This value set includes codes based on the following rules:

• Include these codes as defined in http://dicom.nema.org/resources/ontology/DCM

  Code	Display	Definition
  109125	At last appointment	The occasion on which a procedure was performed at the most recent outpatient visit.
  109122	On discharge from unit	The occasion on which a procedure was performed on discharge from a specialist unit.
  109121	On discharge	The occasion on which a procedure was performed on discharge from hospital as an in-patient.
  109124	Post-intervention	The occasion on which a procedure was performed immediately after to non-surgical intervention. E.g, percutaneous angioplasty, biopsy.
  109123	Pre-intervention	The occasion on which a procedure was performed immediately prior to non-surgical intervention. E.g, percutaneous angioplasty, biopsy.
  109120	On admission to unit	The occasion on which a procedure was performed on admission to a specialist unit.

• Include these codes as defined in http://snomed.info/sct

  Code	Display
  277671009	Intraoperative
  262068006	Pre-operative
  278307001	On admission
  281379000	Pre-admission
  255235001	Pre-dose
  262061000	Post-operative
  255566006	Post-dose