Q23Header code — not billable
Congenital malformations of aortic and mitral valves
- Chapter
- 17. Congenital malformations, deformations and chromosomal abnormalities
- Category
- Q23
- Effective date
- October 1, 2026
Related codes in category Q23
Q23.0Congenital stenosis of aortic valveYesQ23.1Congenital insufficiency of aortic valveYesQ23.2Congenital mitral stenosisYesQ23.3Congenital mitral insufficiencyYesQ23.4Hypoplastic left heart syndromeYesQ23.8Other congenital malformations of aortic and mitral valvesQ23.81Bicuspid aortic valveYesQ23.82Congenital mitral valve cleft leafletYesQ23.88Other congenital malformations of aortic and mitral valvesYesQ23.9Congenital malformation of aortic and mitral valves, unspYes
Frequently asked questions
What is ICD-10 code Q23?
Q23 is an ICD-10-CM diagnosis code for Congenital malformations of aortic and mitral valves.
Is Q23 a billable code?
No. Q23 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is Q23 in?
Q23 falls under Chapter 17: Congenital malformations, deformations and chromosomal abnormalities.
When did Q23 become effective?
Q23 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to Q23?
Q23 belongs to category Q23, 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.