I21.19

✓ Billable

ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall

Diseases of the circulatory system (I00-I99)

Also Known As

Acute transmural myocardial infarction of inferior wallInferolateral transmural (Q wave) infarction (acute)Transmural (Q wave) infarction (acute) (of) diaphragmatic wallTransmural (Q wave) infarction (acute) (of) inferior (wall) NOS

⚠️ Excludes2

direct

May be coded together if both conditions coexist

• ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery (I21.21)

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Code Information

CodeI21.19

BillableYes

ParentI21.1

CategoryDiseases of the circulatory system (I00-I99)

Excludes10 rule(s)

Excludes21 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)