Even after you are enrolled in Medicare, one date deserves a spot on your calendar every year: Annual Open Enrollment.
The seven-week window
Each year, from October 15 through December 7, you can switch Medicare Advantage plans or change your Part D drug plan for the coming year.
Why it is worth reviewing annually
Plan costs, drug formularies, and provider networks can all change year to year.
Changes made during this window take effect January 1.