I21.19
Billable codeST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
The ICD-10 code for st elevation (stemi) myocardial infarction involving other coronary artery of inferior wall is I21.19.
Clinical notes
Excludes2 (not included here)
An Excludes2 note means the excluded condition is not part of this one, but a patient can have both at the same time — in that case both codes may be reported together.
- ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery (I21.21)
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Acute transmural myocardial infarction of inferior wall
- Inferolateral transmural (Q wave) infarction (acute)
- Transmural (Q wave) infarction (acute) (of) diaphragmatic wall
- Transmural (Q wave) infarction (acute) (of) inferior (wall) NOS
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •Laterality-specific codes exist for this condition — confirm the affected side is documented.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- I21.11ST elevation (STEMI) myocardial infarction involving right coronary artery
- I21.19ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 41021Approximate match
- 41041Approximate match
- 41020Approximate match
- 41022Approximate match
- 41040Approximate match
- 41042Approximate match
Associated MS-DRGs
I21.19 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.
- DRG 205Other Respiratory System Diagnoses with MCC
- DRG 206Other Respiratory System Diagnoses without MCC
- DRG 280Acute Myocardial Infarction, Discharged Alive with MCC
- DRG 281Acute Myocardial Infarction, Discharged Alive with CC
- DRG 282Acute Myocardial Infarction, Discharged Alive without CC/MCC
- DRG 283Acute Myocardial Infarction, Expired with MCC
- DRG 284Acute Myocardial Infarction, Expired with CC
- DRG 285Acute Myocardial Infarction, Expired without CC/MCC