ICD-10 Code K57.20 – Diverticulitis of large intestine with perforation and abscess without bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.20 – Diverticulitis of large intestine with perforation and abscess without bleeding
What it is
This code identifies diverticulitis in the large intestine when the inflamed diverticula have perforated and formed an abscess, but there is no documented bleeding. Use it for complicated diverticular disease with localized infection.
Clinical signs
Typical findings include abdominal pain, tenderness, fever, and evidence of localized pericolonic infection or abscess on imaging. Clinical features vary; refer to documentation for perforation, abscess, and the absence of bleeding.
When to use this code
Use K57.20 when the provider documents diverticulitis of the large intestine with perforation and abscess and specifically states there is no bleeding. It also fits cases described as complicated diverticulitis with abscess formation. Check documentation if the note does not clearly identify the site or complication.
Do not use for
Do not use this code for diverticulitis without perforation or abscess, or when bleeding is documented. If the record only says diverticulosis, diverticular disease, or unspecified diverticulitis, choose the more accurate documented code.
Coding tip
Confirm both complications—perforation and abscess—and verify that bleeding is absent before assigning K57.20.