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 426.11 First degree atrioventricular block View the most recent version of ICD-9-CM 426.11 426.11 is a specific code that can be used to specify a diagnosis 426.11 contains 3 index entries View the ICD-9-CM Volume 1 426.* hierarchy Alternate Terminology Incomplete atrioventricular block, first degree Prolonged P-R interval NOS  Index entries containing 426.11: Block atrioventricular (AV) (incomplete) (partial) 426.10 first degree (incomplete) 426.11 heart 426.9 first degree (atrioventricular) 426.11 Prolonged, prolongation PR interval 426.11