Table 1.

ICD-9CM Codes Used to Define Operative Cohorts

Operative Cohort	ICD-9CM Procedure Code	Description
Open Colectomy	45.71	Open and other multiple segmental resection of large intestine
	45.73	Open and other right hemicolectomy
	45.74	Open and other transverse colectomy
	45.75	Open and other left hemicolectomy
	45.76	Open and other sigmoidectomy
	45.79	Other and unspecified partial excision of large intestine
	45.82	Open total intra-abdominal colectomy
	45.83	Other and unspecified total intra-abdominal colectomy
Coronary Artery Bypass Grafting	36.10	Aortocoronary bypass not otherwise specified
	36.11	Aortocoronary bypass 1-artery
	36.12	Aortocoronary bypass 2-artery
	36.13	Aortocoronary bypass 3-artery
	36.14	Aortocoronary bypass 4-artery
	36.15	1 internal mammary coronary artery bypass grafting
	36.16	2 internal mammary coronary artery bypass grafting
	36.17	Abdominal-coronary artery bypass
	36.19	Heart revasc bypass anast necrosis
Hip Fracture Repair	79.00	Closed reduction of fracture without internal fixation, unspecified site
	79.05	Closed reduction of fracture without internal fixation, femur
	79.10	Closed reduction of fracture with internal fixation, unspecified site
	79.15	Closed reduction of fracture with internal fixation, femur
	79.20	Open reduction of fracture without internal fixation, unspecified site
	79.25	Open reduction of fracture without internal fixation, femur
	79.30	Open reduction of fracture with internal fixation, unspecified site
	79.35	Open reduction of fracture with internal fixation, femur
	79.40	Closed reduction of separated epiphysis, unspecified site
	79.45	Closed reduction of separated epiphysis, femur
	79.50	Open reduction of separated epiphysis, unspecified site
	79.55	Open reduction of separated epiphysis, femur