ICD-10 Code K51.218 – Ulcerative (chronic) proctitis with other complication (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.218 – Ulcerative (chronic) proctitis with other complication
What it is
K51.218 identifies chronic ulcerative inflammation limited to the rectum, with an additional documented complication. Use it when the record clearly states ulcerative proctitis and another complication is present.
Clinical signs
Typical findings include rectal bleeding, urgency, mucus, tenesmus, and diarrhea. Clinical features vary; refer to documentation for the specific complication, such as fistula, abscess, or obstruction.
When to use this code
Use this code when the provider documents chronic ulcerative proctitis plus a qualifying complication and does not assign a more specific code. It may apply in outpatient, inpatient, or problem-list documentation if the complication is clearly linked. Check documentation if the record only says ulcerative colitis without rectal involvement.
Do not use for
Do not use it for ulcerative colitis without rectal involvement or for proctitis due to infection, radiation, or other non-ulcerative causes. Check documentation if the complication is not specified.
Coding tip
Assign K51.218 only when both chronic ulcerative proctitis and “other complication” are explicitly documented.