LA04

ICD-11 MMS 2026-01

Congenital hydrocephalus

Description

A disease caused by failure of the brain to correctly develop during the antenatal period. This condition is characterised by a rapid increase in head circumference or an unusually large head size due to excessive accumulation of cerebrospinal fluid in the brain. This condition may also present with vomiting, sleepiness, irritability, downward deviation of the eyes, or seizures. Confirmation is through observation of cerebrospinal fluid within cerebral ventricles by imaging.

Inclusions

  • Hydrocephalus in newborn

Excludes

  • KA64.0 – Hydrocephalus due to congenital toxoplasmosis
  • LA02.00 – Myelomeningocele with hydrocephalus
  • LA03 – Arnold-Chiari malformation type II
  • LA07.4 – Arnold-Chiari malformation type I

Exclusions from above levels

  • http://id.who.int/icd/entity/733825440 – Inborn errors of metabolism

Child codes

  • LA04.0 – Hydrocephalus with stenosis of the aqueduct of Sylvius
  • LA04.Y – Other specified congenital hydrocephalus
  • LA04.Z – Congenital hydrocephalus, unspecified

Sibling codes

  • LA00 – Anencephaly or similar anomalies
  • LA01 – Cephalocele
  • LA02 – Spina bifida
  • LA03 – Arnold-Chiari malformation type II
  • LA05 – Cerebral structural developmental anomalies
  • LA06 – Cerebellar structural developmental anomalies
  • LA07 – Structural developmental anomalies of the neurenteric canal, spinal cord or vertebral column
  • LA0Y – Other specified structural developmental anomalies of the nervous system
  • LA0Z – Structural developmental anomalies of the nervous system, unspecified

Foundation entity

Congenital hydrocephalus – http://id.who.int/icd/entity/1878746673

Part of: 20: Developmental anomalies