Your initial enrollment period is the seven months surrounding your 65th birthday. In this period, you can enroll in Parts A, B, C, and D. Your seven months are:
- The three months before your birthday month.
- The month of your 65th birthday.
- The three months following your 65th birthday month. If you sign up during these last three months, your start date will be delayed one to two months.
If you receive Medicare due to Social Security disability, your Parts A and B automatically start in your 25th month of disability income. The initial enrollment for Parts C and D starts in the 21st month and ends in the 28th month.
Note: If your birthday falls on the first day of a month, you start Medicare a month early. Your enrollment period moves up a month, as well. Example: If your birthday is Jan. 1, you can start Medicare on Dec. 1. You can sign up as early as Sept. 1. See Medicare Deadlines.