Tenet Healthcare Corporation, and its subsidiaries (Tenet) is an investor-owned health care services company whose subsidiaries and affiliates own and operate acute care hospitals, ambulatory surgery centers, diagnostic imaging centers and related health care facilities. Its core business is focused on providing acute care treatment, including inpatient care, intensive care, cardiac care, radiology services and emergency medical treatment, as well as outpatient services. Tenet�s operations include the California region, the Central region, the Florida region and the Southern States region. During the year ended December 31, 2011, it acquired 15 outpatient centers - four diagnostic imaging centers, a majority interest in one other diagnostic imaging center, three oncology centers, an urgent care center, a majority interest in five ambulatory surgery centers, and a majority interest in one other ambulatory surgery center in which it previously held a minority interest.