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Q23.1 — Congenital insufficiency of aortic valve
Q23.1
What this code means
A congenital bicuspid aortic valve has two leaflets instead of the usual three, and can narrow or leak over time.
Also called: bicuspid aortic valve, bav.
When this code is used
Used for congenital bicuspid aortic valve.
Where it sits in ICD-10-CM
Code Q23.1 belongs to Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders, which covers codes Q00–QA1 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code Q23.1?
Q23.1 is the ICD-10-CM diagnosis code for “Congenital insufficiency of aortic valve”. A congenital bicuspid aortic valve has two leaflets instead of the usual three, and can narrow or leak over time.
When is code Q23.1 used?
Used for congenital bicuspid aortic valve. It belongs to Chapter 17 of ICD-10-CM (Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.