ICD-10 Code D09.1 – Carcinoma in situ of other and unspecified urinary organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D09.1 – Carcinoma in situ of other and unspecified urinary organs
What it is
D09.1 identifies carcinoma in situ, a noninvasive malignant lesion in urinary organs other than the bladder, or when the exact urinary site is not specified. The abnormal cells remain confined to the epithelium and have not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on pathology showing carcinoma in situ without stromal invasion, often after cystoscopic or tissue sampling evaluation of a urinary tract lesion.
When to use this code
Use D09.1 when the provider documents carcinoma in situ involving a urinary organ not separately classified in ICD-10-CM, or when the record states an unspecified urinary organ. Code it from pathology or final clinician documentation, not from suspected disease alone.
If the site is later clarified, select the more specific code instead. Check documentation when the report mentions urinary tract carcinoma in situ but does not name the exact organ.
Do not use for
Do not use this code for invasive urinary malignancy, benign urinary lesions, or carcinoma in situ of the bladder, which is coded elsewhere. Check documentation if the site or invasiveness is unclear.
Coding tip
Assign D09.1 only when the record clearly supports in situ disease and the urinary site is other than bladder or remains unspecified.