Malignant neoplasm of nasal cavity

This diagnosis code signifies the presence of a primary cancerous tumor originating within the nasal cavity. This includes malignancies affecting the internal structures of the nose, such as the nasal septum, lateral walls, and floor, but excludes those of the skin or bone.

Use this code when documentation clearly indicates a primary malignant neoplasm confined to the nasal cavity. This typically applies to diagnoses of squamous cell carcinoma, adenocarcinoma, or other primary cancers identified through biopsy and imaging studies of the nasal passages.

• Carefully review pathology reports and imaging findings to confirm the primary site is indeed the nasal cavity and not an adjacent structure.
• Distinguish this code from malignancies of the external nose (skin), nasal bone, or nasopharynx, as these have separate and distinct codes.
• Ensure the documentation specifies "malignant" and "primary" to avoid confusion with benign lesions or metastatic disease.