ICD-10 Code
International Classification of Diseases, 10th Revision
Aug 19, 2017
  ICD-10 Code for ST elevation (STEMI) myocardial infarction of unspecified site I21.3

I21.3 is a valid1 ICD 10 diagnosis code.

I21.3 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 ST elevation (STEMI) and non-ST elevation (NSTEMI) 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 transmural myocardial infarction of unspecified site
  • Myocardial infarction (acute) NOS
  • Transmural (Q wave) myocardial infarction NOS
See also ICD 10 code for

Related Terms to “ST elevation (STEMI) myocardial infarction of unspecified site”

  • Infarct, infarction
    • myocardium, myocardial(acute) (with stated duration of 4 weeks or less) - I21.3
      • Q wave(see also, Infarct, myocardium, by site) - I21.3
      • ST elevation(STEMI) - I21.3
      • transmural - I21.3
  • STEMI - I21.3See also - Infarct, myocardium, ST elevation
See the 2017 ICD-10-CM Coding Guidelines.

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.