K51.213

HCC Category Mapping

What This Code Means

A chronic inflammatory condition limited to the rectum that has created an abnormal tunnel or connection between the rectum and another organ or the skin. This is a serious complication of ulcerative proctitis.

Coding Tips

• •Document the specific type and location of the fistula (e.g., rectovaginal, rectocutaneous)
• •Verify the fistula is a direct result of the ulcerative proctitis and not a separate condition

Clinical Significance

Ulcerative proctitis with fistula indicates development of an abnormal connection between the rectum and adjacent structures. While fistulas are more characteristic of Crohn disease, their occurrence in ulcerative proctitis indicates severe or complicated disease that typically requires surgical evaluation and may prompt reconsideration of the diagnosis.

Documentation Requirements

• ✓Confirmed ulcerative colitis limited to the rectum
• ✓Documentation of fistula type (rectovaginal, perianal, rectocutaneous)
• ✓Imaging confirmation (MRI pelvis, endorectal ultrasound, fistulogram)
• ✓Provider statement attributing fistula to the ulcerative proctitis
• ✓Surgical consultation and treatment plan
• ✓Consideration of whether diagnosis should be reclassified as Crohn disease

Commonly Confused Codes