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ICD-10-CM 2027 diagnosis code

Q18Other congenital malformations of face and neck

Not billable — use a more specific code

Q18 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q18

Q18 is the ICD-10-CM diagnosis code for other congenital malformations of face and neck. It belongs to block Q10-Q18 (congenital malformations of eye, ear, face and neck) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Q18.0 (cleft), Q18.1 (cyst), Q18.2 (malformations), Q18.3 (neck), Q18.4 (Macrostomia), Q18.5 (Microstomia), Q18.6 (Macrocheilia), Q18.7 (Microcheilia) and 2 more.

Don't report Q18 together with the conditions in its Excludes1 note: cleft lip and cleft palate (Q35-Q37), conditions classified to Q67.0-Q67.4, congenital malformations of skull and face bones (Q75.-), cyclopia (Q87.0) and 3 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under Q18

Coding notes

Excludes1Not coded here — never report together with this code
  • cleft lip and cleft palate (Q35-Q37)
  • conditions classified to Q67.0-Q67.4
  • congenital malformations of skull and face bones (Q75.-)
  • cyclopia (Q87.0)
  • dentofacial anomalies [including malocclusion] (M26.-)
  • malformation syndromes affecting facial appearance (Q87.0)
  • persistent thyroglossal duct (Q89.2)

Notes that apply from higher levels

Instructions written at a parent level also apply to Q18.

Broader instructions also apply from Q10-Q18 Congenital malformations of eye, ear, face and neck and Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Codes whose notes reference Q18

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Q18

Is Q18 billable?

No. Q18 is a header code. Report one of its more specific subcodes instead.