ICD-10 Code C79.10 – Secondary malignant neoplasm of unspecified urinary organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C79.10 – Secondary malignant neoplasm of unspecified urinary organs
What it is
This code identifies metastatic cancer involving a urinary organ, but the exact site is not specified. Use it when the record confirms secondary malignant disease in the urinary system without naming the organ.
Clinical signs
Clinical features vary; refer to documentation. Records may note a known primary malignancy with spread to a urinary organ, imaging evidence, or pathology confirming metastatic involvement.
When to use this code
Use this code when the provider documents secondary malignant neoplasm in a urinary organ and does not specify kidney, bladder, ureter, or another exact site. It is also appropriate when the chart supports metastasis to the urinary system but the exact organ remains unclear. Check documentation for the most precise site available.
Do not use for
Do not use this code for primary urinary tract cancers or for benign urinary conditions. If the exact urinary organ is documented, code that more specific site instead.
Coding tip
Look for the primary cancer and the exact metastatic site; unspecified codes are appropriate only when the record lacks more detail.