Table ta.

International classification of diseases, 9th revision (ICD-9) codes used to define inpatient diseases and related procedures

Disease	Diagnosis or procedure	ICD-9 code
Giant cell arteritis	Giant cell arteritis	446.5
	Polymyalgia rheumatica*	725
Osteoarthritis	Osteoarthritis	715
Coronary artery disease	Angina	413, 414.0
	Myocardial infarction	410, 411
	Coronary angioplasty or coronary stent insertion or coronary artery bypass grafting	36.0, 36.1, 36.2, 36.3
Stroke	Stroke	433, 434, 437.0, 437.1
	Cerebrovascular accident and atherosclerosis	437.0, 437.1
	Carotid endarterectomy	38.11, 38.12
Peripheral arterial disease	Peripheral vascular bypass or peripheral artery endarterectomy	38.18, 38.48, 39.24, 39.25, 39.26, 39.29, 39.5
	Atherosclerosis of aorta	440.0
	Atherosclerosis of peripheral arteries	440.2
	Arterial embolism and thrombosis	444
Aortic aneurysm or dissection	Aortic aneurysm or dissection	441
	Peripheral vascular disease, unspecified	443.9
	Repair of aortic aneurysm	38.44, 38.45, 39.54

* Considered in the exclusion of patients within the 36 month period before study entry but not used to define the cohort with giant cell arteritis.