Malignant neoplasm of trigone of urinary bladder

This code signifies a primary cancerous tumor originating in the trigone region of the urinary bladder. The trigone is a triangular area at the base of the bladder, formed by the two ureteral openings and the internal urethral opening. This malignancy is characterized by uncontrolled cell growth within this specific anatomical site.

Apply this code when documentation clearly indicates a diagnosis of primary malignant neoplasm localized to the trigone of the urinary bladder. This diagnosis is typically confirmed through biopsy and pathological examination. Use this code for initial diagnosis, active treatment, or follow-up care related to this specific cancer.

• Ensure documentation specifies "trigone" and not just "bladder" generally, as other bladder sites have distinct codes.
• Distinguish from secondary malignancies or carcinoma in situ, which have different ICD-9-CM codes.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant chemotherapy or radiation therapy codes.