The General Enrollment Period (GEP) is for Medicare-eligible individuals who did not sign up during their Initial Enrollment Period (IEP) which is based on birthdate. The General Enrollment Period is from January 1 – March 31st every year. Your coverage starts the month after you sign up. Unfortunately, most individuals who miss the IEP, who do not qualify for a Special Enrollment Period, and sign up during the General Enrollment Period will face late-enrollment penalties.