2027 ICD-10-CM Diagnosis Code A95.9Yellow fever, unspecified

ICD-10-CM Codes›A00–B99›A90-A99›A95

ICD-10-CM A95.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A95.9 is a billable ICD-10-CM diagnosis code for yellow fever, unspecified. 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 3 closely related codes. Coders also document this condition as acute viral hepatitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

Code Identity

ICD-10-CM Code
A95.9
Billable Status
Yes — Valid for Submission
Code Describes
Yellow fever, unspecified
Short Description
Yellow fever, unspecified
Same as the full description in the CMS dataset.
Parent Code
A95
Yellow fever

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers
CategoryA95Yellow fever
This CodeA95.9Yellow fever, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute viral hepatitis
  • Hepatitis in yellow fever
  • Yellow fever

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A95.9: its own notes plus those printed at 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

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

  • Yellow Fever

    an acute infectious disease primarily of the tropics, caused by a virus and transmitted to man by mosquitoes of the genera aedes and haemagogus. the severe form is characterized by fever, hemolytic jaundice, and renal damage.

Patient EducationClinical

Hemorrhagic Fevers

Viral hemorrhagic fevers (VHFs) are a group of illnesses caused by four families of viruses. These include the Ebola and Marburg, Lassa fever, and yellow fever viruses. VHFs have common features: they affect many organs, they damage the blood vessels, and they affect the body's ability to regulate itself.

Read the full article at MedlinePlus

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

Convert A95.9 to ICD-9-CMHistory

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

ICD-9-CM
060.9 Yellow fever NOS
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A95.9Overview

What is the ICD-10 code for yellow fever, unspecified?

The ICD-10-CM code for yellow fever, unspecified is A95.9 (sometimes written as A959). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A95.9 (Yellow fever) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report yellow fever, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does A95.9 group to?

When yellow fever, unspecified 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.

Is A95.9 a CC or MCC?

CMS lists A95.9 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 3 closely related codes in its exclusion list.

What is the ICD-9 equivalent of A95.9?

Under the General Equivalence Mappings, yellow fever, unspecified converts to ICD-9-CM 060.9 (yellow fever NOS). The mapping is a direct match.