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Q23.4

Hypoplastic left heart syndrome

Billable FY2026 2025-10-01 → 2026-09-30
Instructional notes

No further instructional notes apply.

Index entries leading here 4
  • Hypoplasia, hypoplastic
    • aorta, aortic Q25.42
      • valve Q23.1
        • in hypoplastic left heart syndrome Q23.4
      • ascending, in hypoplastic left heart syndrome Q23.4
    • left heart syndrome Q23.4
  • Atresia, atretic
    • aortic (orifice) (valve) Q23.0
      • congenital with hypoplasia of ascending aorta and defective development of left ventricle (with mitral stenosis) Q23.4
      • in hypoplastic left heart syndrome Q23.4
    • mitral valve Q23.2
      • in hypoplastic left heart syndrome Q23.4
  • Development
    • defective, congenital — see also Anomaly, by site
      • left ventricle Q24.8
        • in hypoplastic left heart syndrome Q23.4
  • Syndrome — see also Disease
    • hypoplastic left-heart Q23.4
Alongside this code 6 same parent — Q23
Q23.0 Congenital stenosis of aortic valve Q23.1 Congenital insufficiency of aortic valve Q23.2 Congenital mitral stenosis Q23.3 Congenital mitral insufficiency Q23.8 Other congenital malformations of aortic and mitral valves category Q23.9 Congenital malformation of aortic and mitral valves, unsp
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

RX08HCC191

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This code

Billable
yes
Code set
FY2026
Parent
Q23
Block
Q20-Q28
Siblings
6

Present FY2024–FY2027.