Old or healed MIs not requiring further care should be coded to I25.2, Old myocardial infarction. For encounters after the 4-week timeframe and the patient is still receiving care related to the MI, the appropriate aftercare code should be assigned instead of a code from I21. For encounters occurring while the MI is equal to or less than 4 weeks old, including transfers to another acute or postacute setting, and the MI meets the definition for “other diagnoses”, codes from category I21 may continue to be reported.If a type 1 STEMI converts to NSTEMI due to thrombolytic therapy, it is still coded as STEMI.If a type 1 NSTEMI evolves to STEMI, assign the STEMI code.Code I21.A9 is used for types 3, 4a, 4b, 4c, and 5 MI.Code I21.9 is used for unspecified AMI or unspecified type.Code I21.4 is used for type 1 NSTEMI MI and nontransmural MIs.If the provider documents acute MI but does not include the specific location, the appropriate code is to assign is I21.3.
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