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    OpenPayerBilling CodesArthropod-borne viral fevers and viral hemorrhagic feversICD-10-CM a99-unspecified-viral-hemorrhagic-fever
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    ICD-10-CM Code For Unspecified Viral Hemorrhagic Fever: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A99 includes unspecified viral hemorrhagic fevers, encompassing acute systemic viral infections characterized by fever and hemorrhagic manifestations when a specific etiologic agent is not identified. These ICD-10-CM diagnosis codes are used to document severe systemic viral infections that may involve bleeding, vascular leak, shock, or multi-organ involvement, capturing disease severity and clinical complexity. Accurate coding within the ICD-10-CM A99 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM A99: Unspecified Viral Hemorrhagic Fever Overview

    The ICD-10-CM A99 group represents unspecified viral hemorrhagic fevers, severe systemic infections that can cause bleeding, shock, and multi-organ dysfunction. These conditions affect the hematologic and vascular systems and are often associated with high clinical acuity. Accurate coding is important for complete clinical documentation and for appropriate reimbursement when claims reflect the true severity and resource use.

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    When to Use

    Use a code from this group when a clinician documents a viral hemorrhagic fever without specification of the causative virus or when testing does not identify a specific agent. These codes apply in clinical scenarios with documented bleeding, vascular instability, or multi-organ involvement attributed to a viral hemorrhagic process.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    A99Unspecified viral hemorrhagic fever

    DRG Codes

    2 rows

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

    Typical Clinical Scenarios

    • An adult presents to the emergency department with acute high fever, severe myalgias, hypotension, mucosal bleeding (epistaxis and gum bleeding), and thrombocytopenia after recent travel to a region with known viral hemorrhagic fever activity. Rapid supportive care and isolation are initiated while specific pathogen testing is pending; because the presentation is a viral hemorrhagic syndrome without a confirmed etiologic agent at the time of coding, a code from this group is assigned. Typical codes: A99
    • An elderly nursing home resident develops sudden-onset fever, petechial rash, and progressive multi-organ dysfunction (renal impairment and altered mental status) after being bitten by an unknown arthropod; laboratory evaluation is inconclusive for a specific viral etiology. The clinician documents a nonspecific viral hemorrhagic fever as the working diagnosis for inpatient management and surveillance reporting, so a code from this group is used on the hospital record. Typical codes: A99
    • A patient is admitted for management of septic-appearing shock with diffuse bleeding and coagulopathy after exposure in an endemic area; extensive testing fails to identify a specific hemorrhagic virus but clinical course and public health concern prompt coding for an unspecified viral hemorrhagic fever as the principal diagnosis for acute care and public health notification. Typical codes: A99

    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

    A94-UNSPECIFIED-ARTHROPOD-BORNE-VIRAL-FEVER

    ICD-10-CM Code For Unspecified Arthropod-Borne Viral Fever: 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

    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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