EXHIBIT 10.5

                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

AMENDMENT NO. 4 AND WAIVER (this "Amendment"), dated as of November 8, 1999, to
and under the Amended and Restated Revolving Credit Agreement, as amended by
Amendment No. 1 and Consent No. 1, dated as of August 5, 1998, Amendment No. 2,
dated as of November 12, 1998, and Amendment No. 3 and Waiver, dated as of
August 9, 1999 (the "Third Amendment and Waiver") (as so amended, the
"Revolving Credit Agreement"), dated as of April 30, 1998, by and among TOTAL
RENAL CARE HOLDINGS, INC., a Delaware corporation (the "Borrower"), the lenders
party thereto (the "Lenders"), DLJ CAPITAL FUNDING, INC., as Syndication Agent,
FIRST UNION NATIONAL BANK, as Documentation Agent, and THE BANK OF NEW YORK, as
administrative agent (in such capacity, the "Administrative Agent").

                                    RECITALS

I. Capitalized terms used herein which are not otherwise defined herein shall
have the respective meanings ascribed thereto in the Revolving Credit
Agreement.

II. The Borrower has requested that the Administrative Agent and the Lenders
agree to amend and waive certain provisions under the Revolving Credit
Agreement upon the terms and conditions contained herein, and the
Administrative Agent and the Required Lenders are willing to so agree.

Accordingly, in consideration of the Recitals and the covenants and conditions
hereinafter set forth, and for other good and valuable consideration, the
receipt and adequacy of which are hereby acknowledged, the parties hereto
hereby agree as follows:

  1. The Administrative Agent and the Required Lenders hereby waive
  compliance with Section 7.15 of the Revolving Credit Agreement from and
  including September 30, 1999 through and including March 15, 2000 (the
  "Waiver Period"), provided that each of the following conditions (the
  "Waiver Conditions") shall be, and shall at all times remain, satisfied:

    (a) the Leverage Ratio (calculated so as to exclude, to the extent
    included therein, certain one-time charges related to the fiscal
    quarter of the Borrower ended on September 30, 1999 (consisting of
    approximately: $10,000,000 relating to the write-off of certain
    accounts receivable at the Borrower's Minnesota laboratory, $3,200,000
    relating to certain fees and expenses paid in connection with the
    August 9, 1999 amendments and waivers to the Revolving Credit Agreement
    and the Term Loan Facility, $2,580,000 relating to certain severance
    charges; $730,000 relating to certain aircraft, $540,000 relating to
    the settlement of a certain workers compensation claim in respect of
    RTC, and $130,000 relating to certain employment retention bonuses) in
    an aggregate amount not to exceed $17,200,000 on a pre-tax basis (the
    "One-Time Charges")) during the Waiver Period shall not exceed
    4.80:1.00 at any time,

    (b) the Aggregate Credit Exposure of all Lenders during the Waiver
    Period shall not exceed $650,000,000 at any time,

    (c) in addition to the terms, conditions and restrictions contained in
    the Revolving Credit Agreement, the use by the Borrower and any of its
    Subsidiaries of cash (including, without limitation, the proceeds of
    all Loans) during the period from July 1, 1999 through and including
    March 15, 2000 shall be solely for: (i) the ordinary working capital
    purposes of the Borrower and its Subsidiaries, (ii) Permitted
    Acquisitions, and (iii) other capital expenditures and corporate
    purposes of the Borrower and its Subsidiaries in amounts that do not
    materially exceed those outlined in the cash flow forecast of the
    Borrower distributed to the Lenders on October 27, 1999,



    (d) in addition to the terms, conditions and restrictions contained in
    the Revolving Credit Agreement, the total consideration for (i) all
    Permitted Acquisitions made after July 1, 1999 through and including
    March 15, 2000 (excluding the Permitted Acquisitions set forth in Annex
    I attached hereto) shall not exceed in the aggregate $10,000,000, and
    (ii) all Foreign Acquisitions made after July 1, 1999 through and
    including March 15, 2000 shall not exceed in the aggregate $5,000,000,

    (e) for purposes of determining the Commitment Fee during the Waiver
    Period, the Leverage Ratio shall be calculated without excluding the
    One-Time Charges as defined in the Third Amendment and Waiver (prior to
    giving effect to this Amendment) and as defined in this Amendment, and

    (f) during the period from July 1, 1999 through and including March 15,
    2000 capital expenditures of the Borrower and its Subsidiaries (on a
    Consolidated basis determined in accordance with GAAP) attributable to
    the creation of new renal treatment centers or the relocation or
    expansion of existing renal treatment centers shall not exceed in the
    aggregate $40,000,000.

