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    OpenPayerBilling CodesIschemic heart diseasesICD-10-CM i23-certain-current-complications-following-myocardial-infarction
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    ICD-10-CM Code For Certain Current Complications Following STEMI And NSTEMI: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group I23 includes acute complications occurring within 28 days after ST elevation myocardial infarction and non-ST elevation myocardial infarction, such as cardiac rupture, aneurysm, conduction abnormalities, and papillary muscle dysfunction. These ICD-10-CM diagnosis codes are used to document acute post-infarction clinical scenarios, capturing disease severity, organ involvement, or clinical complexity relevant to this group. Accurate coding within the ICD-10-CM I23 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM I23: Certain Current Complications Following ST Elevation (STEMI) And Non-ST Elevation (NSTEMI) Myocardial Infarction (Within The 28 Day Period) Overview

    This group represents complications that arise within the first 28 days after a ST elevation myocardial infarction or non-ST elevation myocardial infarction, affecting the heart and related structures. It targets acute post-infarction cardiac sequelae such as rupture, aneurysm, conduction disorders, and papillary muscle dysfunction. Accurate coding of these conditions matters for clinical completeness and appropriate reimbursement because it documents the acute severity and resource use associated with early post-infarction care.

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    When to Use

    Use a code from this group when documenting a complication that is temporally related to a recent myocardial infarction and occurs within the first 28 days after the index event. Codes in this group should be assigned in addition to the code for the myocardial infarction when both the infarction and its acute complication are present.

    ICD-10-CM Codes

    9 rows

    ICD-10-CM CodeDescription
    I23.0Hemopericardium as current complication following acute myocardial infarction
    I23.1Atrial septal defect as current complication following acute myocardial infarction
    I23.2Ventricular septal defect as current complication following acute myocardial infarction
    I23.3Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarction
    I23.4Rupture of chordae tendineae as current complication following acute myocardial infarction
    I23.5Rupture of papillary muscle as current complication following acute myocardial infarction
    I23.6Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
    I23.7Postinfarction angina
    I23.8Other current complications following acute myocardial infarction

    DRG Codes

    5 rows

    DRG CodeDescription
    306Cardiac Congenital and Valvular Disorders with MCC
    307Cardiac Congenital and Valvular Disorders without MCC
    314Other Circulatory System Diagnoses with MCC
    315Other Circulatory System Diagnoses with CC
    316Other Circulatory System Diagnoses without CC/MCC

    Typical Clinical Scenarios

    • An elderly patient presents to the emergency department within two days of a documented ST-elevation myocardial infarction who develops new-onset papillary muscle dysfunction with acute severe mitral regurgitation causing pulmonary edema and hypotension; urgent evaluation confirms mechanical complication related to recent infarct, so a code from this group is assigned to capture papillary muscle rupture/acute dysfunction as a current complication. Typical codes: I23.3.
    • A middle-aged patient is admitted to the coronary care unit 10 days after an NSTEMI with progressive heart failure and reports pleuritic chest pain; imaging reveals a small ventricular septal defect and persistent mural thrombus at the infarct site — these postinfarction mechanical and thrombotic sequelae occurring within the 28-day period are coded from this group to document complications of the recent MI. Typical codes: I23.2, I23.4.
    • A younger patient presents to outpatient cardiology two weeks after successful reperfusion for STEMI with recurrent ventricular arrhythmias requiring monitoring and antiarrhythmic therapy; because the malignant arrhythmia is a direct complication of the recent infarction within the 28-day window, a code from this group is used to indicate postinfarction cardiac dysrhythmia. Typical codes: I23.6.

    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

    I24-OTHER-ACUTE-ISCHEMIC-HEART-DISEASES

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