2025 ICD-10-CM code A92.3
West Nile virus infection.
Medical necessity depends on the severity of the infection. For uncomplicated West Nile fever, medical necessity typically covers diagnostic testing and symptomatic treatment.Hospitalization and intensive care are medically necessary for severe neuroinvasive disease.
Diagnosis is based on symptoms, exposure history, and lab tests (serum/CSF IgM antibody, RT-PCR, ELISA). Treatment is mainly supportive (rest, fluids, pain relievers) with hospitalization and respiratory support for severe cases. Prevention focuses on avoiding mosquito bites.
In simple words: West Nile virus is a disease spread by infected mosquitoes. Most people don't have symptoms. Some get flu-like symptoms (West Nile fever). Rarely, it causes serious brain problems.
West Nile virus (WNV) infection is a mosquito-borne illness. Most infected individuals are asymptomatic. About 20% develop West Nile fever with symptoms like fever, headache, body aches, and sometimes rash.Less than 1% develop severe neurological symptoms (West Nile neuroinvasive disease), including meningitis, encephalitis, and acute flaccid paralysis.
Example 1: A 45-year-old patient presents with fever, headache, body aches, and fatigue after recent outdoor activities.Blood tests confirm West Nile virus infection (A92.3)., A 65-year-old individual develops high fever, neck stiffness, confusion, and tremors.Following hospitalization and lumbar puncture, West Nile encephalitis is diagnosed (A92.3)., A child experiences mild fever and rash after playing outside. The pediatrician suspects West Nile virus and orders appropriate blood tests for confirmation (A92.3 if positive).
Symptoms (fever, headache, fatigue, rash, neurological signs), history of mosquito exposure, laboratory results (IgM antibody, RT-PCR, ELISA), cerebrospinal fluid analysis (if neuroinvasive disease is suspected), and details of supportive care or hospital admission.
- Specialties:Infectious Disease, Internal Medicine, Family Medicine, Pediatrics, Neurology (for neuroinvasive disease)
- Place of Service:Office, Home, Hospital (Inpatient and Outpatient),Public Health Clinic, Urgent Care Facility,Telehealth Provided in Patient’s Home,Telehealth Provided Other than in Patient’s Home.