2026 ICD-10-CM Diagnosis Code A92.4Rift Valley fever

ICD-10-CM Codes›A00–B99›A90-A99›A92

ICD-10-CM A92.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A92.4 is a billable ICD-10-CM diagnosis code for rift Valley fever. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

Code Identity

ICD-10-CM Code
A92.4
Billable Status
Yes — Valid for Submission
Code Describes
Rift Valley fever
Short Description
Rift Valley fever
Same as the full description in the CMS dataset.
Parent Code
A92
Other mosquito-borne viral fevers

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers
CategoryA92Other mosquito-borne viral fevers
This CodeA92.4Rift Valley fever

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Rift valley fever
  • Rift Valley virus encephalitis

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)
      • Rift Valley (viral)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF008
Viral infection
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • 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.

  • 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.

Patient EducationClinical

Viral Infections

Viruses are very tiny germs. They are made of genetic material (either DNA or RNA) inside of a protein coating. There are a huge number of viruses on earth. Only a small number of them can infect humans. Those viruses can infect our cells, which may cause disease.

The full article covers:

  • What are viruses?
  • How are viruses spread?
  • How do viruses cause disease?
  • What are the treatments for viral infections?
  • Can viral infections be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A92.4 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
066.3 Mosquito-borne fever NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A92.4Overview

Is A92.4 (Other mosquito-borne viral fevers) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report rift Valley fever on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A92.4 group to?

When rift Valley fever 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 A92.4?

Under the General Equivalence Mappings, rift Valley fever converts to ICD-9-CM 066.3 (mosquito-borne fever NEC). The mapping is approximate, so confirm the match fits the documentation.

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.