Unless otherwise stated in writing subsequent to the effective date of this CIA,
all notifications and reports required under this CIA shall be submitted to the
entities listed below:

OIG:
- ---
               Civil Recoveries Branch - Compliance Unit
               Office of Counsel to the Inspector General
               Office of Inspector General
               U.S. Department of Health and Human Services
               Cohen Building, Room 5527
               330 Independence Avenue, SW
               Washington, DC 20201
               Phone  202.619.2078
               Fax  202.205.0604

Fresenius:
- ---------
               John Markus
               Senior Vice President - Corporate Compliance
               Fresenius Medical Care North America
               Two Ledgemont Center
               95 Hayden Drive
               Lexington, MA 02420
               Phone: (781) 402-9359
               Fax: (781) 402-9777
<PAGE>

VII.  OIG Inspection, Audit and Review Rights
      ---------------------------------------

      In addition to any other rights OIG may have by statute, regulation, or
contract, OIG or its duly authorized representative(s), may examine Fresenius's
books, records, and other documents and supporting materials and/or conduct an
onsite review of any of Fresenius's facilities, units, or locations for the
purpose of verifying and evaluating:  (a) Fresenius's compliance with the terms
of this CIA; and (b) Fresenius's compliance with the requirements of the Federal
health care programs in which it participates.  The documentation described
above shall be made available by Fresenius to OIG or its duly authorized
representative(s) at all reasonable times for inspection, audit or reproduction.
Furthermore, for purposes of this provision, OIG or its duly authorized
representative(s) may interview any of Fresenius's employees, contractors, or
agents who consent to be interviewed at the individual's place of business
during normal business hours or at such other place and time as may be mutually
agreed upon between the individual and OIG.  Fresenius agrees to assist OIG in
contacting and arranging interviews with such individuals upon OIG's  request.
Fresenius's employees may elect to be interviewed with or without a
representative of Fresenius present.

VIII. Document and Record Retention
      -----------------------------

      Fresenius shall maintain for inspection all documents and records: (1)
relating to reimbursement from the Federal health care programs for at least 7
years after the submission of the request for reimbursement; and (2) necessary
to establishing Fresenius's compliance with this CIA for at least three years
following the submission of the Annual Report covering the relevant year.

IX.   Disclosures and Privileges
      --------------------------

      Subject to HHS's Freedom of Information Act ("FOIA") procedures, set forth
in 45 C.F.R. Part 5, the OIG shall make a reasonable effort to notify Fresenius
prior to any release by OIG of information submitted by Fresenius pursuant to
its obligations under this CIA and identified upon submission by Fresenius as
trade secrets, commercial or financial information and privileged and
confidential under the FOIA rules. With respect to the disclosure of such
information, Fresenius shall have the rights set forth in 45 C.F.R. (S) 5.65(d).
Fresenius shall refrain from identifying any information as trade
<PAGE>

secrets, commercial or financial information and privileged and confidential
that does not meet the criteria for exemption from disclosure under FOIA.

     Nothing in this CIA, or any communication or report made pursuant to this
CIA, shall constitute a waiver of, or be construed to require Fresenius to waive
its attorney-client, work product or other applicable privileges.
Notwithstanding that fact, the existence of any such privilege does not affect
Fresenius's obligation to comply with the provisions of this CIA.

X.   Breach and Default Provisions
     -----------------------------

     Fresenius is expected to fully and timely comply with all of the
obligations herein throughout the term of this CIA or other time frames herein
agreed to.

     A.   Stipulated Penalties for Failure to Comply with Certain Obligations.
          -------------------------------------------------------------------
As a contractual remedy, Fresenius and OIG hereby agree that failure to comply
with certain obligations set forth in this CIA may lead to the imposition of the
following monetary penalties (hereinafter referred to as "Stipulated Penalties")
in accordance with the following provisions.

          1.   A Stipulated Penalty of $2,500 (which shall begin to accrue on
the day after the date the obligation became due) for each day, beginning 120
days after the effective date of this CIA and concluding at the end of the term
of this CIA, Fresenius fails to have in place any of the following:

               a.   a Compliance Officer;

               b.   a Business Unit Compliance Officer for each Business Unit
                    identified in Schedule A;
<PAGE>

               c.   a Corporate Compliance Committee and Business Unit
                    Compliance Committee for each Business Unit identified in
                    Schedule A;

               d.   a written Code of Conduct;

               e.   written Business Segment Compliance Guidelines;

               f.   a training program; or

               g.   a Confidential Disclosure Program;

          2.   A Stipulated Penalty of $2,500 (which shall begin to accrue on
the day after the date the obligation became due) for each day Fresenius fails
meet any of the deadlines to submit the Implementation Report or the Annual
Reports to the OIG.

          3.   A Stipulated Penalty of $2,000 (which shall begin to accrue on
the date the failure to comply began) for each day Fresenius:

               a.   hires or enters into a contract with an Ineligible Person at
the time when that person is listed by a federal agency as excluded, debarred,
suspended or otherwise ineligible for participation in the Federal health care
programs (this Stipulated Penalty shall not be demanded for any time period
during which Fresenius can demonstrate that it did not discover the person's
exclusion or other ineligibility after making a reasonable inquiry (as described
in section III.H) as to the status of the person);

               b.   employs or contracts with an Ineligible Person and that
person: (i) has responsibility for, or involvement with, Fresenius's business
operations related to the Federal health care programs or (ii) is in a position
for which the person's salary or the items or services rendered, ordered, or
prescribed by the person are paid in whole or part, directly or indirectly, by
Federal health care programs or otherwise with Federal funds
<PAGE>

(this Stipulated Penalty shall not be demanded for any time period during which
Fresenius can demonstrate that it did not discover the person's exclusion or
other ineligibility after making a reasonable inquiry (as described in section
III.H) as to the status of the person).

          4.  A Stipulated Penalty of $1,500 (which shall begin to accrue on the
date the Fresenius fails to grant access) for each day Fresenius fails to grant
access to the information or documentation as required in section VII of this
CIA.

          5.  A Stipulated Penalty of $1,000 (which shall begin to accrue 10
days after the date that OIG provides notice to Fresenius of the failure to
comply) for each day Fresenius fails to comply fully and adequately with any
obligation of this CIA, where the failure to comply does not form the basis for
Stipulated Penalties under the provisions of section X.A.1 through X.A.4.  In
its notice to Fresenius, OIG shall state the specific grounds for its
determination that the Fresenius has failed to comply fully and adequately with
the CIA obligation(s) at issue.  With respect to the Stipulated Penalty
provision described in this section X.A.5 only, the OIG shall not seek a
Stipulated Penalty if Fresenius demonstrates to the OIG's satisfaction that the
alleged failure to comply could not be cured within the 10-day period, but that:
(i) Fresenius has begun to take action to cure the failure to comply, (ii)
Fresenius is pursuing such action with due diligence, and (iii) Fresenius has
provided to OIG a reasonable timetable for curing the failure to comply.
<PAGE>

     B.  Payment of Stipulated Penalties.
         -------------------------------

          1. Demand Letter.  Upon a finding that Fresenius has failed to comply
with any of the obligations described in section X.A and determining that
Stipulated Penalties are appropriate, OIG shall notify Fresenius by personal
service or certified mail of (a) Fresenius's failure to comply; and (b) the
OIG's exercise of its contractual right to demand payment of the Stipulated
Penalties (this notification is hereinafter referred to as the "Demand Letter").

     Within ten (10) days of receiving the Demand Letter, Fresenius shall either
(a) cure the breach to the OIG's satisfaction and pay the applicable stipulated
penalties; or (b) request a hearing before an HHS administrative law judge
("ALJ") to dispute the OIG's determination of noncompliance, pursuant to the
agreed upon provisions set forth below in section X.D.  In the event Fresenius
elects to request an ALJ hearing, the Stipulated Penalties shall continue to
accrue until Fresenius cures, to the OIG's satisfaction, the alleged breach in
dispute; however, the payment of such accrued Stipulated Penalties shall remain
pending until the ALJ determination.  Failure to respond to the Demand Letter in
one of these two manners within the allowed time period shall be considered a
material breach of this CIA and shall be grounds for exclusion under section
X.C.

          2. Timely Written Requests for Extensions. Fresenius may submit a
timely written request for an extension of time to perform any act or file any
notification or report required by this CIA.  Notwithstanding any other
provision in this section, if OIG grants the timely written request with respect
to an act, notification, or report, Stipulated Penalties for failure to perform
the act or file the notification or report shall not begin to
<PAGE>

accrue until one day after Fresenius fails to meet the revised deadline set by
the OIG. Notwithstanding any other provision in this section, if OIG denies such
a timely written request, Stipulated Penalties for failure to perform the act or
file the notification or report shall not begin to accrue until two business
days after Fresenius receives OIG's written denial of such request. A "timely
written request" is defined as a request in writing received by OIG at least
five business days prior to the date by which any act is due to be performed or
any notification or report is due to be filed.

          3.  Form of Payment.  Payment of the Stipulated Penalties shall be
made by certified or cashier's check, payable to "Secretary of the Department of
Health and Human Services," and submitted to OIG at the address set forth in
section VI.

          4.  Independence from Material Breach Determination. Except as
otherwise noted, these provisions for payment of Stipulated Penalties shall not
affect or otherwise set a standard for the OIG's determination that Fresenius
has materially breached this CIA, which decision shall be made at the OIG's
discretion and governed by the provisions in section X.C, below.
<PAGE>

     C.  Exclusion for Material Breach of this CIA
         -----------------------------------------

          1.  Notice of Material Breach and Intent to Exclude.  The parties
agree that a material breach of this CIA by Fresenius constitutes an independent
basis for Fresenius's exclusion from participation in the Federal health care
programs (as defined in 42 U.S.C. (S) 1320a-7b(f)).  Upon a determination by OIG
that Fresenius has materially breached this CIA and that exclusion should be
imposed, the OIG shall notify Fresenius by certified mail of (a) Fresenius's
material breach; and (b) OIG's intent to exercise its contractual right to
impose exclusion (this notification is hereinafter referred to as the "Notice of
Material Breach and Intent to Exclude").

          2.  Opportunity to cure.  Fresenius shall have 30 days from the date
it receives the Notice of Material Breach and Intent to Exclude to demonstrate
to the OIG's satisfaction that:

               a.   Fresenius is in full compliance with this CIA;

               b.   the alleged material breach has been cured; or

               c.   the alleged material breach cannot be cured within the 30-
                    day period, but that: (i) Fresenius has begun to take action
                    to cure the material breach, (ii) Fresenius is pursuing such
                    action with due diligence, and (iii) Fresenius has provided
                    to OIG a reasonable timetable for curing the material
                    breach.

          3.  Exclusion Letter.  If at the conclusion of the 30-day period,
Fresenius fails to satisfy the requirements of section X.C.2, OIG may exclude
Fresenius from participation in the Federal health care programs.  OIG will
notify Fresenius in writing of its determination to exclude Fresenius (this
letter shall be referred to hereinafter as the
<PAGE>

"Exclusion Letter"). Subject to the Dispute Resolution provisions in section X.D
below, the exclusion shall go into effect 30 days after the date of the
Exclusion Letter. The exclusion shall have national effect and will also apply
to all other federal procurement and non-procurement programs. If Fresenius is
excluded under the provisions of this CIA, Fresenius may seek reinstatement
pursuant to the provisions at 42 C.F.R. (S)(S) 1001.3001-3004.

          4.  Material Breach.  A material breach of this CIA means:

               a. a failure by Fresenius to report a Reportable Event, take
               corrective action and pay the appropriate refunds, as provided in
               section III.J;

               b. repeated or flagrant violations of the obligations under this
               CIA, including, but not limited to, the obligations addressed in
               section X.A of this CIA;

               c. a failure to respond to a Demand Letter concerning the payment
               of Stipulated Penalties in accordance with section X.B above; or

               d. a failure to retain and use an Independent Review
               Organization for review purposes in accordance with section
               III.F.
<PAGE>

     D.  Dispute Resolution
         ------------------

          1.  Review Rights.  Upon the OIG's delivery to Fresenius of its Demand
Letter or of its Exclusion Letter, and as an agreed-upon contractual remedy for
the resolution of disputes arising under the obligation of this CIA, Fresenius
shall be afforded certain review rights comparable to the ones that are provided
in 42 U.S.C. (S) 1320a-7(f) and 42 C.F.R. Part 1005 as if they applied to the
Stipulated Penalties or exclusion sought pursuant to this CIA.  Specifically,
the OIG's determination to demand payment of Stipulated Penalties or to seek
exclusion shall be subject to review by an ALJ and, in the event of an appeal,
the Departmental Appeals Board ("DAB"), in a manner consistent with the
provisions in 42 C.F.R. (S)(S) 1005.2-1005.21.  Notwithstanding the language in
42 C.F.R. (S) 1005.2(c), the request for a hearing involving Stipulated
Penalties shall be made within 10 days of the receiving the Demand Letter and
the request for a hearing involving exclusion shall be made within 30 days of
the date of the Exclusion Letter.

          2.  Stipulated Penalties Review. Notwithstanding any provision of
Title 42 of the United States Code or Chapter 42 of the Code of Federal
Regulations, the only issues in a proceeding for Stipulated Penalties under this
CIA shall be (a) whether Fresenius was in full and timely compliance with the
obligations of this CIA for which OIG demands payment; (b) the period of
noncompliance and (c) with respect to a Stipulated Penalty authorized under
section X.A.5 only, whether the failure to comply could not be cured within the
10-day period, but that by the end of that period (i) Fresenius had begun to
take action to cure the failure to comply, (ii) Fresenius was and is pursuing
such action with due diligence, and (iii) Fresenius had provided to OIG a
reasonable timetable for curing the material breach which is being followed.
Fresenius
<PAGE>

shall have the burden of proving its full and timely compliance and the steps
taken to cure the noncompliance, if any. If the ALJ finds for OIG with regard to
a finding of a breach of this CIA and orders Fresenius to pay Stipulated
Penalties, such Stipulated Penalties shall become due and payable 20 days after
the ALJ issues such a decision notwithstanding that Fresenius may request review
of the ALJ decision by the DAB.

          3.  Exclusion Review. Notwithstanding any provision of Title 42 of the
United States Code or Chapter 42 of the Code of Federal Regulations, the only
issues in a proceeding for exclusion based on a material breach of this CIA
shall be (a) whether Fresenius was in material breach of this CIA; (b) whether
such breach was continuing on the date of the Exclusion Letter; and (c) whether
the alleged material breach could not have been cured within the 30 day period,
but that (i) Fresenius had begun to take action to cure the material breach
within that period, (ii) Fresenius has pursued and is pursuing such action with
due diligence, and (iii) Fresenius provided to OIG within that period a
reasonable timetable for curing the material breach. For purposes of the
exclusion herein, exclusion shall take effect only after an ALJ decision that is
favorable to the OIG. Fresenius's election of its contractual right to appeal to
the DAB shall not abrogate the OIG's authority to exclude Fresenius upon the
issuance of the ALJ's decision. If the ALJ sustains the determination of the OIG
and determines that exclusion is authorized, such exclusion shall take effect 20
days after the ALJ issues such a decision, notwithstanding that Fresenius may
request review of the ALJ decision by the DAB.

          4.  Finality of Decision.  The review by an ALJ or DAB provided for
above shall not be considered to be an appeal right arising under any statutes
or regulations.
<PAGE>

Consequently, the parties to this CIA agree that the DAB's decision (or the
ALJ's decision if not appealed) shall be considered final for all purposes under
this CIA.

XI.  Effective and Binding Agreement
     -------------------------------

     Consistent with the provisions in the Settlement Agreement pursuant to
which this CIA is entered, and into which this CIA is incorporated, Fresenius
and OIG agree as follows:

     A.  This CIA shall be binding on the successors, assigns, and transferees
of Fresenius;

     B.  This CIA shall become final and binding on the date the final signature
is obtained on the CIA;

     C.  No modifications to this CIA shall be made without the prior written
consent of the parties to this CIA;

     D.  This CIA supersedes the CIA entered into between the OIG and Spectra
Laboratories, Inc. executed on December 10, 1996 rendering the Spectra CIA no
longer in effect.

     E.  The undersigned Fresenius signatories represent and warrant that they
are authorized to execute this CIA.  The undersigned OIG signatory represents
that he is signing this CIA in his official capacity and that he is authorized
to execute this CIA.

<PAGE>

                            On Behalf of Fresenius



____________________________________________
BEN J. LIPPS                                              DATE
                                                               --------
President
Fresenius Medical Care Holdings, Inc.

/s/ John Markus
- --------------------------------------------
JOHN MARKUS                                               DATE 1/18/00
                                                               --------
Senior Vice President - Corporate Compliance
Fresenius Medical Care North America
<PAGE>

                 On behalf of the Office of Inspector General
                of the Department of Health and Human Services


/s/ Lewis Morris                                          1/18/00
- ---------------------------------------------             -----------
LEWIS MORRIS                                              DATE
Assistant Inspector General for Legal Affairs
Office of Inspector General
U. S. Department of Health and Human Services
<PAGE>

                                  Schedule A

List of Corporate Business Units for purposes of section III.A.2:

     Fresenius Dialysis Services - North

     Fresenius Dialysis Services - East

     Fresenius Dialysis Services - South

     Fresenius Dialysis Services - West

     Dialysis Products

     Spectra Renal Management
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


LABORATORY SERVICES AUDIT (SPECTRA EAST AND SPECTRA WEST ONLY)
- --------------------------------------------------------------

A.   LABORATORY INTERNAL MONITORING AND AUDITING PROCESSES

     1.  Conduct interviews with key administrators and staff to assess current
         operations and controls related to laboratory billing, coding,
         documentation and audit and monitoring practices (the inquiry will
         include, but may not be limited to, an overview of the revenue cycle,
         including registration, patient encounters, charge capture and
         documentation, claim submission and follow-up);

     2.  Document and review each laboratory's current policies and procedures
         related to laboratory billing, coding and documentation and monitoring
         and auditing practices, including those that address:

         [_]  Charge capture, documentation and submission processes;
         [_]  Medical documentation;
         [_]  Test requisition form design and content;
         [_]  Physician notices and acknowledgements;
         [_]  Advance beneficiary notices utilization;
         [_]  Test utilization monitoring;
         [_]  Selection of CPT-4 procedural codes, translation of ICD-9
              diagnosis codes;
         [_]  Billing for calculations;
         [_]  Reflex testing;
         [_]  Use of standing orders;
         [_]  Specimen collection fees and travel allowances;
         [_]  Composite rate billing;
         [_]  50/50 billing; and
         [_]  Record retention.

     3.  Review all current outpatient laboratory encounter superbill forms
         (e.g., encounter form) and other pertinent forms (e.g., an advanced
         beneficiary notice) to verify that they have been updated to address
         current regulatory requirements;

     4.  Identify independent consultant reports related to compliance
         activities and compliance related training materials;

     5.  Document and review all processes associated with internal monitoring
         and auditing activities (e.g., test utilization monitoring, standing
         order reviews, prospective/retrospective testing, etc.) as well as the
         protocols for corrective action;

                                       1
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


     6.  Report on compliance and internal audit activities conducted by
         Fresenius through interviews with respective compliance representatives
         and internal audit personnel; and

     7.  With respect to Federal health care programs other than Medicare
         perform the following procedures:

         a.   Select specific policies and procedures and test for compliance
              with respect to all Federal health care programs except Medicare
              (e.g., if there is a test utilization and monitoring policy and
              procedure, test that the lab is running the reports as indicated
              and that there is appropriate communications based upon the
              results of these reports);

         b.   Test that each laboratory is receiving, maintaining and
              communicating government and payer communications by requesting
              all compilations and reviewing the processes for communicating
              regulatory information to employees (e.g., review regulatory
              compendiums).

         c.   Document information system controls (e.g., missing data reports
              and test the main control points to verify these are being
              utilized appropriately by running "dummy" tests through the
              system.

NOTE - With respect to all reviews described below in paragraph B and C, the IRO
will review the medical documentation of the test ordered for Fresenius owned or
managed facilities ("Fresenius facilities") and, as such, will request medical
records from the facilities.  In testing medical documentation for those tests
where Medicare limits payment to certain diagnoses, the IRO will verify that the
medical record documentation indicates that the patient's condition at the time
of the test being ordered is consistent with the selected diagnosis or ICD-9
code used to support the medical necessity of the test (e.g., test subject to
local medical review policies) (hereinafter referred to as "medical record
documentation test").  The medical record documentation test shall be performed
by clinical personnel with ESRD expertise.  If the physician has stated the
diagnosis in the medical record, the IRO will not question that determination by
the physician.  For facilities not owned or managed by Fresenius ("non-Fresenius
facilities"), the IRO will only conduct an audit of medical documentation to the
extent of an evaluation of the presence of an appropriate diagnosis on the
applicable requisition forms where required, and that it matches the diagnosis
submitted on the claim form (hereinafter referred to as "diagnosis confirmation
test").

                                      2
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


B.   TEST FOR COMPLIANCE WITH FREQUENCY RELATED ISSUES FOR MEDICARE CLAIMS ONLY
     (FOR BOTH SPECTRA WEST AND SPECTRA EAST ONLY).

     1.  The IRO will request that Spectra East and Spectra West generate a
         frequency and utilization report for 100 randomly selected patients
         each for a period of three months that details all frequency based
         tests performed for each patient for the quarter.

     2.  The IRO will request that Spectra East and Spectra West generate all
         Medicare related billing data for each of the 100 patients for the
         audit quarter.

     3.  The IRO will conduct an analysis of these reports (i.e., categorize and
         count the number of tests for the audit period for each patient and
         compare the results against the regulatory mandates for each test). The
         analysis will specifically include a review of the utilization and
         frequency reports for the following:

         [_]  All tests included in the composite rate;
         [_]  All tests billed outside the composite rate subject to Medicare
              frequency limits; and
         [_]  Appropriateness of 50/50 rule billing.

     4.  The IRO will document as part of the IRO report any instances that
         indicate that FMC billed for tests outside the frequency mandated by
         regulatory requirements.

     5.  For any instances that indicate that FMC billed for tests outside the
         frequency mandated by regulatory requirements, the IRO will perform the
         clinical medical documentation and the diagnosis confirmation test.

     6.  A Statistically Valid Sample Frequency Issue Audit shall be performed
         for the laboratory if the medical record documentation test review
         results in an error rate in terms of gross dollar overpayments that
         equals or exceeds 5%. This review shall follow the statistically valid
         sample audit requirements set forth in the CIA. Nothing in this section
         shall relieve Fresenius of its responsibility to correct inaccuracies
         noted in its original sample. The 5% financial error threshold only
         applies to criteria for sample expansion, not for extrapolation of an
         error rate;

     7.  In the event that a statistically valid sample audit is required under
         paragraph 6 above, the population will consist of Medicare laboratory
         claims grouped by quarter for each beneficiary (i.e., beneficiary
         quarter) that were processed for payment during the period of audit;
         the sample unit shall be a beneficiary quarter represented by all
         laboratory claims and related services contained in that beneficiary
         quarter.

                                       3
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


     8.  If the IRO can illustrate through an information system and/or
         management report analysis that the frequency issues resulted from a
         systemic or operation controls gap, then the IRO will quantify the
         extent of the issue and make the appropriate report to FMC.

C.   CONDUCT A STATISTICALLY VALID SAMPLE AUDIT, INCLUDING PROBE AUDIT OF
     MEDICARE CLAIMS ONLY  (FOR BOTH SPECTRA WEST AND SPECTRA EAST ONLY).

     1.  The IRO will conduct a statistical review of claims by both
         laboratories to review the following issues (as the frequency issues
         have been carved out as indicated above):

         [_]  Appropriateness of billing for bundled tests;
         [_]  Incidence of duplicate billing;
         [_]  Presence of CPT-4 procedural and/or ICD-9 diagnosis coding (see
              note below);
         [_]  Incidence of billing for services not performed;
         [_]  Incidence of billing for tests performed, but not ordered;
         [_]  Inclusion of dates of services; and
         [_]  Incidence of failure to bill for tests performed.

     2.  This review will follow the statistically valid sample audit
         requirements set forth in the CIA. The sample unit will be defined as
         one claim submitted and all the tests associated with that claim.

     3.  If the IRO can illustrate through an information system and/or
         management report analysis that an issue or an error resulted from
         systemic or operational control gap, then the IRO will report the issue
         to FMC to remit all overpayments associated with that issue.

     4.  For any claims and services that have been identified as being an
         error, the IRO will report to Fresenius and develop an estimate of any
         possible overpayment.

D.   AFTER THE FIRST YEAR UNDER THE CIA, FRESENIUS MAY REQUEST THE OIG TO ALLOW
     THE LABORATORY SERVICES AUDIT REQUIRED BY THE CIA AND DETAILED IN THIS
     WORKPLAN TO BE PEFORMED BY FRESENIUS INTERNAL AUDIT PERSONNEL.  THE OIG
     WILL DECIDE SUCH REQUESTS IN ITS SOLE DISCRETION.  THE IRO WILL REVIEW THE
     METHODOLOGY AND RESULTS OF THE AUDITS PERFORMED BY FRESENIUS INTERNAL AUDIT
     STAFF.  THE REVIEW WILL INCLUDE RE-PERFORMING ALL AUDIT STEPS ON AT LEAST
     10% OF CLAIMS REVIEWED BY FRESENIUS.

                                      4
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


CREDIT BALANCE AUDIT
- --------------------

1.   Review procedures established for the identification and resolution of
     credit balances. Include a review, including a detailed analysis, of the
     items that were written off the accounting records during the audit period
     to determine, where appropriate, if there were any Medicare overpayments
     that should have been reported on Form HCFA 838 and refunded upon request
     to the fiscal intermediary;

2.   Identify and document control points for resolving and reporting credit
     balances (e.g., refund to payer, correction of posting error, corrected
     billing);

3.   Identify individuals responsible for accurately identifying, compiling and
     reporting credit balances and for identifying, monitoring and processing
     refunds;

4.   Determine whether the billing system has the ability to print out the
     individual patient accounts by payer class and whether Federal health care
     program credit balances are properly identified;

5.   Perform an analysis of a limited sample from the credit balances data
     obtained in step 4 and identify and review any adjustments that are
     inconsistent with existing policies and procedures;

6.   Obtain the most current listing of all credit balances and select a sample
     of at least 10 dates of service and test for the following:

     [_] Federal health care program credit balances were identified within a
         reasonable time once payment was received and posted;
     [_] Credit balance status was analyzed, documented and appropriately
         refunded;
     [_] All credit balances for Federal health care programs are refunded or
         otherwise resolved upon request of the fiscal intermediary in a timely
         manner; and
     [_] Controller or accountant, on a monthly or quarterly basis, reviews the
         credit balance reports and associated adjustments.

7.   From the selected sample tie to the HCFA 838, where appropriate, and
     confirm the following:

     [_] The credit balance was reported on form HCFA 838 and that Medicare
         guidelines were followed (e.g., documenting the reason for the credit
         balance); and
     [_] The appropriate signatures exist on the form HCFA 838 per Medicare
         guidelines.

8.   Where appropriate, assess that the form HCFA 838 is completed, signed and
     submitted according to Medicare guidelines on a quarterly basis even if no
     credits exist.

                                      5
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


COMPLIANCE PROGRAM IMPLEMENTATION
- ---------------------------------

1.   Perform procedures to review and document the mandated terms and conditions
     of the CIA with respect to the implementation of a Corporate Integrity
     Agreement ("CIA") and verify Fresenius' compliance. Specifically, the IRO
     will note the following:

     [_] Identify if Fresenius has an appointed compliance oversight structure,
         including the Compliance Officer and a Compliance Committee (i.e.,
         functional area representation), and the communication within the
         oversight structure (e.g., Board of Director communications, reporting
         to the CEO, etc.) and between key senior management and employees
         (e.g., action plans, follow-up reports, etc.);
     [_] Confirm training and education programs were conducted in accordance
         with the terms of the CIA;
     [_] Confirm the level of participation in the training and educational
         program are in accordance with the terms of the CIA;
     [_] Confirm that the internal process for obtaining, disseminating and
         maintaining pertinent regulatory communications, bulletins, updates,
         alerts, etc. from government agencies, regulatory bodies and third-
         party payers is in accordance with the terms of the CIA;
     [_] Review and record that the confidential disclosure program (i.e.,
         hotline), including the process to identify and track reports,
         investigate and resolve (i.e., internal corrective action and/or
         resubmission of claims) issues and communicate important information
         back the employees has been implemented and is functioning in
         accordance with the terms of the CIA;
     [_] Identify and record all internal compliance audit reports;
     [_] Review and record all internal (e.g., Board of Directors) and external
         compliance reports.

2.   Conduct interviews with management and employees as well as conduct a
     review of policies, reports, hotline logs and training schedules, etc.

3.   The IRO will review Fresenius' procedures and documentation to verify that
     Fresenius has processes to ensure that they have not submitted claims and
     they have not sought payment for unallowable costs where specifically
     prohibited by the Settlement Agreement or Federal health care program
     requirements;

                                      6
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


CONTRACT REVIEW
- ---------------

1.   In Year 1, identify 30 randomly selected contracts with potential referral
     sources from the total population of Fresenius contracts;

2.   Obtain from Fresenius Office of General Counsel ("OGC") a copy of all the
     "standard" contracts utilized and compare the 30 randomly selected
     contracts against the standard language to verify consistency;

3.   Verify that OGC and/or external counsel have reviewed and approved the form
     contracts and any exceptions made;

4.   The IRO shall raise any discrepancies to OGC and/or external counsel for
     reconciliation; and

5.   For the remaining duration of the CIA, IRO shall review a random sample of
     new contracts following the same processes.


                                      7
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


COST REPORT REVIEW
- ------------------

1.   For each year of the CIA, the IRO will randomly select 15 Medicare facility
     cost reports and select the home office cost report and review the related
     processes, including any policies and procedures, for determining the
     appropriateness of allowable and non-allowable costs, accounting for prior
     year adjustments, and the mechanism and process for rolling up to the
     Fresenius corporate cost report. Procedures to be performed will include:

     [_] Read the cost report and related working papers prepared and filed for
         the audit year;
     [_] Interview Fresenius representatives responsible for reporting
         information to be included in the cost reports to evaluate the
         processes of data collection and submission;
     [_] Interview Fresenius representatives responsible for preparing the cost
         report and related working papers to determine the communication
         process within Fresenius and to evaluate cost reporting procedures and
         the development of supporting documentation;
     [_] Analyze general ledger accounts to verify that unallowable expenses are
         being handled according to Fresenius policy and Medicare program
         requirements;
     [_] Analyze existing system that accumulates Medicare bad debts for
         inclusion in the Medicare cost report, including a review of the A/R
         collection process to ensure due diligence requirements are being
         followed ("bad debt review");
     [_] and analyze the HCFA Cost Report Form 339 for purposes of cost
         reporting compliance;
     [_] Read and analyze the IRS Form 990 for purposes of determining
         consistency in federal reporting activities;
     [_] Read and analyze the cost report working papers and other documentation
         supporting the information reported in the cost report; and
     [_] Evaluating past cost report intermediary audit findings.

2.   The IRO will review the cost report for the following potential unallowable
     expenses, to confirm that they are reported appropriately:

     [_] Lobbying expenses;
     [_] Political contributions;
     [_] Medical office buildings;
     [_] Non-reimbursable cost Centers; and
     [_] Special event costs.

3.   For each year of the CIA, the IRO will randomly select an additional 15
     Medicare facility cost reports for purposes of performing the bad debt
     review only.

                                      8
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


4.   After the first year under the CIA, Fresenius may request the OIG to allow:
     (1) less than 15 facility cost reports to be audited for all issues
     (however, there shall always be a minimum of 10 cost reports audited for
     all issues and an additional minimum of 15 facility cost reports for
     purposes of bad debt review only); (2) Fresenius internal audit staff to
     perform more of the audits (however, the IRO shall always perform at least
     50% of the audits). The OIG will decide such request in its sole
     discretion. The IRO will review the methodology and results of the audits
     performed by Fresenius internal audit staff. The review will include re-
     performing all audit steps on at least 10% of cost reports reviewed by
     Fresenius.

                                      9
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


DIALYSIS SERVICES AUDIT: BILLING CENTERS
- ----------------------------------------

A.   INTERNAL MONITORING AND AUDITING PROCESSES - HEMODIALYSIS MODALITY

     The IRO shall select a random sample of at least 6 billing centers pursuant
     to section B below. In addition, Fresenius internal audit staff shall
     perform audits on 6 additional randomly selected billing centers following
     this methodology.

     For each dialysis billing center selected:

     1.  Create an inventory of current policies and procedures related to
         dialysis service billing, coding and documentation, and monitoring and
         auditing practices;

     2.  Conduct site visits and perform interviews at the selected billing
         centers with key administrators, clinical supervisors or directors and
         staff to assess current operations and controls related to dialysis
         billing, coding, documentation and audit and monitoring practices;

     3.  Test that identified policies and procedures are followed by reviewing:
         (a) attendance records of employee training programs related to billing
         compliance; (b) reports used to evaluate compliance; and (c) results of
         internal audits used to measure billing accuracy and compliance with
         policies and procedures;

     4.  Review current documentation forms and electronic record keeping
         methodology, as well as the interface between electronic and paper
         records, for compliance with HCFA regulatory requirements;

     5.  Review the procedures of billing centers for obtaining and distributing
         government and payer communications;

     6.  Identify and review independent consultant reports related to
         compliance activities and training materials for compliance with
         regulatory requirements;

     7.  Obtain and review processes associated with internal monitoring and
         auditing activities (e.g., adequacy of monitoring, utilization
         monitoring, physician orders) as well as protocols for corrective
         action; and

     8.  Identify information system controls (e.g., missing data reports) and
         test that these are being utilized and reviewed by appropriate
         personnel.

                                      10
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


B.   CONDUCT A PROBE AUDIT OF 30 SAMPLE UNITS AT 6 RANDOMLY SELECTED BILLING
     CENTERS FOR ALL HEMODIALYSIS MODALITY BILLING ACTIVITY

     1.  Obtain a complete listing of all claims reimbursed by the Federal
         health care programs during the audit period;

     2.  For purposes of Dialysis Services Audit, all billing centers shall be
         included within the random selection. The selection process shall be
         designed so that the probability of a billing center being selected is
         proportional to its dollar volume of claims submitted to the Federal
         health care programs;

     3.  Randomly select a probe sample of 30 sample units from each of the six
         randomly selected billing centers;

     4.  For purposes of the Dialysis Services Audit, the sample unit shall be a
         claim submitted to the Federal health care programs during the audit
         period;

     5.  Request all billing activity (e.g., claims submitted, account history,
         EOMBs) related to the test period for all members of the sample;

     6.  Request medical records supporting the charges represented in the
         billing activity for the test period;

     7.  Analyze each unit of the sample according to procedures to evaluate
         potential issues, including, but not limited to, the following (i.e.,
         review the medical record for the following steps and indicate the
         criteria in the appropriate field):

         [_]  Informed consent;
         [_]  Completeness of medical record;
         [_]  Long term program documentation;
         [_]  Patient care plan; and
         [_]  Bill data testing for accuracy of charges including dialysis
              encounters, pharmacy and diagnostic services.

     7.  A Statistically Valid Sample Audit shall be performed for each billing
         center for which the error rate in terms of gross dollar overpayments
         equals or exceeds 5%. This review shall follow the statistically valid
         sample audit requirements set forth in the CIA. Nothing in this section
         shall relieve Fresenius of its responsibility to correct inaccuracies
         noted in its probe sample. The 5% financial error threshold only
         applies to criteria for sample expansion, not for extrapolation of an
         error rate; and

                                      11
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


     8.  Summarize findings for sample.

C.   SUBSEQUENT YEAR PROBE AUDIT OF 30 SAMPLE UNITS

     1.  For each year under the CIA, the IRO and Fresenius internal audit shall
         conduct the audits described in this section for at least 12 randomly
         selected billing centers. After the first year under the CIA, Fresenius
         may request the OIG to allow: (1) less than 12 billing centers to be
         audited (however, there shall always be a minimum of 6 billing centers
         audited); and (2) Fresenius internal audit staff to perform more of the
         audits (however, the IRO shall always perform at least 3 of the
         audits). The OIG will decide such request in its sole discretion. The
         IRO will review the methodology and results of the audits performed by
         Fresenius internal audit staff. The review will include re-performing
         all audit steps on at least 10% of claims reviewed by Fresenius.

D.   CONTINGENT UPON THE RESULTS OF THE PROBE AUDIT - CONDUCT A STATISTICALLY
     VALID SAMPLE AUDIT AS REQUIRED IN B.8 ABOVE.  THE STATISTICALLY VALID
     SAMPLE AUDIT SHALL BE CONDUCTED USING STEPS B.4-6, AND 8 ABOVE

E.   CONDUCT PROBE AUDIT OF 30 SAMPLE UNITS FOR METHOD II BILLING OF PERITONEAL
     MODALITY BILLING ACTIVITY.

     1.  Obtain a complete listing of all claims reimbursed by Federal health
         care  programs during the audit period;

     2.  Randomly select a probe sample of 30 sample units from the billing
         center;

     3.  For purposes of the Method II Audit, the sample unit shall be a claim
         submitted to the Federal health care programs during the audit period;

     4.  Request all billing activity (e.g., claims submitted, account history,
         EOMBs) related to the test period for all members of the sample;

     5.  Request medical records supporting the charges represented in the
         billing activity for the test period;

     6.  Test each claim according to procedures to determine potential issues,
         including, but not limited to, the following (i.e., review the medical
         record and billing data for the following steps and indicate the
         criteria in the appropriate field):

         [_]  Intake process;
         [_]  Charge entry process;


                                      12
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


         [_]  Billing process;
         [_]  Assignment of codes;
         [_]  Incidence of billing for services not performed;
         [_]  Incidence of billing for tests performed, but not ordered;
         [_]  Inclusion of dates of services;
         [_]  Incidence of failure to bill for tests performed; and
         [_]  Incidence of duplicate billing.

     7.  A Statistically Valid Sample Audit shall be performed for each billing
         center for which the error rate in terms of gross dollar overpayments
         equals or exceeds 5%. This review shall follow the statistically valid
         sample audit requirements set forth in the CIA. Nothing in this section
         shall relieve Fresenius of its responsibility to correct inaccuracies
         noted in its probe sample. The 5% financial error threshold only
         applies to criteria for sample expansion, not for extrapolation of an
         error rate;

     8.  The statistically valid sample audit shall be conducted using steps (B-
         4 through B-9) E.1-5 above, except that the random sample referred to
         in E.2 shall be a full sample rather than a probe sample; and

     9.  Summarize findings for the sample.

                                      13
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


IDPN SERVICES AUDIT
- -------------------

A.   Internal Monitoring and Auditing Process

     1.  Through interviews with key personnel, verify the existence of controls
         and/or policies and procedures related to the following issues and/or
         activities:

         [_]  Documentation verifying that the patient meets HCFA coverage
              criteria;
         [_]  Clinical Nutrition Summary Form and/or IDPN Information Sheet to
              the extent utilized
         [_]  Certificate of medical necessity; and
         [_]  Identify and record internal and compliance audits conducted by
              Fresenius.

B.   CONDUCT PROBE AUDIT OF 30 SAMPLE UNITS AT THE IDPN BILLING CENTER

     1.  Obtain a complete listing of all claims reimbursed by the Medicare and
         Medicaid programs during the audit period;

     2.  Randomly select a probe sample of 30 sample units (for the purpose of
         this audit, the sample unit will be a claim and the sample universe
         will specifically exclude claims submitted with a denial modifier);

     3.  Request all billing activity (e.g., claims submitted, account history,
         EOMBs) related to the test period for all members of the sample;

     4.  Request medical records supporting the charges represented in the
         billing activity for the test period;

     5.  Test each sampling unit according to procedures to determine if
         patients receiving IDPN meet the applicable parenteral nutrition
         coverage criteria;

     6.  A Statistically Valid Sample Audit shall be performed for the IDPN
         billing center if the error rate in terms of gross dollar overpayment
         equals or exceeds 5%. This review shall follow the statistically valid
         sample audit requirements set forth in the CIA. Nothing in this section
         shall relieve Fresenius of its responsibility to correct inaccuracies
         noted in its probe sample. The 5% financial error threshold only
         applies to criteria for sample expansion, not for extrapolation of an
         error rate;

     7.  Conduct the full sample audit following the same processes referenced
         in B1-B5 herein, except that the random sample referred to in B.2 shall
         be a full sample rather than a probe sample; and

     8.  Summarize findings for aggregate analysis.


                                      14
<PAGE>

                                  SCHEDULE B

                          FRESENIUS CIA IRO WORKPLAN


CLINICAL DIAGNOSTIC SERVICES
- ----------------------------

A.   INTERNAL MONITORING AND AUDITING PROCESS


     1.  Through interviews with key personnel, verify the existence of controls
         and/or policies and procedures related to the following issues and/or
         activities:

         [_]  Documentation verifying that the patient meets HCFA coverage
              criteria;
         [_]  Documentation of medical necessity; and
         [_]  Identify and record internal and compliance audits conducted by
              Fresenius.

B.   CONDUCT PROBE AUDIT OF 30 SAMPLE UNITS AT THE CLINICAL DIAGNOSTIC BILLING
     CENTER

     1.  Obtain a complete listing of all claims reimbursed by the Federal
         health care programs during the audit period;

     2.  Randomly select a probe sample of 30 sample units (for the purpose of
         this audit, the sample unit will be a claim and the sample universe
         will specifically exclude claims submitted with a denial modifier);

     3.  Request all billing activity (e.g., claims submitted, account history,
         EOMBs) related to the test period for all members of the sample;

     4.  Request medical records supporting the charges represented in the
         billing activity for the test period;

     5.  Test each sampling unit according to procedures to determine if
         patients receiving clinical diagnostic services meet the applicable
         coverage criteria;

     6.  A Statistically Valid Sample Audit shall be performed for the clinical
         diagnostic services billing center if the error rate in terms of gross
         dollar overpayment equals or exceeds 5%. This review shall follow the
         statistically valid sample audit requirements set forth in the CIA.
         Nothing in this section shall relieve Fresenius of its responsibility
         to correct inaccuracies noted in its probe sample. The 5% financial
         error threshold only applies to criteria for sample expansion, not for
         extrapolation of an error rate;

     7.  Conduct the full sample audit following the same processes referenced
         in B1-B5 herein, except that the random sample referred to in B.2 shall
         be a full sample rather than a probe sample; and

     8. Summarize findings for aggregate analysis.

                                      15

<PAGE>

                                                                    EXHIBIT 10.2

                       SETTLEMENT AGREEMENT AND RELEASE
                        --------------------------------

                                I. PARTIES
                                   -------

     This Settlement Agreement ("Agreement") is entered into by and among:

     A.   The United States of America, acting through its Department of Justice
and the United States Attorney's Office for the District of Massachusetts, on
behalf of the United States Department of Health and Human Services through its
Office of Inspector General ("HHS-OIG"); the United States Department of Defense
through its TRICARE Support Office ("TSO")(formerly the Office of the Civilian
Health and Medical Program of the Uniformed Services), a field activity of the
Office of the Secretary of Defense, through counsel; the United States Office of
Personnel Management ("OPM"), through the Director of Programs; and the United
States Department of Veteran Affairs ("VA"), through counsel; (collectively the
preceeding will be referred to as the "United States"); and

     B.   LIFECHEM, INC. ("LIFECHEM") a Delaware corporation and wholly owned
subsidiary of National Medical Care, Inc.; NMC Medical Products, Inc.
("MPD")(formerly known as National Medical Care, Medical Products Division,
Inc., and before that as Erika, Inc.), a Delaware corporation and wholly owned
indirect subsidiary of National Medical Care, Inc.; National Medical Care, Inc.
("NMC"), a Delaware corporation and a wholly owned subsidiary of Fresenius
Medical Care Holdings, Inc.; and Fresenius Medical Care Holdings, Inc. (d/b/a
Fresenius Medical Care North America), a New York corporation ("FMCH"); and

     C.   Jay A. Buford, individually; Russell J. Davis, individually; and
William L. Schoff, individually (collectively the "Relators").

     Collectively, all of the above will be referred to as "the Parties."
<PAGE>

                                 II. PREAMBLE
                                     --------

     A.   WHEREAS, this Agreement addresses the United States' civil claims
against LIFECHEM, MPD, NMC, and FMCH under the federal statutes and common law
doctrines set forth in Paragraph 8 below, for the conduct described in Preamble
Paragraphs K through Y below, the conduct described in public filings in United
                                                                         ------
States of America v. NMC Homecare, Inc., LIFECHEM, INC., and NMC Medical
- ------------------------------------------------------------------------
Products, Inc., Criminal Action No. [to be assigned](District of
- --------------
Massachusetts)(the "Criminal Action"), and the conduct alleged in the Relators'
Complaint and Amended Complaint in United States ex rel. Jay A. Buford, Russell
                                   --------------------------------------------
J. Davis and William L. Schoff v. Lifechem, Inc.; Erika, Inc. (d/b/a National
- -----------------------------------------------------------------------------
Medical Care, Medical Products Division); National Medical Care, Inc.; Fresenius
- --------------------------------------------------------------------------------
Medical Care AG; Fresenius National Medical Care Holdings, Inc. (d/b/a Fresenius
- --------------------------------------------------------------------------------
Medical Care--North America); and Spectra Laboratories, Inc., Civil Action No.
- ------------------------------------------------------------
95-10706-NG (District of Massachusetts)(originally filed December 15, 1994 in
the Middle District of Tennessee, Civil No. 3-94-1105 and transferred to
District of Massachusetts in 1995)(the "Civil Action");

     B.   WHEREAS, at all relevant times, NMC was a national provider of
outpatient dialysis services to patients with end stage renal disease.  One of
NMC's subsidiaries was LIFECHEM which owned and operated independent clinical
laboratories in Northvale, New Jersey (later, Rockleigh, New Jersey), and
Woodland Hills, California, and which specialized in providing laboratory blood
testing services for dialysis patients.  Another one of NMC's subsidiaries was
MPD, which manufactured, distributed, marketed and sold products for use in the
dialysis setting, including laboratory blood testing services from LIFECHEM;

     C.   WHEREAS, LIFECHEM has entered into an agreement (the "LIFECHEM Plea
Agreement") to plead guilty on or before January 19, 2000, or on such other date
as may be determined by the Court, to Count Two of the Information in the
Criminal Action alleging a violation of Title 18, United States Code, Section
286, namely, a conspiracy to defraud the
<PAGE>

United States through the submission of false and fraudulent claims for payment
for certain laboratory blood tests conducted for dialysis patients;

     D.   WHEREAS, MPD has entered into an agreement (the "MPD Plea Agreement")
to plead guilty on or before January 19, 2000, or on such other date as may be
determined by the Court, to Count Three of the Information in the Criminal
Action alleging a violation of Title 18, United States Code, Section 371,
namely, a conspiracy to commit an offense against the United States, to wit, to
offer and pay remuneration to induce dialysis facilities to order and arrange
for the ordering from LIFECHEM of clinical laboratory blood testing services
conducted for dialysis patients, and paid for in whole or in part by Medicare,
in violation of Title 42, United States Code, Section 1320a-7b(b)(2)(B);

     E.   WHEREAS, LIFECHEM submitted or caused to be submitted claims for
payment to the Medicare program, Title XVIII of the Social Security Act, 42
U.S.C. (S)(S) 1395-1395ddd (1997), which is administered by the United States
Department of Health and Human Services;

     F.   WHEREAS, LIFECHEM submitted or caused to be submitted claims for
payment to the TRICARE Program (also known as the Civilian Health and Medical
Program of the Uniformed Services), 10 U.S.C. (S)(S) 1071-1106, which is
administered by the Department of Defense through the TSO;

     G.   WHEREAS, LIFECHEM submitted or caused to be submitted claims for
payment to the Federal Employees Health Benefit Program ("FEHBP"), 5 U.S.C.
(S)(S) 8901-8914, which is administered by OPM;

     H.   WHEREAS, LIFECHEM submitted or caused to be submitted claims for
payment to the Railroad Retirement Medicare program ("Railroad Retirement
Medicare"), established under the Railroad Retirement Act of 1974, 45 U.S.C.
(S)(S) 231-231v, which is paid from the Medicare Trust Fund, and administered by
the United States Railroad Retirement Board ("RRB");
<PAGE>

     I.   WHEREAS, LIFECHEM submitted or caused to be submitted claims for
payment to the Veteran Affairs Program, 38 U.S.C. (S)(S) 1701-1743, which is
administered by the VA;

     J.   WHEREAS, LIFECHEM submitted or caused to be submitted claims for
payment to the Medicaid programs, 42 U.S.C. (S)(S) 1396-1396v (1997), of the
states of Alabama, Arizona, Arkansas, California, Colorado, Connecticut,
Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky,
Louisiana, Maine, Maryland, Massachusetts, Michigan, Mississippi, Missouri,
Montana, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio,
Oregon, Pennsylvania, South Carolina, Tennessee, Texas, Utah, Virginia,
Washington, West Virginia, Wisconsin, and the District of Columbia (the
"Participating States");

     K.   WHEREAS, the United States alleges that at various times from August
1, 1991 through November 1, 1999, LIFECHEM and MPD violated federal statutes
and/or common law doctrines specified in Paragraph 9 below in connection with
the marketing, sale, pricing and billing of testing for Hepatitis B IgM core
(designated by Current Procedural Terminology ("CPT") Code 86290) both
individually and as part of LIFECHEM's Hepatitis Panels (LIFECHEM 011 and 031)
and Profiles III and IV (LIFECHEM 003 and 004), by submitting or causing to be
submitted false and fraudulent claims for these tests that LIFECHEM and MPD knew
were not specifically ordered by physicians, and further knew were not
reasonable and necessary for the diagnosis or treatment of illness or injury,
and these tests were billed by and paid to LIFECHEM;

     L.   WHEREAS, the United States alleges that at various times from August
1, 1991 through November 1, 1999, LIFECHEM and MPD violated federal statutes
and/or common law doctrines specified in Paragraph 9 below in connection with
the marketing, sale, pricing and billing of testing for Hepatitis C antibody
(CPT Code 86302) both individually and as a part of LIFECHEM's Hepatitis Panels
(LIFECHEM 011 and 031) and Profiles III and IV (LIFECHEM 003 and 004), by
submitting or causing to be submitted false and fraudulent claims for these
tests
<PAGE>

that LIFECHEM and MPD knew were not specifically ordered by physicians, and
further knew were not reasonable and necessary for the diagnosis or treatment of
illness or injury at the frequency provided, and these tests were billed by and
paid to LIFECHEM;

     M.   WHEREAS, the United States alleges that at various times from August
1, 1991 through November 1, 1999, LIFECHEM and MPD violated federal statutes
and/or common law doctrines specified in Paragraph 9 below in connection with
the marketing, sale, pricing and billing of testing for Hepatitis B surface
antibody (CPT 86291) and Hepatitis B surface antigen (CPT 86287) both
individually and as part of LIFECHEM's Hepatitis Panels (LIFECHEM 011 and 031)
and Profiles III and IV (LIFECHEM 003 and 004), by submitting or causing to be
submitted false and fraudulent claims for these tests that LIFECHEM and MPD knew
were not reasonable and necessary for the diagnosis or treatment of illness or
injury at the frequency provided, and these tests were billed by and paid to
LIFECHEM;

     N.   WHEREAS, the United States alleges that at various times from March 1,
1991 through November 1, 1999, LIFECHEM and MPD violated federal statutes and/or
common law doctrines specified in Paragraph 9 below in connection with the
marketing, sale, pricing and billing of testing for magnesium (CPT 83735 and
83750) both individually and as part of LIFECHEM's CA/PHOS Product Panel
(LIFECHEM 019), by submitting or causing to be submitted false and fraudulent
claims for these tests that LIFECHEM and MPD knew were not specifically ordered
by physicians, and further knew were not reasonable and necessary for the
diagnosis or treatment of illness or injury, and these tests were billed by and
paid to LIFECHEM;

     O.   WHEREAS, the United States alleges that at various times from January
1, 1991 through November 1, 1999, LIFECHEM and MPD violated federal statutes
and/or common law doctrines specified in Paragraph 9 below in connection with
the marketing, sale, pricing and billing of tests for apolipoprotein (CPT 82172)
both individually and as part of LIFECHEM's Lipid Panel (LIFECHEM 009), by
submitting or causing to be submitted false and fraudulent
<PAGE>

claims for these tests that LIFECHEM and MPD knew were not specifically ordered
by physicians, and further knew were not reasonable and necessary for the
diagnosis or treatment of illness or injury, and these tests were billed by and
paid to LIFECHEM;

     P.   WHEREAS, the United States alleges that at various times from January
1, 1991 through November 1, 1999, LIFECHEM violated federal statutes and/or
common law doctrines specified in Paragraph 9 below in connection with the
marketing, sale, pricing and billing of automated testing for platelets (CPT
85595) performed on the same day as a composite rate test for a Complete Blood
Count ("CBC")(CPT 85025), by submitting false and fraudulent claims for these
tests that LIFECHEM knew were not separately ordered by physicians, and further
knew were not separately billable under applicable Medicare rules because they
were included as part of the CBC for which Medicare had already paid, and these
tests were billed by and paid to LIFECHEM;

     Q.   WHEREAS, the United States alleges that at various times from January
1, 1994 through November 1, 1999, LIFECHEM and MPD violated federal statutes
and/or common law doctrines specified in Paragraph 9 below in connection with
the marketing, sale, pricing and billing of tests for prealbumin (CPT 84134), by
submitting or causing to be submitted false and fraudulent claims for these
tests that LIFECHEM and MPD knew were not reasonable and necessary for the
diagnosis or treatment of illness or injury at the frequency provided, and these
tests were billed by and paid to LIFECHEM;

     R.   WHEREAS, the United States alleges that at various times from January
1, 1995 through November 1, 1999, LIFECHEM violated federal statutes and/or
common law doctrines specified in Paragraph 9 below in connection with the
marketing and billing of individual chemistry tests ordered and performed on the
same day as automated chemistry panels, known as LIFECHEM's "Chem Composite" and
"CAPD Chem Composite" panels (LIFECHEM 120H and 120P), by submitting false and
fraudulent claims for these tests that
<PAGE>

LIFECHEM knew were not separately billable under applicable Medicare rules, and
these tests were billed by and paid to LIFECHEM;

     S.   WHEREAS, the United States alleges that at various times from June 1,
1990 through November 1, 1999, LIFECHEM and MPD violated federal statutes and/or
common law doctrines specified in Paragraph 9 below in connection with the
billing of automated chemistry tests ordered and performed on the same day as
the composite rate "Chem 20" (LIFECHEM 120), by submitting or causing to be
submitted false and fraudulent claims for these tests that LIFECHEM and MPD knew
were not billable under applicable Medicare rules because they were included in
the Chem 20 for which Medicare had already paid, and these tests were billed by
and paid to LIFECHEM;

     T.   WHEREAS, the United States alleges that at various times from June 1,
1990 through November 1, 1999, LIFECHEM violated federal statutes and/or common
law doctrines as specified in Paragraph 9 below in connection with the billing
of composite rate tests when the LIFECHEM computer periodically failed to
identify them, by submitting or causing to be submitted false and fraudulent
claims for these tests that LIFECHEM knew were not separately billable under
applicable Medicare rules because they were already reimbursed by Medicare
through the composite rate payment to the dialysis facility, and these tests
were billed by and paid to LIFECHEM;

     U.   WHEREAS, the United States alleges that at various times from June 1,
1990 through November 1, 1999, LIFECHEM violated federal statutes and/or common
law doctrines as specified in Paragraph 9 below by performing and billing a CBC
(CPT 85025) when a hematocrit (CPT 85013 and 85014) or a hemoglobin (CPT 85018)
was ordered by a physician, by submitting false and fraudulent claims for these
tests that LIFECHEM knew were not ordered by physicians, and further knew were
not lawfully billable under CPT 85025, and these tests were billed by and paid
to LIFECHEM;
<PAGE>

     V.   WHEREAS, the United States alleges that at various times from June 1,
1990 through November 1, 1999, LIFECHEM violated federal statutes and/or common
law doctrines as specified in Paragraph 9 below by performing and billing a CBC
with differential (CPT 85025) when a CBC without differential was ordered by a
physician, by submitting false and fraudulent claims for these tests that
LIFECHEM knew were not ordered by physicians, and further knew were not lawfully
billable under CPT 85025, and these tests were billed by and paid to LIFECHEM;

     W.   WHEREAS, the United States alleges that at various times from May,
1987 through November 1, 1999, LIFECHEM and MPD violated federal statutes and/or
common law doctrines as specified in Paragraph 9 below in connection with sales
and marketing practices that were designed to increase orders for laboratory
tests, including medically unnecessary laboratory tests, such practices
including compensation of the MPD sales force through commissions and bonuses
directly tied to increased laboratory testing, use of the Lifeline computer
system to assign tests and diagnosis codes to multiple patients without regard
to the patients' individual medical condition, use of permanent standing orders
for laboratory tests for patients without regard to the patients' individual
medical condition, misrepresentations to some physicians that NMC medical policy
supported use of certain panels and tests when it did not, misrepresentations to
some physicians that paneled tests were cheaper or more economical than
individual tests when they were not, and insertion of certain laboratory tests
and diagnosis codes into the Lifeline computer system without a physician's
order;

     X.   WHEREAS, the United States alleges that at various times from May,
1987 through November 1, 1999, LIFECHEM and MPD violated federal statutes and/or
common law doctrines as specified in Paragraph 9 below in connection with their
willful, knowing and deliberate payment of illegal remuneration to dialysis
facilities and their owners, officers, directors, employees, representatives, or
agents, in the form of lavish entertainment; hunting
<PAGE>

trips; payment for full time employees; grants; up-front rebate checks;
discounts and special pricing on products; free or low cost laboratory testing
for indigent patients, facility staff, and HMO patients; free or low cost
environmental and machine testing; profit sharing with medical directors
pursuant to contracts effective through December 31, 1991; composite rate tests
below fair market value; and computer hardware and software, all to obtain
unlawful referrals of laboratory business to LIFECHEM, and that LIFECHEM and MPD
submitted or caused to be submitted false and fraudulent claims for payment to
the United States for laboratory test business, including tests that LIFECHEM
and MPD knew were not reasonable or necessary in the diagnosis or treatment of
illness or injury, that were generated by illegal kickbacks, which laboratory
tests were billed by and paid to LIFECHEM;

     Y.   WHEREAS, the United States alleges that the practices described in
Preamble Paragraphs K through X above resulted in the submission of false or
fraudulent claims actionable under the False Claims Act, 31 U.S.C. (S)(S) 3729-
3733, to the Medicare, Railroad Retirement Medicare, TRICARE, FEHBP, the VA, and
the Medicaid programs of the Participating States;

     Z.   WHEREAS, the United States contends that it has certain administrative
claims  against LIFECHEM and MPD, and against NMC and FMCH as parents of
LIFECHEM and MPD, under the provisions for permissive exclusion from Medicare,
Medicaid, and other federal health care programs, 42 U.S.C. (S) 1320a-7(b), and
the provisions for civil monetary penalties, 42 U.S.C. (S) 1320a-7a, for the
conduct described in Preamble Paragraphs K through Y;

     AA.  WHEREAS, with the sole exception of the guilty pleas entered by
LIFECHEM and MPD in the Criminal Action, LIFECHEM, MPD, NMC and FMCH contend
that LIFECHEM and MPD's marketing, sales, pricing, paneling and billing
practices were appropriate and lawful and did not result in any violations of
federal or state law or common law
<PAGE>

doctrines; and further specifically deny and affirmatively contest the
allegations of the Relators in the Civil Action; and

     BB.  WHEREAS, to avoid the delay, expense, inconvenience and uncertainty of
protracted litigation of these claims, the Parties mutually desire to reach a
full and final compromise of claims that the United States has against LIFECHEM,
MPD, NMC and FMCH for the conduct described in Preamble Paragraphs K through Y
above, pursuant to Terms and Conditions set forth below:

     III. TERMS AND CONDITIONS
          --------------------

     NOW, THEREFORE, in reliance on the representations contained herein and in
consideration of the mutual promises, covenants, and obligations in this
Agreement, and for good and valuable consideration, receipt of which is hereby
acknowledged, the Parties agree as follows:

     1.   NMC and FMCH, collectively, shall pay to the United States and the
Participating States, collectively, the sum of one hundred twelve million one
hundred sixty thousand dollars ($112,160,000) (the "Settlement Amount"), and
this sum shall constitute a debt immediately due and owing to the United States
upon the later of the dates on which (a) this Agreement is fully executed by the
Parties, (b) the notice of dismissal described in Paragraph 18 of this
Agreement is filed and docketed by the Court, or (c) the Court accepts LIFECHEM
and MPD's guilty pleas and the sentences set forth in their respective Plea
Agreements described in Preamble Paragraphs C and D (the "First Payment Date").
NMC and FMCH shall pay the Settlement Amount to the United States according to
the schedule, terms and instructions contained in the Promissory Note executed
contemporaneous with this Agreement, attached as Exhibit A, and incorporated by
reference.  Within a reasonable amount of time after receipt of the first
payment from NMC and FMCH pursuant to the terms of the Promissory Note, the
United States shall pay to the Participating States, collectively, according to
written payment instructions from the
<PAGE>

Participating States, an amount of two million five hundred twenty seven
thousand one hundred thirty three dollars ($2,527,133) as the Participating
States' share of the Settlement Amount.

