Exhibit 10.94

FIRST AMENDMENT TO OFFICE LEASE

This First Amendment, dated as of December 1, 2003, amends the Office Lease dated July __, 2003, between CONOCOPHILLIPS COMPANY, a Delaware corporation (“Landlord”), and HEALTH NET OF ARIZONA, INC., an Arizona corporation (“Tenant”).

1. Terms. All capitalized terms in this First Amendment have the same meanings as set forth in the Lease.

2. Commencement Date. Landlord and Tenant hereby confirm that the Commencement Date of the Lease was November 24, 2003 and that all Tenant Improvements to be constructed by Landlord under the original Lease were satisfactorily completed.

3. Expansion Space. Effective as of April 15, 2004, regardless of whether the Tenant Improvements for the Expansion Space have been completed (the “Expansion Date”), there shall be added to and incorporated into the Premises for all purposes for the balance of the Lease Term (as the Term may be extended) the “Expansion Premises”, consisting of approximately 4,786 square feet of Rentable Area (4,235 square feet of Usable Area) on the third floor of the Building as shown on the attached Exhibit A, for a total Rentable Area for the Premises of 38,471 square feet.

4. Base Rent. The table contained in Section 1.5 of the Lease is amended to read as follows and the paragraph following the table in that Section is deleted:

5. Improvements. Landlord and Tenant shall cooperate with respect to the preparation of plans and specifications for Tenant Improvements in the Expansion Premises (“Plans”). Landlord shall construct the Tenant Improvements for the Expansion Space in accordance with the mutually-approved Plans and construction schedule, and Tenant shall pay all Costs of Construction of such Tenant Improvements in excess of $38.00 per square foot of Usable Area of the Expansion Premises. The Architect shall be DFD Cornoyer Hedrick and the general contractor shall be Ryan Companies US, Inc. Paragraphs 2, 3, 4, 5, and 7 of Exhibit C to the Lease shall apply to the construction of Tenant Improvements in the Expansion Premises.

6. Other Changes. From and after the Expansion Date:

(a) Tenant’s Proportionate Share shall be increased from 21.42% to 24.06%.

(b) The number of parking spaces that Tenant is entitled to use pursuant to Section 1.9 of the Lease shall be increased from 30 covered reserved spaces, 90 covered unreserved spaces, and 30 uncovered unreserved spaces to 36 covered reserved spaces, 102 covered unreserved spaces, and 36 uncovered unreserved.

7. Effect of Amendment. Except as specifically modified by this First Amendment, all of the terms and conditions of the Lease continue in full force and effect.