B34
⚠ Non-billable
Viral infection of unspecified site
ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases
Code
B34
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Certain Infectious and Parasitic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Excludes1 — never code together
- anogenital human papillomavirus infection (A63.0)
- cytomegaloviral disease NOS (B25.9)
- herpesvirus [herpes simplex] infection NOS (B00.9)
- retrovirus infection NOS (B33.3)
- viral agents as the cause of diseases classified elsewhere (B97.-)
- viral warts due to human papillomavirus infection (B07)
Frequently asked questions
What is ICD-10 code B34?
ICD-10-CM code B34 represents Viral infection of unspecified site. It is a non-billable header code requiring a more specific subcategory in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is B34 billable?
No. B34 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is B34 in?
B34 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.
Related codes in the B34 category
B34.0
Adenovirus infection, unspecified
Billable
B34.1
Enterovirus infection, unspecified
Billable
B34.2
Coronavirus infection, unspecified
Billable
B34.3
Parvovirus infection, unspecified
Billable
B34.4
Papovavirus infection, unspecified
Billable
B34.8
Other viral infections of unspecified site
Billable
B34.9
Viral infection, unspecified
Billable
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