Has variation in length of stay in acute hospitals decreased? Analysing trends in the variation in LOS between and within Dutch hospitals

Table 1 Selected diagnoses and medical procedures

Primary diagnosis or medical procedure	ICD-9 code^a	Abbreviation
Femur fracture	820	FEMUR
Cerebrovascular accident	430–434, 436, 437	CVA
Chronic heart failure	428	CHF
Acute Myocardial Infarction plus Unstable Angina	410 + 411.1	AMIplus
Pneumonia	480–486	PNEU
Total hip replacement	-	HIP
Total knee replacement	-	KNEE
Partial resection of the colon (colectomy)	-	RESCOL
Cholecystectomy (bile stones)	-	CHOL

^aThe medical procedures hip replacement, total knee replacement, partial resection of the colon and cholecystectomy were selected using the Dutch classification of procedures

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