2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A98.4 is a billable ICD-10-CM diagnosis code for Ebola virus disease. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 865 through 866. Coders also document this condition as atypical Ebola virus disease. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A98.4: its own notes plus those printed at A98 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From A98 Other viral hemorrhagic fevers, not elsewhere classified applies to 7 codes
  • chikungunya hemorrhagic fever (A92.0)
  • dengue hemorrhagic fever (A91)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

  • Hemorrhagic Fever, Ebola

    a highly fatal, acute hemorrhagic fever caused by ebolavirus.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A98.4Overview

What is the ICD-10 code for Ebola virus disease?

The ICD-10-CM code for Ebola virus disease is A98.4 (sometimes written as A984). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 866, 865, with relative weights from 0.8691 to 1.3153 depending on complications. Higher weights mean higher Medicare reimbursement.

Can A98.4 be reported with A92.0?

Not as a rule. The Excludes1 note at A98, which applies to A98.4, lists "chikungunya hemorrhagic fever (A92.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

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.