Who Are The Largest Health Insurance Companies In The Us? 
According to the National Association of Insurance Commisioners -LRB- NAIC -RRB- the following are the top 10 Health Insurance Companies : 1 . United Healthcare 2 . Wellpoint Inc. . Group -LRB- Blue Cross and Blue Shield Association serving members in California , Colorado , Connecticut , Georgia , Indiana , Kentucky , Maine , Missouri , Nevada , New Hampshire , New York , Ohio , Virginia and Wisconsin -RRB- 3 . Kaiser Foundation 4 . Aetna Group 5 . Humana 6 . HCSC -LRB- Blue Cross and Blue Shield of Texas , New Mexico , Illinois , Oklahoma -RRB- 7 . Coventry Corp. . Group -LRB- although they were purchased by Aetna -RRB- 8 . Highmark Group -LRB- Blue Cross Blue Shield of Pennsylvania and other companies -RRB- 9 . Independence Group 10 . Blue Shield of California 