B01Header code — not billable
Varicella [chickenpox]
- Chapter
- 1. Certain infectious and parasitic diseases
- Category
- B01
- Effective date
- October 1, 2026
Related codes in category B01
B01.0Varicella meningitisYesB01.1Varicella encephalitis, myelitis and encephalomyelitisB01.11Varicella encephalitis and encephalomyelitisYesB01.12Varicella myelitisYesB01.2Varicella pneumoniaYesB01.8Varicella with other complicationsB01.81Varicella keratitisYesB01.89Other varicella complicationsYesB01.9Varicella without complicationYes
Frequently asked questions
What is ICD-10 code B01?
B01 is an ICD-10-CM diagnosis code for Varicella [chickenpox].
Is B01 a billable code?
No. B01 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is B01 in?
B01 falls under Chapter 1: Certain infectious and parasitic diseases.
When did B01 become effective?
B01 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to B01?
B01 belongs to category B01, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.