ICD-10 Code K51.413 – Inflammatory polyps of colon with fistula (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.413 – Inflammatory polyps of colon with fistula
What it is
K51.413 identifies inflammatory polyps of the colon occurring with a fistula. It is used when ulcerative colitis-related polypoid inflammation is documented and a fistulous connection is present.
Clinical signs
Documentation may note inflammatory colonic polyps, chronic colitis findings, and a fistula involving the colon. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states inflammatory polyps of the colon and also documents a fistula. It is appropriate when both conditions are attributed to the same ulcerative colitis process. If the fistula site or relationship is unclear, check documentation.
Do not use for
Do not use it for inflammatory polyps without a fistula, or for fistulas unrelated to colonic inflammatory polyps. Check documentation if the chart describes another type of polyp or a different bowel disorder.
Coding tip
Verify that both the polyp diagnosis and fistula are explicitly documented before assigning K51.413.