ICD-10 Code K57.40 – Diverticulitis of both small and large intestine with perforation and abscess without bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.40 – Diverticulitis of both small and large intestine with perforation and abscess without bleeding
What it is
K57.40 identifies diverticulitis affecting both the small and large intestine when there is perforation and abscess, but no bleeding. Use it for documented inflammatory diverticular disease with these complications.
Clinical signs
Typical findings include abdominal pain, tenderness, fever, and evidence of localized infection or abscess. Clinical features vary; refer to documentation, imaging, or operative findings confirming perforation and abscess.
When to use this code
Use this code when the record clearly states diverticulitis involving both small and large intestine with perforation and abscess, and bleeding is not documented. It fits inpatient, emergency, or surgical notes that confirm the complication pattern. If the site or complication is unclear, check documentation.
Do not use for
Do not use it for diverticulitis without perforation or abscess, or when bleeding is present. Also avoid it if only one intestinal site is documented and the combined site is not supported.
Coding tip
Confirm both anatomy and complication status in the final diagnosis, discharge summary, or operative report before assigning K57.40.