Cardiology Coding Alert

Reader Questions:

Reporting Mobitz Block Type I? Do This

Question: My cardiologist documented a diagnosis of Mobitz block type I. Which ICD-10 code should I report?

Texas Subscriber

Answer: You should report I44.1 (Atrioventricular block, second degree) for Mobitz block type I. If you look under included conditions for I44.1, you will see that this code includes types I and II atrioventricular block; types I and II Mobitz block; types I and II second degree block; and Wenckebach’s block.

Condition defined: Heart block or AV block refers to impairment of the electrical signal from the heart’s upper to lower chambers. In a second-degree heart block, some of the signals from the atria don’t reach the ventricles, resulting in a skipped beat (typical of type I) or a slow beat, which may require a pacemaker (typical of type II).