Where used:

Class	MAIN SPECIALTY	references in description MAIN SPECIALTY CODE
Data Element	MAIN SPECIALTY CODE (AUGMENTED CARE PERIOD)	references in description MAIN SPECIALTY CODE
Data Element	MAIN SPECIALTY CODE (MENTAL HEALTH)	references in description MAIN SPECIALTY CODE
Data Element	TREATMENT FUNCTION CODE	references in description MAIN SPECIALTY CODE
Supporting Information	Main Specialty And Treatment Function Codes	references in description MAIN SPECIALTY CODE