LB73.12

ICD-11 MMS 2026-01

Accessory rib

Description

A condition caused by failure of the ribs to correctly develop during the antenatal period. This condition is characterised by a supernumerary rib arising from a cervical or lumbar vertebra. This condition may present with thoracic outlet syndrome, or may be asymptomatic.

Index terms

  • Accessory rib
  • extra rib
  • supernumerary rib

Exclusions from above levels

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

Sibling codes

  • LB73.10 – Poland syndrome
  • LB73.11 – Bifid rib
  • LB73.13 – Structural developmental anomalies of sternum
  • LB73.1Y – Other specified structural developmental anomalies of chest wall
  • LB73.1Z – Structural developmental anomalies of chest wall, unspecified

Foundation entity

Accessory rib – http://id.who.int/icd/entity/166116473

Allowed postcoordination axes

Part of: LB73.1: Structural developmental anomalies of chest wall › LB73: Structural developmental anomalies of spine or bony thorax › 20: Developmental anomalies