Total Employees: 390

Current Member Enrollment as of December 31, 2006:

Commercial: 141,264
Medicare: 14,252
Medi-Cal: 15,743
Total: 171,259

Corporate Offices
400 Corporate Pointe, Suite 525
Culver City, CA 90230

Administrative Offices — Alta Healthcare Systems
11500 West Olympic Blvd., Ste 502
Los Angeles, CA 90064
310-943-4500

Administrative Offices — ProMed Healthcare Administrators
4150 E. Concours St.
Ontario, CA 91764
909-932-1045

Administrative Offices — Prospect Medical Systems
1920 E. 17TH Street Ste. 200
Santa Ana, CA 92705
800-708-3230

Administrative Offices — Sierra Medical Management
44469 N. 10th St. West
Lancaster, CA 93534
661-945-9411