EXHIBIT 4.12(ii)

EXECUTION COPY

EXTENSION AGREEMENT dated as of June 28, 2004 (this “ Extension Agreement ”), to the Amended and Restated 364-Day Credit Agreement dated as of July 1, 2003 (the “ Credit Agreement ”), among ANTHEM, INC., an Indiana corporation (the “ Company ”); the LENDERS party thereto; JPMORGAN CHASE BANK, as Administrative Agent; BANK OF AMERICA, N.A. and WACHOVIA BANK, NATIONAL ASSOCIATION, as Syndication Agents; and FLEET NATIONAL BANK and WILLIAM STREET COMMITMENT CORPORATION, as Documentation Agents.

A. Pursuant to the Credit Agreement, the Lenders have extended and agreed to extend credit to the Company from time to time during the Availability Period, which period shall end on a date no later than the day immediately preceding the Termination Date.

B. In connection with the pending merger of the Company and WellPoint Health Networks Inc., the Company requested to amend the Credit Agreement to extend the Termination Date, and the Availability Period under the Credit Agreement, to August 31, 2004.

C. The Lenders whose signatures appear below are willing, on the terms and subject to the conditions set forth herein, to extend the Termination Date, and the Availability Period during which the Company may draw their respective Commitments, as requested by the Company.

D. Capitalized terms used and not otherwise defined herein have the meanings assigned to them in the Credit Agreement.

Accordingly, in consideration of the mutual agreements contained herein and other good and valuable consideration, the sufficiency and receipt of which are hereby acknowledged, the parties hereto agree as follows:

SECTION 1. Definitions . For purposes of this Extension Agreement, the term “ Amendment Effectiveness Time ” means (a) if each of the Lenders is a party hereto, 5:00 p.m. New York City time, on the Extension Agreement Effectiveness Date (as defined below) or (b) if the Lenders constituting the Required Lenders (but less than all the Lenders) are party hereto, 5:00 p.m., New York City time, on June 28, 2004, provided that, in the case of this clause (b), the Company shall have paid in full to each of the Lenders not a party hereto (each, a “ Non-Extending Lender ”) the principal of and interest accrued on each Loan made by it and all other amounts owing to it or accrued for its account under the Credit Agreement.

SECTION 2. Amendment . At the Amendment Effectiveness Time:

(a) Section 1.01 of the Credit Agreement shall be amended by amending and restating the definition of the term “Termination Date” in its entirety as follows:

““ Termination Date ” means August 31, 2004.”; and

(b) the Commitment of each Non-Extending Lender, if any, shall automatically terminate and each such Lender shall be released from its obligations under the Credit Agreement and shall cease to be a party thereto, but shall continue to be entitled to the benefits of Sections 2.13, 2.14, 2.15 and 8.03 of the Credit Agreement as in effect immediately prior to the Amendment Effectiveness Time.

SECTION 3. Representations and Warranties. To induce the other parties hereto to enter into this Extension Agreement, the Company represents and warrants to each of the Lenders and the Administrative Agent that (a) this Extension Agreement has been duly executed and delivered by the Company and constitutes a legal, valid and binding obligation of the Company enforceable against it in accordance with its terms and (b) after giving effect to this Extension Agreement, (i) the representations and warranties of the Company set forth in Article III of the Credit Agreement are true and correct in all material respects on and as of the date hereof (except to the extent such representations and warranties expressly relate to an earlier date, in which case such representations and warranties are true and correct in all material respects on and as of such earlier date); and (ii) no Default or Event of Default has occurred and is continuing.

SECTION 4. Effectiveness of this Extension Agreement . This Extension Agreement shall become effective as of the date set forth above on the date (such date, the “ Extension Agreement Effectiveness Date ”) that the Administrative Agent or its counsel shall have received counterparts of this Extension Agreement that, when taken together, bear the signatures of the Company, the Administrative Agent and each of the Lenders party hereto, provided that such Lenders constitute the Required Lenders.

SECTION 5. Ef