ICD-10 Code K57.2 – Diverticulitis of large intestine with perforation and abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.2 – Diverticulitis of large intestine with perforation and abscess
What it is
K57.2 identifies diverticulitis of the large intestine when inflammation is complicated by a perforation and an abscess. Use it for documented colonic diverticulitis with localized infection or contained rupture.
Clinical signs
Typical findings include left lower quadrant abdominal pain, tenderness, fever, and leukocytosis, but clinical features vary; refer to documentation. Imaging often shows inflamed diverticula with a perforation and associated abscess.
When to use this code
Use K57.2 when the record clearly states diverticulitis of the colon or large intestine with both perforation and abscess. It is appropriate when imaging, operative notes, or discharge summaries confirm these complications. If the site or complication is not documented, check documentation before coding.
Do not use for
Do not use this code for uncomplicated diverticulitis, diverticular bleeding, or diverticulitis without perforation or abscess. If the documentation describes small intestine disease or another intestinal condition, select the more specific diagnosis.
Coding tip
Code K57.2 only when both perforation and abscess are explicitly documented; if one element is missing, verify the record.