A substantial body of research has investigated effects of the Medicaid expansion under the Affordable Care Act (ACA) on coverage; access to care, utilization, affordability, and health outcomes; and various economic measures. This issue brief summarizes findings from 202 studies of the impact of state Medicaid expansions under the ACA published beginning in January 2014 (when the coverage provisions of the ACA went into effect) and updates earlier versions of this brief with studies through February 2018.1 More recent studies continue to support earlier findings but provide additional findings in key areas, including expansion's effects on health outcomes, access to services and medications for behavioral health and other needs, and providers' financial stability.
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