| C06 | Malignant neoplasm of other and unspecified parts of mouth | NON-BILLABLE CODE |
| C06.0 | Malignant neoplasm of cheek mucosa | BILLABLE CODE |
| C06.1 | Malignant neoplasm of vestibule of mouth | BILLABLE CODE |
| C06.2 | Malignant neoplasm of retromolar area | BILLABLE CODE |
| C06.8 | Malignant neoplasm of overlapping sites of other and unspecified parts of mouth | NON-BILLABLE CODE |
| C06.80 | Malignant neoplasm of overlapping sites of unspecified parts of mouth | BILLABLE CODE |
| C06.89 | Malignant neoplasm of overlapping sites of other parts of mouth | BILLABLE CODE |
