Exhibit 21.1

Subsidiaries of Registrant

·Prospect Medical Systems, Inc., a Delaware corporation

·Prospect Hospital Advisory Services, Inc., a Delaware corporation

·ProMed Health Services Company, a California corporation

·ProMed Health Care Administrators, a California corporation

·Alta Hospitals System, LLC, a California limited liability company

·Alta Los Angeles Hospitals, Inc., a California corporation

·Alta Hollywood Hospitals, Inc., a California corporation

·Brotman Medical Center, Inc., a California corporation

·Prospect Medical Group, Inc., a California corporation

·Prospect Health Source Medical Group, Inc., a California professional medical corporation

·Prospect Professional Care Medical Group, Inc., a California professional medical corporation

·Prospect NWOC Medical Group, Inc., a California professional medical corporation

·Genesis Healthcare of Southern California, Inc., a Medical Group, a California professional medical corporation

·StarCare Medical Group, Inc., aCalifornia professional medical corporation

·Pomona Valley Medical Group, Inc., a California professional medical corporation

·Upland Medical Group, a Professional Medical Corporation, a California professional medical corporation

·Nuestra Familia Medical Group, Inc., a California professional medical corporation

·APAC Medical Group, Inc., a California professional medical corporation

·      Santa Ana/Tustin Physicians Group, Inc., a California professional medical corporation

·AMVI/Prospect Health Network, a joint venture partnership

·Prospect Physician Associates, Inc., a California corporation

·Pinnacle Health Resources, a California corporation

·Prospect Advantage Network, Inc., a California corporation