Malignant neoplasm of undescended left testis

This code signifies a cancerous tumor originating in a left testicle that has not descended into the scrotum. It specifically identifies a primary malignant neoplasm found in an undescended left testis, also known as cryptorchidism.

Apply this code when documentation confirms a primary malignant neoplasm located in the left undescended testis. This diagnosis is typically made following biopsy or surgical excision and subsequent pathological examination. The physician's notes should clearly indicate the laterality and the undescended status of the affected testis.

• Ensure documentation explicitly states "undescended" for the left testis; otherwise, use a code for a descended testicular malignancy.
• Do not confuse with secondary malignant neoplasms; this code is for a primary tumor.
• Consider sequencing this code before any codes for the history of cryptorchidism if the malignancy is the primary reason for the encounter.