Other Medicare enrollment periods you should be aware of include:

Medigap Open Enrollment Period – This is a six-month period that starts as soon as you have Medicare Part B and are 65. This period will allow you to buy any Medicare Supplement (Medigap) plan, regardless of your health. If you choose not to take advantage of this enrollment period, you may be charged more in premiums or you may not be able to buy a Medigap plan.

Medicare Advantage Open Enrollment Period – This period begins on January 1 and ends March 31. This period will allow you to switch from one Medicare Advantage plan to another, with or without prescription drug coverage. It will also allow you to go back to Original Medicare and join a Part D plan.