Q23 – Congenital malformations of aortic and mitral valves
ICD-10-CM 2027 diagnosis code · Congenital malformations of the circulatory system
ICD-10-CM code
Q23
- Code
Q23(claims format:Q23)- Description
- Congenital malformations of aortic and mitral valves
- Billable
- No – use a more specific code below
- 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
Billable codes under Q23
Q23 is a header code and cannot be used on claims. Choose the most specific code:
- Q23.0 – Congenital stenosis of aortic valveBillable
- Q23.1 – Congenital insufficiency of aortic valveBillable
- Q23.2 – Congenital mitral stenosisBillable
- Q23.3 – Congenital mitral insufficiencyBillable
- Q23.4 – Hypoplastic left heart syndromeBillable
- Q23.8 – Other congenital malformations of aortic and mitral valvesHeader (more codes below)
- Q23.9 – Congenital malformation of aortic and mitral valves, unspecifiedBillable
Frequently asked questions
What is ICD-10 code Q23?
Q23 is the ICD-10-CM code for congenital malformations of aortic and mitral valves, in the block Q20-Q28 (Congenital malformations of the circulatory system).
Is Q23 a billable code?
No. Q23 is a header code with more specific child codes; report one of the billable codes listed above.
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.