ICD-10 Code K57.00 – Diverticulitis of small intestine with perforation and abscess without bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.00 – Diverticulitis of small intestine with perforation and abscess without bleeding
What it is
This code identifies diverticulitis in the small intestine when the diverticulum is inflamed, has perforated, and an abscess is present. It excludes bleeding, so you should not use it when hemorrhage is documented.
Clinical signs
Typical findings include abdominal pain, localized tenderness, fever, and signs of intra-abdominal infection. Clinical features vary; refer to documentation for confirmation of perforation and abscess.
When to use this code
Use K57.00 when the record clearly states small-intestine diverticulitis with both perforation and abscess, and no bleeding is documented. Apply it for operative, imaging, or discharge documentation that supports these details. If the site or complication is unclear, check documentation.
Do not use for
Do not use this code for diverticulitis without perforation or without abscess, or when bleeding is present. Do not assume small-intestine involvement if the note only says diverticulitis.
Coding tip
Verify the anatomic site and both complications in the provider note before assigning K57.00.