AHA Coding Clinic® for ICD-9 - 2005 Issue 4; VOLUMES 1 AND 2 NEW/REVISED CODES

ST Elevation and Non-ST Elevation Myocardial Infarction

Effective October 1, 2005, inclusion terms have been added to category 410, Acute myocardial infarction, to clarify that these codes apply to ST-segment elevation myocardial infarction (STEMI), as well as non-ST segment elevation myocardial infarction (NSTEMI). Myocardial infarctions that show an ST segment change on electrocardiogram (ECG) are referred to as ST elevation myocardial infarctions (STEMI), and generally involve the whole thickness of myocardium from epicardium to endocardium. Myocardial infarctions that do not show an ST segment change on ECG are referred to as non-ST elevation myocardial infarctions (NSTEMI), and generally do not involve the whole thickness of myocardium...

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