ICD10
ICD-10 Code A92: Other mosquito-borne viral fevers
Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).
đź“‹Clinical overview
This ICD-10 code is commonly used when documentation describes a mosquito-borne viral fever. The most accurate code depends on whether the chart identifies chikungunya, O'nyong-nyong fever, Venezuelan equine fever, West Nile virus, Rift Valley fever, Zika virus disease, another specified mosquito-borne viral fever, or an unspecified presentation, and for West Nile whether neurologic involvement is documented.
When is it used?
- May be used when a clinician documents other mosquito-borne viral fevers in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
đź©şClinical context
When commonly used
- Primary-care, urgent-care, emergency, infectious-disease, travel-medicine, neurology, inpatient, and follow-up documentation where mosquito-borne viral illness is part of the active assessment.
- Coding and utilization-review workflows where the chart identifies the specific virus or documents West Nile neurologic involvement and that detail changes final code specificity.
Common management context
- Evaluation often includes travel or exposure history, symptom review for fever, rash, arthralgia, headache, and neurologic findings, viral testing review, supportive-care planning, and public-health or infectious-disease follow-up when indicated.
- Documentation usually becomes more specific when the chart identifies the virus directly, or in West Nile cases clarifies encephalitis versus another neurologic manifestation versus other complications.
- Specialist context already linked on this page includes Infectious Disease Specialist, General Physician.
🔍Key distinctions
Important notes
- This ICD-10 family captures several distinct mosquito-borne viral infections rather than a single virus alone.
- Virus identity matters strongly here, and within West Nile infection the presence and type of neurologic involvement are additional specificity drivers.
- This parent page groups mosquito-borne viral fevers, so the final billable code usually depends on whether the chart identifies chikungunya, O'nyong-nyong fever, Venezuelan equine fever, West Nile virus, Rift Valley fever, Zika virus disease, another specified mosquito-borne viral fever, or an unspecified presentation.
- Documentation that describes mosquito-borne viral fever is coded differently from non-mosquito-borne viral infections, bacterial meningitis, or nonspecific febrile illness because the vector-borne virus and any documented neurologic or other complication pattern drive final code selection.
Important exclusions
- Ross River disease (B33.1)
Related codes to consider
A92.0Chikungunya virus disease
Related mosquito-borne-viral-fever ICD-10 code; documentation often becomes more specific when the chart identifies the virus directly or clarifies West Nile neurologic involvement.
A92.1O'nyong-nyong fever
Related mosquito-borne-viral-fever ICD-10 code; documentation often becomes more specific when the chart identifies the virus directly or clarifies West Nile neurologic involvement.
A92.2Venezuelan equine fever
Related mosquito-borne-viral-fever ICD-10 code; documentation often becomes more specific when the chart identifies the virus directly or clarifies West Nile neurologic involvement.
A92.4Rift Valley fever
Related mosquito-borne-viral-fever ICD-10 code; documentation often becomes more specific when the chart identifies the virus directly or clarifies West Nile neurologic involvement.
Code hierarchy
chapter
1Certain infectious and parasitic diseases (A00-B99)
block
A90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers
currentA90-A99
Official coding notes
Excludes1 (do not code together)
- Ross River disease (B33.1)
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
Infectious Disease SpecialistGeneral Physician
Related codes
Sibling codes
A90Dengue fever [classical dengue]billableA91Dengue hemorrhagic feverbillableA93Other arthropod-borne viral fevers, not elsewhere classifiedA94Unspecified arthropod-borne viral feverbillableA95Yellow feverA96Arenaviral hemorrhagic feverA98Other viral hemorrhagic fevers, not elsewhere classifiedA99Unspecified viral hemorrhagic feverbillable
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
A92
Replacement codes
A92.0 — Chikungunya virus diseaseA92.1 — O'nyong-nyong feverA92.2 — Venezuelan equine feverA92.4 — Rift Valley feverA92.5 — Zika virus diseaseA92.8 — Other specified mosquito-borne viral feversA92.9 — Mosquito-borne viral fever, unspecified
Common synonyms
Other mosquito-borne viral fevers
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.