A person who missed the Part B Initial Enrollment Period and has no Special Enrollment Period may enroll during the General Enrollment Period (GEP), which runs:

Why A is correct

The General Enrollment Period is January 1 through March 31 each year, during which people who missed the Initial Enrollment Period and have no Special Enrollment Period may enroll in Part B. Coverage begins on July 1 of that enrollment year, and late enrollment typically triggers the permanent Part B premium penalty of 10% per full 12-month period of delay. The GEP is a tested enrollment-window fact, and it must be kept distinct from the 7-month IEP, the 8-month SEP, and the October-December Annual Election Period used for Part D and Medicare Advantage.

Why the other options are wrong

• B) April through June is not a Part B enrollment window, so this option names dates the program never uses.
• C) October 15 through December 7 is the Annual Election Period for Part C and Part D, not the Part B GEP, so this option transplants the Part D window onto Part B.
• D) The GEP spans three months (January through March), not a single month, so this option understates the length of the window.

Memory hook

Missed both windows? GEP waits in January-March — and the late penalty rides along for life.