Medicare Enrollment Deadline Calculator
Estimate your Medicare Initial Enrollment Period, possible Special Enrollment Period, and key dates to avoid coverage gaps or late penalties.
Your Information
If your birthday is on the first day of a month, Medicare eligibility is generally treated as the first day of the prior month.
Optional Employer Coverage Dates
Use this if you are retiring after 65 or losing coverage tied to current employment.
For the Part B SEP, Medicare generally uses the earlier of employment ending or group coverage ending.
Estimated Result
Enter your information and calculate your estimate.
Most important date:–
65th Birthday Month–
Medicare Eligibility Month–
Initial Enrollment Starts–
Initial Enrollment Ends–
| Enrollment Period | Estimated Dates |
|---|---|
| Initial Enrollment Period | – |
| Part B Special Enrollment Period | Enter employer coverage dates if applicable |
| General Enrollment Period | January 1 to March 31 each year |
| Medicare Advantage / Part D Annual Enrollment | October 15 to December 7 each year |
| Medigap Open Enrollment | Starts when you are 65 or older and enrolled in Part B, then generally lasts 6 months |
This calculator is for educational purposes only. Medicare enrollment rules can depend on disability, ESRD, Medicaid, employer size, creditable drug coverage, union coverage, Veterans benefits, foreign residence, Railroad Retirement benefits, automatic enrollment, and other special situations. Employer coverage based on current employment is different from COBRA, retiree coverage, marketplace coverage, or other non-current-employment coverage. Confirm your deadlines with Medicare, Social Security, your employer, or a licensed Medicare advisor before making an enrollment decision.
