Malignant neoplasm of lateral wall of nasopharynx

This code identifies a primary cancerous tumor originating from the lateral wall of the nasopharynx. This specific anatomical site refers to the side walls of the upper part of the pharynx, behind the nose, which can include structures like the fossa of Rosenmüller.

Use this code for confirmed diagnoses of primary malignant neoplasms located specifically on the lateral wall of the nasopharynx. Documentation should clearly state the malignancy and its precise anatomical origin within the nasopharynx, distinguishing it from other nasopharyngeal subsites.

• Ensure documentation specifies "lateral wall" to differentiate from other nasopharyngeal sites (e.g., superior wall, anterior wall).
• Do not use for secondary malignancies or carcinoma in situ; these have distinct codes.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant codes for metastasis or associated conditions.