MANTECA, Calif. – Dec. 4, 2006 – Tenet California announced today that Mark Lisa has been named chief executive officer of Tenet’s Doctors Hospital of Manteca, a 73-bed acute care facility located in Manteca. Lisa, 46, most recently served as the chief operating officer of Doctors Hospital of Laredo in Texas.

    A veteran hospital leader with nearly 28 years of experience as a health care executive, Lisa will be responsible for all strategic, operational and clinical activities at DHM effective December 11, 2006.

    “Mark Lisa is a veteran health care executive who brings a proven track record of implementing quality patient service and progressive business strategy to Manteca,” said Stephen L. Newman, chief executive officer of Tenet California. “We welcome his broad expertise in health care leadership and in building quality care into everything he does.”

    Prior to his position in Texas, Lisa served as the chief executive officer of Thayer County Health Services, a not-for-profit health system in south central Nebraska, for two and a half years. He also spent 20 years in the United States Navy, where he held a series of progressively responsible positions in health services administration.

    Lisa holds a bachelor’s degree in information systems management from Saint Martin’s College in Lacey, Wash. and a master’s degree in health administration from Chapman University in Orange, Calif. He is board-certified by, and a fellow of, the American College of Healthcare Executives.

    Tenet California, a region of Tenet Healthcare Corporation (NYSE: THC), comprises 17 acute care hospitals in California and one in Nebraska with approximately 4,381 beds and numerous related health care services. The region includes USC University Hospital in Los Angeles and Creighton University Medical Center in Omaha, Neb. – two renowned academic medical centers – as well as major urban and community hospitals that serve large and diverse populations in Southern, Northern and Central California.

    Tenet California’s hospitals are Alvarado Hospital Medical Center, Community Hospital of Los Gatos, Desert Regional Medical Center, Doctors Hospital of Manteca, Doctors Medical Center of Modesto, Fountain Valley Regional Hospital and Medical Center, Garden Grove Hospital and Medical Center, Irvine Regional Hospital and Medical Center, John F. Kennedy Memorial Hospital, Lakewood Regional Medical Center, Los Alamitos Medical Center, Placentia-Linda Hospital, San Dimas Community Hospital, San Ramon Medical Center, Sierra Vista Regional Medical Center, Twin Cities Community Hospital and USC University Hospital. The region’s sole Nebraska hospital is Creighton University Medical Center in Omaha. Tenet California also includes USC Norris Cancer Hospital, a specialty hospital. Tenet’s hospitals aim to provide the best possible care to every patient who comes through their doors, with a clear focus on quality and service. Tenet can be found on the World Wide Web at www.tenethealth.com.