ICD-10 Code K31.811 – Angiodysplasia of Stomach and Duodenum with Bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.811 – Angiodysplasia of stomach and duodenum with bleeding
What it is
K31.811 identifies angiodysplasia in the stomach or duodenum when it is documented as causing bleeding. It refers to abnormal, fragile blood vessels in the upper gastrointestinal tract.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the record describes upper GI bleeding, such as melena, hematemesis, or anemia, with endoscopic evidence of angiodysplastic lesions.
When to use this code
Use K31.811 when the provider documents angiodysplasia of the stomach or duodenum and states that bleeding is present. It is appropriate when the bleeding source is identified in the upper GI tract and no conflicting diagnosis is documented.
Choose this code from endoscopy, pathology, or physician documentation that clearly links the lesion to bleeding. Check documentation if the site is unspecified or if another gastrointestinal bleeding cause is recorded.
Do not use for
Do not use this code for angiodysplasia without bleeding, or when the lesion is in a different GI site. Check documentation if the note only says “GI bleed” without confirming the stomach or duodenum source.
Coding tip
Code the bleeding site only when the provider clearly documents both angiodysplasia and active or recent bleeding.