ICD-10 Code D09.10 – Carcinoma in situ of unspecified urinary organ (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D09.10 – Carcinoma in situ of unspecified urinary organ
What it is
This code identifies carcinoma in situ, a noninvasive malignant change, in an unspecified urinary organ. Use it when the record confirms in situ disease but does not name the exact urinary site.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on pathology or a clinician’s statement of carcinoma in situ without evidence of invasion.
When to use this code
Use D09.10 when the provider documents carcinoma in situ involving a urinary organ, but the specific organ is not identified. It may apply when pathology confirms in situ disease and the note only says “urinary organ” or similar wording. If the site is later clarified, code the more specific option instead.
Do not use for
Do not use this code for invasive malignant neoplasms, benign lesions, or urinary tract tumors with a clearly documented site that has a more specific ICD-10 code. Check documentation.
Coding tip
Query the provider if the pathology report names the exact urinary organ, because unspecified coding should be a last resort.