Medicaid is a state-based program so it would probably only work in your home state and if you are eligible and enrolled in the program. Medicare is a federal program and again you have to be eligible and enrolled and I believe that it only applies to healthcare in the US and US territories.
In an emergency the best thing to do is usually to get immediate care at the nearest facility and then get transferred to your preferred facility - after you are stable and able to be transferred. You can argue with your health care insurer about it later.
We have mid-level DAN insurance, and when we take a big vacation we always buy travel insurance and add coverage for "evacuation to a medical facility of your choice" to the policy. I'm very happy to be treated at the nearest facility in an emergency, but later I want to have some choice in the matter.
In an emergency the best thing to do is usually to get immediate care at the nearest facility and then get transferred to your preferred facility - after you are stable and able to be transferred. You can argue with your health care insurer about it later.
We have mid-level DAN insurance, and when we take a big vacation we always buy travel insurance and add coverage for "evacuation to a medical facility of your choice" to the policy. I'm very happy to be treated at the nearest facility in an emergency, but later I want to have some choice in the matter.