ICD-10 Code K51.4 – Inflammatory polyps of colon (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.4 – Inflammatory polyps of colon
What it is
K51.4 identifies inflammatory polyps of the colon, also called pseudopolyps. These are noncancerous polyp-like projections that form in the setting of chronic colonic inflammation, most often inflammatory bowel disease.
Clinical signs
Clinical features vary; refer to documentation. Colonoscopy may show multiple irregular polypoid lesions in an inflamed colon, often with surrounding mucosal injury or ulceration.
When to use this code
Use K51.4 when the provider documents inflammatory polyps of the colon, including pseudopolyps, as the diagnosis. Code it when the finding is confirmed endoscopically or clearly stated in the record. If the note only mentions a generic colon polyp, check documentation before assigning this code.
Do not use for
Do not use this code for adenomatous, hyperplastic, or malignant colon polyps. If the polyp type is not specified as inflammatory, check documentation.
Coding tip
Link K51.4 to the underlying colitis documentation when the record supports it, and avoid using it for unspecified polyps.