DA21.0

ICD-11 MMS 2026-01

Achalasia

Description

Achalasia is an oesophageal smooth muscle motility disorder characterised by a loss of peristalsis in the distal oesophagus and a failure of lower oesophageal sphincter (LES) relaxation. Basic mechanism is the degeneration of neurons (ganglion cells) in the myenteric plexuses in the oesophageal wall, but the cause is still unclear.

Index terms

  • Achalasia
  • Cardiospasm
  • achalasia NOS
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  • achalasia of cardia
  • achalasia of oesophagus
  • aperistalsis of the oesophagus
  • cardia achalasia
  • cardia spasm
  • oesophageal achalasia
  • oesophageal cardiospasm
  • oesophagus achalasia
  • reflex cardiospasm
  • Primary achalasia
  • Idiopathic achalasia
  • Non-Chagas achalasia
  • Familial primary achalasia
  • Sporadic primary achalasia

Inclusions

  • Cardiospasm

Excludes

  • LB12.Y – congenital cardiospasm

Exclusions from above levels

  • 01 – Certain infectious or parasitic diseases
  • 02 – Neoplasms
  • 05 – Endocrine, nutritional or metabolic diseases
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  • 06 – Mental, behavioural or neurodevelopmental disorders
  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 22 – Injury, poisoning or certain other consequences of external causes

Sibling codes

  • DA21.1 – Motility disorder of cervical or upper oesophagus
  • DA21.2 – Disorder of oesophageal peristalsis
  • DA21.3 – Disorder of lower oesophageal sphincter function
  • DA21.Y – Other specified motility disorders of oesophagus
  • DA21.Z – Motility disorders of oesophagus, unspecified

Foundation entity

Achalasia – http://id.who.int/icd/entity/636464846

Allowed postcoordination axes

Part of: DA21: Motility disorders of oesophagus › 13: Diseases of the digestive system