ICD-10 Code K57.33 – Diverticulitis of large intestine without perforation or abscess with bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.33 – Diverticulitis of large intestine without perforation or abscess with bleeding
What it is
K57.33 identifies diverticulitis affecting the large intestine when the diverticula are inflamed and there is bleeding, but no perforation or abscess. Use it for documented diverticulitis with hemorrhage in the colon or large bowel.
Clinical signs
Typical findings include left lower quadrant abdominal pain, tenderness, and evidence of lower gastrointestinal bleeding. Clinical features vary; refer to documentation for the bleeding source and whether perforation or abscess is absent.
When to use this code
Use this code when the record clearly states diverticulitis of the large intestine with bleeding and specifically notes no perforation or abscess. It is appropriate for inpatient, outpatient, or emergency documentation that supports both the diverticulitis and hemorrhage components.
If the note only says diverticulosis, diverticular bleeding, or diverticulitis without location or complication details, check documentation before coding. Confirm the anatomic site is the large intestine and that the bleeding is tied to the diverticulitis episode.
Do not use for
Do not use K57.33 for diverticulitis with perforation, abscess, or for uncomplicated diverticulitis without bleeding. Do not assign it when the bleeding source is elsewhere or when the documentation is nonspecific.
Coding tip
Verify that the provider documents both bleeding and the absence of perforation or abscess before assigning K57.33.