ICD-11 classes
11 Diseases of the circulatory system
Cardiac arrhythmia
BC63 — Conduction disorders
BC63.4 — Left bundle branch block
ICD-11 BC63.4 — Left bundle branch block
Disorder of the atrioventricular conduction system in which the QRS duration is greater than or equal to 120 ms in adults, greater than 100 ms in children 4 to 16 years of age, and greater than 90 ms in children less than 4 years of age; there is a QS or rS pattern in lead V1 and a wide slurred R wave in leads I and V6.
The diagnosis includes nothing.
The diagnosis excludes nothing.
Diagnosis with code BC63.4 contains 3 clarifying diagnoses:
- BC63.40 — Left anterior fascicular block
- BC63.41 — Left posterior fascicular block
- BC63.4Z — Left bundle branch block, fascicle unspecified