NO!
The Social Security Medicare Program does NOT cover hospital or medical services outside the United States.
The Department of Veterans Affairs will only pay for hospital and medical service outside the United States under very limited circumstances.
When considering medical insurance, first find out how citizens of the country where you will reside pay their medical bills and if the same coverage is available to resident foreigners.
http://travel.state.gov/travel/tips/brochures/brochures_1215.html
The U.S. government does not pay for hospital or medical services for Americans overseas and will not pay to evacuate you for treatment in the United States.