Enough states have reported Medicaid tallies through February to posit that the pandemic has increased enrollment by more than ten million nationally since February 2020. Adjusting for the usual difference* between CMS's official totals (now posted through November**) and my sample below (based on state monthly reports), year-over-year enrollment growth since February 2020 is likely about 14.8%, and total enrollment likely stands at about 81.7 million. A quarter of the U.S. population is enrolled in Medicaid.
I don't think we've fully fathomed the effect on access to health insurance of the pandemic, the battered and flawed but still functioning and funded ACA programs in place as the pandemic hit, and pandemic relief measures. Consider...
The Families First Act effectively required states to pause Medicaid disenrollments for the duration of the Covid-19 emergency, and enrollment will continue to grow until that moratorium ends.*** Enrollment growth among those rendered eligible by the ACA Medicaid expansion is close to 30%. In the ACA marketplace, average monthly enrollment in 2021 will probably exceed 2019 enrollment by at least a million, perhaps more, spurred by extended Special Enrollment Periods and subsidies enhanced by the American Rescue Plan Act. As the population ages, Medicare enrollment grows by about 1.5 million yearly. Meanwhile, the huge job losses triggered by the pandemic appear to have had only a modest effect on employer-sponsored insurance: enrollment through September was down by just 2-3 million, according to a KFF estimate.

