2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Other Forms Of Heart Disease 420-429 > 2006 ICD-9-CM Diagnosis 427 Cardiac dysrhythmias View the most recent version of ICD-9-CM 427 Any variation from the normal rhythm or rate of the heart beat. An abnormal rate of muscle contractions in the heart. 427 is a non-specific code that cannot be used to specify a diagnosis 427 Excludes that complicating: abortion (634-638 with .7, 639.8) ectopic or molar pregnancy (639.8) labor or delivery (668.1, 669.4)