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see 6/18/21 update at bottom
Charles Gaba estimates current enrollment in the ACA marketplace at 12.4 million. That's based on effectuated enrollment as of February of 11.3 million, plus about 1.6 million new enrollments during the emergency Special Enrollment Period (SEP) commenced on Feb. 15, minus an estimate of monthly attrition based on last year's monthly totals. Attrition may be a bit higher, but this is a good estimate.
A lot of people who pay attention to marketplace enrollment patterns have imprinted a number: 12.7 million. That was the (rounded) national total of signups for coverage as of the end of Open Enrollment season (OE) in 2016 -- long understood to be the peak year for marketplace enrollment. Plan selections declined in subsequent years, probably due in part both to soaring premiums in 2017 and 2018 and Trump administration sabotage (which contributed to 2018 premium hikes though not to the correction of 2017).
Plan selections as of the end of OE is a very different metric, however, from effectuated enrollment, which measures people who are paid up on their premiums. Attrition was high in 2016: effectuated enrollment peaked at 10.8 million in March, and average monthly enrollment for the year was 10.0 million. Attrition fell in the Trump years, for reasons we'll touch on below, and fell further last year, as the pandemic triggered high SEP enrollment.
This year, the emergency SEP, coupled with massive boosts to premium subsidies enacted in the American Rescue Plan, has triggered SEP enrollment that's 3.5 times higher than in 2019, the last pre-pandemic year. The SEP enrollments logged to date have almost certainly outpaced normal attrition as experienced in the pre-pandemic years. The ARP subsidy boosts have likely reduced disenrollments as well as stimulating new enrollment.
Bottom line: marketplace enrollment growth is larger than meets the eye, at least for those who measure "12.4 million" against the 2016 end-of-OE peak. June enrollment as estimated by Gaba is 20% higher than June enrollment in 2016, and 19% higher than in June 2020, when SEPs triggered by the pandemic pushed mid-year enrollment to a new high.