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Enrollment in private health insurance plans remained concentrated among a small number of issuers in 2015 and 2016, according to a released last week by the Government Accountability Office. The three largest issuers continued to hold 80 percent or more of the large group, small group and individual market in at least 37 states, GAO found, similar to what the agency previously reported for 2011 through 2014. The Affordable Care Act requires GAO to report on changes in the concentration of enrollment among issuers in overall individual, small group and large group markets, and individual and small group exchanges.