2026 ICD-10-CM Diagnosis Code A92.30West Nile virus infection, unspecified
ICD-10-CM Codes›A00–B99›A90-A99›A92
- Billable — Valid for Submission
- Not Chronic
A92.30 is a billable ICD-10-CM diagnosis code for West Nile virus infection, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 865 through 866. Coders also document this condition as asymptomatic West Nile virus infection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Asymptomatic West Nile virus infection
- Disease caused by West Nile virus
- West Nile fever without encephalitis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- West Nile fever NOS
- West Nile fever without complications
- West Nile virus NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- West
- Nile (viral)
- Virus, viral
- West Nile (fever)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
West Nile Virus
West Nile virus (WNV) is an infectious disease. It is most often spread by the bite of an infected mosquito. Most people have no symptoms, while some may develop mild symptoms. But WNV can sometimes cause serious symptoms if the virus enters your brain.
The full article covers:
- What is West Nile Virus?
- How does West Nile Virus spread?
- Who is more likely to develop West Nile Virus?
- What are the symptoms of West Nile Virus?
- How is West Nile Virus diagnosed?
- What are the treatments for West Nile Virus?
- Can West Nile Virus be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A92.30 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A92.30Overview
Is A92.30 (West Nile virus infection) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report West Nile virus infection, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A92.30 group to?
When West Nile virus infection, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 865, 866, with relative weights from 0.8696 to 1.4983 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of A92.30?
Under the General Equivalence Mappings, West Nile virus infection, unspecified converts to ICD-9-CM 066.40 (West Nile Fever NOS). The mapping is a direct match.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
