Left bundle branch hemiblock

This code represents a conduction disturbance within the left bundle branch of the heart's electrical system, specifically affecting one of its fascicles (anterior or posterior). This results in a characteristic pattern on an electrocardiogram (ECG) indicating delayed activation of a portion of the left ventricle. It is a type of intraventricular block.

Use this code when documentation explicitly states "left bundle branch hemiblock" or "left anterior fascicular block (LAFB)" or "left posterior fascicular block (LPFB)." This diagnosis is typically made based on ECG findings. It is often an incidental finding but can be associated with underlying cardiac conditions.

• Differentiate from complete left bundle branch block (LBBB) or right bundle branch block (RBBB).
• Ensure the documentation specifies "hemiblock" or "fascicular block" of the left bundle.
• Consider co-occurring cardiac conditions that may be the underlying cause and code them appropriately.