Convert ICD-10 Code Q21.1 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
Q21.1 Atrial septal defect		745.5 Secundum atrial sept def

ICD-10 to ICD-9 crosswalk for code Q21.1 - atrial septal defect based on the most recent General Equivalence Mappings (GEMS) information.