UnitedHealth Group And Sierra Health Services Receive Merger Approval From California Department Of Insurance

Companies Receive All Required State Regulatory Approvals To Complete Merger

UnitedHealth Group (NYSE: UNH) and Sierra Health Services, Inc. (NYSE: SIE) today announced that the California Department of Insurance has granted approval of their merger. With this announcement, recent approval from the Nevada Division of Insurance and the consent of the Arizona Department of Insurance, UnitedHealth Group and Sierra have received all necessary state regulatory reviews and approvals to complete the merger. The companies continue to work with the Department of Justice to receive final regulatory approval. The transaction is expected to be completed by the end of 2007.