- Aetna Healthcare
- Affiliated Health Funds
- Beech Street
- Blue Cross/Blue Shield Association
- Blue Cross of California
- Blue Shield of California
- Cigna HealthCare of California
- Community Care Network (CCN)
- Envisioncare Triage-Advocate, Inc.
- First Health Network (NPP)
- HealthNet
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- Humana, Inc.
- Kaiser Permanente
- LifeTrac Networks
- Molina Medical Centers
- One Health Plan of California, Inc.
- PacifiCare of California
- Three Rivers Provider Network
- Tricare Federal Services
- United HealthCare
- United Resource Networks (URN)
- Universal Care
- Universal Health Network
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- Affiliated Doctors of Orange County
- Affiliated Health Funds
- All Care Medical Group, Inc.
- Allianz Life Insurance
- Allied Physicians IPA
- Antelope Valley Medical Group
- APAC Medical Group, Inc.
- Arcadia Health City IPA
- Axminster Medical Group, Inc.
- Beaver Medical Group
- Bella Vista Medical Group
- Bright Medical Associates
- Bristol Park Medical Group
- Cancer Center of Santa Barbara
- Chino Medical Group
- Desert Medical Group
- Doctors Medical Group
- Gateway Medical Group, Inc.
- Gateway Physicians Medical Associates, Inc.
- Global Care Medical Group
- Greater Covina Medical Group
- Greater Orange County Medical Group
- Greater San Gabriel Physicians IPA
- Health Care Los Angeles, IPA
- HealthCare Partners Affiliates Medical Group
- High Desert Medical Group
- HYE Multi-Specialty Medical Group
- Lakeside Medical Group, Inc.
- Mabuhay Medical Group
- Med Premises Medical Group
- Mid-Cities IPA
- Mission Community IPA
- Mission Hospital Affiliated Physicians
- Monarch HealthCare Medical Group, Inc.
- Northeast Valley Health Corporation
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- Nuestra Familia Medical Group
- Northwest Orange County Medical Group
- Ojai Valley Community Medical Group
- Pacific Independent Physicians Association (PIPA)
- Pegasus Medical Group
- Physician Associates of Greater San Gabriel Valley
- Physicians of Greater Long Beach IPA
- PrimeCare Medical Group of Chino Valley, Inc.
- PrimeCare Medical Group of Corona, Inc.
- PrimeCare Medical Group of Hemet, Inc.
- PrimeCare Medical Group of Inland Valley, Inc.
- PrimeCare Medical Group of Moreno Valley, Inc.
- PrimeCare Medical Group of Redlands, Inc.
- PrimeCare Medical Group of Riverside, Inc.
- PrimeCare Medical Group of Sun City, Inc.
- PrimeCare Medical Group of Temecula, Inc.
- Professional Care Medical Group, Inc.
- Prospect Healthsource Medical Group, Inc.
- Prospect Medical Group
- Prospect NWOC Medical Group
- Prospect Professional Care Medical Group, Inc.
- Riverside Family Health Medical Group
- Riverside Medical Clinic
- Sierra Medical Group
- Southern California Permanente Medical Group (Kaiser)
- Starcare Medical Group, Inc.
- St. Joseph Heritage Medical Group
- St. Joseph Hospital Affiliated Physicians
- St. Jude Heritage Medical Group
- St. Jude Hospital Affiliated Physicians
- Valley Physicians of Central CA MA
- Verdugo Hills Medical Group
- Victor Valley IPA
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