ICD-10 Code K51.314 – Ulcerative (chronic) rectosigmoiditis with abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.314 – Ulcerative (chronic) rectosigmoiditis with abscess
What it is
K51.314 identifies chronic ulcerative inflammation limited to the rectosigmoid area, with an abscess documented. Use it when the record clearly links ulcerative rectosigmoiditis and abscess formation.
Clinical signs
Typical findings include chronic bloody diarrhea, rectal urgency, abdominal cramping, and local inflammatory complications. Clinical features vary; refer to documentation for confirmation of the rectosigmoid location and abscess.
When to use this code
Use this code when the provider documents ulcerative chronic rectosigmoiditis and specifically notes an abscess. It fits encounters where the diagnosis is established and the complication is part of the current condition.
Code it from the medical record, not from suspicion alone. If the chart names ulcerative colitis elsewhere but does not specify rectosigmoid involvement or abscess, check documentation before assigning K51.314.
Do not use for
Do not use this code for ulcerative colitis without rectosigmoid involvement, or when abscess is absent. Check documentation if the record describes Crohn disease, infectious colitis, or an unspecified intestinal abscess.
Coding tip
Verify both the anatomic site and the abscess in the provider note before coding K51.314.