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B01

Non-billable

Varicella [chickenpox]

B01 is the ICD-10-CM code for Varicella [chickenpox]. It is a non-billable category code — use a more specific child code such as B01.0 for billing.

Status
Header (non-billable)
Chapter
A00-B99
Subcodes
5
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

What this means — in plain language

MedlinePlus · NIH

Chickenpox is an infection caused by the varicella-zoster virus. Most cases are in children under age 15, but older children and adults can get it. It spreads very easily from one person to another. The classic symptom of chickenpox is an uncomfortable, itchy rash. The rash turns into fluid-filled blisters and eventually into scabs. It usually shows up on the face, chest, and back and then spreads to the rest of the…

Read more about Chickenpox 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 B01?
B01 is the ICD-10-CM code for "Varicella [chickenpox]". It falls under A00-B99 Certain infectious and parasitic diseases.
Is B01 a billable code?
No — B01 is a non-billable header code. Use a more specific child code (such as B01.0) for billing.
What are the subcodes of B01?
B01 has 5 more specific child codes, including B01.0, B01.1, B01.2.

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

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