Medicare only covers out of USA emergency care. You would have to pay it here and claim it in the US. This is on a Medicare Advantage Plan, I assume regular Medicare may pay 80%.
But I would not bank on this for sure. What is an emergency or not an emergency?
Medicare Advantage Plan falls under Medigap, not Medicare. Medigap (a supplement to Medicare) may cover healthcare in DR.
According to medicare.gov,
"Medicare may pay for inpatient hospital, doctor, ambulance services, or dialysis you get in a foreign country in these rare cases:
You're in the U.S. when a medical emergency occurs, and the foreign hospital is closer than the nearest U.S. hospital that can treat your medical condition.
You're traveling through Canada without unreasonable delay by the most direct route between Alaska and another state when a medical emergency occurs, and the Canadian hospital is closer than the nearest U.S. hospital that can treat the emergency.
You live in the U.S. and the foreign hospital is closer to your home than the nearest U.S. hospital that can treat your medical condition, regardless of whether an emergency exists.
In some cases, Medicare may cover medically necessary health care services you get on board a ship within the territorial waters adjoining the land areas of the U.S. Medicare won't pay for health care services you get when a ship is more than 6 hours away from a U.S. port.
Medicare drug plans don't cover prescription drugs you buy outside the U.S."