From parent levels

ChapterXVIICongenital malformations, deformations and chromosomal abnormalitiesOpen

Exclusions

inborn errors of metabolism (E70-E90)

BlockQ20-Q28Congenital malformations of the circulatory systemOpen

CategoryQ21Congenital malformations of cardiac septaOpen

Exclusions

acquired cardiac septal defect (I51.0)

Q21.2

CategoryBlock Q20-Q28 Chapter XVII

Atrioventricular septal defect

Inclusions

Common atrioventricular canal
Endocardial cushion defect
Ostium primum atrial septal defect (type I)

Parent: Q21 Congenital malformations of cardiac septa