Neoplasm of uncertain behavior of left testis

This code signifies the presence of an abnormal growth in the left testicle where the biological behavior (whether it is benign or malignant) cannot be definitively determined from pathological examination. It indicates a tumor that has some features of malignancy but lacks sufficient evidence for a definitive cancer diagnosis, or conversely, a tumor with some atypical features that prevent a clear benign classification.

Apply this code when pathology reports describe a testicular neoplasm as "uncertain behavior," "borderline," "of unknown malignant potential," or similar ambiguous terms, specifically located in the left testis. This is typically used following biopsy or surgical excision when the pathologist cannot definitively classify the tumor as benign or malignant.

• Ensure the documentation explicitly states "left testis" and "uncertain behavior" or equivalent terminology.
• Do not use this code if the pathology definitively classifies the neoplasm as benign (D29.21) or malignant (C62.91).
• Consider sequencing this code as the primary diagnosis when the neoplasm is the reason for the encounter, followed by any associated symptoms.