Glossary · Medicare
What is the Initial Enrollment Period (IEP)?
The Initial Enrollment Period is your first chance to sign up for Medicare. It lasts 7 months, starting 3 months before the month you turn 65 and ending 3 months after it.
Definition and figures from Medicare.gov, checked October 23, 2026. This page explains the term; it does not recommend a plan.
Ask how IEP works on your plan
Rivvi explains the term from public CMS, Medicare.gov, and HealthCare.gov sources and works through an example with your numbers.
Expand my textIEP: the facts
| Item | Fact | Source |
|---|---|---|
| Length | 7 months | Medicare.gov: When does Medicare coverage start? |
| Window | 3 months before through 3 months after the month you turn 65 | Medicare.gov: When does Medicare coverage start? |
Compare and look up
- Medicare vs MedicaidSide-by-side comparison
- Medigap vs Medicare AdvantageSide-by-side comparison
Related terms
Questions
What does IEP mean in health insurance?
The Initial Enrollment Period is your first chance to sign up for Medicare. It lasts 7 months, starting 3 months before the month you turn 65 and ending 3 months after it.