ICD-10 / XVII Congenital malformations, deformations and chromosomal abnormalities / Q20-Q28 Congenital malformations of the circulatory system / Q21 Congenital malformations of cardiac septaFrom parent levelsChapterXVIICongenital malformations, deformations and chromosomal abnormalitiesexc.OpenExclusionsinborn errors of metabolism (E70-E90)BlockQ20-Q28Congenital malformations of the circulatory systemOpenQ21CategoryBlock Q20-Q28Chapter XVIICongenital malformations of cardiac septaExclusionsacquired cardiac septal defect (I51.0)Subcategories