Ambulatory surgical centers
covers the facility service fees related to approved surgical procedures provided in an ambulatory surgical center (facility where surgical procedures are performed, and you’re expected to be released within 24 hours).
You pay the Part B
and 20% of the
to both the ambulatory surgical center and the doctor who treats you. You pay nothing for certain preventive services. You pay all facility charges (sometimes called the "facility fee") for procedures Medicare doesn't cover in ambulatory surgical centers.