LD2G

ICD-11 MMS 2026-01

Conjoined twins

Description

A condition characterised as twins that are physically united at some part or parts of their bodies at the time of birth.

Index terms

  • Conjoined twins
  • siamese twin
  • twin fusion
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  • Thoracopagus
  • Synthorax
  • thorax-joined twins
  • Sternopagus
  • Xiphopagus
  • Omphalopagus
  • Pygopagus
  • buttock-joined twins
  • Ischiopagus
  • ischiopagus twins
  • Rachipagus
  • Craniopagus
  • head-joined twins
  • Synencephaly
  • synencephalus
  • Cephalopagus
  • syncephalus
  • Dicephalus
  • Dicephaly
  • conjoined twins with two heads
  • cranial duplication
  • craniodidymus
  • Dipygus
  • Parapagus
  • Cephalothoracopagus
  • janiceps
  • janus
  • Thoracoomphalopagus
  • Parasitic twin

Exclusions from above levels

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

Sibling codes

  • LD20 – Syndromes with central nervous system anomalies as a major feature
  • LD21 – Syndromes with eye anomalies as a major feature
  • LD22 – Syndromes with dental anomalies as a major feature
  • LD23 – Syndromes with vascular anomalies as a major feature
  • LD24 – Syndromes with skeletal anomalies as a major feature
  • LD25 – Syndromes with face or limb anomalies as a major feature
  • LD26 – Syndromes with limb anomalies as a major feature
  • LD27 – Syndromes with skin or mucosal anomalies as a major feature
  • LD28 – Syndromes with connective tissue involvement as a major feature
  • LD29 – Syndromes with obesity as a major feature
  • LD2A – Malformative disorders of sex development
  • LD2B – Syndromes with premature ageing appearance as a major feature
  • LD2C – Overgrowth syndromes
  • LD2D – Phakomatoses or hamartoneoplastic syndromes
  • LD2E – Syndromes with structural anomalies due to inborn errors of metabolism
  • LD2F – Syndromes with multiple structural anomalies, without predominant body system involvement
  • LD2H – Syndromic genetic deafness
  • LD2Y – Other specified multiple developmental anomalies or syndromes
  • LD2Z – Multiple developmental anomalies or syndromes, unspecified

Foundation entity

Conjoined twins – http://id.who.int/icd/entity/1550169484

Part of: 20: Developmental anomalies