Unexpected medical situations can arise anytime. Overseas visitors should acquire travel insurance that covers medical situations in the US, where care for uninsured patients can be very expensive. The system in the United States is mostly private, and your country’s health insurance card is not valid. Foreign visitors without travel health insurance will have to pay out of pocket for their medical treatment. If you do not have medical insurance and you receive emergency care, the bill will be sent to your home country address.