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    v1.0.28
    OpenPayerBilling CodesIschemic heart diseasesICD-10-CM i24-other-acute-ischemic-heart-diseases
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    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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    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 CodeDescription
    I24.0Acute coronary thrombosis not resulting in myocardial infarction
    I24.1Dressler's syndrome
    I24.81Acute coronary microvascular dysfunction
    I24.89Other forms of acute ischemic heart disease
    I24.9Acute ischemic heart disease, unspecified

    DRG Codes

    4 rows

    DRG CodeDescription
    311Angina Pectoris
    314Other Circulatory System Diagnoses with MCC
    315Other Circulatory System Diagnoses with CC
    316Other 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. 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. 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. 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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