I22.1

✓ Billable

Subsequent ST elevation (STEMI) myocardial infarction of inferior wall

Diseases of the circulatory system (I00-I99)

Also Known As

Subsequent acute transmural myocardial infarction of inferior wallSubsequent transmural (Q wave) infarction (acute)(of) diaphragmatic wallSubsequent transmural (Q wave) infarction (acute)(of) inferior (wall) NOSSubsequent inferolateral transmural (Q wave) infarction (acute)Subsequent inferoposterior transmural (Q wave) infarction (acute)

❌ Excludes1

inherited from I22

Rules from parent category I22: Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

• subsequent myocardial infarction, type 2 (I21.A1)
• subsequent myocardial infarction of other type (type 3) (type 4) (type 5) (I21.A9)

📋 Code Instructions

from I22

• 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)

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Code Information

CodeI22.1

BillableYes

ParentI22

CategoryDiseases of the circulatory system (I00-I99)

Excludes12 rule(s)

Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)