ICD-10 Code K51.311 – Ulcerative (chronic) rectosigmoiditis with rectal bleeding (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.311 – Ulcerative (chronic) rectosigmoiditis with rectal bleeding
What it is
K51.311 identifies chronic ulcerative inflammation limited to the rectosigmoid area, with documented rectal bleeding. Use it when the record specifically links ulcerative rectosigmoiditis to bleeding.
Clinical signs
Typical findings include bloody stool, urgency, rectal discomfort, and symptoms of distal colitis. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents ulcerative rectosigmoiditis and also notes rectal bleeding. It is appropriate for follow-up visits, flares, or active disease management when both the location and bleeding are recorded. Check documentation if the bleeding source is unclear.
Do not use for
Do not use this code if ulcerative colitis is documented without rectal bleeding, or if bleeding comes from another cause. Check documentation when the diagnosis is nonspecific.
Coding tip
Verify that both “rectosigmoiditis” and “rectal bleeding” appear in the assessment before assigning K51.311.