ICD-10 Code K51.20 – Ulcerative (chronic) proctitis without complications (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.20 – Ulcerative (chronic) proctitis without complications
What it is
K51.20 identifies chronic ulcerative inflammation limited to the rectum, without documented complications. Use it when the record shows ulcerative proctitis and does not mention abscess, fistula, obstruction, or other complications.
Clinical signs
Typical findings include rectal bleeding, urgency, tenesmus, and mucus passage. Clinical features vary; refer to documentation for endoscopic or pathology confirmation of ulcerative inflammation confined to the rectum.
When to use this code
Use this code when the provider documents ulcerative proctitis, chronic proctitis due to ulcerative colitis, or ulcerative colitis limited to the rectum without complications. It also fits follow-up encounters when the condition remains active and uncomplicated. Check documentation if the extent is unclear.
Do not use for
Do not use K51.20 if the record describes complications, such as fistula, abscess, or obstruction. It is also not appropriate for nonspecific proctitis or ulcerative colitis involving more than the rectum.
Coding tip
Verify the site and complication status in the note before assigning K51.20.