STEMI involving oth coronary artery of anterior wall

This code signifies an acute myocardial infarction characterized by ST-segment elevation on an electrocardiogram, specifically affecting the anterior wall of the heart due to an occlusion in a coronary artery other than the left anterior descending (LAD). This indicates a severe and emergent form of heart attack requiring immediate intervention.

Apply this code when documentation confirms an acute STEMI, with ECG findings showing ST elevation in anterior leads, and the interventional cardiologist or diagnostic reports identify the culprit lesion in a non-LAD coronary artery supplying the anterior wall. This typically occurs in the context of an emergency department presentation or hospital admission for acute chest pain.

• Ensure documentation clearly specifies "anterior wall" involvement and identifies the occluded coronary artery as "other" than the LAD.
• Distinguish from STEMIs involving the LAD (I21.01) or inferior/posterior walls.
• Sequence as the principal diagnosis when the STEMI is the reason for admission.