Other mosquito-borne viral fevers (A92) ICD-10-CM
The A92 code range covers other mosquito-borne viral fevers with 13 ICD-10-CM diagnosis codes. 11 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- Ross River disease B33.1
Codes in the A92 Range 13 codes · 11 billable
- A92 Other mosquito-borne viral feversNon-billable
- A92.0 Chikungunya virus disease
- A92.1 O'nyong-nyong fever
- A92.2 Venezuelan equine fever
- A92.3 West Nile virus infectionNon-billable
- A92.30 West Nile virus infection, unspecified
- A92.31 West Nile virus infection with encephalitis
- A92.32 West Nile virus infection with other neurologic manifestation
- A92.39 West Nile virus infection with other complications
- A92.4 Rift Valley fever
- A92.5 Zika virus disease
- A92.8 Other specified mosquito-borne viral fevers
- A92.9 Mosquito-borne viral fever, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A92 range.
Rift Valley Fever
An acute infection caused by the RIFT VALLEY FEVER VIRUS, an RNA arthropod-borne virus, affecting domestic animals and humans. In animals, symptoms include HEPATITIS; abortion (ABORTION, VETERINARY); and DEATH. In humans, symptoms range from those of a flu-like disease to hemorrhagic fever, ENCEPHALITIS, or BLINDNESS.
Venezuelan Equine Fever
A condition caused by infection by the Venezuelan equine encephalitis virus, which is characterized by headache, fever, myalgia, nausea, and vomiting.
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)
Zika Virus Infection
A viral disease transmitted by the bite of AEDES mosquitoes infected with ZIKA VIRUS. Its mild DENGUE-like symptoms include fever, rash, headaches and ARTHRALGIA. The viral infection during pregnancy, in rare cases, is associated with congenital brain and ocular abnormalities, called Congenital Zika Syndrome, including MICROCEPHALY and may also lead to GUILLAIN-BARRE SYNDROME.
About the A92 Code Range
These mosquito-borne viral illnesses include chikungunya, O'nyong-nyong fever, Venezuelan equine fever, West Nile virus infection, Rift Valley fever, and Zika virus disease.
Most subdivisions identify a named illness. A92.3 divides West Nile virus infection into unspecified infection, brain inflammation, other nervous system effects, and other complications. The remaining subdivisions distinguish another specified mosquito-borne viral fever from one left unspecified.
Questions About This Page
How many billable codes are in the A92 range?
Of the 13 codes in this range, 11 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the A92 range classify?
The range classifies other mosquito-borne viral fevers. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
