Table 1. International Classification of Disease, Ninth Clinical Modification (ICD-9-CM) and Clinical Classifications Software (CCS) codes used to identify subtypes of arrhythmias and epilepsy.

Abbreviations: ICD-9= International Classification of Disease, Ninth Revision, CCS= Clinical Classifications Software.

Condition	Source	Codes
Atrial fibrillation (AF)	ICD-9	427.31
Atrial flutter (Afl)	ICD-9	427.32
Wolff-Parkinson-White syndrome (WPW)	ICD-9	426.7
Nonparoxysmal atrioventricular (AV) nodal tachycardia	ICD-9	426.89
Paroxysmal supraventricular tachycardia (PSVT)	ICD-9	427.0
Paroxysmal ventricular tachycardia (VT)	ICD-9	427.1
Ventricular premature beats	ICD-9	427.69
Ventricular fibrillation (VF)	ICD-9	427.41
Ventricular flutter (Vfl)	ICD-9	427.42
Sudden Cardiac Arrest (SCA)	ICD-9	427.5
Premature atrial/ventricular complexes (PAC/PVC)	ICD-9	427.60, 427.61, 427.69
Sinoatrial (SA) node dysfunction	ICD-9	427.81
Bundle branch block (BBB)	ICD-9	426.2, 426.3, 426.4, 426.50, 426.51, 426.52, 426.53, 426.54
Atrioventricular (AV) blocks	ICD-9	426.0, 426.10, 426.11, 426.12, 426.13
Other, unspecified	ICD-9	427.2, 427.9, 427.89, 785.0
Epilepsy	CCS	83