ICD-10 Code C64 – Malignant neoplasm of kidney, except renal pelvis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C64 – Malignant neoplasm of kidney, except renal pelvis
What it is
C64 identifies a malignant tumor arising in the kidney, excluding the renal pelvis. Use it for primary kidney cancer when the documentation does not specify a more exact site or laterality.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include an imaging-identified renal mass, hematuria, flank pain, or an incidental kidney lesion suspicious for malignancy.
When to use this code
Use C64 when the provider documents primary kidney cancer, renal cell carcinoma, or another malignant neoplasm of the kidney, except renal pelvis. It also fits when pathology or imaging confirms a malignant renal mass and no more specific code is available.
Do not use it for benign renal tumors or for malignancy limited to the renal pelvis. If laterality or a more specific histology is documented, code to the highest level of specificity supported by the record.
Do not use for
Do not use C64 for cancer of the renal pelvis; that is coded elsewhere. Also avoid it when the record only states a renal cyst, benign neoplasm, or an unspecified kidney finding without malignancy.
Coding tip
Check the pathology, imaging, and provider assessment to confirm the kidney is the primary site and not the renal pelvis.