While millions of Americans have gained insurance coverage since the Affordable Care Act (ACA) expanded access to health insurance coverage in January 2014, little is known about how access to and affordability of care are changing under the ACA. A new study, being released as a Web First by Health Affairs, found that between September 2013 and March 2015, there was a 3.4 percentage-point increase in the share of nonelderly adults with a connection to a health care system. Among low-income adults targeted by the ACA's Medicaid expansion provision, the increase was 5.2 percentage points.