X0202 4 2008-02-25 1 0000754009 SIERRA HEALTH SERVICES INC SIE 0001185385 WATSON ANTHONY L 2724 N. TENAYA WAY LAS VEGAS NV 89128 1 0 0 0 Common Stock 2008-02-25 4 D 0 7253 43.50 D 0 D Non-Employee Stock Option (Right to Buy) 3.0937 2008-02-25 4 D 0 15000 40.4063 D 2001-03-01 2010-02-28 Common 15000 0 D Non-Employee Stock Option (Right to Buy) 4.41 2008-02-25 4 D 0 15000 39.09 D 2003-01-22 2012-01-21 Common 15000 0 D Non-Employee Stock Option (Right to Buy) 7.10 2008-02-25 4 D 0 15000 36.40 D 2004-01-21 2013-01-20 Common 15000 0 D Non-Employee Stock Option (Right to Buy) 13.865 2008-02-25 4 D 0 20000 29.635 D 2005-01-20 2014-01-19 Common 20000 0 D Non-Employee Stock Option (Right to Buy) 26.915 2008-02-25 4 D 0 20000 16.585 D 2006-01-20 2015-01-19 Common 20000 0 D Shares, including restricted stock units, disposed of pursuant to the merger agreement between Sierra Health Services, Inc. and UnitedHealth Group Incorporated for a cash payment of $43.50 per share. This disposition occurred on the effective date of the merger. Options disposed of pursuant to the merger agreement between Sierra Health Services, Inc. and UnitedHealth Group Incorporated for a cash payment for each option share equal to $43.50 minus the per share exercise price of the option. This disposition occurred on the effective date of the merger. Exercisable as to 20% on each of 3/1/01, 3/1/02, 3/1/03, 3/1/04 and 3/1/05. Exercisable as to 20% on each of 1/22/03, 1/22/04, 1/22/05, 1/22/06 and 1/22/07. Exercisable as to 20% on each of 1/21/04, 1/21/05, 1/21/06, 1/21/07 and 1/21/08. The options became fully vested upon consummation of the merger. Exercisable as to 20% on each of 1/20/05, 1/20/06, 1/20/07, 1/20/08 and 1/20/09. The options became fully vested upon consummation of the merger. Exercisable as to 20% on each of 1/20/06, 1/20/07, 1/20/08, 1/20/09 and 1/20/10. The options became fully vested upon consummation of the merger. Anthony L. Watson/Jayne Primaky, POA 2008-02-25