Q20 – Congenital malformations of cardiac chambers and connections
ICD-10-CM 2027 diagnosis code · Congenital malformations of the circulatory system
ICD-10-CM code
Q20
- Code
Q20(claims format:Q20)- Description
- Congenital malformations of cardiac chambers and connections
- 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 Q20
Q20 is a header code and cannot be used on claims. Choose the most specific code:
- Q20.0 – Common arterial trunkBillable
- Q20.1 – Double outlet right ventricleBillable
- Q20.2 – Double outlet left ventricleBillable
- Q20.3 – Discordant ventriculoarterial connectionBillable
- Q20.4 – Double inlet ventricleBillable
- Q20.5 – Discordant atrioventricular connectionBillable
- Q20.6 – Isomerism of atrial appendagesBillable
- Q20.8 – Other congenital malformations of cardiac chambers and connectionsBillable
- Q20.9 – Congenital malformation of cardiac chambers and connections, unspecifiedBillable
Notes for Q20
Frequently asked questions
What is ICD-10 code Q20?
Q20 is the ICD-10-CM code for congenital malformations of cardiac chambers and connections, in the block Q20-Q28 (Congenital malformations of the circulatory system).
Is Q20 a billable code?
No. Q20 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.