ICD-10 Code C64.1 – Malignant neoplasm of right kidney, except renal pelvis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C64.1 – Malignant neoplasm of right kidney, except renal pelvis
What it is
C64.1 identifies a malignant tumor arising in the right kidney, excluding the renal pelvis. Use it when documentation specifies a primary kidney cancer on the right side.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records may note an imaging-detected renal mass, hematuria, flank pain, or unintentional weight loss, but the diagnosis must be supported by provider documentation.
When to use this code
Use C64.1 when the provider documents primary malignant neoplasm of the right kidney and clearly excludes the renal pelvis. It is appropriate for pathology-confirmed renal cancer, oncology follow-up, or preoperative encounters when the right kidney primary site is documented. If the site is unclear, check documentation.
Do not use for
Do not use this code for malignant neoplasm of the renal pelvis, left kidney, or unspecified kidney. Also avoid it when the chart only says “kidney cancer” without laterality or primary site detail.
Coding tip
Verify laterality and that the renal pelvis is excluded before assigning C64.1.