An estimated 28.4 million U.S. residents, or 8.9%, lacked health insurance when surveyed in the first six months of 2016, according to a report released yesterday by the Centers for Disease Control and Prevention. That’s essentially the same as in 2015, but 20.2 million fewer people than in 2010, the authors said. The uninsured rate for adults under age 65 was 8.1% in Medicaid expansion states, compared with 14.2% in non-expansion states. The report also includes estimates by Health Insurance Marketplace type and for various demographic groups.