The impact of expanding Medicaid on health insurance coverage and labor market outcomes.

Expansions of public health insurance have the potential to reduce the uninsured rate, but also to reduce coverage through employer-sponsored insurance (ESI), reduce labor supply, and increase job mobility. In January 2014, twenty-five states expanded Medicaid as part of the Affordable Care Act to low-income parents and childless adults. Using data from the 2011-2015 March Current Population Survey Supplements, we compare the changes in insurance coverage and labor market outcomes over time of adults in states that expanded Medicaid and in states that did not. Our estimates suggest that the recent expansion significantly increased Medicaid coverage with little decrease in ESI. Overall, the expansion did not impact labor market outcomes, including labor force participation, employment, and hours worked.