Initial Enrollment Period (IEP)
The Initial Enrollment Period (IEP) is the seven-month window during which a person is first eligible to enroll in Medicare Part B and Part D, spanning the three months before, the month of, and the three months after the month of Medicare eligibility. For Medicare Advantage, the parallel window is the Initial Coverage Election Period.
Definition
The Initial Enrollment Period (IEP) is the seven-month window during which a person is first eligible to enroll in Medicare Part B and Part D, spanning the three months before, the month of, and the three months after the month of Medicare eligibility. For Medicare Advantage, the parallel window is the Initial Coverage Election Period.
Why it matters
Enrolling during the IEP helps beneficiaries avoid late enrollment penalties and coverage gaps.
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