Q23.8 – Other congenital malformations of aortic and mitral valves

ICD-10-CM 2027 diagnosis code · Congenital malformations of the circulatory system

Non-billable header

ICD-10-CM code Q23.8

Code: Q23.8 (claims format: Q238)
Description: Other 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
Parent codes: Q23

Billable codes under Q23.8

Q23.8 is a header code and cannot be used on claims. Choose the most specific code:

Q23.81 – Bicuspid aortic valveBillable
Q23.82 – Congenital mitral valve cleft leafletBillable
Q23.88 – Other congenital malformations of aortic and mitral valvesBillable

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
Q23.4 – Hypoplastic left heart syndromeBillable
Q23.9 – Congenital malformation of aortic and mitral valves, unspecifiedBillable

Frequently asked questions

What is ICD-10 code Q23.8?

Q23.8 is the ICD-10-CM code for other congenital malformations of aortic and mitral valves, in the block Q20-Q28 (Congenital malformations of the circulatory system).

Is Q23.8 a billable code?

No. Q23.8 is a header code with more specific child codes; report one of the billable codes listed above.

What category does Q23.8 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.