 
| ICD-10-CM-2023 > Q00-Q99 > Q20-Q28 > Q21 | 
| Q20-Q28 | Congenital malformations of the circulatory system | |
| Q21 | Congenital malformations of cardiac septa | |
| Excl1.: | acquired cardiac septal defect (I51.0) | |
| Q21.0 | Ventricular septal defect | |
| Info: | Roger's disease | |
| Q21.1 | Atrial septal defect | |
| Info: | Excludes 2: ostium primum atrial septal defect (type I) (Q21.20) | |
| Q21.10 | Atrial septal defect, unspecified | |
| Q21.11 | Secundum atrial septal defect | |
| Info: | Fenestrated atrial septum Patent or persistent ostium secundum defect (type II) | |
| Q21.12 | Patent foramen ovale | |
| Info: | Persistent foramen ovale | |
| Q21.13 | Coronary sinus atrial septal defect | |
| Info: | Coronary sinus defect Unroofed coronary sinus | |
| Q21.14 | Superior sinus venosus atrial septal defect | |
| Info: | Superior vena cava type atrial septal defect | |
| Q21.15 | Inferior sinus venosus atrial septal defect | |
| Info: | Inferior vena cava type atrial septal defect | |
| Q21.16 | Sinus venosus atrial septal defect, unspecified | |
| Info: | Sinus venosus defect, NOS | |
| Q21.19 | Other specified atrial septal defect | |
| Info: | Common atrium Other specified atrial septal abnormality | |
| Q21.2 | Atrioventricular septal defect | |
| Info: | Atrioventricular canal defect Endocardial cushion defect Ostium primum atrial septal defect (type I) | |
| Q21.20 | Atrioventricular septal defect, unspecified as to partial or complete | |
| Info: | Atrioventricular canal, NOS Endocardial cushion defect NOS Ostium primum atrial septal defect (type I) NOS | |
| Q21.21 | Partial atrioventricular septal defect | |
| Info: | Incomplete atrioventricular canal Incomplete atrioventricular septal defect Incomplete endocardial cushion defect Ostium primum atrial septal defect (type I) with separate atrioventricular valves Partial atrioventricular canal Partial endocardial cushion defect | |
| Q21.22 | Transitional atrioventricular septal defect | |
| Info: | Intermediate atrioventricular canal Intermediate atrioventricular septal defect Intermediate endocardial cushion defect Ostium primum atrial septal defect (type I) with separate atrioventricular valves and a small or restrictive inlet VSD Transitional atrioventricular canal Transitional endocardial cushion defect | |
| Q21.23 | Complete atrioventricular septal defect | |
| Info: | Common atrioventricular canal Common atrioventricular septal defect Common endocardial cushion defect Ostium primum atrial septal defect (type I) with common atrioventricular valve and a moderate or larger inlet VSD | |
| Q21.3 | Tetralogy of Fallot | |
| Info: | Ventricular septal defect with pulmonary stenosis or atresia, dextroposition of aorta and hypertrophy of right ventricle. | |
| Q21.4 | Aortopulmonary septal defect | |
| Info: | Aortic septal defect Aortopulmonary window | |
| Q21.8 | Other congenital malformations of cardiac septa | |
| Info: | Eisenmenger's defect Pentalogy of Fallot | |
| Use add'l | , if applicable: Eisenmenger's complex (I27.83) Eisenmenger's syndrome (I27.83) | |
| Q21.9 | Congenital malformation of cardiac septum, unspecified | |
| Info: | Septal (heart) defect NOS | |
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