“Compared to 2010, when the ACA became law, fewer people today are uninsured, but more people are underinsured. Of the 194 million U.S. adults ages 19 to 64 in 2018, an estimated 87 million, or 45 percent, were inadequately insured (see Tables 1 and 2).
Despite actions by the Trump administration and Congress to weaken the ACA, our survey found no statistically significant change in the adult uninsured rate by late 2018 compared to 2016 (Table 3). This finding is consistent with recent federal surveys, but other private surveys (including other Commonwealth Fund surveys) have found small increases in uninsured rates since 2016 (see “Changes in U.S. Uninsured Rates Since 2013”).”
Health Insurance Coverage Eight Years After the ACA, Sara R. Collins, Herman K. Bhupal, and Michelle M. Doty, Commonwealth Fund, February 7, 2019