DB33.1

ICD-11 MMS 2026-01

Microscopic colitis

Description

A condition of inflammation of the colon that is only detectable when the colon's lining is examined under a microscope. The endoscopic appearance of the inner colon lining is normal. There are two types of microscopic colitis: lymphocytic colitis and collagenous colitis.

Exclusions from above levels

  • http://id.who.int/icd/entity/588616678 – Gastroenteritis or colitis of infectious origin
  • http://id.who.int/icd/entity/598093212 – Inflammatory bowel diseases
  • 01 – Certain infectious or parasitic diseases
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  • 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

Child codes

  • DB33.10 – Collagenous colitis
  • DB33.11 – Lymphocytic colitis
  • DB33.1Y – Other specified microscopic colitis
  • DB33.1Z – Microscopic colitis, unspecified

Sibling codes

  • DB33.0 – Primary ulcer of colon
  • DB33.2 – Allergic or dietetic colitis
  • DB33.3 – Diversion colitis
  • DB33.4 – Colitis or proctitis due to external causes
  • DB33.Y – Other specified noninfectious colitis or proctitis
  • DB33.Z – Noninfectious colitis or proctitis, unspecified

Foundation entity

Microscopic colitis – http://id.who.int/icd/entity/1122828822

Allowed postcoordination axes

Part of: DB33: Certain noninfectious colitis or proctitis › 13: Diseases of the digestive system