ICD-11 classes
20 Developmental anomalies
Structural developmental anomalies primarily affecting one...
Structural developmental anomalies of the nervous system
LA07 — Structural developmental anomalies of the neurenteric...
LA07.4 — Arnold-Chiari malformation type I

ICD-11 LA07.4 — Arnold-Chiari malformation type I

A condition caused by failure of the cerebellum to correctly develop during the antenatal period. This condition is characterised by extension of the cerebellar tonsils into the foramen magnum, without involving the brain stem. This condition may present as asymptomatic. Confirmation is through observation of the cerebellar tonsil extension by imaging.

The diagnosis includes nothing.

It has no clarifying diagnoses.

The diagnosis is coded elsewhere:

• Structural developmental anomalies of the neurenteric canal, spinal cord or vertebral column #8726