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Medical ExpenseVerified · outline & fact-checked · Sep 2026Difficulty 1/5

A beneficiary who missed the initial enrollment period for Medicare Part B and has no other qualifying coverage may enroll during the general enrollment period, which runs:

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Answer & full 3-part explanation (select an option above, or peek)

Why A is correct

The Medicare Part B general enrollment period (GEP) runs from January 1 through March 31 each year for individuals who did not enroll during their initial enrollment period and do not qualify for a special enrollment period. Coverage purchased during the GEP generally begins the following month, and the beneficiary is subject to the late enrollment penalty for each 12-month period of delay. The GEP is distinct from the initial enrollment period around the 65th birthday and from the fall open enrollment period used for Medicare Advantage and Part D plan changes, which is October 15 through December 7.

Why the other options are wrong

  • B) October 15 through December 7 is the annual open enrollment period for Medicare Advantage and Part D plan changes, not the Part B GEP.
  • C) The 7-month window around the 65th birthday is the initial enrollment period, not the annual general enrollment period.
  • D) July 1 through September 30 is not a Medicare Part B enrollment window under the statute.

Memory hook

Missed your window? Part B's second chance opens January 1 and closes March 31.

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