Malignant neoplasm of right renal pelvis

This code signifies a primary cancerous tumor originating in the renal pelvis of the right kidney. This is a type of urothelial carcinoma that develops in the collecting system of the kidney.

Assign this code when documentation confirms a primary malignant neoplasm located specifically within the right renal pelvis. This diagnosis is typically established through biopsy and imaging studies.

• Ensure laterality is clearly documented as "right" to avoid confusion with C65.2 (left renal pelvis) or C65.9 (unspecified).
• Distinguish from renal cell carcinoma (C64.-) which originates in the renal parenchyma, not the pelvis.
• Sequence as the primary diagnosis when it is the reason for the encounter or treatment.