Left bundle branch block

Description

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.

Exclusions from above levels

01 – Certain infectious or parasitic diseases
05 – Endocrine, nutritional or metabolic diseases
18 – Complications of pregnancy, childbirth and the puerperium

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19 – Certain conditions originating in the perinatal period
20 – Congenital malformations, deformations and chromosomal abnormalities
22 – Injury, poisoning or certain other consequences of external causes

Child codes

BC63.40 – Left anterior fascicular block
BC63.41 – Left posterior fascicular block
BC63.4Z – Left bundle branch block, fascicle unspecified

Sibling codes

BC63.0 – Atrioventricular block, first degree
BC63.1 – Atrioventricular block, second degree
BC63.2 – Complete atrioventricular block
BC63.3 – Right bundle branch block
BC63.5 – Nonspecific intraventricular conduction delay
BC63.Y – Other specified conduction disorders
BC63.Z – Conduction disorders, unspecified

Foundation entity

Left bundle branch block – http://id.who.int/icd/entity/1553795531

Allowed postcoordination axes

distribution

Part of: BC63: Conduction disorders › 11: Diseases of the circulatory system