ICD-10 Code C79.0 – Secondary malignant neoplasm of kidney and renal pelvis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C79.0 – Secondary malignant neoplasm of kidney and renal pelvis
What it is
This code identifies metastatic cancer that has spread to the kidney or renal pelvis from a primary site elsewhere. Use it when the kidney involvement is secondary, not a primary renal cancer.
Clinical signs
Clinical features vary; refer to documentation. Imaging or pathology may show a renal or renal pelvic mass, and the record should support metastatic disease from another primary malignancy.
When to use this code
Use C79.0 when the provider documents secondary malignant involvement of the kidney or renal pelvis, such as metastatic disease seen on imaging, biopsy, or operative findings. You should also use it when the note clearly states renal metastasis from a known primary cancer. Check documentation if the site is described only as a renal mass or lesion.
Do not use for
Do not use this code for primary kidney cancer or for unspecified urinary tract masses without evidence of metastasis. If the record does not confirm secondary malignant disease, check documentation.
Coding tip
Confirm both the metastatic site and the primary cancer site in the chart before assigning C79.0.