ICD-10 Code
International Classification of Diseases, 10th Revision
Oct 21, 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 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 transmural myocardial infarction of unspecified site
  • Transmural (Q wave) myocardial infarction NOS
  • Type 1 ST elevation myocardial infarction of unspecified site
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) - I21.9
      • Q wave(see also, Infarct, myocardium, by site) - I21.3
      • ST elevation(STEMI) - I21.3
  • STEMI - I21.3See also - Infarct, myocardium, ST elevation
See the 2017 ICD-10-CM Coding Guidelines.

Questions related to I21.3 ST elevation (STEMI) myocardial infarction of unspecified site

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.