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    v1.0.28
    OpenPayerBilling CodesViral infections characterized by skin and mucous membrane lesionsICD-10-CM b09-unspecified-viral-mucocutaneous-lesions
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    ICD-10-CM Code For Unspecified Viral Infection Characterized By Skin And Mucous Membrane Lesions: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group B09 includes unspecified viral infections characterized by skin and mucous membrane lesions, capturing mucocutaneous eruptions and vesicular or ulcerative lesions when a specific viral agent is not documented. These ICD-10-CM diagnosis codes are used to document clinical encounters where viral mucocutaneous disease is present but not otherwise specified, capturing disease severity, lesion distribution, and associated systemic involvement as documented. Accurate coding within the ICD-10-CM B09 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM B09: Unspecified Viral Infection Characterized By Skin And Mucous Membrane Lesions Overview

    This group captures unspecified viral infections that present primarily with lesions of the skin and mucous membranes, such as mucocutaneous vesicular or ulcerative eruptions when a specific viral etiology is not identified. It targets dermatologic and mucosal surfaces affected by viral processes and includes cases where clinical features suggest a viral cause but laboratory confirmation is lacking. Accurate coding matters because it supports complete clinical documentation and appropriate reimbursement for care related to evaluation and treatment of these presentations.

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    When to Use

    Use a code from this group when a patient presents with viral-appearing skin or mucous membrane lesions and the clinician documents an unspecified viral infection without specifying the causative agent. Do not use this group when a definitive viral diagnosis is confirmed and a more specific ICD-10-CM code is available.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    B09Unspecified viral infection characterized by skin and mucous membrane lesions

    DRG Codes

    2 rows

    DRG CodeDescription
    865Viral Illness with MCC
    866Viral Illness without MCC

    Typical Clinical Scenarios

    • An adult presents to urgent care with a sudden onset of diffuse vesicular and erosive lesions on the oral mucosa and lips, low-grade fever, and malaise for 48 hours; there is no laboratory confirmation and the clinician documents an unspecified viral etiology after ruling out bacterial infection and aphthous stomatitis. The visit is for acute symptomatic management and the provider assigns the unspecified viral infection code because the viral cause is suspected but not confirmed by testing. Typical codes: B09
    • A pediatric patient is seen in primary care with recurrent episodes of clustered vesicles on the perioral skin and intermittent fever over several months; rapid point-of-care testing was not performed and the chart documents an unspecified viral infection affecting skin and mucous membranes as the working diagnosis. The encounter is coded to reflect an ongoing, non-specified viral condition impacting the child’s skin and mucosal surfaces when no specific viral species has been identified. Typical codes: B09
    • An immunocompromised hospitalized adult develops widespread mucocutaneous lesions after a recent chemo infusion; cultures and PCR are inconclusive or pending, and the treating team documents an unspecified viral infection of the skin and mucous membranes as a contributing diagnosis to the patient’s prolonged hospital stay. The code is used to capture an acute, serious mucocutaneous viral process without definitive laboratory identification while management and isolation precautions continue. Typical codes: B09

    Related Codes

    B00-HERPESVIRAL-HERPES-SIMPLEX-INFECTIONS

    ICD-10-CM Code For Herpesviral Herpes Simplex Infections: Group Overview

    B01-VARICELLA-CHICKENPOX

    ICD-10-CM Code For Varicella Chickenpox: Group Overview

    B02-ZOSTER-HERPES-ZOSTER

    ICD-10-CM Code For Zoster Herpes Zoster: Group Overview

    B03-SMALLPOX

    ICD-10-CM Code For Smallpox: Group Overview

    B04-MONKEYPOX

    ICD-10-CM Code For Monkeypox: Group Overview

    B05-MEASLES

    ICD-10-CM Code For Measles: Group Overview

    B06-RUBELLA-GERMAN-MEASLES

    ICD-10-CM Code For Rubella German Measles: Group Overview

    B07-VIRAL-WARTS

    ICD-10-CM Code For Viral Warts: Group Overview

    B08-OTHER-VIRAL-SKIN-AND-MUCOUS-LESIONS

    ICD-10-CM Code For Other Viral Infections Characterized By Skin And Mucous Membrane Lesions: 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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