     2.   As an express condition of the Settlement Agreement, to secure NMC's
and FMCH's payment obligations under Paragraph 1 of this Agreement (and the
other civil Settlement Agreements and criminal Plea Agreements executed
contemporaneously), NMC and FMCH shall:

          a.   procure from the Bank of Nova Scotia and deliver or cause to be
delivered to the United States Attorney's Office for the District of
Massachusetts, on or before January 19, 2000, an amendment to the unconditional,
irrevocable Letter of Credit No. S020/43695/96 issued to the United States of
America on September 27, 1996 (the "Letter of Credit") to increase the amount of
the Letter of Credit to $189,634,446.   The amendment to the Letter of Credit
shall be in the form attached as Exhibit B.  Within 10 days of receipt by the
U.S. Attorney's Office of written confirmation from the transferring bank that a
quarterly payment, as described in Paragraphs 1.B. through 1.E of the Promissory
Note, or prepayment of such quarterly payments, has been made to the United
States, the United States shall provide written permission to the Bank of Nova
Scotia to reduce the amount available for drawing under Letter of Credit No.
S020/43695/96 by the amount of the principal payment received.  In the event
that the entire outstanding payment obligation secured by the Letter of Credit
is prepaid, then the United States shall provide written permission to reduce
the amount available for drawing to zero.  The United States shall return the
Letter of Credit for cancellation when all obligations secured by it are paid in
full or it is determined, by the United States, or pursuant to a final and non-
appealable order of a court of competent jurisdiction, that NMC and FMCH have
fulfilled all such payment obligations to the United States; and

          b.   on January 19, 2000, NMC and FMCH shall establish an escrow
account in an initial amount of $236,401,919 to be held by an independent third
party agreeable to the
<PAGE>

United States, and they shall increase the escrow amount each day in an amount
of $48,546 (through accrued interest and/or deposits), beginning on January 20,
2000 and continuing through April 15, 2000, when the escrow amount each day will
increase by an additional amount of $7,271 (through accrued interest and/or
deposits), for each quarterly payment due before the first payment is due on the
First Payment Date under the Promissory Note. On the First Payment Date all
funds in the escrow account shall be paid to the United States to satisfy the
payment obligation in Paragraph 1.A. of the Promissory Note. The terms and
conditions of this escrow account shall in no way limit NMC and FMCH's payment
obligations to the United States either pursuant to the Promissory Note or as
secured by the Letter of Credit.

     3.   NMC and FMCH are in default of this Agreement on the date of
occurrence of any of the following events ("Events of Default"):

          a.   NMC's and/or FMCH's failure to procure, deliver or maintain the
Letter of Credit;

          b.   NMC's and/or FMCH's failure to pay any amount provided for in the
Promissory Note within two days of when such payment is due and payable;

          c.   If prior to making the full payment of the amount due under
Paragraph 1, (i) NMC and/or FMCH commences any case, proceeding, or other action
(A) under any law relating to bankruptcy, insolvency, reorganization or relief
of debtors, seeking to have any order for relief of debtors, or seeking to
adjudicate NMC and/or FMCH as bankrupt or insolvent, or (B) seeking appointment
of a receiver, trustee, custodian or other similar official for NMC and/or FMCH
or for all or any substantial part of NMC's and/or FMCH's assets; or (ii) there
shall be commenced against NMC and/or FMCH any such case, proceeding or other
action referred to in clause (i) which results in the entry of an order for
relief and any such order remains undismissed, or undischarged or unbonded for a
period of thirty (30) days; or (iii) NMC and/or
<PAGE>

FMCH takes any action authorizing, or in furtherance of, or indicating its
consent to, approval of, or acquiescence in, any of the acts set forth above in
sub-Paragraph 3.c.(ii); or

          d.   NMC's and/or FMCH's failure to establish, maintain, or make the
required payments to the escrow account described in Paragraph 2.b.

     4.   If payments due under the Promissory Note are received late, but
within the two-day grace period provided in Paragraph 3.b., interest incurred
during such grace period will be assessed at two times the daily amount in
effect on the date the payment was due.

     5.   NMC and FMCH shall provide the United States written notice of an
Event of Default within two (2) business days of such event by overnight mail,
or facsimile followed by overnight delivery, to the United States Attorney's
Office, District of Massachusetts, One Courthouse Way, Suite 9200, Boston, MA
02210, Attention: Susan G. Winkler, Assistant U.S. Attorney (or to the attention
of such other person as may be designated in writing by the United States
Attorney's Office).

     6.   Immediately upon the occurrence of an Event of Default, without
further notice or presentment and demand by the United States:

          a.   The Settlement Amount plus accrued interest through the end of
the applicable quarter as set forth in Paragraph 1 of the Promissory Note (minus
any payments to date of principal and interest) shall become immediately due and
payable ("Settlement Default Amount"). Interest shall be calculated on the
Settlement Default Amount at the Prime Rate as published in the Wall Street
                                                                -----------
Journal on the Effective Date of the Promissory Note plus 5% from the date of
- -------
the Event of Default.

          b.   In addition, NMC and FMCH will pay the United States all
reasonable costs of collection and enforcement of the Settlement Default Amount,
including attorneys' fees and expenses, plus interest as described in Paragraph
6.a. The Settlement Default Amount, plus
<PAGE>

interest, described in Paragraph 6.a., together with the costs of collection and
enforcement described in this sub-paragraph, will be referred to as the "Default
Obligation."

     7.   Upon occurrence of an Event of Default, the United States may
exercise, at its sole option, one or more of the following rights:

          a.   The United States may draw the full amount available for drawing
under the Letter of Credit and retain all proceeds thereof.

          b.   The United States may enforce the terms of the Guarantee
Agreement between the United States of America, Fresenius Medical Care GMBH, a
German corporation and the predecessor of Fresenius Medical Care AG, W.R. Grace
& Co., a New York corporation, and National Medical Care, Inc., dated July 31,
1996, attached as Exhibit C.

          c.   The United States retains any and all other rights and remedies
it has or may have under law and equity.

          d.   No failure or delay on the part of the United States to exercise
any right or remedy shall operate as a waiver of the United States' rights. No
single or partial exercise by the United States of any right or remedy shall
operate as a waiver of the United States' rights.

     8.   In an Event of Default under Paragraph 3.c. above (Commencement of
Bankruptcy or Reorganization Proceeding):

          a.   NMC and FMCH agree not to contest or oppose any motion filed by
the United States seeking relief from or modification of the automatic stay of
11 U.S.C. (S) 362(a); not to seek relief under 11 U.S.C. (S) 105 to enjoin or
restrain the United States from recovering monies owed by NMC and FMCH arising
out of this Agreement or the attached Promissory Note, or from recovering monies
through presentment against the Letter of Credit. NMC and FMCH recognize that
this express waiver is in consideration for the settlement of claims by the
United States described in Preamble Paragraphs K through Y above, under the
terms and conditions contained in this Settlement Agreement.
<PAGE>

          b.   By expressly waiving the automatic stay provision, NMC and FMCH
agree not to oppose or interfere with any motion made in federal court
(including bankruptcy courts) by the United States to exclude LIFECHEM and MPD
from participation in the Title XVIII (Medicare), Title XIX (Medicaid) programs,
and other federal health care programs;

          c.   This Agreement shall be voidable at the sole option of the United
States;

          d.   If any term(s) of this Agreement are set aside for any reason,
including as a result of a preference action brought pursuant to 11 U.S.C. (S)
547, the United States, at its sole option and in its discretion, may rescind
all terms of this Agreement and seek recovery of the full amount of claims and
allegations identified herein and in the Civil Action, or, in the alternative,
enforce the remaining terms of this Agreement. In the event of rescission of
this Agreement, all Parties reserve all rights, claims, and defenses that are
available under law and equity as of the Effective Date of this Agreement; and

          e.   In addition to the rights enumerated in Paragraph 8.a. through
8.d. above, the United States and all other Parties shall retain all rights and
claims they have or may have under law and equity.

     9.   Subject to the exceptions and limitations in Paragraph 10 below, in
consideration of the obligations of LIFECHEM, MPD, NMC and FMCH set forth in
this Agreement, conditioned upon payment in full of the Settlement Amount,
subject to Paragraph 29 below (concerning bankruptcy proceedings commenced
within 91 days of any payment under this Agreement), and subject to the
acceptance by the United States District Court for the District of Massachusetts
of LIFECHEM and MPD's guilty pleas as described in Preamble Paragraphs C and D,
the United States, on behalf of itself, and its officers, agents, agencies, and
departments, will release and will be deemed to have released LIFECHEM, MPD,
their parents, including NMC and FMCH, and the subsidiaries of NMC and FMCH
listed on the attached Exhibit D (collectively, the parents and subsidiaries of
NMC and FMCH listed on Exhibit D will be
<PAGE>

referred to as the "NMC Companies," and the corporate entities listed on Exhibit
D comprise the only entities which constitute the "NMC Companies" within the
meaning of this Agreement), and the current directors, officers, employees, and
agents of the NMC Companies who were not employed by or in any way affiliated
with LIFECHEM, MPD, NMC, or NMC's parents, subsidiaries, divisions, or
affiliates at any time prior to September 30, 1996, from any civil or
administrative monetary claim (including recoupment claims) that the United
States has or may have under the False Claims Act, 31 U.S.C. (S)(S) 3729-3733;
the Program Fraud Civil Remedies Act, 31 U.S.C. (S)(S) 3801-3812; the Civil
Monetary Penalties Law, 42 U.S.C. (S) 1320a-7a; or common law claims for fraud,
payment by mistake of fact, breach of contract or unjust enrichment for the
conduct described in Preamble Paragraphs K through Y above with respect to
claims submitted or caused to be submitted to Medicare, Railroad Retirement
Medicare, TRICARE, FEHBP, the VA, and/or the Medicaid programs of the
Participating States.

     10.  Notwithstanding any term of this Agreement, the United States
specifically does not release LIFECHEM, MPD, the NMC Companies, or any
individual from any and all of the following:  (a) any potential criminal, civil
or administrative claims arising under Title 26, U.S. Code (Internal Revenue
Code); (b) any criminal liability; (c) any potential liability to the United
States (or any agencies thereof) for any conduct other than that identified in
Preamble Paragraphs K through Y above, including but not limited to any
allegations in the Civil Action not encompassed by Preamble Paragraphs K through
Y; (d) any entities not specifically included on the list of NMC Companies set
forth in Exhibit D, such omitted entities specifically including Spectra
Laboratories, Inc., SRC Holding Company, Inc. and their subsidiaries; (e) any
claims based upon such obligations as are created by this Agreement; (f) except
as explicitly stated in this Agreement, any administrative liability, including
mandatory exclusion from Federal health care programs; (g) any express or
implied warranty claims or other claims for defective or deficient products and
services provided by LIFECHEM or MPD, including quality of testing or
<PAGE>

product claims; (h) any claims for personal injury or property damage or for
other consequential damages arising from the conduct described in Paragraphs K
through Y above; (i) any claims based upon failure to deliver items or services;
(j) any civil or administrative claims against any individual who was an
officer, director, trustee, agent, employee, or was in any way affiliated with
LIFECHEM, MPD, NMC, or NMC's parents, subsidiaries, divisions, or affiliates at
any time prior to September 30, 1996; or (k) any civil or administrative claims
against any individual, including current directors, officers, employees and
agents who is criminally indicted or convicted of an offense, or who enters a
criminal plea related to the conduct alleged in Preamble Paragraphs K through Y
above.

     11.  In compromise and settlement of the rights of OIG-HHS to exclude
LIFECHEM and MPD pursuant to 42 U.S.C. (S) 1320a-7(a)(1), both LIFECHEM and MPD
agree to be permanently excluded under this statutory provision from
participation in Medicare, Medicaid, and all other federal health care programs
as defined in 42 U.S.C. (S) 1320a-7b(f).  Such exclusion will have national
effect and will also apply to all other Federal procurement and non-procurement
programs.  Federal health care programs will not reimburse LIFECHEM and/or MPD
or any one else for items or services, including administrative and management
services, furnished, ordered or prescribed by LIFECHEM and MPD in any capacity.
Both LIFECHEM and MPD waive any further notice of this exclusion, other than the
notice described in the last sentence of this paragraph, and agree not to
contest such exclusion either administratively or in any State or Federal court.
If LIFECHEM or MPD submits or causes claims to be submitted for services
provided while excluded, LIFECHEM and MPD are subject to the imposition of
additional civil monetary penalties and assessments.  LIFECHEM and MPD further
agree to hold the federal programs, and all the federal programs' beneficiaries
and/or sponsors, harmless from any financial responsibility for services
furnished, ordered or prescribed to such beneficiaries or sponsors after the
effective date of this exclusion.  LIFECHEM and MPD specifically waive
<PAGE>

their rights under any statute or regulation to payment from the Medicare,
Railroad Retirement Medicare, TRICARE, VA, FEHBP or Medicaid programs for
services rendered after the effective date of this exclusion. This exclusion
will be effective upon the date that LIFECHEM and MPD receive the notice of
exclusion from OIG-HHS.

     12.  FMCH, on behalf of itself and its parents, affiliates, subsidiaries,
and divisions, including but not limited to NMC, has entered into a Corporate
Integrity Agreement with HHS-OIG, which is incorporated into this Agreement by
reference.  FMCH will immediately upon execution of this Agreement implement its
obligations under the Corporate Integrity Agreement.

     13.  In consideration of the obligations of LIFECHEM, MPD, NMC and FMCH set
forth in this Agreement, conditioned upon payment in full of the Settlement
Amount, subject to Paragraph 29 below (concerning bankruptcy proceedings
commenced within 91 days of any payment under this Agreement), and conditioned
upon FMCH's entering into the Corporate Integrity Agreement, the OIG-HHS agrees
to release and refrain from instituting, directing, or maintaining any
administrative claim or any action seeking exclusion from the Medicare, Medicaid
or other Federal health care programs (as defined in 42 U.S.C. (S) 1320a-7b(f))
against the NMC Companies and the current directors, officers, employees, and
agents of the NMC Companies who were not employed by or in any way affiliated
with LIFECHEM, MPD, NMC, or any of NMC's parents, subsidiaries, divisions, or
affiliates at any time prior to September 30, 1996, under 42 U.S.C. (S) 1320a-7a
(Civil Monetary Penalties Law) or 42 U.S.C. (S) 1320a-7(b) (permissive
exclusion) for the conduct described in Preamble Paragraphs K through Y, except
as reserved in Paragraph 10 above and as reserved in this Paragraph. The OIG-HHS
expressly reserves all rights to comply with any statutory obligations to
exclude the NMC Companies from the Medicare, Medicaid, or other Federal health
care programs under 42 U.S.C. (S) 1320a-7(a)(mandatory exclusion). Nothing in
this Paragraph precludes the OIG-HHS from taking
<PAGE>

action against entities or individuals for conduct and practices for which civil
claims have been reserved in Paragraph 10 above.

     14.  In consideration of the obligations of LIFECHEM, MPD, NMC and FMCH set
forth in this Agreement, conditioned upon payment in full of the Settlement
Amount, and subject to Paragraph 29 below (concerning bankruptcy proceedings
commenced within 91 days of any payment under this Agreement), TSO agrees to
release and refrain from instituting, directing, or maintaining any
administrative claim or any action seeking exclusion from the TRICARE program
against the NMC Companies and the current directors, officers, employees, and
agents of the NMC Companies who were not employed by or in any way affiliated
with LIFECHEM, MPD, NMC or NMC's subsidiaries, divisions, and affiliates at any
time prior to September 30, 1996, under 32 C.F.R. (S) 199.9 for the conduct
described in Preamble Paragraphs K through Y, except as reserved in Paragraph 10
above and as reserved in this Paragraph.  The TSO expressly reserves all rights
to comply with any statutory obligations to exclude the NMC Companies from the
TRICARE program under 32 C.F.R. (S)(S) 199.9(f)(1)(i)(A), (f)(1)(i)(B),
(f)(1)(i)(D), and (f)(1)(iii).  Nothing in this Paragraph precludes the TSO from
taking action against entities or persons, or for conduct or practices, for
which civil claims have been reserved in Paragraph 10 above.

     15.  In consideration of the obligations of LIFECHEM, MPD, NMC and FMCH as
set forth in this Agreement, conditioned upon payment in full of the Settlement
Amount, and subject to Paragraph 29 below (concerning bankruptcy proceedings
commenced within 91 days of any payment under this Agreement), OPM agrees to
release and refrain from instituting, directing, or maintaining any
administrative claim or any action seeking exclusion from FEHBP against the NMC
Companies  and the current directors, officers, employees, and agents of the NMC
Companies who were not employed by or in any way affiliated with LIFECHEM, MPD,
NMC or NMC's subsidiaries, divisions, or affiliates at any time prior to
September 30, 1996, under
<PAGE>

5 U.S.C. (S) 8902a or 5 C.F.R. Part 970 for the conduct described in Preamble
Paragraphs K through Y including that in the Civil Action, except as reserved in
Paragraph 10 above, and except if the NMC Companies or any individuals are
excluded by the Office of Inspector General of HHS pursuant to 42 U.S.C. (S)
1320a-7(a). Nothing in this paragraph precludes OPM from taking action against
entities or persons, or for conduct and practice for which civil claims have
been reserved in Paragraph 10 above.

     16.  Jay A. Buford, William L. Schoff and Russell J. Davis each agree that
the settlement of the claims set forth in their Civil Action to the extent
encompassed by Preamble Paragraphs K through Y is fair, adequate and reasonable
under all the circumstances, pursuant to 31 U.S.C. (S) 3730(c)(2)(B).

     17.  The United States agrees to pay Jay A. Buford, William L. Schoff and
Russell L. Davis (the "Relators") collectively 16.5% of the federal share of the
Settlement Amount ($109,632,867) in a total principal amount of eighteen million
eighty-nine thousand four hundred twenty-three dollars ($18,089,423), plus 16.5%
of the interest paid by NMC and FMCH, if any.  To satisfy this obligation, the
United States will pay the Relators collectively 16.5% of the federal share of
the payments made by NMC and FMCH as they are received under the terms of the
Promissory Note, as more particularly set forth in Exhibit A to the Promissory
Note as those payments relate to this Agreement.  The first payment to Relators
will be made within 21 days after the First Payment Date, and subsequent
payments to the Relators will be made within 21 days after each additional
payment is received by the United States, by wire transfer to each of the
Relators in accordance with instructions to be provided by Relators' counsel.
Jay A. Buford, William L. Schoff, and Russell Davis, for themselves
individually, and for their respective heirs, successors, and assigns, will
release and will be deemed to have released and forever discharged the United
States from any claims pursuant to 31 U.S.C. (S) 3730, including 31 U.S.C.
(S)(S) 3730(b), (c), (d) and (d)(1), for a share of the proceeds of the Civil
Action, from any claims for a share of
<PAGE>

the Settlement Amount, and from any claims arising from the filing of their
Civil Action, and in full settlement of claims under this Agreement. This
Agreement does not resolve or in any manner affect any claims the United States
has or may have against the Relators Jay A. Buford, William L. Schoff, or
Russell L. Davis arising under Title 26, U.S. Code (Internal Revenue Code), or
any claims arising under this Agreement.

     18.  After this Agreement is fully executed, the United States and the
Relators will notify the Court that all pertinent Parties have stipulated that,
to the extent alleged in Paragraphs K through Y only, the Civil Action shall be
dismissed with prejudice effective upon receipt by the United States and the
Participating States of the payments described in Paragraph 1 above, pursuant to
and consistent with the terms of this Agreement.   The United States will notify
the Court that it declines to intervene in the remaining claims by the Relators
in the Civil Action, to the extent not alleged in Preamble Paragraphs K through
Y, and that the Relators intend to proceed on those claims.  The Parties agree
that the United States District Court for the District of Massachusetts shall
maintain jurisdiction of the unresolved claims in the Civil Action, all claims
in the Civil Action in the event that the Plea Agreements referenced in Preamble
Paragraphs C and D are not accepted by the Court, in an Event of Default, in the
event of disputes under this Agreement, and for purposes of resolving any
disputes regarding the Relators' claim against LIFECHEM, MPD, and the NMC
Companies for reasonable attorneys' fees, expenses and costs pursuant to 31
U.S.C. (S) 3730(d), arising from the filing of the Civil Action.

     19.  LIFECHEM, MPD, and the NMC Companies waive and will not assert any
defenses these entities may have to any criminal prosecution or administrative
action relating to the conduct described in Preamble Paragraphs K through Y,
which defenses may be based in whole or in part on a contention that, under the
Double Jeopardy Clause of the Fifth Amendment of the Constitution or Excessive
Fines Clause of the Eighth Amendment of the Constitution, this
<PAGE>

Settlement Agreement bars a remedy sought in such criminal prosecution or
administrative action. LIFECHEM, MPD, and the NMC Companies further agree that
nothing in this Agreement is punitive in purpose or effect.

     20.  Effective on the date of acceptance by the Court of the Plea
Agreements referenced in Preamble Paragraphs C and D, LIFECHEM, MPD, and the NMC
Companies release and will be deemed to have released the United States, its
agencies, employees, servants, and agents from any claims (including attorneys
fees, costs, and expenses of every kind and however denominated) which LIFECHEM,
MPD, and the NMC Companies have or may have against the United States, its
agencies, employees, servants, and agents, related to or arising from the United
States' civil, criminal and administrative investigation and prosecution of
LIFECHEM, MPD, NMC and FMCH.

     21.  The Settlement Amount that NMC and FMCH must pay pursuant to this
Agreement by electronic wire transfer pursuant to Paragraph 1 above will not be
decreased as a result of the denial of claims for payment now being withheld
from payment by any Medicare carrier or intermediary, Railroad Retirement
Medicare carrier, TRICARE, FEHBP, VA, or any Medicaid payer, related to the
conduct described in Preamble Paragraphs K through Y; and LIFECHEM, MPD and the
NMC Companies agree not to resubmit to any Medicare carrier or intermediary,
Railroad Retirement Medicare carrier, TRICARE, FEHBP, VA, or any Medicaid payer
any previously denied claims related to the conduct described in Preamble
Paragraphs K through Y, and agree not to appeal any such denials of claims.

     22.  The NMC Companies agree that all costs (as defined in the Federal
Acquisition Regulations ("FAR") (S) 31.205-47 and in Titles XVIII and XIX of the
Social Security Act, 42 U.S.C. (S)(S) 1395-1395ddd (1997) and 1396-1396v(1997),
and the regulations promulgated thereunder) incurred by or on behalf of
LIFECHEM, MPD, and the NMC Companies, and their divisions, subsidiaries and
affiliates, and their present and former officers, directors, employees,
<PAGE>

shareholders and agents in connection with:  (a) the matters covered by this
Agreement and the related Plea Agreements described in Preamble Paragraphs C and
D; (b) the Government's administrative, civil and criminal investigation and
prosecution of LIFECHEM, MPD, NMC, and FMCH; (c) these corporate entities'
investigation, defense, and corrective actions undertaken in response to the
Government's administrative, civil and criminal investigations, and  in
connection with the matters covered by this Agreement, the Plea Agreements, and
including the obligations undertaken pursuant to the Corporate Integrity
Agreement (including attorneys fees); (d) the negotiation and performance of
this Agreement, the Plea Agreements, and the Corporate Integrity Agreement; and
(e) the payments made to the United States provided for in this Agreement and
the Plea Agreements, and to Relators for attorney's fees and costs, are
unallowable costs on Government contracts and under Medicare, Railroad
Retirement Medicare, Medicaid, TRICARE, FEHBP, and the VA programs (hereafter,
"unallowable costs"). These unallowable costs will be separately estimated and
accounted for by LIFECHEM, MPD, and the NMC Companies and these entities will
not charge such unallowable costs directly or indirectly to any contracts with
the United States or any Medicaid program, or seek payment for such unallowable
costs through any cost report, cost statement, information statement or payment
request submitted by the NMC Companies or any of their divisions, subsidiaries
or affiliates to the Medicare, Railroad Retirement Medicare, Medicaid, TRICARE,
VA or FEHBP programs.

     LIFECHEM, MPD, and the NMC Companies further agree that within 270 days of
the effective date of this Agreement these entities will identify to applicable
Medicare, Railroad Retirement Medicare, and TRICARE fiscal intermediaries,
carriers and/or contractors, and Medicaid, VA and FEHBP fiscal agents, any
unallowable costs (as defined above) included in payments previously sought from
the United States, or any Medicaid Program, including, but not limited to,
payments sought in any cost reports, cost statements, information reports, or
payment requests already submitted by the NMC Companies or any of their
subsidiaries, affiliates, or
<PAGE>

divisions and will request, and agree, that such cost reports, cost statements,
information reports or payment requests, even if already settled, be adjusted to
account for the effect of the inclusion of the unallowable costs. LIFECHEM, MPD,
and the NMC Companies agree that the United States will be entitled to recoup
from the NMC Companies any overpayment as a result of the inclusion of such
unallowable costs on previously-submitted cost reports, information reports,
cost statements or requests for payment. Any payments due after the adjustments
have been made shall be paid to the United States pursuant to the direction of
the Department of Justice, and/or the affected agencies. The United States
reserves its rights to disagree with any calculations submitted by LIFECHEM,
MPD, the NMC Companies, or any of their subsidiaries, affiliates or divisions,
on the effect of inclusion of unallowable costs (as defined above) on the NMC
Companies or any of their subsidiaries, affiliates or divisions' cost reports,
cost statements or information reports. Nothing in this Agreement shall
constitute a waiver of the rights of the United States to examine or reexamine
the unallowable costs described above.

     23.  This Agreement is intended to be for the benefit of the Parties only,
and by this instrument the Parties do not release any claims against any other
person or entity except as specifically identified in Paragraph 9, 13, 14, 15,
and 17 above.

     24.  LIFECHEM, MPD and the NMC Companies agree that they will not seek
payment for any of the health care billings covered by this Agreement from any
health care beneficiaries or their parents, sponsors, estates, heirs, successors
or assigns.  LIFECHEM, MPD and the NMC Companies waive any causes of action
against these beneficiaries or their parents, sponsors, estates, heirs,
successors, or assigns based upon the claims for payment covered by this
Agreement.

     25.  The NMC Companies covenant to cooperate fully and truthfully with the
United States' civil investigation of individuals not specifically released in
this Agreement.  The NMC Companies will make reasonable efforts to facilitate
access to, and encourage the cooperation of,
<PAGE>

its directors, officers and employees for interviews and testimony, consistent
with the rights and privileges of such individuals, and will furnish to the
Untied States, upon reasonable request, all non-privileged documents and records
in its possession, custody or control.

     26.  Nothing in this Agreement constitutes an agreement by the United
States concerning the characterization of the amounts paid hereunder for
purposes of any proceeding under Title 26 of the Internal Revenue Code.

     27.  Except as provided in Paragraph 6.b., and except for Relators'
unresolved claim against LIFECHEM, MPD, and the NMC Companies for reasonable
attorneys' fees, expenses and costs pursuant to 31 U.S.C. (S) 3730(d), each
party to this Agreement will bear his or its own legal and other costs incurred
in connection with this matter, including by way of example only, all costs
incurred in the investigation and defense of this matter, the preparation and
performance of this Agreement, and all corrective actions taken in response to
the investigation and resolution of this matter.

     28.  NMC and FMCH expressly warrant that they have reviewed their financial
condition and that they currently are solvent on a consolidated basis within the
meaning of 11 U.S.C. Section 547(b)(3), and expect to remain solvent on a
consolidated basis following payment to the United States hereunder.  Further,
the Parties expressly warrant that, in evaluating whether to execute this
Agreement, the Parties (a) have intended that the mutual promises, covenants and
obligations set forth herein constitute a contemporaneous exchange for new value
given to LIFECHEM, MPD, NMC and FMCH within the meaning of 11 U.S.C. Section
547(c)(1), and (b) have concluded that these mutual promises, covenants, and
obligations do, in fact, constitute such a contemporaneous exchange.

     29.  In the event NMC or FMCH commences, or a thirty party commences,
within 91 days of any payment under of this Agreement, any case, proceeding, or
other action (i) under any law relating to bankruptcy, insolvency,
reorganization or relief of debtors, seeking to have any
<PAGE>

order for relief of NMC and/or FMCH's debts, or seeking to adjudicate NMC and/or
FMCH as bankrupt or insolvent, or (ii) seeking appointment of a receiver,
trustee, custodian or other similar official for NMC and/or FMCH or for all or
any substantial part of NMC and/or FMCH's assets, NMC and FMCH agree as follows:

          a.   NMC and FMCH's obligations under this Agreement may not be
avoided pursuant to 11 U.S.C. Section 547, and NMC and FMCH will not argue or
otherwise take the position in any such case, proceeding or action that: (i) NMC
and/or FMCH's obligations under this Agreement may be avoided under 11 U.S.C.
Section 547; (ii) NMC and FMCH were insolvent on a consolidated basis at the
time this Agreement was entered into, or became insolvent on a consolidated
basis as a result of the payment made to the United States hereunder; or (iii)
the mutual promises, covenants and obligations set forth in this Agreement do
not constitute a contemporaneous exchange for new value given to NMC and/or
FMCH.

          b.   In the event that NMC and/or FMCH's obligations hereunder are
avoided pursuant to 11 U.S.C. Section 547, the United States, at its sole
option, may rescind the releases in this Agreement, and bring any civil and/or
administrative claim, action or proceeding against LIFECHEM, MPD, NMC, and/or
FMCH for the claims that would otherwise be covered by the releases provided in
Paragraph 9, 13, 14 and 15 above. If the United States chooses to do so,
LIFECHEM, MPD, NMC and FMCH agree that (i) any such claims, actions or
proceedings brought by the United States (including any proceedings to exclude
LIFECHEM and/or MPD from participation in Medicare, Medicaid, or other federal
health care programs) are not subject to an "automatic stay" pursuant to 11
U.S.C. Section 362(a) as a result of the action, case or proceeding described in
the first clause of this Paragraph, and that LIFECHEM, MPD, NMC and FMCH will
not argue or otherwise contend that the United States' claims, actions or
proceedings are subject to an automatic stay; (ii) that LIFECHEM, MPD, NMC and
FMCH will not plead, argue or otherwise raise any defenses under the theories of
statute of limitations, laches, estoppel
<PAGE>

or similar theories, to any such civil or administrative claims, actions or
proceeding which are brought by the United States within 90 calendar days of
written notification to NMC and FMCH that the releases herein have been
rescinded pursuant to this Paragraph, except to the extent such defenses were
available on December 15, 1994; and (iii) the United States has a valid claim
against NMC and FMCH in the amount of the Default Obligation, and the United
States may pursue its claim, inter alia, in the case, action or proceeding
referenced in the first clause of this Paragraph, as well as in any other case,
action, or proceeding.

          c.   LIFECHEM, MPD, NMC and FMCH acknowledge that its agreements in
this Paragraph are provided in exchange for valuable consideration provided in
this Agreement.

     30.  LIFECHEM, MPD, NMC, FMCH, and each of the Relators represent that this
Agreement is freely and voluntarily entered into without any degree of duress or
compulsion whatsoever.

     31.  This Agreement is governed by the laws of the United States.  The
Parties agree that the exclusive jurisdiction and venue for any disputes arising
between and among the Parties under this Agreement will be the United States
District Court for the District of Massachusetts, except that disputes rising
under the Corporate Integrity Agreement shall be resolved exclusively upon the
dispute resolution provisions set forth in the Corporate Integrity Agreement.

     32.  The undersigned LIFECHEM, MPD, NMC and FMCH signatories represent and
warrant that they are authorized by their respective Board of Directors to
execute this Agreement.  The undersigned United States signatories represent
that they are signing this Agreement in their respective official capacities and
that they are authorized to execute this Agreement.

     33.  Except for the guilty pleas by LIFECHEM and MPD, and the
representations in Paragraphs 28 (regarding solvency), and Paragraph 29
(concerning bankruptcy proceedings commenced within 91 days of any payments
under this Agreement), the Parties agree that


<PAGE>

nothing in this Agreement constitutes an admission by any person or entity with
respect to any issue of law or fact.

     34.  This Agreement is effective on the date of signature of the last
signatory to the Agreement (the "Effective Date").

     35.  This Agreement shall be binding on all successors, transferees, heirs
and assigns.

     36.  This Agreement, together with attachments A through D, the Plea
Agreements described in Preamble Paragraphs C and D, and the Corporate Integrity
Agreement, constitute the complete agreement among the Parties with regard to
the conduct described in Preamble Paragraphs K through Y. This Agreement may not
be amended except by written consent of the Parties, except that only FMCH and
OIG-HHS must agree in writing to modification of the Corporate Integrity
Agreement.

     37.  This Agreement may be executed in counterparts, each of which shall
constitute an original and all of which shall constitute one and the same
Agreement.

                           UNITED STATES OF AMERICA



By:  /s/ Susan G. Winkler                               Dated: 1/19/00
     --------------------                                      --------
     SUSAN G. WINKLER
     Assistant United States Attorney
     District of Massachusetts



By:  /s/ Maya S. Guerra                                 Dated: 1-19-00
     -------------------                                       --------
     LAURENCE J. FREEDMAN
     MAYA S. GUERRA
     Civil Division
     United States Department of Justice


By:  /s/ Lewis Morris                                   Dated: 1/18/00
     ----------------                                          --------
     LEWIS MORRIS
     Assistant Inspector General

Office of Inspector General
U.S. Department of Health and Human Services
<PAGE>




By:  /s/ Frank D. Titus                           Dated:Jan. 18, 2000
     ---------------------------                        -------------
     FRANK D. TITUS
     Assistant Director for Insurance Programs
     U.S. Office of Personnel Management


By:  /s/ Robert D. Seaman                         Dated: 1-18-00
     ----------------------                             ---------
     ROBERT D. SEAMAN
     General Counsel
     TRICARE Support Office
     United States Department of Defense


By: /s/ Lewis Morris                              Dated:1/18/00
   ---------------------------                          ---------
     LEWIS MORRIS
     Assistant Inspector General, HHS-OIG
     For the Railroad Retirement Medicare Program
<PAGE>

                  LIFECHEM, INC., NMC MEDICAL PRODUCTS, INC.,
                   NATIONAL MEDICAL CARE, INC. and FRESENIUS
                          MEDICAL CARE HOLDINGS, INC.

By:  /s/  Ben. J. Lipps                                       January 18, 2000
     --------------------------------------------       Dated:----------------
     BEN J. LIPPS
     President, LIFECHEM, INC.

By:  /s/  Ben J. Lipps                                        January 18, 2000
     --------------------------------------------       Dated:----------------
     BEN J. LIPPS
     President, NMC Medical Products, Inc.

By:  /s/  Ben J. Lipps                                        January 18, 2000
     --------------------------------------------       Dated:----------------
     BEN J. LIPPS
     President, National Medical Care, Inc.

By:  /s/  Ben J. Lipps                                        January 18, 2000
     --------------------------------------------       Dated:----------------
     BEN J. LIPPS
     President, Fresenius Medical Care Holdings, Inc.

                                 Acknowledged:

By:  /s/  Jonathan Chiel                                      January 18, 2000
     --------------------------------------------       Dated:----------------
     JONATHAN CHIEL

By:  /s/  Breckinridge L. Wilcox                               1/18/00
     --------------------------------------------       Dated:----------------
     BRECKINRIDGE L. WILLCOX

By:  /s/  Alan E. Reider                                       1/18/00
     --------------------------------------------       Dated:----------------
     ALAN E. REIDER

By:  /s/  Harold Damelin                                       1/12/2000
     --------------------------------------------       Dated:----------------
     HAROLD DAMELIN

By:  /s/  Jeffrey Stone                                       January 18, 2000
     --------------------------------------------       Dated:----------------
     JEFFREY E. STONE



Attorneys for LIFECHEM, INC., NMC Medical Products, Inc.,

     National Medical Care, Inc., and Fresenius Medical Care Holdings, Inc.




<PAGE>

                   RELATORS JAY A. BUFORD, WILLIAM L. SCHOFF
                             and RUSSELL L. DAVIS


By:  /s/ Jay A. Buford                                         01/18/00
     --------------------------------------------       Dated:---------------
     JAY A. BUFORD

By:  /s/ William L. Schoff                                     01/18/00
     --------------------------------------------       Dated:---------------
     WILLIAM L. SCHOFF

By:  /s/ Russell J. Davis                                       1/18/00
     --------------------------------------------       Dated:---------------
     RUSSELL J. DAVIS


                                                        Acknowledged:

By:  /s/ John Rankin                                            01/18/2000
     --------------------------------------------       Dated:---------------
     JOHN RANKIN

     Counsel to Messrs. Buford, Schoff and Davis January 20, 2000.

<PAGE>

                                   EXHIBIT A

                                PROMISSORY NOTE
                                ---------------

AMOUNT: $371,549,253                                    Lexington, Massachusetts
                                                        January 19, 2000

     FOR VALUE RECEIVED the undersigned, Fresenius Medical Care Holdings, Inc.
and National Medical Care, Inc., which will be referred to as "Makers", hereby
jointly and severally promise to pay the principal sum of three hundred seventy
one million five hundred forty nine thousand two hundred fifty three dollars
($371,549,253.00) to the United States ("Payee"), in lawful money of the United
States according to the terms set forth below. This principal sum represents the
"Settlement Amount(s)," to the extent not already paid to Payees by Makers, as
defined in the four civil Settlement Agreements entered into between Makers and
others and the United States on January 19, 2000 (the "Effective Date").

          Said principal sum shall be paid as follows:

     1.   Makers agree jointly and severally to pay to the United States to
resolve civil liabilities, the sum of three hundred seventy one million five
hundred forty nine thousand two hundred fifty three dollars ($371,549,253.00),
and this sum shall constitute a debt immediately due and owing to the United
States on the "First Payment Date," which is the later of the dates on which (a)
the four civil Settlement Agreements are fully executed by the Parties, (b) all
notices of dismissal described in the civil Settlement Agreements are docketed
by the Court, or (c) the Court accepts LIFECHEM, INC.'s, NMC Medical Products,
Inc.'s, and NMC Homecare, Inc.'s guilty pleas and imposes the sentences set
forth in their respective Plea Agreements, on the following terms and
conditions, as further allocated among the four civil Settlement Agreements as
set forth on Attachment A:

          A.   On the First Payment Date, Makers shall pay to the United States
               the principal amount of $236,401,919, plus interest in an amount
               of $48,576 for each day from January 20, 2000 through April 15,
               2000, when the interest amount will increase by an additional
               amount of $7,271 for each day, for each quarterly payment due
               before this first payment is due;

          B.   On April 14, 2000, Makers shall pay the principal amount of
               $32,851,287 and the interest amount of $2,534,013 to the United
               States;

          C.   On July 14, 2000, Makers shall pay the principal amount of
               $33,467,249 and the interest amount of $1,918,051 to the United
               States;

          D.   On October 16, 2000, Makers shall pay the principal amount of
               $34,094,760 and the interest amount of $1,290,540 to the United
               States;

          E.   On January 15, 2001, Makers shall pay the principal amount of
               $34,734,037 and the interest amount of $651,263 to the United
               States.

The payments to the United States described above shall be electronically
transferred by noon

                                       1
<PAGE>

(Boston, Massachusetts time) on the date the payment is due pursuant to
instructions provided by the United States Attorney's Office for the District of
Massachusetts.

     2.   On January 19, 2000, Makers shall establish an escrow account in an
initial amount of $236,401,919, to be held by an independent third party
agreeable to the United States, and Makers shall increase the escrow amount each
day in an amount of $48,546 (through accrued interest and/or deposits),
beginning on January 20, 2000 and continuing through April 15, 2000, when Makers
shall increase the escrow amount by an additional amount each day of $7,271
(through accrued interest and/or deposits), for each quarterly payment due
before the first payment is due on the First Payment Date. On the First Payment
Date, all funds in the escrow account shall be paid to the United States to
satisfy the payment obligation in Paragraph 1.A. The terms and conditions of
this escrow account shall in no way limit the Makers' payment obligations to the
United States pursuant to this Promissory Note.

     3.   There will be no penalty for prepayment of the amounts in Paragraph 1.
All prepayments, if any, shall be applied first to accrued interest on the
Settlement Amount, with any remainder to be applied to unpaid principal. Makers
shall provide a written prepayment notice delivered to the United States
Attorney's Office for the District of Massachusetts one week prior to
prepayment.

     4.   Makers shall procure from the Bank of Nova Scotia and deliver or cause
to be delivered to the United States Attorney's Office for the District of
Massachusetts, on or before January 19, 2000, an amendment to the unconditional,
irrevocable Letter of Credit No. S020/43695/96 issued to the United States of
America on September 27, 1996 (the "Letter of Credit") to increase the amount of
the Letter of Credit to $189,634,446.00. Such amendment shall be in the form
attached as Attachment B. Within 10 days of receipt by the U.S. Attorney's
Office of written confirmation from the transferring bank that a quarterly
payment, as described in Paragraphs 1.B. through 1.E. above, or prepayment of
such quarterly payments, has been made to the United States, the United States
shall provide written permission to the Bank of Nova Scotia to reduce the amount
available for drawing under Letter of Credit No. S020/43695/96 by the amount of
the principal payment received. In the event that the entire outstanding payment
obligation secured by the Letter of Credit is prepaid, then the United States
shall provide written permission to reduce the amount available for drawing to
zero. The United States shall return this Letter of Credit for cancellation when
all obligations secured by it are paid in full or it is determined, by the
United States, or pursuant to a final and non-appealable order of a court of
competent jurisdiction, that Makers have fulfilled all such payment obligations.

     5.   Makers are in default of this Promissory Note on the date of
occurrence of any of the following events ("Events of Default"):

          a.   Makers' failure to procure, deliver or maintain the Letter
               of Credit;

          b.   Makers' failure to pay any amount provided for in this Promissory
               Note within two days of when such payment is due and payable;

          c.   If prior to making the full payment of the amount due under this
               Promissory Note:

               (i)  NMC and/or FMCH commences any case, proceeding, or other

                                       2
<PAGE>

                     action

                     (A) under any law relating to bankruptcy, insolvency,
                     reorganization or relief of debtors, seeking to have any
                     order for relief of debtors, or seeking to adjudicate NMC
                     and/or FMCH as bankrupt or insolvent, or

                     (B) seeking appointment of a receiver, trustee, custodian
                     or other similar official for NMC and/or FMCH or for all or
                     any substantial part of NMC's and/or FMCH's assets; or

               (ii)  there shall be commenced against NMC and/or FMCH any such
                     case, proceeding or other action referred to in clause (i)
                     which results in the entry of an order for relief and any
                     such order remains undismissed, or undischarged or unbonded
                     for a period of thirty (30) days; or

               (iii) NMC and/or FMCH takes any action authorizing, or in
                     furtherance of, or indicating its consent to, approval of,
                     or acquiescence in, any of the acts set forth above in sub-
                     Paragraph 5.c.(ii); or

          d.   Makers' failure to establish, maintain, or make the required
               payments to the escrow account described in Paragraph 2.

     6.   If payments due under Paragraph 1 are received late, but within the
two-day grace period provided in Paragraph 5.b., interest incurred during such
grace period will be assessed at two times the daily amount in effect on the
date the payment was due.

     7.   Makers shall provide the United States written notice of an Event of
Default within two (2) business days of such event by overnight mail, or
facsimile followed by overnight delivery, to the United States Attorney's
Office, District of Massachusetts, One Courthouse Way, Suite 9200, Boston, MA
02210.

     8.   Immediately upon the occurrence of an Event of Default, without
further notice or presentment and demand by the United States:

          a.             The Settlement Amount plus accrued interest through the
               end of the applicable quarter as set forth in Paragraph 1 (minus
               any payments to date of principal and accrued interest) shall
               become immediately due and payable ("Settlement Default Amount").
               Interest shall be calculated on the Settlement Default Amount at
               the Prime Rate as published in the Wall Street Journal on the
                                                  -------------------
               Effective Date of this Promissory Note plus 5% from the date of
               the Event of Default.

          a.             In addition, Makers will pay the United States all
               reasonable costs of collection and enforcement of this Promissory
               Note, including attorneys' fees and expenses, plus interest as
               described in Paragraph 8.a. The Settlement Default Amount, plus
               interest, described in

                                       3
<PAGE>

               Paragraph 8.a., together with the costs of collection and
               enforcement described in this sub-paragraph, will be referred to
               as the "Default Obligation."

     9.   Upon the occurrence of an Event of Default, the United States may
exercise, at its sole option, one or more of the following rights:

          a.             The United States may draw the full amount available
               for drawing under the Letter of Credit and retain all proceeds
               thereof.

          b.             The United States may enforce the terms of the
               Guarantee Agreement between the United States of America,
               Fresenius Medical Care GMBH, a German corporation and the
               predecessor of Fresenius Medical Care AG, W.R. Grace & Co., a New
               York corporation, and National Medical Care, Inc., dated July 31,
               1996.

          c.             The United States retains any and all other rights and
               remedies it has or may have under law and equity.

          d.             No failure or delay on the part of the United States to
               exercise any right or remedy shall operate as a waiver of the
               United States' rights. No single or partial exercise by the
               United States of any right or remedy shall operate as a waiver of
               the United States' rights.

     10.  This Promissory Note shall be binding upon Makers, their successors
and assigns, and shall inure to the benefit of the Payee, its successors and
assigns. This Promissory Note shall be governed and construed according to the
laws of the United States of America.

     11.  Makers acknowledge that they are entering into this agreement freely,
voluntarily and with no degree of compulsion whatsoever.

     12.  Makers shall provide to the United States Attorney for the District of
Massachusetts a certified copy of a resolution of their respective Board of
Directors affirming that each of their Board of Directors has authority to enter
into this Promissory Note, and has (1)

                                       4
<PAGE>

reviewed this Promissory Note, the attached Letter of Credit, and the four civil
Settlement Agreements entered into between Makers, the United States, and others
on January 19, 2000; (2) consulted with legal counsel in connection with the
matter; (3) voted to enter into this Promissory Note; and (4) voted to authorize
the corporate officer identified below to execute this Promissory Note and to
take such further steps as necessary to carry out the terms of this Promissory
Note.

     13.  When the indebtedness represented by this Note is satisfied, the
United States will return a copy of the note to Makers, through counsel, marked
"paid in full" and endorsed by an authorized representative of the United
States.

     IN WITNESS WHEREOF, Makers intending to be legally bound hereby and to so
bind their successors and assigns, have caused this Note to be executed by its
proper corporate officers and their corporate seals hereunto affixed, duly
attested, the day and year first above written.

                                        NATIONAL MEDICAL CARE, INC.

                                   By:  ____________________________
                                        BEN J. LIPPS
                                        Director and President
                                        National Medical Care, Inc.

Corporate Seal:

Corporate Acknowledgment:
Commonwealth of Massachusetts
Middlesex County

     On January 19, 2000, before me personally came Ben J. Lipps, to me known
who, being duly sworn, did depose and state that he resides in Boston,
Massachusetts; that he is a Director and the President of National Medical Care,
Inc., the corporation described in and which executed the above instrument; that
he knows the seal of said corporation; that the seal affixed to said instrument
is such corporate seal; that it was so affixed by order of the Board of
Directors of said corporation, and that he signed his name thereto by like
order.

                                             ____________________________
                                             Notary Public

                                       5
<PAGE>

                                   FRESENIUS MEDICAL CARE HOLDINGS, INC.

                              By:  ____________________________________
                                   Ben J. Lipps
                                   Director and President
                                   Fresenius Medical Care Holdings, Inc.

Corporate Seal:

Corporate Acknowledgment:
Commonwealth of Massachusetts
Middlesex County

     On January 19, 2000, before me personally came Ben J. Lipps, to me known
who, being duly sworn, did depose and state that he resides in Boston,
Massachusetts; that he is a Director and the President of Fresenius Medical Care
Holdings, Inc., the corporation described in and which executed the above
instrument; that he knows the seal of said corporation; that the seal affixed to
said instrument is such corporate seal; that it was so affixed by order of the
Board of Directors of said corporation, and that he signed his name thereto by
like order.

                                   ____________________________
                                   Notary Public

                                       6
<PAGE>

                                   EXHIBIT B

                                 AMENDMENT TO
                 IRREVOCABLE NONTRANSFERABLE LETTER OF CREDIT
                    THE BANK OF NOVA SCOTIA, ATLANTA AGENCY

Letter of Credit No.  Issue Date        Expiration Date     Maximum Amount
- --------------------------------------------------------------------------
S020/43695/96         January 19, 2000  September 15, 2001  $189,634,446.00

United States of America
U.S. Attorney for the District of Massachusetts
One Courthouse Way, Suite 9200
Boston, Massachusetts 02210

United States of America
Department of Justice
Civil Division, Commercial Litigation Branch
P.O. Box 261, Ben Franklin Station
Washington, DC 20044

Ladies and Gentlemen:

     At the request of NATIONAL MEDICAL CARE, INC., a Delaware corporation (the
"Account Party"), we hereby amend our Irrevocable Nontransferable Letter of
Credit No. S020/43695/96 (the "Letter of Credit") issued in your favor as
follows:

     1.   Effective January 19, 2000, the amount available for drawing under the
Letter of Credit is increased to a new maximum of $189,634,446.00 (One Hundred
Eighty Nine Million Six Hundred Thirty Four Thousand Four Hundred Forty Six
United States Dollars).

     2.   This amount is now available for payment upon presentation of your
sight draft(s) drawn on us in the form of Exhibit I attached hereto, together
with your draw certificate(s) in the form of Exhibit II attached hereto.

     3.   Presentation of the sight draft(s) and draw certificate(s) shall be
made at the address shown below:

          The Bank of Nova Scotia, Atlanta Agency
          600 Peachtree Street, N.E., Suite2700
          Atlanta, Georgia 30308
          Attn: Loan Operations Department
          Telephone: (404) 877-1500;
          Telecopy: (404) 888-8998

or at such other office located in the United States as may be designated by us.
A sight draft and draw certificate hereunder may be submitted via hand delivery
or overnight courier to the
<PAGE>

address above or by facsimile transmission to the address and telecopy number
shown above. If the sight draft and drawing certificate are submitted by
facsimile transmission, you must confirm our receipt of your sight draft and
drawing certificate to the telephone number shown above.

     4.   If the United States, through its U.S. Attorney's Office for the
District of Massachusetts, provides written notice of permission to reduce the
balance of this Letter of Credit to the Bank of Nova Scotia at the address
above, such reduction in the amount available for drawing under this Letter of
Credit shall be effective upon receipt.

     5.   This Letter of Credit shall now expire at 5:00 P.M. (Atlanta, Georgia
time) on the Expiration Date shown above.  Where demand for payment is made
prior to 12:00 Noon (Atlanta, Georgia time) in conformity with the requirements
hereof, then payment under the Letter of Credit shall be made by us by 12:00
Noon (Atlanta, Georgia time) on the next succeeding business day, or if notice
is received after such time then by 12:00 Noon (Atlanta, Georgia time) on the
second succeeding business day.

     The Letter of Credit and this amendment set forth in full the terms of our
undertaking, and such undertaking shall not in any way be modified or amended by
reference to any documents, instruments, or agreements referred to herein or in
which this Letter of Credit is referred to or to which this Letter of Credit
relates, and any such reference shall not be deemed to incorporate herein by
reference any document, instrument, or agreement.

     Multiple drawings are permitted.  This Letter of Credit is not
transferable.

     The Letter of Credit and this amendment are subject to the Uniform Customs
and Practice for Documentary Credits (1993 Revision), International Chamber of
Commerce Publication No. 500 (the "UCP") and, as to matters not covered by the
UCP, shall be governed by the laws of the State of Georgia.

                                   Very truly yours,
                                   THE BANK OF NOVA SCOTIA, ATLANTA AGENCY


                                   By___________________________
                                   Title:
<PAGE>

                                   EXHIBIT I
                                  SIGHT DRAFT


Date: ____________________________

     At sight, pay to the order of the UNITED STATES OF AMERICA by wire transfer
to:

     Bank Name:
     Routing Number:
     Account Number:
     Attn:

the amount of ___________________________ Dollars ($___________________) drawn
on THE BANK OF NOVA SCOTIA, ATLANTA AGENCY, as issuer of its Irrevocable
Nontransferable Letter of Credit No. S020/43695/96.

                         UNITED STATES OF AMERICA



                         By:________________________________
                         Title:

<PAGE>

                                  EXHIBIT II
DRAW CERTIFICATEDate: ______________

          The Bank of Nova Scotia, Atlanta Agency
          600 Peachtree Street, N.E., Suite2700
          Atlanta, Georgia 30308
          Attn: Letter of Credit Department

     Re:  Letter of Credit S020/43695/96

Ladies and Gentlemen:

     The undersigned duly authorized official of the Beneficiary hereby
certifies that the Beneficiary is entitled to draw under the Letter of Credit
because (one or more of the following blanks will be checked):

     __  (i)   an Event of Default has occurred under one or more of the four
               civil settlement agreements between the United States and
               Fresenius Medical Care Holdings, Inc. effective January 19, 2000;

     __  (ii)  a payment due under one or more of the criminal Plea Agreements
               between the United States and NMC Homecare, Inc., LIFECHEM, INC.,
               and NMC Medical Products, Inc. effective January 19, 2000 was not
               made when due;

     __  (iii) a payment due from National Medicare Care, Inc. and Fresenius
               Medical Care Holdings, Inc. to the United States of America under
               the Promissory Note effective January 19, 2000 was not made when
               due.

     Demand for payment under the above referenced Letter of Credit is hereby
made for the following amount:

          US $_____________________________________

Payment should be made in accordance with the instructions provided in the draft
which accompanies this certificate.

