2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Other Forms Of Heart Disease 420-429 > Conduction Disorders 426.* > 2008 ICD-9-CM Diagnosis 426.4 Right bundle branch block  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 426.4 can be accessed here. 426.4 is a specific code that can be used to specify a diagnosis 426.4 contains 7 index entries View the ICD-9-CM Volume 1 426.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. Index entries containing 426.4: Block bundle branch (complete) (false) (incomplete) 426.50 right 426.4 with left bundle branch block (incomplete) (main stem) 426.53 left fascicular block 426.53 anterior 426.52 posterior 426.51 Wilson's type 426.4 heart 426.9 bundle branch (complete) (false) (incomplete) 426.50 right (see also Block, bundle branch, right) 426.4 intraventricular (diffuse) (myofibrillar) 426.6 bundle branch (complete) (false) (incomplete) 426.50 right (see also Block, bundle branch, right) 426.4 Bundle branch block (complete) (false) (incomplete) 426.50 right (see also Block, bundle branch, right) 426.4 Degeneration, degenerative bundle of His 426.50 right 426.4 Sclerosis, sclerotic bundle of His 426.50 right 426.4