Answer:

In most cases people who are already on a Medigap, Medicare SELECT, or Medicare Advantage plan can freely switch between those three plan types each year during specific enrollment periods.[1]

For example one can switch between Medigap, Medicare SELECT, and Medicare Advantage during the Medicare Advantage Open Enrollment Period (OEP) between January 1 and March 31 and during the Annual Election Period (AEP) between October 15 and December 7.

Citations

  1. Can I Switch Between Medicare Advantage and Medigap? eHealthMedicare.com.

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