The most popular form of health insurance in the United States is employer-sponsored group health coverage, which covers over 150 million working Americans. Among individual commercial health insurance carriers, UnitedHealth Group commands the largest market share and membership base nationwide, closely followed by major managed-care heavyheads like Anthem (Elevance Health), CVS Health (Aetna), and Humana, alongside massive state-specific plans like Kaiser Permanente.
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