  2. Provided that each of the Waiver Conditions shall be, and shall at all
  times remain, satisfied, the Administrative Agent and the Required Lenders
  hereby waive any Default or Event of Default that may have occurred prior
  to the effectiveness of this Amendment (a) under or in connection with
  Section 4.21 or 7.2(a), (b) due to any misrepresentation or
  miscertification made in (i) any Borrowing Request, Notice of
  Conversion/Continuation or Letter of Credit Request delivered to the
  Administrative Agent during the period from and including September 30,
  1999 to but excluding the effective date of this Amendment, or (c) under or
  in connection with Section 9.1(g)(iii) or 9.1(k)(ii) as a result of any
  defaults that may have arisen under the Term Loan Facility that will be
  waived pursuant to the Term Loan Waiver (as defined below).

  3. Effective at all times on and after September 30, 1999, clause (a) of
  the definition of "Applicable Margin" contained in Section 1.1 of the
  Revolving Credit Agreement is hereby amended and restated as follows:

    (a) (i) for the period from and including September 30, 1999 through
    and including March 15, 2000, (A) with respect to the unpaid principal
    amount of Eurodollar Advances and Alternate Currency Advances, 3.50%,
    and (B) with respect to the unpaid principal amount of ABR Advances,
    2.25%, and (ii) thereafter, at all times during the applicable periods
    set forth below and based on the most recently delivered Compliance
    Certificate of the Borrower: (A) with respect to the unpaid principal
    amount of Eurodollar Advances and Alternate Currency Advances, the
    percentage set forth below under the heading "Eurodollar Margin" and
    adjacent to such period, and (B) with respect to the unpaid principal
    amount of ABR Advances, the percentage set forth below under the
    heading "ABR Margin" and adjacent to such period:



                                                             Eurodollar  ABR
                             Period                            Margin   Margin
                             ------                          ---------- ------
                                                                  
     When the Leverage Ratio is greater than 4.40:1.00......    3.50%    2.25%
     When the Leverage Ratio is less than or equal to
      4.40:1.00 but greater than 4.00.......................    3.25%    2.00%
     When the Leverage Ratio is less than or equal to
      4.00:1.00.............................................    3.00%    1.75%


  4. Simultaneously with the delivery to the Administrative Agent of the
  Compliance Certificate for the fiscal quarter of the Borrower ended on
  September 30, 1999 and in no event later than November 15, 1999 (the "CC
  Delivery Date"), the Borrower shall pay to the Administrative Agent, for
  distribution to the Lenders, any additional interest, Commitment Fees and
  Letter of Credit Fees that accrued under the Revolving Credit Agreement and
  the Revolving Credit Notes during the period from and including September
  30, 1999 to and including the CC Delivery Date, as a result of any increase
  in the Applicable Margin or Commitment Fee caused by the amendment to the
  definition of "Applicable Margin" effected

                                       2


  hereby, to the extent that any such accrued additional interest, Commitment
  Fees or Letter of Credit Fees would have been payable on any Interest
  Payment Date or other applicable payment date during such period. All such
  additional interest, Commitment Fees and Letter of Credit Fees that have
  accrued under the Revolving Credit Agreement and the Revolving Credit Notes
  on and after September 30, 1999 but that have not been paid on or before
  the CC Delivery Date, shall continue to be owed under the Revolving Credit
  Agreement and the Revolving Credit Notes, and shall be paid in accordance
  with the Revolving Credit Agreement on the next applicable Interest Payment
  Date or other applicable payment date. Section 3.1(a) of the Revolving
  Credit Agreement and the definition of "Applicable Margin" in Section 1.1
  of the Revolving Credit Agreement, each as in effect immediately prior to
  September 30, 1999, shall continue to govern the calculation of interest,
  Commitment Fees and Letter of Credit Fees payable thereunder for periods
  prior to such date.

  5. The Administrative Agent and the Required Lenders hereby consent to the
  Term Loan Waiver.

  6. The Aggregate Revolving Credit Commitments are hereby permanently
  reduced to $700,000,000 and Exhibit A to the Credit Agreement is hereby
  amended and restated in the form of Exhibit A attached hereto.

  7. Paragraphs 1--6 of this Amendment shall not become effective until the
  satisfaction of all of the following conditions precedent:

    (a) The Administrative Agent shall have received this Amendment, duly
    executed by a duly authorized officer or officers of the Borrower, the
    Guarantors, the Pledgors, the Administrative Agent and the Required
    Lenders.

    (b) Receipt by the Administrative Agent, for the account of each Lender
    that shall have executed and delivered this Amendment (without any
    reservation or condition) to the Administrative Agent before 5:00 p.m.
    (New York City time) on November 8, 1999, of a non-refundable fee in an
    amount equal to 0.250% of the Revolving Credit Commitment (as set forth
    on Exhibit A attached hereto) of such Lender.

