Requires the Secretary to revise any regulations establishing conditions of Medicare participation for hospitals and ambulatory surgical centers relating to anesthesia services to provide that nurse anesthetists may furnish such services under: (1) the medical direction of an immediately available anesthesiologist; (2) the supervision of an immediately available physician; or (3) a written collaboration agreement with an immediately available physician or physician group experienced in anesthesia administration and credentialed by the hospital and ambulatory surgical center to participate in such collaboration.