ICD-11 classes
11 Diseases of the circulatory system
Cardiac arrhythmia
BC63 — Conduction disorders
BC63.4 — Left bundle branch block
BC63.40 — Left anterior fascicular block

ICD-11 BC63.40 — Left anterior fascicular block

Disorder of the atrioventricular conduction system characterised by left axis deviation for age (frontal plane axis between -45° and -90°), qR pattern in lead aVL, R-peak time in lead aVL of 45 ms or more, and a QRS duration that does not meet age dependent criteria for complete bundle branch block (less than 120 ms in adults, less than 100 ms in children 4 to 16 years of age, and less than 90 ms in children less than 4 years of age)

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.