ICD-10 Code K57.8 – Diverticulitis of intestine, part unspecified, with perforation and abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.8 – Diverticulitis of intestine, part unspecified, with perforation and abscess
What it is
K57.8 identifies diverticulitis in an unspecified intestinal segment when the diverticulum has perforated and an abscess is present. Use it when documentation confirms both complications but does not name the exact bowel location.
Clinical signs
Typical findings include localized abdominal pain, tenderness, fever, and evidence of intra-abdominal infection. Clinical features vary; refer to documentation for the affected site and confirmation of perforation or abscess.
When to use this code
Use this code when the record states diverticulitis with perforation and abscess, but the provider does not specify whether it is colonic, sigmoid, or another intestinal site. It also fits when imaging or operative notes confirm a perforated diverticular process with abscess formation. If the location is documented, code the more specific site instead.
Do not use for
Do not use it for uncomplicated diverticulitis, diverticulosis, or diverticulitis without perforation or abscess. Do not assign it when the record identifies a different bowel segment or another cause of abscess.
Coding tip
Check operative, imaging, and discharge notes for the exact intestinal site before defaulting to an unspecified code.