December 5, 2003 Ronald A. Williams Re: Specified Entities Dear Ron:

Exhibit 10.25

000 Xxxxxxxxxx Xxxxxx
Xxxxxxxx, XX 00000

Xxxx X. Xxxx, M.D.
Chairman & CEO
000-000-0000
Fax: 000-000-0000

December 5, 2003

Xxxxxx X. Xxxxxxxx

Re: Specified Entities

Dear Xxx:

In connection with the execution of your Amended and Restated Employment Agreement of even date (the “Agreement”), the names of the four Specified Entities, as defined in the Agreement, currently are as follows:

	1.		Anthem Inc.
	2.		CIGNA Corporation
	3.		UnitedHealth Group Incorporated
	4.		Wellpoint Health Networks Inc.

Sincerely,

Aetna Inc.

By: /s/ Xxxx X. Xxxx