    (c) The Limited Waiver and Third Amendment to Amended and Restated Term
    Loan Agreement, dated as of the date hereof and substantially in the
    form of Annex II hereto (the "Term Loan Waiver"), shall have become
    effective prior to or simultaneously herewith, and the Administrative
    Agent shall have received an executed copy thereof.

    (d) The Administrative Agent shall have received a certificate, dated
    the effective date of this Amendment, of the Secretary or Assistant
    Secretary of the Borrower (i) attaching a true and complete copy of the
    resolutions of its Board of Directors and of all documents evidencing
    other necessary corporate action (in form and substance satisfactory to
    the Administrative Agent) taken by it to authorize this Amendment and
    the transactions contemplated hereby, and (ii) setting forth the
    incumbency of its officer or officers (including therein the signature
    specimen of such officer or officers) who may sign this Amendment, any
    Loan Document or any other document, notice or certificate executed and
    delivered in connection with any Loan Document.

    (e) The Administrative Agent shall have received an opinion of general
    counsel of the Borrower, the Guarantors and the Pledgors, dated the
    effective date of this Amendment and addressed to the Administrative
    Agent, the Collateral Agent, the Documentation Agent, the Syndication
    Agent and the Lenders, in form and substance reasonably satisfactory to
    the Administrative Agent and the Syndication Agent.

  8. Without limiting the generality of the provisions of Section 11.1 of the
  Revolving Credit Agreement, the waivers set forth in this Amendment shall
  be limited precisely as written and nothing in this Amendment shall be
  deemed to: (a) constitute a waiver of any Defaults or Events of Default
  arising in any other instance or a waiver of any other term, provision or
  condition of the Revolving Credit

                                       3


  Agreement or any other instrument or agreement referred to therein; or (b)
  prejudice any right or remedy that the Administrative Agent, the Collateral
  Agent, the Swing Line Lender, the Letter of Credit Issuer or any Lender may
  now have (except to the extent such right or remedy was based upon any
  existing defaults that will not exist after giving effect to this
  Amendment) or may have in the future under or in connection with the
  Revolving Credit Agreement or any other instrument or agreement referred to
  therein.

  9. The Borrower hereby acknowledges and agrees that all costs, fees and
  expenses as described in Section 11.5 of the Revolving Credit Agreement
  incurred by the Administrative Agent, the Syndication Agent, the Co-
  Arrangers, and Special Counsel with respect to this Amendment and the
  documents and transactions contemplated hereby shall be for the account of
  the Borrower and shall be promptly paid by the Borrower following the
  submission of an invoice therefor.

  10. On the date hereof, each Credit Party hereby (a) reaffirms and admits
  the validity and enforceability of the Loan Documents (as amended by this
  Amendment) and all of its obligations thereunder, (b) agrees and admits
  that it has no defenses to or offsets against any such obligation, and
  (c) represents and warrants that, after giving effect to the effectiveness
  of this Amendment, no Default or Event of Default has occurred and is
  continuing, and that each of the representations and warranties made by it
  in the Loan Documents (as amended by this Amendment) to which it is a party
  is true and correct with the same effect as though such representation and
  warranty had been made on the date hereof.

  11. In all other respects, the Loan Documents shall remain in full force
  and effect, and no amendment in respect of any term or condition of any
  Loan Document contained herein shall be deemed to be an amendment in
  respect of any other term or condition contained in any Loan Document.
  Notwithstanding anything to the contrary contained herein, the terms,
  provisions and conditions of the Third Amendment and Waiver shall remain
  and continue in full force and effect; provided that, for the period from
  September 30, 1999 through and including March 15, 2000, the Waiver
  Conditions as defined in the Third Amendment and Waiver shall be deemed
  replaced in their entirety by the Waiver Conditions as defined in this
  Amendment, except that the references to "One-Time Charges" contained in
  Paragraphs 3 and 10 of the Third Amendment and Waiver shall continue to be
  as defined under the Third Amendment and Waiver prior to giving effect to
  this Amendment.

  12. This Amendment may be executed in any number of counterparts all of
  which, taken together, shall constitute one Amendment. In making proof of
  this Amendment, it shall only be necessary to produce the counterpart
  executed and delivered by the party to be charged.

  13. THIS AMENDMENT IS BEING EXECUTED AND DELIVERED IN, AND IS INTENDED TO
  BE PERFORMED IN, THE STATE OF NEW YORK AND SHALL BE CONSTRUED AND
  ENFORCEABLE IN ACCORDANCE WITH, AND BE GOVERNED BY, THE INTERNAL LAWS OF
  THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS.

