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    v1.0.28
    OpenPayerBilling CodesCongenital malformations of the circulatory systemICD-10-CM q23-congenital-aortic-and-mitral-valve-malformations
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    ICD-10-CM Code For Congenital Malformations Of Aortic And Mitral Valves: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group Q23 includes congenital malformations of the aortic and mitral valves such as valve stenosis, valve atresia, clefts, and other structural anomalies present at birth that impair valve function. These ICD-10-CM diagnosis codes are used to document congenital valvular defects that affect cardiac hemodynamics, surgical planning, and long-term management, capturing disease severity and organ involvement. Accurate coding within the ICD-10-CM Q23 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM Q23: Congenital Malformations Of Aortic And Mitral Valves Overview

    This group represents congenital structural abnormalities of the aortic and mitral heart valves that affect cardiac function and hemodynamics. It targets malformations present at birth involving valve leaflets, commissures, or supporting structures within the circulatory system. Accurate coding is important for reflecting clinical complexity and supports correct claim processing and reimbursement.

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    When to Use

    Use codes from this group when documenting a congenital malformation of the aortic or mitral valve identified by physical examination, imaging, or surgical findings. Select the code that best reflects the documented valve abnormality, its severity, and any specified laterality or associated cardiac conditions.

    ICD-10-CM Codes

    9 rows

    ICD-10-CM CodeDescription
    Q23.0Congenital stenosis of aortic valve
    Q23.1Congenital insufficiency of aortic valve
    Q23.2Congenital mitral stenosis
    Q23.3Congenital mitral insufficiency
    Q23.4Hypoplastic left heart syndrome
    Q23.81Bicuspid aortic valve
    Q23.82Congenital mitral valve cleft leaflet
    Q23.88Other congenital malformations of aortic and mitral valves
    Q23.9Congenital malformation of aortic and mitral valves, unspecified

    DRG Codes

    2 rows

    DRG CodeDescription
    306Cardiac Congenital and Valvular Disorders with MCC
    307Cardiac Congenital and Valvular Disorders without MCC

    Typical Clinical Scenarios

    • An infant is evaluated in the newborn nursery after a heart murmur is noted on routine exam; echocardiography reveals malformation of the aortic valve with a unicuspid or bicuspid morphology causing aortic stenosis and/or regurgitation. The diagnosis is assigned to document a congenital structural abnormality of the aortic valve identified shortly after birth and to guide cardiology follow-up and potential surgical planning. Typical codes: Q23.0, Q23.1
    • An adolescent with a history of congenital mitral valve abnormality presents for outpatient cardiology follow-up for chronic mitral regurgitation and progressive left atrial enlargement; management includes serial imaging and medical therapy for heart failure symptoms. A congenital malformation of the mitral valve code is used to capture the ongoing, chronic structural valve lesion as the underlying cause of the patient’s valvular dysfunction and need for surveillance. Typical codes: Q23.2, Q23.81
    • An adult presents to the emergency department with acute decompensated heart failure and is found on imaging to have a congenital malformation of both aortic and mitral valves that has resulted in severe valvular dysfunction and precipitated hospitalization; the congenital lesion is recorded as a comorbidity affecting acute management and surgical risk. Typical codes: Q23.4, Q23.88

    Related Codes

    Q20-CONGENITAL-CARDIAC-CHAMBERS-AND-CONNECTIONS

    ICD-10-CM Code For Congenital Malformations Of Cardiac Chambers And Connections: Group Overview

    Q21-CONGENITAL-CARDIAC-SEPTAL-DEFECTS

    ICD-10-CM Code For Congenital Malformations Of Cardiac Septa: Group Overview

    Q22-CONGENITAL-PULMONARY-TRICUSPID-VALVE

    ICD-10-CM Code For Congenital Malformations Of Pulmonary And Tricuspid Valves: Group Overview

    Q24-OTHER-CONGENITAL-MALFORMATIONS-OF-HEART

    ICD-10-CM Code For Other Congenital Malformations Of Heart: Group Overview

    Q25-CONGENITAL-MALFORMATIONS-OF-GREAT-ARTERIES

    ICD-10-CM Code For Congenital Malformations Of Great Arteries: Group Overview

    Q26-CONGENITAL-MALFORMATIONS-GREAT-VEINS

    ICD-10-CM Code For Congenital Malformations Of Great Veins: Group Overview

    Q27-OTHER-CONGENITAL-PERIPHERAL-VASCULAR-MALFORMATIONS

    ICD-10-CM Code For Other Congenital Malformations Of Peripheral Vascular System: Group Overview

    Q28-OTHER-CONGENITAL-CIRCULATORY-MALFORMATIONS

    ICD-10-CM Code For Other Congenital Malformations Of Circulatory System: 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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