ICD-10-CM Code For Other Acute Ischemic Heart Diseases: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group I24 includes acute ischemic heart conditions other than acute myocardial infarction, such as unstable angina and other acute ischemic disorders of the heart. These ICD-10-CM diagnosis codes are used to document acute ischemic presentations, capturing disease acuity, clinical complexity, and cardiac involvement relevant to this group. Accurate coding within the ICD-10-CM I24 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM I24: Other Acute Ischemic Heart Diseases Overview

The diagnoses in this group represent acute ischemic conditions of the heart other than acute myocardial infarction, involving impaired coronary blood flow and acute ischemia. They target the cardiovascular system and include unstable ischemic presentations that require accurate clinical documentation. Precise coding in this group matters for appropriate claim adjudication and reflecting clinical severity.

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ICD-10-CM Code For Other Acute Ischemic Heart Diseases: Group Overview

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ICD-10-CM I24: Other Acute Ischemic Heart Diseases Overview

When to Use

Use a code from this group when a clinician documents an acute ischemic cardiac condition such as unstable angina or other acute ischemic presentations without evidence of myocardial infarction. Choose the most specific code that reflects the clinical diagnosis, acuity, and any documented complications or related findings.

ICD-10-CM Codes

5 rows

ICD-10-CM Code	Description
I24.0	Acute coronary thrombosis not resulting in myocardial infarction
I24.1	Dressler's syndrome
I24.81	Acute coronary microvascular dysfunction
I24.89	Other forms of acute ischemic heart disease
I24.9	Acute ischemic heart disease, unspecified

DRG Codes

4 rows

DRG Code	Description
311	Angina Pectoris
314	Other Circulatory System Diagnoses with MCC
315	Other Circulatory System Diagnoses with CC
316	Other Circulatory System Diagnoses without CC/MCC

Typical Clinical Scenarios

An older adult presents to the emergency department with sudden-onset chest pain radiating to the left arm, diaphoresis, and shortness of breath; ECG shows ST-segment depressions without persistent ST elevation and cardiac enzymes are elevated, consistent with a non-ST elevation acute myocardial ischemia not attributable to coronary artery spasm. The patient is managed as an acute ischemic coronary event requiring hospital admission and medical therapy, so an other acute ischemic heart disease code is assigned to capture the acute ischemic nature distinct from classic STEMI. Typical codes: I24.2, I24.9
A middle-aged patient develops recurrent episodes of chest pain at rest with transient ST changes and suspected coronary vasospasm after recent use of vasoconstrictive substances; symptoms prompt urgent outpatient cardiology evaluation and short-term admission for monitoring and provocation testing. Because the clinical picture suggests acute ischemia due to coronary artery spasm rather than atherosclerotic plaque rupture, a code for ischemia attributable to coronary artery spasm is selected. Typical codes: I24.0, I24.81
A hospitalized patient with sepsis and hypotension experiences new-onset myocardial ischemia identified by troponin rise and diffuse ST-T changes without focal infarction on imaging; this is documented as an acute ischemic event secondary to systemic hypoperfusion and is coded to reflect an acute ischemic heart disease as a complication of the critical illness. Typical codes: I24.89, I24.9}

Related Codes

I20-ANGINA-PECTORIS

ICD-10-CM Code For Angina Pectoris: Group Overview

I21-ACUTE-MYOCARDIAL-INFARCTION

ICD-10-CM Code For Acute Myocardial Infarction: Group Overview

I22-SUBSEQUENT-MYOCARDIAL-INFARCTION

ICD-10-CM Code For Subsequent ST Elevation (STEMI) And Non-ST Elevation (NSTEMI) Myocardial Infarction: Group Overview

I23-CERTAIN-CURRENT-COMPLICATIONS-FOLLOWING-MYOCARDIAL-INFARCTION

ICD-10-CM Code For Certain Current Complications Following STEMI And NSTEMI: Group Overview

