ICD-10 Code K57.12 – Diverticulitis of small intestine without perforation or abscess without bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K57.12 – Diverticulitis of small intestine without perforation or abscess without bleeding
What it is
This code identifies inflammation of a small-intestine diverticulum without perforation, abscess, or bleeding. Use it when the record shows uncomplicated diverticulitis limited to the small bowel.
Clinical signs
Typical findings include localized abdominal pain, tenderness, and sometimes nausea or altered bowel habits. Clinical features vary; refer to documentation for imaging or exam evidence supporting small-intestine diverticulitis.
When to use this code
Use K57.12 when the provider documents diverticulitis of the small intestine and specifically states there is no perforation, abscess, or bleeding. It also fits confirmed uncomplicated cases on imaging or in the assessment. If the note is unclear about location or complications, check documentation before coding.
Do not use for
Do not use this code for diverticulitis of the colon, or when perforation, abscess, or bleeding is documented. If the record only says “diverticulosis” or is nonspecific, this code is not appropriate.
Coding tip
Match the anatomic site and complication status exactly; if either is missing, query the record rather than assuming K57.12.