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                                                                   EXHIBIT 10.24

                                 FIRST AMENDMENT
                                     TO THE
                         PACIFICARE HEALTH SYSTEMS, INC.
                              AMENDED AND RESTATED
                           STATUTORY RESTORATION PLAN

        This First Amendment, dated as of November 1, 2000 (the "Amendment"), to
the PacifiCare Health Systems, Inc. Amended and Restated Statutory Plan ("Plan")
hereby amends the Plan as follows:

        1. Amendment to Section 3.1 (a). Section 3.1(a) is hereby amended and
restated in its entirety to read as follows:

        a. At the time of making the deferral elections described in Section
2.2, the Participant shall designate, on a form provided by the Committee, the
types of funds the Participant's Accounts will be deemed to be invested in for
purposes of determining the amount of Earnings to be credited to his or her
Account. Examples of the types of funds that may be available for investment
are: (i) Money Market Fund; (ii) Common Stock Fund; (iii) International Equity
Fund; (iv) Balanced Fund; (v) Growth Fund; (vi) Aggressive Growth Fund; (vii)
Bond Fund; and (viii) Global Equity Fund.

        In making the designation pursuant to this Section 3.1, a Participant
may specify that all or any multiple of a Participant's Account (at least 10
percent) be deemed to be invested in one or more funds. Weekly, a Participant
may change the designation made under this Section 3.1 with respect to amounts
contained in his or her Accounts or amounts to be credited to his Accounts by
current or future deferrals by filing an election, on a form provided by the
Committee, submitted no later than 12:00 a.m. Pacific Time, Wednesday of each
week. If a Participant fails to elect a type of fund under this Section 3.1, he
or she shall be deemed to have elected a fund similar to a Money Market Fund.

        2. Effectiveness of Plan. Except as expressly amended herein, the Plan
shall continue in full force and effect and is hereby ratified and confirmed in
all respects on as of the date hereof.

        3. Governing Law. This Amendment and the Plan shall be construed,
interpreted and enforced in accordance with the laws of the United States and to
the extent not preempted by such laws, by the laws of the State of California.

        4. Capitalized Terms. Capitalized terms not defined herein shall have
the meanings ascribed to them in the Plan.

        5. Section Headings. The titles of the sections hereof appear as a
matter of convenience only, do not constitute a part of this Amendment and shall
not affect the construction hereof.

        IN WITNESS WHEREOF, this Amendment to the Plan is adopted as of November
1, 2000.

                                                 PACIFICARE HEALTH SYSTEMS, INC.

                                                 -------------------------------
                                                 By:
                                                 Title:<PAGE>   1

                                                                   EXHIBIT 10.31

                         PACIFICARE HEALTH SYSTEMS, INC.
                             3120 LAKE CENTER DRIVE
                            SANTA ANA, CA 92704-6917

February 8, 2001

UniHealth Foundation
3400 Riverside Drive
Burbank, CA  91505
Attention: David R. Carpenter

RE:  MODIFICATION OF STOCK PURCHASE AGREEMENT

Ladies and Gentlemen:

This letter (the "Letter Agreement") is written to confirm our agreement
regarding the modification of the Stock Purchase Agreement dated May 4, 1999 by
and between PacifiCare Health Systems, Inc. ("PacifiCare") and UniHealth
Foundation ("UniHealth") (the "Stock Purchase Agreement"). Capitalized terms
used but not defined herein shall have the meanings given to them in the Stock
Purchase Agreement.

Under the Stock Purchase Agreement, PacifiCare agreed to purchase, and UniHealth
agreed to sell, most of the shares of PacifiCare Common Stock held by UniHealth,
subject to and in accordance with the terms of the Stock Purchase Agreement. The
parties have agreed upon certain modifications to the Stock Purchase Agreement.
The Stock Purchase Agreement is hereby modified as follows:

1.   PacifiCare agrees that, notwithstanding subsections 7.1(d) and 7.1(k) of
     the Stock Purchase Agreement, UniHealth may sell up to One Million
     (1,000,000) UniHealth Shares (the "Saleable Shares") in one or more open
     market sales or sales made pursuant to Rule 144 of the Securities Act of
     1933, as amended; provided, however, that UniHealth may not sell more than
     Two Hundred Fifty Thousand (250,000) UniHealth Shares on any given day. In
     connection with the modification to the Stock Purchase Agreement provided
     for in this paragraph 1, PacifiCare waives enforcement of any breach of the
     covenant set forth in subsection 7.1(l) of the Stock Purchase Agreement.

2.   PacifiCare waives any right of first refusal that it may have with respect
     to the Saleable Shares, provided that any such sale or disposition closes
     within thirty (30) days following February 9, 2001 and; provided, further,
     however, that UniHealth may not sell more than Two Hundred Fifty Thousand
     (250,000) UniHealth Shares on any given day. Any shares that UniHealth does
     not sell pursuant to this waiver shall remain subject to the right of first
     refusal under the Stock Purchase Agreement.

3.   In consideration for the right to sell the Saleable Shares granted in
     paragraph 1 above, UniHealth agrees that it will not exercise any right it
     may have pursuant to Section 9.2 of the Stock Purchase Agreement to sell to
     PacifiCare any of the Final Shares, and further

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     acknowledges and agrees that, upon execution of this Letter Agreement, any
     right to request that PacifiCare purchase the Final Shares will be
     terminated and extinguished in its entirety.

