HHS reports 12.3 million enrolled by January 31 and 1.9 million fewer were paying premiums March 15.
In previous years many people who initially signed up also wound up dropping out, for a variety of reasons. Some of the main reasons for dropping out include finding job-based insurance, problems paying premiums, and becoming eligible for Medicare.
A new analysis from HHS also found higher dropout rates in areas where insurers have left the program. About one-third of U.S. counties only had one participating insurer this year, and next year there may be areas with no available carrier.
The Obama and Trump administrations emphasize different causes for the annual exodus. Read more in The New York Times