EXHIBIT 10. 

STOCK OPTION AGREEMENT  

        **STOCK OPTION AGREEMENT**made as of  October 4, 2004 between NATIONAL MEDICAL HEALTH CARD SYSTEMS, INC., a Delaware corporation (the"Company"), and Bill Masters (Optionee").  

        **WHEREAS**,the Optionee is an employee of the Company or a subsidiary thereof;  

        **WHEREAS**,the Company desires to provide to the Optionee an additional incentive to promote thesuccess of the Company;  

        **NOW,THEREFORE**, in consideration of the foregoing, the Company hereby grants to theOptionee (the “Grant”) the right and option to purchase Common Shares of theCompany under and pursuant to the terms and conditions of the 1999 Stock Option Plan (the“Plan”) and upon and subject to the following terms and conditions:  

    1.                 **GRANT OF OPTION**. The Company hereby grants to the Optionee the right and          option (the “Option”) to purchase Fifty Thousand Common Shares of the          Company (the “Option Shares”) during the following periods: 

    (a)                 All or any part of twelve thousand five hundred (12,500) common Shares may be          purchased during the period commencing one year from the date hereof and          exercisable through the close of business on October 3, 2014 (the          “Expiration Date”). 

    (b)                 All or any part of twelve thousand five hundred (12,500) common Shares may be          purchased during the period commencing two years from the date hereof and          exercisable through the Expiration Date. . 

    (c)                 All or any part of twelve thousand five hundred (12,500) common Shares may be          purchased during the period commencing three years from the date hereof and          exercisable through the Expiration Date. 

    (d)                 All or any part of twelve thousand five hundred (12,500) common Shares may be          purchased during the period commencing four years from the date hereof and          exercisable through the Expiration Date. 

    2.                 **NATURE OF OPTION**. All Stock Options granted under this Agreement shall          qualify as incentive stock options under Section 422 of the Internal Revenue          Code of 1986, as amended (the “Code”), subject to the limitations of          Section 422 of the Code. 

    3.                 **EXERCISE PRICE**. The exercise price of each of the Option Shares shall be          Nineteen Dollars and Eighty cents ($19.80) (the “Option Price”). 

    4.                 **EXERCISE OF OPTIONS**. The Option shall be exercised in accordance with the          provisions of the Plan. As soon as practicable after the receipt of notice of          exercise (in the form annexed hereto as Exhibit A) and payment of the Option          Price as provided for in the Plan, the Company shall tender to the Optionee          certificates issued in the Optionee’s name evidencing the number of Option          Shares covered thereby. 

    5.                 **TRANSFERABILITY**. The Option shall not be transferable other than by will          or the laws of descent and distribution and, during the Optionee’s          lifetime, shall not be exercisable by any person other than the Optionee. 

    6.                 **CHANGE OFCONTROL.** In the event of a Change in Control (as defined in the          Employment Agreement), any Options granted hereunder which have not vested as of          the date of the Change in Control shall automatically vest on such date,          provided that no acceleration of exercisability shall occur with respect to an          outstanding Option if and to the extent such Option is, in connection with the          Change in Control, to be assumed or otherwise continued in full force or effect          by the successor entity (or parent thereof) pursuant to the terms of the Change          in Control transaction. 

    7.                 **INCORPORATION BY REFERENCE**. The terms and conditions of the Plan are          hereby incorporated by reference and made a part hereof. 

    8.                 **NOTICES**. Any notice or other communication given hereunder shall be          deemed sufficient if in writing and hand delivered or sent by registered or          certified mail, return receipt requested, addressed to the Company, 26 Harbor          Park Drive, Port Washington, New York 11050, Attention: Jonathan Friedman and to          the Optionee at the address indicated below. Notices shall be deemed to have          been given on the date of hand delivery or mailing, except notices of change of          address, which shall be deemed to have been given when received. 

    9.                 **BINDING EFFECT**. This Agreement shall be binding upon and inure to the          benefit of the parties hereto and their respective legal representatives,          successors and assigns. 

    10.                 **ENTIRE AGREEMENT**. This Agreement, together with the Plan, contains the          entire understanding of the parties hereto with respect to the subject matter          hereof and may be modified only by an instrument executed by the party sought to          be charged. 

        **INWITNESS WHEREOF**, the parties have executed this Agreement as of the day and year firstabove written. 

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                                                     NATIONAL MEDICAL HEALTH
                                                     CARD SYSTEMS, INC.
                                                     By:

                                                     ____________________________________
                                                        James Bigl, Chairman of the Board

                                                     ____________________________________
                                                              Signature of Optionee

                                                     ____________________________________
                                                        Name of Optionee
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EXHIBIT A 

NATIONAL MEDICALHEALTH CARD SYSTEMS, INC. 

a.              OPTION EXERCISE FORM 

        Theundersigned hereby irrevocably elects to exercise the within Option dated__________________ to the extent of purchasing___________________ Common Shares ofNational Medical Health Card Systems, Inc. The undersigned hereby makes a payment of$______________ in payment therefor. 

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                                                                                        ________________________
                                                                                           Name of Optionee

                                                                                        ________________________
                                                                                          Signature of Optionee

                                                                                        ________________________
                                                                                          Address of Holder

                                                                                        ________________________
                                                                                               Date
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