B01 – Varicella [chickenpox]
ICD-10-CM 2027 diagnosis code · Viral infections characterized by skin and mucous membrane lesions
ICD-10-CM code
B01
- Code
B01(claims format:B01)- Description
- Varicella [chickenpox]
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- B00-B09 Viral infections characterized by skin and mucous membrane lesions
Billable codes under B01
B01 is a header code and cannot be used on claims. Choose the most specific code:
- B01.0 – Varicella meningitisBillable
- B01.1 – Varicella encephalitis, myelitis and encephalomyelitisHeader (more codes below)
- B01.2 – Varicella pneumoniaBillable
- B01.8 – Varicella with other complicationsHeader (more codes below)
- B01.9 – Varicella without complicationBillable
Frequently asked questions
What is ICD-10 code B01?
B01 is the ICD-10-CM code for varicella [chickenpox], in the block B00-B09 (Viral infections characterized by skin and mucous membrane lesions).
Is B01 a billable code?
No. B01 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.