                              UNITED STATES OF AMERICA
                              Beneficiary

                              By: ________________________________
                                              Title:
<PAGE>

                                   EXHIBIT C
                                  (Guarantee)

The Guarantee Agreement dated as of July 31, 1996 among Fresenius Medical Care
GmbH, the predecessor to Fresenius Medical Care AG, National Medical Care,
Inc., W.R. Grace & Co. and the United States of America, is incorporated by
reference to the Registrant's Registration Statement on Form S-4 (Registration
No. 333-09497) dated August 2, 1996 and the exhibits thereto.
<PAGE>

                                   EXHIBIT D

<TABLE>
<CAPTION>
CORPORATION                                            STATE                        PARENT
<S>                                                    <C>                          <C>
Advanced Integrated Medical Services, Inc              NJ                           HNS-NJ
Amasi Medical Group, Inc.                              CA                           BMA-CA
Ambulatory Care Associates, Inc.                       DE                           HIC
American Home Therapies, Inc.                          MD                           HIC
American Homecare Equipment, Inc.                      VA                           NMC
Biotrax Connecticut, Inc.                              CT                           BIOTXINT
Bio-Trax International, Inc.                           DE                           NMCDIAG
BMA Home Dialysis Services, Inc.                       DE                           BMAMC
BMA Management Company, Inc                            DE                           NMC
BMA of Alabama, Inc.                                   DE                           BMAMC
BMA of Alameda County, Inc.                            DE                           BMAMC
BMA of Anacostia, Inc.                                 DE                           BMAMC
BMA of Aquadilla, Inc.                                 DE                           BMAMC
BMA of Arecibo, Inc.                                   DE                           BMAMC
BMA of Arizona, Inc.                                   DE                           BMAMC
BMA of Arkansas, Inc.                                  DE                           BMAMC
BMA of Bakersfield, Inc.                               DE                           BMAMC
BMA of Bayamon, Inc.                                   DE                           BMAMC
BMA of Blue Springs, Inc.                              DE                           BMAMC
BMA of Caguas, Inc.                                    DE                           BMAMC
BMA of California, Inc.                                DE                           BMAMC
BMA of Camarillo, Inc.                                 DE                           BMAMC
BMA of Capitol Hill, Inc.                              DE                           BMAMC
BMA of Carolina, Inc.                                  DE                           BMAMC
BMA of Carson, Inc.                                    DE                           BMAMC
BMA of Chula Vista, Inc.                               DE                           BMAMC
BMA of Clinton, Inc.                                   DE                           BMAMC
BMA of Colorado, Inc.                                  DE                           BMAMC
BMA of Columbia Heights, Inc.                          DE                           BMAMC
BMA of Connecticut, Inc.                               DE                           BMAMC
BMA of Corpus Christie, Inc.                           DE                           BMAMC
BMA of Delaware, Inc.                                  DE                           BMAMC
BMA of District of Columbia, Inc.                      DE                           BMAMC
BMA of Dover, Inc.                                     DE                           BMAMC
BMA of Dublin, Inc.                                    DE                           BMAMC
BMA of East Orange, Inc.                               DE                           BMAMC
BMA of Essex, Inc.                                     DE                           BMAMC
BMA of Eureka, Inc.                                    DE                           BMAMC
BMA of Fajardo, Inc.                                   DE                           BMAMC
BMA of Fayetteville, Inc.                              DE                           BMAMC
BMA of Florida, Inc.                                   DE                           BMAMC
BMA of Fremont, Inc.                                   DE                           BMAMC
BMA of Fresno, Inc.                                    DE                           BMAMC
BMA of Georgia, Inc.                                   DE                           BMAMC
BMA of Glendora, Inc.                                  DE                           BMAMC
BMA of Guayama, Inc.                                   DE                           BMAMC
BMA of Hayward, Inc.                                   DE                           BMAMC
BMA of Hillside, Inc.                                  DE                           BMAMC
</TABLE>
<PAGE>

<TABLE>
<S>                                                    <C>                          <C>
BMA of Hoboken, Inc.                                   DE                           BMAMC
BMA of Humacao, Inc.                                   DE                           BMAMC
BMA of Illinois, Inc.                                  DE                           BMAMC
BMA of Indiana, Inc.                                   DE                           BMAMC
BMA of Irvington, Inc.                                 DE                           BMAMC
BMA of Jersey City, Inc.                               DE                           BMAMC
BMA of Kansas, Inc.                                    DE                           BMAMC
BMA of Kentucky, Inc.                                  DE                           BMAMC
BMA of La Mesa, Inc.                                   DE                           BMAMC
BMA of Las Americas, Inc.                              DE                           BMAMC
BMA of Long Beach, Inc.                                DE                           BMAMC
BMA of Los Angeles, Inc.                               DE                           BMAMC
BMA of Los Gatos, Inc.                                 DE                           BMAMC
BMA of Louisiana, Inc.                                 DE                           BMAMC
BMA of Maine, Inc.                                     DE                           BMAMC
BMA of Manchester, Inc.                                DE                           BMAMC
BMA of Maryland, Inc.                                  DE                           BMAMC
BMA of Massachusetts, Inc.                             DE                           BMAMC
BMA of Mayaguez, Inc.                                  DE                           BMAMC
BMA of Michigan, Inc.                                  DE                           BMAMC
BMA of Minnesota, Inc.                                 DE                           BMAMC
BMA of Mission Hills, Inc.                             DE                           BMAMC
BMA of Mississippi, Inc.                               DE                           BMAMC
BMA of Missouri, Inc.                                  DE                           BMAMC
BMA of MLK, Inc.                                       DE                           BMAMC
BMA of National City, Inc.                             DE                           BMAMC
BMA of Nevada, Inc.                                    NV                           BMAMC
BMA of New Hampshire, Inc.                             DE                           BMAMC
BMA of New Jersey, Inc.                                DE                           BMAMC
BMA of New Mexico, Inc.                                DE                           BMAMC
BMA of New York, Inc.                                  DE                           BMAMC
BMA of North Carolina, Inc.                            DE                           BMAMC
BMA of North City, Inc.                                DE                           BMAMC
BMA of Northeast D.C., Inc.                            DE                           BMAMC
BMA of Oakland, Inc.                                   DE                           BMAMC
BMA of Ohio, Inc.                                      DE                           BMAMC
BMA of Oklahoma, Inc.                                  DE                           BMAMC
BMA of Pennsylvania, Inc.                              DE                           BMAMC
BMA of Pine Brook, Inc.                                DE                           BMAMC
BMA of Ponce, Inc.                                     DE                           BMAMC
BMA of Port Orange, Inc.                               DE                           BMAMC
BMA of Puerto Rico, Inc.                               DE                           BMAMC
BMA of Rhode Island, Inc.                              DE                           BMAMC
BMA of Rio Piedras, Inc.                               DE                           BMAMC
BMA of San Antonio, Inc.                               DE                           BMAMC
BMA of San German, Inc.                                DE                           BMAMC
BMA of San Juan, Inc.                                  DE                           BMAMC
BMA of South Carolina, Inc.                            DE                           BMAMC
BMA of South Queens, Inc.                              DE                           BMAMC
BMA of Southeast San Diego, Inc.                       DE                           BMAMC
BMA of Southeast Washington, Inc.                      DE                           BMAMC
</TABLE>
<PAGE>

BMA of Tarpon Springs,Inc. (changed name to            DE         BMAMC
Fresenius Management Services)
BMA of Tennessee, Inc.                                 DE         BMAMC
BMA of Texas, Inc.                                     DE         BMAMC
BMA of Torrance, Inc.                                  DE         BMAMC
BMA of Trenton, Inc.                                   DE         BMAMC
BMA of Ukiah, Inc.                                     DE         BMAMC
BMA of Union City, Inc.                                DE         BMAMC
BMA of Virginia, Inc.                                  DE         BMAMC
BMA of West Virginia, Inc.                             DE         BMAMC
BMA of Whittier, Inc.                                  DE         BMAMC
BMA of Wisconsin, Inc.                                 DE         BMAMC
BMA of Woonsocket, Inc.                                DE         BMAMC
Bradley Dialysis Clinic, Inc.                          TN         BMA-TN
Clinical Diagnostic Systems, Inc.                      FL         NMC-DIAL
Conejo Valley Dialysis, Inc.                           CA         BMAMC
Continue Care of Wyoming, Inc.                         WY         HNSQHC
Continue Care Pharmaceuticals, Inc.                    WY         HNSQHC
D Interim, Inc.                                        GA         HNS
Diagnostic Management Services, Inc.                   MA         PML,Inc.
Dialysis America Alabama, LLC                          DE         NMC
Dialysis America Georgia, LLC                          DE         FMCH
Dialysis Associates West, Inc.                         TN         BMA-TN
Dialysis Management Group, Inc.                        TN         BMA-TN
Dialysis Services, Inc.                                TX         BMAMC
Dialysis Supply Company                                DE         RRI(NY)
Erika de Reynosa S.A.                                  Mexico     ERIKA TX
Erika International Sales Corp.                        DE         NMCMPD
Erika Laboratories, Inc.                               DE         NMCMPD
Erika of Texas, Inc.                                   DE         FMCH
FMC A Acquisition Corp.                                DE         NMC
FMC Dialysis Services -  Oregon, LLC (f/k/a            OR         NMC
Willamette Valley Kidney Center, LLC)
FMC Dialysis Services Colorado LLC                     DE         BMAMC
Fresenius Canada Dialysis, Inc.                        DE         NMC
Fresenius de Mexico S.A.                               Mexico     FUSA
Fresenius Hemotechnology, Inc.
Fresenius Management Services LLC                      DE         BMAMC
Fresenius Management Services, Inc. (f/k/a BMA         DE         BMAMC
Tarpon Springs)
Fresenius Medical Care AG                              Germany
Fresenius Medical Care Canada, Inc.                    DE         FUSA
Fresenius Medical Care Pharmacy Services, Inc.         DE         FMCH
Fresenius Securities, Inc.                             CA         FMCH
Fresenius USA Home Dialysis, Inc.                      DE         FMCH
Fresenius USA Manufacturing, Inc.                      DE         FMCH
Fresenius USA Marketing, Inc.                          DE         FMCH
Fresenius USA of Puerto Rico, Inc.                     DE         FMCH
Fresenius USA Sales, Inc.                              MA         NMCMP
Fresenius USA, Inc.                                    MA         FMCH/FSEC
<PAGE>

Greater Southeast Community Center for Renal           DC         BMAMC
Disease, Inc.
Gulf Region Mobile Dialysis, Inc.                      DE         BMAMC
Gynesis Healthcare for Women of Florida, Inc.          FL         GHC
Gynesis Healthcare of Maryland, Inc.                   MD         GHC
Gynesis Healthcare of New Jersey, Inc.                 NJ         GHC
Gynesis Healthcare of New York, Inc.                   NY         GHC
Gynesis Healthcare of Oklahoma, Inc.                   OK         GHC
Gynesis Healthcare of Pennsylvania, Inc.               PA         GHC
Gynesis Healthcare of South Carolina, Inc.             SC         GHC
Gynesis Healthcare, Inc.                               DE         HIC
Gynesis Resources, Inc.                                DE         GHC
Haemo-Stat, Inc.                                       CA         NMC
Healthdyne Home Infusion Therapy, Inc.                 CA         HNS
Healthy Options for Personal Enrichment, Inc.          GA         HNS
HIC of Arizona, Inc.                                   AZ         HIC
HIC of California, Inc.                                CA         HIC
HIC of Colorado, Inc.                                  CO         HIC
HIC of Connecticut, Inc.                               CT         HIC
HIC of Florida, Inc.                                   FL         HIC
HIC of Georgia, Inc.                                   GA         HIC
HIC of Illinois, Inc.                                  IL         HIC
HIC of Kansas, Inc.                                    KS         HIC
HIC of Las Vegas, Inc.                                 NV         HIC
HIC of Louisiana, Inc.                                 LA         HIC
HIC of Maryland, Inc.                                  MD         HIC
HIC of Massachusetts, Inc.                             MA         HIC
HIC of Michigan, Inc.                                  MI         HIC
HIC of Missouri, Inc.                                  MO         HIC
HIC of New Jersey, Inc.                                NJ         HIC
HIC of New York, Inc.                                  NY         HIC
HIC of Northern Ohio, Inc.                             OH         HIC
HIC of Ohio, Inc.                                      OH         HIC
HIC of Pennsylvania, Inc.                              PA         HIC
HIC of Rhode Island, Inc.                              RI         HIC
HIC of Tampa, Inc.                                     FL         HIC
HIC of Virginia, Inc.                                  VA         HIC
HNS Accucare, Inc.                                     GA         HNS
HNS Integrated Care Centers, Inc.                      GA         HNS
HNS Medical Technology Services, Inc.                  GA         HNS
HNS Michigan, Inc.                                     GA         HNS
HNS New York, Inc.                                     NY         HNS
HNS Quality Home Care, Inc.                            GA         HNS
HNS UP Home Care, Inc.                                 GA         HNS
Home Dialysis Care, Inc.                               TX         HIC
Home Intensive Care, Inc.                              DE         NMC
Home Nutritional Services, Inc.                        NJ         NMCHC
Home Nutritional Services,Inc.                         CA         HNS(NJ)
Home Pharmacy Care of Michigan, Inc.                   MI         HIC
Homestead Artificial Kidney Center, Inc.               FL         BMA-FL
I.V. Solutions, LTD (a LLC)                            TX         HNS
Infusions Innovations of Jacksonville, Inc.            FL         HIC
<PAGE>

<TABLE>
<S>                                                    <C>      <C>
Infusions Innovations of Tampa, Inc.                   FL       HIC
Interamerican Acute Dialysis Services, Inc.            FL       BMA-FL
International Medical Care, Inc.                       DE       BMAMC
KDNY, Inc.                                             DE       HIC
Kentucky Indiana Nephrology, Inc.                      KY       QCInc.
Kidney Disease and Hypertension Center, Ltd.           AZ       BMA-AZ
LaFollette Dialysis Center,                            TN       BMA-TN
LC Laboratory Services, Inc. (dissolved)               DE       LIFECHEM
LC Laboratory Services, LLC                            DE       LCM
Life Assist Medical Products Corp.                     PR       FMCH
Lifechem, Inc.                                         DE       NMC
Lifeline Medical Supplies, Inc.                        FL       HIC
Lifeline Medical Systems, Inc.                         CA       HIC
Lifeline Medical Systems, Inc.                         FL       HIC
Medical Supply Company, Inc.                           VA       SECURITY
Medi-Sure Testing, Inc.                                VA       HIC
Med-X-Press, Inc.                                      DE       NMCMPD
Metro Dialysis Center - Kirkwood, Inc.                 MO       MDC-NO
Metro Dialysis Center - Normandy, Inc.                 MO       MDC-NO
Metro Dialysis Center-North, Inc.                      MO       BMA-MO
National Medical Care Canada, Inc.                     DE       IMC
National Medical Care Home Care Service Agency, Inc.   NY       NMCHC
National Medical Care of Taiwan, Inc.                  DE       IMC
National Medical Care, Inc.                            DE       FMCH
Neomedica, Inc.                                        DE       NMC
Nephrology Applications of Mobile, Inc.                AL       BMA-AL
NMC Asia-Pacific, Inc. (f/k/a NMC Dialysis Services
Taiwan, Inc.)                                          DE       IMC
NMC China, Inc.                                        DE       IMC
NMC Diabetic Foot Care Centers Orthotics, Inc.         DE       BMAMC
NMC Diabetic Foot Care, Inc.                           DE       BMAMC
NMC Diagnostic Services, Inc.                          DE       NMCDIAL
NMC Dialysis Service (Romania), Inc                    DE       IMC
NMC Dialysis Services, Inc.                            DE       BMAMC
NMC Funding Corporation                                DE       NMC
NMC Homecare of Michigan, Inc.                         DE       NMCHC
NMC International Inc.                                 DE       IMC
NMC Latin America, Inc.                                FL       IMC
NMC Management Services, Inc.                          DE       NMC
NMC Medical Products, Inc.                             DE       BMAMC
NMC Medical Services, Inc.                             PA       PII-MA
NMC Services (Romania), Inc.                           DE       IMC
NMC Services, Inc.                                     DE       NMC
NMC Ventures, Inc.                                     DE       NMCHC
Norlab, Inc.                                           MA       PMLInc.
Northern Suburban Dialysis                             MA       BMAMC
North Knoxville Dialysis Center, Inc.                  TN       BMA-TN
Park Diagnostic Imaging Center, Inc.                   FL       PII-FL
Park Imaging, Inc.                                     MA       PMLInc.
Park Imaging, Inc.                                     FL       PII-MA
Park Portable X-Ray, Inc.                              MA       PII-MA
</TABLE>

<PAGE>

<TABLE>
<S>                                                    <C>     <C>
PD Solutions of Arizona, Inc.                          AZ      PDSolns
PD Solutions of Georgia, Inc.                          GA      PDSolns
PD Solutions of Illinois, Inc.                         IL      PDSolns
PD Solutions of Louisiana,Inc.                         LA      PDSolns
PD Solutions of Maryland, Inc.                         MD      PDSolns
PD Solutions of Michigan, Inc.                         MI      PDSolns
PD Solutions of Missouri, Inc.                         MO      PDSolns
PD Solutions of Nevada, Inc.                           NV      PDSolns
PD Solutions of New Jersey, Inc.                       NJ      PDSolns
PD Solutions of New York, Inc.                         NY      PDSolns
PD Solutions of Ohio, Inc.                             OH      PDSolns
PD Solutions of Pennsylvania, Inc.                     PA      PDSolns
PD Solutions of Texas, Inc.                            TX      PDSolns
PD Solutions of Virginia, Inc.                         VA      PDSolns
PD Solutions, Inc.                                     DE      HIC
Personal Care Health Services, Inc.                    DE      NMCHC
Phoenix Consulting Services, Inc.                      FL      HIC
PML, Inc.                                              MA      NMCDIAG
Preferred Homecare of Florida, Inc.                    FL      NMCHC
Preferred Homecare of New Jersey, Inc.                 NJ      NMCHC
Preferred Pharmacy Services, Inc.                      FL      HIC
Prime Medical, Inc.                                    MA      NMC
QCDC of Baltimore, Inc.                                MD      HIC
QCDC of Creve Coeur, Inc.                              MO      QCDC
QCDC of Dallas, Inc.                                   TX      QCDC
QCDC of Greensburg, Inc.                               LA      QCDC
QCDC of Hammond, Inc.                                  DE      QCDC
QCDC of Houston, Inc.                                  TX      QCDC
QCDC of Las Vegas, Inc.                                NV      KDNY
QCDC of Margate, Inc.                                  FL      QCDC
QCDC of Mt. Vernon, Inc.                               VA      QCDC
QCDC of New Orleans, Inc.                              LA      QCDC
QCDC of North County, Inc.                             MO      QCDC
QCDC of Patapsco, Inc.                                 MD      QCDC
QCDC of San Antonio, Inc.                              TX      QCDC
QCDC of Southern Maryland, Inc.                        MD      QCDC
QCDC of St. Augustine, Inc.                            FL      QCDC
QCDC of St. Claire Shores, Inc.                        MI      QCDC
QCDC of St. Louis, Inc.                                MO      QCDC
QCDC of University City, Inc.                          MO      QCDC
QCDC of Vega Baja, Inc.                                PR      QCDC80%/CSV20%
QCDC of Vista, Inc.                                    CA      QCDC
QCI Holdings, Inc.                                     DE      NMC
QCI Limited Liability Company                          CO      QCInc.(97%)/QCIHold(3%)
QualiCenters Albany, Ltd.                              CO      QCInc.(99%)/QCILLC(1%)
QualiCenters Bend, LLC                                 CO      QCInc.(99%)/QCILLC(1%)
QualiCenters Coos Bay, Ltd.                            CO      QCInc.(70%)/QCIHold(30%)
QualiCenters Eugene-Springfield Ltd.                   CO      QCInc.(51%)/NMC(49%)
QualiCenters Inland Northwest LLC                      CO      QCInc.(70%)/NMC(30%)
QualiCenters Louisville LLC                            CO      QCInc.(80%)/NMC(20%)
QualiCenters Pueblo, LLC                               CO      QCInc.(70%)/QCIHold(30%)
QualiCenters Salem, LLC                                CO      QCInc.(60%)/NMC(40%)
</TABLE>
<PAGE>

<TABLE>
<S>                                                    <C>     <C>
QualiCenters Sioux City LLC                            CO      QCInc.(51%)/NMC(49%)
QualiCenters, Inc.                                     CO      QCIHold
QualiServ, Ltd.                                        CO      QCInc.(99%)/QCILLC(1%)
Quality Care Dialysis Centers, Inc.                    FL      KDNY
Renal Integrated Health Service Network LLC            AZ      BMA-AZ/50%
Renal Research Institute of Michigan, Inc.             DE      RRI(NY)
Renal Research Institute, LLC                          NY      NMC/80%
Renal Scientific Service of Texas, Inc.                DE      NMC
Renal Scientific Service, Inc.                         DE      NMC
Renal Supply (Tenn) Corp.                              NJ      BMAMC
Retaw, Inc.                                            FL      HIC
Rockwood Dialysis Center, Inc.                         VA      SECURITY
S.A.K.D.C., Inc.                                       TX      BMA-TX
San Diego Dialysis Services, Inc.                      DE      BMAMC
Santa Barbara Community Dialysis Center, Inc.          CA      BMAMC
Security Health Services, Inc.                         NV      BMA-VA
Sherlof, Inc.                                          SC      FUSA
Spectra East, Inc.                                     DE      SRC
Spectra Renal Research, LLC                            DE      NMC100%
St. Louis Regional Dialysis Center, Inc.               MO      BMA-MO
Tappahanock Dialysis Ctr., Inc.                        VA      SECURITY
Target Health Care, L.L.C.                             NY      NMCMgmt/50%
The Medical Accountability Group, Inc.                 TX      NMCMPD
U.S. Renal, LLC                                        DE      RHC 100%
U.S. Vascular Access Centers Of Texas, LLC             TX      USVASLLC
U.S. Vascular Access Centers, LLC                      DE      RHC
UKC-North, Inc.                                        TX      QCDC
United Dialysis Corporation                            CA      BMA-CA
University Kidney Center, Inc.                         TX      QCDC
US Renal-Texas, Inc.                                   TX      RHC
US Vascular Access Centers, Inc                        DE      RHC
VMS, Ltd.                                              AZ      BMA-AZ
Warrenton Dialysis Facility, Inc.                      VA      SECURITY
West End Dialysis Center, Inc.                         VA      SECURITY
Zenex Capital Corp.                                    FL      HIC
</TABLE>

"BMA" means "Bio-Medical Applications" in all instances.

"HIC" means "Home Intensive Care" in all instances.

<PAGE>

                                                                    EXHIBIT 10.3

                       SETTLEMENT AGREEMENT AND RELEASE
                       --------------------------------

                                  I. PARTIES
                                     -------

     This Settlement Agreement ("Agreement") is entered into by and among:

     A.  The United States of America, acting through the United States
Department of Justice and the United States Attorney's Offices for the Districts
of Massachusetts and the Southern District of Florida("DOJ") and on behalf of
(1)the Department of Health and Human Services ("HHS") through its Office of
Inspector General ("OIG-HHS") (2) the United States Department of Defense
through its TRICARE Support Office ("TSO") (formerly the Office of Civilian
Health and Medical Program of the Uniformed Services ("OCHAMPUS")), a field
activity of the Office of the Secretary of Defense, through counsel, (3) the
Office of Personnel Management ("OPM"), acting through the Director of Programs,
and (4) the United States Department of Veteran Affairs ("VA"), through counsel
(collectively the "United States");

     B.  Fresenius Medical Care Holdings, Inc. (d/b/a Fresenius Medical Care
North America) ("FMCH"), NMC Homecare, Inc., formerly known as National Medical
Care Home Care Division, Inc. ("NMC Homecare"), and National Medical Care, Inc.
("NMC"); and

     C.  Ven-A-Care of the Florida Keys, Inc., of Key West, Florida, by and
through its principal directors and officers Zachary T. Bentley, Luis E. Cobo,
and T. Mark Jones,
<PAGE>

(collectively "Ven-A-Care"), and Dana R. Austin ("Austin") (collectively the
"Relator" or the "Relators").

     Collectively all of the above will be referred to as "the Parties."

                                 II.  PREAMBLE
                                      --------

     A.  WHEREAS, at all relevant times, NMC was in the business of providing
dialysis and related services to patients with End-Stage Renal Disease ("ESRD")
throughout the United States. Medicare coverage was available to certain persons
without regard to their age, who had ESRD, an irreversible and permanent
impairment of kidney function requiring dialysis or kidney transplantation to
sustain life. NMC, through NMC Homecare, provided, among other services,
infusion therapies to patients of dialysis facilities owned or operated by NMC
(hereafter "BMAs") and patients of independent dialysis facilities not owned or
operated by NMC (hereafter "non BMAs"). Among the infusion therapies provided
were parenteral and enteral nutrition ("PEN"), including: (i) intradialytic
parenteral nutrition ("IDPN"), a form of parenteral nutrition administered to
dialysis patients during their hemodialysis sessions, i.e., typically three
times per week as part of the dialysis process without the need for insertion of
an additional catheter; and (ii) intraperitoneal parenteral nutrition ("IPN"), a
form of parenteral nutrition administered to patients during peritoneal
dialysis. IDPN and IPN will be referred to collectively herein as IDPN.
<PAGE>

     B.  WHEREAS, the United States contends that NMC and NMC Homecare submitted
or caused to be submitted claims for payment for IDPN solutions, equipment and
supplies to:

          (1) the Medicare Program ("Medicare"), Title XVIII of the Social
Security Act, 42 U.S.C. (S)(S) 1395-1395ddd (1997), which is administered by
HHS;

          (2) the TRICARE Program (also known as the Civilian Health and Medical
Program of the Uniformed Services ("CHAMPUS")), 10 U.S.C. (S)(S) 1071-1106,
which is administered by the Department of Defense through TSO;

          (3) the Federal Employees Health Benefits Program ("FEHBP"), 5 U.S.C.
(S)(S) 8901-8914, which is administered by OPM;

          (4) the VA Program, 38 U.S.C. (S)(S) 1701-1743, which is administered
by the VA;

          (5) the Railroad Retirement Medicare Program ("Railroad Medicare"),
established under the Railroad Retirement Act of 1974, 45 U.S.C. (S)(S) 231-
231v, which is paid from the Medicare Trust Fund and administered by the United
States Railroad Retirement Board ("RRB"); and

          (6) the Medicaid programs, 42 U.S.C. (S)(S) 1396-1396v (1997), of all
50 States and of the District of Columbia ("the Participating States") and of
the Territory of Puerto Rico ("the Participating Territory").

     C.  WHEREAS, the United States alleges that:

          (1) Medicare (and Railroad Medicare) covered IDPN under certain
conditions as part of Medicare's PEN program under the prosthetic device benefit
of the Social Security Act by virtue of
<PAGE>

and pursuant to a 1984 National Coverage Determination by HCFA, known as Section
65-10;

          (2) IDPN was a covered service only if the patient suffered from a
severe pathology of the alimentary tract which did not allow absorption of
sufficient nutrients to maintain weight and strength commensurate with the
patient's general condition;

          (3) for IDPN to be a covered service, Medicare required that a
physician order or prescribe the IDPN in writing and that the claim be supported
by sufficient medical documentation to permit an independent conclusion that the
requirements of Medicare's prosthetic device benefit were met;

          (4) Coverage of IDPN had to be approved on an individual case-by-case
basis initially and at periodic intervals by the designated Medicare carrier's
medical consultant or specially trained staff relying on such medical or other
documentation as the carrier may require;

          (5) Medicare did not provide coverage for IDPN prescribed by a
physician to treat malnutrition unless such malnutrition resulted from a severe
and permanent pathology of the alimentary tract satisfying the standards of the
Medicare prosthetic device benefit. Medicare also did not permit coverage if
IDPN was a nutritional "supplement;"

          (6) if these coverage criteria were met, then the related supplies and
equipment to administer the parenteral nutrition solutions were also covered so
long as they were reasonable and medically necessary;
<PAGE>

          (7) NMC Homecare usually submitted a claim for reimbursement to the
designated Medicare carrier each month for each Medicare beneficiary on IDPN and
on the claim NMC Homecare sought separate reimbursement for the IDPN solutions,
and for some but not necessarily all times in the period May, 1988 through
December 31, 1998, also sought reimbursement for: (a) rental of a pole from
which to hang the bag containing the solution; (b) rental of an infusion pump;
and (c) an administration kit, which was to cover the disposable supplies used
to administer IDPN; and

          (8) NMC Homecare provided IDPN to patients both in BMAs and in non
BMAs.

     D.  WHEREAS, the United States alleges that when Medicare (or Railroad
Medicare) covered IDPN claims for ESRD patients, Medicare in general paid 80% of
the Medicare allowed amount on a given patient. Where a patient was also
entitled to secondary coverage under FEHBP or the Medicaid programs, those
programs typically paid amounts in addition to the amounts paid by Medicare.

     E.  WHEREAS, the United States alleges that for ESRD patients covered by
CHAMPUS using the Medicare coverage criteria for IDPN, CHAMPUS typically paid
80% of the CHAMPUS allowed amount for IDPN, and for ESRD patients covered by the
VA, the VA typically paid the VA allowed amount for IDPN.

     F.  WHEREAS, NMC Homecare has entered into an agreement (the "Homecare Plea
Agreement") to plead guilty on or before January 19, 2000, or such other date as
may be determined by the Court,
<PAGE>

to Count One of an Information in United States of America v. NMC Homecare,
                                  -----------------------------------------
Inc., LIFECHEM, INC., and NMC Medical Products Division, Inc., Criminal Action
- -------------------------------------------------------------
No. [to be assigned] (District of Massachusetts) (the "Criminal Action"). That
Count alleges a violation of Title 18, United States Code, Section 371, namely a
conspiracy to defraud the United States by impeding, impairing, obstructing and
defeating the lawful governmental function of various departments and agencies
of the United States in the execution and administration of various federal
health care and health insurance programs, including Medicare's PEN benefit
program.

     G.  WHEREAS, the United States contends that it has certain civil claims
against NMC Homecare and NMC, and against FMCH as parent, for violating the
federal statutes and/or common law doctrines specified in Paragraph 11 below, in
connection with the following conduct with respect to their IDPN program for
dates of service beginning as early as May, 1988 and continuing through December
31, 1998 (hereinafter referred to as the "Covered Conduct").

     (1) For dates of service beginning as early as May, 1988, NMC Homecare
submitted claims for IDPN under Medicare. Of these submitted claims, and varying
in proportion by time period, some for dates of service through December 31,
1998 were paid for by Medicare through its designated carrier(s) (the "Paid
Claims"), and some were denied and not paid by Medicare through such carrier(s).
<PAGE>

     (2) A substantial portion of these submitted claims contained or were based
on false, fraudulent, and misleading statements, and/or material omissions,
relating to the patient's medical condition and history, eligibility for
coverage by Medicare and other federal and state payers, appropriate billing
codes, place of service designations, and charges. A substantial portion of the
patients on whose behalf these claims were submitted did not, in fact, meet
Medicare or other applicable coverage or billing criteria for IDPN.

     (3) NMC Homecare typically pursued administrative appeals of initial claim
denials at the carrier, the Office of Hearings and Appeals of the Social
Security Administration ("OHA"), and/or the Departmental Appeals Board of HHS
("Appeals Board or Council"). In connection with those appeals, NMC Homecare
made false, fictitious and fraudulent statements, and/or material omissions both
in the claim forms and in supporting documents, forms and otherwise. On many
occasions, NMC Homecare was successful in its appeal and was paid for the claim.
On many other occasions NMC Homecare withdrew claims from appeal because it had
concluded the patient did not meet Medicare coverage criteria. When it did so,
however, NMC Homecare failed to repay to Medicare or other federal or state
payers funds it had received relating to that patient, on other earlier IDPN
claims which had been paid.

     (4) For IDPN dates of service beginning as early as May 1988 and continuing
through December 31, 1999, NMC has performed IDPN services and provided supplies
and equipment to Medicare
<PAGE>

beneficiaries and has claims for such services, supplies and equipment, for
which it has not been paid by HCFA ("the Unpaid Claims").

     (5)  The United States contends that a substantial portion of the Paid
Claims and the Unpaid Claims contain false or fraudulent statements and/or
material omissions. The United States further contends that a substantial
portion of the patients at issue in those claims do not in fact meet the
Medicare coverage and billing criteria for IDPN.

     (6)  For dates of service beginning as early as May, 1988 and continuing
through December 31, 1998, NMC Homecare submitted or caused to be submitted IDPN
claims to other federal and state payers (besides Medicare). The United States
contends that a substantial portion of those claims contained false or
fraudulent statements. The United States further contends that a substantial
portion of the patients at issue did not in fact qualify for IDPN coverage under
the conditions and criteria required under those respective programs.

     (7)  In addition, from at least May, 1988 through approximately July, 1992,
NMC Homecare submitted to Medicare and other federal and state payers, claim
forms that were false or fraudulent because they: (a) billed for 30 or 31
administration kits per month for each IDPN patient on service despite the fact
that NMC Homecare only used at most 12 to 13 administration kits for each IDPN
patient on service throughout the month, and used even fewer kits for patients
who were on service only part of the month; and (b) billed using HCPCS codes
which were inapplicable
<PAGE>

to the kits supplied by NMC Homecare and provided higher reimbursement than the
applicable HCPCS code.

     (8)  From at least May, 1988 through approximately July, 1992, NMC Homecare
submitted to Medicare and other federal and state payers, claims that were false
or fraudulent because they billed for an IV pole for each IDPN patient each
month in a dialysis facility when such poles were not reasonable and medically
necessary to the administration of IDPN since poles adequate for the
administration of IDPN were available without additional cost to NMC and the
dialysis facilities, and when such poles were not, in fact, always delivered to
the facility.

     (9)  From at least May, 1988 through approximately June, 1996, NMC Homecare
submitted to Medicare and other federal and state payers, claims that were false
or fraudulent because they billed for an infusion pump for each IDPN patient on
service each month at the dialysis facility when such pumps were not reasonable
and medically necessary to the administration of IDPN since pumps adequate for
the administration of IDPN were available without additional cost to NMC and the
dialysis facilities, and when such pumps were not, in fact, delivered to the
facility.

     (10) At various times from at least May, 1988 through December 31, 1998,
NMC Homecare offered and paid BMAs and nonBMAs an administration fee, bag fee,
or hang fee ("hang fee"), which hang fee purported to compensate the dialysis
facility for the services and resources it devoted to administering and managing
each administration of IDPN. NMC Homecare also offered and paid
<PAGE>

to facilities or the professional employees, medical directors, officers, and
directors, other forms of remuneration, including but not limited to educational
grants, in return for the referral of IDPN business. Some or all of these hang
fees and/or other forms of remuneration were paid for the purpose of inducing
referrals for IDPN services to be paid by Medicare and others within the meaning
of the Medicare Anti-Kickback Act, 42 U.S.C. (S) 1320a-7b(b)(1)(A). NMC Homecare
and NMC submitted or caused to be submitted claims to the Medicare program and
to other federal and state payers for patients at facilities receiving hang fees
and/or other forms of remuneration. The United States contends these claim were
false or fraudulent because, regardless of whether the patient met Medicare or
other applicable coverage criteria for IDPN, the services were unlawfully
induced by kickbacks.

     H.  WHEREAS, the United States contends that the practices described in
Preamble Paragraph G above resulted in the submission of false and/or fraudulent
claims actionable under the False Claims Act, 31 U.S.C. (S)(S) 3729-3733, to the
Medicare, Railroad Medicare, TRICARE, FEHBP and VA programs and the Medicaid
programs of the Participating States and the Participating Territory.

     I.  WHEREAS, the United States also contends that it has certain
administrative claims against NMC Homecare and NMC, and against FMCH as parent,
under the provisions for permissive exclusion from the Medicare, Medicaid and
other federal health care programs, 42 U.S.C. (S) 1320a-7(b), and the provisions
for
<PAGE>

civil monetary penalties, 42 U.S.C. (S) 1320a-7a, for the Covered Conduct
described in Preamble Paragraph G.

     J.  WHEREAS, with the sole exception of the guilty plea entered by NMC
Homecare in the Criminal Action, and the statements regarding the Unpaid Claims
contained in the Preamble Paragraph G(4) above, NMC Homecare, NMC and FMCH
specifically deny and affirmatively contest the allegations of the United States
in Preamble Paragraphs G and H and the allegations of the Relators in the Civil
Actions referenced in Paragraphs K and L below, and specifically deny any
wrongdoing in connection with those claims; and further contend that NMC
Homecare's practices referenced in Preamble Paragraph G(10), were appropriate
and lawful and did not result in any violations of federal law, state law, or
common law doctrines; and further contend that the allegations of the United
States in Preamble Paragraph G(10) do not constitute violations of the False
Claims Act, 31 U.S.C. (S)(S) 3729-33, as a matter of law, and do not give rise
to any civil or administrative cause of action; and further contend that
Medicare is required to pay NMC Homecare virtually all of the amount identified
with respect to the Unpaid Claims because such services were performed, the
supplies and equipment were provided, and the patients at issue in those claims
met the Medicare coverage criteria for IDPN.

     K.  WHEREAS, Relator Ven-A-Care has filed under seal two qui tam complaints
                                                              --- ---
on behalf of the United States: United States of America ex rel. Ven-A-Care of
                                ----------------------------------------------
the Florida Keys, Inc. v. National Medical Care, Inc., National Medical Care
- ----------------------------------------------------------------------------
Inc. Homecare Division,
- ----------------------
<PAGE>

Inc., W.R. Grace and Company (a New York corporation), and W.R. Grace and
- -------------------------------------------------------------------------
Company-Conn. (a Connecticut corporation), Civil Action No. 97-10962-NG (D.
- ------------------------------------------
Mass.), originally filed as Civil Action No. 94-1234 (S.D. Fla.) in June, 1994
and transferred to D. Mass. in April - May, 1997; and United States of America
                                                      ------------------------
ex rel. Ven-A- Care of the Florida Keys, Inc. v. Fresenius Medical Care
- -----------------------------------------------------------------------
Holdings, Inc. (f/k/a W.R. Grace and Company), National Medical Care, Inc., and
- -------------------------------------------------------------------------------
National Medical Care Homecare Division, Inc., Civil Action No. 97-11033-NG (D.
- --------------------------------------------
Mass.), originally filed as Civil Action No. 94-1897 (S.D. Fla.) in September
1994 and transferred to D. Mass. in April - May 1997. These shall be referred to
as the "Ven-A-Care Civil Actions." NMC Homecare, NMC and FMCH specifically deny
any and all allegations contained in those qui tam Complaints and/or Amended
                                           --- ---
Complaints.

     L.  WHEREAS, Relator Austin filed under seal a qui tam action on behalf of
                                                    --- ---
the United States on or about November 1, 1994: United States of America ex rel.
                                                --------------------------------
Dana R. Austin and Dana R. Austin v. National Medical Care, Inc., Civil Action
- -----------------------------------------------------------------
No. 94-12164- NG (D. Mass.). This shall be referred to as the "Austin Civil
Action." NMC Homecare, NMC, and FMCH specifically deny any and all allegations
contained in Austin's qui tam Complaint and Amended Complaint.
                      --- ---

     M.  WHEREAS, in order to avoid the delay, uncertainty, inconvenience and
expense of protracted litigation of these claims, and the contentions of NMC
regarding the Unpaid Claims, the Parties reach a full and final compromise for
the Covered Conduct pursuant to the Terms and Conditions set forth below.
<PAGE>

               III.   TERMS AND CONDITIONS
                      --------------------

     NOW, THEREFORE, in reliance on the representations contained herein and in
consideration of the mutual promises, covenants, and obligations in this
Agreement, and for good and valuable consideration, receipt of which is hereby
acknowledged, the Parties agree as follows:

     1.  NMC and FMCH, collectively, agree to pay to the United States and the
Participating States, collectively, to resolve civil liabilities, the sum of two
hundred fifty three million three hundred thirty four thousand five hundred
ninety four dollars ($253,334,594)(the "Settlement Amount"), and this sum shall
constitute a debt immediately due and owing to the United States on the "First
Payment Date," which is the later of the dates on which (a) the four civil
Settlement Agreements are fully executed by the Parties, (b) all notices of
dismissal described in the civil Settlement Agreements are docketed by the
Court, or (c) the Court accepts LIFECHEM, INC.'s, NMC Medical Products, Inc.'s,
and NMC Homecare's guilty pleas and imposes the sentences set forth in their
respective Plea Agreements. NMC and FMCH, collectively, shall pay the Settlement
Amount to the United States according to the schedule terms, and instructions
contained in the Promissory Note executed contemporaneous with this Agreement,
attached as Exhibit A, and incorporated herein by reference. Within a reasonable
time after receipt of the first payment from NMC and FMCH on the First Payment
Date, the United States shall pay to the Participating States, collectively,
according to written payment instructions from the Participating
<PAGE>

States, an amount of four million eighty one thousand nine hundred fifty-one
dollars ($4,081,951) as their share of the Settlement Amount, and to the
Participating Territory, according to written payment instructions from that
Territory, an amount of one hundred ninety-four thousand two hundred twenty
eight dollars ($194,228) as its share of the Settlement Amount.

     2.  As an express condition of the Settlement Agreement, to secure NMC's
and FMCH's payment obligations under Paragraph 1 of this Agreement (and the
other civil Settlement Agreements and criminal Plea Agreements being executed
contemporaneously):

     a.  NMC and FMCH shall procure from the Bank of Nova Scotia and deliver or
cause to be delivered to the United States Attorney's Office for the District of
Massachusetts, on or before January 19, 2000, an amendment to the unconditional,
irrevocable Letter of Credit No. S020/43695/96 issued to the United States of
America on September 27, 1996 (the "Letter of Credit") to increase the amount of
the Letter of Credit to $189,634,446.00. Such amendment shall be in the form
attached as Exhibit B. Within 10 days of receipt by the U.S. Attorney's Office
of written confirmation from the transferring bank that a quarterly payment, as
described in Paragraphs 1.B. through 1.E. of the Promissory Note, or prepayment
of such quarterly payments, has been made to the United States, the United
States shall provide written permission to the Bank of Nova Scotia to reduce the
amount available for drawing under Letter of Credit No. S020/43695/96 by the
amount of the principal payment received. In the event that the entire
outstanding payment obligation
<PAGE>

secured by the Letter of Credit is prepaid, then the United States shall provide
written permission to reduce the amount available for drawing to zero. The
United States shall return this Letter of Credit for cancellation when all
obligations are paid in full or it is determined, by the United States, or
pursuant to a final and non-appealable order of a court of competent
jurisdiction, that NMC and FMCH have fulfilled all payment obligations pursuant
to this Agreement.

     b.  On January 19, 2000, NMC and FMCH shall establish an escrow account in
an initial amount of $236,401,919.00 to be held by an independent third party
agreeable to the United States, and NMC and FMCH shall increase the escrow
amount each day in an amount of $48,546.00 (through accrued interest and/or
deposits), beginning on January 20, 2000 and continuing through April 15, 2000,
when NMC and FMCH shall increase the escrow amount by an additional amount each
day of $7,271.00 (through accrued interest and/or deposits), for each quarterly
payment due before the first payment is due on the First Payment Date. On the
First Payment Date, all funds in the escrow account shall be paid to the United
States to satisfy the payment obligation in Paragraph 1. The terms and
conditions of this escrow account shall in no way limit NMC's and FMCH's payment
obligations to the United States secured by the Letter of Credit.

     3.  NMC and FMCH are in default of this Agreement on the date of occurrence
of any of the following events ("Events of Default"):
<PAGE>

          a.   Failure by NMC and FMCH to procure, deliver or maintain the
Letter of Credit;

          b.   Failure by NMC and FMCH to pay any amount provided for in the
Promissory Note attached as Exhibit A within two days of when such payment is
due and payable;

          c.   If prior to making the full payment of the amount due under the
Promissory Note (i) NMC and/or FMCH commences any case, proceeding, or other
action (A) under any law relating to bankruptcy, insolvency, reorganization or
relief of debtors, seeking to have any order for relief of debtors, or seeking
to adjudicate NMC and/or FMCH as bankrupt or insolvent, or (B) seeking
appointment of a receiver, trustee, custodian or other similar official for NMC
and/or FMCH or for all or any substantial part of NMC and/or FMCH's assets; or
(ii) there shall be commenced against NMC and/or FMCH any such case, proceeding
or other action referred to in clause (i) which results in the entry of an order
for relief and any such order remains undismissed, or undischarged or unbonded
for a period of thirty (30) days; or (iii) NMC and/or FMCH takes any action
authorizing, or in furtherance of, or indicating its consent to, approval of, or
acquiescence in, any of the acts set forth above in this sub-paragraph;

          d.   NMC and FMCH fail to comply with their obligations under
Paragraph 9 below; or

          e.   NMC and FMCH fail to establish, maintain, or make the required
payments to the escrow account described in Paragraph 2.b.
<PAGE>

     4.   If payments due under Paragraph 1 are received late, but within the
two day grace period provided in Paragraph 5.b. of the Promissory Note, interest
incurred during such grace period will be assessed at two times the daily amount
in effect on the date the payment was due.

     5.   NMC and FMCH shall provide the United States with written notice of
any such Event of Default, within two (2) business days of such event by
providing written notice by overnight mail or facsimile followed by overnight
delivery, to the United States Attorney's Office, District of Massachusetts, One
Courthouse Way, Suite 9200, Boston, MA 02210, Attention: Suzanne E. Durrell,
Assistant U.S. Attorney (or to the attention of such other person as may be
designated in writing by the United States Attorney's Office).

     6.   Immediately upon the occurrence of an Event of Default, without
further notice or presentment and demand by the United States:

          a.   The Settlement Amount plus accrued interest through the end of
the applicable quarter as set forth in Paragraph 1 of the Promissory Note (minus
any payments to date of principal and accrued interest) shall become immediately
due and payable ("Settlement Default Amount"). Interest shall be calculated on
the Settlement Default Amount at the Prime Rate as published in the Wall Street
                                                                    -----------
Journal on the Effective Date of this Agreement (as defined in Paragraph 38),
- -------
plus 5% from the date of the Event of Default.
<PAGE>

          b.   In addition, NMC and FMCH will pay the United States all
reasonable costs of collection and enforcement of this Agreement, including
attorneys' fees and expenses, plus interest as described in subparagraph 6.a.
above. The Settlement Default Amount, plus interest, described in subparagraph
6.a. above, together with the costs of collection and enforcement described in
this subparagraph, will be referred to as the "Default Obligation".

     7.   Upon the occurrence of an Event of Default, the United States may
exercise, at its sole option, one or more of the following rights:

          a.   The United States may draw the full amount available for drawing
under the Letter of Credit and retain all proceeds thereof.

          b.   The United States may enforce the terms of the Guarantee
Agreement between the United States of America, Fresenius Medical Care GMBH, a
German corporation, and the predecessor of Fresenius Medical Care AG, W.R. Grace
& Co., a New York corporation, and National Medical Care, Inc., dated July 31,
1996, attached as Exhibit C.

          c.   The United States may withhold any payment due to NMC and FMCH on
the Unpaid Claims and credit such payment to the payment obligations of NMC and
FMCH in Paragraph l;

          d.   The United States retains any and all other rights and remedies
it has or may have under law and equity.

          e.   No failure or delay on the part of the United States to exercise
any right or remedy shall operate as a waiver
<PAGE>

of the United States' rights. No single or partial exercise by the United States
of any right or remedy shall operate as a waiver of the United States' rights.

     8.   In an Event of Default under Paragraph 3.c.(Commencement of Bankruptcy
or Reorganization Proceeding):

          a.   NMC and FMCH agree not to contest or oppose any motion filed by
the United States seeking relief from or modification of the automatic stay of
11 U.S.C. (S) 362(a); not to seek relief under 11 U.S.C. (S) 105 to enjoin or
restrain the United States from recovering monies owed by NMC and FMCH arising
out of this Agreement or the attached Promissory Note, or from recovering monies
through presentment against the Letter of Credit. NMC and FMCH recognize that
this express waiver is in consideration for the settlement of claims by the
United States described in Paragraph H above, under the terms and conditions
contained in this Settlement Agreement.

          b.   By expressly waiving the automatic stay provision, NMC and FMCH
agree not to oppose or interfere with any motion made in federal court
(including bankruptcy courts) by the United States to exclude NMC Homecare from
participation in the Title XVIII (Medicare), Title XIX (Medicaid) programs, and
other federal health care programs;

          c.   This Agreement shall be voidable at the sole option of the United
States;

          d.   If any term(s) of this Agreement are set aside for any reason,
including as a result of a preference action brought pursuant to 11 U.S.C. (S)
547, the United States, at its sole
<PAGE>

option and in its discretion, may rescind all terms of this Agreement and seek
recovery of the full amount of claims and allegations identified herein and in
the Civil Actions, or, in the alternative, enforce the remaining terms of this
Agreement. In the event of rescission of this Agreement, all Parties reserve all
rights, claims, and defenses that are available under law and equity as of the
Effective Date of this Agreement; and

          e.   In addition to the rights enumerated in Paragraph 7.a. through
7.e. above, the United States and all other Parties shall retain all rights and
claims they have or may have under law and equity.

     9.   Within 30 days after the First Payment Date, NMC Homecare, NMC, FMCH,
and the NMC Companies shall take all reasonable steps that the United States
Attorney's Office for the District of Massachusetts, acting on behalf of OHA,
the Appeals Council, HCFA, the DMERCs and HHS-OIG, may deem necessary, to
dismiss with prejudice or withdraw with prejudice, or effect the dismissal with
prejudice or withdrawal with prejudice, of any of the Unpaid Claims, and any and
all other IDPN claims or appeals in which NMC Homecare, NMC, FMCH, or the NMC
Companies have an interest, for dates of service through December 31, 1999,
including without limitation all claims pending before Administrative Law Judge
Stewart.

     NMC Homecare, NMC, FMCH and the NMC Companies further agree that they shall
release and disclaim any further right, interest, or remedy with respect to
these Unpaid Claims and to any other unpaid IDPN claims with dates of service
through December 31, 1999; that they will use their best efforts to promptly
refund to the DMERCs, and notify the United States Attorney's Office for the
District of Massachusetts, HCFA, and HHS-OIG of any payments received after
December 31,
<PAGE>

1999 from HCFA pertaining to the Unpaid Claims; and that they will notify the
United States Attorney's Office for the District of Massachusetts, HCFA and HHS-
OIG, of any notice or action by the DMERCs, OHA and/or the Medicare Appeals
Council concerning any review or consideration of any Unpaid Claims.

     NMC Homecare, NMC, FMCH, and the NMC Companies further agree to terminate
the proceedings currently pending before ALJ Stewart captioned "In the Matter of
NMC Homecare, Inc.", and agree not to use the record, evidence and/or testimony
from that proceeding in any future appeals or reviews of IDPN Medicare claims or
in any judicial or administrative proceeding involving IDPN to which HCFA is a
party or in which it has an interest.

     10.  In consideration for NMC Homecare, NMC, the NMC Companies, and FMCH's
obligations under this Agreement, and in compromise of NMC's contentions that
HCFA is required to pay to NMC Homecare virtually all of the Unpaid Claims, the
United States shall pay to NMC and FMCH collectively the principal sum of
$59,150,766 (the "Unpaid Claims Settlement Amount") plus annual interest of 7.5%
compounded quarterly from the First Payment Date of this Agreement. The United
States' obligation to pay the Unpaid Claims Settlement Amount to NMC and FMCH is
contingent upon the United States receiving the Settlement Amount as required by
this Agreement and the Promissory Note attached
<PAGE>

hereto as Exhibit A, and upon NMC Homecare, NMC, FMCH, and the NMC Companies
complying with the obligations set forth in Paragraph 9 above. Provided these
contingencies are satisfied, the United States will pay the Unpaid Claims
Settlement Amount plus interest to NMC and FMCH on the following schedule:
$38,394,894 of the principal 30 days after the First Payment Date, plus
interest; and four equal principal payments of $5,188,968, plus interest, 30
days after receipt each of the quarterly payments made by NMC and FMCH under the
Promissory Note. Any such payments by the United States shall be made upon
written payment instructions to be provided to the United States by NMC and
FMCH. NMC intends to deem the resolution of the Unpaid Claims to be a pro rata
denial by HCFA/Medicare.

     11.  Subject to the exceptions and limitations in Paragraph 12 below, in
consideration of the obligations of NMC Homecare, NMC, FMCH, and the NMC
Companies set forth in this Agreement, conditioned upon payment in full of the
Settlement Amount, subject to Paragraph 33  below (concerning bankruptcy
proceedings commenced within 91 days of any payment under this Agreement), and
subject to the acceptance by the United States District Court for the District
of Massachusetts of NMC Homecare's guilty plea as described in Preamble
Paragraph F, the United States, on behalf of itself, and its officers, agents,
agencies, and departments, will release and will be deemed to have released NMC
Homecare, its parents, including NMC and FMCH, and the subsidiaries of NMC
Homecare, NMC and FMCH listed on the attached Exhibit D (collectively, the
parents and subsidiaries of NMC and
<PAGE>

FMCH listed on Exhibit D will be referred to as the "NMC Companies," and the
corporate entities listed on Exhibit D comprise the only entities which
constitute the "NMC Companies" within the meaning of this Agreement), and the
current directors, officers, employees, and agents of the NMC Companies who were
not employed by or in any way affiliated with NMC Homecare, NMC, or NMC's
parents, subsidiaries, divisions, or affiliates at any time prior to September
30, 1996, from any civil or administrative monetary claim (including recoupment
claims) that the United States has or may have under the False Claims Act, 31
U.S.C. (S)(S) 3729-3733; the Program Fraud Civil Remedies Act, 31 U.S.C. (S)(S)
3801-3812; the Civil Monetary Penalties Law, 42 U.S.C. (S) 1320a-7a; or common
law claims for fraud, payment by mistake of fact, breach of contract or unjust
enrichment for the Covered Conduct described in Preamble Paragraph G above with
respect to IDPN claims submitted or caused to be submitted to Medicare, Railroad
Retirement Medicare, TRICARE, FEHBP, the VA, and/or the Medicaid programs of the
Participating States.

     12.  Notwithstanding any term of this Agreement, the United States
specifically does not release NMC Homecare, the NMC Companies, or any individual
from any and all of the following: (a) any potential criminal, civil or
administrative claims arising under Title 26, U.S. Code (Internal Revenue Code);
(b) any criminal liability; (c) any potential liability to the United States (or
any agencies thereof) for any conduct other than that identified in Preamble
Paragraph G above, including but not limited to any allegations in the Civil
Actions not encompassed
<PAGE>

by Preamble Paragraph G; (d) any entities not specifically included on the list
of NMC Companies set forth in Exhibit D, such omitted entities specifically
including, but not limited to, SRC Holdings Company, Inc. (also known as Spectra
Renal Management); (e) any claims based upon such obligations as are created by
this Agreement; (f) except as explicitly stated in this Agreement, any
administrative liability, including mandatory exclusion from Federal health care
programs; (g) any express or implied warranty claims or other claims for
defective or deficient products and services provided by NMC Homecare or
including quality of testing or product claims; (h) any claims for personal
injury or property damage or for other consequential damages arising from the
conduct described in Preamble Paragraph G above; (i) any claims based upon
failure to deliver items or services; (j) any civil or administrative claims
against any individual who was an officer, director, trustee, agent, employee,
or was in any way affiliated with NMC Homecare, NMC, or NMC's parents,
subsidiaries, divisions, or affiliates at any time prior to September 30, 1996;
or (k) any civil or administrative claims against any individual, including
current directors, officers, employees and agents, who is criminally indicted or
convicted of an offense, or who enters a criminal plea related to the conduct
alleged in Preamble Paragraph G above.

     13.  In compromise and settlement of the rights of OIG-HHS to exclude NMC
Homecare and pursuant to 42 U.S.C. (S) 1320a-7(a)(1), NMC Homecare agrees to be
permanently excluded under this statutory provision from participation in
Medicare,
<PAGE>

Medicaid, and all other federal health care programs as defined in 42 U.S.C. (S)
1320a-7b(f). Such exclusion will have national effect and will also apply to all
other Federal procurement and non-procurement programs. Federal health care
programs will not reimburse NMC Homecare and/or any one else for items or
services, including administrative and management services, furnished, ordered
or prescribed by NMC Homecare and in any capacity. NMC Homecare waive any
further notice of this exclusion and agree not to contest such exclusion either
administratively or in any State or Federal court. If NMC Homecare submits or
causes claims to be submitted for services provided while excluded, Homecare is
subject to the imposition of additional civil monetary penalties and
assessments. NMC Homecare further agrees to hold the federal programs, and all
the federal programs' beneficiaries and/or sponsors, harmless from any financial
responsibility for services furnished, ordered or prescribed to such
beneficiaries or sponsors after the effective date of this exclusion. NMC
Homecare specifically waives its rights under any statute or regulation to
payment from the Medicare, Railroad Retirement Medicare, TRICARE, VA, FEHBP or
Medicaid programs for services rendered after the effective date of this
exclusion. This exclusion will be effective upon the date NMC Homecare receives
from the OIG the notice of exclusion.

     14.  FMCH, on behalf of itself and its affiliates, subsidiaries, and
divisions, including but not limited to NMC, has entered into a Corporate
Integrity Agreement with HHS, which Agreement is incorporated herein by
reference.  FMCH will
<PAGE>

immediately upon execution of this Agreement implement its obligations under the
Corporate Integrity Agreement.

     15.  In consideration of the obligations of NMC Homecare, NMC and FMCH set
forth in this Agreement, conditioned upon payment in full of the Settlement
Amount, subject to Paragraph 33  below (concerning bankruptcy proceedings
commenced within 91 days of any payment under this Agreement), and conditioned
upon FMCH's entering into the Corporate Integrity Agreement, the OIG-HHS agrees
to release and refrain from instituting, directing, or maintaining any
administrative claim or any action seeking exclusion from the Medicare, Medicaid
or other Federal health care programs (as defined in 42 U.S.C. (S) 1320a-7b(f))
against the NMC Companies and the current directors, officers, employees, and
agents of the NMC Companies who were not employed by or in any way affiliated
with NMC Homecare, NMC, or any of NMC's parents, subsidiaries, divisions, or
affiliates at any time prior to September 30, 1996, under 42 U.S.C. (S) 1320a-7a
(Civil Monetary Penalties Law) or 42 U.S.C. (S) 1320a-7(b) (permissive
exclusion) for the conduct described in Preamble Paragraph G, except as reserved
in Paragraph 12 above and as reserved in this Paragraph.  The OIG-HHS expressly
reserves all rights to comply with any statutory obligations to exclude the NMC
Companies from the Medicare, Medicaid, or other Federal health care programs
under 42 U.S.C. (S) 1320a-7(a)(mandatory exclusion).  Nothing in this Paragraph
precludes the OIG-HHS from taking action against entities or individuals for
conduct and practices for which civil claims have been reserved in Paragraph 12
above.
<PAGE>

     16.  In consideration of the obligations of NMC Homecare, NMC and FMCH set
forth in this Agreement, conditioned upon payment in full of the Settlement
Amount, and subject to Paragraph 33 below (concerning bankruptcy proceedings
commenced within 91 days of any payment under this Agreement), TSO agrees to
release and refrain from instituting, directing, or maintaining any
administrative claim or any action seeking exclusion from the TRICARE program
against the NMC Companies and the current directors, officers, employees, and
agents of the NMC Companies who were not employed by or in any way affiliated
with NMC Homecare, NMC or NMC's subsidiaries, divisions, and affiliates at any
time prior to September 30, 1996, under 32 C.F.R. (S) 199.9 for the conduct
described in Preamble Paragraph G, except as reserved in Paragraph 12 above and
as reserved in this Paragraph.  The TSO expressly reserves all rights to comply
with any statutory obligations to exclude the NMC Companies from the TRICARE
program under 32 C.F.R. (S)(S) 199.9(f)(1)(i)(A), (f)(1)(i)(B), (f)(1)(i)(D),
and (f)(1)(iii).  Nothing in this Paragraph precludes the TSO from taking action
against entities or persons, or for conduct or practices, for which civil claims
have been reserved in Paragraph 12 above.

     17.  In consideration of the obligations of NMC Homecare, NMC and FMCH as
set forth in this Agreement, conditioned upon payment in full of the Settlement
Amount, and subject to Paragraph 33 below (concerning bankruptcy proceedings
commenced within 91 days of any payment under this Agreement), OPM agrees to
release and refrain from instituting, directing, or
<PAGE>

maintaining any administrative claim or any action seeking exclusion from FEHBP
against the NMC Companies and the current directors, officers, employees, and
agents of the NMC Companies who were not employed by or in any way affiliated
with NMC Homecare, NMC or NMC's subsidiaries, divisions, or affiliates at any
time prior to September 30, 1996, under 5 U.S.C. (S) 8902a or 5 C.F.R. Part 970
for the conduct described in Preamble Paragraph G including that in the Civil
Actions, except as reserved in Paragraph 12 above, and except if the NMC
Companies or any individuals are excluded by the Office of Inspector General of
HHS pursuant to 42 U.S.C. (S) 1320a-7(a). Nothing in this paragraph precludes
OPM from taking action against entities or persons, or for conduct and practice
for which civil claims have been reserved in Paragraph 12 above.

