UMLS (HL7) C1547679 Relation/PAR: HL7 Vocabulary Version 2.5
Relation/CHD: A request to add a completed appointment, used to maintain records of completed appointments that did not appear in the schedule (e.g., STAT, walk-in, etc.)
Routine schedule request type - default if not valued
"A request for a tentative (e.g., ""penciled in"") appointment"
;