Your Medigap policy may offer additional coverage for health care services or supplies that you get outside the U.S.
Medigap coverage outside the U.S.
If you have Medigap Plan C, D, E, F, G, H, I, J, M or N, your plan:
Find out before you go
Before you travel outside the U.S., talk with your Medigap plan or
insurance agent to get more information about your Medigap coverage
while traveling.
(source: https://www.medicare.gov/supplements-other-insurance/medigap-travel)
If you do not have a Medigap policy that provides foreign travel emergency coverage (or you have already met your $50,000 lifetime foreign travel emergency coverage limit), you may wish to consider buying a travel insurance policy that includes health coverage -- speak with your travel agent or insurance agent about your options.