Malignant neoplasm of unspecified ureter

This diagnosis code signifies a cancerous tumor originating in the ureter, the tube that carries urine from the kidney to the bladder, when the specific location within the ureter is not documented. It indicates a primary malignancy of the ureter without further anatomical specification.

Apply this code when documentation confirms a malignant neoplasm of the ureter but lacks details regarding laterality (left or right) or specific segment (e.g., upper, middle, lower). This is appropriate for pathology reports confirming ureteral carcinoma without further localization.

• Avoid using this code if the laterality or specific segment of the ureter is documented; instead, use a more specific C66.0 or C66.1 code.
• Always review the pathology report and operative notes for precise anatomical detail.
• Sequence this code as the primary diagnosis when the ureteral malignancy is the reason for the encounter or treatment.