2026 ICD-10-CM Diagnosis Code B33.8Other specified viral diseases
ICD-10-CM Codes›A00–B99›B25-B34›B33
- Billable — Valid for Submission
- Not Chronic
B33.8 is a billable ICD-10-CM diagnosis code for other specified viral diseases. 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
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute infectious lymphocytosis
- Banzi virus disease
- Bussuquara virus disease
- California serogroup virus non-neuroinvasive disease
- Candidu virus disease
- Coxsackie virus hepatitis
- Disease caused by Alphavirus
- Disease caused by Aphthovirus
- Disease caused by Arenavirus
- Disease caused by Birnavirus
- Disease caused by Bunyaviridae
- Disease caused by Calicivirus
- Disease caused by California serogroup virus
- Disease caused by Circoviridae
- Disease caused by Filoviridae
- Disease caused by Flavivirus
- Disease caused by Lone star virus
- Disease caused by Lyssavirus
- Disease caused by Morbillivirus
- Disease caused by Nairovirus
- Disease caused by Orthobunyavirus
- Disease caused by Paramyxovirinae
- Disease caused by Phlebovirus
- Disease caused by Pneumovirus
- Disease caused by Respirovirus
- Disease caused by Rubivirus
- Disease caused by Vesiculovirus
- Duvenhage virus disease
- Everglades virus disease
- Hepatitis in coxsackie viral disease
- Infection caused by Henipavirus
- Infection caused by Nipah virus
- Infectious lymphocytosis
- Jamestown Canyon virus disease
- Le Dantec virus disease
- Lymphocystis disease
- Mokola virus disease
- Ockelbo disease
- Pichinde virus disease
- Punta Toro virus disease
- Sepik fever
- Spondweni fever
- Tacaribe virus disease
- Tahyna fever
- Viral arthritis
- Viral encephalomyelocarditis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- anogenital human papillomavirus infection A63.0
- viral warts due to human papillomavirus infection B07
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Aujeszky's disease - B33.8
- Coxsackie (virus) (infection) - B34.1
- specific disease NEC - B33.8
- Disease, diseased - See Also: Syndrome;
- Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) - R50.9
- Tahyna - B33.8
- Lymphocytosis (symptomatic) - D72.820
- infectious (acute) - B33.8
- Tahyna fever - B33.8
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Aujeszky's disease
- Coxsackie(virus) (infection)
- specific disease NEC
- Disease, diseased
- viral, virus
- Tahyna
- Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- Tahyna
- Hepatitis
- viral, virus
- coxsackie
- Infection, infected, infective(opportunistic)
- virus, viral NOS
- specified type NEC
- Lymphocytosis(symptomatic)
- infectious (acute)
- Tahyna fever
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Viral Infections
Viruses are very tiny germs. They are made of genetic material (either DNA or RNA) inside of a protein coating. There are a huge number of viruses on earth. Only a small number of them can infect humans. Those viruses can infect our cells, which may cause disease.
The full article covers:
- What are viruses?
- How are viruses spread?
- How do viruses cause disease?
- What are the treatments for viral infections?
- Can viral infections be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B33.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B33.8Overview
Is B33.8 (Other viral diseases, not elsewhere classified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified viral diseases on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does B33.8 group to?
When other specified viral diseases 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 B33.8?
Under the General Equivalence Mappings, other specified viral diseases converts to ICD-9-CM 078.2 (sweating fever), 078.89 (oth spec dis viruses), and 079.89 (oth specf viral infectn). 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.
