Q18: Other congenital malformations of face and neck
Codes under Q18 (Other congenital malformations of face and neck). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| Q18.0 | Sinus, fistula and cyst of branchial cleft | ✓ |
| Q18.0 | Sinus, fistula and cyst of branchial cleft | ✓ |
| Q18.1 | Preauricular sinus and cyst | ✓ |
| Q18.1 | Preauricular sinus and cyst | ✓ |
| Q18.2 | Other branchial cleft malformations | ✓ |
| Q18.2 | Other branchial cleft malformations | ✓ |
| Q18.3 | Webbing of neck | ✓ |
| Q18.3 | Webbing of neck | ✓ |
| Q18.4 | Macrostomia | ✓ |
| Q18.4 | Macrostomia | ✓ |
| Q18.5 | Microstomia | ✓ |
| Q18.5 | Microstomia | ✓ |
| Q18.6 | Macrocheilia | ✓ |
| Q18.6 | Macrocheilia | ✓ |
| Q18.7 | Microcheilia | ✓ |
| Q18.7 | Microcheilia | ✓ |
| Q18.8 | Other specified congenital malformations of face and neck | ✓ |
| Q18.8 | Other specified congenital malformations of face and neck | ✓ |
| Q18.9 | Congenital malformation of face and neck, unspecified | ✓ |
| Q18.9 | Congenital malformation of face and neck, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code Q18?
Q18 is an ICD-10-CM category covering Other congenital malformations of face and neck. It contains 20 more specific diagnosis codes, 20 of which are billable.
Is Q18 a billable code?
No — Q18 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example Q18.0 — Sinus, fistula and cyst of branchial cleft). 20 of the 20 codes under Q18 are billable.
What codes fall under Q18?
Q18 includes Q18.0, Q18.0, Q18.1, Q18.1, Q18.2, plus 15 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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