2025 ICD-10-CM Diagnosis Code I21.09

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

  • I21.09 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: STEMI involving oth coronary artery of anterior wall
  • The 2025 edition of ICD-10-CM I21.09 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I21.09 – other international versions of ICD-10 I21.09 may differ.

Applicable To

  • Acute transmural myocardial infarction of anterior wall
  • Anteroapical transmural (Q wave) infarction (acute)
  • Anterolateral transmural (Q wave) infarction (acute)
  • Anteroseptal transmural (Q wave) infarction (acute)
  • Transmural (Q wave) infarction (acute) (of) anterior (wall) NOS

The following code(s) above I21.09 contain annotation back-references

 that may be applicable to I21.09:

  • I00-I99  Diseases of the circulatory system
  • I20-I25  Ischemic heart diseases
  • I21  Acute myocardial infarction
  • I21.0  ST elevation (STEMI) myocardial infarction of anterior wall

Approximate Synonyms

  • Acute anterior st segment elevation myocardial infarction
  • Acute anteroseptal myocardial infarction
  • Acute heart attack, anterior wall
  • Acute heart attack, anteroapical
  • Acute heart attack, anterolateral wall
  • Acute heart attack, anteroseptal
  • Acute myocardial infarction of anterior wall
  • Acute myocardial infarction of anterolateral wall
  • Acute st segment elevation myocardial infarction of anterior wall
  • Acute st segment elevation myocardial infarction of anteroapical wall
  • Acute st segment elevation myocardial infarction of anterolateral wall
  • Acute st segment elevation myocardial infarction of anteroseptal wall
  • Heart attack, acute, anterior wall
  • Heart attack, acute, anterolateral wall
  • Myocardial infarction (heart attack), anteroseptal

ICD-10-CM I21.09 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 280 Acute myocardial infarction, discharged alive with mcc
  • 281 Acute myocardial infarction, discharged alive with cc
  • 282 Acute myocardial infarction, discharged alive without cc/mcc
  • 283 Acute myocardial infarction, expired with mcc
  • 284 Acute myocardial infarction, expired with cc
  • 285 Acute myocardial infarction, expired without cc/mcc

Convert I21.09 to ICD-9-CMCode History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Diagnosis Index entries containing back-references to I21.09:

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