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Several provisions of the Affordable Care Act (ACA) have improved access to affordable coverage for young adults (19-25). Using data from the National Health Interview Survey, we examine health insurance coverage for young adults from 2009 through the second quarter of 2014. This period captures the expansion of dependent coverage to young adults as well as the 2014 Medicaid expansion and first marketplace open enrollment period. We find that the dependent coverage expansion disproportionately reduced uninsurance among higher income young adults, while the 2014 coverage provisions were associated with substantial reductions in uninsurance among those with low and moderate incomes, particularly in ACA Medicaid expansion states.