B34.9
Viral infection, unspecified
B34.9 (also written B349) is a billable ICD-10-CM diagnosis code for viral infection, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 7 codes in category B34 (Viral infection of unspecified site). The Alphabetic Index lists it under 9 entries. Its coding notes include a Use additional code instruction, 6 Excludes1 entries and 5 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (5 notes)
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- diseases generally recognized as communicable or transmissible
Inclusion terms
Conditions classified to this code.
- Viremia NOS
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 9 entries
- Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute), in (due to), viral disease NEC
- Disease, diseased, nonarthropod-borne NOS (viral)
- Disease, diseased, viral, virus
- Disease, diseased, viral, virus, nonarthropod-borne NOS
- Infection, infected, infective (opportunistic), virus, viral NOS
- Infection, infected, infective (opportunistic), virus, viral NOS, unspecified nature or site
- Otitis (acute), externa, in (due to), viral disease NEC
- Syndrome, virus
- Viremia