Free tool
Medicare enrollment window checker
Enter your date of birth and this works out every date that matters: the seven months of your Initial Enrollment Period, when coverage would start if you apply in each of them, and the six-month Medigap window that only opens once.
Work out your Medicare dates
Enter your date of birth. Everything below is calculated from it — nothing is sent anywhere, and no email address is required.
What this tool cannot do
- It assumes eligibility at 65 through age, not through disability or ESRD
- It cannot tell you whether your employer coverage is creditable — that needs a conversation
- It does not account for state-specific Medigap rules, which differ from the federal default
- It calculates dates only; it does not tell you which plan is right for you
Calculators are for orientation. Before you act on a number, have a licensed person check it against your actual situation — that part is free.
Questions about this tool
What if my birthday is on the first of the month?
If you were born on the first day of a month, Medicare treats you as though you turned 65 in the previous month, which shifts your entire Initial Enrollment Period one month earlier. The checker applies this rule automatically.
What happens if I miss my Initial Enrollment Period?
Without creditable employer coverage you would generally wait for the General Enrollment Period and pick up a lifetime Part B premium penalty for each full twelve months you were eligible and not enrolled. If you think you have missed a deadline, call us — there may be a Special Enrollment Period that applies.
Why does the Medigap window matter so much?
During your six-month Medigap Open Enrollment Period, a supplement carrier must issue you any policy it offers regardless of your health. Once it closes, in most states the carrier can underwrite you and decline. It is the least reversible window in the whole Medicare timeline.