Congenital malformations of the circulatory system (Q20-Q28)
Q21: Congenital malformations of cardiac septa

acquired cardiac septal defect (I51.0)
Q21.0: Ventricular septal defect
Q21.1: Atrial septal defect
Q21.2: Atrioventricular septal defect
Q21.3: Tetralogy of Fallot
Q21.4: Aortopulmonary septal defect
Q21.8: Other congenital malformations of cardiac septa
Q21.9: Congenital malformation of cardiac septum, unspecified

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