EXHIBIT 2.3

                   AMENDMENT NO. 1 TO AGREEMENT AND PLAN OF MERGER


           AMENDMENT NO. 1, dated as of October 19, 1997 (this "AGREEMENT"), 
to that certain Agreement and Plan of Merger (the "MERGER AGREEMENT"), dated 
as of May 8, 1997, by and among Foundation Health Systems, Inc., a Delaware 
corporation ("PARENT"), PHS Acquisition Corp., a Delaware corporation and a 
wholly owned subsidiary of Parent ("MERGER SUB"), and Physicians Health 
Services, Inc., a Delaware corporation (the "COMPANY"). All capitalized terms 
used herein and not otherwise defined shall have the meanings ascribed 
thereto in the Merger Agreement.

           Notwithstanding anything to the contrary contained in the Merger 
Agreement, Parent, Merger Sub and the Company hereby acknowledge and agree as 
follows:

           1.  The first sentence of Section 1.2 of the Merger Agreement is 
hereby amended by deleting such sentence in its entirety and substituting 
therefor the following sentence:

     "Subject to the provisions of this Agreement, the Merger shall be 
     consummated as promptly as practicable (and in any event within two 
     business days) after satisfaction or, to the extent permitted hereunder, 
     waiver of all of the conditions to each party's obligation to consummate 
     the Merger contained in Article VI (the "FIRST AVAILABLE EFFECTIVE 
     DATE"), by duly filing an appropriate certificate of merger (the 
     "CERTIFICATE OF MERGER"), in such form as is required by, and executed 
     in accordance with, the relevant provisions of Delaware Law; PROVIDED, 
     that in the event that the First Available Effective Date occurs prior 
     to January 6, 1998, then at the request of Parent upon notice provided 
     pursuant to Section 8.4 hereof, the Effective Date shall occur on a 
     business day thereafter selected by Parent no later than January 6, 
     1998; PROVIDED, FURTHER, that in the event, pursuant to the request of 
     Parent, the Effective Time (as defined below) does not occur on the 
     First Available Effective Date, Section 3.8 of the Merger Agreement 
     shall not be deemed to be breached as a result of any event occurring or 
     arising after the First Available Effective Date."

           2.  Section 1.8(a) of the Merger Agreement is hereby amended by 
deleting such subsection in its entirety and substituting therefor the 
following subsection:

           "(a)  Each Share issued and outstanding immediately prior to the 
     Effective Time (other than Shares to be cancelled pursuant to Section



     1.8(b) and Dissenting Shares (as defined in Section 2.1)) shall be 
     cancelled and extinguished and converted into the right to receive 
     $28.25 in cash, without interest thereon (the "MERGER CONSIDERATION"), 
     subject to Section 1.10."

           3.  Article I of the Merger Agreement is hereby amended by 
inserting therein a new Section 1.10 as follows:

           "1.10 ADJUSTMENT OF MERGER CONSIDERATION. Notwithstanding anything 
     to the contrary set forth in Section 1.8(a) hereof, in the event that, 
     at or prior to the Effective Time, the Company obtains each of the 
     waivers and amendments described on Schedule 6.1 (in a form or forms 
     reasonably satisfactory to Parent), then the Merger Consideration shall 
     be increased by an amount equal to $1.00 to a total of $29.25."

           4.  Section 6.1(b) of the Merger Agreement is hereby amended by 
deleting such subsection in its entirety and substituting therefor the 
following subsection:

           "(b) Intentionally Omitted."

           5.  Section 7.1(b) of the Merger Agreement is hereby amended by 
(i) deleting each reference to the date "December 31, 1997" and substituting 
therefor the date "March 31, 1998" and (ii) deleting the language in clause 
(i) following the first appearance of the phrase "set forth in Section 1.4."

           6.  Except as provided for in this Agreement, the Merger Agreement 
shall remain in full force and effect in accordance with its terms.

           7.  This Agreement will be effective immediately and only after 
obtaining the prior written consent of Greater Bridgeport Individual Practice 
Association, Inc. (the "STOCKHOLDER") pursuant to the terms of that certain 
Voting Trust Agreement, dated as of May 8, 1997 (the "VOTING TRUST AGREEMENT"), 
by and among the Stockholder, the Company and the Voting Trustee (as defined in 
the Voting Trust Agreement).

                                       2


           IN WITNESS WHEREOF, the parties hereto have caused this Agreement 
to be executed by their respective duly authorized officers as of the date 
first above written.

                                            PHYSICIANS HEALTH SERVICES, INC.



                                            By: /s/ James C. Elrod, Jr.
                                               --------------------------------
                                            Name:  James C. Elrod, Jr.
                                            Title: Executive Vice President


                                            FOUNDATION HEALTH SYSTEMS, INC.


                                            By: /s/ Jay M. Gellert
                                               --------------------------------
                                            Name:  Jay M. Gellert
                                            Title: President and Chief Operating
                                                   Officer

                                            PHS ACQUISITION CORP.



                                            By: /s/ B. Curtis Westen
                                               --------------------------------
                                            Name:  B. Curtis Westen
                                            Title: Vice President and Secretary

The undersigned hereby confirms its prior consent to the
foregoing Amendment No. 1 in accordance with Section
7(b) of the Voting Trust Agreement, dated as of May 8,
1997, by and among the undersigned, the Company and
American Stock Transfer & Trust Company, as Voting
Trustee.


Dated: October  , 1997

GREATER BRIDGEPORT INDIVIDUAL PRACTICE
    ASSOCIATION, INC.


By: /s/ Nancy S. Watters
   -----------------------------------------
Name:  Nancy S. Watters
Title: President and Chief Executive Officer