Hi. Great Question. Here are the rules:
If you reside within the United States (including the District of Columbia, the U.S. Virgin Islands, Puerto Rico, Guam, and the Northern Mariana Islands), you may maintain your Original Medicare, Part A and B.
She may be thinking that you have a Medicare Supplemental Plan:
If you’re enrolled in a Medicare Advantage plan or a Medicare Part D Prescription Drug Plan, a change in residence, such as moving to another state, could qualify you for a Special Election Period (SEP). During your SEP, you’re allowed to enroll into a new plan that is offered in your new service area.
If you decide to permanently move somewhere that’s not covered by your current Medicare plan (that is, outside the plan’s service area), you need to tell your plan immediately.
You can switch to a new Medicare Advantage plan or Medicare Prescription Drug Plan during this period of moving to a different service area. If you prefer, you can return to Original Medicare.