a. Medicare only pays for medically necessary ambulance transportation, regardless of 911 dispatch or physician order. Medical necessity is met when the patients’ condition, at the time of transport, is such that transportation by any other means is contraindicated. Non-medically necessary services are the financial responsibility of the patient.
b. Ambulance transportation is a Medicare Part B service. If you only have Medicare Part A, then you are responsible for the cost of the Part B service.