ICD-10 Code
International Classification of Diseases, 10th Revision
Apr 22, 2019
  ICD-10 Code for Non-ST elevation (NSTEMI) myocardial infarction I21.4

I21.4 is a valid1 ICD 10 diagnosis code.

I21.4 is valid for submission for HIPAA-covered transactions.

Chapter 9 Diseases of the circulatory system (I00-I99)
Section I20-I25 Ischemic heart diseases (I20-I25)
Category I21 Acute myocardial infarction

• See below for any additional coding requirements that may be necessary.

• Check for any notations, inclusions and/or exclusions that are specific to this ICD 10 code before using

1 No additional coding requirements necessary.
Inclusion Term
  • Acute subendocardial myocardial infarction
  • Non-Q wave myocardial infarction NOS
  • Nontransmural myocardial infarction NOS
  • Type 1 non-ST elevation myocardial infarction
See also ICD 10 code for

Related Terms to “Non-ST elevation (NSTEMI) myocardial infarction”

  • Infarct, infarction
    • myocardium, myocardial(acute) (with stated duration of 4 weeks or less) - I21.9
      • non-Q wave - I21.4
      • non-ST elevation(NSTEMI) - I21.4
      • nontransmural - I21.4
    • nontransmural - I21.4
    • subendocardial(acute) (nontransmural) - I21.4
  • Necrosis, necrotic(ischemic)See also Gangrene
    • subendocardial(acute) - I21.4
See the ICD-10-CM Coding Guidelines.

Questions related to I21.4 Non-ST elevation (NSTEMI) myocardial infarction

When ICD 10 was implemented on October 1, 2015, it did not affect physicians', outpatient facilities', and hospital outpatient departments' use of CPT codes on Medicare Fee-For-Service claims. Providers should continue to use CPT codes to report these services.