Q18.4Billable
Macrostomia
- Chapter
- 17. Congenital malformations, deformations and chromosomal abnormalities
- Category
- Q18
- Effective date
- October 1, 2026
Related codes in category Q18
Q18Other congenital malformations of face and neckQ18.0Sinus, fistula and cyst of branchial cleftYesQ18.1Preauricular sinus and cystYesQ18.2Other branchial cleft malformationsYesQ18.3Webbing of neckYesQ18.5MicrostomiaYesQ18.6MacrocheiliaYesQ18.7MicrocheiliaYesQ18.8Other specified congenital malformations of face and neckYesQ18.9Congenital malformation of face and neck, unspecifiedYes
Frequently asked questions
What is ICD-10 code Q18.4?
Q18.4 is an ICD-10-CM diagnosis code for Macrostomia.
Is Q18.4 a billable code?
Yes. Q18.4 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is Q18.4 in?
Q18.4 falls under Chapter 17: Congenital malformations, deformations and chromosomal abnormalities.
When did Q18.4 become effective?
Q18.4 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to Q18.4?
Q18.4 belongs to category Q18, which includes 10 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.