The American Medical Association finds a sharp drop in competition in the U.S. health insurance business.
In the combined HMO and PPO markets, 95% of metropolitan areas have few competing health insurers, according to the AMA, Chicago.
In 95% of markets, a single insurer had 30% or more of the business, the physician group says, and in 56% of markets, a lone insurer had 50% or more of the business.