     18.  a. Relator Ven-A-Care agrees that the settlement of the Ven-A-Care
Civil Actions is fair, adequate and reasonable under all the circumstances,
pursuant to 31 U.S.C. (S) 3730(c)(2)(B).  On the United States' receipt of the
first payment required by  Paragraph 1, Relator Ven-A-Care, for itself, its
current and former directors and officers (including, without limitation,
Zachary T. Bentley, Luis E. Cobo, and T. Mark Jones), and its heirs, successors
and assigns, will release and will be deemed to have released the NMC Companies,
NMC Homecare, NMC, and FMCH and Spectra Laboratories, Inc., SRC Holdings
Company, Inc., Qix, Inc., Spectra Medical Products, Inc., and Spectra
Laboratories Information Services, Inc., and their present and former officers,
directors, employees, counsel, agents, representatives,
<PAGE>

heirs, and assigns, from any and all claims that Relator Ven-A-Care has or may
have related to or arising from any and all of the allegations in its Civil
Actions, and the conduct described in Preamble Paragraph G, except claims by
Relator Ven-A-Care for expenses necessarily incurred and attorney's fees and
costs pursuant to 31 U.S.C. (S) 3730(d)(1). If NMC and FMCH default on their
payment obligations under Paragraph 1 above, the release given by Relator Ven-A-
Care shall, at the sole option and discretion of Ven-A-Care upon written notice
to NMC and FMCH, be rescinded.

          b.   On the United States' receipt of the first payment required by
Paragraph 1, Zachary T. Bentley ("Bentley"), Luis E. Cobo ("Cobo"), and T. Mark
Jones ("Jones"), individually, for themselves, their heirs, successors and
assigns, will release and will be deemed to have released the NMC Companies, NMC
Homecare, NMC and FMCH and Spectra Laboratories, Inc., SRC Holdings Company,
Inc., Qix, Inc., Spectra Medical Products, Inc., and Spectra Laboratories
Information Services, Inc., and their present and former officers, directors,
employees, counsel, agents, representatives, heirs, and assigns, from any and
all claims that Bentley, Jones and/or Cobo has or may have related to or arising
from any and all of the allegations in the Ven-A-Care Civil Actions, and the
conduct described in Preamble Paragraph G, except claims by Relator Ven-A-Care
for expenses necessarily incurred and attorney's fees and costs pursuant to 31
U.S.C. (S) 3730(d)(1).  If NMC and FMCH default on their payment obligations
under Paragraph 1 above, the release given by Bentley, Cobo, and
<PAGE>

Jones shall, at each's sole option and discretion upon written notice to NMC and
FMCH, be rescinded.

     19.  Relator Austin agrees that the settlement of the Austin Civil Action
is fair, adequate and reasonable under all the circumstances, pursuant to 31
U.S.C. (S) 3730(c)(2)(B).  On the United States' receipt of the first payment
required by Paragraph 1, Relator Austin, for himself, his heirs, successors and
assigns, will release and will be deemed to have released the NMC Companies,
NMC, NMC Homecare, FMCH and Spectra Laboratories, Inc., SRC Holdings Company,
Inc., Qix, Inc., Spectra Medical Products, Inc., and Spectra Laboratories
Information Services, Inc., and their present and former officers, directors,
employees, counsel, agents, representatives, heirs, and assigns from any and all
claims that Relator Austin has or may have related to or arising from any and
all of the allegations in his Civil Action, and the conduct described in
Preamble Paragraph G, with the exception of Relator Austin's claim for expenses
necessarily incurred and attorney's fees and costs pursuant to 31 U.S.C. (S)
3730(d)(1).  If NMC and FMCH default on their payment obligations under
Paragraph 1 above, the release given by Relator Austin shall, at his sole option
and discretion, upon written notice to NMC and FMCH, be rescinded.

     20.  The United States agrees to pay the Relator Ven-A-Care $40,347,463 in
principal, plus 16.2% of any interest paid by NMC and FMCH on the federal share
of the Settlement Amount.  The United States agrees to pay the Relator Austin
$4,483,052, in principal, plus 1.8% of any interest paid by NMC and FMCH on the
<PAGE>

federal share of the Settlement Amount.  The United States will make these
payments to Relators from the amounts paid by NMC and FMCH, and will make the
first payment to each such Relator within 21 days after the First Payment Date,
and subsequent payments to the Relators within 21 days after each additional
payment is received by the United States, by wire transfer to each of the
Relators in accordance with instructions to be provided by each Relator's
counsel.  Relators Ven-A-Care and Austin, for themselves individually, and for
their respective heirs, successors, and assigns, will release and will be deemed
to have released and forever discharged the United States from any claims
pursuant to 31 U.S.C. (S) 3730, including 31 U.S.C. (S)(S) 3730(b),(c),(d) and
(d)(l), for a share of the proceeds of their Civil Actions relating to the
Covered Conduct in Preamble Paragraph G above, from any claims for a share of
the Settlement Amount, from any claims for a share of the Unpaid Claims amount
or other denied claims to be withdrawn or released by the NMC Companies in
Paragraph 9 above, and in full settlement of any and all claims that each
Relator has or may have that arise from or relate to any and all of the
allegations in their respective Civil Actions, except Relator Ven-A-Care's
claims regarding Epogen in its Amended Complaint filed in July 1996 in Civil
Action No. 94-1234 (S.D. Fla.), transferred to the District of Massachusetts and
now pending as Civil Action No. 97-10962-NG (D. Mass.).  This Agreement does not
resolve or in any manner affect any claims the United States has or may have
against any Relators
<PAGE>

Ven-A-Care or Austin arising under Title 26, U.S. Code (Internal Revenue Code),
or any claims arising under this Agreement.

     21.  After this Agreement is fully executed, the United States and the
Relators will notify the Court that all pertinent Parties have stipulated that,
to the extent alleged in Paragraph G only, the Civil Actions shall be dismissed
with prejudice effective upon receipt by the United States and the Participating
States of the payments described in Paragraph 1 above, pursuant to and
consistent with the terms of this Agreement.  The United States and the Relators
will also notify the Court that all pertinent Parties have stipulated that the
remaining claims by the Relators in the Civil Actions, to the extent not alleged
in Preamble Paragraph G, shall be dismissed with prejudice as to the Relators
and without prejudice as to the United States, with the exceptions of: the
Relators' claims for expenses necessarily incurred and attorney's fees and costs
pursuant to 31 U.S.C. (S) 3730(d)(1); and Relator Ven-A-Care's claims regarding
Epogen in its Amended Complaint filed in July 1996 in Civil Action No. 94-1234
(S.D. Fla.), transferred to the District of Massachusetts and now pending as
Civil Action No. 97-10962-NG (D. Mass.), none of which shall be dismissed.  The
Parties agree that the United States District Court for the District of
Massachusetts shall maintain jurisdiction of the Civil Actions in the event that
the Plea Agreement referenced in Preamble Paragraph F is not accepted by the
Court, in any Events of Default, in the event of disputes under this Agreement,
and for purposes of the Relators' claims for expenses necessarily incurred and
attorneys' fees and costs.
<PAGE>

NMC and FMCH agree that the Relators are entitled to reasonable expenses
necessarily incurred and reasonable attorney's fees and costs and agree to pay
the same.

     22.  Effective upon the filing and docketing of the notices of dismissal
described in Paragraph 21, and the acceptance by the Court of the Plea Agreement
referenced in Preamble Paragraph F,  the NMC Companies, NMC, NMC Homecare and
FMCH, and Spectra Laboratories, SRC Holdings Company, Inc., Qix, Inc., Spectra
Medical Products, Inc., and Spectra Laboratories Information Services, Inc.,
release and will be deemed to have released Ven-A-Care and Austin, individually
and collectively, and the current and former officers, directors, employees,
counsel, agents, representatives, heirs, successors and assigns of Ven-A-Care
from any and all claims that these corporations have or may have related to or
arising from any of the allegations in the Civil Actions, the conduct described
in Preamble Paragraph G, and any matters arising from Relator Austin's
employment with the corporate entities referenced in this Paragraph.

     23.  NMC Homecare, NMC and FMCH, and the NMC Companies waive and will not
assert any defenses these entities may have to any criminal prosecution or
administrative action relating to the conduct described in Preamble Paragraph G,
which defenses may be based in whole or in part on a contention that, under the
Double Jeopardy Clause of the Fifth Amendment of the Constitution or Excessive
Fines Clause of the Eighth Amendment of the Constitution, this Settlement
Agreement bars a remedy sought in such criminal prosecution or administrative
action.
<PAGE>

NMC Homecare, NMC, FMCH, and the NMC Companies further agree that nothing in
this Agreement is punitive in purpose or effect.

     24.  The NMC Companies covenant to cooperate fully and truthfully with the
United States' civil investigation of individuals and entities not specifically
released in this Agreement.  Upon reasonable notice the NMC Companies will make
reasonable efforts to facilitate access to, and encourage the cooperation of,
its directors, officers, and employees for interviews and testimony, consistent
with the rights and privileges of such individuals, and will furnish to the
United States, upon reasonable request, all non-privileged documents and records
in its possession, custody or control.

     25.  Effective on the date of acceptance by the Court of the Plea Agreement
referenced in Preamble Paragraph F, NMC Homecare, NMC, FMCH, and the NMC
Companies release and will be deemed to have released the United States, its
agencies, employees, servants, and agents from any claims (including attorneys'
fees, costs, and expenses of every kind and however denominated) which Homecare,
and the NMC Companies have or may have against the United States, its agencies,
employees, servants, and agents, related to or arising from the United States'
civil, criminal and administrative investigation and prosecution of Homecare,
NMC and FMCH.

     26.  The Settlement Amount that NMC and FMCH must pay pursuant to Paragraph
1 of this Agreement above will not be decreased as a result of the denial of
claims for payment being withheld from payment by any Medicare carrier or
intermediary,
<PAGE>

Railroad Retirement Medicare carrier, TRICARE, FEHBP, VA, or any Medicaid payer
on the Effective Date of this Agreement, or pending on appeal for dates of
service prior to January 1, 2000 on the Effective Date of this Agreement,
related to the conduct described in Preamble Paragraph G; and NMC Homecare, NMC
and FMCH, and the NMC Companies agree not to resubmit to any Medicare carrier or
intermediary, Railroad Retirement Medicare carrier, TRICARE, FEHBP, VA, or any
Medicaid payer any previously denied claims related to the conduct described in
Preamble Paragraph G, and agree not to appeal any such denials of claims.

     27.  The NMC Companies agree that all costs (as defined in the Federal
Acquisition Regulations ("FAR") (S) 31.205-47 and in Titles XVIII and XIX of the
Social Security Act, 42 U.S.C. (S)(S) 1395-1395ddd (1997) and 1396-1396v(1997),
and the regulations promulgated thereunder) incurred by or on behalf of NMC
Homecare, and the NMC Companies, and their divisions, subsidiaries and
affiliates, and their present and former officers, directors, employees,
shareholders and agents in connection with:  (a) the matters covered by this
Agreement and the related Plea Agreement described in Preamble Paragraph F; (b)
the Government's administrative, civil and criminal investigation and
prosecution of NMC Homecare, NMC, and FMCH; (c) these corporate entities'
investigation, defense, and corrective actions undertaken in response to the
Government's administrative, civil and criminal investigations, and in
connection with the matters covered by this Agreement, the Plea Agreements, and
including the obligations undertaken pursuant to the Corporate Integrity
<PAGE>

Agreement (including attorneys fees); (d) the negotiation and performance of
this Agreement, the Plea Agreements, and the Corporate Integrity Agreement; and
(e) the payments made to the United States provided for in this Agreement and
the Plea Agreements, and to Relators for expenses necessarily incurred and
attorney's fees and costs or wrongful termination claims, are unallowable costs
on Government contracts and under Medicare, Railroad Retirement Medicare,
Medicaid, TRICARE, FEHBP, and the VA programs (hereafter "unallowable costs").
These unallowable costs will be separately estimated and accounted for by NMC
Homecare and the NMC Companies and these entities will not charge such
unallowable costs directly or indirectly to any contracts with the United States
or any Medicaid program, or seek payment for such unallowable costs through any
cost report, cost statement, information statement or payment request submitted
by the NMC Companies or any of their divisions, subsidiaries or affiliates to
the Medicare, Railroad Retirement Medicare, Medicaid, TRICARE, VA or FEHBP
programs.

     NMC Homecare and the NMC Companies further agree that within 270 days of
the effective date of this Agreement these entities will identify to applicable
Medicare, Railroad Retirement Medicare, and TRICARE fiscal intermediaries,
carriers and/or contractors, and Medicaid, VA and FEHBP fiscal agents, any
unallowable costs (as defined above) included in payments previously sought from
the United States, or any Medicaid Program, including, but not limited to,
payments sought in any cost reports, cost statements, information reports, or
payment
<PAGE>

requests already submitted by the NMC Companies or any of their subsidiaries,
affiliates, or divisions and will request, and agree, that such cost reports,
cost statements, information reports or payment requests, even if already
settled, be adjusted to account for the effect of the inclusion of the
unallowable costs. NMC Homecare and the NMC Companies agree that the United
States will be entitled to recoup from the NMC Companies any overpayment as a
result of the inclusion of such unallowable costs on previously-submitted cost
reports, information reports, cost statements or requests for payment. Any
payments due after the adjustments have been made shall be paid to the United
States pursuant to the direction of the Department of Justice, and/or the
affected agencies. The United States reserves its rights to disagree with any
calculations submitted by NMC Homecare, the NMC Companies, or any of their
subsidiaries, affiliates or divisions, on the effect of inclusion of unallowable
costs (as defined above) on the NMC Companies or any of their subsidiaries,
affiliates or divisions' cost reports, cost statements or information reports.
Nothing in this Agreement shall constitute a waiver of the rights of the United
States to examine or reexamine the unallowable costs described above.

     28.  This Agreement is intended to be for the benefit of the Parties only,
and by this instrument the Parties do not release any claims against any other
person or entity except as specifically identified in Paragraphs 11, 15, 16, 17,
18, 19, and 22 above.
<PAGE>

     29.  NMC Homecare and the NMC Companies agree that they will not seek
payment for any of the health care billings covered by this Agreement from any
health care beneficiaries or their parents, sponsors, estates, heirs, successors
or assigns.  NMC Homecare and the NMC Companies waive any causes of action
against these beneficiaries or their parents, sponsors, estates, heirs,
successors, or assigns based upon the claims for payment covered by this
Agreement.

     30.  Nothing in this Agreement constitutes an agreement by the United
States concerning the characterization of the amounts paid hereunder for
purposes of any proceeding under Title 26 of the Internal Revenue Code.

     31.  Except as provided in Paragraph 6, and except for Relators' claims for
expenses necessarily incurred and attorney's fees and costs, each party to this
Agreement will bear its own legal and other costs incurred in connection with
this matter, including by way of example only, all costs incurred in the
investigation and defense of this matter, the preparation and performance of
this Agreement, and all corrective actions taken in response to the
investigation and resolution of this matter.

     32.  NMC and FMCH expressly warrant that they have reviewed their financial
condition and that they currently are solvent on a consolidated basis within the
meaning of 11 U.S.C. Section 547(b)(3), and expect to remain solvent on a
consolidated basis following payment to the United States hereunder.  Further,
the Parties expressly warrant that, in evaluating whether to execute this
Agreement, the Parties (a) have intended that the mutual
<PAGE>

promises, covenants and obligations set forth herein constitute a
contemporaneous exchange for new value given to NMC Homecare, NMC and FMCH
within the meaning of 11 U.S.C. Section 547(c)(1), and (b) have concluded that
these mutual promises, covenants, and obligations do, in fact, constitute such a
contemporaneous exchange.

     33.  In the event NMC or FMCH commences, or a third party commences, within
91 days of any payment under of this Agreement, any case, proceeding, or other
action (i) under any law relating to bankruptcy, insolvency, reorganization or
relief of debtors, seeking to have any order for relief of NMC and/or FMCH's
debts, or seeking to adjudicate NMC and/or FMCH as bankrupt or insolvent, or
(ii) seeking appointment of a receiver, trustee, custodian or other similar
official for NMC and/or FMCH or for all or any substantial part of NMC and/or
FMCH's assets, NMC and FMCH agree as follows:

          a.   NMC and FMCH's obligations under this Agreement may not be
avoided pursuant to 11 U.S.C. Section 547, and NMC and FMCH will not argue or
otherwise take the position in any such case, proceeding or action that:  (i)
NMC and/or FMCH's obligations under this Agreement may be avoided under 11
U.S.C. Section 547; (ii) NMC and FMCH were insolvent on a consolidated basis at
the time this Agreement was entered into, or became insolvent on a consolidated
basis as a result of the payment made to the United States hereunder; or (iii)
the mutual promises, covenants and obligations set forth in this Agreement do
not
<PAGE>

constitute a contemporaneous exchange for new value given to NMC and/or FMCH.

          b.   In the event that NMC and/or FMCH's obligations hereunder are
avoided pursuant to 11 U.S.C. Section 547, the United States, at its sole
option, may rescind the releases in this Agreement, and bring any civil and/or
administrative claim, action or proceeding against NMC Homecare, NMC, and/or
FMCH for the claims that would otherwise be covered by the releases provided in
Paragraphs 11, 15, 16, and 17 above.  If the United States chooses to do so, NMC
Homecare, NMC and FMCH agree that (i) any such claims, actions or proceedings
brought by the United States (including any proceedings to exclude NMC Homecare
from participation in Medicare, Medicaid, or other federal health care programs)
are not subject to an "automatic stay" pursuant to 11 U.S.C. Section 362(a) as a
result of the action, case or proceeding described in the first clause of this
Paragraph, and that NMC Homecare, NMC and FMCH will not argue or otherwise
contend that the United States' claims, actions or proceedings are subject to an
automatic stay; (ii) that NMC Homecare, NMC and FMCH will not plead, argue or
otherwise raise any defenses under the theories of statute of limitations,
laches, estoppel or similar theories, to any such civil or administrative
claims, actions or proceeding which are brought by the United States within 90
calendar days of written notification to NMC and FMCH that the releases herein
have been rescinded pursuant to this Paragraph; and (iii) the United States has
a valid claim against NMC and FMCH in the amount of the Default Obligation, and
the
<PAGE>

United States may pursue its claim, inter alia, in the case, action or
proceeding referenced in the first clause of this Paragraph, as well as in any
other case, action, or proceeding.

          c.   NMC Homecare, NMC and FMCH acknowledge that its agreements in
this Paragraph are provided in exchange for valuable consideration provided in
this Agreement.

     34.  NMC Homecare, NMC, FMCH and the Relators represent that this Agreement
is freely and voluntarily entered into without any degree of duress or
compulsion whatsoever.

     35.  This Agreement is governed by the laws of the United States.  The
Parties agree that the exclusive jurisdiction and venue for any disputes arising
between and among the Parties under this Agreement will be the United States
District Court for the District of Massachusetts, except that disputes rising
under the Corporate Integrity Agreement shall be resolved exclusively upon the
dispute resolution provisions set forth in the Corporate Integrity Agreement.

     36.  The undersigned NMC Homecare, NMC and FMCH signatories represent and
warrant that they are authorized by their respective Board of Directors to
execute this Agreement.  The undersigned United States signatories represent
that they are signing this Agreement in their respective official capacities and
that they are authorized to execute this Agreement.

     37.  Except for the guilty plea by NMC Homecare and the representations in
Paragraph 32 (regarding solvency), and Paragraph 33 (concerning bankruptcy
proceedings commenced within 91 days of any payments under this Agreement), the
Parties agree
<PAGE>

that nothing in this Agreement constitutes an admission by any person or entity
with respect to any issue of law or fact.

     38.  This Agreement is effective on the date of signature of the last
signatory to the Agreement (the "Effective Date").

     39.  This Agreement shall be binding on all successors, transferees, heirs
and assigns.

     40.  This Agreement, together with Exhibits A through D, the Plea Agreement
described in Preamble Paragraph F, and the Corporate Integrity Agreement,
constitute the complete agreement among the Parties with regard to the conduct
described in Preamble Paragraph G and the Civil Actions.  This Agreement may not
be amended except by written consent of the Parties, except that only FMCH and
OIG-HHS must agree in writing to modification of the Corporate Integrity
Agreement.

     41.  This Agreement may be executed in counterparts, each of which shall
constitute an original and all of which shall constitute one and the same
Agreement.

                         THE UNITED STATES OF AMERICA
                         ----------------------------


By:  /s/ Suzanne E. Durrell         Dated:  January 18, 2000
     ---------------------------            ------------------
     SUZANNE E. DURRELL
     Assistant U.S. Attorney
     District of Massachusetts

By:  /s/ Patricia Connolly          Dated:  January 18, 2000
     ---------------------------            ------------------
     PATRICIA CONNOLLY
     Special Assistant U.S. Attorney
     District of Massachusetts
<PAGE>

By:  /s/ Mark Lavine               Dated:   January 18, 2000
     --------------------------             ------------------
     MARK LAVINE
     Assistant U.S. Attorney
     Southern District of Florida

By:  /s/ Maya S. Guerra             Dated:  January 19, 2000
     --------------------------             ------------------
     MAYA S. GUERRA
     Trial Attorney
     Civil Division
     U.S. Department of Justice

By:  /s/ Lewis Morris               Dated:      1/18/00
     --------------------------             ------------------
     LEWIS MORRIS
     Assistant Inspector General
     Office of Inspector General
     U.S. Department of Health and
          Human Services

By:  /s/ Frank D. Titus             Dated:  Jan. 18, 2000
     --------------------------             ------------------
     FRANK D. TITUS
     Assistant Director for
          Insurance Programs
     U.S. Office of Personnel
          Management

By:  /s/ Robert D. Seaman           Dated:   1-18-00
     --------------------------             ------------------
     ROBERT D. SEAMAN
     General Counsel
     TRICARE Support Office
     U.S. Department of Defense
<PAGE>

               NMC HOMECARE, INC., NATIONAL MEDICAL CARE, INC.,
                     FRESENIUS MEDICAL CARE HOLDINGS, INC.


By:  /s/ Ben J. Lipps                    Dated:      1/18/00
     ------------------------                   --------------------
     BEN J. LIPPS
     President
     NMC Homecare, Inc.

By:  /s/ Ben J. Lipps                    Dated:      1/18/00
     ------------------------                   --------------------
     BEN J. LIPPS
     President
     National Medical Care, Inc.

By:  /s/ Ben J. Lipps                    Dated:      1/18/00
     ------------------------                   --------------------
     BEN J. LIPPS
     President
     Fresenius Medical Care Holdings, Inc.

Acknowledged:
- ------------

By:  /s/ Jonathan Chiel                  Dated: January 18, 2000
     ------------------------                   --------------------
     JONATHAN CHIEL

By:  /s/ Alan E. Reider                  Dated:      1/18/00
     ------------------------                   --------------------
     ALAN E. REIDER

By:  /s/ Ronald L. Castle                Dated:      1/18/00
     ------------------------                   --------------------
     RONALD L. CASTLE

     Counsel to NMC Homecare, Inc.
     National Medical Care, Inc.
     Fresenius Medical Care Holdings, Inc.

<PAGE>

                 RELATOR VEN-A-CARE OF THE FLORIDA KEYS, INC.


By:  /s/ Zachary T. Bentley         Dated:     1/18/00
     -----------------------               -------------------
     ZACHARY T. BENTLEY,
     President

By:  /s/ T. Mark Jones              Dated:     1/18/00
     -----------------------               -------------------
     T. MARK JONES,
     Vice President and
     Secretary

By:  /s/ Luis E. Cobo               Dated:     1/18/00
     -----------------------               -------------------
     LUIS E. COBO,
     Former President

By:  /s/ Zachary T. Bentley         Dated:     1/18/00
     -----------------------               -------------------
     ZACHARY T. BENTLEY,
     Individually, as to Paragraph
     18.b. only

By:  /s/ T. Mark Jones              Dated:     1/18/00
     -----------------------               -------------------
     T. MARK JONES,
     Individually, as to Paragraph
     18.b. only

By:  /s/ Luis E. Cobo               Dated:     1/18/00
     -----------------------               -------------------
     LUIS E. COBO,
     Individually, as to Paragraph
     18.b. only


Acknowledged:
- ------------

By:  /s/ Atlee W. Wampler III       Dated: January 18, 2000
     ------------------------              -------------------
     ATLEE W. WAMPLER, III


By:  /s/ James J. Breen             Dated:     1/18/00
     -----------------------               -------------------
     JAMES J. BREEN

     Counsel to Ven-A-Care
     of the Florida Keys, Inc.


<PAGE>

                            RELATOR DANA R. AUSTIN


By:  /s/ Dana R. Austin             Dated:     1/18/00
     -----------------------               --------------------
     DANA R. AUSTIN


Acknowledged:
- ------------

By:  /s/ Robert L. Vogel            Dated:     1/18/00
     -----------------------               --------------------
     ROBERT L. VOGEL
     Counsel to Dana R. Austin
<PAGE>

                                   EXHIBIT A
                               (Promissory Note)


The Promissory Note dated January 19, 2000 from National Medical Care, Inc. and
Fresenius Medical Care Holdings, Inc. payable to the order of the United States
is incorporated by reference to Exhibit A of Exhibit 10.2 to this Current Report
on Form 8-K.
<PAGE>

                                   EXHIBIT B
          (Amendment to Irrevocable Nontransferable Letter of Credit)

The Amendment to Irrevocable Nontransferable Letter of Credit dated January 19,
2000 issued by the Bank of Nova Scotia, Atlanta Agency to the United States is
incorporated by reference to Exhibit B of Exhibit 10.2 to this Current Report
on Form 8-K.

<PAGE>
                                   EXHIBIT C
                                  (Guarantee)

The Guarantee Agreement dated as of July 31, 1996 among Fresenius Medical Care
GmbH, the predecessor to Fresenius Medical Care AG, National Medical Care, Inc.,
W.R. Grace & Co. and the United States of America, is incorporated by reference
to the Company's Registration Statement on Form S-4 (Registration No. 333-09497)
dated August 2, 1996 and the exhibits thereto.


<PAGE>

                                   EXHIBIT D
                    (List of Fresenius Affiliated Entities)

The List of Fresenius Affiliated Entities is incorporated by reference to
Exhibit D of Exhibit 10.2 to this Current Report on Form 8-K.

<PAGE>

                                                                    EXHIBIT 10.4

                       SETTLEMENT AGREEMENT AND RELEASE
                       --------------------------------

                                  I.  PARTIES
                                      -------

     This Settlement Agreement ("Agreement") is entered by and among:

     A. The United States of America, acting through its Department of Justice
and the United States Attorney's Office for the District of Massachusetts, and
on behalf of the United States Department of Health and Human Services ("HHS")
through its office of Inspector General ("HHS-OIG") (collectively the "United
States"); and  B.  National Medical Care, Inc. ("NMC"), a Delaware corporation
and a wholly owned subsidiary of Fresenius Medical Care Holdings, Inc. including
its Dialysis Services Division ("DSD"); Clinical Diagnostic Systems, Inc.
("CDS"), a Florida corporation and wholly owned subsidiary of NMC; NMC
Diagnostic Services, Inc. ("DSI"), a Delaware corporation and wholly owned
subsidiary of NMC; Bio-Medical Applications Management Company, Inc. ("BMAMC");
NMC's and BMAMC's subsidiary entities that provide dialysis services ("Dialysis
Facilities") including those listed on the attached Exhibit E; and Fresenius
Medical Care Holdings, Inc. ("FMCH")(d/b/a Fresenius Medical Care North
America).

     Collectively, all of the above will be referred to as "the Parties".

                                 II.  PREAMBLE
                                      --------
<PAGE>

     A.   WHEREAS, at all relevant times, NMC primarily was in the business of
providing dialysis and related services to patients with End-Stage Renal Disease
("ESRD") throughout the United States.

     B.   WHEREAS, NMC, CDS, DSI, DSD and the Dialysis Facilities submitted or
caused to be submitted ESRD claims for payment to the Medicare program, Title
XVIII of the Social Security Act, 42 U.S.C. (S)(S) 1395-1395ddd (1997), which is
administered by HHS;

     C.   WHEREAS, the United States contends that it has certain civil claims
against NMC, CDS, DSI, DSD and the Dialysis Facilities, and against FMCH as
parent, for violations of the federal statutes and/or common law doctrines
specified in Paragraph 8 of the Terms and Conditions below, in connection with
the following conduct ("the Covered Conduct"):

     1.   Doppler Flow Test Clinical Study
          ---------------------------------

     a.   Beginning in 1991, NMC, through DSD, planned and carried out a
clinical cohort and intervention study involving color flow doppler ultrasound
examination ("Doppler Flow Tests" or "DFTs") of hemodialysis access sites of
various patients at the Dialysis Facilities. The purpose of the DFT clinical
study included determining if baseline DFTs could be a predictor of access
failure, assessing the interrelationships and effects which hematocrit and EPO
dose have on the probability of access failure given a specified DFT profile,
and determining the correlation of vascular access disease progression. The
results of this study were published in 1998 in the American Journal Of
Nephrology in an article entitled, Predicting Hemodialysis Access
<PAGE>

Failure with Color Flow Doppler Ultrasound. The DFTs involved in this study were
performed during the period approximately July 1991 to April 1994.

     b.   NMC, DSI, CDS, BMAMC, and the Dialysis Facilities submitted or caused
to be submitted claims to the Medicare Program seeking reimbursement for the
technical component of the DFTs performed in the DFT clinical study.  Such
claims/billings were improper because the tests were conducted for research
purposes, and/or were not otherwise reasonable and medically necessary for the
diagnosis or treatment of illness or injury or to improve the functioning of a
malformed body member for the patient(s) for whom the claim was submitted and
the service billed.   In addition, NMC, DSI, CDS, DSD, and the Dialysis
Facilities caused individual physicians to submit claims to Part B of the
Medicare Program seeking reimbursement for the professional or interpretation
component of the DFTs performed in the DFT clinical study.  Such claims/billing
were improper because the underlying technical components were not reimbursable.
<PAGE>

     2.   Bioelectrical Impedance Analysis Test Clinical Study
          ----------------------------------------------------

     a.   From approximately January 1, 1995 through June 30, 1995, NMC through
DSD, carried out Phase II of a clinical study involving bioelectrical impedance
analysis ("BIA") tests. This phase involved providing one or more BIA tests to
various patients at the Dialysis Facilities.  The purpose of this BIA clinical
study was to assess if BIA test results predict mortality and to assess
correlations with other nutritional measurements.

     b.   NMC, DSI, CDS, BMAMC, and the Dialysis Facilities submitted or caused
to be submitted claims to the Medicare Program seeking reimbursement for the
technical component for the BIA tests performed as part of the BIA Clinical
Study.  Such claims/billings were improper because the tests were conducted for
research purposes, and/or were not otherwise reasonable and medically necessary
for the diagnosis or treatment of illness or injury or to improve the
functioning of a malformed body member for the patient for whom the claim was
submitted and the service billed.

               Medical Director Compensation
               -----------------------------

          The United States also contends that it has certain civil claims
against NMC for violations of the federal statutes and/or common law doctrines
enumerated in Paragraph 9 of the Terms and Conditions below, for compensation
paid or offered to physicians for serving as the medical directors of BMA
dialysis facilities, to the extent that this compensation
<PAGE>

reflected services rendered for years through 1994, under contracts entered into
prior to December 31, 1994.

     D.   WHEREAS, the United States also contends that it has certain
administrative claims against CDS, DSI, NMC, DSD, the Dialysis Facilities, and
against FMCH, as parent, under the provisions for permissive exclusion from the
Medicare, Medicaid and other federal health care programs, 42 U.S.C. (S) 1320a-
7(b), and the provisions for civil monetary penalties, 42 U.S.C. (S) 1320a-7a,
for the Covered Conduct.

     E.   WHEREAS, NMC, CDS, DSI, DSD, the Dialysis Facilities, and FMCH
specifically deny and affirmatively contest the contentions of the United States
as set forth in Preamble Paragraph C, above, and specifically deny any
wrongdoing in connection with those claims; and further contend that their
practices described in the Covered Conduct, were appropriate and lawful and did
not result in any violations of federal law, state law, or common law doctrines,
and do not give rise to any civil or administrative cause of action; and

     F.   WHEREAS, in order to avoid the delay, uncertainty, inconvenience and
expense of protracted litigation of these claims, the Parties reach a full and
final compromise of claims that the United States has against NMC, CDS, DSI, DSD
and the Dialysis Facilities and FMCH as parent, for the Covered Conduct,
pursuant to the Terms and Conditions set forth below.

                          III.  TERMS AND CONDITIONS
                                --------------------

     NOW, THEREFORE, in reliance on the representations contained herein and in
consideration of the mutual promises, covenants,
<PAGE>

and obligations in this Agreement, and for good and valuable consideration,
receipt of which is hereby acknowledged, the Parties agree as follows:

     1.   NMC and FMCH, collectively, shall pay to the United States the sum of
two million eight hundred thirty five thousand thirty two dollars ($2,835,032)
("the Settlement Amount"), and this sum shall constitute a debt immediately due
and owing to the United States on the "First Payment Date", which is the later
of the dates on which (a) the four civil Settlement Agreements are fully
executed by the Parties, (b) all notices of dismissal described in the civil
Settlement Agreements are docketed by the Court, or (c) the Court accepts
LIFECHEM, INC.'s, NMC Medical Products, Inc.'s, and NMC Homecare, Inc.'s guilty
pleas and imposes the sentences set forth in their respective Plea Agreements.
NMC and FMCH, collectively, shall pay the Settlement Amount to the United States
according to the schedule, terms and instructions contained in the Promissory
Note executed contemporaneously with this Agreement, attached as Exhibit A, and
incorporated herein by reference.

     2.   As an express condition of the Settlement Agreement, to secure NMC's
and FMCH's payment obligations under Paragraph 1 of this Agreement (and the
other civil Settlement Agreements and criminal Plea Agreements being executed at
the same time), NMC and FMCH shall:

          (a)  procure from the Bank of Nova Scotia and deliver or cause to be
delivered to the United States Attorney's Office for the District of
Massachusetts, on or before January 19, 2000, an
<PAGE>

amendment to the unconditional, irrevocable Letter of Credit No. S020/43695/96
issued to the United States of America on September 27, 1996 (the "Letter of
Credit") to increase the amount of the Letter of Credit to $189,634,446.00. Such
amendment shall be in the form attached as Exhibit B. Within 10 days of receipt
by the U.S. Attorney's Office of written confirmation from the transferring bank
that a quarterly payment or prepayment of such quarterly payments, has been made
to the United States, the United States shall provide written permission to the
Bank of Nova Scotia to reduce the amount available for drawing under Letter of
Credit No. S020/43695/96 by the amount of the principal payment received. In the
event that the entire outstanding payment obligation secured by the Letter of
Credit is prepaid, then the United States shall provide written permission to
reduce the amount available for drawing to zero. The United States shall return
this Letter of Credit for cancellation when all obligations are paid in full or
it is determined, by the United States, or pursuant to a final and non-
appealable order of a court of competent jurisdiction, that NMC and FMCH have
fulfilled all payment obligations pursuant to this Agreement.

          (b)  On January 19, 2000, NMC and FMCH shall establish an escrow
account in an initial amount of $236,401,919.00 to be held by an independent
third party agreeable to the United States, and NMC and FMCH shall increase the
escrow amount each day in an amount of $48,546.00 (through accrued interest
and/or deposits), beginning on January 20, 2000 and continuing through April 15,
2000, when NMC and FMCH shall increase the escrow
<PAGE>

amount by an additional amount each day of $7,271.00 (through accrued interest
and/or deposits), for each quarterly payment due before the first payment is due
on the First Payment Date. On the First Payment Date, all funds in the escrow
account shall be paid to the United States to satisfy the payment obligation in
Paragraph 1. The terms and conditions of this escrow account shall in no way
limit NMC's and FMCH's payment obligations to the United States secured by the
Letter of Credit.

     3.   NMC and FMCH are in default of this Agreement on
the date of occurrence of any of the following events ("Events of Default"):

          a.   NMC's and FMCH's failure to procure, deliver or maintain the
Letter of Credit;

          b.   Failure by NMC's and FMCH's failure to pay any amount provided
for in the Promissory Note attached as Exhibit A within 2 days of when such
payment is due and payable;

          c.   If prior to making the full payment of the amount due under the
Promissory Note or Paragraph 1 above,(i) NMC and/or FMCH commences any case,
proceeding, or other action (A) under any law relating to bankruptcy,
insolvency, reorganization or relief of debtors, seeking to have any order for
relief of debtors, or seeking to adjudicate NMC and/or FMCH as bankrupt or
insolvent, or (B) seeking appointment of a receiver, trustee, custodian or other
similar official for NMC and/or FMCH or for all or any substantial part of NMC's
and/or FMCH's assets; or (ii) there shall be commenced against NMC and/or FMCH
any such case, proceeding or other action referred to in clause (i) which
<PAGE>

results in the entry of an order for relief and any such order remains
undismissed, or undischarged or unbonded for a period of thirty (30) days; or
(iii) NMC and/or FMCH takes any action authorizing, or in furtherance of, or
indicating its consent to, approval of, or acquiescence in, any of the acts set
forth above in this sub-Paragraph 3.c.;

          d.   NMC's and FMCH's failure to establish, maintain or
make the required payments to the escrow account described in Paragraph 2b.

     1.   If payments due under Paragraph 1 are received late, but within the
          two-day grace period provided in Paragraph 5.b. of the Promissory
          Note, interest incurred during such grace period will be assessed at
          two times the daily amount in effect on the date the payment was due.

               5.   NMC and FMCH shall provide the United States written notice
          of an Event of Default within two (2) business days of such event by
          overnight mail, or facsimile followed by overnight delivery, to the
          United States Attorney's Office, District of Massachusetts, One
          Courthouse Way, Suite 9200, Boston, MA 02210, Attention: Suzanne E.
          Durrell, Assistant U.S. Attorney (or to the attention of such other
          person as may be designated in writing by the United States Attorney's
          Office).

               6.   Immediately upon the occurrence of an Event of Default,
<PAGE>

          without further notice or presentment and demand by the United States:

                    a.   The Settlement Amount plus accrued interest through the
          end of the applicable quarter as set forth in Paragraph 1 of the
          Promissory Note (minus any payments to date of principle and accrued
          interest) shall become immediately due and payable ("Settlement
          Default Amount").  Interest shall be calculated on the Settlement
          Default Amount at the Prime Rate as published in the Wall Street
                                                               -----------
          Journal on the Effective Date of this Agreement plus 5% from the date
          -------
          of the Event of Default.

                    b.   In addition, NMC and FMCH will pay the United States
          all reasonable costs of collection and enforcement of this Agreement,
          including attorney's fees and expenses, plus interest described in
          Paragraph 6.a. above. The Settlement Default Amount, plus interest,
          described in Paragraph 6.a. above, together with the costs of
          collection and enforcement described in this sub-paragraph, will be
          referred to as the "Default Obligation".

               7.   Upon the occurrence of an Event of Default, the United
          States may exercise, at its sole option, one or more of the following
          rights:

                    a.   The United States may draw the full amount available
          for drawing under the Letter of Credit and retain all proceeds
          thereof.
<PAGE>

                    b.   The United States may enforce the terms of the
          Guarantee Agreement between the United States of America, Fresenius
          Medical Care GMBH, a German corporation and the predecessor of
          Fresenius Medical Care AG, W.R. Grace & Co., a New York corporation,
          and National Medical Care, Inc., dated July 31, 1996, attached as
          Exhibit C.

                    c.   The United States retains any and all other rights and
          remedies it has or may have under law and equity.

                    d.   No failure or delay on the part of the United
          States to exercise any right or remedy shall operate as a waiver of
          the United States' rights.  No single or partial exercise by the
          United States of any right or remedy shall operate as a waiver of the
          United States' rights.

               8.   In an Event of Default under Paragraph 3.c. above
          (Commencement of Bankruptcy or Reorganization Proceeding):       a.
          NMC and FMCH agree not to contest or oppose any motion filed by the
          United States seeking relief from or modification of the automatic
          stay of 11 U.S.C. (S) 362(a); not to seek relief under 11 U.S.C. (S)
          105 to enjoin or restrain the United States from recovering monies
          owed by NMC and FMCH arising out of this Agreement or the attached
          Promissory Note, or from recovering monies through presentment against
          the
<PAGE>

          Letter of Credit.  NMC and FMCH recognize that this express waiver
          is in consideration for the settlement of claims by the United States
          described in Paragraph C above, under the terms and conditions
          contained in this Settlement Agreement.

                    b.   By expressly waiving the automatic stay provision, NMC
          and FMCH agree not to oppose or interfere with any motion made in
          federal court (including bankruptcy courts) by the United States to
          suspend payments to NMC and DSD from the Title XVIII (Medicare), Title
          XIX (Medicaid) programs, and other federal health care programs;

                    c.   This Agreement shall be voidable at the sole
          option of the United States;

                    d.   If any term(s) of this Agreement are set aside for any
          reason, including as a result of a preference action brought pursuant
          to 11 U.S.C. (S) 547, the United States, at its sole option and in its
          discretion, may rescind all terms of this Agreement and seek recovery
          of the full amount of claims and allegations identified herein and in
          the Civil Actions, or, in the alternative, enforce the remaining terms
          of this Agreement.  In the event of rescission of this Agreement, all
          Parties reserve all rights, claims, and defenses that are available
          under law and equity as of the Effective Date of this Agreement; and
<PAGE>

                    e.   In addition to the rights enumerated in Paragraph 8.a.
          through 8.d. above, the United States and all other Parties shall
          retain all rights and claims they have or may have under law and
          equity.

               9.   Subject to the exceptions and limitations in Paragraph 10
          below, in consideration of the obligations of NMC and FMCH set forth
          in this Agreement, conditioned upon payment in full of the Settlement
          Amount, subject to Paragraph 23 (concerning bankruptcy proceedings
          commenced within 91 days of any payment under this Agreement), the
          United States, on behalf of itself, and its officers, agents,
          agencies, and departments, will release and will be deemed to have
          released FMCH, BMAMC, NMC, DSI, CDS, the Dialysis Facilities and their
          parents, and the affiliates and subsidiaries listed on the attached
          Exhibit D (collectively, the parties described in Preamble Paragraph B
          and the corporate entities listed on Exhibit D constitute the NMC
          Companies within the meaning of this Agreement), and the current
          directors, officers, employees, and agents of the NMC Companies who
          were not employed by or in any way affiliated with DSD, NMC, or NMC's
          parents, subsidiaries, divisions, or affiliates at any time prior to
          September 30, 1996, from any civil or administrative monetary claim
          (including recoupment claims) that the United States
<PAGE>

          has or may have under the False Claims Act, 31 U.S.C. (S)(S) 3729-
          3733; the Program Fraud Civil Remedies Act, 31 U.S.C. (S)(S) 3801-
          3812; the Civil Monetary Penalties Law, 42 U.S.C. (S) 1320a-7a; or
          common law claims for fraud, payment by mistake of fact, breach of
          contract or unjust enrichment for the conduct described in Preamble
          Paragraph C above with respect to Medicare.

               10.  Notwithstanding any term of this Agreement, the United
          States specifically does not release the NMC Companies, or any
          individual from any and all of the following:  (a) any potential
          criminal, civil or administrative claims arising under Title 26, U.S.
          Code (Internal Revenue Code); (b) any criminal liability; (c) any
          potential liability to the United States (or any agencies thereof) for
          any conduct other than that identified in Preamble Paragraph C above;
          (d) any entities not specifically included on
<PAGE>

          the list of NMC entities set forth in Exhibit D; (e) any claims based
          upon such obligations as are created by this Agreement; (f) except as
          explicitly stated in this Agreement, any administrative liability,
          including mandatory exclusion from Federal health care programs; (g)
          any express or implied warranty claims or other claims for defective
          or deficient products and services provided by DSD, DSI, CDS, or the
          Dialysis Facilities including quality of testing or product claims;
          (h) any claims for personal injury or property damage or for other
          consequential damages arising from the conduct described in Paragraph
          C above; (i) any claims based upon failure to deliver items or
          services; (j) any civil or administrative claims against any
          individual who was an officer, director, trustee, agent, employee, or
          was in any way affiliated with CDS, DSI, DSD, NMC, or NMC's parents,
          subsidiaries, divisions, or affiliates at any time prior to September
          30, 1996; or (k) any civil or administrative claims against any
          individual, including current directors, officers, employees and
          agents who receives written notification that he or she is a target of
          the criminal investigation, who is criminally indicted or convicted of
          an offense, or who enters a criminal plea related to the conduct
          alleged in Preamble Paragraph C above.

               11.  FMCH, on behalf of itself and its parents, affiliates,
          subsidiaries, and divisions, including but
<PAGE>

          not limited to NMC, has entered into a Corporate Integrity Agreement
          with HHS-OIG, which is incorporated by reference into this Agreement.
          FMCH will immediately upon execution of this Agreement implement its
          obligations under the Corporate Integrity Agreement.

               12.  In consideration of the obligations of NMC and FMCH set
          forth in this Agreement, conditioned upon payment in full of the
          Settlement Amount, subject to Paragraph 23 below (concerning
          bankruptcy proceedings commenced within 91 days of any payment under
          this Agreement), and conditioned upon FMCH's entering into the
          Corporate Integrity Agreement, the OIG-HHS agrees to release and
          refrain from instituting, directing, or maintaining any administrative
          claim or any action seeking exclusion from the Medicare, Medicaid or
          other Federal health care programs (as defined in 42 U.S.C. (S) 1320a-
          7b(f)) against the NMC Companies and the current directors, officers,
          employees, and agents of the NMC Companies who were not employed by or
          in any way affiliated with CDS, DSI, DSD, the Dialysis Facilities,
          NMC, or any of NMC's parents, subsidiaries, divisions, or affiliates
          at any time prior to September 30, 1996, under 42 U.S.C. (S) 1320a-7a
          (Civil Monetary Penalties Law) or 42 U.S.C. (S) 1320a-7(b) (permissive
          exclusion) for the conduct described in Preamble Paragraph C, except
          as reserved in Paragraph 10 above and as
<PAGE>

          reserved in this Paragraph. The OIG-HHS expressly reserves all rights
          to comply with any statutory obligations to exclude the NMC Companies
          from the Medicare, Medicaid, or other Federal health care programs
          under 42 U.S.C. (S) 1320a-7(a)(mandatory exclusion). Nothing in this
          Paragraph precludes the OIG-HHS from taking action against entities or
          individuals for conduct and practices for which civil claims have been
          reserved in Paragraph 10 above.

               13.  The NMC Companies waive and will not assert any defenses
          these entities may have to any criminal prosecution or administrative
          action relating to the conduct described in Preamble Paragraph C,
          which defenses may be based in whole or in part on a contention that,
          under the Double Jeopardy Clause of the Fifth Amendment of the
          Constitution or Excessive Fines Clause of the Eighth Amendment of the
          Constitution, this Settlement Agreement bars a remedy sought in such
          criminal prosecution or administrative action.  The NMC Companies
          further agree that nothing in this Agreement is punitive in purpose or
          effect.

               14.  The NMC Companies covenant to cooperate fully and
          truthfully with the United States' civil investigation of individuals
          and entities not specifically released in this Agreement.  Upon
          reasonable notice, the NMC Companies will make reasonable efforts to
          facilitate
<PAGE>

          access to, and encourage the cooperation of, its directors, officers,
          and employees for interviews and testimony, consistent with the rights
          and privileges of such individuals, and will furnish to the United
          States, upon reasonable request, all non-privileged documents and
          records in its possession, custody or control.

               15.  On the effective date of this Agreement, the NMC Companies
          release and will be deemed to have released the United States, its
          agencies, employees, servants, and agents from any claims (including
          attorneys fees, costs, and expenses of every kind and however
          denominated) which the NMC Companies have or may have against the
          United States, its agencies, employees, servants, and agents, related
          to or arising from the United States' civil, criminal and
          administrative investigation and prosecution of DSD, DSI, CDS, the
          Dialysis Facilities, NMC and FMCH involving the conduct specified in
          Paragraph C of the Preamble.

               16.  The Settlement Amount that NMC and FMCH must pay pursuant to
          Paragraph 1 of this Agreement will not be decreased as a result of the
          denial of claims for payment now being withheld from payment by any
          Medicare carrier or intermediary, Railroad Retirement Medicare
          carrier, TRICARE, Federal Employees Health Benefits Program ("FEHBP"),
          or Veteran's Administration
<PAGE>

          ("VA"), or any Medicaid payor, related to the conduct described in
          Preamble Paragraph C; and the NMC Companies agree not to resubmit to
          any Medicare carrier or intermediary, Railroad Retirement Medicare
          carrier, TRICARE, FEHBP, VA, or any Medicaid payor any previously
          denied claims related to the conduct described in Preamble Paragraph
          C, and agree not to appeal any such denials of claims.

               17.  The NMC Companies agree that all costs (as defined in the
          Federal Acquisition Regulations ("FAR") (S) 31.205-47 and in Titles
          XVIII and XIX of the Social Security Act, 42 U.S.C. (S)(S) 1395-
          1395ddd (1997) and 1396-1396v(1997), and the regulations promulgated
          thereunder) incurred by or on behalf of the NMC Companies, and their
          divisions, subsidiaries and affiliates, and their present and former
          officers, directors, employees, shareholders and agents in connection
          with:  (a) the matters covered by this Agreement; (b) the Government's
          audits, administrative, civil and criminal investigation and
          prosecution of CDS, DSI, DSD, the Dialysis Facilities, NMC, and FMCH;
          (c) these corporate entities' investigation, defense, and corrective
          actions undertaken in response to the Government's administrative,
          civil and criminal investigations, and in connection with the matters
          covered by this Agreement, and including the obligations undertaken
          pursuant to the Corporate
<PAGE>

          Integrity Agreement (including attorney's fees); (d) the negotiation
          and performance of this Agreement, and the Corporate Integrity
          Agreement; and (e) the payments made to the United States provided for
          in this Agreement, are unallowable costs on Government contracts and
          under Medicare, Railroad Retirement Medicare, Medicaid, TRICARE,
          FEHBP, and the VA programs (hereafter, "unallowable costs"). These
          unallowable costs will be separately estimated and accounted for by
          the NMC Companies and these entities will not charge such unallowable
          costs directly or indirectly to any contracts with the United States
          or any Medicaid program, or seek payment for such unallowable costs
          through any cost report, cost statement, information statement or
          payment request submitted by the NMC Companies or any of their
          divisions, subsidiaries or affiliates to the Medicare, Railroad
          Retirement Medicare, Medicaid, TRICARE, VA or FEHBP programs.

               The NMC Companies further agree that within 270 days of the
          effective date of this Agreement these entities will identify to
          applicable Medicare, Railroad Retirement Medicare, and TRICARE fiscal
          intermediaries, carriers and/or contractors, and Medicaid, VA and
          FEHBP fiscal agents, any unallowable costs (as defined above) included
          in payments previously sought from the United States, or any Medicaid
          Program, including, but not limited to, payments sought in any cost
          reports, cost
<PAGE>

          statements, information reports, or payment requests already submitted
          by the NMC Companies or any of their subsidiaries, affiliates, or
          divisions and will request, and agree, that such cost reports, cost
          statements, information reports or payment requests, even if already
          settled, be adjusted to account for the effect of the inclusion of the
          unallowable costs. The NMC Companies agree that the United States will
          be entitled to recoup from the NMC Companies any overpayment as a
          result of the inclusion of such unallowable costs on previously-
          submitted cost reports, information reports, cost statements or
          requests for payment. Any payments due after the adjustments have been
          made shall be paid to the United States pursuant to the direction of
          the Department of Justice, and/or the affected agencies. The United
          States reserves its rights to disagree with any calculations submitted
          by the NMC Companies, or any of their subsidiaries, affiliates or
          divisions, on the effect of inclusion of unallowable costs (as defined
          above) on the NMC Companies or any of their subsidiaries, affiliates
          or divisions' cost reports, cost statements or information reports.
          Nothing in this Agreement shall constitute a waiver of the rights of
          the United States to examine or reexamine the unallowable costs
          described above.

               18.  This Agreement is intended to be for the benefit of the
          Parties only, and by this instrument the
<PAGE>

          Parties do not release any claims against any other person or entity
          except as specifically identified in Paragraphs 9 and 11, above.

               19.  The NMC Companies agree that they will not seek payment for
          any of the health care billings covered by this Agreement from any
          health care beneficiaries or their parents, sponsors, estates, heirs,
          successors or assigns.  The NMC Companies waive any causes of action
          against these beneficiaries or their parents, sponsors, estates,
          heirs, successors, or assigns based upon the claims for payment
          covered by this Agreement.

               20.  Nothing in this Agreement constitutes an agreement by the
          United States concerning the characterization of the amounts paid
          hereunder for purposes of any proceeding under Title 26 of the
          Internal Revenue Code.

               21.  Except as provided in Paragraph 6, each party to this
          Agreement will bear its own legal and other costs incurred in
          connection with this matter, including by way of example only, all
          costs incurred in the investigation and defense of this matter, the
          preparation and performance of this Agreement, and all corrective
          actions taken in response to the investigation and resolution of this
          matter.

               22.  NMC and FMCH expressly warrant that they have reviewed their
          financial condition and that they
<PAGE>

          currently are solvent on a consolidated basis within the meaning of 11
          U.S.C. Section 547(b)(3), and expect to remain solvent on a
          consolidated basis following payment to the United States hereunder.
          Further, the Parties expressly warrant that, in evaluating whether to
          execute this Agreement, the Parties (a) have intended that the mutual
          promises, covenants and obligations set forth herein constitute a
          contemporaneous exchange for new value given to NMC and FMCH within
          the meaning of 11 U.S.C. Section 547(c)(1), and (b) have concluded
          that these mutual promises, covenants, and obligations do, in fact,
          constitute such a contemporaneous exchange.

               23.  In the event NMC or FMCH commences, or a third party
          commences, within 91 days of any payment under of this Agreement, any
          case, proceeding, or other action (i) under any law relating to
          bankruptcy, insolvency, reorganization or relief of debtors, seeking
          to have any order for relief of NMC and/or FMCH's debts, or seeking to
          adjudicate NMC and/or FMCH as bankrupt or insolvent, or (ii) seeking
          appointment of a receiver, trustee, custodian or other similar
          official for NMC and/or FMCH or for all or any substantial part of NMC
          and/or FMCH's assets, NMC and FMCH agree as follows:

                    a.   NMC and FMCH's obligations under this Agreement may
          not be avoided pursuant to 11 U.S.C.
<PAGE>

          Section 547, and NMC and FMCH will not argue or otherwise take the
          position in any such case, proceeding or action that: (i) NMC and/or
          FMCH's obligations under this Agreement may be avoided under 11 U.S.C.
          Section 547; (ii) NMC and FMCH were insolvent on a consolidated basis
          at the time this Agreement was entered into, or became insolvent on a
          consolidated basis as a result of the payment made to the United
          States hereunder; or (iii) the mutual promises, covenants and
          obligations set forth in this Agreement do not constitute a
          contemporaneous exchange for new value given to NMC and/or FMCH.

                    b.   In the event that NMC and/or FMCH's obligations
          hereunder are avoided pursuant to 11 U.S.C. Section 547, the United
          States, at its sole option, may rescind the releases in this
          Agreement, and bring any civil and/or administrative claim, action or
          proceeding against NMC, CDS, DSI, DSD, the Dialysis Facilities, and
          the NMC Companies and/or FMCH for the claims that would otherwise be
          covered by the releases provided in Paragraphs 9 and 11 above.  If the
          United States chooses to do so, CDS, DSI, DSD, the Dialysis
          Facilities, NMC and FMCH agree that (i) any such claims, actions or
          proceedings brought by the United States (including any proceedings to
          exclude any of the NMC Companies from participation in Medicare,
          Medicaid, or other federal health care programs) are not subject
<PAGE>

          to an "automatic stay" pursuant to 11 U.S.C. Section 362(a) as a
          result of the action, case or proceeding described in the first clause
          of this Paragraph, and that CDS, DSI, DSD, the Dialysis Facilities,
          NMC and FMCH will not argue or otherwise contend that the United
          States' claims, actions or proceedings are subject to an automatic
          stay; (ii) that CDS, DSI, DSD, the Dialysis Facilities, NMC and FMCH
          will not plead, argue or otherwise raise any defenses under the
          theories of statute of limitations, laches, estoppel or similar
          theories, to any such civil or administrative claims, actions or
          proceeding which are brought by the United States within 90 calendar
          days of written notification to NMC and FMCH that the releases herein
          have been rescinded pursuant to this Paragraph, and (iii) the United
          States has a valid claim against CDS, DSI, DSD, the Dialysis
          Facilities, NMC and FMCH in the amount of the Default Obligation and
          the United States may pursue its claims in any case, action, or
          proceeding.

                    c.   CDS, DSI, DSD, the Dialysis Facilities, NMC and FMCH
          acknowledge that their agreements in this Paragraph are provided in
          exchange for valuable consideration provided in this Agreement.

               24.  CDS, DSI, DSD, the Dialysis Facilities, NMC and FMCH
          represent that this Agreement is freely and
<PAGE>

          voluntarily entered into without any degree of duress or compulsion
          whatsoever.

               25.  This Agreement is governed by the laws of the United
          States.  The Parties agree that the exclusive jurisdiction and venue
          for any disputes arising between and among the Parties under this
          Agreement will be the United States District Court for the District of
          Massachusetts, except that disputes arising under the Corporate
          Integrity Agreement shall be resolved exclusively upon the dispute
          resolution provisions set forth in the Corporate Integrity Agreement.

               26.  The undersigned CDS, DSI, DSD, the Dialysis Facilities, NMC
          and FMCH signatories represent and warrant that they are authorized by
          their respective Board of Directors to execute this Agreement.  The
          undersigned United States signatories represent that they are signing
          this Agreement in their respective official capacities and that they
          are authorized to execute this Agreement.

               27.  Except for the representations in Paragraph 21 (regarding
          solvency), and Paragraph 23 (concerning bankruptcy proceedings
          commenced within 91 days of any payments under this Agreement), the
          Parties agree that nothing in this Agreement constitutes an admission
          by any person or entity with respect to any issue of law or fact.
<PAGE>

               28.  This Agreement is effective on the date of signature of the
          last signatory to the Agreement (the "Effective Date").

               29.  This Agreement shall be binding on all successors,
          transferees, heirs and assigns.

               30.  This Agreement, together with Exhibits A through E,  and
          the Corporate Integrity Agreement, constitute the complete agreement
          among the Parties with regard to the conduct described in Preamble
          Paragraph C.  This Agreement may not be amended except by written
          consent of the Parties, except that only FMCH and OIG-HHS must agree
          in writing to modification of the Corporate Integrity Agreement.

