DD91.1

ICD-11 MMS 2026-01

Functional constipation

Description

Functional constipation is a functional bowel disorder that presents as persistently difficult, infrequent, or seemingly incomplete defecation, which do not meet IBS criteria.

Index terms

  • Functional constipation
  • functional constipation with slow transit
  • neurogenic constipation
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  • spastic constipation
  • Atonic constipation

Excludes

Exclusions from above levels

  • 6B23 – Hypochondriasis
  • 6C20 – Bodily distress disorder
  • 21 – Symptoms, signs or clinical findings, not elsewhere classified
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  • 01 – Certain infectious or parasitic diseases
  • 02 – Neoplasms
  • 05 – Endocrine, nutritional or metabolic diseases
  • 06 – Mental, behavioural or neurodevelopmental disorders
  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 22 – Injury, poisoning or certain other consequences of external causes

Foundation children elsewhere

  • DB32.1 – Slow transit constipation

Sibling codes

  • DD91.0 – Irritable bowel syndrome
  • DD91.2 – Functional diarrhoea
  • DD91.3 – Functional bloating
  • DD91.4 – Functional abdominal pain syndrome
  • DD91.Y – Other specified irritable bowel syndrome or functional bowel disorders
  • DD91.Z – Irritable bowel syndrome or functional bowel disorders, unspecified

Foundation entity

Functional constipation – http://id.who.int/icd/entity/567494041

Allowed postcoordination axes

Part of: DD91: Irritable bowel syndrome or certain specified functional bowel disorders › 13: Diseases of the digestive system