Health insurance (major medical insurance)

* AARP
    * Aetna
    * American Family Insurance
    * American National Insurance Company
    * Amerigroup
    * Anthem Blue Cross and Blue Shield
    * Assurant
    * Blue Cross and Blue Shield Association
    * Celtic Insurance Company, subsidiary of Centene Corporation
    * Centene Corporation
    * Cigna
    * Coventry Health Care
    * EmblemHealth
    * Fortis
    * Golden Rule Insurance Company
    * Group Health Cooperative
    * GHI
    * Health Net
    * HealthMarkets
    * HealthSpring
    * Highmark
    * Humana
    * Independence Blue Cross
    * Kaiser Permanente
    * LifeWise Health Plan of Oregon
    * Medical Mutual of Ohio
    * Molina Healthcare
    * Premera Blue Cross
    * Principal Financial Group
    * The Regence Group
    * Shelter Insurance
    * Thrivent Financial for Lutherans
    * UnitedHealth Group
    * Unitrin
    * Universal American Corporation
    * WellCare Health Plans
    * WellPoint