               31.  This Agreement may be executed in counterparts, each of
          which shall constitute an original and all of which shall constitute
          one and the same Agreement.
<PAGE>

                         THE UNITED STATES OF AMERICA
                         ----------------------------


          By:  /s/ Suzanne E. Durrell             Dated:  January 18, 2000
               --------------------------                 ----------------
               SUZANNE E. DURRELL
               Assistant U.S. Attorney
               District of Massachusetts

          By:  /s/ Patricia M. Connolly           Dated:  January 18, 2000
               --------------------------                 ----------------
               PATRICIA M. CONNOLLY
               Special Assistant U.S. Attorney
               District of Massachusetts

          By:  /s/ Maya Guerra                    Dated:  January 18, 2000
               --------------------------                 ----------------
               MAYA GUERRA
               Trial Attorney
               Civil Division
               U.S. Department of Justice

          By:  /s/ Lewis Morris                   Dated:      1/18/00
               --------------------------                 ------------------
               LEWIS MORRIS
               Assistant Inspector General
               Office of Inspector General
               U.S. Department of Health and
                    Human Services
<PAGE>

                      CLINICAL DIAGNOSTIC SYSTEMS, INC.,
                        NMC DIAGNOSTIC SERVICES, INC.,
               Bio-Medical Applications Management Company, Inc.
                          NATIONAL MEDICAL CARE, INC.
                     FRESENIUS MEDICAL CARE HOLDINGS, INC.


          By:  /s/ Ben J. Lipps                   Dated:    1/18/00
               ------------------------                  --------------------
               Ben J. Lipps
               President
               Clinical Diagnostic Systems, Inc.

          By:  /s/ Ben J. Lipps                   Dated:    1/18/00
               ------------------------                  --------------------
               Ben J. Lipps
               President
               NMC Diagnostic Services, Inc.

          By:  /s/ Ben J. Lipps                   Dated:    1/18/00
               ------------------------                  --------------------
               Ben J. Lipps
               President
               Bio-Medical Applications Management Company, Inc.

          By:  /s/ Ben J. Lipps                   Dated:    1/18/00
               ------------------------                   --------------------
               Ben J. Lipps
               President
               National Medical Care, Inc.

          By:  /s/ Ben J. Lipps                   Dated:    1/18/00
               ------------------------                   --------------------
               Ben J. Lipps
               President
               Fresenius Medical Care Holdings, Inc.
<PAGE>

          Acknowledged:
          -------------

          By: /s/ Jonathan E. Chiel       Dated: January 18, 2000
             --------------------------         -------------------
               JONATHAN CHIEL
               Counsel to Clinical Diagnostic
               Systems, Inc., NMC BMA Management Co.,
               NMC Diagnostic Services, Inc.
               National Medical Care, Inc.
               Fresenius Medical Care Holdings, Inc.

          By: /s/ Alan E. Reider          Dated: 1/18/00
             --------------------------         -------------------
               ALAN E. REIDER
               Counsel to Clinical Diagnostic
               Systems, Inc., NMC Diagnostic
               Services, Inc., NMC BMA Management Co.,
               National Medical Care, Inc.
               Fresenius Medical Care Holdings, Inc.

<PAGE>

                                   EXHIBIT A
                               (Promissory Note)

The Promissory Note dated January 19, 2000 from National Medical Care, Inc. and
Fresenius Medical Care Holdings, Inc. payable to the order of the United States
is incorporated by reference to Exhibit A of Exhibit 10.2 to this Current Report
on Form 8-K.


<PAGE>

                                   EXHIBIT B
          (Amendment to Irrevocable Nontransferable Letter of Credit)

The Amendment to Irrevocable Nontransferable Letter of Credit dated January 19,
2000 issued by the Bank of Nova Scotia, Atlanta Agency to the United States is
incorporated by reference to Exhibit B of Exhibit 10.2 to this Current Report
on Form 8-K.
<PAGE>
                                   EXHIBIT C
                                  (Guarantee)

The Guarantee Agreement dated as of July 31, 1996 among Fresenius Medical Care
GmbH, the predecessor of Fresenius Medical Care AG, National Medical Care, Inc.,
W.R. Grace & Co. and the United States of America, is incorporated by reference
to the Company's Registration Statement on Form S-4 (Registration No. 333-09497)
dated August 2, 1996 and the exhibits thereto.


<PAGE>

                                   EXHIBIT D
                    (List of Fresenius Affiliated Entities)

The List of Fresenius Affiliated Entities is incorporated by reference to
Exhibit D of Exhibit 10.2 to this Current Report on Form 8-K.
<PAGE>

                                   EXHIBIT E

<TABLE>
<CAPTION>
                          FACILITIES IN BIA STUDY

LOCATION          CORPORATE NAME                                          FACILITY
<C>               <S>                                                     <C>
1629              BIO-MEDICAL APPLICATIONS OF MA.,INC.                    WALTHAM
1110              BIO-MEDICAL APPLICATIONS OF MA.,INC.                    BOSTON - TKC
1109              BIO-MEDICAL APPLICATIONS OF MA.,INC.                    FRAMINGHAM
1654              BIO-MEDICAL APPLICATIONS OF NORTH CAROLINA, INC.        SMITHFIELD
1656              BIO-MEDICAL APPLICATIONS OF NORTH CAROLINA, INC.        ROANOKE RAPIDS
1688              BIO-MEDICAL APPLICATIONS OF NORTH CAROLINA, INC.        CLINTON
1498              BIO-MEDICAL APPLICATIONS OF NORTH CAROLINA, INC.        ROCKY MOUNT
1653              BIO-MEDICAL APPLICATIONS OF NORTH CAROLINA, INC.        RALEIGH
1358              BIO-MEDICAL APPLICATIONS OF NORTH CAROLINA, INC.        KINSTON
1652              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          PARKVIEW
1087              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          HARRISBURG
1380              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          NW PHILADELPHIA
1176              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          GREENSBURG
1175              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          PITTSBURGH
1122              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          SW PENN
1726              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          MOUNT PLEASANT
1683              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          UNIONTOWN
1209              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          HAZELTON
1123              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          POTTSVILLE
1395              BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.          FAIRMOUNT
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
                              FACILITIES IN DFT COHORT STUDY

LOCATION           CORPORATE NAME                                         FACILITY NAME
<C>                <S>                                                    <C>
1605               BIO-MEDICAL APPLICATIONS OF MICHIGAN, INC.             ADRIAN
1273               BIO-MEDICAL APPLICATIONS OF OHIO, INC.                 AKRON
1481               BIO-MEDICAL APPLICATIONS OF INDIANA, INC.              ANDERSON
1253               BIO-MEDICAL APPLICATIONS OF MICHIGAN, INC.             ANN ARBOR
1181               BIO-MEDICAL APPLICATIONS OF MARYLAND, INC.             ANNAPOLIS
1277               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             ARLINGTON
1178               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         BUTLER
1356               BIO-MEDICAL APPLICATIONS OF MARYLAND, INC.             CAMP SPRINGS
1112               BIO-MEDICAL APPLICATIONS OF MA.,INC.                   CAPE COD
1272               BIO-MEDICAL APPLICATIONS OF OHIO, INC.                 CENTRAL OHIO \ COLUMBUS
1639               BIO-MEDICAL APPLICATIONS OF OHIO, INC.                 CENTRAL OHIO EAST
1389               BIO-MEDICAL APPLICATIONS OF MA.,INC.                   CHICOPEE
1224               BIO-MEDICAL APPLICATIONS OF FLORIDA, INC.              DELTONA
1265               BIO-MEDICAL APPLICATIONS OF MICHIGAN, INC.             DETROIT
1119               BIO-MEDICAL APPLICATIONS OF DC, INC.                   DUPONT CIRCLE
1441               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             EASTERN VIRGINIA
1682               BIO-MEDICAL APPLICATIONS OF WEST VIRGINIA, INC.        ELKINS
1667               BIO-MEDICAL APPLICATIONS OF MICHIGAN, INC.             FLINT
1433               BIO-MEDICAL APPLICATIONS OF OHIO, INC.                 GRANT PARK
1176               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         GREENSBURG
1300               BIO-MEDICAL APPLICATIONS OF INDIANA, INC.              INDIANAPOLIS
1298               BIO-MEDICAL APPLICATIONS OF JERSEY CITY, INC.          JERSEY CITY
1418               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         KITTANNING
1625               BIO-MEDICAL APPLICATIONS OF MARYLAND, INC.             LA PLATA
1108               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         LATROBE
1354               BIO-MEDICAL APPLICATIONS OF MARYLAND, INC.             LAUREL
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                              FACILITIES IN DFT COHORT STUDY

LOCATION           CORPORATE NAME                                         FACILITY NAME
<C>                <S>                                                    <C>
1355               BIO-MEDICAL APPLICATIONS OF MARYLAND, INC.             LEONARDTOWN
1263               BIO-MEDICAL APPLICATIONS OF MICHIGAN, INC.             LIVONIA
1250               BIO-MEDICAL APPLICATIONS OF KENTUCKY, INC.             LOUISVILLE
1487               BIO-MEDICAL APPLICATIONS OF MANCHESTER, INC.           MANCHESTER
1262               BIO-MEDICAL APPLICATIONS OF OHIO, INC.                 MANSFIELD
1362               BIO-MEDICAL APPLICATIONS OF INDIANA, INC.              MARION COUNTY
1606               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         MON VALLEY
1680               BIO-MEDICAL APPLICATIONS OF WEST VIRGINIA, INC.        MORGANTOWN
1417               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         NEW CASTLE
1450               BIO-MEDICAL APPLICATIONS  OF NEW HAMPSHIRE, INC.       NEW HAMPSHIRE
1361               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             NEW RIVER VALLEY
1397               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             NORTH ROANOKE
1466               BIO-MEDICAL APPLICATIONS OF NORTHEAST DC, INC.         NORTHEAST D.C.
1132               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             NORTHERN VIRGINIA AT ALEXANDRIA
1663               BIO-MEDICAL APPLICATIONS OF MICHIGAN, INC.             OWOSSO
1175               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         PITTSBURGH
1170               BIO-MEDICAL APPLICATIONS OF RHODE ISLAND, INC.         PROVIDENCE
1106               BIO-MEDICAL APPLICATIONS OF NEW YORK, INC.             QUEENS
1601               ROCKWOOD DIALYSIS CENTER, INC.                         RICHMOND
1133               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             ROANOKE
1340               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             SMYTH COUNTY
1480               BIO-MEDICAL APPLICATIONS OF KENTUCKY, INC.             SOMERSET
1324               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         SOUTH HILLS
1635               BIO-MEDICAL APPLICATIONS OF KENTUCKY, INC.             SOUTH LOUISVILLE
1377               BIO-MEDICAL APPLICATIONS OF SOUTH QUEENS, INC.         SOUTH QUEENS
1633               BIO-MEDICAL APPLICATIONS OF OHIO, INC.                 SOUTH SUMMIT
1434               BIO-MEDICAL APPLICATIONS OF INDIANA, INC.              SOUTHERN INDIANA
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                              FACILITIES IN DFT COHORT STUDY

LOCATION           CORPORATE NAME                                         FACILITY NAME
<C>                <S>                                                    <C>
1122               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         SOUTHWESTERN PENN.
1111               BIO-MEDICAL APPLICATIONS OF MA., INC.                  SPRINGFIELD
1488               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             STERLING
1195               BIO-MEDICAL APPLICATIONS OF VIRGINIA, INC.             SUFFOLK
1604               TAPPAHANNOCK DIALYSIS CENTER, INC.                     TAPPAHANNOCK
1386               BIO-MEDICAL APPLICATIONS OF PENNSYLVANIA, INC.         THREE RIVERS
1602               WEST END DIALYSIS CENTER, INC.                         WEST END
1490               BIO-MEDICAL APPLICATIONS OF KENTUCKY, INC.             WEST LOUISVILLE
1307               BIO-MEDICAL APPLICATIONS OF WOONSOCKET, INC.           WOONSOCKET
</TABLE>

<PAGE>

                                                                    EXHIBIT 10.5


                        SETTLEMENT AGREEMENT AND RELEASE
                        -------------------- -----------

                                  I.  PARTIES
                                      -------
     This Settlement Agreement ("Agreement") is entered by and among:

     A. The United States of America, acting through its Department of Justice
and the United States Attorneys' Offices for the Districts of Massachusetts and
the Southern District of Florida, and on behalf of (1) the United States
Department of Health and Human Services through its Office of Inspector
General("HHS-OIG"); (2) the United States Department of Defense through its
TRICARE Support Office ("TSO") (formerly the Office of the Civilian Health and
Medical Program of the Uniformed Services), a field activity of the Office of
the Secretary of Defense, through counsel; (3) the United States Office of
Personnel Management ("OPM"), through the Director of Programs; and (4) the
United States Department of Veteran Affairs ("VA"), through counsel;
(collectively the preceding will be referred to as the "United States");

     B. National Medical Care, Inc. ("NMC"), a Delaware corporation, and its
affiliate entities listed on Exhibit E hereto that provide or have provided
dialysis services (jointly and severally "DSD"); and Fresenius Medical Care
Holdings, Inc. ("FMCH") (d/b/a Fresenius Medical Care North America); and
<PAGE>

     C.  Gregory S. Price ("Price"), individually, and Richard Bradford
("Bradford"), individually, (collectively the "Relators"), each acting through
his authorized representative.
Collectively, all of the above will be referred to as "the Parties."

                                 II.  PREAMBLE
                                      --------

     A.  WHEREAS, at all relevant times, NMC primarily was in the business of
providing dialysis and related services to patients with End-Stage Renal Disease
("ESRD") throughout the United States.

     B.  WHEREAS, DSD submitted or caused to be submitted ESRD claims for
payment for dialysis, patient care, and related goods and services to the
Medicare program, Title XVIII of the Social Security Act, 42 U.S.C. (S)(S) 1395-
1395ddd (1997), which is administered by HHS;

     C.  WHEREAS, DSD submitted or caused to be submitted ESRD claims for
payment for dialysis, patient care, and related goods and services to the
TRICARE Program (also known as the Civilian Health and Medical Program of the
Uniformed Services ("CHAMPUS")), 10 U.S.C. (S)(S) 1071-1106, which is
administered by the Department of Defense through the TSO;

     D.  WHEREAS, DSD submitted or caused to be submitted ESRD claims for
payment for dialysis, patient care, and related goods and services to the
Federal Employees Health Benefit Program ("FEHBP"), 5 U.S.C. (S)(S) 8901-8914,
which is administered by OPM;

     E.  WHEREAS, DSD submitted or caused to be submitted ESRD claims for
payment for dialysis, patient care, and related goods
<PAGE>

and services to the Railroad Retirement Medicare program ("Railroad Medicare"),
established under the Railroad Retirement Act of 1974, 45 U.S.C. (S)(S) 231-
231v, which is paid from the Medicare Trust Fund, and administered by the United
States Railroad Retirement Board ("RRB");

     F.  WHEREAS, DSD submitted or caused to be submitted ESRD claims for
payment for dialysis, patient care, and related goods and services to the
Veteran Affairs Program, 38 U.S.C. (S)(S) 1701-1743, which is administered by
the VA;

     G.  WHEREAS, DSD submitted or caused to be submitted ESRD claims for
payment for dialysis, patient care, and related goods and services to the
Medicaid programs, 42 U.S.C. (S)(S) 1396-1396v (1997), of the thirty-three
states of Alabama, Arizona, Arkansas, California, Connecticut, Colorado,
Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Maine, Maryland,
Massachusetts, Michigan, Mississippi, Missouri, New Hampshire, New Jersey, New
Mexico, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode Island,
South Carolina, Tennessee, Texas, Virginia, West Virginia, Wisconsin, and the
District of Columbia, (the "Participating States"), and to the Territory of
Puerto Rico (the "Participating Territory");

     H.  WHEREAS, the United States contends that it has certain civil claims
against DSD and NMC, and against FMCH, as parent, for violations of the federal
statutes and/or common law doctrines, specified in Paragraph 10 below in
connection with the following conduct ("the Covered Conduct"):
<PAGE>

     (1) Failing to refund to HCFA or its fiscal intermediaries, overpayments
(hereinafter "Unreconciled Payments") received by DSD from Medicare that DSD
reported as Unreconciled Payments on HCFA Forms 838;

     (2) Failing to report on HCFA Forms 838 filed or caused to be filed by DSD
from 1991 to the present, Unreconciled Payments it had received from the
Medicare program, and recognized as income during the period 1975-1993;

     (3) In connection with amendments to the Medicare Secondary Payor
provisions made by the Omnibus Budget Reconciliation Act ("OBRA") of 1993 ("OBRA
`93"), failing to report to HCFA or its fiscal intermediaries on HCFA Forms 838
Unreconciled Payments at the time of billing to employer group health plans and
otherwise failing to report in a timely fashion to HCFA or its fiscal
intermediaries.

     (4) Failing to report and/or refund to HCFA or its fiscal intermediaries
overpayments that Home Dialysis Services, Inc. ("HDS"), a company established by
NMC, had received from the Medicare program resulting from its billing of home
dialysis services and equipment in excess of the Method II home dialysis cost
cap contained in OBRA `89;

     (5) Failing to report and/or refund to HCFA and its fiscal intermediaries
overpayments received by HDS from the Medicare program resulting from its
billing in excess of the reasonable charge for home dialysis prior to OBRA `89;
<PAGE>

          (6) Failing to report and/or refund to the Participating States and
Territory Medicaid programs overpayments received during the years 1975-1993;
          (7) Failing to report and/or refund to TRICARE overpayments received
during the years 1975-1993;
          (8) Failing to report and/or refund to FEHPB overpayments received
during the years 1975-1993; and
          (9) Failing to report and/or refund to the VA overpayments received
during the years 1975-1993.

     I.     WHEREAS, the United States also contends that it has certain
administrative claims against DSD and FMCH, as parent, under the provisions for
permissive exclusion from the Medicare, Medicaid and other federal health care
programs, 42 U.S.C. (S) 1320a-7(b), and the provisions for civil monetary
penalties, 42 U.S.C. (S) 1320a-7a, for the Covered Conduct.

     J.     WHEREAS, Relator Gregory S. Price has filed under seal a qui tam
                                                                     --- ---
complaint on behalf of the United States: United States ex rel. Price v. W.R.
                                          -----------------------------------
Grace & Co., National Medical Care, Inc., et al., Civil Action No. 97-11022-NG
- ------------------------------------------------
(D. Mass.)(the "Price Civil Action").

     K.     WHEREAS, Relator Richard Bradford has filed under seal a qui tam
                                                                     --- ---
complaint on behalf of the United States: United States ex rel. Bradford v.
                                          ---------------------------------
National Medical Care, Inc., et al., Civil Action No. 96-3350-Hoeveler (S.D.
- ----------------------------------
Fla.)(the "Bradford Civil Action").

     L.     WHEREAS, DSD, and FMCH specifically deny and affirmatively contest
the contentions of the United States as set
<PAGE>

forth in Paragraph H, above, and the allegations of the Relators in the Price
                                                                        -----
and Bradford Civil Actions, and specifically deny any wrongdoing in connection
    --------
with those claims; and further contend that DSD's practices described in the
Covered Conduct were appropriate and lawful and did not result in any violations
of federal law, state law, or common law doctrines, and do not give rise to any
civil or administrative cause of action; and

     M.    WHEREAS, over the years, DSD reported Medicare Unreconciled Payments
on HCFA Forms 838 through the quarter ended December 31, 1998, of which NMC and
FMCH warrant and represent on Exhibit E attached hereto and incorporated herein
by reference, that $10,982,885.16 million has not yet been recouped by the
fiscal intermediaries as of January 3, 2000 and remains outstanding ("Unrecouped
Credit Balances"); and

     N.    WHEREAS, in order to avoid the delay, uncertainty, inconvenience and
expense of protracted litigation of these claims and contentions of the Parties,
the Parties reach a full and final compromise for the Covered Conduct, pursuant
to the Terms and Conditions set forth below.

                           III.  TERMS AND CONDITIONS
                                 --------------------

     NOW, THEREFORE, in reliance on the representations contained herein and in
consideration of the mutual promises, covenants, and obligations in this
Agreement, and for good and valuable consideration, receipt of which is hereby
acknowledged, the Parties agree as follows:
<PAGE>

     1.  NMC and FMCH, collectively, shall pay to the United States and the
Participating States and Participating Territory, collectively, the sum of
sixteen million eight hundred seventeen thousand seven hundred eight dollars
($16,817,708) (the "Settlement Amount"), and this sum shall constitute a debt
immediately due and owing to the United States on the "First Payment Date",
which is the later of the dates on which (a) the four civil Settlement
Agreements are fully executed by the Parties, (b) all notices of dismissal
described in the civil Settlement Agreements are docketed by the Court, or (c)
the Court accepts LIFECHEM, INC.'s, NMC Medical Products, Inc.'s, and NMC
Homecare, Inc.'s guilty pleas and imposes the sentences set forth in their
respective Plea Agreements.  NMC and FMCH, collectively, shall pay the
Settlement Amount to the United States according to the schedule, terms and
instructions contained in the Promissory Note executed contemporaneously with
this Agreement, attached as Exhibit A, and incorporated herein by reference.
Within a reasonable amount of time after receipt of the first payment from NMC
and FMCH pursuant to the terms of the Promissory Note, the United States shall
pay to (a) the Participating States, collectively, according to written payment
instructions from the Participating States, an amount of seven hundred fifty
four thousand one hundred twenty-five dollars ($754,125) as their share of the
Settlement Amount and (b) the Participating Territory, according to written
payment instructions from the Participating Territory, an amount of sixty
thousand one hundred
<PAGE>

fifty-five dollars ($60,155) as its share of the Settlement Amount.

     2.  As an express condition of the Settlement Agreement, to secure NMC's
and FMCH's payment obligations under Paragraph 1 of this Agreement (and the
other civil Settlement Agreements and criminal Plea Agreements being executed at
the same time), NMC and FMCH shall:

     (a) procure from the Bank of Nova Scotia and deliver or cause to be
delivered to the United States Attorney's Office for the District of
Massachusetts, on or before January 19, 2000, an amendment to the unconditional,
irrevocable Letter of Credit No. S020/43695/96 issued to the United States of
America on September 27, 1996 (the "Letter of Credit") to increase the amount of
the Letter of Credit to $189,634,446.00.  Such amendment shall be in the form
attached as Exhibit B.  Within 10 days of receipt by the U.S. Attorney's Office
of written confirmation from the transferring bank that a quarterly payment, as
described in Paragraphs 1.B. through 1.E. of the Promissory Note, or prepayment
of such quarterly payments, has been made to the United States, the United
States shall provide written permission to the Bank of Nova Scotia to reduce the
amount available for drawing under Letter of Credit No. S020/43695/96 by the
amount of the principal payment received.  In the event that the entire
outstanding payment obligation secured by the Letter of Credit is prepaid, then
the United States shall provide written permission to reduce the amount
available for drawing to zero.  The United States shall return this Letter of
Credit for cancellation when
<PAGE>

all obligations are paid in full or it is determined, by the United States, or
pursuant to a final and non-appealable order of a court of competent
jurisdiction, that NMC and FMCH have fulfilled all payment obligations pursuant
to this Agreement.

     (b) On January 19, 2000, NMC and FMCH shall establish an escrow account in
an initial amount of $236,401,919.00 to be held by an independent third party
agreeable to the United States, and NMC and FMCH shall increase the escrow
amount each day in an amount of $48,546.00 (through accrued interest and/or
deposits), beginning on January 20, 2000 and continuing through April 15, 2000,
when NMC and FMCH shall increase the escrow amount by an additional amount each
day of $7,271.00 (through accrued interest and/or deposits), for each quarterly
payment due before the first payment is due on the First Payment Date.  On the
First Payment Date, all funds in the escrow account shall be paid to the United
States to satisfy the payment obligation in Paragraph 1.  The terms and
conditions of this escrow account shall in no way limit NMC's and FMCH's payment
obligations to the United States secured by the Letter of Credit.

     3.  NMC and FMCH, collectively, agree to pay to the Health Care Financing
Administration ("HCFA") the Unrecouped Credit Balances, and this sum shall
constitute a debt immediately due and owing to the United States upon the later
of the date on which (a) this Agreement is fully executed by the Parties, or (b)
the notices of dismissal described in Paragraph 18 of this Agreement are filed
and docketed by the Court.  NMC and FMCH shall pay the Unrecouped Credit
Balances in accordance with
<PAGE>

written payment instructions to be provided by the United States Attorneys's
Office for the District of Massachusetts. HCFA shall direct its fiscal
intermediaries identified in Exhibit E, in writing, that they should cease any
efforts to recoup the Unrecouped Credit Balances received by DSD prior to
January 1, 1999 and reported by DSD on Forms 838. NMC and FMCH shall provide
HCFA with any additional documentation necessary to this process. In the event
that HCFA or any fiscal intermediary initiates a recoupment contrary to such
directions, NMC and FMCH shall notify Dara Corrigan, Associate General Counsel
of HCFA, and HCFA shall instruct the fiscal intermediary to suspend the
recoupment.

     4.  NMC and FMCH are in default of this Agreement on
the date of occurrence of any of the following events ("Events of Default"):

          a.  NMC's and FMCH's failure to procure, deliver or maintain the
Letter of Credit;

          b.  NMC's and FMCH's failure to pay any amount provided for in the
Promissory Note attached as Exhibit A within two days of when such payment is
due and payable;

          1.   NMC's and FMCH's failure to pay the Unreconciled
               Credit Balances as provided for in Paragraph 3 above;

                         d.  If prior to making the full payment of the amount
               due under the Promissory Note or Paragraph 3 above,(i) NMC and/or
               FMCH commences any case, proceeding, or other action (A) under

<PAGE>

               relief of debtors, seeking to have any order for relief of
               debtors, or seeking to adjudicate NMC and/or FMCH as bankrupt or
               insolvent, or (B) seeking appointment of a receiver, trustee,
               custodian or other similar official for NMC and/or FMCH or for
               all or any substantial part of NMC's and/or FMCH's assets; or
               (ii) there shall be commenced against NMC and/or FMCH any such
               case, proceeding or other action referred to in clause (i) which
               results in the entry of an order for relief and any such order
               remains undismissed, or undischarged or unbonded for a period of
               thirty (30) days; or (iii) NMC and/or FMCH takes any action
               authorizing, or in furtherance of, or indicating its consent to,
               approval of, or acquiescence in, any of the acts set forth above
               in this sub-Paragraph 4.d.;

          2.   Failure by NMC and FMCH to establish, maintain or
               make the required payments to the escrow account described in
               Paragraph 2b.
               If payments due under Paragraph 1 are received late, but within
               the two-day grace period provided in Paragraph 5 of the
               Promissory Note, interest incurred during such grace period will
               be assessed at two times the daily amount in effect on the date
               the payment was due.

<PAGE>

     6.   NMC and FMCH shall provide the United States written notice of an
Event of Default within two (2) business days of such event by overnight mail,
or facsimile followed by overnight delivery, to the United States Attorney's
Office, District of Massachusetts, One Courthouse Way, Suite 9200, Boston, MA
02210, Attention: Suzanne E. Durrell, Assistant U.S. Attorney (or to the
attention of such other person as may be designated in writing by the United
States Attorney's Office).

     7.   Immediately upon the occurrence of an Event of Default,
without further notice or presentment and demand by the United States:

          a.  The Settlement Amount plus accrued interest through the end of the
applicable quarter as set forth in Paragraph 1 of the Promissory Note and the
Unreconciled Credit Balances referenced in Paragraph 3 above (minus any payments
to date of principle and accrued interest) shall become immediately due and
payable ("Settlement Default Amount").  Interest shall be calculated on the
Settlement Default Amount at the Prime Rate as published in the Wall Street
                                                                -----------
Journal on the Effective Date of this Agreement, plus 5% from the date of the
- -------
Event of Default.

          b.  In addition, NMC and FMCH will pay the United States all
reasonable costs of collection and enforcement of this Agreement, including
attorney's fees and expenses, plus interest described in Paragraph 7.a. above.
The Settlement Default Amount, plus interest, described in Paragraph 7.a. above,
together with the costs of collection and enforcement described
<PAGE>

in this sub-paragraph, will be referred to as the "Default Obligation".

     8.   Upon the occurrence of an Event of Default, the United States may
exercise, at its sole option, one or more of the following rights:

          a.   The United States may draw the full amount available for drawing
under the Letter of Credit and retain all proceeds thereof.

          b.   The United States may enforce the terms of the Guarantee
Agreement between the United States of America, Fresenius Medical Care GMBH, a
German corporation and the predecessor of Fresenius Medical Care AG, W.R. Grace
& Co., a New York corporation, and National Medical Care, Inc., dated July 31,
1996, attached as Exhibit C.

          c.   The United States retains any and all other rights and remedies
it has or may have under law and equity.

          3.   No failure or delay on the part of the United States to exercise
               any right or remedy shall operate as a waiver of the United
               States' rights. No single or partial exercise by the United
               States of any right or remedy shall operate as a waiver of the
               United States' rights.

     9.   In an Event of Default under Paragraph 4.d. above (Commencement of
          Bankruptcy or Reorganization Proceeding): a. NMC and FMCH agree not to
          contest or oppose any motion filed by the United States seeking relief
          from or

<PAGE>

               modification of the automatic stay of 11 U.S.C. (S) 362(a); not
               to seek relief under 11 U.S.C. (S) 105 to enjoin or restrain the
               United States from recovering monies owed by NMC and FMCH arising
               out of this Agreement or the attached Promissory Note, or from
               recovering monies through presentment against the Letter of
               Credit. NMC and FMCH recognize that this express waiver is in
               consideration for the settlement of claims by the United States
               described in Preamble Paragraph H above, under the terms and
               conditions contained in this Settlement Agreement.

                         b.  By expressly waiving the automatic stay provision,
               NMC and FMCH agree not to oppose or interfere with any motion
               made in federal court (including bankruptcy courts) by the United
               States to suspend payments to NMC and DSD from the Title XVIII
               (Medicare), Title XIX (Medicaid) programs, and other federal
               health care programs;

                         c.  This Agreement shall be voidable at the sole
               option of the United States;

                         d.  If any term(s) of this Agreement are set aside for
               any reason, including as a result of a preference action brought
               pursuant to 11 U.S.C. (S) 547, the United States, at its sole
               option and in its discretion, may rescind all
<PAGE>

               terms of this Agreement and seek recovery of the full amount of
               claims and allegations identified herein and in the Civil
               Actions, or, in the alternative, enforce the remaining terms of
               this Agreement. In the event of rescission of this Agreement, all
               Parties reserve all rights, claims, and defenses that are
               available under law and equity as of the Effective Date of this
               Agreement; and

                          e.  In addition to the rights enumerated in Paragraph
               8.a. through 8.d. above, the United States and all other Parties
               shall retain all rights and claims they have or may have under
               law and equity.

                    10.   Subject to the exceptions and limitations in Paragraph
               11 below, in consideration of the obligations of DSD and FMCH set
               forth in this Agreement, conditioned upon payment in full of the
               Settlement Amount and the Unrecouped Credit Balances, subject to
               Paragraph 30, (concerning bankruptcy proceedings commenced within
               91 days of any payment under this Agreement), the United States,
               on behalf of itself, and its officers, agents, agencies, and
               departments, will release and will be deemed to have released DSD
               including NMC, FMCH, and the subsidiaries of NMC and FMCH listed
               on the
<PAGE>

               attached Exhibit D (collectively, the subsidiaries of NMC and
               FMCH listed on Exhibit D will be referred to as the "NMC
               Companies," and the corporate entities listed on Exhibit D
               comprise the only entities which constitute the "NMC Companies"
               within the meaning of this Agreement), and the current directors,
               officers, employees, and agents of the DSD, FMCH and the NMC
               Companies who were not employed by or in any way affiliated with
               DSD, FMCH and the NMC companies prior to September 30, 1996, from
               any civil or administrative monetary claim (including recoupment
               claims) that the United States has or may have under the False
               Claims Act, 31 U.S.C. (S)(S) 3729-3733; the Program Fraud Civil
               Remedies Act, 31 U.S.C. (S)(S) 3801-3812; the Civil Monetary
               Penalties Law, 42 U.S.C. (S) 1320a-7a; or common law claims for
               fraud, payment by mistake of fact, breach of contract or unjust
               enrichment for the conduct described in Preamble Paragraphs H and
               M above with respect to Medicare, Railroad Retirement Medicare,
               TRICARE, FEHBP, the VA, and/or the Medicaid programs of the
               Participating States and the Participating Territory.

                    11.  Notwithstanding any term of this Agreement, the United
               States specifically does not
<PAGE>

               release DSD, FMCH or the NMC Companies, or any individual from
               any and all of the following: (a) any potential criminal, civil
               or administrative claims arising under Title 26, U.S. Code
               (Internal Revenue Code); (b) any criminal liability; (c) any
               potential liability to the United States (or any agencies
               thereof) for any conduct other than that identified in Preamble
               Paragraphs H and M above, including but not limited to any
               allegations in the Civil Actions not encompassed by Preamble
               Paragraphs H and M; (d) any entities not specifically included on
               the list of NMC Companies set forth in Exhibit D; (e) any claims
               based upon such obligations as are created by this Agreement; (f)
               except as explicitly stated in this Agreement, any administrative
               liability, including mandatory exclusion from Federal health care
               programs; (g) any express or implied warranty claims or other
               claims for defective or deficient products and services provided
               by DSD, including quality of testing or product claims; (h) any
               claims for personal injury or property damage or for other
               consequential damages arising from the conduct described in
               Preamble Paragraphs H and M above; (i) any claims based upon
               failure to deliver items or services; (j) any civil or
               administrative claims against any individual who was an officer,

<PAGE>

               director, trustee, agent, employee, or was in any way affiliated
               with DSD or NMC's parents, subsidiaries, divisions, or affiliates
               at any time prior to September 30, 1996; or (k) any civil or
               administrative claims against any individual, including current
               directors, officers, employees and agents, who is criminally
               indicted or convicted of an offense, or who enters a criminal
               plea related to the conduct alleged in Preamble Paragraphs H and
               M above.

                    12.  FMCH, on behalf of itself and its parents, affiliates,
               subsidiaries, and divisions, including but not limited to NMC,
               has entered into a Corporate Integrity Agreement with HHS-OIG,
               which is incorporated by reference into this Agreement.  FMCH
               will immediately upon execution of this Agreement implement its
               obligations under the Corporate Integrity Agreement.

                    13.  In consideration of the obligations of DSD and FMCH
               set forth in this Agreement, conditioned upon payment in full of
               the Settlement Amount and the Unrecouped Credit Balances, subject
               to Paragraph 30 below (concerning bankruptcy proceedings
               commenced within 91 days of any payment under this Agreement),
               and conditioned upon FMCH's entering into the Corporate Integrity
<PAGE>

               Agreement incorporated by reference, the OIG-HHS agrees to
               release and refrain from instituting, directing, or maintaining
               any administrative claim or any action seeking exclusion from the
               Medicare, Medicaid or other Federal health care programs (as
               defined in 42 U.S.C. (S) 1320a-7b(f)) against DSD, FMCH or the
               NMC Companies and their current directors, officers, employees,
               and agents who were not employed by or in any way affiliated with
               DSD or any of NMC's parents, subsidiaries, divisions, or
               affiliates at any time prior to September 30, 1996, under 42
               U.S.C. (S) 1320a-7a (Civil Monetary Penalties Law) or 42 U.S.C.
               (S) 1320a-7(b) (permissive exclusion) for the conduct described
               in Preamble Paragraphs H and M, except as reserved in Paragraph
               11 above and as reserved in this Paragraph.  The OIG-HHS
               expressly reserves all rights to comply with any statutory
               obligations to exclude the DSD, FMCH and the NMC Companies from
               the Medicare, Medicaid, or other Federal health care programs
               under 42 U.S.C. (S) 1320a-7(a) (mandatory exclusion).  Nothing in
               this Paragraph precludes the OIG-HHS from taking action against
               entities or individuals for conduct and practices for which civil
               claims have been reserved in Paragraph 11 above.
<PAGE>

                    14.    In consideration of the obligations of DSD and
               FMCH set forth in this Agreement, conditioned upon payment in
               full of the Settlement Amount and Unrecouped Credit Balances, and
               subject to Paragraph 30 below (concerning bankruptcy proceedings
               commenced within 91 days of any payment under this Agreement),
               TSO agrees to release and refrain from instituting, directing, or
               maintaining any administrative claim or any action seeking
               exclusion from the TRICARE program against DSD, FMCH or the NMC
               Companies and their directors, officers, employees, and agents
               who were not employed by or in any way affiliated with DSD or
               NMC's subsidiaries, divisions, and affiliates at any time prior
               to September 30, 1996, under 32 C.F.R. (S) 199.9 for the conduct
               described in Preamble Paragraphs H and M, except as reserved in
               Paragraph 11 above and as reserved in this Paragraph.  The TSO
               expressly reserves all rights to comply with any statutory
               obligations to exclude DSD, FMCH and the NMC Companies from the
               TRICARE program under 32 C.F.R. (S)(S) 199.9(f)(1)(i)(A),
               (f)(1)(i)(B), (f)(1)(i)(D), and (f)(1)(iii).  Nothing in this
               Paragraph precludes the TSO from taking action against entities
               or persons, or for conduct or practices, for which
<PAGE>

               civil claims have been reserved in Paragraph 11 above.

                    15.  In consideration of the obligations of DSD and FMCH as
               set forth in this Agreement, conditioned upon payment in full of
               the Settlement Amount and Unrecouped Credit Balances, and subject
               to Paragraph 30 below (concerning bankruptcy proceedings
               commenced within 91 days of any payment under this Agreement),
               OPM agrees to release and refrain from instituting, directing, or
               maintaining any administrative claim or any action seeking
               exclusion from FEHBP against DSD, FMCH and the NMC Companies and
               their directors, officers, employees, and agents who were not
               employed by or in any way affiliated with DSD or NMC's
               subsidiaries, divisions, or affiliates at any time prior to
               September 30, 1996, under 5 U.S.C. (S) 8902a or 5 C.F.R. Part 970
               for the conduct described in Preamble Paragraphs H and M
               including that in the Civil Action, except as reserved
<PAGE>

               in Paragraph 11 above, and except if the DSD, FMCH or the NMC
               Companies or any individuals are excluded by the Office of
               Inspector General of HHS pursuant to 42 U.S.C. (S) 1320a-7(a).
               Nothing in this paragraph precludes OPM from taking action
               against entities or persons, or for conduct and practice for
               which civil claims have been reserved in Paragraph 11 above. 16.
               Bradford agrees that the settlement of his Civil Action is fair,
               adequate and reasonable under all the circumstances, pursuant to
               31 U.S.C. (S) 3730(c)(2)(B). Price agrees that the settlement of
               his Civil Action is fair, adequate and reasonable under all the
               circumstances, pursuant to 31 U.S.C. (S) 3730(c)(2)(B). On the
               United States' receipt of the First Payment pursuant to Paragraph
               1 above, each of Relator Price and Bradford, for himself, his
               heirs, successors and assigns, will release and will be deemed to
               have released DSD, FMCH and the NMC Companies and their parents,
               affiliates, divisions, subsidiaries, predecessors, successors,
               assigns, and transferees, and any of their current or former
               directors, officers, employees, counsel, agents, and
               representatives from any and all claims that he has or may have
               that arise from or relate to any and all of the allegations in
               his Civil Action, the conduct described in Preamble Paragraphs H
               and M, and his employment with any of the corporate entities
               referenced in this Paragraph, except claims by Relators Price
               and/or Bradford for attorney's fees and costs pursuant to 31
               U.S.C. (S) 3730(d)(1). If NMC and FMCH default on their payment
               obligations under Paragraph 1
<PAGE>

               above, the respective releases given by Relator Price and
               Bradford shall, at the sole option and discretion of each
               Relator, upon written notice to NMC and FMCH, be rescinded.

                    17.  The United States agrees to pay Relators Bradford and
               Price according to the terms set forth below:

                         a.  The United States agrees to pay Relator Bradford
               18% from the Federal Share of the Settlement Amount attributable
               to the allegations in the Bradford qui tam ($799,194), a total
               principal amount of one hundred forty three thousand eight
               hundred fifty five dollars ($143,855) plus 18% of the interest
               paid by NMC and FMCH on that principal amount, if any. To satisfy
               this obligation, the United States will pay Relator Bradford as
               payments by NMC are received under the terms of the
<PAGE>

               Promissory Note, as more particularly set forth in Exhibit A to
               the Promissory Note as those payments relate to this Agreement.
               The first payment to Relator Bradford will be made within 21 days
               after the First Payment Date, and subsequent payments to Relator
               Bradford will be made within 21 days after each additional
               payment is received by the United States, by wire transfer to
               Relator Bradford in accordance with instructions to be provided
               by Relator's counsel.  Relator Bradford, for himself
               individually, and for his respective heirs, successors, and
               assigns, will release and will be deemed to have released and
               forever discharged the United States from any claims pursuant to
               31 U.S.C. (S) 3730, including 31 U.S.C. (S)(S) 3730(b), (c), (d)
               and (d)(1), for a share of the proceeds of the Civil Action, from
               any claims for a share of the Settlement Amount, and from any
               claims arising from the filing of his Civil Action, and in full
               settlement of claims under this Agreement.  This Agreement does
               not resolve or in any manner affect any claims the United States
               has or may have against Relator Bradford, arising under Title 26,
               U.S. Code (Internal Revenue Code), or any claims arising under
               this Agreement.
<PAGE>

                    b.  The United States agrees to pay Relator Price 18% of the
               Federal Share of the Settlement Amount attributable to the
               allegations of the Price qui tam ($15,204,234), a total principal
               amount of two million seven hundred thirty six thousand seven
               hundred sixty two dollars ($2,736,762), plus 18% of the interest
               paid by NMC and FMCH on that principle amount of $15,204,234, if
               any.   To satisfy this obligation, the United States will pay
               Relator Price as payments by NMC are received under the terms of
               the Promissory Note, as more particularly set forth in Exhibit A
               to the Promissory Note as those payments relate to this
               Agreement.  The first payment to Relator Price will be made
               within 21 days after the First Payment Date, and subsequent
               payments to Relator Bradford will be made within 21 days after
               each additional payment is received by the United States, by wire
               transfer to Relator Price in accordance with instructions to be
               provided by Relator's counsel.  Relator Price, for himself
               individually, and for his respective heirs, successors, and
               assigns, will release and will be deemed to have released and
               forever discharged the United States from any claims pursuant to
               31 U.S.C. (S) 3730, including 31 U.S.C. (S)(S) 3730(b), (c), (d)
               and (d)(1), for a
<PAGE>

               share of the proceeds of the Civil Action, from any claims for a
               share of the Settlement Amount, and from any claims arising from
               the filing of his Civil Action, and in full settlement of claims
               under this Agreement. This Agreement does not resolve or in any
               manner affect any claims the United States has or may have
               against Relator Price, arising under Title 26, U.S. Code
               (Internal Revenue Code), or any claims arising under this
               Agreement.

                    18.  After this Agreement is fully executed, the United
               States and the Relators will notify the Court that all pertinent
               Parties have stipulated that, to the extent alleged in Paragraph
               H only, the Civil Action shall be dismissed with prejudice
               effective upon receipt by the United States, the Participating
               States and Participating Territory of the payments described in
               Paragraph 1 above, pursuant to and consistent with the terms of
               this Agreement.  The United States and the Relators will also
               notify the court that all pertinent Parties have stipulated that
               the remaining claims by the Relators in the Civil Actions, to the
               extent not alleged in Preamble Paragraph H, shall be dismissed
               with prejudice as to the respective Relator and without prejudice
               as to the United States with the exception of Relators' claims
               for
<PAGE>

               attorney's fees and costs pursuant to 31 U.S.C. (S) 3730(d)(1),
               which shall not be dismissed. The Parties agree that, except for
               Relator Bradford's claims for statutory attorney's fees and
               costs, which will remain in the jurisdiction of the United States
               District Court for the Southern District of Florida, the United
               States District Court for the District of Massachusetts shall
               maintain jurisdiction of any remaining claims in each Civil
               Action, in any Events of Default as defined in Paragraph 4, or in
               the event of disputes under this Agreement.

                    19. Effective upon the filing and docketing of the notices
               of dismissal described in Paragraph 18, DSD, FMCH and the NMC
               Companies, and their parent, successor, subsidiary and affiliate
               corporations release and will be deemed to have released each of
               Bradford and Price, individually, any and all claims that these
               corporations have or may have related to or arising from any of
               the allegations in the Civil Actions, the conduct described in
               Preamble Paragraph H and any matters arising from either
               Relator's employment with the corporate entities referenced in
               this Paragraph.

                    20. DSD, FMCH and the NMC Companies waive and will not
               assert any defenses these entities may have to any criminal
               prosecution or
<PAGE>

               administrative action relating to the conduct described in
               Preamble Paragraphs H and M, which defenses may be based in whole
               or in part on a contention that, under the Double Jeopardy Clause
               of the Fifth Amendment of the Constitution or Excessive Fines
               Clause of the Eighth Amendment of the Constitution, this
               Settlement Agreement bars a remedy sought in such criminal
               prosecution or administrative action. DSD and the NMC Companies
               further agree that nothing in this Agreement is punitive in
               purpose or effect.

                FMCH and the NMC Companies covenant to cooperate fully
and truthfully with the United States' civil investigation of individuals and
entities not specifically released in this Agreement.  Upon reasonable notice,
the NMC Companies will make reasonable efforts to facilitate access to, and
encourage the cooperation of, its directors, officers, and employees for
interviews and testimony, consistent with the rights and privileges of such
individuals, and will furnish to the United States, upon reasonable request, all
non-privileged documents and records in its possession, custody or control.

     22.  On the effective date of this Agreement, DSD, FMCH and the NMC
Companies release and will be deemed to have released the United States, its
agencies, employees, servants, and agents from any claims (including attorneys
fees, costs, and expenses of every kind and however denominated) which DSD and
the NMC
<PAGE>

Companies have or may have against the United States, its agencies, employees,
servants, and agents, related to or arising from the United States' civil,
criminal and administrative investigation and prosecution of DSD, NMC and FMCH.

     23.  The Settlement Amount and the Unrecouped Credit Balances that NMC and
FMCH must pay pursuant to Paragraphs 1 and 3 of this Agreement will not be
decreased as a result of the denial of claims for payment now being withheld
from payment by any Medicare carrier or intermediary, Railroad Retirement
Medicare carrier, TRICARE, FEHBP, VA, or any Medicaid payor, related to the
conduct described in Preamble Paragraph H; and DSD and the NMC Companies agree
not to resubmit to any Medicare carrier or intermediary, Railroad Retirement
Medicare carrier,  TRICARE, FEHBP, VA, or any Medicaid payor any previously
denied claims related to the conduct described in Preamble Paragraph H, and
agree not to appeal any such denials of claims.

     24.  The FMCH and the NMC Companies agree that all costs (as defined in the
Federal Acquisition Regulations ("FAR") (S) 31.205-47 and in Titles XVIII and
XIX of the Social Security Act, 42 U.S.C. (S)(S) 1395-1395ddd (1997) and 1396-
1396v(1997), and the regulations promulgated thereunder) incurred by or on
behalf of DSD and the NMC Companies, and their divisions, subsidiaries and
affiliates, and their present and former officers, directors, employees,
shareholders and agents in connection with: (a) the matters covered by this
Agreement; (b) the Government's audits, administrative, civil and criminal
investigation and prosecution of DSD and FMCH; (c) these corporate entities'
investigation,
<PAGE>

defense, and corrective actions undertaken in response to the Government's
administrative, civil and criminal investigations, and in connection with the
matters covered by this Agreement, and including the obligations undertaken
pursuant to the Corporate Integrity Agreement (including attorneys fees); (d)
the negotiation and performance of this Agreement, and the Corporate Integrity
Agreement; and (e) the payments made to the United States provided for in this
Agreement, and to Relators for attorney's fees and costs, are unallowable costs
on Government contracts and under Medicare, Railroad Retirement Medicare,
Medicaid, TRICARE, FEHBP, and the VA programs (hereafter, "unallowable costs").
These unallowable costs will be separately estimated and accounted for by DSD
and the NMC Companies and these entities will not charge such unallowable costs
directly or indirectly to any contracts with the United States or any Medicaid
program, or seek payment for such unallowable costs through any cost report,
cost statement, information statement or payment request submitted by the NMC
Companies or any of their divisions, subsidiaries or affiliates to the Medicare,
Railroad Retirement Medicare, Medicaid, TRICARE, VA or FEHBP programs.

     FMCH and the NMC Companies further agree that within 270 days of the
effective date of this Agreement these entities will identify to applicable
Medicare, Railroad Retirement Medicare, and TRICARE fiscal intermediaries,
carriers and/or contractors, and Medicaid, VA and FEHBP fiscal agents, any
unallowable costs (as defined above) included in payments previously sought from
the United States, or any Medicaid Program, including, but not
<PAGE>

limited to, payments sought in any cost reports, cost statements, information
reports, or payment requests already submitted by the NMC Companies or any of
their subsidiaries, affiliates, or divisions and will request, and agree, that
such cost reports, cost statements, information reports or payment requests,
even if already settled, be adjusted to account for the effect of the inclusion
of the unallowable costs. FMCH and the NMC Companies agree that the United
States will be entitled to recoup from the NMC Companies any overpayment as a
result of the inclusion of such unallowable costs on previously-submitted cost
reports, information reports, cost statements or requests for payment. Any
payments due after the adjustments have been made shall be paid to the United
States pursuant to the direction of the Department of Justice, and/or the
affected agencies. The United States reserves its rights to disagree with any
calculations submitted by DSD, FMCH and the NMC Companies, or any of their
subsidiaries, affiliates or divisions, on the effect of inclusion of unallowable
costs (as defined above) on the NMC Companies or any of their subsidiaries,
affiliates or divisions' cost reports, cost statements or information reports.
Nothing in this Agreement shall constitute a waiver of the rights of the United
States to examine or reexamine the unallowable costs described above.

     25.  This Agreement is intended to be for the benefit of the Parties only,
and by this instrument the Parties do not release any claims against any other
person or entity except as
<PAGE>

specifically identified in Paragraphs 10, 13, 14, 15, 16, 17 and 19 above.

     26.  FMCH and the NMC Companies agree that they will not seek payment for
any of the health care billings covered by this Agreement from any health care
beneficiaries or their parents, sponsors, estates, heirs, successors or assigns.
DSD and the NMC Companies waive any causes of action against these beneficiaries
or their parents, sponsors, estates, heirs, successors, or assigns based upon
the claims for payment covered by this Agreement.

     27.  Nothing in this Agreement constitutes an agreement by the United
States concerning the characterization of the amounts paid hereunder for
purposes of any proceeding under Title 26 of the Internal Revenue Code.

     28.  Except as provided in Paragraph 7.b., and except for Relators' claim
for statutory attorney's fees and costs, each party to this Agreement will bear
its own legal and other costs incurred in connection with this matter, including
by way of example only, all costs incurred in the investigation and defense of
this matter, the preparation and performance of this Agreement, and all
corrective actions taken in response to the investigation and resolution of this
matter.

     29.  NMC and FMCH expressly warrant that they have reviewed their financial
condition and that they currently are solvent on a consolidated basis within the
meaning of 11 U.S.C. Section 547(b)(3), and expect to remain solvent on a
consolidated basis following payment to the United States hereunder. Further,
the
<PAGE>

Parties expressly warrant that, in evaluating whether to execute this Agreement,
the Parties (a) have intended that the mutual promises, covenants and
obligations set forth herein constitute a contemporaneous exchange for new value
given to DSD, NMC and FMCH within the meaning of 11 U.S.C. Section 547(c)(1),
and (b) have concluded that these mutual promises, covenants, and obligations
do, in fact, constitute such a contemporaneous exchange.

     30.  In the event NMC or FMCH commences, or a third party commences, within
91 days of any payment under of this Agreement, any case, proceeding, or other
action (i) under any law relating to bankruptcy, insolvency, reorganization or
relief of debtors, seeking to have any order for relief of NMC and/or FMCH's
debts, or seeking to adjudicate NMC and/or FMCH as bankrupt or insolvent, or
(ii) seeking appointment of a receiver, trustee, custodian or other similar
official for NMC and/or FMCH or for all or any substantial part of NMC and/or
FMCH's assets, NMC and FMCH agree as follows:

          a.   NMC and FMCH's obligations under this Agreement may not be
avoided pursuant to 11 U.S.C. Section 547, and NMC and FMCH will not argue or
otherwise take the position in any such case, proceeding or action that:  (i)
NMC and/or FMCH's obligations under this Agreement may be avoided under 11
U.S.C. Section 547; (ii) NMC and FMCH were insolvent on a consolidated basis at
the time this Agreement was entered into, or became insolvent on a consolidated
basis as a result of the payment made to the United States hereunder; or (iii)
the mutual promises, covenants and obligations set forth in this Agreement do
not
<PAGE>

constitute a contemporaneous exchange for new value given to NMC and/or FMCH.

          b. In the event that NMC and/or FMCH's obligations hereunder are
avoided pursuant to 11 U.S.C. Section 547, the United States, at its sole
option, may rescind the releases in this Agreement, and bring any civil and/or
administrative claim, action or proceeding against DSD, and/or FMCH for the
claims that would otherwise be covered by the releases provided in Paragraphs
10,13, 14 and 15 above. If the United States chooses to do so, DSD and FMCH
agree that (i) any such claims, actions or proceedings brought by the United
States (including any proceedings to suspend payments to NMC and DSD from
Medicare, Medicaid, or other federal health care programs) are not subject to an
"automatic stay" pursuant to 11 U.S.C. Section 362(a) as a result of the action,
case or proceeding described in the first clause of this Paragraph, and that DSD
and FMCH will not argue or otherwise contend that the United States' claims,
actions or proceedings are subject to an automatic stay; (ii) that DSD and FMCH
will not plead, argue or otherwise raise any defenses under the theories of
statute of limitations, laches, estoppel or similar theories, to any such civil
or administrative claims, actions or proceeding which are brought by the United
States within 90 calendar days of written notification to NMC and FMCH that the
releases herein have been rescinded pursuant to this Paragraph, except to the
extent such defenses were available on the date of this Agreement; and (iii) the
United States has a valid claim against NMC and FMCH in the

<PAGE>

amount of the Default Obligation, and the United States may pursue its claim,
inter alia, in the Price and Bradford Civil Actions, as well as in any other
case, action, or proceeding.

          c.   DSD and FMCH acknowledge that its agreements in this Paragraph
are provided in exchange for valuable consideration provided in this Agreement.

     31. DSD and FMCH and the Relators represent that this Agreement is freely
and voluntarily entered into without any degree of duress or compulsion
whatsoever.

     32. This Agreement is governed by the laws of the United States. The
Parties agree that the exclusive jurisdiction and venue for any disputes arising
between and among the Parties under this Agreement will be the United States
District Court for the District of Massachusetts, except that disputes arising
under the Corporate Integrity Agreement shall be resolved exclusively upon the
dispute resolution provisions set forth in the Corporate Integrity Agreemen t.

     33. The undersigned DSD and FMCH signatories represent and warrant that
they are authorized by their respective Board of Directors to execute this
Agreement. The undersigned United States signatories represent that they are
signing this Agreement in their respective official capacities and that they are
authorized to execute this Agreement.

     34. Except for the representations in Paragraph 29 (regarding solvency),
Paragraph 30 (concerning bankruptcy proceedings commenced within 91 days of any
payments under this Agreement), and Preamble Paragraph M (express
representations by

<PAGE>

NMC and FMCH upon which the United States relies), the Parties agree that
nothing in this Agreement constitutes an admission by any person or entity with
respect to any issue of law or fact.

     35. This Agreement is effective on the date of signature of the last
signatory to the Agreement (the "Effective Date").

     36. This Agreement shall be binding on all successors, transferees, heirs
and assigns.

     37. This Agreement, together with Exhibits A through E, and the Corporate
Integrity Agreement, constitute the complete agreement among the Parties with
regard to the conduct described in Preamble Paragraphs H and M and the Civil
Actions. This Agreement may not be amended except by written consent of the
Parties, except that only FMCH and OIG-HHS must agree in writing to modification
of the Corporate Integrity Agreement.

     38. This Agreement may be executed in counterparts, each of which shall
constitute an original and all of which shall constitute one and the same
Agreement.

                                    THE UNITED STATES OF AMERICA
                                    ----------------------------



     /s/ Suzanne E. Durrell                 January 18, 2000
By:  --------------------------     Dated:  ------------------
     SUZANNE E. DURRELL
     Assistant U.S. Attorney
     District of Massachusetts


     /s/ Mark A. Lavine                     January 18, 2000
By:  --------------------------     Dated:  ------------------
     MARK LAVINE
     Assistant U.S. Attorney
     Southern District of Florida


     /s/ Patricia M. Connolly               January 18, 2000
By:  --------------------------     Dated:  ------------------
     PATRICIA M. CONNOLLY
     Special Assistant U.S. Attorney
     District of Massachusetts


By:  /s/ Maya Guerra                        January 18, 2000
     --------------------------     Dated:  ------------------
     MAYA GUERRA
     Trial Attorney
     Civil Division
     U.S. Department of Justice







<PAGE>

     /s/ Lewis Morris                            1/18/00
By:  --------------------------     Dated:  ------------------
     LEWIS MORRIS
     Assistant Inspector General
     Office of Inspector General
     U.S. Department of Health and
          Human Services



     /s/ Frank D. Titus                     January 18, 2000
By:  --------------------------     Dated:  -------------------
     FRANK D. TITUS
     Assistant Director for
          Insurance Programs
     U.S. Office of Personnel
          Management



     /s/ Robert D. Seaman                   1-18-00
By:  --------------------------     Dated:  -------------------
     ROBERT D. SEAMAN
     General Counsel
     TRICARE Support Office
     U.S. Department of Defense
<PAGE>

                  NATIONAL MEDICAL CARE, INC.
              FRESENIUS MEDICAL CARE HOLDINGS, INC.



By:  /s/ Ben J. Lipps                    Dated:     1/18/00
     ------------------------                   --------------------
     Ben J. Lipps
     President
     National Medical Care, Inc.



By:  /s/ Ben J. Lipps                    Dated:     1/18/00
     ------------------------                   --------------------
     Ben J. Lipps
     President
     Fresenius Medical Care Holdings, Inc.


Acknowledged:
- -------------


By:  /s/ Ronald L. Castle           Dated:      1/18/00
     ------------------------              -------------------
     RONALD L. CASTLE
     Counsel to NMC Dialysis
     Services Division, Inc.
     National Medical Care, Inc.
     Fresenius Medical Care Holdings, Inc.




