Medicare Supplement Open Enrollment is a one-time opportunity during which you can enroll in any Medicare Supplement plan where you will not have to answer any medical questions. The Medicare Supplement insurance companies cannot turn you down during your personal open enrollment period. Updated for 2020.
However, this period last for only 6 months, unless you have other creditable coverage. It’s not the same as the annual enrollment period (AEP) that runs from October 15th thru December 7th every year, which is a common source of confusion. Open Enrollment dates for Medicare supplements vary for each person.
Your personal Medicare Supplement Open Enrollment period begins on the first day that your Part B becomes effective. If your Medicare Part A and Part B coverage start on February 1st, then your personal enrollment period lasts for exactly 6 months and ends on July 31st.