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B34

Non-billable

Viral infection of unspecified site

B34 is the ICD-10-CM code for Viral infection of unspecified site. It is a non-billable category code — use a more specific child code such as B34.0 for billing.

Status
Header (non-billable)
Chapter
A00-B99
Subcodes
7
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

What this means — in plain language

MedlinePlus · NIH

What are viruses? Viruses are very tiny germs. They are made of genetic material (either DNA or RNA) inside of a protein coating. There are a huge number of viruses on earth. Only a small number of them can infect humans. Those viruses can infect our cells, which may cause disease. Some of the diseases that viruses can cause include the common cold , the flu , COVID-19 , and HIV . How are viruses spread? Viruses can…

Read more about Viral Infections at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes1 — not coded here

  • •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?
B34 is the ICD-10-CM code for "Viral infection of unspecified site". It falls under A00-B99 Certain infectious and parasitic diseases.
Is B34 a billable code?
No — B34 is a non-billable header code. Use a more specific child code (such as B34.0) for billing.
What are the subcodes of B34?
B34 has 7 more specific child codes, including B34.0, B34.1, B34.2.
What is excluded from B34?
Excludes1 (not coded here): anogenital human papillomavirus infection (A63.0); cytomegaloviral disease NOS (B25.9); herpesvirus [herpes simplex] infection NOS (B00.9); retrovirus infection NOS (B33.3).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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