Medicare Part A (Hospital Insurance) covers anesthesia services if you’re an inpatient in a hospital.
Medicare Part B (Medical Insurance) covers anesthesia services if you’re an outpatient in a hospital or a patient in a freestanding ambulatory surgical center .
Your costs in Original Medicare
After you meet the Part B deductible , you pay 20% of the Medicare-Approved Amount for the anesthesia services you get from a doctor or certified registered nurse anesthetist. The anesthesia service must be associated with the underlying medical or surgical service. You may have to pay an additional copayment to the facility.