Viral infection of unspecified site (B34) ICD-10-CM
The B34 code range covers viral infection of unspecified site 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 B34 Range 8 codes · 7 billable
- B34 Viral infection of unspecified siteNon-billable
- B34.0 Adenovirus infection, unspecified
- B34.1 Enterovirus infection, unspecified
- B34.2 Coronavirus infection, unspecified
- B34.3 Parvovirus infection, unspecified
- B34.4 Papovavirus infection, unspecified
- B34.8 Other viral infections of unspecified site
- B34.9 Viral infection, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B34 range.
Viremia
The presence of viruses in the blood.
About the B34 Code Range
The ICD-10 code B34 covers "viral infection of unspecified site," providing a classification for viral infections where a specific location in the body is not identified. Subcategories include codes for different virus types like adenovirus (B34.0), enterovirus (B34.1), coronavirus (B34.2), parvovirus (B34.3), papovavirus (B34.4), other unspecified viral infections (B34.8), and a general unspecified viral infection code (B34.9).
These codes help medical coders and healthcare providers accurately record viral infections that do not involve a clearly defined site, or when the viral agent is identified but the exact infected location is unknown. For instance, B34.0 is used for adenovirus infections, which may also be referred to as "Simian adenovirus infection" or "adenovirus infection in immunocompromised person." Similarly, B34.1 includes enterovirus infections, covering conditions like Coxsackie virus disease and echovirus infection. The broad category B34.9 includes symptoms or syndromes like viral fever, viral arthritis, or viral labyrinthitis when the infection site is unspecified. Understanding these specifications assists in choosing the correct code for documentation, treatment, and epidemiological tracking of viral diseases where infection sites are not clearly pinpointed.
Questions About This Page
How many billable codes are in the B34 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 B34 range classify?
The range classifies viral infection of unspecified site. 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.
