- AARP-United Health Group
- Admar
- Advantage Plus
- Aetna
- American PPO
- Beech Street Corporation
- BCE Emergis
- Blue Cross
- Blue Shield
- CappCare PPO
- CareTrust Networks
- CCN
- ChoiceCare Network
- Choice One
- Cigna
- Community Health Group
- First Health Network
- FOCUS HealthCare Management
- Foundation for Medical Care
- Galaxy Health Network
- Great West HealthCare (was One Healthplan)
- Health Management Network
- HealthNet
- Humana
- InterPlan
- Medicare
- Medi-Cal
- Molina HealthCare Medi-Cal
- Motion Picture Industry
- MultiPlan PPO
- NALC/First Health
- Nationwide
- Nippon Life Ins. Co./ Principal
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- NPPN
- Orange County Foundation for Med. Care
- Operating Engineers Trust Fund
- Plan Vista Solutions/NPPN
- Personal Insurance Admin
- PPO Next
- Preferred Health Network
- Premier Access
- Principal Life
- Private Health Systems (PHCS)
- ProNet
- Sheet Metal Health & Welfare Plan
- Standard Life & Accident Ins. Co.
- The Reny Company PPO
- Three Rivers Provider Network
- Tri-Care/Tri-West (Champus)
- Tri-Care for Life/Tri-West (Champus)
- Tribal Health Partners TPA
- TrustMark Life Ins.
- United HealthCare
- Universal Care
- Unicare PPO Prudent Buyer
- Union Roofers Health & Welfare Fund
- USA Managed Care Organization
- Union Roofers Health & Welfare Fund
- USA Managed Care Organization
- Wausau
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