Other viral hemorrhagic fevers, not elsewhere classified (A98) ICD-10-CM
The A98 code range covers other viral hemorrhagic fevers, not elsewhere classified with 8 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the A98 Range 8 codes · 7 billable
- A98 Other viral hemorrhagic fevers, not elsewhere classifiedNon-billable
- A98.0 Crimean-Congo hemorrhagic fever
- A98.1 Omsk hemorrhagic fever
- A98.2 Kyasanur Forest disease
- A98.3 Marburg virus disease
- A98.4 Ebola virus disease
- A98.5 Hemorrhagic fever with renal syndrome
- A98.8 Other specified viral hemorrhagic fevers
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A98 range.
Encephalitis Viruses, Tick-Borne
A subgroup of the genus FLAVIVIRUS that causes encephalitis and hemorrhagic fevers and is found in eastern and western Europe and the former Soviet Union. It is transmitted by TICKS and there is an associated milk-borne transmission from viremic cattle, goats, and sheep.
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.
Kyasanur Forest Disease
Tick-borne flavivirus infection occurring in the Kyasanur Forest in India.
Marburg Virus Disease
An RNA virus infection of rhesus, vervet, and squirrel monkeys transmissible to man.
RNA
A polynucleotide consisting essentially of chains with a repeating backbone of phosphate and ribose units to which nitrogenous bases are attached. RNA is unique among biological macromolecules in that it can encode genetic information, serve as an abundant structural component of cells, and also possesses catalytic activity. (Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed)
About the A98 Code Range
ICD-10 code section A98 covers various rare and serious viral hemorrhagic fevers that are not classified elsewhere. These codes identify specific viral infections known for causing severe bleeding disorders.
This section includes diseases such as Crimean-Congo hemorrhagic fever (A98.0), often referred to as a Nairovirus-caused disease or Hazara hemorrhagic fever, and Omsk hemorrhagic fever (A98.1). It also covers Kyasanur Forest disease (A98.2), linked to encephalitis caused by the Kyasanur Forest disease virus. The section further classifies filovirus-related conditions like Marburg virus disease (A98.3) and the more widely known Ebola virus disease (A98.4), which includes variants such as Zaire and Sudan ebolavirus. Additionally, Hemorrhagic fever with renal syndrome (A98.5) is noted, caused by hantaviruses and sometimes called Puumala virus nephropathy. Lastly, code A98.8 is for other specified viral hemorrhagic fevers, including Brazilian hemorrhagic fever and infections caused by the Sabia virus. These ICD-10 codes help healthcare providers accurately document and track these life-threatening viral hemorrhagic conditions.
Questions About This Page
How many billable codes are in the A98 range?
Of the 8 codes in this range, 7 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the A98 range classify?
The range classifies other viral hemorrhagic fevers, not elsewhere classified. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
