The number of seniors who switched from traditional Medicare to Medicare Advantage increased annually from 2016 to 2020, according to new research published in JAMA Health Forum. The switch rate from traditional Medicare to MA grew to 6.8% in 2020 — more than three times higher than the switch rate from MA to traditional Medicare. This trend was noticed across populations with a variety of traits, including age, race and mortality status, and was particularly strong among Medicare-Medicaid dual eligibles. Switch rates from MA to traditional Medicare, meanwhile, are largely on the decline, but still more common among duals than non-duals. The study’s authors suggested this movement was a contributor to overall MA growth, noting that MA’s share of Medicare enrollment is projected to exceed 50% this year. They also observed that switching accounted for a growing share of new MA enrollment growth, rising from 49% in 2016 to 67% in 2020.