2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Other Forms Of Heart Disease 420-429 > Cardiac Dysrhythmias 427.* > 2006 ICD-9-CM Diagnosis 427.31 Atrial fibrillation View the most recent version of ICD-9-CM 427.31 Disorder of cardiac rhythm characterized by rapid, irregular atrial impulses and ineffective atrial contractions. 427.31 is a specific code that can be used to specify a diagnosis 427.31 contains 2 index entries View the ICD-9-CM Volume 1 427.* hierarchy  Index entries containing 427.31: Fibrillation atrial (established) (paroxysmal) 427.31 auricular (atrial) (established) 427.31