When Can I Change Medigap Plans? 
If you have a standardized original Medicare plan like say an `` F '' plan you can change your plan anytime during the calendar year . However , you will be required to go through underwriting to qualify for the new company plan . Medicare Advantage plans are the plans where you are restricted to only change plans during the open enrollment period which for 2014 runs from October 15 to December 7 . 