Get started free

B33

Non-billable

Other viral diseases, not elsewhere classified

B33 is the ICD-10-CM code for Other viral diseases, not elsewhere classified. It is a non-billable category code — use a more specific child code such as B33.0 for billing.

Status
Header (non-billable)
Chapter
A00-B99
Subcodes
6
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.

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code B33?
B33 is the ICD-10-CM code for "Other viral diseases, not elsewhere classified". It falls under A00-B99 Certain infectious and parasitic diseases.
Is B33 a billable code?
No — B33 is a non-billable header code. Use a more specific child code (such as B33.0) for billing.
What are the subcodes of B33?
B33 has 6 more specific child codes, including B33.0, B33.1, B33.2.

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

Look up another ICD-10 code or condition

Powered by Eleplan

Free ICD-10 lookup is just the start. Eleplan keeps the whole care plan in one place.

Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, with Ellie, your AI care assistant, on top of it. Free to start.

Get started freeSee how Eleplan works →