ICD-10 Code I22.0 – Subsequent ST elevation (STEMI) myocardial infarction of anterior wall (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I22.0 – Subsequent ST elevation (STEMI) myocardial infarction of anterior wall
What it is
This code identifies a new ST-elevation myocardial infarction affecting the anterior wall that occurs soon after a recent acute myocardial infarction. Use it when documentation clearly indicates a subsequent, not initial, STEMI.
Clinical signs
Typical findings include acute ischemic chest pain, ECG evidence of ST elevation, and documentation of anterior wall involvement. Clinical features vary; refer to documentation for the infarct timing and location.
When to use this code
Use I22.0 when the record states a subsequent STEMI of the anterior wall after a recent MI, not simply a recurrent chest pain episode. It should be supported by provider documentation of a new infarction event and its wall location. Check documentation if the timing or relationship to the prior MI is unclear.
Do not use for
Do not use this code for the initial acute STEMI, old myocardial infarction, or unspecified chest pain. If the chart does not confirm a subsequent infarction, code the documented condition instead.
Coding tip
Verify that the record links the new infarction to a recent MI and specifies the anterior wall before assigning I22.0.