ICD-10-CM I22: Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

ICD-10-CM Diagnosis Code (2025)

Official Description for I22

Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

Coding Notes & Guidelines for I22

Includes Notes
  • acute myocardial infarction occurring within four weeks (28 days) of a previous acute myocardial infarction, regardless of site
  • cardiac infarction
  • coronary (artery) embolism
  • coronary (artery) occlusion
  • coronary (artery) rupture
  • coronary (artery) thrombosis
  • infarction of heart, myocardium, or ventricle
  • recurrent myocardial infarction
  • reinfarction of myocardium
  • rupture of heart, myocardium, or ventricle
  • subsequent type 1 myocardial infarction
Excludes1: Not Coded Here
  • subsequent myocardial infarction, type 2 (I21.A1)
  • subsequent myocardial infarction of other type (type 3) (type 4) (type 5) (I21.A9)
Use Additional Code
  • code, if applicable, to identify:
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)
Inclusion Terms
  • Subsequent acute transmural myocardial infarction of anterior wall
  • Subsequent transmural (Q wave) infarction (acute)(of) anterior (wall) NOS
  • Subsequent anteroapical transmural (Q wave) infarction (acute)
  • Subsequent anterolateral transmural (Q wave) infarction (acute)
  • Subsequent anteroseptal transmural (Q wave) infarction (acute)
Inclusion Terms
  • Subsequent acute transmural myocardial infarction of inferior wall
  • Subsequent transmural (Q wave) infarction (acute)(of) diaphragmatic wall
  • Subsequent transmural (Q wave) infarction (acute)(of) inferior (wall) NOS
  • Subsequent inferolateral transmural (Q wave) infarction (acute)
  • Subsequent inferoposterior transmural (Q wave) infarction (acute)
Inclusion Terms
  • Subsequent acute subendocardial myocardial infarction
  • Subsequent non-Q wave myocardial infarction NOS
  • Subsequent nontransmural myocardial infarction NOS
Inclusion Terms
  • Subsequent acute transmural myocardial infarction of other sites
  • Subsequent apical-lateral transmural (Q wave) myocardial infarction (acute)
  • Subsequent basal-lateral transmural (Q wave) myocardial infarction (acute)
  • Subsequent high lateral transmural (Q wave) myocardial infarction (acute)
  • Subsequent transmural (Q wave) myocardial infarction (acute)(of) lateral (wall) NOS
  • Subsequent posterior (true) transmural (Q wave) myocardial infarction (acute)
  • Subsequent posterobasal transmural (Q wave) myocardial infarction (acute)
  • Subsequent posterolateral transmural (Q wave) myocardial infarction (acute)
  • Subsequent posteroseptal transmural (Q wave) myocardial infarction (acute)
  • Subsequent septal NOS transmural (Q wave) myocardial infarction (acute)
Inclusion Terms
  • Subsequent acute myocardial infarction of unspecified site
  • Subsequent myocardial infarction (acute) NOS

Child Codes (More Specific Codes for I22):

I22.0 - Subsequent ST elevation (STEMI) myocardial infarction of anterior wall I22.1 - Subsequent ST elevation (STEMI) myocardial infarction of inferior wall I22.2 - Subsequent non-ST elevation (NSTEMI) myocardial infarction I22.8 - Subsequent ST elevation (STEMI) myocardial infarction of other sites I22.9 - Subsequent ST elevation (STEMI) myocardial infarction of unspecified site

About ICD-10-CM Code I22 (Subsequent ST elevation)

ICD-10-CM code I22 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM I22 became effective on October 1, 2024.

This page provides detailed information about I22 - Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Subsequent ST elevation.