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initial enrollment period (IEP)

What is Medicare's initial enrollment period?

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Medicare Part D – prescription drug coverage

Medicare Part D – prescription drug coverage

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Medicare’s initial enrollment period (IEP) is the enrollment window when Americans become eligible for Medicare. The period includes the three months prior to the month you qualify for Medicare, plus the month of your eligibility, plus the three months after your Medicare eligibility starts – a total of seven months.

During the IEP, Americans can enroll in Medicare Part A and Part B (together known as Original Medicare), and Part D prescription drug coverage. If you’re eligible for Original Medicare, you have the option of enrolling in Medicare Advantage (Medicare Part C). Here’s how to enroll in the various Medicare plans.

You’ll have an IEP if you’re newly eligible for Medicare for any reason, and get a second IEP if you qualify for Medicare for a second reason. This can happen, for instance, if you first qualify because of a disability and then re-qualify at age 65, or if you’re age 65 or older and develop End Stage Renal Disease (ESRD). If you owe a Medicare Part B or Part D late-enrollment penalty, this will be erased when you re-qualify for Medicare.