ICD-10 Code D12.2 – Benign neoplasm of ascending colon (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D12.2 – Benign neoplasm of ascending colon
What it is
D12.2 identifies a noncancerous tumor in the ascending colon, the first segment of the large intestine. Use it when documentation states a benign neoplasm, adenoma, or similar benign growth in this location.
Clinical signs
Clinical features vary; refer to documentation. These lesions are often found during colonoscopy and may be described as a polyp or mass without evidence of malignancy.
When to use this code
Use D12.2 when the provider documents a benign neoplasm specifically located in the ascending colon. It may apply after endoscopic removal, biopsy, or imaging if the diagnosis remains benign and site-specific. If the record only says “colon polyp” or does not specify site, check documentation.
Do not use for
Do not use this code for malignant tumors, carcinoma in situ, or inflammatory bowel disease. Do not assign it when the lesion is in another colon segment or when the pathology is not clearly benign.
Coding tip
Confirm both the benign nature and the exact colonic site before coding.