10 Largest Health Insurance Companies by Membership

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4. HCSC

We are continuing our list of largest health insurance companies by membership with HCSC, or Health Care Service Corporation, that is the parent company of Blue Cross and Blue Shield, which is a federation of 36 separate U.S health insurance companies. HSCS was founded in 1936. The company covers 15 million Americans, mostly in Illinois, Montana, New Mexico, Oklahoma, and Texas.

10 Largest Health Insurance Companies by Membership

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