2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Ischemic Heart Disease 410-414 > Acute Myocardial Infarction 410.* > 2008 ICD-9-CM Diagnosis 410.21 Acute myocardial infarction of inferolateral wall initial episode of care  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 410.21 can be accessed here. 410.21 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 410.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog.