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    OpenPayerBilling CodesArthropod-borne viral fevers and viral hemorrhagic feversICD-10-CM a94-unspecified-arthropod-borne-viral-fever
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    ICD-10-CM Code For Unspecified Arthropod-Borne Viral Fever: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A94 includes unspecified arthropod-borne viral fevers such as febrile viral illnesses transmitted by mosquitoes, ticks, or other arthropods when a specific virus is not identified. These ICD-10-CM diagnosis codes are used to document clinical encounters for patients with arthropod-transmitted viral infections, capturing disease presentation, organ system involvement, and clinical complexity relevant to this group. Accurate coding within the ICD-10-CM A94 group supports proper claim adjudication and complete clinical documentation and appropriate reimbursement.

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    ICD-10-CM A94: Unspecified Arthropod-Borne Viral Fever Overview

    The ICD-10-CM A94 group represents unspecified arthropod-borne viral fevers, illnesses caused by viruses transmitted by arthropods such as mosquitoes and ticks. These conditions primarily affect systemic viral infection processes and can involve febrile illness with variable organ involvement. Accurate coding is important for complete clinical documentation and supports appropriate reimbursement.

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    When to Use

    Use a code from this group when a patient presents with a clinically diagnosed arthropod-borne viral fever and laboratory testing does not identify a specific virus. These codes are appropriate for encounters documenting the febrile illness attributed to arthropod transmission without further specification of etiology.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    A94Unspecified arthropod-borne viral fever

    DRG Codes

    2 rows

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

    Typical Clinical Scenarios

    • An adult patient presents to the emergency department with acute onset of high fever, severe headache, myalgia, and diffuse maculopapular rash after recent travel to an area with active mosquito-borne viral outbreaks; laboratory testing is pending but initial presentation is consistent with a non-specific arboviral infection, so an unspecified arthropod-borne viral fever diagnosis is assigned while awaiting confirmatory results. Typical codes: A94
    • An elderly nursing home resident develops new fever, malaise, and altered mental status with no clear bacterial source; exposure history reveals recent mosquito bites and no definitive lab identification is available, so clinicians document an unspecified arthropod-borne viral fever as the working diagnosis to capture the likely viral etiology affecting management and surveillance. Typical codes: A94
    • A patient admitted for management of a chronic comorbidity (e.g., diabetes) experiences acute deterioration with fever and widespread rash following outdoor activities; initial infectious workup is inconclusive for specific arboviruses, and the team records an unspecified arthropod-borne viral fever as a comorbid acute diagnosis contributing to the current hospitalization. Typical codes: A94

    Related Codes

    A90-DENGUE-FEVER-CLASSICAL-DENGUE

    ICD-10-CM Code For Dengue Fever Classical Dengue: Group Overview

    A91-DENGUE-HEMORRHAGIC-FEVER

    ICD-10-CM Code For Dengue Hemorrhagic Fever: Group Overview

    A92-OTHER-MOSQUITO-BORNE-VIRAL-FEVERS

    ICD-10-CM Code For Other Mosquito Borne Viral Fevers: Group Overview

    A93-OTHER-ARTHROPOD-BORNE-VIRAL-FEVERS

    ICD-10-CM Code For Other Arthropod Borne Viral Fevers Not Elsewhere Classified: Group Overview

    A95-YELLOW-FEVER

    ICD-10-CM Code For Yellow Fever: Group Overview

    A96-ARENAVIRAL-HEMORRHAGIC-FEVER

    ICD-10-CM Code for Arenaviral Hemorrhagic Fever: Group Overview

    A98-OTHER-VIRAL-HEMORRHAGIC-FEVERS

    ICD-10-CM Code For Other Viral Hemorrhagic Fevers Not Elsewhere Classified: Group Overview

    A99-UNSPECIFIED-VIRAL-HEMORRHAGIC-FEVER

    ICD-10-CM Code For Unspecified Viral Hemorrhagic Fever: 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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