The U.S. Centers for Disease Control and Prevention (CDC) found that 6.7 million U.S. residents under age 65, or about 2.5 percent of the people in that age group, had exchange-based coverage in the last quarter of 2014.
Penetration of Patient Protection and Affordable Care Act (PPACA) exchange coverage was about the same as in the second and third quarters of 2014, and up from 1.4 percent of the under-65 population in the first quarter.
Exchange plans had no enrollees before Jan. 1, 2014.
In the fourth quarter of 2014, exchange plans were covering 1.3 percent of U.S. residents under age 18, 2.5 percent of residents ages 18 to 29, and 3.1 percent of residents ages 30 to 64.
The CDC has reported those figures in a release of data from the National Health Interview Survey (NHIS) series.
See also: CDC: Americans report better care access
The CDC found that the percentage of people under age 65 who were uninsured at the time of the NHIS interview fell to 13.3 percent, from 16.6 percent in 2013, before the PPACA exchange system came to life and some states used PPACA funding to expand their Medicaid programs.