One of the good things about working overseas is that many companies, supply medical insurance as a part of the package - no cost to the worker. In addition, usually, all local taxes are paid on behalf of the worker and, if a foreigner, a certificate of local taxes paid, is furnished annually.
A lot of these 'bennies" come about because of local government regulations (Indonesia required the company to be responsible for any "income taxes") and or because of requirement of your clients, nearly all the contracts we worked required that the company have, and demonstrate the existence of, complete medical coverage for their employees for any and all work related injuries/sickness.
On the other hand, no company, that I knew of, supplied insurance for care by the U.S. medical system. In our case we would evacuate you to Singapore. Singapore doctors used to be wholly educated by (usually) either British or U.S. schools. Now they have their own medical schools, but their standards are (I believe) still based on the British standards.
So essentially, if you signed up for a job that paid, say $10 a month, you got the whole $10.