You are correct in both posts. He will not give up Medicare but Medicare is only good in the USA. And if the father comes here and he has to be admitted in a private hospital there will be considerable costs, even here in Argentina. There will be limits on how much insurance will pay (and it might be difficult to get a policy for someone in their 80s).Though "this person" will still be covered by Medicare insurance in the USA, no medical procedures performed outside the USA will be paid for by Medicare. In other words, if you move, you lose.