A report from the National Center for Health Statistics indicates that in the first quarter of 2018, 28.3 million (8.8%) individuals of all ages were uninsured at the time of interview—not significantly different from 2017, but 20.3 million fewer than in 2010. Among adults aged 18–64, 12.5% were uninsured at the time of interview, 19.2% had public coverage, and 70.0% had private health insurance coverage.
The report can be obtained at https://www.cdc.gov/nchs/data/nhis/earlyrelease/Insur201808.pdf.