ICD-10 Code A92.4: Rift Valley fever
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. 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 rift valley fever in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
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.
đź©şClinical context
- 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.
- 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
- 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.
- Rift Valley fever is coded separately from chikungunya, West Nile, Zika, Venezuelan equine fever, and other mosquito-borne viral-fever branches because the documented virus changes final code selection.
- 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.
Code hierarchy
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
Related codes
Sibling codes
Mapped diagnoses and classifications
Coding guidelines
Compatibility
Common synonyms
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.