ICD-10 Code K51.40 – Inflammatory polyps of colon without complications (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.40 – Inflammatory polyps of colon without complications
What it is
K51.40 identifies inflammatory polyps of the colon in the absence of documented complications. Use it when the chart specifically links the polyp to inflammation rather than a neoplastic or other polyp type.
Clinical signs
Clinical features vary; refer to documentation. Colonoscopy or pathology may describe inflammatory polyps, pseudopolyps, or mucosal inflammatory changes in the colon.
When to use this code
Use K51.40 when the provider documents inflammatory polyps of the colon and does not note bleeding, obstruction, perforation, or another complication. It may appear in the setting of inflammatory bowel disease when the polyp finding is clearly recorded.
If the record only says “colon polyp” or gives a different histology, you should not assume this code. Check documentation for the exact site, type, and whether complications are present.
Do not use for
Do not use this code for adenomatous, hyperplastic, or unspecified colon polyps. Also avoid it when the note documents complications or when the inflammatory polyp is not in the colon.
Coding tip
Code from the provider’s final diagnosis or pathology report, and verify that “without complications” is supported in the record.