ICD-10 Code K51.312 – Ulcerative (chronic) rectosigmoiditis with intestinal obstruction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.312 – Ulcerative (chronic) rectosigmoiditis with intestinal obstruction
What it is
This code identifies chronic ulcerative inflammation limited to the rectosigmoid area, with obstruction of the intestinal passage. Use it when documentation links ulcerative rectosigmoiditis to a true obstructive complication.
Clinical signs
Clinical features vary; refer to documentation. Typical records may note rectal bleeding, diarrhea, urgency, abdominal pain, and evidence of bowel narrowing or blockage consistent with obstruction.
When to use this code
Use K51.312 when the provider documents ulcerative chronic rectosigmoiditis and specifically states intestinal obstruction. The record should support both the ulcerative colitis location and the obstructive complication. If obstruction is suspected but not confirmed, check documentation before coding this combination.
Do not use for
Do not use this code for ulcerative colitis without obstruction, or for obstruction caused by another condition. If the site is different or the chart does not specify rectosigmoid involvement, check documentation.
Coding tip
Verify that both the disease location and the obstruction are explicitly documented before assigning K51.312.