G0504 HCPCS - INITIAL OR SUBSEQUENT PSYCHIATRIC COLLABORATIVE CARE MANAGEMENT, EACH ADDITIONAL 30 MINUTES IN A CALENDAR MONTH OF BEHAVIORAL HEALTH CARE MANAGER ACTIVITIES, IN CONSULTATION WITH A PSYCHIATRIC CONSULTANT, AND DIRECTED BY THE TREATING PHYSICIAN OR OTHER QUALIFIED HEALTH CARE PROFESSIONAL (LIST SEPARATELY IN ADDITION TO CODE FOR PRIMARY PROCEDURE); (USE G0504 IN CONJUNCTION WITH G0502, G0503)