An estimated 28.6 million U.S. residents lacked health insurance when surveyed in 2015, 7.4 million fewer than in 2014, according to a report released today by the Centers for Disease Control and Prevention. The proportion of residents who were uninsured when interviewed for the National Health Interview Survey fell 2.4 percentage points in 2015, to 9.1% from 11.5% in 2014. The uninsured rate for adults under age 65 fell 3.5 percentage points in Medicaid expansion states, compared with 2.1 percentage points in non-expansion states. The report also includes estimates by Health Insurance Marketplace type and for various demographic groups.