What if I move out of my Medicare plan's service area? - Medicare and You Handbook - A Guide to Medicare

What if I move out of my Medicare plan's service area?
You can call the plan to see if you can stay in the Medicare plan. If you must switch to another Medicare plan, follow the instructions under How do I switch my Medicare Advantage Plan
or Medicare Prescription Drug Plan?. Your choices may include joining

another Medicare Advantage Plan if one is available in your new area, or
the Original Medicare Plan, and you will have the right to join a stand-alone Medicare Prescription Drug Plan (Part D), and/or buy a Medigap Policy to fill the gaps in Original Medicare Plan coverage (see Buying a Medigap (Medicare Supplement Insurance) Policy), or
another Medicare Prescription Drug Plan.

(Primary Source: Centers for Medicare and Medicaid Services - Medicare and You Handbook. This content may have been enhanced by this site to include further examples, explanations, and links.)