ICD-11 classes
13 Diseases of the digestive system
Diseases of large intestine
DB33 — Certain noninfectious colitis or proctitis
DB33.1 — Microscopic colitis
DB33.10 — Collagenous colitis

ICD-11 DB33.10 — Collagenous colitis

Collagenous colitis is characterised by chronic watery diarrhoea, normal radiological and endoscopic appearance of the colon, and a specific histopathological feature consisting in the presence of a subepithelial collagen band (10 mm or more) adjacent to the basal membrane, together with epithelial lymphocyte infiltration and chronic inflammation of the lamina propria.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.