Subsequent STEMI of inferior wall

This code signifies a patient experiencing a new ST-elevation myocardial infarction (STEMI) of the inferior wall, occurring within four weeks of a previous myocardial infarction. It indicates a recurrent ischemic event affecting the lower portion of the heart muscle, distinct from the initial MI.

Apply this code when documentation clearly states a subsequent STEMI of the inferior wall, and the onset is within 28 days of a prior MI. This requires physician documentation specifying "subsequent MI," "recurrent MI," or similar language, along with the specific location (inferior wall) and type (STEMI).

• Always sequence this code after the code for the initial myocardial infarction (I21.-) if the patient is still within the 28-day window.
• Distinguish carefully between a subsequent MI (I22.-) and an initial MI (I21.-) or an old MI (I25.2).
• Ensure the documentation specifies "inferior wall" and "STEMI" for accurate code assignment; otherwise, a more general subsequent MI code may be necessary.