LA05.5

ICD-11 MMS 2026-01

Abnormal neuronal migration

Description

Any condition caused by abnormal migration of neuronal cells during the antenatal period. These conditions may present with poor muscle tone and motor function, seizures, developmental delays, mental retardation, failure to grow and thrive, difficulties with feeding, swelling in the extremities or microcephaly.

Excludes

Exclusions from above levels

  • LA01 – Encephalocele
  • http://id.who.int/icd/entity/733825440 – Inborn errors of metabolism

Child codes

  • LA05.50 – Polymicrogyria
  • LA05.51 – Cortical dysplasia
  • LA05.5Y – Other specified abnormal neuronal migration
  • LA05.5Z – Abnormal neuronal migration, unspecified

Sibling codes

  • LA05.0 – Microcephaly
  • LA05.1 – Megalencephaly
  • LA05.2 – Holoprosencephaly
  • LA05.3 – Corpus callosum agenesis
  • LA05.4 – Arrhinencephaly
  • LA05.6 – Encephaloclastic disorders
  • LA05.7 – Brain cystic malformations
  • LA05.8 – Colpocephaly
  • LA05.Y – Other specified cerebral structural developmental anomalies
  • LA05.Z – Cerebral structural developmental anomalies, unspecified

Foundation entity

Abnormal neuronal migration – http://id.who.int/icd/entity/810833887

Part of: LA05: Cerebral structural developmental anomalies › 20: Developmental anomalies