Table 2 ▪.

Distribution of Diagnoses for Operations with Terminal ICD-9 Codes

			Trauma Surgery
	General Surgery	Neuro- surgery	Total	ICPM GE 5*
Surgical procedures	12,708	8,644	11,280	8,648
Diagnoses	11,868	6,910	10,099	7,627
Different ICD-9 codes	790	266	539	475
Surgical procedures per ICD-9 code:
Median	3	2	4	4
Minimum	1	1	1	1
Maximum	460	1,220	471	296

*The leading 5 of ICPM-GE indicates the chapter on operations.