ICD-10-CM>Q00-QA1>Q20-Q28>Q21>Q21.2>Q21.20Q21.20Atrioventricular septal defect, unspecified as to partial or completeBillable/Specific Copy Code Copy DescriptionApplicable ToAtrioventricular canal, NOSEndocardial cushion defect NOSOstium primum atrial septal defect (type I) NOS