ICD-10-CM Q20: Congenital malformations of cardiac chambers and connections

ICD-10-CM Diagnosis Code (2025)

Official Description for Q20

Congenital malformations of cardiac chambers and connections

Coding Notes & Guidelines for Q20

Excludes1: Not Coded Here
  • dextrocardia with situs inversus (Q89.3)
  • mirror-image atrial arrangement with situs inversus (Q89.3)
Excludes1: Not Coded Here

aortic septal defect (Q21.4)

Inclusion Terms

Persistent truncus arteriosus

Inclusion Terms

Taussig-Bing syndrome

Inclusion Terms
  • Dextrotransposition of aorta
  • Transposition of great vessels (complete)
Inclusion Terms
  • Common ventricle
  • Cor triloculare biatriatum
  • Single ventricle
Inclusion Terms
  • Corrected transposition
  • Levotransposition
  • Ventricular inversion
Inclusion Terms

Isomerism of atrial appendages with asplenia or polysplenia

Inclusion Terms

Cor binoculare

Child Codes (More Specific Codes for Q20):

Q20.0 - Common arterial trunk Q20.1 - Double outlet right ventricle Q20.2 - Double outlet left ventricle Q20.3 - Discordant ventriculoarterial connection Q20.4 - Double inlet ventricle Q20.5 - Discordant atrioventricular connection Q20.6 - Isomerism of atrial appendages Q20.8 - Other congenital malformations of cardiac chambers and connections Q20.9 - Congenital malformation of cardiac chambers and connections, unspecified

About ICD-10-CM Code Q20 (Congenital malformations of cardiac chambers and connections)

ICD-10-CM code Q20 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM Q20 became effective on October 1, 2024.

This page provides detailed information about Q20 - Congenital malformations of cardiac chambers and connections. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Congenital malformations of cardiac chambers and connections.