I25-CHRONIC-ISCHEMIC-HEART-DISEASE

ICD-10-CM Code For Chronic Ischemic Heart Disease: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

5 rows

ICD-10-CM Code	Description
I24.0	Acute coronary thrombosis not resulting in myocardial infarction
I24.1	Dressler's syndrome
I24.81	Acute coronary microvascular dysfunction
I24.89	Other forms of acute ischemic heart disease
I24.9	Acute ischemic heart disease, unspecified

DRG Codes

4 rows

DRG Code	Description
311	Angina Pectoris
314	Other Circulatory System Diagnoses with MCC
315	Other Circulatory System Diagnoses with CC
316	Other Circulatory System Diagnoses without CC/MCC

Typical Clinical Scenarios

An older adult presents to the emergency department with sudden-onset chest pain radiating to the left arm, diaphoresis, and shortness of breath; ECG shows ST-segment depressions without persistent ST elevation and cardiac enzymes are elevated, consistent with a non-ST elevation acute myocardial ischemia not attributable to coronary artery spasm. The patient is managed as an acute ischemic coronary event requiring hospital admission and medical therapy, so an other acute ischemic heart disease code is assigned to capture the acute ischemic nature distinct from classic STEMI. Typical codes: I24.2, I24.9
A middle-aged patient develops recurrent episodes of chest pain at rest with transient ST changes and suspected coronary vasospasm after recent use of vasoconstrictive substances; symptoms prompt urgent outpatient cardiology evaluation and short-term admission for monitoring and provocation testing. Because the clinical picture suggests acute ischemia due to coronary artery spasm rather than atherosclerotic plaque rupture, a code for ischemia attributable to coronary artery spasm is selected. Typical codes: I24.0, I24.81
A hospitalized patient with sepsis and hypotension experiences new-onset myocardial ischemia identified by troponin rise and diffuse ST-T changes without focal infarction on imaging; this is documented as an acute ischemic event secondary to systemic hypoperfusion and is coded to reflect an acute ischemic heart disease as a complication of the critical illness. Typical codes: I24.89, I24.9}

Related Codes

I20-ANGINA-PECTORIS

ICD-10-CM Code For Angina Pectoris: Group Overview

I21-ACUTE-MYOCARDIAL-INFARCTION

ICD-10-CM Code For Acute Myocardial Infarction: Group Overview

I22-SUBSEQUENT-MYOCARDIAL-INFARCTION

ICD-10-CM Code For Subsequent ST Elevation (STEMI) And Non-ST Elevation (NSTEMI) Myocardial Infarction: Group Overview

I23-CERTAIN-CURRENT-COMPLICATIONS-FOLLOWING-MYOCARDIAL-INFARCTION

ICD-10-CM Code For Certain Current Complications Following STEMI And NSTEMI: Group Overview

I25-CHRONIC-ISCHEMIC-HEART-DISEASE

ICD-10-CM Code For Chronic Ischemic Heart Disease: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Other Acute Ischemic Heart Diseases: Group Overview

Sign up for ICD-10-CM Code For Other Acute Ischemic Heart Diseases: Group Overview policy alerts

ICD-10-CM I24: Other Acute Ischemic Heart Diseases Overview

ICD-10-CM Code For Other Acute Ischemic Heart Diseases: Group Overview

Sign up for ICD-10-CM Code For Other Acute Ischemic Heart Diseases: Group Overview policy alerts

ICD-10-CM I24: Other Acute Ischemic Heart Diseases Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM group `I24`?

Why is accurate coding within `I24` important for claims?

Which DRGs are related to `I24` diagnoses?

How do the `I24` codes capture clinical severity?

What distinguishes `I24` from acute myocardial infarction coding?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM group `I24`?

Why is accurate coding within `I24` important for claims?

Which DRGs are related to `I24` diagnoses?

How do the `I24` codes capture clinical severity?

What distinguishes `I24` from acute myocardial infarction coding?

References