ICD-10 Code A99 – Unspecified Viral Hemorrhagic Fever (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A99 – Unspecified viral hemorrhagic fever
What it is
A99 identifies a viral hemorrhagic fever when the specific virus is not documented. Use it for a serious viral illness associated with bleeding, but without a named hemorrhagic fever diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Typical descriptions may include fever with hemorrhagic manifestations, such as bleeding or bruising, but the record should support a viral hemorrhagic fever diagnosis.
When to use this code
Use A99 when the provider documents viral hemorrhagic fever and does not name the causative virus. It also fits cases where the chart says “unspecified viral hemorrhagic fever” or equivalent wording. If the organism is identified, code the specific condition instead.
Do not use for
Do not use this code for nonviral bleeding disorders or hemorrhage without a documented viral cause. Check documentation if the note names a specific hemorrhagic fever or another infection.
Coding tip
Code the most specific viral hemorrhagic fever documented; use A99 only when the provider leaves the virus unspecified.