Malignant neoplasm of renal pelvis (C65)

The ICD-10 code series C65 is specifically used for diagnosing and coding malignant neoplasms of the renal pelvis, the part of the kidney that collects urine before it moves to the ureter. These codes distinguish between cancers of the right renal pelvis (C65.1), left renal pelvis (C65.2), and unspecified renal pelvis (C65.9).

These codes play a crucial role in documenting cancers such as transitional cell carcinoma of either the right or left renal pelvis, also known by synonyms including "primary transitional cell carcinoma of kidney" or "primary malignant neoplasm of renal pelvis." For cases where the location is not specified, C65.9 applies and covers tumors like malignant tumors of the renal calyx or pelviureteric junction. Understanding these distinctions helps medical coders accurately assign the ICD-10 code for renal pelvis cancer and supports healthcare providers in managing and reporting urinary system cancers effectively.