ICD-10 Code K57.31 – Diverticulosis of large intestine without perforation or abscess with bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.31 – Diverticulosis of large intestine without perforation or abscess with bleeding
What it is
K57.31 identifies diverticulosis of the large intestine when diverticula are present and there is bleeding, but no perforation or abscess. Use it for documented colonic diverticular disease with hemorrhage.
Clinical signs
Typical findings include lower gastrointestinal bleeding, such as hematochezia or maroon stools, in a patient with known or suspected colonic diverticulosis. Clinical features vary; refer to documentation.
When to use this code
Use K57.31 when the record clearly states diverticulosis of the large intestine with bleeding and does not describe perforation or abscess. It also fits when diverticular bleeding is confirmed as the source of hemorrhage. If the site or complication is unclear, check documentation before coding.
Do not use for
Do not use this code for diverticulitis, perforated diverticular disease, or diverticular abscess. Also avoid it when bleeding is not documented or another gastrointestinal source is identified.
Coding tip
Confirm that the provider links the bleeding to large-intestine diverticulosis before assigning K57.31.