ICD-10 Code K31.81 – Angiodysplasia of Stomach and Duodenum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.81 – Angiodysplasia of stomach and duodenum
What it is
K31.81 identifies angiodysplasia in the stomach or duodenum, meaning abnormal, fragile blood vessels in the upper gastrointestinal tract. These lesions can bleed and may be found during endoscopy.
Clinical signs
Patients may have upper GI bleeding, iron-deficiency anemia, melena, or occult blood loss. Clinical features vary; refer to documentation for the exact site and bleeding status.
When to use this code
Use K31.81 when the provider documents angiodysplasia specifically in the stomach or duodenum. It is also appropriate when endoscopic findings confirm this location and the diagnosis is recorded in the assessment.
If the note says only “GI angiodysplasia” or gives a different site, you should code the documented location instead. Check documentation when the anatomic site is unclear.
Do not use for
Do not use this code for angiodysplasia in other parts of the digestive tract or for nonspecific gastrointestinal bleeding without a documented lesion. Check documentation if the record does not identify stomach or duodenum.
Coding tip
Assign K31.81 only when the provider links angiodysplasia to the stomach or duodenum; otherwise, query for the exact site.