Is Q23.4 a billable ICD-10 code?

Yes. Q23.4 (Hypoplastic left heart syndrome) is billable and can be used for insurance claims. Always verify payer-specific requirements.

Q23.4 ✓ Billable

Hypoplastic left heart syndrome

Q: What is ICD-10 code Q23.4?

ICD-10-CM code Q23.4 stands for "Hypoplastic left heart syndrome". It is a billable code in the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Congenital Malformations, Deformations and Chromosomal Abnormalities

Code

Q23.4

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Congenital Malformations, Deformations and Chromosomal Abnormalities

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code Q23.4?

ICD-10-CM code Q23.4 represents Hypoplastic left heart syndrome. It is a billable diagnosis code in the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter, effective October 1, 2025 – September 30, 2026.

Is Q23.4 billable?

Yes. Q23.4 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is Q23.4 in?

Q23.4 belongs to the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter (Q00–Q99) of ICD-10-CM.

Related codes in the Q23 category

Q23 Congenital malformations of aortic and mitral valves Non-billable Q23.0 Congenital stenosis of aortic valve Billable Q23.1 Congenital insufficiency of aortic valve Billable Q23.2 Congenital mitral stenosis Billable Q23.3 Congenital mitral insufficiency Billable Q23.8 Other congenital malformations of aortic and mitral valves Non-billable Q23.9 Congenital malformation of aortic and mitral valves, unspecified Billable Q23.81 Bicuspid aortic valve Billable

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