LB76

ICD-11 MMS 2026-01

Triphalangeal thumb

Description

A condition caused by failure of the thumb to correctly develop during the antenatal period. This condition is characterised by a long, finger-like thumb with three phalanges instead of two. Isolated triphalangeal thumbs may be associated with genetic abnormality in the 7q36 region.

Index terms

  • Triphalangeal thumb
  • Fingerlike thumb
  • Triphalangism
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  • Triphalangeal thumb, unilateral
  • Triphalangeal thumb, bilateral

Exclusions from above levels

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

Sibling codes

  • LB70 – Structural developmental anomalies of cranium
  • LB71 – Structural developmental anomalies of facial bones
  • LB72 – Structural developmental anomalies of shoulder girdle
  • LB73 – Structural developmental anomalies of spine or bony thorax
  • LB74 – Structural developmental anomalies of pelvic girdle
  • LB75 – Brachydactyly
  • LB77 – Hyperphalangy
  • LB78 – Polydactyly
  • LB79 – Syndactyly
  • LB90 – Joint formation defects
  • LB91 – Congenital shoulder dislocation
  • LB92 – Congenital elbow dislocation
  • LB93 – Congenital knee dislocation
  • LB94 – Congenital patella dislocation
  • LB95 – Patella aplasia or hypoplasia
  • LB96 – Congenital bowing of long bones
  • LB97 – Limb overgrowth
  • LB98 – Congenital deformities of feet
  • LB99 – Reduction defects of upper limb
  • LB9A – Reduction defects of lower limb
  • LB9B – Reduction defects of upper and lower limbs
  • LB9Y – Other specified structural developmental anomalies of the skeleton
  • LB9Z – Structural developmental anomalies of the skeleton, unspecified

Foundation entity

Triphalangeal thumb – http://id.who.int/icd/entity/12402839

Allowed postcoordination axes

Part of: 20: Developmental anomalies