Source: Stacey McMorrow, Genevieve M. Kenney, Sharon K. Long and Nathaniel Anderson, Health Affairs, Vol. 34 no. 4, April 2015
From the abstract:
The Affordable Care Act provision allowing young adults to remain on a parent’s private insurance plan until age twenty-six disproportionately reduced uninsurance among higher-income young adults, while the 2014 coverage provisions were associated with substantial reductions for those with low and moderate incomes, particularly in Medicaid expansion states. About 20 percent of young adults remained uninsured in early 2014.