ICD-10-CM > C00-D49 > C00-C14 > C01 C01 Malignant neoplasm of base of tongue Billable/Specific Copy Code Copy Description Applicable To Malignant neoplasm of dorsal surface of base of tongueMalignant neoplasm of fixed part of tongue NOSMalignant neoplasm of posterior third of tongue Use Additional code to identify:alcohol abuse and dependence (F10.-)history of tobacco dependence (Z87.891)tobacco dependence (F17.-)tobacco use (Z72.0)