Malignant neoplasm of lateral wall of nasopharynx

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

Apply this code when documentation clearly specifies a primary malignant neoplasm located on the lateral wall of the nasopharynx. Supporting documentation should include pathology reports confirming malignancy and imaging studies or physician notes detailing the precise anatomical site of the tumor.

• Ensure the documentation specifies "lateral wall" to differentiate from other nasopharyngeal subsites.
• Verify the neoplasm is primary and malignant; do not use for secondary or benign tumors.
• Sequence this code as the primary diagnosis when it is the reason for the encounter or treatment.