Malignant neoplasm of trigone of bladder

This code identifies a primary cancerous tumor originating in the trigone, a triangular region at the base of the bladder where the ureters enter and the urethra exits. This malignancy is characterized by uncontrolled cell growth within the epithelial lining or deeper tissues of this specific bladder area.

Use this code for confirmed diagnoses of primary malignant neoplasms located specifically within the trigone of the urinary bladder. Documentation should clearly state "malignant neoplasm," "carcinoma," or "adenocarcinoma" of the trigone, supported by pathology reports or physician's definitive diagnosis.

• Ensure documentation specifies "trigone" as the exact anatomical site; do not use for general bladder malignancies.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless treatment is directed at a metastatic site.
• Review pathology reports carefully to confirm malignancy and precise location within the bladder.