By:  /s/ Alan E. Reider             Dated:      1/18/00
     -----------------------               -------------------
     ALAN E. REIDER
     Counsel to NMC Dialysis
     Services Division, Inc.
     National Medical Care, Inc.
     Fresenius Medical Care Holdings, Inc.
<PAGE>

                            RELATOR GREGORY S. PRICE



By: /s/ Gregory S. Price                 Dated:    1/18/00
   -----------------------                     ----------------
   Gregory S. Price



Acknowledged:
- -------------



By: /s/ W. Christian Hoyer               Dated:    1/18/00
   -----------------------                     ----------------
   W. Christian Hoyer
   Counsel to Messr. Price
<PAGE>

                            RELATOR RICHARD BRADFORD


By: /s/ Richard Bradford                 Dated:   1/18/00
   -----------------------                     ----------------
   Richard Bradford



Acknowledged:
- -------------



By: /s/ Robert Barnett                   Dated:   1/18/00
   -----------------------                     ----------------
   Robert Barnett
   Counsel to Messr. Bradford
<PAGE>

                                   EXHIBIT A
                               (Promissory Note)

The Promissory Note dated January 19, 2000 from National Medical Care, Inc. and
Fresenius Medical Care Holdings, Inc. payable to the order of the United States
is incorporated by reference to Exhibit A of Exhibit 10.2 to this Current Report
on Form 8-K.
<PAGE>

                                   EXHIBIT B
          (Amendment to Irrevocable Nontransferable Letter of Credit)

The Amendment to Irrevocable Nontransferable Letter of Credit dated January 19,
2000 issued by the Bank of Nova Scotia, Atlanta Agency to the United States is
incorporated by reference to Exhibit B of Exhibit 10.2 to this Current Report on
Form 8-K.
<PAGE>

                                   EXHIBIT C
                                  (Guarantee)

The Guarantee Agreement dated as of July 31, 1996 among Fresenius Medical Care
GmbH, the predecessor to Fresenius Medical Care AG, National Medical Care, Inc.,
W.R. Grace & Co. and the United States of America, is incorporated by reference
to the Company's Registration Statement on Form S-4 (Registration No. 333-09497)
dated August 2, 1996 and the exhibits thereto.
<PAGE>

                                   EXHIBIT D
                    (List of Fresenius Affiliated Entities)

The List of Fresenius Affiliated Entities is incorporated by reference to
Exhibit D of Exhibit 10.2 to this Current Report on Form 8-K.

<PAGE>

                                    EXHIBIT E


                     [LETTERHEAD OF FRESENIUS MEDICAL CARE]

                                        January 4, 2000



Mr. Alan Reider
Arent Fox Kintner Plotkin & Kahn
1050 Connecticut Avenue, NW
Washington, DC  20036-5339

Dear Alan:

     I enclose a summary of Medicare credit balances for FMC dialysis facilities
which were entered into the 4245 account through December 31, 1998, (Exhibit A).
These balances have not been recouped by the Medicare fiscal intermediaries as
of January 3, 2000.

     An explanation of procedures used to develop the summary is also enclosed.
(Exhibit B).

     A listing of all NMC dialysis billing centers and associated provider
numbers is being prepared and will be forwarded by separate cover.

     Please not that the total outstanding credit balance of $10,982,885. 16
excludes funds taken into income prior to 1994 which are addressed in the
pending civil settlement.

     Please do not hesitate to call me if you have any questions.

                                               Sincerely,

                                               /s/ John Markus

                                               John Markus
                                               Senior Vice President
                                               Corporate Compliance

JM/mep

Attachments

cc:  J. Chiel, Esq.
     D. Kott
     B. McGorty
     J. Ramella
<PAGE>

               MEDICARE UNRECONCILED PAYMENTS BY TRANSACTION CODE
                                THROUGH 12/31/98
                               FOR ALL FACILITIES
                             (QUERY RUN DATE 1/3/00)



     Transaction             Transaction                            Total
        Code                    Name                                Amount
- --------------------------------------------------------------------------------
        OPR              Unreconciled Payment                    $74,681,842.81

        OPMR             Medicare Refund                         ($1,250,561.72)

        OPF              Refund                                  ($8,604,488.78)

        OPA              Recoupment                             ($50,302,511.80)

        OPD              Transfer to Corporate                   ($5,111,380.29)

        OPCC             Debit Correction                        ($5,490,761.40)

        OPCD             Credit Correction                        $6,185,324.36

        OPMD             Medicare Credit                            $163,526.07

        OPG              Audited Transaction                        $618,387.11
                                                                    -----------

                         Medicare UP Balance from System:        $10,889,366.36

                         Neomedica UP Balance:                       $93,518.80
                                                                     ----------

                         Total Medicare UP Balance:              $10,982,885.16
<PAGE>

              FRESENIUS MEDICAL CARE'S UNRECONCILED PAYMENT SYSTEM
                         AN OVERVIEW OF ACCOUNT 4245 AND
                          THE OPEN BALANCE CALCULATION



FMC, through input to the Medical Manager Cash Management System, posts all
payments which represent credit balances to the 4245 account which is the
Unreconciled Payment (U/P) account.  These credits are posted to the G/L as a
liability.  All subsequent debit and credit activity is made utilizing
transaction codes.

All U/P transactions are maintained in a separate database which currently
resides on the HP UX10.20 server.   There had been no purges to the database and
this database is accessed using a SQLPLUS query tool.

In preparation for our settlement of U/P issues with the OIG, query Q010200.txt
was run in January.  The selection criteria was to produce a summary of all
transactions for Medicare credit balances by year for all dates through December
31, 1998.  The U/P system does not produce an open balance report.  We have
calculated the U/P balance using the summaries of all the credit and debit
transactions.

This query report is the basis for determining the U/P balance for all Medicare
credit balances recorded in the system through December 31, 1998.  The report
indicates that $74,681,842.81 (transaction code OPR) in Medicare credits was
posted as unreconciled payments.  Of this amount $9,855,060.50 (transaction
codes OPF and OPMR) was refunded to Medicare and $50,302,511.80 was recouped by
Medicare (transaction code OPA).  The total of all Medicare refunds and
recoupments is $60,157,572.30 through December 31, 1998.

The $5,111,380.29 represents monies transferred to Corporate (transaction code
OPD) and taken into income.

Transaction codes OPCC and OPCD are debit and credit entries used to correct
errors and adjustments to U/Ps already keyed into the system.

Transaction code OPMD, a Medicare credit of $163,526.07, was occasionally
utilized in the past and is an addition to the U/P total.  We have not done a
detailed research of these entries.

Transaction code OPG entitled Audited Transaction $618,387.11 occurred from 1979
through 1981.  We have been advised that these were additions made to the U/P
account based on account audits.

The U/P Medicare Balance on the 4245 account for this time period is
$10,889,366.36.  In addition we have $93,518.80 in unrefunded and unrecouped
Medicare credit balances form Neomedica which maintains separate accounting
records and does not appear in our 4245 account.
<PAGE>

<TABLE>
<CAPTION>
FRESENIUS MEDICAL
CARE, N.A.
DIVISION SUMMARY BY FISCAL INTERMEDIARY


      Facility Name            Facility         Medicare provider      Fiscal Intermediary
                                Number                 #
- -------------------------------------------------------------------------------------------------
<S>                               <C>              <C>            <C>
Mansfield                         1262               36-2508            Administar Federal
Central Ohio                      1272               36-2501            Administar Federal
Akron                             1273               36-2503            Administar Federal
Indianapolis                      1300               15-2500            Administar Federal
Marion County                     1362               15-2512            Administar Federal
Grant Park                        1433               36-2514            Administar Federal
Southern Indiana                  1434               15-2504            Administar Federal
Anderson                          1481               15-2510            Administar Federal
South Summit                      1633               36-2521            Administar Federal
Central Ohio East                 1639               36-2520            Administar Federal
Northwest Indianapolis            1697               15-2524            Administar Federal
Wooster                           1724               36-2531            Administar Federal
Ashland                           1795               18-2524            Administar Federal
Portsmouth                        1796               36-2534            Administar Federal
Heart Of Ohio                     1827               36-2549            Administar Federal
Scottsburg                        1906               15-2529            Administar Federal
Louisville                        1250               18-2503              Administar/Kent
Somerset                          1480               18-2516              Administar/Kent
West Louisville                   1490               18-2514              Administar/Kent
South Louisville                  1635               18-2523              Administar/Kent
East Louisville                   1676               18-2527              Administar/Kent
Prestonburg                       1791               18-2507              Administar/Kent
Hazard                            1792               18-2517              Administar/Kent
Morehead                          1793               18-2509              Administar/Kent
Bishop Lane                       1794               18-2521              Administar/Kent
BMA LEWISTON                      1102               20-2501         Assoc. Hosp. Svcs. of ME
BMA FRAMINGHAM                    1109               22-2504         Assoc. Hosp. Svcs. of ME
BMA BOSTON-TKC                    1110               22-2500         Assoc. Hosp. Svcs. of ME
BMA SPRINGFIELD                   1111               22-2502         Assoc. Hosp. Svcs. of ME
BMA CAPE COD                      1112               22-2501         Assoc. Hosp. Svcs. of ME
BMA PROVIDENCE                    1170               41-2500         Assoc. Hosp. Svcs. of ME
BMA PORTLAND                      1190               20-2500         Assoc. Hosp. Svcs. of ME
BMA BOSTON (CARNEY)               1211               22-2506         Assoc. Hosp. Svcs. of ME
BMA MEDFORD                       1246               22-2507         Assoc. Hosp. Svcs. of ME
BMA WOONSOCKET                    1307               41-2503         Assoc. Hosp. Svcs. of ME
BMA CHICOPEE                      1389               22-2513         Assoc. Hosp. Svcs. of ME
BMA BROCKTON                      1392               22-2505         Assoc. Hosp. Svcs. of ME
BMA WESTWOOD                      1422               22-2511         Assoc. Hosp. Svcs. of ME

</TABLE>
<PAGE>

<TABLE>
<CAPTION>


<S>                               <C>              <C>          <C>
BMA DOVER                         1449               30-2501         Assoc. Hosp. Svcs. of ME
BMA NEW HAMPSHIRE                 1450               30-2500         Assoc. Hosp. Svcs. of ME
BMA MANCHESTER                    1487               30-2502         Assoc. Hosp. Svcs. of ME
BMA ROXBURY                       1630               22-2525         Assoc. Hosp. Svcs. of ME
BMA FALL RIVER                    1631               22-2516         Assoc. Hosp. Svcs. of ME
BMA SHREWSBURY                    1684               22-2521         Assoc. Hosp. Svcs. of ME
BMA NORTH PROVIDENCE              1691               41-2506         Assoc. Hosp. Svcs. of ME
BMA WARWICK                       1692               41-2504         Assoc. Hosp. Svcs. of ME
BMA BATH                          1761               20-2502         Assoc. Hosp. Svcs. of ME
BMA BOSTON                        1942               22-2522         Assoc. Hosp. Svcs. of ME
BMA STONEHAM                      1943               22-2524         Assoc. Hosp. Svcs. of ME
BMA WEYMOUTH                      1944               22-2519         Assoc. Hosp. Svcs. of ME
Ohio Valley                       1077               39-2579         BCBS  of W. Pennsylvania
Jefferson                         1081               39-2576         BCBS  of W. Pennsylvania
Harrisburg                        1087               39-2594         BCBS  of W. Pennsylvania
Latrobe                           1108               39-2561         BCBS  of W. Pennsylvania
Philadelphia                      1120               39-2501         BCBS  of W. Pennsylvania
Southwestern Penna                1122               39-2519         BCBS  of W. Pennsylvania
Pottsville                        1123               39-2518         BCBS  of W. Pennsylvania
Pittsburgh                        1175               39-2503         BCBS  of W. Pennsylvania
Greensburg                        1176               39-2520         BCBS  of W. Pennsylvania
Butler                            1178               39-2525         BCBS  of W. Pennsylvania
Hazleton                          1209               39-2524         BCBS  of W. Pennsylvania
Northern Philadelphia             1220               39-2509         BCBS  of W. Pennsylvania
Easton                            1222               39-2517         BCBS  of W. Pennsylvania
Bethlehem                         1223               39-2511         BCBS  of W. Pennsylvania
Wilkes Barre                      1271               39-2512         BCBS  of W. Pennsylvania
East Stroudsburg                  1274               39-2547         BCBS  of W. Pennsylvania
Allentown                         1276               39-2505         BCBS  of W. Pennsylvania
Central Philadelphia              1281               39-2507         BCBS  of W. Pennsylvania
West Penn                         1302               39-2542         BCBS  of W. Pennsylvania
Northeastern Philadelphia         1314               39-2533         BCBS  of W. Pennsylvania
South Hills                       1324               39-2544         BCBS  of W. Pennsylvania
Abington                          1333               39-2506         BCBS  of W. Pennsylvania
Temple/Germantown                 1342               39-2530         BCBS  of W. Pennsylvania
Northwest Philadelphia            1380               39-2560         BCBS  of W. Pennsylvania
Three Rivers                      1386               39-2559         BCBS  of W. Pennsylvania
Fairmount                         1395               39-2540         BCBS  of W. Pennsylvania
New Castle                        1417               39-2552         BCBS  of W. Pennsylvania
Kittanning                        1418               39-2554         BCBS  of W. Pennsylvania
Pittston                          1514               39-2621         BCBS  of W. Pennsylvania
Mon Valley                        1606               39-2565         BCBS  of W. Pennsylvania
Episcopal                         1638               39-2568         BCBS  of W. Pennsylvania
Parkview                          1652               39-2569         BCBS  of W. Pennsylvania
Uniontown                         1683               39-2553         BCBS  of W. Pennsylvania
Ellwood City                      1698               39-2578         BCBS  of W. Pennsylvania

</TABLE>
<PAGE>

<TABLE>
<CAPTION>

<S>                               <C>              <C>           <C>
Fullerton                         1766               39-2603         BCBS  of W. Pennsylvania
Delco                             1831               39-2551         BCBS  of W. Pennsylvania
Manayunk                          1852               39-2611         BCBS  of W. Pennsylvania
South Philadelphia                1936               39-2607         BCBS  of W. Pennsylvania
Eastern Shore                     1066               01-2547              BCBS of Alabama
Mobile                            1204               01-2507              BCBS of Alabama
Huntsville                        1437               01-2522              BCBS of Alabama
Scottsboro                        1438               01-2519              BCBS of Alabama
Montgomery                        1462               01-2500              BCBS of Alabama
East Mobile                       1626               01-2524              BCBS of Alabama
West Mobile                       1627               01-2525              BCBS of Alabama
Prichard                          1634               01-2537              BCBS of Alabama
Univ S. Alabama                   1737               01-2559              BCBS of Alabama
Calhoun                           1050               11-2623              BCBS of Georgia
Tucker                            1113               11-2563              BCBS of Georgia
Dalton                            1164               11-2524              BCBS of Georgia
Marietta                          1212               11-2510              BCBS of Georgia
RCC Northern Georgia              1228               11-2551              BCBS of Georgia
Augusta                           1260               11-2501              BCBS of Georgia
Willette Wallace                  1268               11-2521              BCBS of Georgia
Thomson                           1270               11-2540              BCBS of Georgia
Carrollton                        1304               11-2520              BCBS of Georgia
Atlanta                           1308               11-2504              BCBS of Georgia
Eastman                           1309               11-2519              BCBS of Georgia
Warner Robbins                    1406               11-2531              BCBS of Georgia
Sandersville                      1407               11-2534              BCBS of Georgia
Macon                             1440               11-2533              BCBS of Georgia
Covington                         1442               11-2533              BCBS of Georgia
Dekalb-Gwinnett                   1443               11-2511              BCBS of Georgia
Coastal                           1561               11-2507              BCBS of Georgia
Washington                        1115               21-2503             BCBS of Maryland
Capitol Hill                      1116               09-2502             BCBS of Maryland
SE Washington                     1117               09-2505             BCBS of Maryland
Columbia Heights                  1118               09-2503             BCBS of Maryland
District of Columbia              1119               09-2501             BCBS of Maryland
Takoma Park                       1129               21-2533             BCBS of Maryland
Annapolis                         1181               21-2509             BCBS of Maryland
Baltimore                         1245               21-2504             BCBS of Maryland
Martin Luther King, Jr.           1306               09-2509             BCBS of Maryland
Laurel                            1354               21-2506             BCBS of Maryland
Leonardtown                       1355               21-2510             BCBS of Maryland
Camp Springs                      1356               21-2501             BCBS of Maryland
Anacostia                         1375               09-2508             BCBS of Maryland
Greater Baltimore                 1456               21-2531             BCBS of Maryland
Northeast D.C.                    1466               09-2515             BCBS of Maryland
La Plata                          1625               21-2541             BCBS of Maryland
</TABLE>
<PAGE>

<TABLE>
<CAPTION>

<S>                               <C>              <C>            <C>
South Annapolis                   1730               21-2557             BCBS of Maryland
Woodlawn                          1768               21-2558             BCBS of Maryland
Metropolitan                      1837               21-2524             BCBS of Maryland
Upper Marlboro                    1910               21-2559             BCBS of Maryland
QCDC Baltimore                    1948               21-2540             BCBS of Maryland
HIC Capitol                       1964               21-2562             BCBS of Maryland
HIC Baltimore                     1977               21-2554             BCBS of Maryland
BMA TRENTON                       1261               31-2504            BCBS of New Jersey
BMA JERSEY CITY                   1298               31-2502            BCBS of New Jersey
BMA PINEBROOK                     1330               31-2503            BCBS of New Jersey
BMA NEWARK                        1332               31-2505            BCBS of New Jersey
BMA IRVINGTON                     1334               31-2501            BCBS of New Jersey
BMA HILLSIDE                      1338               31-2506            BCBS of New Jersey
BMA HOBOKEN                       1716               31-2529            BCBS of New Jersey
BMA PRINCETON                     1717               31-2516            BCBS of New Jersey
BMA PLAINFIELD                    1720               31-2515            BCBS of New Jersey
BMA COLONIA                       1721               31-2518            BCBS of New Jersey
Rich Square                       1034               34-2586          BCBS of North Carolina
Pamlico                           1061               34-2561          BCBS of North Carolina
Lincolnton                        1092               34-2568          BCBS of North Carolina
Concord                           1126               34-2519          BCBS of North Carolina
West Charlotte                    1146               34-2554          BCBS of North Carolina
Chester                           1249               42-2518          BCBS of North Carolina
South Greensboro                  1269               34-2537          BCBS of North Carolina
North Charlotte                   1325               34-2549          BCBS of North Carolina
Charlotte                         1328               34-2503          BCBS of North Carolina
Gastonia                          1329               34-2513          BCBS of North Carolina
Kinston                           1358               34-2518          BCBS of North Carolina
Greesboro                         1366               34-2504          BCBS of North Carolina
New Bern                          1374               34-2534          BCBS of North Carolina
Asheboro                          1411               34-2524          BCBS of North Carolina
Monroe                            1415               34-2525          BCBS of North Carolina
Fayetteville                      1447               34-2510          BCBS of North Carolina
Lumberton                         1448               34-2528          BCBS of North Carolina
Burlington                        1482               34-2533          BCBS of North Carolina
Rocky Mount                       1498               34-2517          BCBS of North Carolina
Zebulon                           1520               34-2589          BCBS of North Carolina
Laurinburg                        1557               34-2540          BCBS of North Carolina
Windsor                           1607               34-2547          BCBS of North Carolina
Lenoir                            1608               34-2509          BCBS of North Carolina
Hickory                           1609               34-2516          BCBS of North Carolina
Albermarle                        1612               34-2555          BCBS of North Carolina
Raleigh                           1653               34-2512          BCBS of North Carolina
Smithfield                        1654               34-2545          BCBS of North Carolina
Cary                              1655               34-2544          BCBS of North Carolina
Roanoke Rapids                    1656               34-2542          BCBS of North Carolina

</TABLE>
<PAGE>

<TABLE>
<CAPTION>
<S>                               <C>              <C>            <C>
Clinton                           1688               34-2559          BCBS of North Carolina
Burke Cnty                        1699               34-2563          BCBS of North Carolina
Beatties Ford                     1772               34-2581          BCBS of North Carolina
West Pettigrew                    2016               34-2590          BCBS of North Carolina
Dunn                              2123               34-2557          BCBS of North Carolina
Wake                              2125               34-2522          BCBS of North Carolina
Pitt County                       1174               34-2502          BCBS of North Carolina
Queens QAKC Bal Sheet Acct        1106               33-2517                Empire BCBS
NY S.Queens                       1377               33-2531                Empire BCBS
Medical Center KC                 1594               33-3506                Empire BCBS
Nephro-Care                       2168               33-2534                Empire BCBS
RCC Brandywine                    1186               08-2501                Empire BCBS
RCC Millsboro                     1242               08-2503                Empire BCBS
RCC Central Delaware              1303               08-2502                Empire BCBS
Christiana                        1493               08-2506                Empire BCBS
Milford                           1719               08-2507                Empire BCBS
Southern Maryland/QCDC            1950               21-2539              Mutual of Omaha
Camden                            1254               42-2509          Palmetto Govt. Benefits
                                                                               Admin.
Beaufort                          1255               42-2514          Palmetto Govt. Benefits
                                                                               Admin.
Twin Oaks/Greenville              1279               42-2503          Palmetto Govt. Benefits
                                                                               Admin.
Columbia                          1294               42-2504          Palmetto Govt. Benefits
                                                                               Admin.
Lexington                         1379               42-2517          Palmetto Govt. Benefits
                                                                               Admin.
Georgetown                        1390               42-2519          Palmetto Govt. Benefits
                                                                               Admin.
Newberry                          1414               42-2531          Palmetto Govt. Benefits
                                                                               Admin.
S. Columbia                       1468               42-2543          Palmetto Govt. Benefits
                                                                               Admin.
Bennettsville                     1550               42-2520          Palmetto Govt. Benefits
                                                                               Admin.
Chesterfield                      1551               42-2551          Palmetto Govt. Benefits
                                                                               Admin.
Darlington                        1552               42-2530          Palmetto Govt. Benefits
                                                                               Admin.
Easley                            1554               42-2541          Palmetto Govt. Benefits
                                                                               Admin.
Kingstree                         1555               42-2521          Palmetto Govt. Benefits
                                                                               Admin.
LaurensCnty                       1556               42-2544          Palmetto Govt. Benefits
                                                                               Admin.
Marion                            1558               42-2545          Palmetto Govt. Benefits
                                                                               Admin.
</TABLE>
<PAGE>

<TABLE>
<CAPTION>


<S>                               <C>              <C>            <C>
Mid-Town/Nothside                 1559               42-2546          Palmetto Govt. Benefits
                                                                               Admin.
Rock Hill                         1560               42-2538          Palmetto Govt. Benefits
                                                                               Admin.
West Columbia                     1675               42-2550          Palmetto Govt. Benefits
                                                                               Admin.
Lower Richland                    1771               42-2564          Palmetto Govt. Benefits
                                                                               Admin.
Sumter                            1840               42-2510          Palmetto Govt. Benefits
                                                                               Admin.
Manning                           1841               42-2537          Palmetto Govt. Benefits
                                                                               Admin.
Loris                             1843               42-2535          Palmetto Govt. Benefits
                                                                               Admin.
Myrtle Beach                      1844               42-2507          Palmetto Govt. Benefits
                                                                               Admin.
Florence                          2087               42-2505          Palmetto Govt. Benefits
                                                                               Admin.
Bristol                           1201               44-2519          Riverbend Govt. Benefits
                                                                               Admin.
Eastern Tennessee                 1312               44-2522          Riverbend Govt. Benefits
                                                                               Admin.
Johnson City                      1391               44-2501          Riverbend Govt. Benefits
                                                                               Admin.
Kingsport                         1693               44-2577          Riverbend Govt. Benefits
                                                                               Admin.
Dialysis Assoc West               1974               44-2533          Riverbend Govt. Benefits
                                                                               Admin.
N. Knoxville                      1978               44-2527          Riverbend Govt. Benefits
                                                                               Admin.
BMA Rio Grande City               1021               45-2666                TrailBlazer
QCDC-Univ. Kid. Ctr. North        1022               45-2662                TrailBlazer
St. John's                        1062               10-2684                TrailBlazer
Yazoo City                        1065               25-2536                TrailBlazer
Mesa                              1069               03-2539                TrailBlazer
Arcadia                           1070               03-2542                TrailBlazer
North County                      1074               26-2509                TrailBlazer
Normandy                          1075               26-2531                TrailBlazer
Central Phoenix                   1078               03-2517                TrailBlazer
Sun City West                     1084               03-2546                TrailBlazer
South Mountain                    1085               03-2545                TrailBlazer
Florida Kidney Center             1095               10-2559                TrailBlazer
Northwest Broward                 1096               10-2544                TrailBlazer
Northeast Broward                 1097               10-2570                TrailBlazer
Tamarac                           1098               10-2629                TrailBlazer


</TABLE>
<PAGE>

<TABLE>
<CAPTION>


<S>                               <C>              <C>             <C>
Jacksonville                      1104               10-2612                TrailBlazer
New Iberia                        1107               19-2522                TrailBlazer
Belle Glade                       1114               10-2571                TrailBlazer
Miami                             1125               10-2503                TrailBlazer
Hialeah                           1127               10-2530                TrailBlazer
Tampa                             1130               10-2506                TrailBlazer
Eureka                            1137               05-2543                TrailBlazer
Los Angeles                       1140               05-2508                TrailBlazer
Long Beach                        1141               05-2523                TrailBlazer
Torrance                          1142               05-2556                TrailBlazer
Irving Dialysis Center            1143               45-2561                TrailBlazer
Oakland                           1147               05-2534                TrailBlazer
Fremont                           1149               05-2722                TrailBlazer
BMA Forth Worth                   1151               45-2502                TrailBlazer
BMA West Houston                  1154               45-2519                TrailBlazer
BMA Houston                       1155               45-2500                TrailBlazer
BMA Abilene                       1157               45-2511                TrailBlazer
BMA Amarillo                      1158               45-2513                TrailBlazer
BMA Corpus Christi                1159               45-2514                TrailBlazer
BMA Galveston                     1160               45-2520                TrailBlazer
Dublin                            1167               05-2568                TrailBlazer
BMA Santa Fe                      1169               32-2501                TrailBlazer
Union City                        1171               05-2571                TrailBlazer
Los Gatos                         1172               05-2694                TrailBlazer
BMA Alice                         1177               45-2537                TrailBlazer
Okeechobee                        1182               10-2589                TrailBlazer
BMA Pasadena                      1185               45-2533                TrailBlazer
Marrero                           1191               19-2521                TrailBlazer
Magee                             1193               25-2529                TrailBlazer
BMA Seguin                        1194               45-2545                TrailBlazer
Sanford                           1196               10-2546                TrailBlazer
BMA Rosenberg                     1197               45-2542                TrailBlazer
BMA Jasper                        1199               45-2573                TrailBlazer
BMA Laredo                        1210               45-2518                TrailBlazer
Humacao                           1214               40-2514                TrailBlazer
Mayaguez                          1215               40-2503                TrailBlazer
Permian Basin - Midland           1216               45-2512                TrailBlazer
Fort Collins                      1217               06-2505                TrailBlazer
BMA McAllen                       1218               45-2508                TrailBlazer
BMA Brownsville                   1219               45-2517                TrailBlazer
Deltona                           1224               10-2616                TrailBlazer
BMA Wichita Falls                 1226               45-2510                TrailBlazer
BMA Beaumont                      1227               45-2524                TrailBlazer
BMA Cypress Creek                 1229               45-2539                TrailBlazer
Caguas                            1231               40-2505                TrailBlazer
Bayamon                           1232               40-2504                TrailBlazer

</TABLE>
<PAGE>

<TABLE>
<CAPTION>



<S>                               <C>              <C>            <C>
Lincoln                           1236               03-2510                TrailBlazer
Ukiah                             1237               05-2548                TrailBlazer
BMA Uvalde                        1239               45-2540                TrailBlazer
Lafayette                         1240               19-2504                TrailBlazer
BMA S. San Antonio                1241               45-2544                TrailBlazer
South Phoenix                     1244               03-2508                TrailBlazer
Sarasota                          1252               10-2515                TrailBlazer
BMA Baytown                       1256               45-2575                TrailBlazer
Carbondale                        1258               14-2514                TrailBlazer
Gainsville                        1264               10-2512                TrailBlazer
Ponce                             1267               40-2502                TrailBlazer
BMA Albuquerque                   1278               32-2500                TrailBlazer
Santa Barbara                     1282               05-2513                TrailBlazer
BMA Bexar County                  1283               45-2527                TrailBlazer
San Juan                          1284               40-2501                TrailBlazer
BMA San Antonio                   1285               45-2507                TrailBlazer
Baton Rouge                       1286               19-2501                TrailBlazer
BMA West Ft. Worth                1287               45-2594                TrailBlazer
Bakersfield                       1288               05-2518                TrailBlazer
Whittier                          1289               05-2519                TrailBlazer
Treasure Coast North              1290               10-2525                TrailBlazer
Orlando                           1291               10-2511                TrailBlazer
St Petersburg                     1293               10-2519                TrailBlazer
Clearwater                        1297               10-2542                TrailBlazer
Sebring                           1301               10-2564                TrailBlazer
BMA N.E. San Antonio              1305               45-2565                TrailBlazer
BMA N. Houston                    1310               45-2574                TrailBlazer
Glendora                          1311               05-2681                TrailBlazer
BMA W. San Antonio                1316               45-2616                TrailBlazer
Vero Beach                        1317               10-2597                TrailBlazer
Phoenix                           1318               03-2503                TrailBlazer
BMA S. Plains                     1319               45-2506                TrailBlazer
BMA Bedford                       1321               45-2583                TrailBlazer
BMA Eagle Pass                    1322               45-2541                TrailBlazer
Wellington                        1337               10-2594                TrailBlazer
Inverness                         1339               10-2579                TrailBlazer
South St.Petersburg               1343               10-2547                TrailBlazer
Carolina                          1344               40-2507                TrailBlazer
Guayama                           1345               40-2509                TrailBlazer
Crystal River                     1346               10-2661                TrailBlazer
Lake City                         1347               10-2548                TrailBlazer
BMA N.E. Albuquerque              1349               32-2504                TrailBlazer
Alameda County                    1353               05-2586                TrailBlazer
Fresno                            1359               05-2677                TrailBlazer
Lantana                           1364               10-2539                TrailBlazer
Hollywood                         1367               10-2508                TrailBlazer


</TABLE>
<PAGE>

<TABLE>
<CAPTION>

<S>                               <C>              <C>            <C>
BMA S.W. Houston                  1373               45-2576                TrailBlazer
Thousand Oaks                     1383               05-2579                TrailBlazer
Ocala                             1385               10-2537                TrailBlazer
Natchitoches                      1387               19-2525                TrailBlazer
San German                        1393               40-2506                TrailBlazer
Arecibo                           1394               40-2508                TrailBlazer
Minden                            1400               19-2541                TrailBlazer
BMA Weslaco                       1401               45-2585                TrailBlazer
Chula Visata                      1402               05-2563                TrailBlazer
BMA Ennis                         1404               45-2582                TrailBlazer
Aguadilla                         1410               40-2513                TrailBlazer
Brandon                           1413               10-2584                TrailBlazer
Bradenton                         1419               10-2538                TrailBlazer
Palmetto                          1420               10-2562                TrailBlazer
Camarillo                         1423               05-2668                TrailBlazer
Greeley                           1424               06-2510                TrailBlazer
BMA S. Arlington                  1426               45-2592                TrailBlazer
BMA Central San Antonio           1427               45-2595                TrailBlazer
Jackson                           1435               25-2505                TrailBlazer
BMA Lubbock                       1444               45-2568                TrailBlazer
BMA Victoria                      1445               45-2567                TrailBlazer
Kendall                           1451               10-2522                TrailBlazer
Metropolitan Miami                1452               10-2566                TrailBlazer
Canton                            1454               25-2522                TrailBlazer
Glendale                          1455               03-2521                TrailBlazer
St. Augustine                     1461               10-2557                TrailBlazer
Gainsville East                   1467               10-2613                TrailBlazer
Rio Piedras                       1471               40-2515                TrailBlazer
Las Americas                      1472               40-2512                TrailBlazer
Port.St Lucie                     1473               10-2609                TrailBlazer
Apopka                            1474               10-2592                TrailBlazer
BMA Corsicana                     1477               45-2553                TrailBlazer
Southwest Jackson                 1483               25-2524                TrailBlazer
Carson                            1485               05-2687                TrailBlazer
BMA Clear Lake                    1489               45-2609                TrailBlazer
East Orlando                      1492               10-2619                TrailBlazer
Kansas City                       1494               26-2501                TrailBlazer
Blue Springs                      1495               26-2511                TrailBlazer
Desert Valley                     1496               03-2530                TrailBlazer
Belmont                           1565               14-2531                TrailBlazer
Bridgeport                        1566               14-2524                TrailBlazer
Loop/E. Delaware                  1567               14-2502                TrailBlazer
Evergreen                         1568               14-2545                TrailBlazer
Gurnee                            1569               14-2549                TrailBlazer
Hoffman Estates                   1570               14-2547                TrailBlazer
Lutheran General                  1571               14-2559                TrailBlazer

</TABLE>
<PAGE>

<TABLE>
<CAPTION>


<S>                               <C>              <C>             <C>
Melrose Pk                        1572               14-2554                TrailBlazer
Marquette                         1573               14-2566                TrailBlazer
Cumberland/Norridge               1574               14-2521                TrailBlazer
Rolling Meadows                   1576               14-2525                TrailBlazer
South                             1577               14-2519                TrailBlazer
South Holland                     1578               14-2542                TrailBlazer
South Shore                       1579               14-2572                TrailBlazer
Mission Hills                     1614               05-2633                TrailBlazer
Midwest City                      1615               37-2510                TrailBlazer
BMA New Braunfels                 1618               45-2626                TrailBlazer
Madison Cty                       1619               44-2550                TrailBlazer
Souwest Tennessee                 1620               44-2544                TrailBlazer
Memphis                           1624               44-2569                TrailBlazer
East Mobile                       1626               01-2524                TrailBlazer
East Arkansas                     1644               04-2528                TrailBlazer
St. Louis                         1645               26-2507                TrailBlazer
St Charles                        1646               26-2521                TrailBlazer
Southwest Illinois                1647               14-2535                TrailBlazer
BMA N.W. Bexar Cnty               1648               45-2631                TrailBlazer
Jupiter                           1649               10-2657                TrailBlazer
BMA Texas City                    1651               45-2635                TrailBlazer
BMA Mission                       1657               45-2636                TrailBlazer
Estrella                          1659               03-2537                TrailBlazer
West Ponce                        1662               40-2517                TrailBlazer
BMA S.E. San Antonio              1664               45-2638                TrailBlazer
Live Oak                          1669               10-2652                TrailBlazer
Duval                             1670               10-2662                TrailBlazer
Petaluma                          1677               05-2624                TrailBlazer
Santa Rosa                        1678               05-2524                TrailBlazer
BMA Cleburne                      1679               45-2644                TrailBlazer
Culver City                       1690               05-2544                TrailBlazer
Penn Valley                       1695               26-2538                TrailBlazer
Homestead                         1705               10-2565                TrailBlazer
West Kendall                      1706               10-2595                TrailBlazer
Ventura County                    1711               05-2656                TrailBlazer
Las Posas                         1712               05-2692                TrailBlazer
South Miami                       1713               10-2502                TrailBlazer
Coconut Grove                     1714               10-2653                TrailBlazer
Bastrop                           1735               19-2594                TrailBlazer
Univ of S. Alabama                1737               01-2559                TrailBlazer
BMA W. Bexar Cnty                 1738               45-2668                TrailBlazer
BMA Jourdanton                    1739               45-2673                TrailBlazer
BMA N.W. Houston                  1740               45-2671                TrailBlazer
BMA Liberty                       1742               45-2669                TrailBlazer
BMA Dallas South                  1746               45-2679                TrailBlazer
BMA S. Central Dallas II          1748               45-2680                TrailBlazer

</TABLE>
<PAGE>

<TABLE>
<CAPTION>


<S>                               <C>              <C>            <C>
BMA Dallas Central                1749               45-2684                TrailBlazer
BMA N.W. Dallas II                1750               45-2683                TrailBlazer
Avon Park                         1753               10-2694                TrailBlazer
East Memphis                      1775               44-2524                TrailBlazer
BMA Central Ft. Worth             1784               45-2689                TrailBlazer
Woodward                          1790               37-3506                TrailBlazer
BMA Westminster                   1801               45-2709                TrailBlazer
Concord                           1802               05-2759                TrailBlazer
Walnut Creek                      1803               05-2758                TrailBlazer
Pittsburg                         1804               05-2757                TrailBlazer
Carrollwood                       1805               10-2681                TrailBlazer
Naples                            1806               10-2534                TrailBlazer
Bonita Springs                    1807               10-2650                TrailBlazer
BMA Dallas II                     1812               45-2698                TrailBlazer
BMA Dallas East                   1813               45-2700                TrailBlazer
BMA Garland II                    1817               45-2701                TrailBlazer
BMA S. Dallas County              1818               45-2697                TrailBlazer
Gulfport                          1822               25-2540                TrailBlazer
Graceland                         1838               44-2591                TrailBlazer
N.E. Tx Dialysis Center           1872               45-2694                TrailBlazer
Swiss Ave. Dialysis Ctr.          1874               45-2693                TrailBlazer
Village II Dialysis Ctr.          1875               45-2688                TrailBlazer
Oak Cliff Dialysis Ctr.           1876               45-2691                TrailBlazer
Redbird Dialysis Ctr.             1877               45-2699                TrailBlazer
S. Oak Cliff Dialysis Ctr.        1878               45-2687                TrailBlazer
Town Gate Dialysis Ctr.           1879               45-2690                TrailBlazer
Mockingbird Dialysis Ctr.         1881               45-2501                TrailBlazer
North Memphis                     1891               44-2593                TrailBlazer
Preferred Dialysis Mgmt.          1893               29-2507                TrailBlazer
West Boca                         1908               10-2582                TrailBlazer
BMA Cliffview                     1909               45-2674                TrailBlazer
Palatka                           1912               10-2676                TrailBlazer
El Centro                         1917               05-2690                TrailBlazer
Berkeley                          1920               05-2651                TrailBlazer
BMA West Texas                    1921               45-2604                TrailBlazer
North Phx                         1923               03-2550                TrailBlazer
Starke                            1924               10-2668                TrailBlazer
Parker                            1926               03-2522                TrailBlazer
Flagstaff                         1927               03-2524                TrailBlazer
Salt River                        1928               03-2529                TrailBlazer
Winslow                           1929               03-2536                TrailBlazer
QCDC St Louis                     1947               26-2528                TrailBlazer
Dallas/QCDC                       1952               45-2621                TrailBlazer
University Kidney Ctr.            1953               45-2603                TrailBlazer
North Coast                       1954               05-2708                TrailBlazer
Florida Ins.for Peritoneal        1973               10-2643                TrailBlazer

</TABLE>
<PAGE>

<TABLE>
<CAPTION>


<S>                               <C>              <C>            <C>
Hillcrest                         1981               05-2500                TrailBlazer
National City                     1982               05-2536                TrailBlazer
Chula Vista South                 1984               05-2653                TrailBlazer
N. Chicago/W. Belmont             2022               14-2523                TrailBlazer
Evanston                          2044               14-2511                TrailBlazer
Niles                             2052               14-2500                TrailBlazer
Morningstar                       2295               37-2537                TrailBlazer
Milwaukee South                   1082               52-2516          United Government Svcs.
Kempsville                        1083               49-2567          United Government Svcs.
Alexandria                        1132               49-2505          United Government Svcs.
Roanoke                           1133               49-2513          United Government Svcs.
Norfolk                           1135               49-2502          United Government Svcs.
Suffolk                           1195               49-2530          United Government Svcs.
Ann Arbor                         1253               23-2502          United Government Svcs.
Northeast  Wisconsin              1257               52-2500          United Government Svcs.
Livonia                           1263               23-2501          United Government Svcs.
Detroit                           1265               23-2500          United Government Svcs.
North Arlington                   1275               49-2515          United Government Svcs.
Fairfax                           1277               49-2504          United Government Svcs.
Fredericksburg                    1311               49-2508          United Government Svcs.
Martinsburg                       1331               51-2502          United Government Svcs.
Smyth County                      1340               49-2510          United Government Svcs.
New River Valley                  1361               49-2532          United Government Svcs.
North Roanoke                     1397               49-2548          United Government Svcs.
Charleston                        1398               51-2503          United Government Svcs.
Eastern Virginia                  1441               49-2538          United Government Svcs.
Bluefield                         1458               51-2501          United Government Svcs.
Dulles                            1488               49-2540          United Government Svcs.
Richmond                          1601               49-2519          United Government Svcs.
West End                          1602               49-2503          United Government Svcs.
Warrenton                         1603               49-2525          United Government Svcs.
Tappahanock                       1604               49-2536          United Government Svcs.
Adrian                            1605               23-2514          United Government Svcs.
Madison Heights                   1637               23-2525          United Government Svcs.
Owosso                            1663               23-2522          United Government Svcs.
Flint                             1667               23-2521          United Government Svcs.
Morgantown                        1680               51-2506          United Government Svcs.
Milwaukee South                   1685               52-2510          United Government Svcs.
Northwest Indianapolis            1686               23-2526          United Government Svcs.
Appleton                          1689               52-2514          United Government Svcs.
Oshkosh                           1696               52-2518          United Government Svcs.
Great Lakes                       1727               23-2533          United Government Svcs.
Farmville                         1797               49-2526          United Government Svcs.
St. Clair Shores                  1946               23-2517          United Government Svcs.
Mt. Vernon/QCDC                   1949               49-2557          United Government Svcs.
Norfolk Community Hosp.           1995               49-2585          United Government Svcs.
Crystal Springs                   2091               49-2570          United Government Svcs.
</TABLE>







<PAGE>

                                                                    EXHIBIT 10.6

                                                      U.S. Department of Justice


                                            United States Attorney
                                            District of Massachusetts


Main Reception: (617) 748-3100              United States Courthouse, Suite 9200
                                            1 Courthouse Way
                                            Boston, Massachusetts  02210

                                        January 13, 2000

BY HAND

Jonathan Chiel                        Jeffrey E. Stone
Choate, Hall & Stewart                McDermott, Will & Emery
Exchange Place                        227 West Monroe Street
53 State Street                       Chicago, IL 60606-5096
Boston, MA 02109-2891

Alan E. Reider, Esq.                  Harold Damelin
Breckinridge L. Willcox               Powers, Pyles, Sutter & Verville
Arent, Fox, Kintner, Plotkin & Kahn   Twelfth Floor
1050 Connecticut Avenue, NW           1875 Eye Street, NW
Washington, D.C. 20036                Washington, DC 20006-5409

Re:  LIFECHEM, INC.
     --------------

Dear Gentlemen:

     This letter sets forth the Agreement between the United States Department
of Justice and the United States Attorney for the District of Massachusetts
(collectively the "United States"), and your client, LIFECHEM, INC.,
("LIFECHEM"), a Delaware corporation, (collectively referred to as "the
Parties") as follows:

     1.   Guilty Plea
          -----------

     On or before January 19, 2000, or such other date as the Court may set,
LIFECHEM shall waive indictment and plead guilty to Count Two of the Information
attached hereto as Exhibit A, which charges LIFECHEM with a conspiracy to
defraud the United States and one of its agencies, the Health Care Financing
Administration, through the submission of false, fictitious and fraudulent
claims to the Medicare Program, in violation of 18 U.S.C. Section 286.

                                       1
<PAGE>

     2.   Sentencing Guidelines
          ---------------------

     The United States and LIFECHEM agree that the following provisions of the
United States Sentencing Guidelines ("U.S.S.G.") apply to sentencing of LIFECHEM
with respect to Count Two of the Information:

          (a)  pursuant to U.S.S.G. (S) 8C2.4(a), the loss to the United States
               from this offense for criminal sentencing purposes is
               $22,900,000;

          (b)  pursuant to U.S.S.G. (S) 8C2.5, the culpability score is 7,
               calculated as follows:

                    (1)  base score of 5 pursuant to (S) 8C2.5(a);

                    (1)  add 4 points pursuant to (S) 8C2.5(b)(2)(A)(i) and
                         (ii);

                    (1)  deduct 2 points pursuant to (S) 8C2.5(g)(2).

          (c)  pursuant to (S) 8C2.6, the applicable range for a multiplier is
               1.4 to 2.8, and the appropriate multiplier to be applied as to
               LIFECHEM is 1.6.

          (d)  the Parties agree that there is no basis for a departure under
               the Sentencing Guidelines, either upward or downward.

     3.   Agreed Disposition
          ------------------

     The United States and LIFECHEM agree pursuant to Fed. R. Crim. P.
11(e)(1)(C) that the following sentence is the appropriate disposition of Count
Two of the Information:

          (a)  a criminal fine in the amount of thirty six million six hundred
               forty thousand dollars, ($36,640,000) to be paid as follows:

               (1)  an amount of eighteen million one hundred five thousand
                    dollars ($18,105,000) shall be paid within 15 days of
                    sentencing;

               (2)  an amount of nine million two hundred sixty seven thousand
                    dollars ($9,267,000) shall be paid on or before April 16,
                    2001; and

               (3)  an amount of nine million two hundred sixty seven thousand
                    dollars ($9,267,000) shall be paid on or before July 16,
                    2001.

                                       2
<PAGE>

          (b)  a mandatory special assessment of $400 pursuant to 18 U.S.C. (S)
               3013, which shall be paid to the Clerk of Court on or before the
               date of sentencing.

LIFECHEM acknowledges that it is obligated, pursuant to 18 U.S.C. (S) 3612(f),
to pay interest on that portion of the fine which is not paid on or before the
fifteenth day after the Court enters judgment in this matter.

     In light of the pending civil action, United States ex rel. Jay A. Buford,
                                           ------------------------------------
et al. v. LIFECHEM, Inc., et al., Civil Action No. 95-10742-NG (D. Mass.), and
- --------------------------------
the settlement agreement between LIFECHEM, INC. and others and the United States
relating to the civil action which is being signed contemporaneous with this
Plea Agreement (the "civil Settlement Agreement"), the parties agree the
complication and prolongation of the sentencing process that would result from
an attempt to fashion a proper restitution order outweighs the need to provide
restitution to the victims in this case, where, as here, the loss suffered by
each of the federal health care programs will be recompensed from amounts paid
as part of the civil Settlement Agreement.  See, 18 U.S.C. (S)
                                            ---
3663(a)(1)(B)(ii).  Therefore, the United States agrees that it will not seek a
separate restitution order as to LIFECHEM as part of the resolution of Count Two
of the Information.

     4.   No Further Prosecution of Defendant
          -----------------------------------

     The United States agrees that, other than the charge in Count Two of the
attached Information, it shall not further prosecute LIFECHEM for conduct which
(a) falls within the scope of the conspiracy which is charged in Count Two of
the Information; (b) was within the scope of the grand jury investigation
conducted by the U.S. Attorney; or (c) was known to the U.S. Attorney prior to
the date of execution of this letter.

     The U.S. Attorney expressly reserves the right to prosecute any individual,
including but not limited to present and former officers, directors, employees
and agents of LIFECHEM, in connection with the conduct encompassed by this Plea
Agreement or within the scope of the grand jury investigation.

     5.   Probation Department Not Bound By Agreement
          -------------------------------------------

     The Parties acknowledge that the disposition agreed upon by the Parties and
their calculations under the Sentencing Guidelines are not binding upon the
United States Probation Office.

     6.   Fed. R. Crim. P. 11(e)(1)(C) Agreement
          --------------------------------------

     LIFECHEM's plea shall be tendered pursuant to Fed. R. Crim. P. 11(e)(1)(C).
LIFECHEM cannot withdraw its plea of guilty unless the sentencing judge rejects
this Plea Agreement.  If the sentencing judge rejects the guilty plea, this Plea
Agreement shall be null and void at the option of either the United States or
LIFECHEM, except as set forth in Paragraph 8

                                       3
<PAGE>

below. If LIFECHEM's guilty plea is withdrawn on LIFECHEM's motion for any
reason, this Plea Agreement shall be null and void at the option of the U.S.
Attorney, except as set forth in Paragraph 8 below.

     7.   Civil and Administrative Liability
          ----------------------------------

     By entering into this Plea Agreement, the United States does not compromise
any civil or administrative liability, including but not limited to any False
Claims Act or tax liability, which LIFECHEM may have incurred or may incur as a
result of its conduct and its plea of guilty to Count Two of the Information.

     8.   Waiver of Defenses
          ------------------

     In the event that LIFECHEM's guilty plea is not accepted by the Court for
whatever reason, or is later withdrawn for whatever reason, LIFECHEM hereby
waives, and agrees not to interpose, any defense to any charges brought against
it which it might otherwise have under any statute of limitations or the Speedy
Trial Act, except any such defense that LIFECHEM may already have for conduct
occurring before March 1, 1994, if charges are filed within 90 days of the date
on which such guilty plea is rejected or withdrawn.

     9.   Breach of Agreement
          -------------------

     If the United States Attorney determines that LIFECHEM has failed to comply
with any provision of this Plea Agreement, or has committed any crime between
the date of this letter and the date of sentencing in this matter, the United
States may, at its sole option, be released from its commitments under this Plea
Agreement in their entirety by notifying LIFECHEM, through counsel or otherwise,
in writing.  The United States may also pursue all remedies available under the
law, irrespective of whether it elects to be released from its commitments under
this Plea Agreement.  LIFECHEM recognizes that no such breach by LIFECHEM of any
obligation under this Plea Agreement shall give rise to grounds for withdrawal
of its guilty plea.  LIFECHEM understands that, should it breach any provision
of this Plea Agreement, the United States will have the right to use against
LIFECHEM before any grand jury, at any trial or hearing, or for sentencing
purposes, any statements which may be made by LIFECHEM, and any information,
materials, documents or objects which may be provided by it to the government
subsequent to this Plea Agreement, without any limitation.

     10.  Corporate Authorization
          -----------------------

     LIFECHEM shall provide to the United States and the Court a certified copy
of a resolution of the Board of Directors of LIFECHEM, affirming that the Board
of Directors has authority to enter into the Plea Agreement and has (1) reviewed
the Information in this case and the proposed  Plea Agreement; (2) consulted
with legal counsel of LIFECHEM's choice in connection with the matter; (3) voted
to enter into the proposed Plea Agreement; (4) voted to authorize LIFECHEM to
plead guilty to Count Two of the attached Information; and (5) voted to
authorize the corporate officer identified below to execute the Plea Agreement
and all other documents necessary to carry out the provisions of the Plea
Agreement. LIFECHEM agrees that

                                       4
<PAGE>

counsel identified below will appear on behalf of LIFECHEM and enter the guilty
plea and will also appear for the imposition of sentence.

     11.  Who Is Bound By Agreement
          -------------------------

     This Plea Agreement binds LIFECHEM and the United States Department of
Justice, including each of its United States Attorney's Offices, and can not and
does not bind the Tax Division of the U.S. Department of Justice, the Internal
Revenue Service of the U.S. Department of Treasury, or any other federal, state
or local prosecutive authority.

     12.  Complete Agreement
          ------------------

     With regard to the disposition of Count Two of the attached Information,
this Plea Agreement is the complete and only agreement between the Parties.  No
promises, representations, agreements or conditions have been entered into other
than those set forth in this letter in connection with Count Two.  This Plea
Agreement supersedes prior understandings, if any, of the parties, whether
written or oral in connection with the disposition of Count Two.  This Plea
Agreement can be modified or supplemented only in a written memorandum signed by
the Parties or on the record in court.

     If this letter accurately reflects the Agreement entered into between the
United States and your client LIFECHEM, INC., please sign the Acknowledgment of
Plea Agreement below, provide evidence of the requisite authorization to enter
into this Plea Agreement, and return the original of this letter to Assistant
U.S. Attorneys Susan G. Winkler and Susan Hanson-Philbrick.

                                        Very truly yours,



                                   By: /s/ Mark W. Pearlstein
                                       -------------------------------------
                                       MARK W. PEARLSTEIN
                                       Acting United States Attorney
                                       District of Massachusetts



                                   By:  /s/ John Keeney (mwp)
                                        ------------------------------
                                        JOHN C. KEENEY
                                        Deputy Assistant Attorney General
                                        Criminal Division
                                        Department of Justice

                                       5
<PAGE>

                   CORPORATE ACKNOWLEDGMENT OF PLEA AGREEMENT
                   ------------------------------------------

     The Directors of LIFECHEM, INC. have read this Plea Agreement and the
attached criminal Information, in their entirety, and have discussed this matter
with legal counsel of the corporation's choosing, including undersigned counsel.
As set forth in the attached resolution, the Board of Directors has authorized
me, as an officer of the corporation, to enter into this Plea Agreement on
behalf of the corporation.  I hereby acknowledge, on behalf of LIFECHEM, INC.,
that this letter fully sets forth LIFECHEM's agreement with the U.S. Attorney
relating to the disposition of Count Two of the attached Information, and that
no additional promises or representations have been made to the corporation by
any official of the United States in connection with the disposition of that
charge.  LIFECHEM, Inc. is entering into this Agreement freely, voluntarily and
knowingly because it is guilty of the offense set forth in Count Two of the
Information and it believes this Plea Agreement is in its best interest.


Dated: 1/18/00                /s/ Ben J. Lipps
                              ----------------------------
                              Ben J. Lipps
                              President, LIFECHEM, INC.


Dated: January 18, 2000       /s/ Jonathan Chiel
                              ----------------------------
                              Jonathan Chiel
                              Choate, Hall & Stewart


Dated: 1/18/000               /s/ Alan E. Reider
                              -----------------------------
                              Alan E. Reider
                              Arent, Fox, Kintner, Plotkin & Kahn


Dated: 1/18/000               /s/ Breckinridge L. Willcox
                              -----------------------------
                              Breckinridge L. Willcox
                              Arent, Fox, Kintner, Plotkin & Kahn


Dated: January 18, 2000       /s/ Jeffrey E. Stone
                              -----------------------------
                              Jeffrey E. Stone
                              McDermott, Will & Emery


Dated: 1/18/2000              /s/ Harold Damelin
                              -----------------------------
                              Harold Damelin
                              Powers, Pyles, Sutter & Verville

                              Attorneys for LIFECHEM, INC.

                                       6
<PAGE>

                                   EXHIBIT A
                                   ---------

                         UNITED STATES DISTRICT COURT
                           DISTRICT OF MASSACHUSETTS

UNITED STATES OF AMERICA         )
                                 ) No.
v.                               )
                                 ) 18 U.S.C. (S)371 (Conspiracy)
NMC HOMECARE, INC.;              ) 18 U.S.C. (S)286 (Conspiracy)
LIFECHEM, INC.; and              )
NMC MEDICAL PRODUCTS, INC.       )
                                 )
               Defendants.       )


                                  INFORMATION
                                  -----------

     The United States Attorney alleges that:

                              General Allegations
                              -------------------

     At all times material to this Information, unless otherwise alleged:

     1.   National Medical Care, Inc. (NMC) was a Delaware corporation engaged
in the kidnedialysis business throughout the United States. From prior to 1990
to October 1, 1996 NMC was headquartered in Waltham, MA, and a wholly-owned
subsidiary of W.R. Grace & Co. On or about October 1, 1996 NMC, W.R. Grace & Co.
and Fresenius AG, a German corporation, underwent a reorganization in which NMC
became a wholly-owned subsidiary of Fresenius Medical Care Holdings, Inc., an
indirect subsidiary of Fresenius AG. Thereafter, the business of NMC was
conducted under the name Fresenius Medical Care, North America, from offices
headquartered in Lexington, MA.

     1.   During most of the period charged in this
<PAGE>

Information, NMC conducted its business through three principal divisions.
Dialysis Services Division ("DSD") operated over 300 kidney dialysis centers
located throughout the United States and provided dialysis services to over
30,000 patients. Medical Products Division manufactured and distributed kidney
dialysis products, including dialyzers, bloodlines and dialysis solutions, to
NMC owned dialysis facilities and independent dialysis facilities. Medical
Products Division also operated a clinical blood testing laboratory, known as
LIFECHEM, which specialized in blood testing for kidney dialysis patients. The
Homecare Division sold infusion therapies, respiratory therapies and durable
medical equipment, primarily to patients in the home setting.

     1.   NMC owned and operated dialysis facilities which were often named
"Bio-Medical Applications of (the name of the community where the facility was
located)," and were frequently referred to as "BMAs." Within NMC, independent
dialysis facilities, not owned or operated by NMC, were frequently referred to
as "non-BMAs."

     1.   NMC Homecare, Inc., ("NMC Homecare"), a defendant herein, was a
Delaware corporation and a wholly owned subsidiary of NMC, with a principal
place of business of Waltham, MA.

     1.   NMC Medical Products, Inc. ("MPD"), a defendant herein, was a Delaware
corporation and a wholly owned subsidiary of NMC, with a principal place of
business of Rockleigh, New Jersey. MPD was formerly known as National Medical
Care Medical Products
<PAGE>

Division, Inc., and before that, as Erika, Inc.

     6.   LIFECHEM, INC. ("LIFECHEM"), a defendant herein, was a Delaware
corporation, headquartered in Northvale, N.J. and a subsidiary of NMC, which
operated clinical blood testing laboratories in Northvale, N.J. and Woodland
Hills, CA.

                             The Medicare Program
                             --------------------
     7.   The Medicare program ("Medicare") was a United States government
benefit program, created by Title XVIII of the Social Security Act of 1965, that
paid for certain medical services for persons 65 years of age and older and
certain other persons.

     8.   The Health Care Financing Administration ("HCFA") was an agency of the
United States Department of Health and Human Services ("HHS"), which was
responsible for the administration of the Medicare program.

     9.   Medicare was divided into two parts, A and B. In general, Part A paid
for covered medical services provided to eligible beneficiaries in hospitals.
Part B, in general, paid for covered physician services, and other covered goods
and services, provided to eligible beneficiaries outside of the hospital
setting.

     10.  HCFA designated certain health insurance companies, known as Fiscal
Intermediaries ("FIs"), to process claims for Medicare Part A benefits. HCFA
designated certain other health insurance companies, known as carriers, to
process claims for Medicare Part B benefits.

     11.  It was a basic tenet of Medicare coverage that Medicare would
reimburse only for covered goods or services, provided to

                                       3
<PAGE>

an eligible beneficiary, which were medically necessary for the diagnosis or
treatment of illness or injury.

                           The Medicare ESRD Program
                           -------------------------

     12.  End Stage Renal Disease (ESRD) was an irreversible and permanent
impairment of kidney function requiring dialysis or kidney transplantation to
sustain life. The most common form of dialysis, hemodialysis, typically involved
treatments three times per week, in which the patient's blood was removed from
the body, passed through a dialysis machine to remove impurities and toxins, and
then returned to the patient's body.

