Malignant neoplasm of posterior hypopharyngeal wall

This code represents a cancerous tumor originating in the posterior wall of the hypopharynx, which is the lowest part of the pharynx connecting to the esophagus. This malignancy can affect swallowing and breathing due to its location.

Apply this code when documentation clearly specifies a primary malignant neoplasm located specifically on the posterior wall of the hypopharynx. Supporting documentation includes pathology reports confirming malignancy and operative notes or imaging studies detailing the tumor's precise anatomical site.

• Differentiate carefully from other hypopharyngeal subsites (e.g., postcricoid region, pyriform sinus) as these have distinct codes.
• Ensure the documentation specifies "malignant" to avoid confusion with benign or uncertain neoplasms.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant secondary diagnoses.