MODERATE SEDATION SERVICES PROVIDED BY THE SAME PHYSICIAN OR OTHER QUALIFIED HEALTH CARE PROFESSIONAL PERFORMING THE DIAGNOSTIC OR THERAPEUTIC SERVICE THAT THE SEDATION SUPPORTS, REQUIRING THE PRESENCE OF AN INDEPENDENT TRAINED OBSERVER TO ASSIST IN THE MONITORING OF THE PATIENT'S LEVEL OF CONSCIOUSNESS AND PHYSIOLOGICAL STATUS; EACH ADDITIONAL 15 MINUTES INTRASERVICE TIME (LIST SEPARATELY IN ADDITION TO CODE FOR PRIMARY SERVICE)