- 20th Century Insurance Company
- 3M
- ACCMA Foundation (PPO & EPO)
- Affordable Network
- Allmerica Financial
- Anthem Health
- Argonaut
- Bankers United Life Assurance Company
- Blue Shield of California
- The Board of Pensions of the Presbyterian Church
- Business Man's Assurance Company of America
- CareAmerica (PPO)
- CareAmerica Health Plans
- CareOne
- Central States, Southeast and Southwest Areas Health and Welfare Fund
- Central United Life
- Chiropractic Health Plan of California
- CNA Insurance Companies
- Continental Casualty Company
- CoreSource
- County of Lake Group Health Plan, Inc.
- CUNA Mutual Insurance Group
- Employer Administrative Services Company
- Employers Health Insurance (Humana, Inc.)
- Escobar Diversified Service
- FHP, Inc./TakeCare Health Plan, Inc.
- FHP Life (PPO)
- First Allmerica Financial Life Insurance Company
- Foundation for Medical Care of Santa Clara County (PPO & EPO)
- Foundation Health Benefit Life Ins. Company
- Foundation Health Corporation
- Foundation Health Senior Value
- Fortis Benefits
- Fortis, Inc.
- Guardian
- General American
- Great-West Life & Annuity Insurance Company
- Great West Life Insurance
- Health Care Foundation of San Francisco (PPO & EPO)
- Health Care Foundation of Superior California
- Healthsource Provident Administrators, Inc.
- Interplan
- Inter Valley Health Plan
- Irvine Unified School District
- Jefferson Pilot Life Insurance
- John Alden Life Insurance Company
- Joint Benefit Trust
- Key Health Plan, Inc.
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- Life Investors Insurance Company of America
- Lifeguard Health Care
- Lifeguard PPO
- Lincoln National Life Insurance Company
- Marin Foundation for Medical Care
- Masco Corporation (MascoTech, Inc.; TriMas Corporation)
- Maxicare
- Maxicare Life & Health Insurance Company
- Medicare
- The MEGA Life Insurance Company
- Mennonite Mutual Aid Assocation and MMA Insurance Company
- Motorola
- The National Asbestos Workers Medical Fund (NAW)
- National Automatic Sprinkler Industry Welfare Fund
- National Elevator Industry Health Plan
- National Health Plans, Inc.
- National IAM Benefit Trust (IAM)
- New England Mutual Life Insurance Company
- Northwestern National Life Insurance
- NYLCare Health Plan, Inc.
- Omni Health Care
- One Health Plan
- Pacific Health Alliance
- Pacific Mutual Life Insurance Company
- Pan-American Life Insurance Company
- Personal Care Medical Group
- PFL Life Insurance Company
- Phoenix
- PM Group Life Insurance Company (Pacific Mutual)
- Preferred Health Network
- Private Health Care System
- Provident American Life Insurance Company
- Prudential
- Prunetwork
- ReliaStar Life Insurance Company
- Risk Management Services
- The Salvation Army
- Scan Health Care
- Screen Actors Guild-Producers Health Plan
- Sonoma Foundation for Medical Care
- TakeCare Preferred Network (PPO)
- Tamar Corporation
- Time Insurance Company
- Tower Life Insurance Company
- Trustmark Insurance Company
- United Health Plan for Seniors
- The United States Life Insurance Company (USL)
- Universal Care
- Western Health Network
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