The epidemiology, risk factors, and impact on hospital mortality of status epilepticus after subdural hematoma in the United States

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Table 1 The ICD-9-CM classification of study cohort

ICD9-CM code	Description	References
432.1, 852.2, 852.3	Subdural-hematoma	(11, 17, 41, 43)
518.5, 518.82	Grand Mal Status
96.70, 96.71, 96.72
458.0, 458.8, 458.9, 796.3, 785.51, 785.59	Cardiovascular dysfunction, hypotension, shock	-27
286.2, 286.6, 286.9, 287.3-5	Hematological dysfunction, disseminated intravascular coagulation, purpura fulminans, coagulopathy, thrombocytopenia	-27
570, 572.2, 573.3	Hepatic dysfunction, acute hepatic failure, hepatic encephalopathy, hepatitis	-27
584, 580, 585, 39.95	Renal dysfunction, acute renal failure, acute glomerulonephritis, renal shutdown, hemodialysis	-27
293, 348.1, 348.3, 780.01, 780.09, 89.14	Neurological dysfunction, transient organic psychosis, anoxic brain injury, encephalopathy, coma. altered consciousness, electroencephalography	-27
	Comorbidities (Charlson et al.1987)	(13, 27, 30)
428.0-428.9	Congestive heart failure
401	Hypertension
249, 250	Diabetes mellitus
491, 492, 496	COPD
571	Chronic liver failure
585, 586	Chronic kidney disease
196, 199	Cancer