Q23
⚠ Non-billable
Congenital malformations of aortic and mitral valves
ICD-10-CM · FY2026 · Congenital Malformations, Deformations and Chromosomal Abnormalities
Code
Q23
System
ICD-10-CM
Billable
No — use specific code
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?
ICD-10-CM code Q23 represents Congenital malformations of aortic and mitral valves. It is a non-billable header code requiring a more specific subcategory in the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter, effective October 1, 2025 – September 30, 2026.
Is Q23 billable?
No. Q23 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is Q23 in?
Q23 belongs to the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter (Q00–Q99) of ICD-10-CM.
Related codes in the Q23 category
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
Q23.4
Hypoplastic left heart syndrome
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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