The code I21.09 will be given for the given case as it is for myocardial infarction.
The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) is a diagnosis code classification system that represents diseases and ailments, related health problems, abnormal findings, signs and symptoms, concussions, and external causes of injuries, among other things.
09 for ST elevation (STEMI) myocardial infarction involving many various coronary artery of anterior wall is a WHO medical classification under the range - Diseases of the circulatory system.
Thus the code for this will be 121.09.
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