Q23.4 – Hypoplastic left heart syndrome
ICD-10-CM 2027 diagnosis code · Congenital malformations of the circulatory system
ICD-10-CM code
Q23.4
- Code
Q23.4(claims format:Q234)- Description
- Hypoplastic left heart syndrome
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- Block
- Q20-Q28 Congenital malformations of the circulatory system
- Parent codes
- Q23
Index terms for Q23.4
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Syndrome, hypoplastic left-heart
- Hypoplasia, hypoplastic, left heart syndrome
- Atresia, atretic, aortic, in hypoplastic left heart syndrome
- Atresia, atretic, mitral valve, in hypoplastic left heart syndrome
- Hypoplasia, hypoplastic, aorta, aortic, valve, in hypoplastic left heart syndrome
- Development, defective, congenital, left ventricle, in hypoplastic left heart syndrome
- Hypoplasia, hypoplastic, aorta, aortic, ascending, in hypoplastic left heart syndrome
- Atresia, atretic, aortic, congenital with hypoplasia of ascending aorta and defective development of left ventricle
Related codes in Q23
- Q23.0 – Congenital stenosis of aortic valveBillable
- Q23.1 – Congenital insufficiency of aortic valveBillable
- Q23.2 – Congenital mitral stenosisBillable
- Q23.3 – Congenital mitral insufficiencyBillable
- Q23.8 – Other congenital malformations of aortic and mitral valvesHeader
- Q23.9 – Congenital malformation of aortic and mitral valves, unspecifiedBillable
Frequently asked questions
What is ICD-10 code Q23.4?
Q23.4 is the ICD-10-CM code for hypoplastic left heart syndrome, in the block Q20-Q28 (Congenital malformations of the circulatory system).
Is Q23.4 a billable code?
Yes. Q23.4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does Q23.4 belong to?
It belongs to category Q23 – Congenital malformations of aortic and mitral valves.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.