ICD-10 Code C65.1 – Malignant neoplasm of right renal pelvis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C65.1 – Malignant neoplasm of right renal pelvis
What it is
C65.1 identifies a malignant tumor arising in the right renal pelvis, the collecting area where urine drains from the right kidney. Use it for documented cancer in that specific site.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include hematuria, flank pain, or imaging and endoscopic evidence of a right renal pelvis mass.
When to use this code
Use C65.1 when the provider documents primary cancer of the right renal pelvis, or when pathology confirms that exact anatomic site. It also fits encounters focused on evaluation, staging, or follow-up of that known malignancy. Check documentation if the record only says upper urinary tract cancer.
Do not use for
Do not use this code for malignant neoplasm of the right kidney parenchyma, ureter, or bladder. If the tumor site is unclear or described only as metastatic disease, check documentation.
Coding tip
Code the laterality exactly as documented; right renal pelvis is not the same as unspecified renal pelvis.