The GAO used enrollment data from 2015-16 that health insurers reported to CMS, and compared the data to 2011-14 enrollment figures. Some data sets also included other state and federal numbers.
In at least 37 of 51 states, the three biggest payers held 80 percent of the market, which includes large and small group employers, as well as the individual market. GAO reported similar numbers for 2011-14.
For the full report, click here.
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