2027 ICD-10-CM Diagnosis Code A98.5Hemorrhagic fever with renal syndrome

ICD-10-CM Codes›A00–B99›A90-A99›A98

ICD-10-CM A98.5
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A98.5 is a billable ICD-10-CM diagnosis code for hemorrhagic fever with renal syndrome. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 689 through 690. 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 277 closely related codes. Coders also document this condition as atypical Hantavirus disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

A98.5 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 141 for payment year 2027.

Code Identity

ICD-10-CM Code
A98.5
Billable Status
Yes — Valid for Submission
Code Describes
Hemorrhagic fever with renal syndrome
Short Description
Hemorrhagic fever with renal syndrome
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 CodeA98.5Hemorrhagic fever with renal syndrome

Medicare Risk Adjustment (HCC)Billing

A98.5 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Other CMS Models
ESRD (V21): HCC 141
ESRD V21 weights: 0.000 dialysis, 0.000 functioning graft
Part D (RxHCC)
Not mapped
A98.5 does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Atypical Hantavirus disease
  • Bhanja virus disease
  • Disease caused by Hantanvirus
  • Disease caused by Hantavirus
  • Hemorrhagic fever with renal syndrome
  • Puumala virus nephropathy

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A98.5: 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

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Epidemic hemorrhagic fever
  • Korean hemorrhagic fever
  • Russian hemorrhagic fever
  • Hantaan virus disease
  • Hantavirus disease with renal manifestations
  • Nephropathia epidemica
  • Songo fever

Excludes1

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

On A98.5 itself
  • hantavirus (cardio)-pulmonary syndrome (B33.4)
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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A98.5, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming A98.5: they are not reported together with it, unless the two conditions are unrelated.

  • B33.4 Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]
    hantavirus disease with renal manifestations (A98.5)
  • B33.4 Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]
    hemorrhagic fever with renal manifestations (A98.5)

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 with Renal Syndrome

    an acute febrile disease occurring predominately in asia. it is characterized by fever, prostration, vomiting, hemorrhagic phenonema, shock, and renal failure. it is caused by any one of several closely related species of the genus orthohantavirus. the most severe form is caused by hantaan virus whose natural host is the rodent apodemus agrarius. milder forms are caused by seoul virus and transmitted by the rodents rattus rattus and r. norvegicus, and the puumala virus with transmission by clethrionomys galreolus.

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 A98.5 to ICD-9-CMHistory

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

ICD-9-CM
078.6 Hem nephrosonephritis
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 A98.5Overview

What is the ICD-10 code for hemorrhagic fever with renal syndrome?

The ICD-10-CM code for hemorrhagic fever with renal syndrome is A98.5 (sometimes written as A985). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A98.5 (Other viral hemorrhagic fevers, not elsewhere classified) a billable code?

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

What MS-DRG does A98.5 group to?

When hemorrhagic fever with renal syndrome is the principal diagnosis on an inpatient stay, it groups to MS-DRG 689, 690, with relative weights from 0.8008 to 1.1415 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A98.5 a CC or MCC?

CMS lists A98.5 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 277 closely related codes in its exclusion list.

Can A98.5 be reported with B33.4?

Not as a rule. The Excludes1 note on A98.5 lists "hantavirus (cardio)-pulmonary syndrome (B33.4)". 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).

Does A98.5 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: A98.5 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 141 (Nephritis).