ICD-10-CM > C00-D49 > C00-C14 > C06 > C06.8 C06.8 Malignant neoplasm of overlapping sites of other and unspecified parts of mouth Non-Billable/Non-Specific Codes C06.80Malignant neoplasm of overlapping sites of unspecified parts of mouthC06.89Malignant neoplasm of overlapping sites of other parts of mouth