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    v1.0.28
    OpenPayerBilling CodesIschemic heart diseasesICD-10-CM i20-angina-pectoris
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    ICD-10-CM Code For Angina Pectoris: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group I20 includes diagnoses for angina pectoris such as stable angina, unstable angina, and other forms of chest pain attributable to myocardial ischemia. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving symptomatic myocardial ischemia, capturing acuity, severity, and clinical complexity relevant to coronary ischemic conditions. Accurate coding within the ICD-10-CM I20 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM I20: Angina Pectoris Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) I20 group represents angina pectoris diagnoses, a spectrum of ischemic chest pain due to myocardial oxygen supply-demand imbalance. These codes target the coronary circulation and acute or chronic manifestations of myocardial ischemia. Accurate coding matters for reimbursement because it links clinical documentation to the severity and acuity of ischemic heart disease and supports appropriate claim adjudication.

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    When to Use

    Use a code from this group when a clinician documents angina pectoris as the diagnosis, specifying type or acuity such as unstable or stable angina. Select the most specific code that reflects the clinical presentation and documented severity to support coding accuracy.

    ICD-10-CM Codes

    6 rows

    ICD-10-CM CodeDescription
    I20.0Unstable angina
    I20.1Angina pectoris with documented spasm
    I20.2Refractory angina pectoris
    I20.81Angina pectoris with coronary microvascular dysfunction
    I20.89Other forms of angina pectoris
    I20.9Angina pectoris, unspecified

    DRG Codes

    1 rows

    DRG CodeDescription
    311Angina Pectoris

    Typical Clinical Scenarios

    • An older adult presents to the emergency department with sudden-onset substernal chest pressure radiating to the left arm, diaphoresis, nausea, and shortness of breath that began at rest. Initial ECG shows transient ST-segment depressions and troponin is negative; symptoms resolve with sublingual nitroglycerin in the ED. A diagnosis from this group is assigned for an unstable presentation of chest pain due to myocardial ischemia without infarction. Typical codes: I20.0, I20.1
    • A middle-aged patient with known atherosclerotic coronary disease reports predictable exertional chest tightness that occurs when climbing stairs and reliably improves with rest or nitroglycerin; symptoms have been stable and occur with the same level of activity for months. This chronic, reproducible pattern represents stable ischemic heart pain managed in outpatient follow-up, so a diagnosis from this group describing chronic effort-related angina is assigned. Typical codes: I20.8, I20.9
    • A hospitalized patient on the medical ward develops recurrent chest pain episodes after recent percutaneous coronary intervention; the pain is new, occurs at rest, and is associated with transient ischemic ECG changes but no biomarker elevation. In-hospital evaluation attributes the episodes to vasospasm or restenosis as a complication of coronary disease, prompting assignment of an angina diagnosis from this group to capture the acute ischemic complication. Typical codes: I20.2, I20.81

    Related Codes

    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

    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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