Q20: Congenital malformations of cardiac chambers and connections
Codes under Q20 (Congenital malformations of cardiac chambers and connections). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| Q20.0 | Common arterial trunk | ✓ |
| Q20.0 | Common arterial trunk | ✓ |
| Q20.1 | Double outlet right ventricle | ✓ |
| Q20.1 | Double outlet right ventricle | ✓ |
| Q20.2 | Double outlet left ventricle | ✓ |
| Q20.2 | Double outlet left ventricle | ✓ |
| Q20.3 | Discordant ventriculoarterial connection | ✓ |
| Q20.3 | Discordant ventriculoarterial connection | ✓ |
| Q20.4 | Double inlet ventricle | ✓ |
| Q20.4 | Double inlet ventricle | ✓ |
| Q20.5 | Discordant atrioventricular connection | ✓ |
| Q20.5 | Discordant atrioventricular connection | ✓ |
| Q20.6 | Isomerism of atrial appendages | ✓ |
| Q20.6 | Isomerism of atrial appendages | ✓ |
| Q20.8 | Other congenital malformations of cardiac chambers and connections | ✓ |
| Q20.8 | Other congenital malformations of cardiac chambers and connections | ✓ |
| Q20.9 | Congenital malformation of cardiac chambers and connections, unspecified | ✓ |
| Q20.9 | Congenital malformation of cardiac chambers and connections, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code Q20?
Q20 is an ICD-10-CM category covering Congenital malformations of cardiac chambers and connections. It contains 18 more specific diagnosis codes, 18 of which are billable.
Is Q20 a billable code?
No — Q20 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example Q20.0 — Common arterial trunk). 18 of the 18 codes under Q20 are billable.
What codes fall under Q20?
Q20 includes Q20.0, Q20.0, Q20.1, Q20.1, Q20.2, plus 13 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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