Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Congenital malformations of the circulatory system (Q20-Q28)
Q20: Congenital malformations of cardiac chambers and connections
Q21: Congenital malformations of cardiac septa
Q22: Congenital malformations of pulmonary and tricuspid valves
Q23: Congenital malformations of aortic and mitral valves
Q24: Other congenital malformations of heart
Q25: Congenital malformations of great arteries
Q26: Congenital malformations of great veins
Q27: Other congenital malformations of peripheral vascular system
Q28: Other congenital malformations of circulatory system
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