| Code | Display | Definition |
| 209615D | Lower labial frenum | The folds of mucous membrane extending from the gingiva to the midline of the lower lip. |
| 209620D | Upper labial frenum | The folds of mucous membrane extending from the gingiva to the midline of the upper lip. |
| 209631D | Upper buccal frenum | A fold or band of mucous membrane connecting the upper alveolar ridge to the cheek and separating the labial vestibule from the buccal vestibule |
| 209645D | Lower buccal frenum | A fold or band of mucous membrane connecting the lower alveolar ridge to the cheek and separating the labial vestibule from the buccal vestibule |