2025
ICD-10-CM
Diagnosis
Code

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

  • Billable
  • 2016–2025

I21.3 is a billable/specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: ST elevation (STEMI) myocardial infarction of unspecified site.

Inclusion term

  • Acute transmural myocardial infarction of unspecified site

  • Transmural (Q wave) myocardial infarction NOS

  • Type 1 ST elevation myocardial infarction of unspecified site

Versions

  1. 2025

    No changes

  2. 2024

    No changes

  3. 2023

    No changes

  4. 2022

    No changes

  5. 2021

    No changes

  6. 2020

    No changes

  7. 2019

    No changes

  8. 2018

    Code changed

    • Inclusion term

        • Acute transmural myocardial infarction of unspecified site
        • Myocardial infarction (acute) NOS
        • Transmural (Q wave) myocardial infarction NOS
        • Acute transmural myocardial infarction of unspecified site
        • Transmural (Q wave) myocardial infarction NOS
        • Type 1 ST elevation myocardial infarction of unspecified site

  9. 2017

    No changes

  10. 2016

    New code