If you earned Social Security benefits, you can visit or live in most foreign countries and still receive payments.
Don’t know about Medicare.
.
I believe some supplemental plans have coverage for overseas situations.
“Don’t know about Medicare.”
Generally, no. There are some very limited exceptions, such as emergency situations that occur inside the US and its territories, and the nearest medical facility is across the border; or if the emergency takes place on foreign soil while traveling between states or US territories (say, between Washington state and Alaska).