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ICD-10 Code A92.3: West Nile virus infection

A92.3 is an ICD-10 diagnosis entry used to group records related to West Nile virus infection. 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. 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).

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 west nile virus infection 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 West Nile virus infection patterns, so the final billable code usually depends on whether the chart documents unspecified disease, encephalitis, another neurologic manifestation, or other complications.
  • 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.
Related codes to consider
A92.30West Nile virus infection, unspecified
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.
A92.31West Nile virus infection with encephalitis
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.
A92.32West Nile virus infection with other neurologic manifestation
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.
A92.39West Nile virus infection with other complications
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
category
A92Other mosquito-borne viral fevers
currentA92

Official coding notes

Inclusion terms
  • West Nile fever

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

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
A92.3
Replacement codes
A92.30 — West Nile virus infection, unspecifiedA92.31 — West Nile virus infection with encephalitisA92.32 — West Nile virus infection with other neurologic manifestationA92.39 — West Nile virus infection with other complications

Common synonyms

West Nile virus infection

Frequently asked questions

Code details

CodeA92.3
SystemICD10
Display nameWest Nile virus infection
ChapterCertain infectious and parasitic diseases (A00-B99)
BlockArthropod-borne viral fevers and viral hemorrhagic fevers

Flags

BillableNo
Valid clinical useNo

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

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.