Insurance and Medical Coding Test Prep

Answer: B - The appropriate ICD-9 code for a diagnosis of a personal history of heart attacks is 412. A heart attack is technically known as a myocardial infarction, and code 412 (Old Myocardial Infarction)is used when the patient has experienced a past myocardial infarction, but is no longer presenting any symptoms. It is also used when the patient has a healed myocardial infarction. In either case, code 412 is the appropriate code.