ICD-10 Code C65 – Malignant neoplasm of renal pelvis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C65 – Malignant neoplasm of renal pelvis
What it is
C65 identifies a malignant tumor arising in the renal pelvis, the funnel-shaped area that collects urine from the kidney. Use it when the record documents primary cancer of this upper urinary tract site.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include hematuria, flank pain, obstruction, or imaging evidence of a renal pelvis mass, but the diagnosis should be supported by pathology or specialist assessment.
When to use this code
Use C65 when the provider specifies primary malignant neoplasm of the renal pelvis, including laterality if documented elsewhere. It is appropriate for confirmed cancer at this location, such as biopsy-proven urothelial carcinoma involving the renal pelvis. Check documentation if the site is unclear.
Do not use for
Do not use this code for malignant neoplasms of the kidney parenchyma, ureter, or bladder. If the chart only says “kidney cancer” or another urinary tract site without renal pelvis involvement, check documentation.
Coding tip
Verify the exact anatomic site in pathology, operative, or oncology notes before assigning C65.