Anthem was the largest health insurer by market share in 82 of 389 metropolitan areas examined by the AMA. (Photo: Shutterstock)

A new study from the American Medical Association indicates that the number of metropolitan areas in which there’s little choice of health care insurers is growing.

Healthcare Finance News reports that the 2017 edition of the AMA’s Competition in Health Insurance: A Comprehensive Study of U.S. Markets, which looked at market concentration in 2016, has found that in  43 percent of metropolitan areas (169 out of 389), a single health insurer had captured at least a 50 percent market share—an 8 percent increase in such concentrations in a little over two years.

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