ICD-10-CM > I00-I99 > I30-I5A > I51 > I51.0 I51.0 Cardiac septal defect, acquired Billable/Specific Copy Code Copy Description Applicable To Acquired septal atrial defect (old)Acquired septal auricular defect (old)Acquired septal ventricular defect (old) Type 1 Excludes cardiac septal defect as current complication following acute myocardial infarction (I23.1, I23.2)