Malignant neoplasm of posterior wall of nasopharynx

This code identifies a primary cancerous tumor originating in the posterior wall of the nasopharynx. This specific anatomical site is located at the back of the nasopharynx, the upper part of the pharynx behind the nose. The malignancy is characterized by uncontrolled cell growth and has the potential to invade surrounding tissues or metastasize.

Apply this code when documentation confirms a primary malignant neoplasm specifically located on the posterior wall of the nasopharynx. This diagnosis is typically established through biopsy and histopathological examination. Use this code for initial encounters, subsequent treatment, or surveillance of this specific primary tumor.

• Ensure the documentation explicitly states "posterior wall" of the nasopharynx; avoid using for unspecified or other sites.
• Do not use this code for secondary metastatic tumors to the nasopharynx; use a secondary malignancy code instead.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any associated symptoms or complications.