For the states using healthcare.gov, only 4.2 million of the 8.8 million 2015 enrollees were enrolled at the end of 2014. After Obamacare’s first open season closed, the administration reported that 5.4 million of the 8.1 million enrollees had signed up through healthcare.gov (Table 1). (That figure was later revealed as somewhat contaminated by the inclusion of standalone dental plans.).
So, over one fifth of those who were enrolled by April 2014 had vanished from Obamacare by February 2015. Maybe some of them did re-enroll for 2015: Someone could have signed up in April 2014, dropped out during 2014 and signed up again this time around. This fragmentation of coverage in working and lower middle-class households is surely frustrating to them and harms the quality of care.
via Obamacare’s Second Open Season: Average Premium Up 23 Percent – After Subsidies | Health Policy Blog | NCPA.org.