ICD-10 Code D12.3 – Benign neoplasm of transverse colon (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D12.3 – Benign neoplasm of transverse colon
What it is
D12.3 identifies a noncancerous tumor located in the transverse colon. Use it when documentation specifically states a benign neoplasm, adenoma, or similar benign lesion in that segment.
Clinical signs
Clinical features vary; refer to documentation. These lesions are often found during colonoscopy or pathology after polyp removal, and may be asymptomatic unless they cause bleeding or bowel changes.
When to use this code
Use D12.3 when the record clearly documents a benign neoplasm in the transverse colon, whether diagnosed endoscopically or confirmed by pathology. It also applies when the provider identifies an adenomatous polyp in that location and calls it benign. If the site is not specified, check the report before coding.
Do not use for
Do not use this code for malignant colon tumors, dysplasia without a benign neoplasm diagnosis, or inflammatory polyps. If the documentation only says “colon polyp” without a benign diagnosis or location, check documentation.
Coding tip
Match the code to the exact colon segment named in the pathology or procedure note.