Private Health Insurance: Market Concentration in 2024 Was Generally Higher Than in 2011

What GAO Found Since 2014, GAO has reported that enrollment in private health insurance plans has been concentrated, meaning a small number of issuers, such as health insurers, enrolled most of the people in a given market. Specifically, GAO considers a market concentrated in a state if three or fewer issuers hold at least 80 percent of the market share of enrollment. For this report, GAO examined the individual (coverage primarily sold to individuals who lack access to group coverage), small-group (coverage offered by small employers), and large-group (coverage offered by large employers) hea