Always start with a review of what insurance coverage you already have through your health insurance or credit card. No need to pay for double coverage.
My group health insurance always covered medical care overseas, and I was happy to discover when I went on Medicare last month, that while Medicare will NOT cover you outside the U.S., my Medicare supplement will. As someone in the insurance industry said, people forget that medical care is generally cheaper outside the U.S., so to save money, many insurance providers will pay for care outside the U.S.