Other viral diseases (B25-B34) ICD-10-CM
The B25–B34 section covers other viral diseases with 67 ICD-10-CM diagnosis codes, of which 55 are billable in fiscal year 2026. The section is organized into the 6 code ranges listed below.
Code Ranges in This Section 6 ranges · 67 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the B25–B34 Code Range
ICD-10 codes B25-B34 cover a variety of viral diseases beyond common infections, including specific conditions caused by cytomegalovirus, mumps, infectious mononucleosis, viral conjunctivitis, and other uncommon viral infections. These codes provide a detailed way to classify viral illnesses affecting different organs or systems.
For example, B25 codes represent cytomegaloviral diseases, including specialized conditions like cytomegaloviral pneumonitis (B25.0) or cytomegaloviral hepatitis (B25.1). Similarly, B26 codes apply to mumps and its complications such as orchitis and meningitis. The infectious mononucleosis group (B27) distinguishes types caused by Epstein-Barr virus and cytomegalovirus, including related nervous system complications. Codes under B30 specify viral conjunctivitis often due to adenovirus. The range B33 includes diverse viral conditions like viral myocarditis or infections due to retroviruses. Lastly, B34 identifies viral infections of unspecified sites, including adenovirus, enterovirus, coronavirus, and other unspecified viral infections.These codes help clinicians and coders capture specific viral diseases accurately for diagnosis and reporting.
Questions About This Page
How many codes are in the B25-B34 range?
The B25-B34 range contains 67 ICD-10-CM diagnosis codes in FY 2026. 55 of them are billable, and the rest are category headers that organize the section.
What conditions does B25-B34 cover?
The range covers other viral diseases. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
