ICD-10 Code D12.8 – Benign neoplasm of rectum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D12.8 – Benign neoplasm of rectum
What it is
D12.8 identifies a noncancerous tumor located in the rectum. Use it when documentation states a benign rectal neoplasm, such as an adenoma or polyp, without evidence of malignancy.
Clinical signs
Clinical features vary; refer to documentation. Rectal lesions may be found during colonoscopy, imaging, or biopsy, and may be associated with bleeding, altered bowel habits, or no symptoms at all.
When to use this code
Use D12.8 when the provider documents a benign neoplasm specifically in the rectum. It is appropriate for pathology-confirmed benign rectal tumors and for endoscopic findings recorded as benign rectal lesions. If the record only says “polyp” or “mass,” confirm the final diagnosis before coding.
Do not use for
Do not use this code for malignant rectal tumors, carcinoma in situ, or benign neoplasms of other colorectal sites. Check documentation if the lesion is described only as uncertain, inflammatory, or unspecified.
Coding tip
Code from the provider’s final diagnosis and site documentation; rectal location matters, so do not substitute a colon or anal code.