Q18.5
Billable codeMicrostomia
The ICD-10 code for microstomia is Q18.5.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- Q18.0Sinus, fistula and cyst of branchial cleft
- Q18.1Preauricular sinus and cyst
- Q18.2Other branchial cleft malformations
- Q18.3Webbing of neck
- Q18.4Macrostomia
- Q18.6Macrocheilia
- Q18.7Microcheilia
- Q18.8Other specified congenital malformations of face and neck
- Q18.9Congenital malformation of face and neck, unspecified
- Q18.5Microstomia
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 74484
Associated MS-DRGs
Q18.5 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.