ICD-10-CM
ICD-10 code for Hypoplastic left-heart syndrome: Q23.4
The closest CDC title for "Hypoplastic left-heart syndrome" is Q23.4, Hypoplastic left heart syndrome. Q23.4 is a billable code.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under Q23, then other CDC titles that name hypoplastic left heart syndrome
A header groups codes and is not billed. A billable code is one you can report.
- Q23Congenital malformations of aortic and mitral valvesHeader
- Q23.0Congenital stenosis of aortic valveBillable
- Q23.1Congenital insufficiency of aortic valveBillable
- Q23.2Congenital mitral stenosisBillable
- Q23.3Congenital mitral insufficiencyBillable
- Q23.4Hypoplastic left heart syndromeBillable
- Q23.8Other congenital malformations of aortic and mitral valvesHeader
- Q23.81Bicuspid aortic valveBillable
- Q23.82Congenital mitral valve cleft leafletBillable
- Q23.88Other congenital malformations of aortic and mitral valvesBillable
- Q23.9Congenital malformation of aortic and mitral valves, unspecifiedBillable
Related conditions
Related pages
- Q23.4 code detailsNotes, nearby codes, CMS-HCC group
- Category Q23Every code under it
- Chapter 17Congenital malformations and chromosomal abnormalities
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Hypoplastic left-heart syndrome?
The closest CDC title for "Hypoplastic left-heart syndrome" is Q23.4, Hypoplastic left heart syndrome. Q23.4 is a billable code.
Is Q23.4 billable?
Yes. Q23.4 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What chapter is Q23.4 in?
Chapter 17. Congenital malformations and chromosomal abnormalities.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.