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ICD-10 Code I22.1: Subsequent ST elevation (STEMI) myocardial infarction of inferior wall

I22.1 is a billable ICD-10 diagnosis code used to classify Subsequent ST elevation (STEMI) myocardial infarction of inferior wall 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).

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).

đź“‹Clinical overview

This ICD-10 code is commonly used when documentation describes a subsequent myocardial infarction after a recent prior infarction. The most accurate code depends on whether the later infarction is STEMI versus NSTEMI and whether the site is anterior, inferior, other, or unspecified.

When is it used?

  • May be used when a clinician documents subsequent st elevation (stemi) myocardial infarction of inferior wall 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.

đź©şClinical context

When commonly used
  • Inpatient, cardiology, emergency, and utilization-review workflows where the chart documents a subsequent myocardial infarction rather than the first acute event.
  • Coding workflows where the record identifies subsequent STEMI versus subsequent NSTEMI and clarifies infarct territory, changing final code specificity.
Common management context
  • Evaluation often includes recurrent-ischemia symptom review, ECG interpretation, troponin testing, coronary-imaging or catheterization context, and acute cardiology management planning.
  • Documentation usually becomes more specific when the chart identifies subsequent STEMI versus NSTEMI and names anterior-wall, inferior-wall, other-site, or unspecified-site involvement.
  • Specialist context already linked on this page includes Cardiologist, General Physician.

🔍Key distinctions

Important notes
  • This ICD-10 family captures a subsequent myocardial infarction rather than the initial acute myocardial infarction itself.
  • Subsequent STEMI versus NSTEMI pattern and infarct territory are what drive final code specificity inside this family.
  • Subsequent STEMI is coded separately from subsequent NSTEMI within this follow-on myocardial-infarction family.
  • Subsequent inferior-wall STEMI is coded separately from anterior-wall, other-site, and unspecified-site subsequent infarction patterns.
  • Documentation that describes a subsequent myocardial infarction is coded differently from the initial acute myocardial infarction, chronic ischemic heart disease, or a remote healed prior infarction.
Related codes to consider
I22.0Subsequent ST elevation (STEMI) myocardial infarction of anterior wall
Related subsequent-myocardial-infarction ICD-10 code; documentation often becomes more specific when the chart identifies subsequent STEMI versus NSTEMI, infarct territory, or distinguishes the follow-on infarction from the initial acute event.
I22.2Subsequent non-ST elevation (NSTEMI) myocardial infarction
Related subsequent-myocardial-infarction ICD-10 code; documentation often becomes more specific when the chart identifies subsequent STEMI versus NSTEMI, infarct territory, or distinguishes the follow-on infarction from the initial acute event.
I22.8Subsequent ST elevation (STEMI) myocardial infarction of other sites
Related subsequent-myocardial-infarction ICD-10 code; documentation often becomes more specific when the chart identifies subsequent STEMI versus NSTEMI, infarct territory, or distinguishes the follow-on infarction from the initial acute event.
I22.9Subsequent ST elevation (STEMI) myocardial infarction of unspecified site
Related subsequent-myocardial-infarction ICD-10 code; documentation often becomes more specific when the chart identifies subsequent STEMI versus NSTEMI, infarct territory, or distinguishes the follow-on infarction from the initial acute event.

Code hierarchy

chapter
9Diseases of the circulatory system (I00-I99)
block
I20-I25Ischemic heart diseases
category
I22Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
currentI22

Official coding notes

Inclusion terms
  • Subsequent acute transmural myocardial infarction of inferior wall
  • Subsequent transmural (Q wave) infarction (acute)(of) diaphragmatic wall
  • Subsequent transmural (Q wave) infarction (acute)(of) inferior (wall) NOS
  • Subsequent inferolateral transmural (Q wave) infarction (acute)
  • Subsequent inferoposterior transmural (Q wave) infarction (acute)

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

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
I22.1

Common synonyms

Subsequent ST elevation (STEMI) myocardial infarction of inferior wallSubsequent ST elevationSubsequent ST elevation STEMI myocardial infarction of inferior wall

Frequently asked questions

Code details

CodeI22.1
SystemICD10
Display nameSubsequent ST elevation (STEMI) myocardial infarction of inferior wall
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, 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.