According to a 2018 Census report on health coverage, for all ages and all insurance types: in 2018, 8.5% of people, or 27.5 million, did not have health insurance at any point during the year. That number increased from 2017’s 7.9%, or 25.6 million.
In other words, more Americans, about 0.6% more, went without health insurance at some point during the year.
Notably health insurance when recorded by the Census counts all private and public insurance types.
For more details, see the 2018 Census report on health coverage.
TIP: According to Gallup data, the uninsured rate under the Affordable Care Act (ObamaCare) for 18 – 64 only dropped to record lows of 10.9% in 2016 but has since risen to 13.7% in 2019. The Gallup data suggests that the rate has grown in 2019 to a degree not illustrated by the Census report. However one should note the Gallup report is based on a smaller and different sample size than the Census.
TIP: The above data can be compared to 8.8%, or 28.1 million, for 2016; and to 91.%, or 29 million, for 2015 (see the 2016 report for that data).