Q18.5: Microstomia
Q18.5 is the billable ICD-10-CM diagnosis code for Microstomia. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code Q18.5?
Q18.5 is the ICD-10-CM diagnosis code for Microstomia. It belongs to category Q18 (Other congenital malformations of face and neck).
Is Q18.5 a billable code?
Yes. Q18.5 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does Q18.5 belong to?
Q18.5 is part of ICD-10-CM category Q18 — Other congenital malformations of face and neck, which has 20 billable codes.
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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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