2026 ICD-10-CM Diagnosis Code A90Dengue fever [classical dengue]

ICD-10-CM Codes›A00–B99›A90-A99›A90

ICD-10-CM A90
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A90 is a billable ICD-10-CM diagnosis code for dengue fever [classical dengue]. 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 dengue. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

Code Identity

ICD-10-CM Code
A90
Billable Status
Yes — Valid for Submission
Code Describes
Dengue fever [classical dengue]
Chapter
A90-A99
Arthropod-borne viral fevers and viral hemorrhagic fevers

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers
CategoryA90Dengue fever [classical dengue]
This CodeA90Dengue fever [classical dengue]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Dengue
  • Dengue virus encephalitis
  • Dengue with warning signs
  • Dengue without warning signs
  • Myelitis caused by Dengue virus

Tabular List NotesGuidance

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

Type 1 Excludes

  • dengue hemorrhagic fever A91

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.

    • Dengue(classical) (fever)
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • Aden (dengue)
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • breakbone
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • dandy
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • dengue (virus)
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • seven day (leptospirosis) (autumnal) (Japanese)
        • dengue
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • solar
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • sun

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

  • Dengue

    an acute febrile disease transmitted by the bite of aedes mosquitoes infected with dengue virus. it is self-limiting and characterized by fever, myalgia, headache, and rash. severe dengue is a more virulent form of dengue.

  • Dengue Vaccines

    vaccines or candidate vaccines used to prevent infection with dengue virus. these include live-attenuated, subunit, dna, and inactivated vaccines.

  • Dengue Virus

    a species of the genus flavivirus which causes an acute febrile and sometimes hemorrhagic disease in man. dengue is mosquito-borne and four serotypes are known.

  • Severe Dengue

    a virulent form of dengue characterized by thrombocytopenia and an increase in vascular permeability (grades i and ii) and distinguished by a positive pain test (e.g., tourniquet pain test). when accompanied by shock (grades iii and iv), it is called dengue shock syndrome.

  • Flavivirus

    a genus of flaviviridae containing several subgroups and many species. most are arboviruses transmitted by mosquitoes or ticks. the type species is yellow fever virus.

Patient EducationClinical

Dengue

Dengue is a viral infection. It can be caused by four related viruses. You can get it if an infected mosquito bites you. It is common in warm, wet areas of the world. Although rare, it can be found in some parts of the United States. Outbreaks are more common during rainy seasons.

The full article covers:

  • What is dengue?
  • How does dengue spread?
  • What are the symptoms of dengue and severe dengue?
  • How is dengue diagnosed?
  • What are the treatments for dengue?
  • Can dengue be prevented?

Read the full article at MedlinePlus

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

Convert A90 to ICD-9-CMHistory

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

ICD-9-CM
061 Dengue
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 A90Overview

Is A90 (Dengue fever [classical dengue]) a billable code?

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

What MS-DRG does A90 group to?

When dengue fever [classical dengue] 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 A90?

Under the General Equivalence Mappings, dengue fever [classical dengue] converts to ICD-9-CM 061 (dengue). 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.