     13.  In or about July 1, 1973 Medicare coverage was extended to certain
persons suffering from ESRD, without regard to their age. In general, Medicare
paid eighty percent (80%) of the Medicare allowable amount for covered services
needed by ESRD patients.

     14.  Medicare established a composite rate to cover the costs of equipment,
supplies, certain blood laboratory tests and other services associated with
dialysis treatments at independent dialysis facilities. Medicare paid 80 percent
of the composite rate directly to the facility for each dialysis treatment
provided to an eligible ESRD patient.

     15.  Medicare also established a monthly capitation rate to cover the cost
of physician outpatient services relating to the care of an eligible patient for
ESRD. Medicare paid 80 percent of the capitation rate for the physician's
services relating to eligible dialysis patients.

                                    CHAMPUS
                                    -------

                                       4
<PAGE>

     16.  The Civilian Health and Medical Program of the Uniform Service
("CHAMPUS") was a health insurance program, administered by the United States
Department of Defense, to provide health insurance to retired military personnel
and the civilian dependents of active duty, retired and deceased military
personnel.

                                       5
<PAGE>

COUNT ONE   (18 U.S.C. (S)371 Conspiracy to Defraud the United States relating
- ---------
             to IDPN)

     17.  The allegations contained in paragraphs 1 to 4 and 7 to 15 are
incorporated herein and realleged as if set forth in full.

     18.  One of the products which NMC Homecare sold was intradialytic
parenteral nutrition ("IDPN"), a nutrition therapy which was provided
intravenously to dialysis patients during their dialysis treatments. IDPN was
one of the most profitable products which NMC Homecare sold and in some of the
years IDPN accounted for virtually all of the profits of NMC Homecare. Medicare
was NMC Homecare's principal source of reimbursement for IDPN.

     19.  Medicare reimbursed for IDPN under the prosthetic device benefit
provision of the Social Security Act. Pursuant to a 1984 National Coverage
Determination, parenteral and enteral nutrition (PEN) therapies, including IDPN,
were a covered Medicare service only if the patient suffered from a severe
pathology of the alimentary tract which did not allow absorption of sufficient
nutrients to maintain weight and strength commensurate with the patient's
general condition. For IDPN to be a covered service, Medicare also required that
(1) the patient's impairment be permanent, meaning it was expected to last for
at least 90 consecutive days; (2) the therapy be ordered, by a physician, in
writing; and (3) the claim be supported by sufficient medical documentation to
permit an independent conclusion that the requirements of Medicare's prosthetic
device benefit were satisfied.

                                       6
<PAGE>

19.       Medicare did not cover IDPN if it was supplemental nutrition, even if
it was prescribed by a physician to treat malnutrition.

19.       NMC Homecare provided IDPN to patients in both BMAs and non-BMAs. NMC
Homecare was the exclusive supplier of IDPN to patients in BMAs, but had to
compete with other IDPN suppliers to provide IDPN to patients at non-BMAs.

19.       NMC Homecare employed IDPN Coordinators to market IDPN. IDPN
Coordinators were usually Registered Nurses ("RNs") or Renal Dieticians who were
assigned a designated geographic territory. IDPN Coordinators called on dialysis
facilities within their territory, both BMAs and non-BMAs; promoted the use of
IDPN; assessed whether patients were candidates for IDPN; prepared paperwork
relating to the billing for IDPN; and negotiated IDPN contracts with non-BMAs.
IDPN Coordinators were paid a base salary, plus a commission for each patient
they put on service for IDPN.

19.       NMC Homecare maintained a Clinical Reimbursement Department which was
responsible for training IDPN Coordinators, reviewing documentation relating to
IDPN billing, monitoring Medicare policies and practices relating to IDPN
reimbursement, and appealing denied IDPN claims.

19.       NMC Homecare usually paid an administration fee, bag fee or hang fee
("hang fee") to the dialysis facility in

                                       7
<PAGE>

connection with the administration of IDPN. This hang fee purported to
compensate the dialysis facility for the services and resources it devoted to
managing and administering IDPN. NMC Homecare's standard hang fee rate was $30
for each bag of IDPN administered. NMC Homecare paid its standard hang fee to
the BMAs, and a majority of the non-BMAs, throughout the conspiratorial period
alleged in this count. NMC Homecare paid hang fees in excess of $30 per bag to
80 non-BMAs, more or less, for various portions of the conspiratorial period
alleged in this count.

19.       Beginning in or about February, 1992 and continuing until at least in
or about November, 1995 NMC Homecare purported to use an IDPN Administration Fee
Calculation Tool ("calculation tool") to justify hang fees in excess of $30 per
bag. The calculation tool purported to calculate the amount of time, on average,
which various members of the dialysis facility staff spent on managing or
administering IDPN, and then multiplied the time, by average wage rates, to
calculate an average cost per IDPN treatment.

19.       Throughout the period charged in this Information, calculation tools
were not, in fact, used to determine the amount of the hang fee which NMC
Homecare would pay to a non-BMA. Those amounts were determined primarily by the
level of competition which existed for the IDPN business of the non-BMA, the
potential volume of IDPN business at issue, and the amount NMC Homecare believed
was necessary to obtain or maintain the non-BMA's IDPN

                                       8
<PAGE>

business. In many instances, when NMC Homecare paid a hang fee to a non-BMA in
excess of $30 per bag, NMC Homecare simply ignored its purported calculation
tool requirement, or it obtained a sham calculation tool which did not reflect
the non-BMA's true costs. NMC Homecare did not establish procedures to review
calculation tools to insure they reflected a non-BMA's true costs.

19.       NMC Homecare usually submitted a claim for reimbursement to Medicare
monthly for each Medicare beneficiary on IDPN. Claims were submitted on form
HCFA 1500, or its electronic equivalent, and separate reimbursement was provided
for (1) the IDPN solution; (2) lipids, if administered; (3) rental of a pole;
(4) rental of an infusion pump; and (5) an administration kit, which covered the
disposable supplies used to administer IDPN.

19.       Blue Cross Blue Shield of South Carolina ("BC/BS of SC") was the
carrier that processed virtually all of NMC Homecare's IDPN claims during the
period May, 1988 to December, 1993. Beginning in or about January, 1994 Medicare
transferred responsibility for processing IDPN claims to four Durable Medical
Equipment Regional Carriers ("DMERCs"), known as DMERCs A, B, C and D.

19.       Medicare required that each IDPN claim be supported by a Certificate
of Medical Necessity ("CMN"), signed by physician, indicating that in the
physician's opinion the supplies and

                                       9
<PAGE>

equipment were medically necessary and the physician would be supervising the
patient's treatment. Medicare required an initial certification, for a three
month period, followed by subsequent recertifications for varying periods of
time. Medicare also required a recertification whenever there was a change in
the patient's IDPN prescription.

19.       Medicare also required that each IDPN claim be supported by sufficient
medical documentation to demonstrate that the prosthetic device benefit was
satisfied. In or about the Fall of 1988 NMC Homecare developed the IDPN
Information Sheet ("IIS form") to document the medical condition of Medicare
beneficiaries. The format of the IIS form was approved by BC/BS of SC. In 1994,
when Medicare transferred IDPN claims processing to the DMERCs, NMC Homecare
renamed the IIS form the Clinical Nutrition Summary ("CNS"). IIS and CNS forms
were used to meet Medicare's medical documentation requirement relating to IDPN.

19.       Throughout the period charged in this Information, NMC Homecare's IDPN
Coordinators typically drafted an IIS or CNS form for each new Medicare IDPN
patient and submitted it to the Clinical Reimbursement Department for review and
comment. Thereafter, the IIS or CNS form was typed in final form and a CMN was
prepared, using the IIS or CNS form. Both the IIS/CNS form and the CMN were
submitted to the patient's physician for signature. Most physicians signed
IIS/CNS and CMN forms without making any changes in them. Thereafter, the
IIS/CNS and CMN forms were returned to NMC Homecare and used as the basis for

                                      10


<PAGE>

billing IDPN to Medicare. On some occasions the IIS/CNS form was submitted to
Medicare to substantiate a patient's medical condition. On other occasions, the
IIS/CNS form served as the source document for an electronic claim summary which
was transmitted to Medicare in support of the IDPN claim.

19.       If a Medicare IDPN claim was denied, there were three levels of review
available to NMC Homecare. The first level, known as Informal Review, was
conducted by carrier personnel, who essentially gave the claim a second look.
The next level, known as a carrier Fair Hearing ("FH"), was conducted either in
person or by phone, and resulted in a formal written decision. The third level
of review involved the submission of the disputed claim to an independent
Administrative Law Judge ("ALJ").

                                The Conspiracy
                                --------------
          33.  Beginning in or about May 1988, and continuing until at least
June 1996, the exact dates being unknown to the United States Attorney, in the
District of Massachusetts and elsewhere, the defendant herein,

                              NMC HOMECARE, INC.,

did knowingly, willfully and unlawfully combine, conspire, confederate and agree
with others, known and unknown, to defraud the United States, by impeding,
impairing, obstructing and defeating the lawful governmental function of various
departments and agencies of the United States, including particularly HHS and
HCFA, in the implementation, execution and administration of the Medicare
program, including particularly Medicare's PEN benefit.

                                      11
<PAGE>

     34.  The conspiracy consisted essentially of an unlawful agreement and
understanding among the defendant and the co-conspirators:

          (a)  to submit claims to Medicare for reimbursement for
IDPN, based on false, fraudulent and misleading statements and material
omissions, relating to the beneficiary's medical condition and eligibility for
coverage;

          (b) to submit claims to Medicare for reimbursement for
IDPN administration kits, based on false statements relating to the number of
kits actually used; and

          (c) to offer and pay hang fees, educational grants and
other remuneration to dialysis facilities and others, for the purpose of
inducing IDPN referrals which were paid for, in part, by Medicare.

35.       Pursuant to this unlawful conspiracy, the United States paid NMC
Homecare in excess of $110 million for improper Medicare IDPN claims.

                               Manner and Means
                               ----------------

     The manner and means by which NMC Homecare and the co-conspirators formed
and carried out the conspiracy included, among other things, the following:

            False and Misleading Statements and Material Omissions
            ------------------------------------------------------

35.       In or about 1989, NMC Homecare organized an IDPN Task Force to prepare
paperwork required to bill old, previously unbilled or denied, IDPN claims. Many
of the patients to whom

                                      12
<PAGE>

these claims related were placed on IDPN without the clinical indications
mandated by Medicare. When it was discovered that documentation relating to the
medical condition of many of these patients was missing, NMC Homecare instructed
the Task Force to use "clinical creativity" in preparing IIS and CMN forms for
these patients. Pursuant to these instructions, IIS and CMN forms were prepared
and filed with Medicare, which contained false, fictitious and misleading
information, material omissions and statements which were not supported in the
patient's medical records.

35.       It was the policy and practice of NMC Homecare to prepare IIS, CNS and
CMN forms which contained false, misleading, unsupported and inaccurate
information relating to the patient's medical condition. IDPN Coordinators were
instructed to list GI diagnoses which were historical, as opposed to currently
active conditions, without indicating that the condition was historical. IDPN
Coordinators were told to list weight loss and low serum albumin scores as
evidence of GI malabsorption problems, and omit other causes of weight loss and
low albumin, such as alcoholism, AIDS, depression, anorexia, lack of appetite
and recent hospitalizations. IDPN Coordinators were instructed to list GI
symptoms, such as nausea, vomiting or diarrhea, as indications of malabsorption,
while omitting and concealing other causes for these symptoms, such as uremia
due to inadequate dialysis or the side effects of medications.

35.       It was the policy and practice of NMC Homecare to instruct its IDPN
Coordinators that when no GI diagnosis existed

                                      13
<PAGE>

in a patient's medical records, the IDPN Coordinator could infer, from symptoms,
the diagnoses of Malabsorption Syndrome, Uremic Malabsorption, Protein Calorie
Malabsorption, or Gastroparesis, without disclosing to Medicare that these
diagnoses had been inferred by NMC Homecare.

35.       IDPN Coordinators listed false and fictitious information on IIS, CNS,
and CMN forms submitted to Medicare, including diagnoses and GI symptoms the
patient did not have, medications the patient was not taking, weight losses the
patient had not suffered and blood lab values which were not accurate.

35.       It was the policy and practice of NMC Homecare to always assert on
IIS/CNS forms that the patient's GI impairment was expected to be of permanent
duration (at least 90 days), that all medications taken to treat GI symptoms had
been unsuccessful, and that IDPN would be life sustaining, even when these
statements were false.

35.       It was the policy and practice of NMC Homecare to exaggerate,
embellish and misrepresent patients' GI symptoms, such as nausea, vomiting and
diarrhea. IDPN Coordinators were encouraged by the Clinical Reimbursement
Department to use adjectives, such as chronic, persistent, or intractable, when
these terms did not accurately reflect the patient's condition and to list
frequencies and durations for symptoms which were false.

35.       It was the policy and practice of NMC Homecare to misrepresent the
medications which patients had received to control GI symptoms, including
listing medications which had not

                                      14
<PAGE>

been prescribed; listing medications which were prescribed as PRN (as needed)
but had not in fact been used; and misrepresenting the time period medications
had been tried and the medication's effect on the symptom.

35.       It was the policy and practice of NMC Homecare to misrepresent the
patient's blood laboratory values relating to nutrition, including serum albumin
and total protein. IDPN Coordinators were instructed that the IIS/CNS forms
should show declining lab values, with scores below the normal range. The
Clinical Reimbursement Department told IDPN Coordinators they should omit lab
values which showed an improving nutritional state. IDPN Coordinators listed
false and fictitious lab values on IIS, CNS and CMN forms, transposed lab values
to make them appear to be in a declining pattern, and omitted lab values to
conceal a patient's improved nutritional status.

35.       It was the policy and practice of NMC Homecare to misrepresent the
patient's weight and weight history on IIS, CNS and CMN forms. IDPN Coordinators
sometimes listed false weight losses and false usual body weights ("UBWs"). IDPN
Coordinators were encouraged to show declining weights over time and to ignore
and conceal weight gain. IDPN Coordinators asserted on IIS/CNS forms that weight
loss was due to nausea, vomiting or diarrhea, or the inability to ingest, retain
or absorb nutrients, and concealed and failed to disclose that the weight loss
was due to amputations, hospitalizations, depression, infections, other
catabolic stresses, failure to eat or lack of someone to prepare

                                      15
<PAGE>

food.

35.       It was NMC Homecare's policy and practice to make false, fictitious,
misleading and unsupported statements on IIS, CNS and CMN forms regarding
patient's dietary intake and fluid restrictions. IDPN Coordinators listed
dietary intake and fluid restrictions which were false, fictitious, unsupported
in the patient's medical records or not representative of the patient's usual
condition. IDPN Coordinators also falsely asserted patients were unable to
maintain dietary intake due to nausea or vomiting, when, in fact, their medical
records showed they were not eating due to depression, lack of appetite or the
dislike of hospital food.

35.       It was NMC Homecare's policy and practice to list false, fictitious
and misleading information on IIS, CNS and CMN forms relating to enteral trials.
IDPN Coordinators falsely listed specific enteral supplements as having been
tried, when they had not been used; and listed supplements as having been tried
and been unsuccessful, when the supplement was not prescribed until at or about
the time the IDPN was ordered. IDPN Coordinators were told never to list on
IIS/CNS forms that the reason why enteral supplements were unsuccessful was
because the patient disliked the taste, or could not afford to purchase the
supplement, even if these reasons were the true cause.

35.       NMC Homecare often put false, fictitious and misleading information on
CMN forms including information about the patient's weight, whether the patient
was on other therapies or

                                      16


<PAGE>

treatments that may affect the patient's nutritional needs, diagnoses, GI
symptoms, weight loss and GI impairment. NMC Homecare often prepared CMN forms
for re-certification periods using outdated and inaccurate information, but
nonetheless representing to Medicare that this information applied to the re-
certification period.

35.       In connection with appeals of denied IDPN claims, NMC Homecare made
false, fictitious and fraudulent statements and material omissions to carrier
personnel, in connection with Informal Reviews and Fair Hearings, and to
Administrative Law Judges, in connection with ALJ appeals. In appealing denied
IDPN claims, NMC Homecare would typically continue to rely on IIS, CNS and CMN
forms which contained false, fictitious and fraudulent statements, and material
omissions. It would also attempt to supplement the record with selective
portions of the patient's medical records which purported to support findings of
GI impairment and malabsorption, while ignoring, and not submitting, other
portions of the medical record which contradicted or undercut such findings. On
some occasions NMC Homecare would withdraw claims from appeal at the FH or ALJ
level, because it had concluded the patient did not meet Medicare coverage
criteria. When it did so, NMC Homecare would fail to repay to Medicare funds it
had received relating to that patient, on other IDPN claims for other dates of
service.

                   False Billing of IDPN Administration Kits
                   -----------------------------------------

35.       In or about February 1991 BC/BS of SC issued a

                                      17
<PAGE>

Medicare Advisory to NMC Homecare and other IDPN suppliers indicating that when
billing for IDPN administration kits, procedure code B 4224, suppliers must bill
for the total number of actual days used, instead of a one month supply kit. NMC
Homecare had been billing for a one month supply kit, even though IDPN was
administered only 12 or 13 times per month to patients who received IDPN
throughout the month. Upon receiving the Medicare Advisory, NMC Homecare's
billing center personnel initiated steps to comply with this Medicare Advisory.

35.       NMC Homecare's senior officers realized that this Medicare Advisory
would reduce NMC Homecare's revenue on IDPN administration kits by $360 per
patient per month. NMC Homecare's senior officers instructed the billing center
not to implement the February 1991 Medicare Advisory relating to administration
kits.

35.       Thereafter, on monthly HCFA 1500 claim forms for IDPN patients, for
dates of service between March 1, 1991 and April 30, 1992, NMC Homecare falsely
and fraudulently listed on the claim form either that it had supplied a one
month administration kit or that it had provided 30 or 31 administration kits.
In the case of patients who received IDPN for only part of the month, NMC
Homecare falsely and fraudulently listed the number of days between the
patient's first and last IDPN treatment during the month. These false and
fraudulent claims were paid by BC/BS of SC.

                                      18
<PAGE>

35.       In or about May 1992 BC/BS of SC issued a second Medicare Advisory to
NMC Homecare and other IDPN suppliers regarding procedure code B 4224,
administration kits. This Advisory expressly stated that IDPN suppliers should
not bill for 31 administration kits, if the patient only received IDPN 12-13
times per month. Upon receipt of this Advisory NMC Homecare's billing center
personnel again initiated steps to comply with this Advisory.

35.       NMC Homecare's senior officers at Waltham, MA realized that
implementing this Advisory would reduce NMC Homecare's IDPN revenues and profits
by nine (9) percent, or approximately $400,000 per month. NMC Homecare's senior
officers instructed the billing center personnel not to implement the May 1992
Medicare Advisory relating to IDPN administration kits and to continue billing
as they had been doing.

35.      Thereafter, on monthly HCFA 1500 claim forms for IDPN patients, for
dates of service between May 1, 1992 and June 30, 1992, NMC Homecare falsely and
fraudulently listed on the claim forms that it had provided 30 or 31
administration kits, when, in fact, it had only provided 12 or 13 administration
kits. In the case of patients who received IDPN for only part of the month, NMC
Homecare falsely and fraudulently listed the number of days between the
patient's first and last IDPN treatment during the month. These false and
fraudulent claims were paid by BC/BS of SC.

                                      19
<PAGE>

               Hang Fees, Education Grants and Other Inducements
               -------------------------------------------------

35.       It was the policy and practice of NMC Homecare to offer and pay hang
fees in excess of $30 per bag, educational grants, and other remuneration to
non-BMAs in order to induce IDPN referrals and to maintain existing IDPN
customers. Such inducements were provided to non-BMAs when NMC Homecare was
faced with competing IDPN suppliers and NMC Homecare believed that higher hang
fees and other inducements were necessary to obtain or maintain the non-BMA's
IDPN business.

35.       IDPN Coordinators, General Manager, Regional Directors and other NMC
Homecare staff were instructed to consider the IDPN referral potential of the
non-BMA and the degree of competition from other IDPN providers, in deciding how
high the hang fees and other inducements should be. In competitive situations,
NMC Homecare regularly determined what it was willing to offer and pay a non-BMA
for its IDPN business without regard to what the non-BMA's actual cost was in
administering IDPN.

35.       In or about February 1992 NMC Homecare introduced the calculation tool
as a marketing device designed to respond to competitors who were offering
inflated hang fees. Although the written policy of NMC Homecare, beginning in
February 1992, was to require a calculation tool from a non-BMA before NMC
Homecare would pay a hang fee in excess of $30 per bag, that policy was often
ignored and the practice of NMC Homecare was to pay hang

                                      20
<PAGE>

fees in excess of $30 per bag, without obtaining a calculation tool, when such
payments were needed to obtain or maintain IDPN business.

35.       In or about the summer of 1993 NMC Homecare became aware that the
Inspector General of the U.S. Department of Health and Human Services had issued
a report stating that hang fees in the $25 to $60 per bag range were legally
questionable and apparent violations of the Medicare Anti-kickback Act. NMC
Homecare's senior management directed that a sample calculation tool be prepared
which purported to justify NMC Homecare's standard $30 hang fee. NMC Homecare
knew that the true incremental cost to a dialysis facility of administering IDPN
was less than $30 a bag and that it was illegal to pay a non-BMA more than its
actual cost of administering IDPN.

35.       In or about October 1993 NMC Homecare directed its IDPN Coordinators
to take its new sample calculation tool to their existing customers who were
receiving hang fees of $40 or more, but for whom NMC Homecare did not have a
calculation tool. IDPN Coordinators were instructed to complete the tool with
the facility to ensure that the cost reported on the calculation tool matched or
was close to the hang fee amount NMC Homecare was already paying that non-BMA.

35.       NMC Homecare regularly "backed into" the numbers on calculation tools.
It was the practice of NMC Homecare personnel to complete the tool by starting
with the final number desired,

                                      21
<PAGE>

and fill in the time estimates needed to reach that final number. 61. NMC
Homecare's IDPN Coordinators prepared sample calculation tools at specified
levels, such as $40, $45 and $50 per bag, exchanged these calculation tools
among themselves, provided these sample calculation tools to customers so they
could fill out their own tool and sometimes submitted calculation tools to NMC
Homecare headquarters without any input from the customer.

62.       It was the policy and practice of NMC Homecare that no efforts were
made to ensure that the costs reported on calculation tools were the true,
actual costs of the non-BMAs in administering IDPN. Non-BMAs were not required
to submit back-up documentation to substantiate purported costs greatly in
excess of NMC Homecare's standard $30 hang fee, most calculation tools were not
signed by the non-BMA, and most calculation tools received no review for
accuracy or reasonableness.

62.       It was the policy and practice of NMC Homecare to provide purported
educational grants to non-BMAs as inducements to obtain IDPN referrals.
Following the HHS Inspector General's 1993 report on hang fees, some non-BMAs
preferred education grants, rather than higher hang fees, in return for their
IDPN business. In awarding educational grants to non-BMAs, NMC Homecare
instructed its General Managers to weigh the anticipated benefit of the grant
(i.e. IDPN referrals) against its cost in deciding whether to pay an educational
grant.

                                  OVERT ACTS
                                  ----------

                                      22
<PAGE>

     In furtherance of the conspiracy, and to effect the objects thereof, NMC
Homecare and the co-conspirators, performed the following overt acts, among
others, in the District of Massachusetts and elsewhere:

64.       In or about November 1988, NMC Homecare began using the IIS form in
connection with the preparation of IDPN claims to Medicare. This form allowed
NMC Homecare to pick and choose the information it would present to Medicare in
support its IDPN claims. 65. On or about December 1, 1988, NMC Homecare issued
check No. 113 in the amount of ten thousand dollars ($10,000) payable to Florida
Kidney Center for a purported education grant.

65.       In or about March 1989, NMC Homecare's Clinical Reimbursement
Department submitted 102 claims to Medicare for IDPN for dates of service in the
period 10/1/87 to 4/30/88, in which it purposely deleted medical documentation
which would tend to show the patient did not meet Medicare's coverage criteria.

65.       In or about August 1989, NMC Homecare created an IDPN Task Force to
clean-up previously unbilled IDPN claims from 1987 and 1988. These claims were
unbilled because there was insufficient documentation that the patient met
Medicare's coverage criteria for IDPN.

65.       In or about November 1989, members of the IDPN Task Force visited
dialysis units in Mississippi, Florida, Maryland,

                                      23
<PAGE>

Puerto Rico and Massachusetts to prepare IIS forms relating to the IDPN clean-up
project.

65.       In or about November 1989, NMC Homecare's Cincinnati/Columbus, Ohio
branch wrote 14 IIS forms in one day, as part of the IDPN clean-up project, with
assistance from an IDPN Coordinator assigned to the IDPN Task Force.

65.       On or about November 30, 1989, NMC Homecare's Midwest Regional
Director notified the President of NMC Homecare that a non-BMA in his territory
had been approached by a competitor who offered a $50 hang fee and NMC Homecare
decided that it would match that fee in order to be certain it would keep the
account.

65.       On or about March 2, 1990, the President of NMC Homecare signed a
purported Research Agreement between NMC Homecare and Florida Kidney Center
which required NMC Homecare to pay Florida Kidney Center one hundred thousand
($100,000) dollars.

65.       On or about April 2, 1990, NMC Homecare signed an IDPN contract with
Florida Kidney Center which provided that NMC Homecare would pay Florida Kidney
Center a $35 per bag hang fee, a $35 per month per patient nutritional
assessment fee, and provide Florida Kidney Center with five (5) cases of enteral
supplements, per month.

65.       In or about June 1990, NMC Homecare agreed to increase the hang fee
paid to Houston Kidney Center from $30 to $50 per

                                      24
<PAGE>

bag, in response to competitive pressures from another IDPN supplier.

65.       In or about November 1990, NMC Homecare executives met in Ontario,
California to discuss IDPN scale-up efforts in the Pacific Region.

65.       In or about December 1990, the Manager of the Clinical Reimbursement
Department traveled to Waltham, Massachusetts to meet with various NMC Homecare
executives in preparation for the first meeting of the IDPN Special Interest
Group.

65.       On or about December 18, 1990, NMC Homecare increased its hang fee
payments to L.E. Cox Medical Center in Springfield, Missouri in response to
competition from another IDPN provider.

65.       On or about January 10, 1991, the IDPN Special Interest Group met in
Waltham, Massachusetts to discuss expanding NMC Homecare's IDPN business.

65.       In or about February 1991, NMC Homecare's V.P. of Finance caused a
copy of the Medicare Advisory relating to billing for IDPN administration kits
to be faxed to NMC Homecare's headquarters in Waltham, Massachusetts.

65.       In or about February and March 1991, senior executives at NMC
Homecare's headquarters held a series of meetings relating to billing Medicare
of IDPN administration kits and decided not

                                      25
<PAGE>

to bill for the number of kits actually used, in direct contravention of
Medicare's requirements.

65.       In or about early March 1991, at the request of the V.P. of
Operations, the Clinical Reimbursement Department analyzed the Medicare payment
history on patients from Florida Kidney Centers, in preparation for a hang fee
offer NMC Homecare was contemplating in response to competitive pressures.

65.       On or about March 15, 1991, NMC Homecare's V.P. of Operations made a
financial offer to Florida Kidney Centers for the purpose of securing its IDPN
business. The offer included the following incentives: (1) a $65 hang fee; (2) a
weekly $50 payment per patient for dietary consultations; (3) a $30,000 annual
educational grant; (4) a $20,000 annual indigent patient drug fund; and (5)
$15,000 worth of computer equipment.

65.       On or about June 14, 1991, NMC Homecare issued an IDPN Clinical Manual
which authorized IDPN Coordinators to infer the existence of certain GI
diagnoses in potential IDPN patients, when no other GI diagnosis was available.

65.       In or about September 1991, NMC Homecare agreed with Houston Kidney
Center to increase its hang fee from $50 to $60 per bag, in response to
competitive pressure.

65.       In or about October 1991, the Clinical Reimbursement Department
reported to NMC Homecare headquarters that the quality

                                      26
<PAGE>

of clinical documentation supporting IDPN claims had decreased as the volume of
IDPN patients had increased.

65.       In or about February 1992, NMC Homecare held a national sales meeting
in Phoenix, Arizona in which the Clinical Reimbursement Department made a
presentation to the IDPN Coordinators regarding the preparation of IIS forms.

65.       On or about February 10, 1992, NMC Homecare provided its sales staff
with a sample calculation tool to use when negotiating IDPN contracts.

65.       On or about February 28, 1992, NMC Homecare issued a policy memorandum
to the field authorizing General Managers to award a non-BMA an education grant
of up to $4,000 per year.

65.       In or about May 1992, NMC Homecare's Lenexa, Kansas billing center
notified NMC Homecare headquarters staff that a Medicare Advisory had been
received stating that an IDPN provider could not bill for 31 administration kits
if the patient received IDPN only 12-13 times in that month.

65.       In or about June 1992, a series of meetings were held among NMC
Homecare senior executives to discuss billing for IDPN administrative kits.

65.       On or about July 4, 1992, the President of NMC directed

                                      27
<PAGE>

the V.P. of Finance of NMC Homecare not to make any change in how NMC Homecare
billed IDPN administration kits without talking with him.

65.       On or about July 27, 1992, NMC Homecare entered into an IDPN contract
with Lourdes Hospital in Paducah, Kentucky in which NMC Homecare agreed to pay a
$50 hang fee.

65.       On or about August 11 to 14, 1992, a group of NMC Homecare executives
met in Lenexa, Kansas with the recently resigned head of the BC/BS of SC PEN
unit to discuss processing of IDPN claims.

65.       On or about September 11, 1992, NMC Homecare entered into an IDPN
contract with Clark County Dialysis in Cincinnati, Ohio in which NMC Homecare
agreed to pay a hang fee of $50.

65.       On or about December 5, 1992, in response to competition from another
IDPN provider, NMC Homecare entered into an IDPN contract with Bon Secours
Dialysis Center in Baltimore, Maryland to pay a $40 hang fee for each bag of
IDPN administered.

95.       On or about December 23, 1992, NMC Homecare delivered two checks
totaling $37,040 to Woodland Dialysis for hang fee payments covering IDPN
therapies provided during the final eight months of 1992.

96.       On or about January 26, 1993, NMC Homecare initiated IDPN therapy for
Patient No. 1, a patient at BMA El Paso-West. The IIS form for this patient
contains numerous false statements

                                      28
<PAGE>

and material omissions, including GI symptoms the patient did not have,
medications she was not taking, and false assertions she had been hospitalized
for diabetic gastroparesis.

96.       In or about February 1993, the Clinical Reimbursement Department made
a presentation at NMC Homecare's National Managers Meeting. The presentation
included a slide marked "Not to be used as a handout," in which it listed
certain preferred medications to list on IIS forms, suggested that IIS forms not
show alternating symptoms of diarrhea and constipation, and that they not show
anorexia, alcohol induced or psychological conditions, senility and phrases such
as "avoids eating" or any indication that the patient did not eat.

96.       On or about June 18, 1993, NMC Homecare entered into an IDPN contract
with Woodland Dialysis in which NMC Homecare agreed to a hang fee of $52 per bag
and to provide $17,000 in educational grants.

96.       In or about August 1993, NMC Homecare's IDPN Product Manager delivered
a memorandum to the V.P. of Marketing, stating that the calculation tool was
"developed as a marketing tool" to overcome "competitors offering inflated hang
fees . . . when a non-BMA completes the calculation tool, they will be lucky to
get $20.00. That was the point . . . sometimes the reps are confused and think
they can't pay a certain amount unless the facility can justify it using the
hang fee tool, that was not the intent."

                                      29
<PAGE>

96.       On or about August 30, 1993, NMC Homecare executed an IDPN contract
with the Hortense & Louis Rubin Dialysis Center in Albany, New York in which NMC
Homecare agreed to pay a hang fee of $45 per bag.

96.       On or about September 1, 1993, NMC Homecare senior executives held the
first of a series of meetings at corporate headquarters in Waltham,
Massachusetts to discuss IDPN hang fees, among other things.

96.       On or about September 20, 1993, NMC Homecare entered into an IDPN
contract with Good Samaritan Hospital in Portland, Oregon in which NMC Homecare
agreed to pay a hang fee of $41 per bag.

96.       On or about September 22, 1993, NMC Homecare entered into an IDPN
contract with Lexington Clinic Kidney Center in Lexington, Kentucky in which it
agreed to pay a hang fee of $45.

96.       On or about October 13, 1993, the IDPN Product Manager sent a memo to
the President of NMC Homecare in which she stated that only 80% of NMC
Homecare's IDPN patients have "real" justified GI dysfunction.

96.       On or about October 15, 1993, NMC Homecare issued a memorandum to its
sales staff requiring that calculation tools be submitted within 30 days for all
non-BMAs receiving hang fee

                                      30
<PAGE>

payments of $40 or more for which no calculation tool was on file. In this
memorandum, NMC Homecare instructed its employees to work with the non-BMAs to
ensure that the cost reported on the calculation tool is consistent with (or
close to) the hang fee currently being paid to that facility.

96.       On or about October 18, 1993, NMC Homecare executed an IDPN contract
with Dialysis Center of Middle Georgia in Macon, Georgia in which it agreed to
pay a $40 hang fee.

96.       On or about October 28 and 29, 1993, NMC Homecare held a national
meeting of IDPN Coordinators in Waltham, Massachusetts, to discuss its hang fee
policies, among other things.

96.       On or about November 8, 1993, NMC Homecare's San Diego branch General
Manager approved the payment of a $1,560 invoice submitted by San Diego Dialysis
Services for IDPN treatments provided in October 1993 at the rate of $60 per
bag.

96.       On or about November 13, 1993, NMC Homecare signed an IDPN contract
with Houston Kidney Center-Southeast in which NMC Homecare agreed to pay a hang
fee of $50 per bag.

96.       On or about January 4, 1994, NMC Homecare executed an addendum to its
IDPN contract with Ozarks Dialysis Services in Springfield, Missouri in which
NMC Homecare agreed to pay a hang

                                      31
<PAGE>

fee of $50 per bag.

96.       On or about January 26, 1994, NMC Homecare sent a memo to its field
staff authorizing General Manager to give annual educational grants to non-BMAs
of up to $4,000.

96.       On or about February 7, 1994, NMC Homecare participated in a telephone
Fair Hearing relating to the appeal of denied IDPN claims relating to Patient
No. 2, a patient at BMA Chicopee. NMC Homecare failed to advise the FH officer
that there were numerous false statements and material omissions on the IIS form
it submitted in support of this hearing, including false statements relating to
symptoms, medications, lab values and enteral supplements.

96.       On or about February 9, 1994, NMC Homecare initiated IDPN therapy for
Patient No. 3, a patient at the BMA of McAllen, Texas. The IIS form relating to
this patient contained numerous false statements and material omissions,
including false diagnosis, symptoms, medications, weight loss and enteral
supplements, and failure to disclose the patient had been started on IDPN
because of two hospitalizations.

96.       On or about February 17, 1994, the President of NMC Homecare wrote to
the President of NMC, stating that NMC Homecare's IDPN patient census had fallen
dramatically in the last several months because in the past NMC Homecare had
been

                                      32
<PAGE>

able to put patients on IDPN "w/o GI disorder/malabsorption," but the new DMERCs
were applying the coverage criteria more strictly.

96.       On or about April 22, 1994, NMC Homecare initiated IDPN therapy for
Patient No. 4, a patient in the Cincinnati, Ohio area. The IIS form for this
patient contains false information and material omissions, including using an
albumin lab value of 2.8 to justify IDPN, when a repeat test, one week later,
before IDPN therapy started, had a value of 4.2.

96.       On or about May 26, 1994, NMC Homecare participated in a telephone
Fair Hearing on denied IDPN claims relating to Patient No. 2. It continued to
rely on an IIS form containing numerous false statements and material omissions,
and also falsely reported to the FH officer that the patient had lost 30 pounds
in four months prior to the start of IDPN.

96.       Beginning on or about October 10, 1994, and continuing through on or
about October 6, 1995, as detailed below, for the patient indicated, NMC
Homecare submitted a claim to Medicare for reimbursement for IDPN, which was
paid, which was a false claim, because it was based on an IIS form which
contained false statements and material omissions:

       Patient No. 1    Patient No. 3  Patient No. 4
       -------------    -------------  -------------

       10/10/94         10/11/94       01/04/95
       11/11/94         11/17/94       01/10/95
       12/08/94         12/12/94       02/21/95
       01/09/95                        03/07/95
       02/08/95                        04/07/95

                                      33
<PAGE>

          03/09/95                        05/08/95
          03/17/95                        06/13/95
          04/11/95                        07/07/95
          05/11/95                        09/07/95
          06/09/95                        09/12/95
          07/12/95                        10/06/95
          08/11/95
          09/08/95

96.       In or about November 1994, NMC Homecare paid $1,300 to Bethany
Dialysis in Bethany, Oklahoma, representing hang fee payments at $50 per bag for
IDPN treatments administered during the month of October 1994.

96.       In or about November 1994, NMC Homecare paid $1,600 to Lourdes
Dialysis in Paducah, Kentucky, representing hang fee payments at $40 per bag for
IDPN treatments administered during the month of October 1994.

96.       On or about December 1, 1994, NMC Homecare issued check number 19157
in the amount of $2,385 to Hortense & Louis Rubin Dialysis Center representing
hang fee payments at $45 per bag for IDPN treatments administered during the
month of September 1994.

96.       In or about January 1995, NMC Homecare paid $946 to Angelina Dialysis
in Houston, Texas, representing hang fee payments at $43 per bag for IDPN
treatments administered during the month of December 1994.

96.       On or about January 19, 1995, NMC Homecare issued check

                                      34
<PAGE>

number 025273 in the amount of $6,360 to Houston Kidney Center representing hang
fee payments at $60 per bag for IDPN treatments administered during the month of
December 1994.

96.       On or about January 28, 1995, NMC Homecare issued check number 035821
in the amount of $5,160 and check number 035820 in the amount of $1,548 to
Woodland Dialysis representing hang fee payments at $52 per bag for IDPN
treatments at Woodland during the month of December 1994.

96.       On or about March 14, 1995, NMC Homecare executed an amendment to an
IDPN contract with AKC Broward, in Pompano Beach, Florida, in which NMC Homecare
agreed to pay a hang fee of $40 per bag.

96.       On or about June 9, 1995, NMC Homecare decided to withdraw IDPN claims
relating to Patient No. 2 from an ALJ Hearing scheduled for June 27, 1995. NMC
Homecare knew there was no GI diagnosis. NMC Homecare failed to disclose to the
ALJ, however, the numerous false statements and material omissions it had used
to get prior claims paid relating to this patient and failed to refund the money
to Medicare it had received on those claims.

96.       In or about July 1995, NMC Homecare paid $2,650 to Midway Dialysis
Center, representing hang fee payments at $50 per bag for IDPN treatments
administered during the month of June 1995.

96.       On or about July 5, 1995, NMC Homecare executed an

                                      35
<PAGE>

IDPN contract with Beverly Hospital in Beverly, Massachusetts in which NMC
Homecare agreed to pay a hang fee of $40 per bag.

96.       On or about August 28, 1995, NMC Homecare executed an IDPN contract
with Jewish Hospital Dialysis Unit in St. Louis, Missouri in which NMC Homecare
agreed to pay a hang fee of $40 per bag.

96.       In or about September 1995, NMC Homecare paid $5,880 to Charlotte
Hungerford Hospital in Torrington, Connecticut, representing hang fee payments
at $40 per bag for IDPN treatments administered during the month of August 1995.

96.       In or about October 1995, NMC Homecare paid $1,560 to Missouri Delta
Community Hospital in Sikeston, Missouri, representing hang fee payments at $40
per bag for IDPN treatments administered during the month of September 1995.

96.       In or about November 1995, NMC Homecare paid $1,800 to Nephroplex
Service Center in Mount Vernon, Illinois, representing hang fee payments at $40
per bag for IDPN treatments administered during the month of October 1995.

96.       In or about November 1995, NMC Homecare paid $2,720 to Quachita
Regional Dialysis Center in Kansas, representing hang fee payments at $40 per
bag for IDPN treatments administered

                                      36
<PAGE>

during the month of October 1995. (All in violation of Title 18, United States
Code, Section 371.)

                                      37
<PAGE>

COUNT TWO           (18 U.S.C. (S) 286  -- Conspiracy to Defraud the
- ---------
                    United States by Obtaining Payment of False or Fraudulent
                    Claims) 133. The allegations set forth in paragraphs 1-3 and
                    5-16 are incorporated herein and realleged as if fully set
                    forth herein.

134.      LIFECHEM was a clinical blood testing laboratory which specialized in
performing blood tests for ESRD patients. LIFECHEM operated two clinical
laboratories, one located in Northvale, New Jersey, and the other in Woodland
Hills, California. BMAs were generally required to use LIFECHEM for laboratory
blood tests. LIFECHEM had to compete with other blood testing laboratories for
the business of non-BMAs.

135.      LIFECHEM was an approved supplier of Medicare services under Title
XVIII of the Social Security Act of 1965. As an approved supplier, LIFECHEM was
authorized to submit directly to the carriers under contract with HCFA lawful
claims for reimbursement for clinical laboratory blood tests. At all pertinent
times, LIFECHEM submitted its claims for Medicare reimbursement to Pennsylvania
Blue Shield of Camp Hill, Pennsylvania, later known as Xact Medicare Services, a
carrier under contract with HCFA. LIFECHEM was also authorized to submit
directly to CHAMPUS claims for laboratory services provided to individuals
covered by CHAMPUS.

136.      MPD employed a sales force of Dialysis Services Specialists, who were
assigned a designated geographic territory and sold both the dialysis products
of MPD and the blood testing services of LIFECHEM. These salespersons called on
both BMAs and

                                      38
<PAGE>

non-BMAs within their territory and their compensation included salary and
commissions.

137.      For ESRD patients who received dialysis treatments at a Medicare
approved dialysis facility, Medicare established a composite rate payment that
was paid directly to the dialysis facility and included payment for certain
laboratory blood tests at designated frequencies that were needed in the care
and treatment of ESRD patients. These laboratory blood tests covered by the
composite rate were known as "Routine Tests," and were not separately billable
by LIFECHEM to Medicare. Medicare paid the dialysis facility for the Routine
Tests, and it was the responsibility of the dialysis facility to pay the blood
testing laboratory, such as LIFECHEM, for its provision of Routine Tests.

138.      Frequently ESRD patients suffered from additional medical problems and
complications which required medical treatment beyond the process of dialysis.
For such persons, additional monitoring of the blood was sometimes medically
necessary, and these additional laboratory blood tests were referred to as
"Non-Routine Tests."

139.      The Medicare Program separately paid for Non-Routine Tests by directly
reimbursing the clinical laboratory, such as LIFECHEM, on a fee-for-service
basis. The Non-Routine Tests were lawfully reimbursable by the Medicare Program
only if they were reasonable and medically necessary for the diagnosis or
treatment of signs or symptoms of illness or injury in ESRD patients other than
ESRD, except for certain Non-Routine Tests enumerated by HCFA that were allowed
at specified frequencies for ESRD patients

                                      39
<PAGE>

 ("Medicare Allowable Tests"). To obtain reimbursement for Non-Routine Tests
provided to ESRD patients, LIFECHEM was required to certify to HCFA, through its
Medicare carrier, that the tests were medically necessary.

140.      An automated laboratory machine, sometimes known as a sequential
multiple analysis computer, was capable of performing a "panel" or "battery" of
more than 20 chemistry tests on a single specimen of blood. At LIFECHEM, at all
pertinent times, this automated battery of chemistry tests was known as a "Chem
20." For most ESRD patients, once a month, Medicare paid for LIFECHEM's Chem 20
as part of the Composite Rate Payment made directly to the dialysis facilities.
The defendant LIFECHEM knew that individual chemistry tests, performed as part
of LIFECHEM's monthly Chem 20, were not lawfully separately billable to Medicare
on a fee-for-service basis, and that to submit separate bills for such services
constituted duplicate bills for services for which Medicare had already paid.

141.      From in or about the mid-1980's, LIFECHEM offered for sale to dialysis
physicians, and received reimbursement from Medicare and from CHAMPUS for, a
group of tests that LIFECHEM called a Hepatitis panel. The Hepatitis panel
consisted of, among other tests, a Hepatitis B surface antigen test ("antigen"),
a Hepatitis B surface antibody test ("antibody"), and a Hepatitis B IgM Core
test ("IgM Core")(collectively, the "Hepatitis B related tests"). At relevant
times, the Hepatitis B related tests were also offered individually.

142.      For all ESRD patients, Medicare and CHAMPUS paid for

                                      40
<PAGE>

one annual antibody test or one annual IgM Core test, but not both, as a
Medicare Allowable Test. Medicare and CHAMPUS paid for additional antibody and
IgM Core tests so long as the tests were medically necessary for the treatment
or diagnosis of the patient's medical condition other than ESRD.

143.      Prior to August, 1991, LIFECHEM knew that IgM Core tests were not
routinely medically necessary for any ESRD patient, but were only necessary for
ESRD patients in certain limited circumstances such as upon admission or
readmission to a dialysis facility or for the rare patient who had active
Hepatitis B disease. LIFECHEM further knew, prior to August, 1991, that while
the IgM Core test was separately available to physicians, physicians rarely, if
ever, individually ordered the IgM Core test for their ESRD patients.

144.      Medicare also paid for a clinical laboratory test for the Hepatitis C
antibody ("Hepatitis C") so long as the test was ordered by a physician who
considered the test to be medically necessary for the treatment or diagnosis of
the patient's medical condition other than ESRD.

145.      As of August, 1991, LIFECHEM knew that repeat Hepatitis C testing on
ESRD patients who were confirmed positive for the Hepatitis C antibody was not
medically necessary. LIFECHEM further knew, as of August, 1991, that while
LIFECHEM made the Hepatitis C test available to physicians, physicians
infrequently ordered the Hepatitis C test for their ESRD patients.

                                 The Conspiracy
                                 --------------

                                      41
<PAGE>

146.      From in or about January, 1991 through in or about June, 1997, the
exact dates being unknown to the United States Attorney, in Waltham and
elsewhere in the District of Massachusetts, in Northvale and Rockleigh, New
Jersey, and elsewhere in the United States, the defendant

     LIFECHEM, INC., together with others known and unknown to the United States
Attorney, did knowingly, intentionally and willfully agree, combine, and
conspire to defraud the United States, and its agency the Health Care Financing
Administration, in its administration of the Medicare Program, by obtaining and
aiding to obtain the payment and allowance of hundreds of thousands of false,
fictitious and fraudulent claims for: (1) Hepatitis B IgM Core tests included as
part of a Hepatitis panel that LIFECHEM knew were not medically necessary for
the diagnosis or treatment of Medicare beneficiaries because the tests were
performed on patients who were existing patients in a dialysis facility and who
did not suffer from active Hepatitis B disease; (2) Hepatitis C Antibody tests
included as part of a Hepatitis panel that LIFECHEM knew were not medically
necessary for the diagnosis or treatment of Medicare beneficiaries because they
were performed on ESRD patients who had already been confirmed positive for the
Hepatitis C antibody; (3) chemistry tests performed by the laboratory as part of
LIFECHEM's automated Chem 20 for which Medicare had already paid through the
Composite Rate Payment, and which LIFECHEM knew were not lawfully billable a
second time to

                                      42
<PAGE>

Medicare; and (4) additional medically unnecessary blood laboratory tests
generated by LIFECHEM's paneling and marketing activities designed to manipulate
physician ordering practices for blood laboratory tests on their ESRD patients,
all for the purpose of obtaining a substantial increase in orders for particular
laboratory tests that were highly profitable for LIFECHEM, without regard to
whether the increased testing was medically necessary for the diagnosis or
treatment of Medicare beneficiaries; so that LIFECHEM could unlawfully obtain at
least $22,900,000 in reimbursement from the Medicare Program to which it was not
entitled.

                          OBJECTIVE OF THE CONSPIRACY
                          ---------------------------

147.   LIFECHEM had, as the objective of this conspiracy, increasing the
laboratory blood testing conducted on thousands of ESRD patients, without regard
to the medical necessity for such blood testing in the diagnosis or treatment of
those Medicare beneficiaries, all to obtain unlawful reimbursement from the
Medicare program for that additional medically unnecessary testing. LIFECHEM
obtained this additional reimbursement by submitting false, fictitious and
fraudulent claims for payment to the Medicare Program for these blood tests,
which claims falsely certified to Medicare that the laboratory blood tests were
medically necessary when LIFECHEM knew that they were not. A further objective
of the conspiracy was to submit false, fictitious and fraudulent claims for
payment for individual chemistry tests that were being performed in the
laboratory on a sequential multi-channel analyzer as part of LIFECHEM's
automated

                                      43
<PAGE>

Chem 20, for which Medicare had already paid, all to enable LIFECHEM to obtain
further unlawful reimbursement from the Medicare program to which LIFECHEM was
not entitled. As a consequence of these unlawful objectives, LIFECHEM also
submitted claims for medically unnecessary blood testing to other federal health
care insurance programs, including CHAMPUS, that sought payment for the
performance of medically unnecessary laboratory tests on dialysis patients
insured by those programs.

148.      As a result of this conspiracy, the defendant LIFECHEM, together with
others known and unknown to the United States Attorney, in fact defrauded the
United States and the Medicare Program through the submission of false,
fictitious and fraudulent claims in an amount of $22,900,000 dollars.

                       MANNER AND MEANS OF THE CONSPIRACY
                       ----------------------------------
149.      It was a part of the manner and means of the conspiracy that the
defendant LIFECHEM, together with others known and unknown to the United States
Attorney:

     a.   bundled a Hepatitis C antibody test with LIFECHEM's Hepatitis panel,
so that each time a doctor ordered a Hepatitis panel, a Hepatitis C antibody
test was performed for the same patient, without regard to whether the test was
medically necessary in the treatment and diagnosis of the patient's medical
condition;

     b.   marketed and promoted the frequent ordering of LIFECHEM's Hepatitis
panel for all ESRD patients, so that each time a doctor ordered a Hepatitis
panel, the IgM Core test was automatically performed for the same patient
without regard to

                                      44
<PAGE>

whether the test was medically necessary in the treatment and diagnosis of the
patient's medical condition;

     c.   supplied to physicians LIFECHEM's paper requisition or laboratory test
order forms which made it difficult for physicians to (1) order LIFECHEM's
Hepatitis panel without the bundled Hepatitis C test and IgM Core test; and (2)
understand what Hepatitis tests were included on LIFECHEM's Hepatitis panel; and
which discouraged physicians from ordering LIFECHEM's Hepatitis panel without
the bundled tests;

     d.   misled physicians by falsely suggesting to them that ordering
LIFECHEM's laboratory blood tests in a panel or profile such as the Hepatitis
panel was cheaper or more economical than selectively ordering individual blood
tests, and by failing to disclose to physicians the fact that LIFECHEM was
charging the Medicare Program separately for each of the bundled tests at the
Medicare fee schedule;

     e.   provided incentives in the form of commissions to MPD's sales force to
encourage and promote the sale to the BMAs of LIFECHEM's Hepatitis panels
without regard to whether the additional Hepatitis C and IgM Core tests within
the Hepatitis panel were medically necessary in the diagnosis and treatment of
the patients' conditions other than ESRD;

     f.   supplied to dialysis facilities a computer and computerized test
ordering software which encouraged physicians to order LIFECHEM's Hepatitis
panels rather than individual tests; which made it difficult to order LIFECHEM's
Hepatitis panel without the bundled Hepatitis C test or IgM Core test; and

                                      45
<PAGE>

which made it difficult for physicians to understand what tests were included on
LIFECHEM's Hepatitis panel;

     g.   utilized certain MPD sales personnel to install a computerized
ordering system in the BMAs, and submitted or caused to be submitted claims for
payment to Medicare for a sudden increase in orders from the BMAs of LIFECHEM's
Hepatitis panels in one sales region, without regard to whether the additional
tests were medically necessary in the diagnosis or treatment of the ESRD
patients' medical conditions other than ESRD;

     h.   misled physicians in some instances by incorrectly suggesting to them
that BMA medical policy required or encouraged the routine ordering of
LIFECHEM's Hepatitis panels;

     i.   obtained diagnosis codes, known as ICD-9 codes, for Hepatitis panels
from dialysis clinics to enable LIFECHEM to provide medical justification to the
Medicare carrier for the Non-Routine Tests, without disclosing to the Medicare
carrier that not every test on the Hepatitis panel had been ordered separately
by the physician as being medically necessary;

     j.   billed the Medicare Program for these bundled Hepatitis C and IgM Core
tests, all the while knowing that the tests had not been ordered knowingly by
doctors as medically necessary tests for their patients, and further falsely
certified to the Medicare Program and to CHAMPUS that the tests were medically
necessary when LIFECHEM knew that many of them were not medically necessary;

     k.   collected from the Medicare Program about $16.00, more or less, for
each Hepatitis B IgM Core test; $19.00, more or

                                      46


<PAGE>

less, for each Hepatitis C antibody test; and collected from CHAMPUS about
$34.00, more or less, for each Hepatitis B IgM Core test; and

          l.  billed the Medicare Program for the same test twice by billing
once to the dialysis facility for the entire panel which was reimbursed by
Medicare through the composite rate, and again directly to the Medicare Program
for certain individual tests included within the panel, knowing that the bills
were duplicate bills and were not lawfully reimbursable.

                                  OVERT ACTS
                                  ----------

     150. In furtherance of the conspiracy, the defendant LIFECHEM, together
with others known and unknown to the United States Attorney, committed, among
other acts, the following overt acts in the District of Massachusetts and
elsewhere:

          a.   In or about May, 1991, the defendant LIFECHEM and others
initiated a Profit Recovery Program to offset revenue losses from government
regulatory actions in connection with the manufacturing of certain MPD dialysis
products by adding the Hepatitis C test to LIFECHEM's Hepatitis panel, and by
marketing and causing the substitution of the Hepatitis panel for the individual
Hepatitis test ordering practices then in place at the BMAs (the "Hepatitis
plan").

          b.   In or about June 1991,  the General Manager of LIFECHEM obtained
approval from the President of NMC, and the President and the Vice President of
Finance of MPD, among others, to purchase equipment to enable LIFECHEM to
perform additional Hepatitis testing that was expected to result from the
Hepatitis

                                      47
<PAGE>

plan, which, the General Manager informed her superiors, included an estimated
additional 55,000 Hepatitis C tests and an additional 94,117 IgM Core tests that
she expected would result from the implementation of the Hepatitis plan in the
first year alone.

          c.   In or about June, 1991, to justify approval to purchase the
laboratory equipment that defendant LIFECHEM needed to perform the additional
Hepatitis tests, the General Manager of LIFECHEM informed the President of NMC,
and the President and Vice President of Finance of MPD, among others, that
LIFECHEM projected an increase in 1991 revenue by $524,000 and profit from
operations ("PFO") by $308,000 if the Hepatitis C test could be added to the
Hepatitis panel by July 1, 1991, with a five year projected revenue stream of
over $6,000,000 and PFO of over $3,300,000; and that LIFECHEM projected an
increase in 1991 revenue by $2,083,000 with a PFO of $1,330,000 if Hepatitis
panels were substituted for individual Hepatitis test ordering in the BMAs, with
a five year projected revenue stream of $27,453,952 with a PFO of $18,989,618.

          d.   In or about June 1991, the LIFECHEM Product Manager notified the
MPD sales force about the new plan to market LIFECHEM's Hepatitis panels and
explained that the goal was to cause BMA physicians to order the entire
Hepatitis panel rather than the separate Hepatitis B antigen and/or antibody
tests then being ordered by those physicians.

          e.  On or about July 31, 1991, the LIFECHEM Product Manager announced
the addition of the Hepatitis C test to the

                                      48
<PAGE>

LIFECHEM Hepatitis panel, without providing customers an option on the pre-
printed requisition forms to obtain the LIFECHEM Hepatitis panel without the
added Hepatitis C test.

          f.  In or about August 1991, the LIFECHEM General Manager and Product
Manager, and the MPD Vice-President of Marketing, rejected a plan to prevent
repeated medically unnecessary testing for Hepatitis C on ESRD patients who were
previously confirmed positive for the antibody.

          g.  In or about September, 1991, the LIFECHEM General Manager directed
that no separate panel would be included on the LIFECHEM pre-printed requisition
form to provide doctors the choice of ordering LIFECHEM's Hepatitis panel
without the added Hepatitis C blood test, despite complaints about the lack of
choice from both physicians and the MPD sales force, and despite requests
certain from physicians to delete the Hepatitis C test from the Hepatitis panel.

          h.  In or about January 1992, after an important customer of LIFECHEM
threatened to withdraw its entire laboratory business if the Hepatitis C test
was not deleted from LIFECHEM's Hepatitis panel, LIFECHEM created a special
panel without the Hepatitis C test for that particular customer only, and did
not offer that choice to any other LIFECHEM customer.

          i.  LIFECHEM supplied to dialysis clinics preprinted paper LIFECHEM
requisition forms that, from August, 1991 through early 1993, did not list the
contents of the Hepatitis panel on the front of the form and did not offer
physicians the option of ordering LIFECHEM's Hepatitis panel without the
Hepatitis C test.

                                      49
<PAGE>

          j.  From in or about 1991 through 1994, certain members of the MPD
sales force falsely informed some physicians and others that ordering the
LIFECHEM Hepatitis panel was the standard of care at the BMA's, falsely informed
physicians and others that ordering the tests in the LIFECHEM Hepatitis panel
was more economical than ordering tests separately as needed for individual
patients, and failed to provide material information to physicians and others
regarding the cost to Medicare for the often medically unnecessary Hepatitis C
tests and IgM Core tests included on LIFECHEM's Hepatitis panel.

          k.  In or about June, 1992, MPD announced a new commission program
designed to increase sales of LIFECHEM's Hepatitis panel by paying each sales
representative $3.00 for each additional Hepatitis panel sold with the Hepatitis
C test, and $2.00 per panel for every Hepatitis panel sold without the Hepatitis
C test.

          l.   In or about August, 1992, LIFECHEM's General Manager sought and
received approval from the President of NMC, and the President and the Vice
President of Finance of MPD, and others, to purchase equipment for LIFECHEM to
perform the anticipated additional Hepatitis tests resulting from the further
sales and marketing efforts, and she informed them that the projected increase
in 1992 revenues would be $763,000 with PFO by $465,000 as a result of the
additional testing to be performed by  LIFECHEM.

          m.   From in or about January, 1993 through June, 1994, LIFECHEM
purchased and installed a computerized laboratory test

                                      51
<PAGE>

ordering system in both BMA and non-BMA dialysis clinics, which system included
software that did not include on the computerized ordering screen the contents
of the Hepatitis panel, and that made it difficult to order the Hepatitis panel
without the added Hepatitis C test, and that made it difficult to order
Hepatitis tests for individual patients based upon their serologic status.

          n.   From in or about January, 1993 through June, 1994, LIFECHEM
directed the sales force of MPD, and others, to install the computers and to
instruct employees of the dialysis facilities about how to set up standing
orders, and how to use an "assign all" function on the LIFECHEM computerized
ordering system, that would assign the test for all patients, or a designated
group of patients, in a dialysis facility, and would assign for billing purposes
and insert into the computer the same ICD-9 diagnosis code as the medical
justification for performing a particular laboratory blood test for each and
every patient, or group of patients, at a given facility, regardless of each
individual patient's medical condition.

          o.  From in or about March, 1994 through June, 1994, LIFECHEM utilized
the MPD sales force to install LIFECHEM's computerized ordering system at the
BMAs, despite the potential for abuse by a sales force whose commissions were
tied directly to the number of BMA orders for particular enumerated laboratory
tests, such as Hepatitis panels, and which, in some cases, resulted in increased
medically unnecessary laboratory blood testing and caused the addition of tests
to orders for individual patients without the physician's knowledge or approval.

