Malignant neoplasm of descended left testis

This diagnosis code indicates the presence of a cancerous tumor originating in the left testis, which has properly descended into the scrotum. It specifies a primary malignancy rather than a metastatic lesion from another site.

Apply this code when documentation clearly states a primary malignant neoplasm of the left descended testis. This is typically supported by pathology reports confirming malignancy and imaging studies or surgical notes identifying the left testis as the affected site.

• Ensure the documentation specifies "descended" to differentiate from undescended testes (cryptorchidism).
• Verify the laterality is explicitly stated as "left" to avoid coding errors.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless specific guidelines dictate otherwise (e.g., for chemotherapy or radiation therapy encounters).