2027 ICD-10-CM Diagnosis Code A92.30West Nile virus infection, unspecified
ICD-10-CM Codes›A00–B99›A90-A99›A92
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 865 through 866. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 131 closely related codes. 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A92.30: its own notes plus those printed at A92 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- West Nile fever NOS
- West Nile fever without complications
- West Nile virus NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name A92.30, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming A92.30: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
West Nile Fever
a mosquito-borne viral illness caused by the west nile virus, a flavivirus and endemic to regions of africa, asia, and europe. common clinical features include headache; fever; maculopapular rash; gastrointestinal symptoms; and lymphadenopathy. meningitis; encephalitis; and myelitis may also occur. the disease may occasionally be fatal or leave survivors with residual neurologic deficits. (from joynt, clinical neurology, 1996, ch26, p13; lancet 1998 sep 5;352(9130):767-71)
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
What is the ICD-10 code for West Nile virus infection, unspecified?
The ICD-10-CM code for West Nile virus infection, unspecified is A92.30 (sometimes written as A9230). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 866, 865, with relative weights from 0.8691 to 1.3153 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A92.30 a CC or MCC?
CMS lists A92.30 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 131 closely related codes in its exclusion list.
Can A92.30 be reported with B33.1?
Not as a rule. The Excludes1 note at A92, which applies to A92.30, lists "Ross River disease (B33.1)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
