ICD-10 Code K55.2 – Angiodysplasia of colon (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K55.2 – Angiodysplasia of colon
What it is
K55.2 identifies angiodysplasia in the colon, a vascular abnormality made up of fragile, dilated blood vessels. It is a documented cause of lower gastrointestinal bleeding.
Clinical signs
Clinical features vary; refer to documentation. Common findings include intermittent rectal bleeding, positive fecal blood testing, or anemia when the lesion bleeds.
When to use this code
Use K55.2 when the provider documents angiodysplasia specifically in the colon, with or without active bleeding. It may also apply when colonoscopy or other evaluation confirms the lesion as the bleeding source. Check documentation if the site is described more broadly or another vascular disorder is named.
Do not use for
Do not use this code for angiodysplasia in another gastrointestinal site, such as the stomach or small intestine. Do not assign it when the record only says gastrointestinal bleeding without confirmed colonic angiodysplasia.
Coding tip
Link the code to the documented colon location and avoid assuming the diagnosis from bleeding alone.