Q20 ICD-10-CM Code: Congenital malformations of cardiac chambers and connections
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
Q20Congenital malformations of cardiac chambers and connections
ICD-10-CM diagnosis code · United States clinical modification
Where Q20 sits
- 1
Chapter 17
Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- 2
Section
Congenital malformations of the circulatory system (Q20-Q28)
- 3
Category Q20
Congenital malformations of cardiac chambers and connections
- 4
Code Q20
Congenital malformations of cardiac chambers and connections
Codes under Q20
Q20 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Q20.0Common arterial trunkQ20.1Double outlet right ventricleQ20.2Double outlet left ventricleQ20.3Discordant ventriculoarterial connectionQ20.4Double inlet ventricleQ20.5Discordant atrioventricular connectionQ20.6Isomerism of atrial appendagesQ20.8Other congenital malformations of cardiac chambers and connectionsQ20.9Congenital malformation of cardiac chambers and connections, unspecifiedNotes for this code
Inclusion terms
No inclusion terms are listed for Q20.
Code first
No “code first” instruction is listed for Q20.
Use additional code
No “use additional code” instruction is listed for Q20.
Excludes1
Conditions that should not be reported together with this code.
- dextrocardia with situs inversus (Q89.3)
- mirror-image atrial arrangement with situs inversus (Q89.3)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for Q20.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code Q20 mean?
Q20 is the FY 2027 U.S. ICD-10-CM code for “Congenital malformations of cardiac chambers and connections.”
Is Q20 a billable or specific ICD-10-CM code?
No. Q20 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is Q20 located in ICD-10-CM?
Q20 is listed in Chapter 17, Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1), within Congenital malformations of the circulatory system (Q20-Q28) (Q20–Q28), under category Q20, Congenital malformations of cardiac chambers and connections.
What coding notes are listed for Q20?
No inclusion terms are listed for Q20 in this reference record. No code-first instruction is listed. Excludes1 notes: dextrocardia with situs inversus (Q89.3); mirror-image atrial arrangement with situs inversus (Q89.3). No Excludes2 note is listed.