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 2026, 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.
Chikungunya Fever
An acute infection caused by a mosquito-borne alphavirus CHIKUNGUNYA VIRUS characterized by RASH; FEVER; JOINT PAINS; CONJUNCTIVITIS; MENINGOENCEPHALITIS; LYMPHOPENIA; and THROMBOCYTOPENIA.
Phlebovirus
A genus of the family BUNYAVIRIDAE comprising many viruses, most of which are transmitted by Phlebotomus flies and cause PHLEBOTOMUS FEVER. The type species is RIFT VALLEY FEVER VIRUS.
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.
Rift Valley fever virus
A mosquito-borne species of the PHLEBOVIRUS genus found in eastern, central, and southern Africa, producing massive hepatitis, abortion, and death in sheep, goats, cattle, and other animals. It also has caused disease in humans.
About the A92 Code Range
ICD-10 code A92 covers a group of viral fevers transmitted by mosquitoes, including well-known diseases like chikungunya, West Nile virus infection, and Zika virus disease. These codes help identify specific mosquito-borne viral infections for accurate diagnosis and treatment.
The section includes codes such as A92.0 for Chikungunya virus disease, also called chikungunya fever, and A92.3 for West Nile virus infection, which has further subcodes depending on neurological involvement like encephalitis (A92.31) or meningitis (A92.32). A92.5 identifies Zika virus disease, important for infections occurring during pregnancy. Other codes specify less common mosquito-borne viral fevers, including Venezuelan equine fever (A92.2), Rift Valley fever (A92.4), and a broad category for other specified fevers like Sindbis or Mayaro virus (A92.8). The A92.9 code is reserved for unspecified mosquito-borne viral fevers. Incorporating these terms and codes facilitates precise classification of mosquito-transmitted viral diseases in clinical documentation and medical coding workflows, ensuring appropriate patient care and reporting.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
