Medical Expense✓ Verified · outline & fact-checked · Sep 2026Difficulty 2/5
The Medicare General Enrollment Period for Part B runs each year from:
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Answer & full 3-part explanation (select an option above, or peek)
Why A is correct
Beneficiaries who miss their Initial Enrollment Period for Part B can enroll during the General Enrollment Period (GEP), which runs from January 1 through March 31 each year, with coverage beginning the following month. Enrolling during the GEP typically triggers the Part B late-enrollment penalty because the beneficiary waited beyond the IEP without qualifying coverage. The GEP window is a distinct enrollment fact tested under AH-III.D.1b, which also covers the 7-month IEP and the 8-month SEP.
Why the other options are wrong
- B) October 15 through December 7 is the Annual Election Period for Medicare Advantage and Part D, not the Part B GEP.
- C) April through June is not an open Medicare enrollment window.
- D) July through September is not the General Enrollment Period.
Memory hook
Missed your window? GEP opens January 1 and closes March 31.