                                      51
<PAGE>

          p.   From in or about August, 1991 through June, 1997, the defendant
LIFECHEM submitted false, fictitious and fraudulent claims to the Medicare
Program for Hepatitis B IgM Core tests that the defendant LIFECHEM knew were not
medically necessary for the diagnosis or treatment of a Medicare Program
beneficiary, and without disclosing that lack of medical necessity to the
Medicare Program, HCFA, or any carriers employed by the Medicare Program for the
processing and payment of claims. By this conduct, the defendant LIFECHEM
received at least $8,000,000 in payment from Medicare to which LIFECHEM was not
entitled. Among many other medically unnecessary Hepatitis B IgM Core tests that
LIFECHEM caused to be billed to the Medicare Program were the following tests,
conducted on or about the dates set forth below, and billed to the Medicare
Program on or about the dates set forth below, using the "HIC" code indicated:
- ---------------------------------------------------------------------------
     HIC No.           Date of Service         Date Claim Submitted
- -----------------  -----------------------  -------------------------------
Patient A               8/15/94                 8/23/94
- ---------------------------------------------------------------------------
Patient A               9/19/94                 9/27/94
- ---------------------------------------------------------------------------
Patient A              10/17/94                10/24/94
- ---------------------------------------------------------------------------
Patient A              11/14/94                11/22/94
- ---------------------------------------------------------------------------
Patient A              12/12/94                12/19/94
- ---------------------------------------------------------------------------
Patient A                1/2/95                 1/17/95
- ---------------------------------------------------------------------------
Patient A                2/6/95                 2/16/95
- ---------------------------------------------------------------------------
Patient A                3/6/95                 3/14/95
- ---------------------------------------------------------------------------
Patient A                4/3/95                 4/20/95
- ---------------------------------------------------------------------------
Patient A                5/1/95                  5/8/95
- ---------------------------------------------------------------------------
Patient B                8/3/94                 8/10/94
- ---------------------------------------------------------------------------
Patient B                9/7/94                 9/14/94

                                      52
<PAGE>

- ---------------------------------------------------------------------------
Patient B              10/5/94                  10/14/94
- ---------------------------------------------------------------------------
Patient B              11/9/94                  11/15/94
- ---------------------------------------------------------------------------
Patient B              12/7/94                  12/13/94
- ---------------------------------------------------------------------------
Patient B               1/4/95                   1/17/95
- ---------------------------------------------------------------------------
Patient B               2/8/95                   2/23/95
- ---------------------------------------------------------------------------
Patient B               3/8/95                   3/14/95
- ---------------------------------------------------------------------------
Patient B               5/3/95                    5/9/95
- ---------------------------------------------------------------------------
Patient B               7/5/95                   7/17/95
- ---------------------------------------------------------------------------
Patient B               8/9/95                   8/15/95
- ---------------------------------------------------------------------------
Patient B               9/6/95                   9/12/95
- ---------------------------------------------------------------------------
Patient C               8/1/94                    8/8/94
- ---------------------------------------------------------------------------
Patient C              9/12/94                   9/22/94
- ---------------------------------------------------------------------------
Patient C              10/3/94                  10/10/94
- ---------------------------------------------------------------------------
Patient C              11/7/94                  11/14/94
- ---------------------------------------------------------------------------
Patient C              12/5/94                  12/19/94
- ---------------------------------------------------------------------------
Patient C               1/9/95                   1/19/95
- ---------------------------------------------------------------------------
Patient C               2/6/95                   2/16/95
- ---------------------------------------------------------------------------
Patient C               3/6/95                   3/16/96
- ---------------------------------------------------------------------------
Patient D               8/4/95                   8/15/94
- ---------------------------------------------------------------------------
Patient D               9/8/94                   9/19/94
- ---------------------------------------------------------------------------
Patient D              10/6/94                  10/12/94
- ---------------------------------------------------------------------------
Patient D              11/3/94                  11/10/94
- ---------------------------------------------------------------------------
Patient D              12/8/94                  12/19/94
- ---------------------------------------------------------------------------
Patient D               1/5/95                   1/17/95
- ---------------------------------------------------------------------------
Patient D               2/2/95                   2/14/95
- ---------------------------------------------------------------------------
Patient D               3/2/95                    3/9/95
- ---------------------------------------------------------------------------
Patient D               4/7/95                   4/21/95
- ---------------------------------------------------------------------------
Patient D               5/4/95                   5/11/95
- ---------------------------------------------------------------------------
Patient D               6/8/95                   6/15/95
- ---------------------------------------------------------------------------
Patient D               7/6/95                   7/14/95
- ---------------------------------------------------------------------------
Patient D               8/3/95                    8/8/95

                                      53
<PAGE>

- ---------------------------------------------------------------------------
Patient E               8/8/94                   8/15/94
- ---------------------------------------------------------------------------
Patient E              9/13/94                   9/20/94
- ---------------------------------------------------------------------------
Patient E             10/10/94                  10/18/94
- ---------------------------------------------------------------------------
Patient E             11/14/94                  11/21/94
- ---------------------------------------------------------------------------
Patient E             12/12/94                  12/19/94
- ---------------------------------------------------------------------------
Patient E               1/9/95                   1/24/95
- ---------------------------------------------------------------------------
Patient E              2/13/95                   2/28/95
- ---------------------------------------------------------------------------
Patient E              3/13/95                   3/23/95
- ---------------------------------------------------------------------------
Patient E              4/10/95                   4/21/95
- ---------------------------------------------------------------------------
Patient E               5/8/95                   5/15/95
- ---------------------------------------------------------------------------
Patient E              7/17/95                   7/25/95
- ---------------------------------------------------------------------------
Patient E              8/21/95                   8/29/95
- ---------------------------------------------------------------------------
Patient F               2/8/95                   2/27/95
- ---------------------------------------------------------------------------
Patient F               4/6/95                   4/20/95
- ---------------------------------------------------------------------------
Patient F               5/3/95                   5/11/95
- ---------------------------------------------------------------------------
Patient F               6/7/95                   6/15/95
- ---------------------------------------------------------------------------
Patient F               7/5/95                   7/14/95
- ---------------------------------------------------------------------------
Patient F               8/9/95                   8/17/95
- ---------------------------------------------------------------------------
Patient F               9/6/95                   9/12/95
- ---------------------------------------------------------------------------

          q.   From in or about August, 1991 through June, 1997, the defendant
LIFECHEM submitted false, fictitious and fraudulent claims for payment to the
Medicare Program for Hepatitis C antibody tests that LIFECHEM knew were not
medically necessary for the diagnosis or treatment of a Medicare Program
beneficiary, and without disclosing that lack of medical necessity to the
Medicare Program, HCFA, or any carriers employed by the Medicare Program for the
processing and payment of claims.  By this conduct, LIFECHEM received at least
$1,900,000 in payment to

                                      54
<PAGE>

which LIFECHEM was not entitled. Among many other medically unnecessary
Hepatitis B IgM Core tests that LIFECHEM caused to be billed to the Medicare
Program were the following tests, conducted on or about the dates set forth
below, and billed to the Medicare Program on or about the dates set forth below,
using the "HIC" code indicated:

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------
     HIC No.                   Date of Service         Date Claim Submitted
     -------                   ---------------         --------------------
- ---------------------------------------------------------------------------
<S>                            <C>                     <C>
Patient A                          8/15/94                      8/23/94
- ---------------------------------------------------------------------------
Patient A                          9/19/94                      9/27/94
- ---------------------------------------------------------------------------
Patient A                         10/17/94                     10/24/94
- ---------------------------------------------------------------------------
Patient A                         11/14/94                     11/22/94
- ---------------------------------------------------------------------------
Patient A                         12/12/94                     12/19/94
- ---------------------------------------------------------------------------
Patient A                           1/2/95                      1/17/95
- ---------------------------------------------------------------------------
Patient A                           2/6/95                      2/16/95
- ---------------------------------------------------------------------------
Patient A                           3/6/95                      3/14/95
- ---------------------------------------------------------------------------
Patient A                           4/3/95                      4/20/95
- ---------------------------------------------------------------------------
Patient A                           5/1/95                       5/8/95
- ---------------------------------------------------------------------------
Patient B                           8/3/94                      8/10/94
- ---------------------------------------------------------------------------
Patient B                           9/7/94                      9/14/94
- ---------------------------------------------------------------------------
Patient B                          10/5/94                     10/14/94
- ---------------------------------------------------------------------------
Patient B                          11/9/94                     11/15/94
- ---------------------------------------------------------------------------
Patient B                          12/7/94                     12/13/94
- ---------------------------------------------------------------------------
Patient B                           1/4/95                      1/17/95
- ---------------------------------------------------------------------------
Patient B                           2/8/95                      2/23/95
- ---------------------------------------------------------------------------
Patient B                           3/8/95                      3/14/95
- ---------------------------------------------------------------------------
Patient B                           5/3/95                       5/9/95
- ---------------------------------------------------------------------------
Patient B                           7/5/95                      7/17/95
- ---------------------------------------------------------------------------
Patient B                           8/9/95                      8/15/95
- ---------------------------------------------------------------------------
Patient B                           9/6/95                      9/12/95
- ---------------------------------------------------------------------------
Patient C                           8/1/94                       8/8/94
- ---------------------------------------------------------------------------
</TABLE>
<PAGE>

<TABLE>
- ---------------------------------------------------------------------------
<S>                               <C>                          <C>
Patient C                          9/12/94                      9/22/94
- ---------------------------------------------------------------------------
Patient C                          10/3/94                     10/10/94
- ---------------------------------------------------------------------------
Patient C                          11/7/94                     11/14/94
- ---------------------------------------------------------------------------
Patient C                          12/5/94                     12/19/94
- ---------------------------------------------------------------------------
Patient C                           1/9/95                      1/19/95
- ---------------------------------------------------------------------------
Patient C                           2/6/95                      2/16/95
- ---------------------------------------------------------------------------
Patient C                           3/6/95                      3/16/96
- ---------------------------------------------------------------------------
Patient D                           8/4/95                      8/15/94
- ---------------------------------------------------------------------------
Patient D                           9/8/94                      9/19/94
- ---------------------------------------------------------------------------
Patient D                          10/6/94                     10/12/94
- ---------------------------------------------------------------------------
Patient D                          11/3/94                     11/10/94
- ---------------------------------------------------------------------------
Patient D                          12/8/94                     12/19/94
- ---------------------------------------------------------------------------
Patient D                           1/5/95                      1/17/95
- ---------------------------------------------------------------------------
Patient D                           2/2/95                      2/14/95
- ---------------------------------------------------------------------------
Patient D                           3/2/95                       3/9/95
- ---------------------------------------------------------------------------
Patient D                           4/7/95                      4/21/95
- ---------------------------------------------------------------------------
Patient D                           5/4/95                      5/11/95
- ---------------------------------------------------------------------------
Patient D                           6/8/95                      6/15/95
- ---------------------------------------------------------------------------
Patient D                           7/6/95                      7/14/95
- ---------------------------------------------------------------------------
Patient D                           8/3/95                       8/8/95
- ---------------------------------------------------------------------------
Patient E                           8/8/94                      8/15/94
- ---------------------------------------------------------------------------
Patient E                          9/13/94                      9/20/94
- ---------------------------------------------------------------------------
Patient E                         10/10/94                     10/18/94
- ---------------------------------------------------------------------------
Patient E                         11/14/94                     11/21/94
- ---------------------------------------------------------------------------
Patient E                         12/12/94                     12/19/94
- ---------------------------------------------------------------------------
Patient E                           1/9/95                      1/24/95
- ---------------------------------------------------------------------------
Patient E                          2/13/95                      2/28/95
- ---------------------------------------------------------------------------
Patient E                          3/13/95                      3/23/95
- ---------------------------------------------------------------------------
Patient E                          4/10/95                      4/21/95
- ---------------------------------------------------------------------------
Patient E                           5/8/95                      5/15/95
- ---------------------------------------------------------------------------
Patient E                          7/17/95                      7/25/95
- ---------------------------------------------------------------------------
</TABLE>
<PAGE>

_______________________________________________________________________
Patient E                          8/21/95                      8/29/95
- -----------------------------------------------------------------------
Patient F                           2/8/95                      2/27/95
- -----------------------------------------------------------------------
Patient F                           4/6/95                      4/20/95
- -----------------------------------------------------------------------
Patient F                           5/3/95                      5/11/95
- -----------------------------------------------------------------------
Patient F                           6/7/95                      6/15/95
- -----------------------------------------------------------------------
Patient F                           7/5/95                      7/14/95
- -----------------------------------------------------------------------
Patient F                           8/9/95                      8/17/95
- -----------------------------------------------------------------------
Patient F                           9/6/95                      9/12/95
- -----------------------------------------------------------------------


          r.   From in or about August, 1991 through June, 1997, the defendant
LIFECHEM submitted false, fictitious and fraudulent claims to CHAMPUS for
Hepatitis B IgM Core tests that LIFECHEM knew were not medically necessary for
the diagnosis or treatment of the medical condition of a CHAMPUS beneficiary,
and without disclosing that lack of medical necessity to the CHAMPUS Program.
By this conduct, LIFECHEM received payments for these tests from CHAMPUS to
which LIFECHEM was not entitled.  Among other medically unnecessary Hepatitis B
IgM Core tests that LIFECHEM caused to be billed to CHAMPUS were the following
tests, conducted on or about the dates set forth below, and reimbursed by
CHAMPUS on or about the dates set forth below:


- ----------------------------------------------------------------------
 Patient/Test              Date of Service        Reimbursement Date
 ------------              ---------------        ------------------
- ----------------------------------------------------------------------
Patient X/IgM Core         5/4/95                  9/5/95
- ----------------------------------------------------------------------
Patient Y/IgM Core         5/4/95                  9/5/95
- ----------------------------------------------------------------------
Patient Y/IgM Core         6/8/95                 7/22/95
- ----------------------------------------------------------------------
Patient Y/IgM Core         7/6/95                 8/21/95
- ----------------------------------------------------------------------
Patient Y/IgM COre         8/2/95                 9/16/95
- ----------------------------------------------------------------------


          s.   In or about June, 1990, LIFECHEM installed a new

                                     57
<PAGE>

computer billing system and began submitting claims for payment to the Medicare
program that were generated by that new computer system, despite the fact that
the billing computer had not been completely programmed with the Medicare ESRD
billing rules, and the billing computer had not been parallel tested to
determine whether or not it generated accurate claims for payment.

          t.   By July, 1990, LIFECHEM knew that the new billing computer was
generating inaccurate claims for payment for laboratory blood tests conducted on
ESRD patients but continued to submit those false claims for payment to the
Medicare Program.

          u.   In or about February, 1991, LIFECHEM discovered a computer
programming error that caused the new billing computer to generate claims for
payment to the Medicare program for individual chemistry tests that were
performed in the laboratory on a automated chemistry analyzer as part of
LIFECHEM's automated Chem 20, despite the fact that Medicare had already paid
for the monthly Chem 20 for most ESRD patients by directly paying the dialysis
facilities the Composite Rate Payment.

          v.   From in or about February, 1991 through at least June, 1992,
LIFECHEM submitted false, fictitious and fraudulent claims for payment for
individual chemistry tests for which LIFECHEM knew Medicare had already paid,
without disclosing to the Medicare Program that those claims for payment were
duplicate bills to the Medicare Program, HCFA, or any carriers employed by the
Medicare Program for the processing and payment of claims. By this conduct,
LIFECHEM received at least $5,300,000 in payment to which LIFECHEM was not
entitled.

                                      58
<PAGE>

     All in violation of Title 18, United States Code, Section 286.

                                      59
<PAGE>

     COUNT THREE   (18 U.S.C. (S) 371 -- Conspiracy to Commit an Offense)
     -----------


     151. The allegations set forth in paragraphs 1-3, 5-16, and 134-145
are realleged as if fully set forth herein and incorporated in full.

     152. From in or about May, 1987 through in or about July, 1996, the exact
dates being unknown to the United States Attorney, in the Districts of
Massachusetts, Florida, North Carolina, and New Jersey, and elsewhere across the
United States, the defendant

     NMC MEDICAL PRODUCTS, INC.

together with others known and unknown to the United States Attorney, knowingly,
willfully, and intentionally combined, conspired, confederated and agreed to
commit an offense against the United States and its agency the Health Care
Financing Administration, namely, to knowingly, willfully and intentionally
offer and pay remuneration, directly and indirectly, overtly and covertly, in
cash and in kind, to induce dialysis facilities to order, and arrange for the
ordering, from LIFECHEM of a service and item paid for, in whole or in part, by
the Medicare Program, specifically clinical laboratory blood testing conducted
for dialysis patients in the facilities, all in violation of Title 42, United
States Code, Section 1320a-7b(b)(2)(B).

                                      60
<PAGE>

                          OBJECTIVE OF THE CONSPIRACY
                          ---------------------------

     153.   The objective of the conspiracy was to offer and give things of
value to dialysis clinics, and to their employees, owners, and administrators,
for the purpose of inducing dialysis clinics to order, and to arrange for the
ordering of LIFECHEM's laboratory blood testing services, including Non-Routine
Tests and medically unnecessary laboratory blood tests for dialysis patients,
which services were paid for primarily by Medicare.

                       MANNER AND MEANS OF THE CONSPIRACY
                       ----------------------------------

     154.   It was a part of the manner and means by which the conspiracy was
accomplished that the defendant MPD, together with others known and unknown to
the United States Attorney, offered and paid remuneration to certain dialysis
facilities in the form of lavish entertainment and hunting trips, payment of
salary and benefits for full-time dialysis center staff who were not devoted to
spinning and packaging blood tests for shipment to LIFECHEM, payment of study
grants for research that was never performed, and payment of up-front rebates on
dialysis products based upon commitments to purchase certain volumes of product
that were never met, all for the purpose of inducing the referral of orders for
laboratory blood testing services to LIFECHEM, including orders for Non-Routine
Tests that were not medically necessary for the diagnosis or treatment of
Medicare beneficiaries, which services were paid for primarily by Medicare Trust
Funds.

     155.   As a result of MPD's knowing, willful and intentional payment of
illegal remuneration to various dialysis facilities to obtain referral of their
laboratory blood testing business to

                                      61
<PAGE>

LIFECHEM, MPD generated an unlawful pecuniary gain or profit from that
laboratory business in an amount of at least $9,500,000.

                                   OVERT ACTS
                                   ----------

     156. In furtherance of the conspiracy, the defendant MPD, together with
others known and unknown to the United States Attorney, committed among other
acts the following overt acts in the District of Massachusetts and elsewhere:

          a.    In or about 1992, MPD knowingly, willfully and intentionally
offered and paid to the manager/administrator of Dialysis Facility I illegal
remuneration in the form of payment for a bear hunting trip to Canada to induce
him to refer Dialysis Facilities I's laboratory blood testing business to
LIFECHEM.

          b.    At various times between May, 1987 and January, 1995, MPD
knowingly, willfully and intentionally offered and paid to Dialysis Facility F
illegal remuneration in the form of payment of salary and benefits for two full-
time dialysis center personnel whose responsibilities were not limited to
spinning and packaging blood for shipment to LIFECHEM but included
administrative, clerical and nursing practitioner work, and in the form of
grants for studies that were never performed, all to induce referrals of
Dialysis Facility F's laboratory blood testing business to LIFECHEM;

          c.    In or about December, 1990, MPD knowingly, willfully and
intentionally offered and paid to Dialysis Facility G illegal remuneration in
the form of payment for lavish holiday entertainment parties including a yacht
rental worth thousands of dollars to induce referrals of dialysis facility G's
laboratory blood testing business to LIFECHEM; and

          d.    At various times between 1991 and 1993, MPD knowingly, willfully
and intentionally offered and paid to Dialysis Facilities B and J illegal
remuneration in the form of an up-front credit on

                                      62
<PAGE>

dialysis products based upon a commitment to purchase a specified volume of
dialysis products that was not met, to induce referrals of Dialysis Facilities B
and J's laboratory blood testing business to LIFECHEM. All in violation of Title
18 United States Code, Section 371.

                              Respectfully submitted,

                              MARK W. PEARLSTEIN
                              Acting United States Attorney




                              /s/ Peter A. Mullin
                              ---------------------------
                              PETER A. MULLIN
                              Assistant U.S. Attorney


                              /s/ Susan Winkler
                              ---------------------------
                              SUSAN G. WINKLER
                              Assistant U.S. Attorney

                              /s/ Susan Hanson-Philbrick
                              ---------------------------
                              SUSAN HANSON-PHILBRICK
                              Assistant U.S. Attorney

                              /s/ Joshua Levy
                              ---------------------------
                              JOSHUA LEVY
- ----------------------------  Assistant U.S. Attorney
Dated: January 19, 2000

                                      63

<PAGE>

                                                                    Exhibit 10.7

                                                      U.S. Department of Justice


                                                       United States Attorney
                                                       District of Massachusetts


Main Reception: (617) 748-3100             United States Courthouse,  Suite 9200
                                           1 Courthouse Way
                                           Boston, Massachusetts  02210

                                                                January 13, 2000

BY HAND

Jonathan Chiel                               Jeffrey E. Stone
Choate, Hall & Stewart                       McDermott, Will & Emery
Exchange Place                               227 West Monroe Street
53 State Street                              Chicago, IL 60606-5096
Boston, MA 02109-2891

Alan E. Reider, Esq.                         Harold Damelin
Breckinridge L. Willcox                      Powers, Pyles, Sutter & Verville
Arent, Fox, Kintner, Plotkin & Kahn          Twelfth Floor
1050 Connecticut Avenue, NW                  1875 Eye Street, NW
Washington, D.C. 20036                       Washington, DC 20006-5409

Re:  NMC Medical Products, Inc.
     --------------------------

Dear Gentlemen:

     This letter sets forth the Agreement between the United States Department
of Justice and the United States Attorney for the District of Massachusetts
(collectively referred to as the "United States") and your client, NMC Medical
Products, Inc., ("MPD"), a Delaware corporation, formerly known as National
Medical Care Medical Products Division, Inc., and before that as Erika, Inc.
Collectively, the United States and MPD will be referred to as "the Parties."

     1.   Guilty Plea
          -----------

     On or before January 19, 2000, or such other date as the Court may set, MPD
shall waive indictment and plead guilty to Count Three in the Information
attached hereto as Exhibit A, which charges MPD with a violation of 18 U.S.C.
(S) 371, a conspiracy to commit an offense

                                       1
<PAGE>

against the United States, namely, to offer and pay remuneration to induce
dialysis facilities to order and arrange for the ordering from LifeChem, Inc. of
a service or item paid for, in whole or in part, by the Medicare Program,
specifically clinical laboratory blood testing conducted for dialysis patients,
in violation of Title 42, United States Code, Section 1320a-7b(b)(2)(B).

     2.   Sentencing Guidelines
          ---------------------

     The United States and MPD agree that the following provisions of the United
States Sentencing Guidelines ("U.S.S.G.") apply to sentencing of MPD with
respect to Count Three of the Information:

          (a)  pursuant to U.S.S.G. (S) 8C2.4(a), the loss to the United States
               from this offense for criminal sentencing purposes is $9,500,000;

          (b)  pursuant to U.S.S.G. (S) 8C2.5, the culpability score is 7,
               calculated as follows:

               (1)   base score of 5 pursuant to (S) 8C2.5(a);

               (2)   add 4 points pursuant to (S) 8C2.5(b)(2)(A)(i) and (ii);

               (3)   deduct 2 points pursuant to (S) 8C2.5(g)(2).

          (c)  pursuant to (S) 8C2.6, the applicable range for a multiplier is
               1.4 to 2.8, and the appropriate multiplier to be applied to MPD
               is 1.6.

          (d)  the Parties agree that there is no basis for a departure from the
               Sentencing Guidelines, either upward or downward.

     4.   Agreed Disposition
          ------------------

     The United States and MPD agree pursuant to Fed. R. Crim. P. 11(e)(1)(C)
that the following sentence is the appropriate disposition of Count Three of the
Information:

          (a)  a criminal fine in the amount of fifteen million two hundred
               thousand dollars ($15,200,000) to be paid as follows:

               (1)   the amount of seven million five hundred ten thousand
                     dollars ($7,510,000) shall be paid within fifteen days of
                     sentencing;

               (2)   a amount of three million eight hundred forty five thousand
                     dollars ($3,845,000) shall be paid on or before April 16,
                     2001; and

                                       2
<PAGE>

               (2)   an amount of three million eight hundred forty five
                     thousand dollars ($3,845,000) shall be paid on or before
                     July 16, 2001.

          (b)  a mandatory special assessment of $400 pursuant to 18 U.S.C. (S)
               3013, which shall be paid to the Clerk of Court on or before the
               date of disposition;

MPD acknowledges that it is obligated, pursuant to 18 U.S.C. (S) 3612(f), to pay
interest on that portion of the fine which is not paid on or before the
fifteenth day after the Court enters judgment in this matter.

     In light of the pending civil action, United States ex rel. Jay A. Buford,
                                           ------------------------------------
et al. v. LifeChem, Inc., Erika, Inc., et al., Civil Action No. 95-10742-NG (D.
- ---------------------------------------------
Mass.), and the settlement agreement between MPD and others and the United
States relating to the civil action which is being signed simultaneously with
this Plea Agreement (the "civil Settlement Agreement"), the parties agree the
complication and prolongation of the sentencing process that would result from
an attempt to fashion a proper restitution order outweighs the need to provide
restitution to the victims in this case, where, as here, the loss suffered by
the Medicare program will be recompensed from amounts paid in the civil
Settlement Agreement.  See, 18 U.S.C. (S) 3663(a)(1)(B)(ii).  Therefore, the
                       ---
United States agrees that it will not seek a separate restitution order as to
the defendant MPD as a part of the resolution of Count Three of the Information.

     4.   No Further Prosecution of Defendant
          -----------------------------------

     The United States agrees that, other than the charge in Count Three of the
attached Information and the exception set forth below, it shall not further
prosecute MPD for conduct which (a) falls within the scope of the conspiracy
which is charged in Count Three of the Information; (b) was within the scope of
the grand jury investigation conducted by the U.S. Attorney; or (c) was known to
the U.S. Attorney prior to the date of execution of this letter.

     The United States expressly reserves the right to prosecute any individual,
including but not limited to present and former officers, directors, employees
and agents of MPD, in connection with the conduct encompassed by this Plea
Agreement or within the scope of the grand jury investigation.

     5.   Probation Department Not Bound By Agreement
          -------------------------------------------

     The Parties acknowledge that the disposition agreed upon by the Parties and
their calculations under the Sentencing Guidelines are not binding upon the
United States Probation Office.

                                       3
<PAGE>

     6.   Fed. R. Civ. P. 11(e)(1)(C) Agreement
          -------------------------------------

     MPD's plea shall be tendered pursuant to Fed. R. Crim. P. 11(e)(1)(C). MPD
cannot withdraw its plea of guilty unless the sentencing judge rejects this Plea
Agreement. If the sentencing judge rejects the guilty plea, this Plea Agreement
shall be null and void at the option of either the United States or MPD, except
as set forth in Paragraph 8 below. If MPD's guilty plea is withdrawn on MPD's
motion for any reason, this Plea Agreement shall be null and void at the option
of the United States, except as set forth in Paragraph 8 below.

    7.    Civil and Administrative Liability
          ----------------------------------

    By entering into this Plea Agreement, the United States does not compromise
any civil or administrative liability, including but not limited to any False
Claims Act or tax liability, which MPD may have incurred or may incur as a
result of its conduct and its plea of guilty to Count Three of the attached
Information.

     8.   Waiver of Defenses
          ------------------

     In the event that MPD's guilty plea is not accepted by the Court for
whatever reason, or is later withdrawn for whatever reason, MPD waives, and
agrees not to interpose, any defense it might otherwise have under any statute
of limitations or the Speedy Trial Act, except any such defense that MPD may
already have for conduct occurring before March 1, 1994, if charges are filed
within 90 days of the date on which such guilty plea is rejected or withdrawn.

     9.   Breach of Agreement
          -------------------

     If the United States Attorney determines that MPD has failed to comply with
any provision of this Plea Agreement, or has committed any crime between the
date of this letter and the date of sentencing in this matter, the United States
may, at its sole option, be released from its commitments under this Plea
Agreement in their entirety by notifying MPD, through counsel or otherwise, in
writing.  The United States may also pursue all remedies available under the
law, irrespective of whether it elects to be released from its commitments under
this Plea Agreement.  MPD recognizes that no breach by MPD of any obligation
under this Plea Agreement shall give rise to grounds for withdrawal of its
guilty plea. MPD understands that, should it breach any provision of this Plea
Agreement, the United States will have the right to use against MPD before any
grand jury, at any trial or hearing, or for sentencing purposes, any statements
which may be made by MPD, and any information, materials, documents or objects
which may be provided by it to the government subsequent to this Plea Agreement,
without any limitation.

     10.  Corporate Authorization
          -----------------------

     MPD shall provide to the United States and the Court a certified copy of a
resolution of the Board of Directors of MPD, affirming that the Board of
Directors has authority to enter into the Plea Agreement and has (1) reviewed
the Information in this case and the proposed Plea Agreement in their entirety;
(2) consulted with legal counsel of MPD's choice in connection with the matter;
(3) voted to enter into the proposed Plea Agreement; (4) voted to authorize MPD
to

                                       4
<PAGE>

plead guilty to Count Three of the Information; and (5) voted to authorize the
corporate officer identified below to execute the Plea Agreement and all other
documents necessary to carry out the provisions of the Plea Agreement. MPD
agrees that counsel identified below will appear on behalf of MPD and enter the
guilty plea and will also appear for the imposition of sentence.

     11.  Who Is Bound By Agreement
          -------------------------

     This Plea Agreement binds MPD and the United States Department of Justice,
including each of its United States Attorney's offices, but can not and does not
bind the Tax Division of the U.S. Department of Justice, the Internal Revenue
Service of the U.S. Department of Treasury, or any other federal, state or local
prosecutive authority.

     12.  Complete Agreement
          ------------------

     With regard to the disposition of Count Three of the attached Information,
this Plea Agreement is the complete and only agreement between the Parties.   No
promises, representations, agreements or conditions have been entered into other
than those set forth in this letter in connection with that charge.  This Plea
Agreement supersedes prior understandings, if any, of the parties, whether
written or oral in connection with the disposition of Count Three.  This Plea
Agreement can be modified or supplemented only in a written memorandum signed by
the Parties or on the record in court.

     If this letter accurately reflects the Agreement entered into between the
United States and your client, NMC Medical Products, Inc., please sign the
Acknowledgment of Plea Agreement below, provide evidence of the requisite
authorization to enter into this Plea Agreement, and return the original of this
letter to Assistant U.S. Attorneys Susan G. Winkler and Susan Hanson-Philbrick.

                                                 Very truly yours,


                                                 /s/ Mark W. Pearlstein
                                             By: ---------------------------
                                                 MARK W. PEARLSTEIN
                                                 Acting United States Attorney
                                                 District of Massachusetts


                                                 /s/ John C. Keeney (mwp)
                                             By: ---------------------------
                                                 JOHN C. KEENEY
                                                 Deputy Assistant
                                                 Attorney General
                                                 Criminal Division
                                                 Department of Justice

                                       5
<PAGE>

                 CORPORATE ACKNOWLEDGMENT OF PLEA AGREEMENT
                 ------------------------------------------

     The Directors of NMC Medical Products, Inc. have read this Plea Agreement,
and the attached criminal Information in their entirety, and have discussed this
matter with legal counsel of the corporation's choosing, including undersigned
counsel. As set forth in the attached resolution, the Board of Directors has
authorized me, as an officer of the corporation, to enter into this Plea
Agreement on behalf of the corporation. I hereby acknowledge, on behalf of NMC
Medical Products, Inc., that this letter fully sets forth NMC Medical Products,
Inc.'s agreement with the U.S. Attorney relating to the disposition of Count
Three of the attached Information, and that no additional promises or
representations have been made to the corporation by any official of the United
States in connection with the disposition of that charge. NMC Medical Products,
Inc. is entering into this Agreement freely, voluntarily and knowingly because
it is guilty of the offense set forth in Count Three of the Information and it
believes this Plea Agreement is in its best interest.

                                      /s/ Ben J. Lipps
Dated: 1/18/00                        -----------------------------------
                                      Ben J. Lipps
                                      President, NMC Medical Products, Inc.


                                      /s/ Jonathan Chiel
Dated: January 18, 2000               ------------------------------------
                                      Jonathan Chiel
                                      Choate, Hall & Stewart


                                      /s/ Alan E. Reider
Dated: 1/18/00                        ------------------------------------
                                      Alan E. Reider
                                      Arent, Fox, Kintner, Plotkin & Kahn


                                      /s/ Breckinridge L. Wilcox
Dated: 1/18/00                        ------------------------------------
                                      Breckinridge L. Willcox
                                      Arent, Fox, Kintner, Plotkin & Kahn


                                      /s/ Jeffrey E. Stone
Dated: January 18, 2000               ------------------------------------
                                      Jeffrey E. Stone
                                      McDermott, Will & Emery


                                      /s/ Harold Damelin
Dated: 1/18/2000                      ------------------------------------
                                      Harold Damelin
                                      Powers, Pyles, Sutter & Verville

                                      Attorneys for NMC Medical Products, Inc.

                                       6
<PAGE>

                                   EXHIBIT A
                                 (Information)

The Information dated January 19, 2000 is incorporated by reference to Exhibit A
of Exhibit 10.6 to this Current Report on Form 8-K.


<PAGE>

                                                                    EXHIBIT 10.8

                                           U.S. Department of Justice


                                           United States Attorney
                                           District of Massachusetts


Main Reception: (617) 748-3100             United States Courthouse,  Suite 9200
                                           1 Courthouse Way
                                           Boston, Massachusetts  02210


                                      January 13, 2000

By Hand
- -------

Jonathan Chiel, Esquire               Jeffrey E. Stone, Esquire
Choate, Hall & Stewart                McDermott, Will & Emery
Exchange Place                        222 West Monroe Street
Boston, MA 02109                      Chicago, IL 60606-5096

Alan E. Reider, Esquire               Harold Damelin, Esquire
Breckinridge L. Willcox, Esquire      Powers, Pyles, Sutter &
Arent, Fox, Kintner, Plotkin           & Verville
& Kahn                                12th Floor
1050 Connecticut Avenue, N.W.         1875 Eye Street, NW
Washington D.C. 20036-5339            Washington, D.C. 20006-55409

Re:  United States v. NMC Homecare, Inc.
     -----------------------------------

Gentlemen:

     This letter sets forth the agreement between the United States Department
of Justice and the United States Attorney for the District of Massachusetts
(hereinafter collectively the "United States") and your client, NMC Homecare,
Inc., a Delaware corporation ("NMC Homecare" or "the Defendant"), relating to
the U.S. Attorney's criminal investigation of NMC Homecare's IntraDialytic
Parenteral Nutrition ("IDPN") and Intraperitoneal Nutrition ("IPN") program.
The Agreement ("Plea Agreement") is as follows:

1.   Guilty Plea
     -----------

     On or before January 19, 2000, or such other date as the Court may set, the
Defendant shall waive indictment and plead guilty to Count One of the criminal
Information attached hereto as Exhibit A, which charges the Defendant with
conspiracy to defraud the United States, in violation of 18 U.S.C. (S) 371.
<PAGE>

     2.   Sentencing Guidelines
          ---------------------

     The United States and the Defendant agree that the following provisions of
the United States Sentencing Guidelines (8U.S.S.G.") apply to the sentencing of
this Defendant on Count One of the Information:

          a.   The loss to the United States from this offense, for criminal
               sentencing purposes, pursuant to U.S.S.G. (S)8C2.4(a), is

               (1)    IDPN administration kits            $ 3,480,000
               (2)    False statements and material       $25,398,103
                       omissions
               (3)    Hang fees and other inducements     $ 6,368,824

                      Total                               $35,246,927

          b.   The culpability score, pursuant to U.S.S.G. (S)8C2.5, is seven
               (7), calculated as follows:

               (1)    Base score is 5 ((S)8C2.5(a));

               (2)  Add 4 points pursuant to (S)8C2.5(b)(2)(A)(i) and (ii);

               (3)  Deduct 2 points pursuant to (S)8C2.5(g)(2).

          c.   The applicable multiplier range pursuant to U.S.S.G. (S)8C2.6 is
               1.4 to 2.8 and the multiplier to be applied as to this Defendant
               is 1.4.

          d.   There is no basis under the guidelines for a departure, either
               upward or downward.

     3.   Agreed Disposition.
          -------------------

     The United States and the Defendant agree, pursuant to Fed. R. Crim. P.
11(e)(l)(C), that the following sentence is the appropriate disposition of Count
One of this case:

          a.   A criminal fine of $49,345,698, payable as follows:

               1)   $24,385,000 within 15 days of sentencing;

               2)   $12,480,349 on or before April 16, 2001; and

               3)   $12,480,349 on or before July 16, 2001; and

                                       2
<PAGE>

          b.   A special assessment of $400, pursuant to 18 U.S.C.
               (S)3013(a)(2)(B), payable on or before the date of sentencing.

     The Defendant acknowledges that it is aware that it is obligated, pursuant
to 18 U.S.C. (S)3612(f), to pay interest on the portion of the fine which is not
paid before the fifteenth day after the date of the judgment of the Court in
this case.

     In light of the pending civil actions United States ex rel. Ven-A-Care of
                                           -----------------------------------
the Florida Keys Inc. v. National Medical Care, Inc., et. al., Civil Action No.
- ---------------------    -------------------------------------
97-10962-NG (D. Mass.) and United States ex rel. Dana R. Austin et al. v.
                           -------------------------------------------
National Medical Care, Inc., Civil Action No. 94-12164-NG (D. Mass.), and the
- ---------------------------
settlement agreement between National Medical Care, Inc. et al. and the United
                                                         -- --
States relating to those civil actions which is being signed contemporaneous
with this Plea Agreement, the parties agree the complication and prolongation of
the sentencing process that would result from an attempt to fashion a proper
restitution order outweighs the need to provide restitution to the victims in
this case.  See, 18 U.S.C. (S) 3663(a)(1)(B)(ii).  Therefore, the United States
agrees it will not seek a restitution order as to this Defendant.

     4.   No Further Prosecution of Defendant
          -----------------------------------

     The United States agrees that, other than the charge in Count One of the
attached Information, it shall not further prosecute the Defendant for conduct
which (1) falls within the scope of the conspiracy which is charged in Count One
of the Information; (2) was within the scope of the grand jury investigation
conducted by the U.S. Attorney; or (3) was known by the U.S. Attorney prior to
the date of this letter.

     The United States expressly reserves the right to prosecute any individual
with regard to the conduct encompassed by this Plea Agreement and the grand jury
investigation, including, but not limited to, present and former officers,
directors, employees and agents of the Defendant.

     5.   Probation Office Not Bound By Agreement
          ---------------------------------------

     The parties acknowledge that the disposition agreed upon by the parties and
their calculations under the Sentencing Guidelines are not binding upon the
United States Probation Office.

     6.   Fed. R. Crim. P. 11(e)(l)(C) Agreement
          --------------------------------------

     Defendant's plea will be tendered pursuant to Fed. R. Crim. P. 11(e)(l)(C).
Defendant cannot withdraw its plea of guilty unless the sentencing judge rejects
the Plea Agreement.  If the sentencing judge rejects the guilty plea, this Plea
Agreement shall be null and void at the option of either the United States or
the Defendant except as set forth in paragraph 8 below.  If the Defendant's
guilty plea is withdrawn on Defendant's motion for any reason, this Plea
Agreement shall be null and void at the option of the U.S. Attorney, except as
set forth in paragraph 8 below.

     7.   Civil and Administrative Liability
          ----------------------------------

                                       3
<PAGE>

     By entering into this Plea Agreement, the United States does not compromise
any civil or administrative liability, including but not limited to, any False
Claims Act, or tax liability, which Defendant may have incurred or may incur as
a result of its conduct and its plea of guilty to the charge specified in
paragraph l of this Plea Agreement.

     8.   Waiver of Defenses
          ------------------

     In the event that NMC Homecare's guilty plea is not accepted by the Court
for whatever reason, or is later withdrawn for whatever reason, NMC Homecare
waives, and agrees not to interpose, any defense it would have under the Speedy
Trial Act or any applicable statute os limitations, by virtue of the passage of
time subsequent to the date of this letter, as to any criminal charges relating
to matters within the scope of the grand jury investigation conducted by the
U.S. Attorney, provided such charges are filed within 90 days of the date on
which such guilty plea is rejected or withdrawn.  In addition, NMC Homecare
agrees to be bound by the waiver of the statute of limitations contained in the
January 10, 2000 letter from Breckinridge L. Willcox to Peter A. Mullin, and
that such waiver shall remain in full force and effect following execution of
this Agreement.  Notwithstanding paragraph 6 above, this waiver of the defenses
shall remain in full force and effect even if Defendant's plea of guilty is not
accepted by the court, or is withdrawn for any reason.

     9.   Breach of Agreement
          -------------------

     If the United States determines that Defendant has failed to comply with
any provision of this Plea Agreement, or has committed any crime between the
date of this letter and the date of sentencing in this matter, the United States
may, at its sole option, be released from its commitments under this Plea
Agreement in their entirety by notifying Defendant, through counsel or
otherwise, in writing.  The United States may also pursue all remedies available
to it under the law, irrespective of whether it elects to be released from its
commitments under this Plea Agreement.  Defendant recognizes that no such breach
by it of any obligation under this Plea Agreement shall give rise to grounds for
withdrawal of its guilty plea.  Defendant understands that should it breach any
provision of this Plea Agreement, the United States will have the right to use
against Defendant before any grand jury, at any trial, hearing or for sentencing
purposes, any statements made by its employees and agents, and any information,
materials, documents or objects provided by Defendant to the government pursuant
to this Plea Agreement without any limitation.

     10.  Corporate Authorization
          -----------------------

     NMC Homecare shall provide to the United States and the Court a certified
copy of a resolution of the Board of Directors of Defendant, affirming that the
Board of Directors has authority to enter into this Plea Agreement and has (1)
reviewed the Information in this case and this Plea Agreement; (2) consulted
with legal counsel in connection with this matter; (3) voted to enter into this
Plea Agreement; (4) voted to authorized NMC Homecare to plead guilty to the
charge specified in this Plea Agreement; and (5) voted to authorize the
corporate officer identified below to execute the Plea Agreement and all other
documents necessary to carry out the provisions of the Plea Agreement.  NMC
Homecare agrees that the counsel identified below

                                       4
<PAGE>

will appear on behalf of NMC Homecare and enter the guilty plea and will also
appear for the imposition of sentence.

     11.  Who Is Bound By Agreement
          -------------------------

     This Plea Agreement binds NMC Homecare and the United States Department of
Justice, including each of its United States Attorney's Offices, but cannot and
does not bind the Tax Division of the U.S. Department of Justice, the Internal
Revenue Service of the United States Department of the Treasury or any other
federal, state or local prosecutive authority.

     12.  Complete Agreement
          ------------------

     This letter contains the complete agreement between the parties relating to
the disposition of this case as to this Defendant.  No promises, agreements or
conditions have been entered into other than those set forth in this letter.
This Plea Agreement supersedes prior understandings, if any, of the parties,
whether written or oral, relating to the disposition of Count One of the
Information in this case.  This Plea Agreement cannot be modified other than in
a written memorandum signed by the parties or on the record in court.

     If this letter accurately reflects the agreement between the United States
and Defendant, please sign the Acknowledgment of Plea Agreement below, provide
evidence of the requisite authorization to enter into this Plea Agreement, and
return the original of this letter to Assistant U.S. Attorney Peter A. Mullin or
Joshua S. Levy.

                              Sincerely yours,

                               /s/ Mark W. Pearlstein
                              ------------------------------
                              MARK W. PEARLSTEIN
                              Acting U.S. Attorney
                              District of Massachusetts


                               /s/ John Keeney (mwp)
                              -------------------------------
                              JOHN C. KEENEY
                              Deputy Assistant Attorney General
                              Criminal Division
                              U.S. Department of Justice

                                       5
<PAGE>

                  Corporate Acknowledgment of Plea Agreement
                  ------------------------------------------

     The Directors of NMC Homecare, Inc. have read this Plea Agreement and the
attached criminal Information in their entirety, and have discussed this matter
with legal counsel of the corporation's choosing, including the undersigned
counsel. As set forth in the attached resolution, the Board of Directors has
authorized me, as-an officer of the corporation, to enter into this Plea
Agreement on behalf of the corporation. I hereby acknowledge, on behalf of NMC
Homecare, Inc., that this Plea Agreement fully sets forth the agreement between
NMC Homecare, Inc. and the United States relating to the disposition of Count
One of the Information in this case and that no additional promises or
representations have been made to the corporation, by any official of the United
States, relating to the disposition o' that count. NMC Homecare, Inc. is
entering into this Plea Agreement freely, voluntarily and knowingly because it
is guilty of the offense set forth in Count One of the Information and it
believes this Plea Agreement is in its best interest.


Dated:  1/18/00               /s/ Ben J. Lipps
                              ---------------------------------
                              BEN J. LIPPS
                              President
                              NMC Homecare, Inc.


Dated:  January 18, 2000       /s/ Jonathan Chiel
                              --------------------------------
                              Jonathan Chiel
                              Choate, Hall & Stewart


Dated:  1/18/00                /s/ Alan E. Reider
                              --------------------------------
                              Alan E. Reider
                              Arent, Fox, Kintner, Plotkin & Kahn


Dated:  1/18/00                /s/ Breckinridge L. Wilox
                              -------------------------------
                              Breckinridge L. Willcox
                              Arent, Fox, Kintner, Plotkin & Kahn


Dated:  January 18, 2000       /s/ Jeffrey Stone
                              ---------------------------------
                              Jeffrey E. Stone
                              McDermott, Will & Emery


Dated:  1/18/2000              /s/ Harold Damelin
                              ---------------------------------
                              Harold Damelin
                              Powers, Pyles, Sutter & Verville

                              Attorneys for NMC Homecare, Inc.

                                       6
<PAGE>

                                   EXHIBIT A
                                 (Information)

The Information dated January 19, 2000 is incorporated by reference to Exhibit A
of Exhibit 10.6 to this Current Report on Form 8-K.



<PAGE>

                                                                    EXHIBIT 10.9


                                            U.S. Department of Justice


                                            United States Attorney
                                            District of Massachusetts


Main Reception: (617) 748-3100              United States Courthouse, Suite 9200
                                            1 Courthouse Way
                                            Boston, Massachusetts 02210


                                        January 17, 2000

By Hand
- -------

Jonathan Chiel, Esq.                    Jeffrey E. Stone, Esq.
Choate, Hall & Stewart                  McDermott, Will & Emery
Exchange Place                          222 West Monroe Street
53 State Street                         Chicago, IL 60606-5096
Boston, MA 02109-2891

Alan E. Reider, Esq.                    Harold Damelin, Esq.
Breckinridge L. Willcox, Esq.           Powers, Pyles, Sutter &
Arent, Fox, Kintner, Plotkin              Verville
 & Kahn                                 12/th/ Floor
1050 Connecticut Avenue, NW             1875 Eye Street, NW
Washington, D.C. 20036                  Washington, D.C. 20006-5409


          Re:  Fresenius Medical Care Holdings, Inc.
               -------------------------------------

Gentlemen:

     This letter sets forth the Agreement between the United States Department
of Justice and the United States Attorney for the District of Massachusetts
(hereinafter collectively "United States") and your client, Fresenius Medical
Care Holdings, Inc., ("FMCH"), a New York corporation, as follows:

     1.   No Criminal Prosecution of FMCH
          -------------------------------

     Except as set forth below, the United States hereby declines criminal
prosecution of FMCH, its wholly owned subsidiary, National Medical Care, Inc.
(NMC), and their parent,

                                       1
<PAGE>

subsidiary and affiliated corporate entities, except NMC Homecare, Inc. ("NMC
Homecare"), LifeChem, Inc. ("LifeChem") and NMC Medical Products, Inc. ("MPD"),
for the following conduct: (1) conduct described in the Information attached
hereto as Exhibit A; (2) conduct within the scope of the grand jury
investigation conducted by the United States Attorney for the District of
Massachusetts; and (3) conduct otherwise known to the United States Attorney for
the District of Massachusetts as of the date of this letter.

     Certain allegations regarding Spectra Laboratories, Inc. were recently
brought to the attention of the U.S. Attorney for the Northern District of
California ("USA-NDCA"). Based upon a preliminary review of those allegations,
the USA-NDCA has no present intention to open a criminal investigation into
those allegations. However, facts may come to the attention of the USA-NDCA that
might lead to a criminal investigation. As a result, the USA-NDCA does not
decline prosecution of Spectra Laboratories, Inc., SRC Holding Company, Inc., or
any other entity responsible for their conduct.

     This agreement is not intended to and does not affect the criminal
liability of any individual.

     This declination of criminal prosecution is contingent on (1) the guilty
pleas of NMC Homecare, LifeChem, and MPD, as set forth in the Plea Agreements
which are being signed contemporaneous with this Agreement, being accepted by
the Court, and not withdrawn, and (2) FMCH, NMC and their related entities
performing all of their obligations as set forth in this Agreement and the four
civil settlement agreements (NMC Homecare, LifeChem, credit balances and Doppler
Flow Test/BIA tests) being signed contemporaneous with this Agreement. If such
guilty pleas are not accepted by the court or are withdrawn for any reason, or
if FMCH, or a related entity, should fail to perform an obligation under one of
the civil settlement agreements, this declination of criminal prosecution shall
be null and void.

     2.   Corporate Integrity Agreement
          -----------------------------

     Contemporaneous with the execution of this agreement, FMCH shall enter into
a Corporate Integrity Agreement with the Office of Inspector General ("Inspector
General") for the United States Department of Health and Human Services.

     3.   FMCH Guarantee
          --------------

                                       2
<PAGE>

     FMCH hereby acknowledges that, pursuant to the Guarantee Agreement dated
July 31, 1996 among Fresenius Medical Care AG, FMCH, NMC, and the United States
of America, a copy of which is attached as Exhibit B, FMCH has unconditionally
guaranteed to the United States the prompt payment when due of all obligations
of NMC to the United States in respect of the Government Claims, as defined in
the Guarantee Agreement.  FMCH expressly and unequivocally agrees that the
obligations of FMCH, NMC, NMC Homecare,  LifeChem, and MPD contained in the Plea
Agreements and Civil Settlement Agreements being signed contemporaneous with
this Agreement constitute obligations of NMC to the United States in respect of
the Government Claims within the meaning of the Guarantee Agreement.

     4.   Waiver of Defenses
          ------------------

     In the event that the guilty pleas of NMC Homecare, LifeChem, or MPD, as
contemplated by the Plea Agreements being signed contemporaneous with this
Agreement, are not accepted by the Court for whatever reason, or are later
withdrawn for whatever reason, FMCH hereby agrees for itself and on behalf of
NMC, and their parent, subsidiary and affiliated corporate entities, to waive,
and not interpose, any defense it or they would have under any statute of
limitations or the Speedy Trial Act, by virtue of the passage of time subsequent
to the execution of this Agreement, as to any criminal charges relating to the
matters within the scope of the grand jury investigation conducted by the U.S.
Attorney, if such charges are filed within 90 days of the date on which such
guilty plea is rejected or withdrawn. In addition, FMCH agrees on behalf of
itself, NMC and their subsidiary and affiliated corporations to extend and
maintain in full force and effect the waivers of the statute of limitations and
Speedy Trial Act contained in the letters of January 7, 2000 from Susan G.
Winkler to Jonathan Chiel, Esq. and January 10, 2000 from Breckinridge L.
Willcox, Esq., et al. to Peter A. Mullin. FMCH agrees to take all steps
               -- --
necessary to obtain such waivers from NMC, and its subsidiary and affiliated
corporate entities, including, but not limited to, obtaining corporate
authorization to sign any necessary document.

     5.   Cooperation of FMCH
          -------------------

     FMCH agrees to cooperate completely and truthfully with the U.S. Attorney
in connection with his on-going investigation and prosecution of others for
alleged violations of federal criminal law arising out of his investigation.
FMCH understands and

                                       3
<PAGE>

agrees that such cooperation shall include, without limitation, the following,
if requested by the U.S. Attorney:

     a.   prompt production to the U.S. Attorney of any non-privileged document
or record in the possession, custody or control of FMCH, NMC or their subsidiary
and affiliated corporate entities relating to the subject matter of the
investigation;

                                       4
<PAGE>

     b.   taking all reasonable measures available to FMCH to ensure that
present and former officers, directors, agents and employees of FMCH, NMC and
their subsidiary and affiliated corporate entities cooperate truthfully and
completely with the U.S. Attorney in connection with his on-going investigation
and prosecutions; and

     c.   taking all reasonable measures available to FMCH to make all present
and former officers and employees of FMCH, NMC and their subsidiary and
affiliated corporate entities available for interviews by law enforcement
personnel, upon reasonable notice.

6.             Breach of Agreement
               -------------------

     If the United States determines that FMCH has failed to comply with any
provision of this Agreement, the United States may, at its sole option, be
released from its commitments under the Agreement in their entirety, by
notifying FMCH, through counsel or otherwise, in writing. The United States may
also pursue all remedies available to it under the law irrespective of whether
the United States elects to be released from its commitments under this
Agreement. FMCH understands that should it breach any provision of this
Agreement, the United States will have the right to use against FMCH and NMC,
before any grand jury, at any trial, hearing or for sentencing purposes, any
statements, information, materials, documents or objects provided by FMCH to the
United States pursuant to this Agreement, without limitation.

6.             Who Is Bound By Agreement
               -------------------------

     This Agreement is binding upon FMCH and the United States Department of
Justice, including each of its United States Attorney's Offices, but can not and
does not bind the Tax Division of the U.S. Department of Justice, the Internal
Revenue Service of the U.S. Department of the Treasury or any other federal,
state or local prosecutive authority.

6.             Corporate Authorization
               -----------------------

     FMCH shall provide to the U.S. Attorney a certified copy of a resolution of
its Board of Directors, affirming that the Board of Directors has authority to
enter into this Agreement and has (1) reviewed this Agreement, the attached
Information, the three Plea Agreements and four Civil Settlement Agreements
being signed contemporaneous with this Agreement and the attached

                                       5
<PAGE>

Guarantee Agreement; (2) consulted with legal counsel in connection with the
matter; (3) voted to enter into this Agreement; and (4) voted to authorize the
corporate officer identified below to execute this Agreement and all other
documents necessary to carry out the provisions of the Agreement.

     9.   Complete Agreement
          ------------------

     This letter, together with the three Plea Agreements and four Civil
Settlement Agreements being signed contemporaneous with this Agreement, and the
July 31, 1996 Guarantee Agreement, contain the complete agreement between the
parties relating to the criminal disposition of this matter. No promises,
representations, or conditions have been entered into other than those set forth
in this letter and the above-referenced documents. This Agreement supersedes
prior understandings, if any, of the parties, whether written or oral, relating
to the criminal disposition of this matter. This Agreement can be modified or
supplemented only in a written memorandum signed by the parties or on the record
in Court.

     If this letter accurately reflects the Agreement between the United States
and your client, Fresenius Medical Care Holdings, Inc., please execute this
Agreement in the spaces indicated below, provide the requisite documentation of
authorization to enter into this Agreement and return the original of this
letter to Assistant U.S. Attorney Peter A. Mullin or Susan G. Winkler.

                                        Sincerely yours,

                                        /s/ Mark W. Pearlstein
                                        --------------------------------
                                        MARK W. PEARLSTEIN
                                        Acting United States Attorney
                                        District of Massachusetts

                                        /s/ John Keeney (wwp)
                                        --------------------------------
                                        JOHN C. KEENEY
                                        Deputy Assistant Attorney General
                                        Criminal Division
                                        U.S. Department of Justice

                                       6
<PAGE>

     The Board of Directors has authorized me to execute this Agreement on
behalf of Fresenius Medical Care Holdings, Inc. The Board has read this letter,
the attached criminal Information, the three Plea Agreements and four Civil
Settlement Agreements being signed contemporaneous herewith, and the Guarantee
Agreement, in their entirety, understands them, and has discussed them fully
with FMCH's legal counsel. I hereby acknowledge, on behalf of FMCH, that this
letter fully sets forth FMCH's agreement with the United States, and that no
additional promises or representations have been made to the corporation by any
official of the United States in connection with the criminal disposition of
this matter. FMCH is entering into this Agreement freely, voluntarily and
knowingly because it believes this Agreement is in its best interest.


Dated: 1/18/00               /s/ Ben J. Lipps
                             -----------------------------
                             BEN J. LIPPS
                             President
                             Fresenius Medical Care Holdings, Inc.


Dated: January 18, 2000      /s/ Jonathan Chiel
                             -----------------------------
                             JONATHAN CHIEL
                             Choate, Hall & Stewart


Dated: 1/18/00               /s/ Alan E. Reider
                             -----------------------------
                             ALAN E. REIDER
                             Arent, Fox, Kintner, Plotkin & Kahn


Dated: 1/18/00               /s/ Breckinridge L. Willcox
                             -----------------------------
                             BRECKINRIDGE L. WILLCOX
                             Arent, Fox, Kintner, Plotkin & Kahn


Dated: January 18, 2000      /s/ Jeffrey E. Stone
                             --------------------------------
                             JEFFREY E. STONE
                             McDermott, Will & Emery


Dated: 1/18/00               /s/ Harold Damelin
                             --------------------------------
                             HAROLD DAMELIN
                             Powers, Pyles, Sutter & Verville

                             Attorneys for Fresenius Medical Care
                             Holdings, Inc.

                                       7
<PAGE>

                                   EXHIBIT A
                                 (Information)

The Information dated January 19, 2000 is incorporated by reference to Exhibit A
of Exhibit 10.6 to this Current Report on Form 8-K.





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