Left posterior fascicular block

This code describes a specific type of intraventricular conduction defect where the electrical impulse through the left posterior fascicle of the left bundle branch is blocked or delayed. This can affect the coordinated contraction of the left ventricle.

Use this code when documentation explicitly states "left posterior fascicular block" or "LPFB" based on electrocardiogram (ECG) findings. It is often identified during routine cardiac evaluations or workups for syncope, palpitations, or dyspnea.

• Ensure the documentation clearly specifies "left posterior" to differentiate from other fascicular blocks.
• Do not confuse with left anterior fascicular block (LAFB) or complete left bundle branch block (LBBB).
• Code any underlying cardiac conditions, such as ischemic heart disease or cardiomyopathy, as additional diagnoses.