In those places, you can probably get better care outside prison.

Even if you're as a tourist or immigrant?

There was an article recently on HN where a British citizen was shipped home for surgery instead of getting it done in Singapore by their travel insurance company.

Would they get the surgery as a foreigner in prison?

You’d definitely get better care in the US by going on Medicaid. If you’ve worked enough to qualify for SSI (10 years), you’d be covered by Medicare!