ICD-10 Code K57.81 – Diverticulitis of intestine, part unspecified, with perforation and abscess with bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.81 – Diverticulitis of intestine, part unspecified, with perforation and abscess with bleeding
What it is
This code identifies diverticulitis in an unspecified part of the intestine when the diverticulum has perforated and formed an abscess, with associated bleeding. Use it when documentation confirms all listed complications and does not specify the bowel segment.
Clinical signs
Patients may have abdominal pain, localized tenderness, fever, and signs of infection or peritoneal irritation. Bleeding may be documented as hematochezia or other gastrointestinal bleeding; clinical features vary, so refer to documentation.
When to use this code
Use K57.81 when the record clearly states diverticulitis with perforation, abscess, and bleeding, but the involved intestinal part is not identified. It is also appropriate when the provider documents these findings together in the same episode of care. If the site is specified, code the more specific location instead.
Do not use for
Do not use this code for uncomplicated diverticulitis, diverticulitis without bleeding, or diverticular bleeding without diverticulitis. Check documentation if perforation, abscess, or the intestinal segment is not clearly stated.
Coding tip
Confirm all three elements—perforation, abscess, and bleeding—before assigning K57.81; otherwise, select the code that matches the documented complication set.