Medicare Glossary

Definitions for common Medicare terms

Medicare Advantage open enrollment period

DEFINITION: The Medicare Advantage open enrollment period is available starting in 2019. It runs from January 1 to March 31 and allows Medicare Advantage enrollees to either switch to Original Medicare (plus a Part D plan if they want one) or to switch to a different Medicare Advantage plan. Enrollees can only make one such change during the open enrollment period (as opposed to the annual election period in the fall, when people can change their minds multiple times).

Learn more about the Medicare Advantage open enrollment period.