SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                 SCHEDULE 13G


                                 (Rule 13d-102)


             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2


                   Under the Securities Exchange Act of 1934
                          (Amendment No.      )

                         Total Renal Care Holdings Inc.
             -----------------------------------------------------
                                (Name of Issuer)
                                
                                  Common Stock
              -----------------------------------------------------
                         (Title of Class of Securities)

                                    89151A107
             -----------------------------------------------------
                                 (CUSIP Number)



Check the following box if a fee is  being paid with this statement [x].


- ----------
*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


<PAGE>

CUSIP No.89151A107                    13G                    Page 2  of 6  Pages



- --------------------------------------------------------------------------------
   1.  NAME OF REPORTING PERSON(S)
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)

          Morgan  Stanley,  Dean  Witter,  Discover  &  Co.
          IRS  #  39-314-5972
  
       

- --------------------------------------------------------------------------------
   2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3.  SEC USE ONLY




- --------------------------------------------------------------------------------
   4.  CITIZENSHIP OR PLACE OF ORGANIZATION

          The state of organization is Delaware.


- --------------------------------------------------------------------------------
   NUMBER OF      5.   SOLE VOTING POWER
     SHARES              0 
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6.   SHARED VOTING POWER
      EACH               2,296,691
   REPORTING      --------------------------------------------------------------
     PERSON       7.   SOLE DISPOSITIVE POWER
      WITH               0
                  --------------------------------------------------------------
                  8.   SHARED DISPOSITIVE POWER
                         2,325,456             

- --------------------------------------------------------------------------------
   9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     
          2,325,456

- --------------------------------------------------------------------------------
  10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



- --------------------------------------------------------------------------------
  11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          5.22%

- --------------------------------------------------------------------------------
  12.  TYPE OF REPORTING PERSON*

                         IA, CO
                         
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

                                       
CUSIP No.89151A107                   13G                   Page 3  of  6  Pages





Item 1.     (a)   Name of Issuer:
                  Total Renal Care Holdings Inc.  
                  --------------------------------------------------------------
            (b)   Address of Issuer's Principal Executive Offices:
                  21250 Hawthorne Boulevard Suite 800
                  Torrance, CA 9050-5517
                  --------------------------------------------------------------
Item 2.     (a)   Name of Person Filing:
                  Morgan Stanley, Dean Witter, Discover & Co.
                  
                  --------------------------------------------------------------
            (b)   Address of Principal Business Office, or if None, Residence:
                  1585 Broadway
                  New  York, New  York  10036

                  --------------------------------------------------------------
            (c)   Citizenship:
                           Incorporated  by  reference  to  Item  4  of  the
                           cover page  pertaining  to  each  reporting  person.

                               -------------------------------------------------
            (d)   Title of Class of Securities:
                           Common Stock
                  --------------------------------------------------------------
            (e)   CUSIP Number:
                           89151A107
                               -------------------------------------------------

Item 3.           Morgan Stanley, Dean Witter, Discover & Co. is (e) an 
                  Investment Adviser registered under Section 203 of the  
                  Investment Advisers Act of 1940.



<PAGE>
                                      
CUSIP No.89151A107                   13-G                   Page 4  of  6  Pages



Item 4.     Ownership.

               Incorporated  by  reference  to  Items  (5) - (9) and (11) of the
               cover page.

Item 5.     Ownership of Five Percent or Less of a Class.
               Inapplicable   
            
Item 6.     Ownership of More Than Five Percent on Behalf of Another Person.

               Accounts managed on a discretionary basis by Morgan Stanley, Dean
               Witter,  Discover & Co. are known to have the right to receive or
               the  power to  direct  the  receipt  of  dividends  from,  or the
               proceeds from the sale of such securities.  No such account holds
               more than 5 percent of the class.

Item 7.     Identification and Classification of the Subsidiary which Acquired
            the Security Being Reported on By the Parent Holding Company.


Item 8.     Identification and Classification of Members of the Group.


Item 9.     Notice of Dissolution of Group.


Item 10.    Certification.

               By signing  below I certify that, to the best of my knowledge and
               belief,  the  securities  referred to above were  acquired in the
               ordinary course of business and were not acquired for the purpose
               of and do not have the  effect of  changing  or  influencing  the
               control of the issuer of such securities and were not acquired in
               connection  with or as a participant  in any  transaction  having
               such purpose or effect.


<PAGE>
CUSIP No.89151A107                    13-G                   Page 5  of  6 Pages


                                  Signature.


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


Date:       February 12, 1998


Signature:  /s/ Bruce Bromberg
            -----------------------------------------------------------------
          
Name/Title  Bruce Bromberg / Vice President Morgan Stanley & Co. Incorporated
            -----------------------------------------------------------------
            MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.


                       INDEX TO EXHIBITS                           PAGE
                       -----------------                           ----

EXHIBIT 1       Secretary's Certificate Authorizing Bruce Bromberg    6
                to Sign on behalf of Morgan Stanley, Dean Witter,
                Discover and Co.                  


* Attention. Intentional misstatements or omissions of fact constitute federal
  criminal violations (see 18 U.S.C. 1001).

(022597DTI)





<PAGE>



                                                             Page 6  of 6  Pages
                                  EXHIBIT 1                   ------------------

                 MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.
                                      
                           SECRETARY'S CERTIFICATE
                                      



        I, Charlene R. Herzer, a duly elected and acting Assistant Secretary of
Morgan Stanley, Dean Witter, Discover & Co., a corporation organized and
existing under the laws of the State of Delaware (the "Corporation"), certify
that as approved by a Unanimous Consent of Directors in Lieu of a Meeting dated
as of May 31, 1997, the following persons are each authorized to sign reports
to be filed under Sections 13 and 16 of the Securities Exchange Act of 1934 on
behalf of the Corporation, and such authorizations are in full force and
effect as of this date:

                             Stuart J.M. Breslow
                             Robert G. Koppenol
                             Bruce Bromberg
                             Robin Sherak

        IN WITNESS WHEREOF, I have hereunto set my name and affixed the seal of
the Corporation as of the 3rd day of June, 1997.


                                          /s/ Charlene R. Herzer
                                         ------------------------
                                             Charlene R. Herzer
                                             Assistant Secretaty