The Medicare Advantage Open Enrollment Period (MA OEP) is the time when you can switch from one Medicare Advantage Plan to another, or switch from a Medicare Advantage Plan to Original Medicare with or without a Part D plan. The MA OEP occurs each year from January 1 through March 31, and changes take effect on the first of the month following the month you enroll. You can only make one change during the MA OEP.

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