                  [Remainder of page intentionally left blank]

                                       4


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

AS EVIDENCE of the agreement by the parties hereto to the terms and conditions
herein contained, each such party has caused this Amendment to be executed on
its behalf.

                                          TOTAL RENAL CARE HOLDINGS, INC.

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       5


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE BANK OF NEW YORK,
                                          Individually, as the Letter of
                                           Credit Issuer, as the Swing Line
                                           Lender and as Administrative Agent

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       6


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          DLJ CAPITAL FUNDING, INC.,
                                          Individually and as Syndication
                                           Agent

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       7


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          FIRST UNION NATIONAL BANK,
                                          Individually and as Documentation
                                           Agent

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       8


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          ABN AMRO BANK N.V.

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       9


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          ALLIED IRISH BANKS, P.L.C., CAYMAN
                                           ISLANDS BRANCH

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       10


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          BANCO ESPIRITO SANTO E COMERCIAL DE
                                           LISBOA, NASSAU BRANCH

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       11


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          BANK LEUMI TRUST COMPANY OF NEW YORK

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       12


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE BANK OF NOVA SCOTIA

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       13


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          BANQUE NATIONALE DE PARIS

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       14


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          BHF (USA) CAPITAL CORPORATION

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       15


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          CITY NATIONAL BANK

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       16


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          BANK OF AUSTRIA CREDITANSTALT
                                           CORPORATE FINANCE, INC.

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       17


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          CREDIT LYONNAIS NEW YORK BRANCH

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       18


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          DEUTSCHE BANK AG, NEW YORK AND/OR
                                           CAYMAN ISLANDS BRANCHES

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       19


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          DRESDNER BANK AG, NEW YORK BRANCH
                                           AND GRAND CAYMAN BRANCH

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       20


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          ERSTE BANK DER OESTERREICHISCHEN
                                           SPARKASSEN AG--NEW YORK

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       21


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          FLEET NATIONAL BANK

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       22


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE FUJI BANK, LIMITED

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       23


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          HIBERNIA NATIONAL BANK

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       24


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE INDUSTRIAL BANK OF JAPAN, LTD.,
                                           LOS ANGELES AGENCY

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       25


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          KBC BANK

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       26


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          GENERAL ELECTRIC CAPITAL CORPORATION

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       27


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          MELLON BANK, N.A.

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       28


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          MICHIGAN NATIONAL BANK

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       29


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE MITSUBISHI TRUST AND BANKING
                                           CORPORATION

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       30


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          NATIONAL CITY BANK OF KENTUCKY

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       31


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          PARIBAS

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       32


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          COOPERATIEVE CENTRALE RAIFFEISEN--
                                           BOERENLEENBANK B.A, "RABOBANK
                                           NEDERLAND", NEW YORK BRANCH

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                       33


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          ROYAL BANK OF CANADA

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       34


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE ROYAL BANK OF SCOTLAND PLC

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       35


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          ROYALTON COMPANY

                                          By: Pacific Investment Management
                                           company,
                                             as its Investment Advisor

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       36


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE SANWA BANK, LIMITED

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       37


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          SOCIETE GENERALE

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       38


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          STB DELAWARE FUNDING TRUST I

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       39


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          SUNTRUST BANK, NASHVILLE, N.A.

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       40


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE TOKAI BANK, LIMITED

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       41


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          THE TOYO TRUST & BANKING CO., LTD.,
                                           New York Branch

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       42


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          UNION BANK OF CALIFORNIA, N.A.

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       43


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                          U.S. BANK NATIONAL ASSOCIATION

                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                       44


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

AGREED AND CONSENTED TO:

TOTAL RENAL CARE, INC.
TOTAL RENAL CARE ACQUISITION CORP.
RENAL TREATMENT CENTERS, INC.
RENAL TREATMENT CENTERS-MID-ATLANTIC, INC.
RENAL TREATMENT CENTERS-NORTHEAST, INC.
RENAL TREATMENT CENTERS-CALIFORNIA, INC.
RENAL TREATMENT CENTERS-WEST, INC.
RENAL TREATMENT CENTERS-SOUTHEAST, INC.

Each by: _______________________________
Name: __________________________________
Title: _________________________________

TRC WEST, INC.

By: ____________________________________
Name: __________________________________
Title: _________________________________

                                       45


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                    ANNEX I

                LIST OF PERMITTED ACQUISITIONS--PUT OBLIGATIONS

                                       46


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                    ANNEX II

                            FORM OF TERM LOAN WAIVER

                                       47


                           AMENDMENT NO. 4 AND WAIVER
                                  TO AND UNDER
                AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

                                 TRCH EXHIBIT A

                              LIST OF COMMITMENTS

                                       48