4.   Each of PacifiCare and UniHealth agree that, notwithstanding the definition
     of Final Closing Date set forth in Section 1.1(i) of the Stock Purchase
     Agreement, upon execution of this Letter Agreement, the Final Closing shall
     have occurred.

5.   Except as expressly stated herein, the Stock Purchase Agreement is and
     shall remain unmodified and in full force and effect.

6.   The Stock Purchase Agreement and any other agreements entered into
     contemporaneously therewith, together with this Letter Agreement, set forth
     the entire agreement of the parties and are intended to supersede all prior
     negotiations, understandings, and agreements and cannot be altered,
     amended, changed or modified in any respect or particular unless each such
     alteration, amendment, change or modification shall have been agreed to by
     PacifiCare and UniHealth and reduced to writing in its entirety and signed
     and delivered by each party.

7.   This Letter Agreement may be executed in counterparts, each of which
     together shall comprise one and the same instrument.

Please confirm your acceptance to the terms and provisions of this agreement by
signing below.

Very truly yours,

PACIFICARE HEALTH SYSTEMS, INC.

By:
    -----------------------------------
Its:
     ----------------------------------

AGREED AND ACCEPTED:

UNIHEALTH FOUNDATION

By:
    -----------------------------------
Its:                                         Date:
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                                                                   EXHIBIT 10.32

                         PACIFICARE HEALTH SYSTEMS, INC.
                             3120 Lake Center Drive
                            Santa Ana, CA 92704-6917

March 7, 2001

UniHealth Foundation
3400 Riverside Drive
Burbank, California 91505
Attention:  David R. Carpenter

RE:  MODIFICATION OF STOCK PURCHASE AGREEMENT

Ladies and Gentlemen:

This letter (the "Letter Agreement") is written to confirm our agreement
regarding the modification of the Stock Purchase Agreement, dated May 4, 1999,
by and between PacifiCare Health Systems, Inc. ("PacifiCare") and UniHealth
Foundation ("UniHealth"), as modified by that certain letter agreement, dated
February 8, 2001 (the "Stock Purchase Agreement"). Capitalized terms used but
not defined herein shall have the meanings given to them in the Stock Purchase
Agreement.

Under the Stock Purchase Agreement, PacifiCare agreed to purchase, and UniHealth
agreed to sell the shares of PacifiCare Common Stock held by UniHealth, subject
to and in accordance with the terms of the Stock Purchase Agreement. The parties
disagree as to whether the Stock Purchase Agreement including the right of first
refusal contained therein, continues in effect. If the Stock Purchase Agreement
and the right of first refusal are in effect, the right of first refusal is
waived as to those Remaining Shares (as defined below) that UniHealth sells in
accordance with this Letter Agreement.

1.      PacifiCare agrees that, notwithstanding subsections 7.1(d), 7.1(k) and
        9.2 of the Stock Purchase Agreement, UniHealth may sell its remaining
        shares of PacifiCare stock of approximately three million six hundred
        ninety-four thousand five hundred (3,694,500) shares (the "Remaining
        Shares") in one or more open market sales in accordance with the shelf
        registration statement on file with the Securities and Exchange
        Commission in accordance with the Registration Rights Agreement, dated
        May 4, 1999, between PacifiCare and UniHealth or sales made pursuant to
        Rule 144 promulgated under the Securities Act of 1933, as amended and
        only on days that the trading window is open under the PacifiCare
        Insider Trading Policy; provided, however, that:

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UniHealth Foundation
March 7, 2001
Page 2

               (i)    the number of Remaining Shares sold during the term of
                      this Letter Agreement does not exceed the volume
                      limitations contained in Rule 144 promulgated under the
                      Securities Act of 1933, as amended, for affiliates; and

               (ii)   on any given day UniHealth does not sell more than the
                      greater of: (a) two hundred fifty thousand (250,000) of
                      the Remaining Shares or (b) twenty-five percent (25%) of
                      the trading volume of PacifiCare's common stock for the
                      immediately preceding trading day.

2.      This Letter Agreement shall terminate on June 15, 2001. It is
        PacifiCare's position that any sale of the Remaining Shares after June
        15, 2001 shall be conducted as contemplated by the Stock Purchase
        Agreement prior to this modification. It is UniHealth's position that
        any sales of the Remaining Shares after June 15, 2001 will not be
        subject to the restrictions of subsections 7.1 and 9.2 of the Stock
        Purchase Agreement.

3.      Except as expressly stated herein, the parties do not intend to modify
        the Stock Purchase Agreement.

4.      The Stock Purchase Agreement and any other agreement entered into
        contemporaneously therewith, together with this Letter Agreement, set
        forth the entire agreement of the parties and are intended to supersede
        all prior negotiations, understandings, and agreements and cannot be
        altered, amended, changed or modified in any respect or particular
        unless each such alteration, amendment, change or modification shall
        have been agreed to by PacifiCare and UniHealth and reduced to writing
        in its entirety and signed and delivered by each party.

5.      This Letter Agreement may be executed in counterparts, each of which
        together shall comprise one and the same instrument.

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UniHealth Foundation
March 7, 2001
Page 3

Please confirm your acceptance to the terms and provisions of this agreement by
signing below.

Very truly yours,

PACIFICARE HEALTH SYSTEMS, INC.

By:
   ----------------------------------------
Its:
    ---------------------------------------

AGREED AND ACCEPTED:

UNIHEALTH FOUNDATION

By:
   ----------------------------------------
Its:
    ---------------------------------------

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