UnitedHealth Group (NYSE:UNH) and Sierra Health Services, Inc. (NYSE:SIE) today announced that they have received an order granting approval of their merger from the Commissioner of Nevada's Division of Insurance.

Kenneth A. Burdick, chief executive officer of UnitedHealthcare, said, ?We look forward to continuing Sierra's tradition of providing access to quality, affordable health care, as well as bringing a broad range of new products and services to Nevadans. We recognize the value that a local health care company can provide to a community. We will continue to have a strong Nevada presence and build upon Sierra's reputation as a good corporate citizen.?

The transaction, subject to federal regulatory approval and other customary closing conditions, is expected to be completed by the end of 2007.

About UnitedHealth Group

UnitedHealth Group (www.unitedhealthgroup.com) is a diversified health and well-being company dedicated to making health care work better. Headquartered in Minneapolis, Minn., UnitedHealth Group offers a broad spectrum of products and services through six operating businesses: UnitedHealthcare, Ovations, AmeriChoice, Uniprise, Specialized Care Services and Ingenix. Through its family of businesses, UnitedHealth Group serves more than 70 million individuals nationwide.

About Sierra Health Services, Inc.

Sierra Health Services, Inc., based in Las Vegas, is a diversified healthcare services company that operates health maintenance organizations, indemnity insurers, preferred provider organizations, prescription drug plans and multi-specialty medical groups. Sierra's subsidiaries serve over 860,000 people through health benefit plans for employers, government programs and individuals. For more information, visit the Company's website at www.sierrahealth.com.

Forward-Looking Statements

This press release may contain statements, estimates, projections, guidance or outlook that constitute ?forward-looking? statements as defined under U.S. federal securities laws. Generally the words ?believe,? ?expect,? ?intend,? ?estimate,? ?anticipate,? ?plan,? ?project,? ?will? and similar expressions, identify forward-looking statements, which generally are not historical in nature. These statements may contain information about financial prospects, economic conditions, trends and unknown certainties. We caution that actual results could differ materially from those that management expects, depending on the outcome of certain factors. These forward-looking statements involve risks and uncertainties that may cause UnitedHealth Group's actual results to differ materially from the results discussed in the forward-looking statements. Some factors that could cause results to differ materially from the forward-looking statements include: the potential consequences of the findings announced on October 15, 2006 of the investigation by an Independent Committee of directors of our historic stock option practices, the consequences of the restatement of our previous financial statements, related governmental reviews, including a formal investigation by the SEC, and review by the IRS, U.S. Congressional committees, U.S. Attorney for the Southern District of New York and Minnesota Attorney General, a related review by the Special Litigation Committee of the Company, and related shareholder derivative actions, shareholder demands and purported securities and Employee Retirement Income Security Act (ERISA) class actions, the resolution of matters currently subject to an injunction issued by the United States District Court for the District of Minnesota, a purported notice of acceleration with respect to certain of the Company's debt securities based upon an alleged event of default under the indenture governing such securities, and recent management and director changes, and the potential impact of each of these matters on our business, credit ratings and debt; increases in health care costs that are higher than we anticipated in establishing our premium rates, including increased consumption of or costs of medical services; heightened competition as a result of new entrants into our market, and consolidation of health care companies and suppliers; events that may negatively affect our contract with AARP; uncertainties regarding changes in Medicare, including coordination of information systems and accuracy of certain assumptions; funding risks with respect to revenues received from Medicare and Medicaid programs; increases in costs and other liabilities associated with increased litigation, legislative activity and government regulation and review of our industry; our ability to execute contracts on competitive terms with physicians, hospitals and other service providers; regulatory and other risks associated with the pharmacy benefits management industry; failure to maintain effective and efficient information systems, which could result in the loss of existing customers, difficulties in attracting new customers, difficulties in determining medical costs estimates and appropriate pricing, customer and physician and health care provider disputes, regulatory violations, increases in operating costs, or other adverse consequences; possible impairment of the value of our intangible assets if future results do not adequately support goodwill and intangible assets recorded for businesses that we acquire; potential noncompliance by our business associates with patient privacy data; misappropriation of our proprietary technology; and anticipated benefits of acquisitions that may not be realized.

This list of important factors is not intended to be exhaustive. A further list and description of some of these risks and uncertainties can be found in both companies' reports filed with the Securities and Exchange Commission from time to time, including annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K. Any or all forward-looking statements we make may turn out to be wrong. You should not place undue reliance on forward-looking statements, which speak only as of the date they are made. Except to the extent otherwise required by federal securities laws, we do not undertake to publicly update or revise any forward-looking statements.

UnitedHealth Group
John Penshorn, 952-936-7214
Senior Vice President
or
Media:
Tyler Mason, 714-226-3530
UnitedHealthcare
or
Sierra Health Services
Peter O'Neill, 702-242-7156
Vice President
Public & Investor Relations