2006 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.* > 2006 ICD-9-CM Diagnosis 426.5 Bundle branch block other and unspecified View the most recent version of ICD-9-CM 426.5 426.5 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 426.* hierarchy