ICD-10-CM > C00-D49 > C00-C14 > C13 C13 Malignant neoplasm of hypopharynx Non-Billable/Non-Specific Use Additional code to identify:exposure to environmental tobacco smoke (Z77.22)exposure to tobacco smoke in the perinatal period (P96.81)history of tobacco dependence (Z87.891)occupational exposure to environmental tobacco smoke (Z57.31)tobacco dependence (F17.-)tobacco use (Z72.0) Type 2 Excludes malignant neoplasm of pyriform sinus (C12) Codes C13.0Malignant neoplasm of postcricoid regionC13.1Malignant neoplasm of aryepiglottic fold, hypopharyngeal aspectC13.2Malignant neoplasm of posterior wall of hypopharynxC13.8Malignant neoplasm of overlapping sites of hypopharynxC13.9Malignant neoplasm of hypopharynx, unspecified