1. Supportive professional services other than room, board, and routine hospital services that are incidental to the hospital stay and provided by the facility such as ambulance, anesthesia, blood administration, drugs, laboratory tests, pharmacy, operating room, x-rays, medical, surgical, and central supplies; physical, occupational, and speech therapy; and inhalation therapies. Also called inpatient ancillary services. 2. In a medical office setting, ancillary medical services may consist of diagnostic tests such as x-rays or laboratory tests.

Payment formula is performed by taking the base anesthesia procedure units and adding them to the time reported, as well as units for physical status modifiers, qualifying circumstances, and any other allowed units or charges. This sum is multiplied by a conversion factor.

Division of the Current Procedural Terminology (CPT) code book that contains information about anesthesia services.

Surgical time period during a procedure in which an anesthesiologist and anesthetist, or both, participate. The elapsed time is documented and begins when the anesthesiologist prepares the patient for the operation and ends when the patient is taken to the hospital recovery room. Also called anesthesia minutes of service.

Doctor of Medicine (MD) who specializes in anesthesiology, the medical specialty concerned with the pharmacological, physiological, and clinical aspects of anesthesia and related fields.

Study of the administration of anesthesia drugs or gas to produce nerve blocks or loss of sensation in a patient.

Individual who administers anesthesia drugs or gas to a patient before or during an operative procedure.