ICD-10 Code D01.9 – Carcinoma in situ of digestive organ, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D01.9 – Carcinoma in situ of digestive organ, unspecified
What it is
D01.9 identifies a carcinoma in situ involving a digestive organ when the site is not specified in the record. It means abnormal cells are confined to the lining and have not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on pathology showing malignant-appearing cells limited to epithelium, without evidence of invasion into surrounding tissue.
When to use this code
Use D01.9 when the provider documents carcinoma in situ of a digestive organ but does not name the exact organ site. It is appropriate when pathology or the final diagnosis confirms in situ disease and the record remains nonspecific. Check documentation if the site is later clarified.
Do not use for
Do not use this code for invasive malignant neoplasms, benign lesions, or dysplasia without carcinoma in situ. If the digestive organ site is specified, code the more precise site instead.
Coding tip
Query for the exact digestive site whenever the record says only “digestive organ” or “GI tract.”