"This factsheet highlights the changes in health insurance coverage after the ACA's enactment in March 2010, for young adults who were able to gain coverage through their parents' health insurance plan, as well as adults who gained coverage after the start of open enrollment for the Health Insurance Marketplaces in October 2013 through September, 2015. Details on people who gained health insurance coverage include race and ethnicity, state Medicaid expansion status, gender, and young adults."