Table 2. Procedure codes used to define intensive care treatment during hospital admission, Denmark, 2022–2023 (n = 6 intensive care treatment categories).

ICT category	Procedure code	Procedure name
Intensive care	NABB	Intensive care therapy
	NABE	Intensive care observation
Mechanical ventilation	BGDA0	Mechanical ventilation
	BGFC32	Continuous positive airway pressure treatment
	BGFC33	Continuous positive airway pressure treatment (intermittent)
Ventilation	BGDA1	Non-invasive ventilation
Dialysis	BJFD0	Acute dialysis
ECMO	BGXA2	Extracorporeal membrane oxygenation (ECMO)
Heart treatment	BFHC93	Treatment with vasopressors
	BFHC95	Combination treatment with vasopressors and inotropes

ECMO: extracorporeal membrane oxygenation; ICT: intensive care treatment.