Who can join a Medicare Advantage Plan (like an HMO or PPO)?
You can generally join a Medicare Advantage Plan if
you live in the service area of the plan you want to join. In a Medicare HMO, the service area is usually where you get services from the plan. The plan can give you more information about its service area. If you live in another state for part of the year, check to see if the plan will cover you there.
you have Medicare Part A and Part B. However, if you are already in a Medicare Advantage Plan and have only Part B, you may stay in your plan.