A single health insurer controls at least half of the commercial health insurance market in 15 states, and a Blue Cross Blue Shield company is the largest insurer in 43 of 50 states and the District of Columbia, according to the latest American Medical Association (AMA) study of insurer competition. In Alabama, Blue Cross and Blue Shield of Alabama holds 84% of the market.
One Insurer Controls Half the Market in 15 States, AMA Finds














