LB73.22

ICD-11 MMS 2026-01

Atlanto-axial instability or subluxation

Description

A condition caused by bony or ligamentous abnormality of the upper spinal column. This condition is characterised by excessive movement at the junction between C1 and C2 vertebrae. This condition may present with impaired rotation of the neck, neurological difficulties, or may be asymptomatic.

Index terms

  • Atlanto-axial instability or subluxation

Exclusions from above levels

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

Sibling codes

  • LB73.20 – Klippel-Feil anomaly
  • LB73.21 – Occipitalisation of atlas
  • LB73.23 – Aplasia or hypoplasia of the odontoid process of axis
  • LB73.24 – Segmentation anomalies of vertebrae
  • LB73.25 – Congenital scoliosis due to congenital bony malformation
  • LB73.26 – Sacralisation of the last lumbar vertebra
  • LB73.27 – Lumbarisation of the first sacral vertebra
  • LB73.28 – Sacrum agenesis or hypoplasia
  • LB73.29 – Caudal appendage
  • LB73.2A – Congenital spondylolisthesis
  • LB73.2Y – Other specified structural developmental anomalies of spine
  • LB73.2Z – Structural developmental anomalies of spine, unspecified

Foundation entity

Atlanto-axial instability or subluxation – http://id.who.int/icd/entity/135548078

Allowed postcoordination axes

Part of: LB73.2: Structural developmental anomalies of spine › LB73: Structural developmental anomalies of spine or bony thorax › 20: Developmental anomalies