Malignant neoplasm of pyriform sinus

This code signifies a primary cancerous tumor originating in the pyriform sinus, which is a pear-shaped recess on either side of the laryngeal inlet. This malignancy is a type of hypopharyngeal cancer, often presenting with symptoms such as dysphagia, odynophagia, or referred otalgia.

Apply this code when documentation clearly states a diagnosis of malignant neoplasm of the pyriform sinus. This diagnosis is typically confirmed through biopsy and imaging studies like CT or MRI. Use for initial encounters, subsequent treatment, or follow-up for this specific primary site.

• Ensure the documentation specifies "pyriform sinus" and not a more general hypopharyngeal site.
• Distinguish from secondary malignancies or metastatic disease to this area.
• Consider additional codes for laterality (if applicable and documented) and any associated complications or treatment.