- AETNA US Healthcare
- America's Health Plan
- Beech Street Managed Care
- Blue Cross Blue Shield
- CHAMPUS
- CIGNA Preferred
- Corvel
- Cost Care
- Empire Medical Network
- Harvard Pilgrim Health Care
- Health Care Value Management
- Health Net
- Health Source
- Healthcare Manager
- HMC PPO
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- Managed Comp
- Medicare
- Multiplan
- Preferred Plan of MA
- Private Health Care Systems
- Sierra Military Health Services
- TeamCare
- Tufts Health Plans
- Unicare
- United Healthcare
- USA Managed Care
- Windham Associates
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