2026 ICD-10-CM Diagnosis Code A93.1Sandfly fever

ICD-10-CM Codes›A00–B99›A90-A99›A93

ICD-10-CM A93.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A93.1 is a billable ICD-10-CM diagnosis code for sandfly 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. Coders also document this condition as changuinola virus disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

Code Identity

ICD-10-CM Code
A93.1
Billable Status
Yes — Valid for Submission
Code Describes
Sandfly fever
Short Description
Sandfly fever
Same as the full description in the CMS dataset.
Parent Code
A93
Other arthropod-borne viral fevers, not elsewhere classified

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers
CategoryA93Other arthropod-borne viral fevers, not elsewhere classified
This CodeA93.1Sandfly fever

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Changuinola virus disease
  • Disease caused by Orbivirus
  • Neapolitan sandfly fever
  • Sandfly fever caused by Sandfly fever Sicilian virus
  • Sandfly-borne orbivirus fever
  • Sandfly-borne phleboviral disease

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Pappataci fever
  • Phlebotomus fever

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.

    • Changuinola fever
    • Chitral fever
    • Dengue(classical) (fever)
      • sandfly
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • Changuinola
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • Chitral
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • dengue (virus)
        • sandfly
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • Pappataci
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • phlebotomus
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • sandfly
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • three-day
    • Grippe, grippal
      • summer, of Italy
    • Phlebotomus fever
    • Sandfly fever
    • Three-day fever

Clinical ClassificationClinical

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

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

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 A93.1 to ICD-9-CMHistory

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

ICD-9-CM
066.0 Phlebotomus fever
Exact Match The mapping is direct, with no qualifiers.

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 A93.1Overview

Is A93.1 (Other arthropod-borne viral fevers, not elsewhere classified) a billable code?

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

What MS-DRG does A93.1 group to?

When sandfly 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 A93.1?

Under the General Equivalence Mappings, sandfly fever converts to ICD-9-CM 066.0 (phlebotomus fever). The mapping is a direct match.

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.