What Is The Medigap Open Enrollment Period? 
Other than your initial enrollment period , Medigap does not have an open enrollment period . For most people , when they turn age 65 and sign up for Medicare Part B , their initial enrollment period starts . During that 6 month period you can sign up for any Medicare supplement plan without providing evidence of insurability . But you are allowed to buy or change your Medigap plan at any time of the year . 