2026 ICD-10-CM Diagnosis Code B33.4Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]
ICD-10-CM Codes›A00–B99›B25-B34›B33
- Billable — Valid for Submission
- Not Chronic
B33.4 is a billable ICD-10-CM diagnosis code for hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]. 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. Coders also document this condition as disease caused by Hantavirus. 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.
- Disease caused by Hantavirus
- Hantavirus pulmonary syndrome
- Sin Nombre virus encephalitis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Hantavirus disease with pulmonary manifestations
- Sin nombre virus disease
Use Additional Code
- code to identify any associated acute kidney failure N17.9
Type 1 Excludes
- hantavirus disease with renal manifestations A98.5
- hemorrhagic fever with renal manifestations A98.5
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
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.
- Disease, diseased - See Also: Syndrome;
- sin nombre virus - B33.4
- Syndrome - See Also: Disease;
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Disease, diseased
- Hantavirus, with pulmonary manifestations
- Disease, diseased
- sin nombre virus
- Disease, diseased
- viral, virus
- Hanta (with renal manifestations) (Dobrava) (Puumala) (Seoul)
- with pulmonary manifestations (Andes) (Bayou) (Bermejo) (Black Creek Canal) (Choclo) (Juquitiba) (Laguna negra) (Lechiguanas) (New York) (Oran) (Sin nombre)
- Disease, diseased
- viral, virus
- Sin nombre (Hantavirus) (cardio)-pulmonary syndrome)
- Hantavirus disease(with renal manifestations) (Dobrava) (Puumala) (Seoul)
- with pulmonary manifestations (Andes) (Bayou) (Bermejo) (Black Creek Canal) (Choclo) (Juquitiba) (Laguna negra) (Lechiguanas) (New York) (Oran) (Sin nombre)
- Sin Nombre virus disease(Hantavirus) (cardio)-pulmonary syndrome
- Syndrome
- hantavirus (cardio)-pulmonary (HPS) (HCPS)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Hantavirus Pulmonary Syndrome
acute respiratory illness in humans caused by the sin nombre virus whose primary rodent reservoir is the deer mouse peromyscus maniculatus. first identified in the southwestern united states, this syndrome is characterized most commonly by fever, myalgias, headache, cough, and rapid respiratory failure.Sin Nombre virus
a species of orthohantavirus which emerged in the four corners area of the united states in 1993. it causes a serious, often fatal pulmonary illness (hantavirus pulmonary syndrome) in humans. transmission is by inhaling aerosolized rodent secretions that contain virus particles, carried especially by deer mice (peromyscus maniculatus) and pinyon mice (p. truei).Hantavirus Pulmonary Syndrome
an infection caused by hantaviruses. it manifests with flu-like symptoms but it rapidly progresses to life-threatening respiratory problems.
Patient EducationClinical
Hantavirus Infections
Hantavirus pulmonary syndrome (HPS) is a rare but deadly viral infection. It is spread by mice and rats. They shed the virus in their urine, droppings, and saliva. Tiny droplets with the virus can enter the air. People can get the disease if they breathe infected air or come into contact with rodents or their urine or droppings.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B33.4 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B33.4Overview
Is B33.4 (Other viral diseases, not elsewhere classified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does B33.4 group to?
When hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS] 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 B33.4?
Under the General Equivalence Mappings, hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS] converts to ICD-9-CM 079.81 (hantavirus infection). 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.
