Neoplasm of uncertain behavior of left ureter

This code signifies a tumor in the left ureter whose biological behavior cannot be definitively classified as benign or malignant based on current pathological examination. It indicates that the neoplasm exhibits some atypical features but lacks the clear-cut characteristics of malignancy.

Use this code when pathology reports describe a neoplasm of the left ureter as "uncertain," "borderline," "atypical," or "of undetermined malignant potential." This applies when the pathologist cannot definitively categorize the tumor as benign or malignant after microscopic examination.

• Ensure the documentation explicitly specifies the left ureter; laterality is crucial for accurate coding.
• Distinguish carefully from benign neoplasms (D30.4-) or malignant neoplasms (C66.1) of the ureter, which have definitive pathological classifications.
• Always await final pathology reports; provisional diagnoses should not be coded with this category.