ICD-10-CM>Q00-QA1>Q20-Q28>Q21>Q21.2Q21.2Atrioventricular septal defectNon-Billable/Non-SpecificApplicable ToAtrioventricular canal defectEndocardial cushion defectOstium primum atrial septal defect (type I)CodesQ21.20Atrioventricular septal defect, unspecified as to partial or completeQ21.21Partial atrioventricular septal defectQ21.22Transitional atrioventricular septal defectQ21.23Complete atrioventricular septal defect