2026 ICD-10-CM Diagnosis Code A98.4Ebola virus disease

ICD-10-CM Codes›A00–B99›A90-A99›A98

ICD-10-CM A98.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A98.4 is a billable ICD-10-CM diagnosis code for Ebola virus disease. 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
A98.4
Billable Status
Yes — Valid for Submission
Code Describes
Ebola virus disease
Short Description
Ebola virus disease
Same as the full description in the CMS dataset.
Parent Code
A98
Other viral hemorrhagic fevers, not elsewhere classified

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers
CategoryA98Other viral hemorrhagic fevers, not elsewhere classified
This CodeA98.4Ebola virus disease

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Atypical Ebola virus disease
  • Bundibugyo ebolavirus disease
  • Disease caused by Filoviridae
  • Ebola Sudan virus disease
  • Ebola virus disease
  • Filoviral hemorrhagic fever
  • Zaire Ebolavirus disease

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.

    • Disease, diseased
      • Ebola (virus)
    • Ebola virus disease

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

Ebola

Ebola, also known as Ebola virus disease (EVD), is a type of hemorrhagic fever. It is a rare and often deadly disease. It can be caused by several different types of Ebola viruses. There are occasional outbreaks of Ebola, and they mostly occur in Africa.

The full article covers:

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

Read the full article at MedlinePlus

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

Convert A98.4 to ICD-9-CMHistory

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

ICD-9-CM
078.89 Oth spec dis viruses
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 A98.4Overview

Is A98.4 (Other viral hemorrhagic fevers, not elsewhere classified) a billable code?

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

What MS-DRG does A98.4 group to?

When Ebola virus disease 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 A98.4?

Under the General Equivalence Mappings, Ebola virus disease converts to ICD-9-CM 078.89 (oth spec dis viruses). 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.