Skip to content
Dx

ICD-10-CM 2027 diagnosis code

A92.3West Nile virus infection

Not billable — use a more specific code

A92.3 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A92.3

A92.3 is the ICD-10-CM diagnosis code for West Nile virus infection. It belongs to category A92 (other mosquito-borne viral fevers), block A90-A99 (arthropod-borne viral fevers and viral hemorrhagic fevers) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within A92 (other mosquito-borne viral fevers), A92.3 is specifically for West Nile virus infection. Related codes cover Chikungunya virus disease (A92.0), O'nyong-nyong fever (A92.1), Venezuelan equine fever (A92.2), Rift Valley fever (A92.4), Zika virus disease (A92.5), other specified mosquito-borne viral fevers (A92.8) and mosquito-borne viral fever, unspecified (A92.9).

To report this condition, pick the subcode that matches the documentation: A92.30 (unspecified), A92.31 (with encephalitis), A92.32 (with other neurologic manifestation) and A92.39 (with other complications).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under A92.3

Coding notes

Applicable toConditions and synonyms classified to this code
  • West Nile fever

Notes that apply from higher levels

Instructions written at a parent level also apply to A92.3.

› From A92 Other mosquito-borne viral fevers
Excludes1
  • Ross River disease (B33.1)

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Codes whose notes reference A92.3

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about A92.3

Is A92.3 billable?

No. A92.3 is a header code. Report one of its more specific subcodes instead.