| Q18 | Other congenital malformations of face and neck | NON-BILLABLE CODE |
| Q18.0 | Sinus, fistula and cyst of branchial cleft | BILLABLE CODE |
| Q18.1 | Preauricular sinus and cyst | BILLABLE CODE |
| Q18.2 | Other branchial cleft malformations | BILLABLE CODE |
| Q18.3 | Webbing of neck | BILLABLE CODE |
| Q18.5 | Microstomia | BILLABLE CODE |
| Q18.6 | Macrocheilia | BILLABLE CODE |
| Q18.7 | Microcheilia | BILLABLE CODE |
| Q18.8 | Other specified congenital malformations of face and neck | BILLABLE CODE |
| Q18.9 | Congenital malformation of face and neck, unspecified | BILLABLE CODE |
