ICD-10-CM > C00-D49 > C00-C14 > C03 C03 Malignant neoplasm of gum Non-Billable/Non-Specific Includes malignant neoplasm of alveolar (ridge) mucosamalignant neoplasm of gingiva Use Additional code to identify:alcohol abuse and dependence (F10.-)history of tobacco dependence (Z87.891)tobacco dependence (F17.-)tobacco use (Z72.0) Type 2 Excludes malignant odontogenic neoplasms (C41.0-C41.1) Codes C03.0Malignant neoplasm of upper gumC03.1Malignant neoplasm of lower gumC03.9Malignant neoplasm of gum, unspecified