Medicare Initial Enrollment Period Calculator
Turning 65 and not sure when you can sign up for Medicare? Use this free Initial Enrollment Period calculator to find your exact 7-month enrollment window.
Just enter your date of birth on the left, and you’ll instantly see the start and end dates of your Medicare IEP — so you can enroll on time and avoid costly late penalties.
How the Medicare Initial Enrollment Period Works
Your Initial Enrollment Period (IEP) is the first opportunity you have to enroll in Medicare Part A (hospital insurance) and Part B (medical insurance). It’s a 7-month window built around the month you turn 65:
3 months before your 65th birthday month
Your birthday month itself
3 months after your 65th birthday month
For example, if you turn 65 on August 15, your IEP runs from May 1 through November 30. This is the ideal time to sign up — enrolling during your IEP means your coverage starts as early as possible with no penalties.
Here’s a big heads-up for Medicare beneficiaries born on the first of the month. You must pay close attention to this calculator. If your 65th birthday falls on the first day of a month, Medicare treats it as though your birthday is the previous month. Without planning, you could accidentally miss your Medicare IEP enrollment window.
*This tool is an estimate only and may not be exact.
Initial Enrollment Period Explained
Your initial enrollment period (IEP) is the window of time in which you can sign up for Medicare Part A and Part B. The IEP is a 7-month period around your 65th birthday month.