Convert ICD-10 Code I21.A1 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
I21.A1 Myocardial infarction type 2		410.90 AMI NOS, unspecified
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.
I21.A1 Myocardial infarction type 2		410.91 AMI NOS, initial
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.
I21.A1 Myocardial infarction type 2		410.92 AMI NOS, subsequent
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

ICD-10 to ICD-9 crosswalk for code I21.A1 - myocardial infarction type 2 based on the most recent General Equivalence Mappings (GEMS) information.