Malignant neoplasm of pyriform sinus

This code signifies a cancerous tumor originating in the pyriform sinus, a pear-shaped recess located in the hypopharynx. This malignancy is a type of head and neck cancer, often presenting with symptoms related to swallowing or voice changes.

Assign this code when documentation explicitly states a primary malignant neoplasm of the pyriform sinus. This diagnosis is typically confirmed through biopsy and imaging studies such as CT or MRI. Use this code for initial diagnosis, treatment, and follow-up care of this specific cancer.

• Always confirm the primary site; do not use for metastatic disease to the pyriform sinus.
• Distinguish from other hypopharyngeal subsites (e.g., postcricoid region, posterior pharyngeal wall).
• Ensure laterality, if specified in the documentation, is captured with an appropriate subcategory if available.