Malignant neoplasm of posterior wall of hypopharynx

This code signifies a cancerous tumor originating in the posterior wall of the hypopharynx, which is the lowest part of the pharynx, extending from the epiglottis to the esophagus. This malignancy involves the back surface of this specific anatomical region.

Use this code when documentation explicitly states a primary malignant neoplasm located on the posterior wall of the hypopharynx. This diagnosis is typically confirmed by biopsy and imaging studies, with the pathology report specifying the exact site of origin.

• Ensure the documentation specifies "posterior wall" to differentiate from other hypopharyngeal subsites.
• Do not confuse with malignant neoplasms of other pharyngeal regions (e.g., nasopharynx, oropharynx) or unspecified hypopharyngeal sites.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant secondary diagnoses.