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ICD-10 Code I21.29: ST elevation (STEMI) myocardial infarction involving other sites

I21.29 is a billable ICD-10 diagnosis code used to classify ST elevation (STEMI) myocardial infarction involving other sites in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

When is it used?

  • May be used when a clinician documents st elevation (stemi) myocardial infarction involving other sites in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
9Diseases of the circulatory system (I00-I99)
block
I20-I25Ischemic heart diseases
category
I21Acute myocardial infarction
category
I21.2ST elevation (STEMI) myocardial infarction of other sites
currentI21.2

Official coding notes

Inclusion terms
  • Acute transmural myocardial infarction of other sites
  • Apical-lateral transmural (Q wave) infarction (acute)
  • Basal-lateral transmural (Q wave) infarction (acute)
  • High lateral transmural (Q wave) infarction (acute)
  • Lateral (wall) NOS transmural (Q wave) infarction (acute)
  • Posterior (true) transmural (Q wave) infarction (acute)
  • Posterobasal transmural (Q wave) infarction (acute)
  • Posterolateral transmural (Q wave) infarction (acute)
  • Posteroseptal transmural (Q wave) infarction (acute)
  • Septal transmural (Q wave) infarction (acute) NOS

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

CardiologistGeneral Physician

Coverage-related procedures and services

CPT 93350high
ECHOCARDIOGRAPHY, TRANSTHORACIC, REAL-TIME WITH IMAGE DOCUMENTATION (2D), INCLUDES M-MODE RECORDING, WHEN PERFORMED, DURING REST AND CARDIOVASCULAR STRESS TEST USING TREADMILL, BICYCLE EXERCISE AND/OR PHARMACOLOGICALLY INDUCED STRESS, WITH INTERPRETATION AND REPORT;
Source: CMS coverage guidance
CPT 93351high
ECHOCARDIOGRAPHY, TRANSTHORACIC, REAL-TIME WITH IMAGE DOCUMENTATION (2D), INCLUDES M-MODE RECORDING, WHEN PERFORMED, DURING REST AND CARDIOVASCULAR STRESS TEST USING TREADMILL, BICYCLE EXERCISE AND/OR PHARMACOLOGICALLY INDUCED STRESS, WITH INTERPRETATION AND REPORT; INCLUDING PERFORMANCE OF CONTINUOUS ELECTROCARDIOGRAPHIC MONITORING, WITH SUPERVISION BY A PHYSICIAN OR OTHER QUALIFIED HEALTH CARE PROFESSIONAL
Source: CMS coverage guidance
CPT 93241high
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR MORE THAN 48 HOURS UP TO 7 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; INCLUDES RECORDING, SCANNING ANALYSIS WITH REPORT, REVIEW AND INTERPRETATION
Source: CMS coverage guidance
CPT 93242high
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR MORE THAN 48 HOURS UP TO 7 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; RECORDING (INCLUDES CONNECTION AND INITIAL RECORDING)
Source: CMS coverage guidance
CPT 93244high
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR MORE THAN 48 HOURS UP TO 7 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; REVIEW AND INTERPRETATION
Source: CMS coverage guidance
CPT 93243high
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR MORE THAN 48 HOURS UP TO 7 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; SCANNING ANALYSIS WITH REPORT
Source: CMS coverage guidance

Coding guidelines

Common synonyms

ST elevation (STEMI) myocardial infarction involving other sitesST elevationST elevation STEMI myocardial infarction involving other sites

Frequently asked questions

Code details

CodeI21.29
SystemICD10
Display nameST elevation (STEMI) myocardial infarction involving other sites
ChapterDiseases of the circulatory system (I00-I99)
BlockIschemic heart diseases

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Infarct, infarctionInfarct, infarctionInfarct, infarctionInfarct, infarctionInfarct, infarctionInfarct, infarctionInfarct, infarctionInfarct, infarction

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code I21.29 for ST elevation (STEMI) myocardial infarction involving other sites | HealthAssure