B01.1Header code — not billable
Varicella encephalitis, myelitis and encephalomyelitis
- Chapter
- 1. Certain infectious and parasitic diseases
- Category
- B01
- Effective date
- October 1, 2026
Related codes in category B01
B01Varicella [chickenpox]B01.0Varicella meningitisYesB01.11Varicella 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 B01.1?
B01.1 is an ICD-10-CM diagnosis code for Varicella encephalitis, myelitis and encephalomyelitis.
Is B01.1 a billable code?
No. B01.1 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 B01.1 in?
B01.1 falls under Chapter 1: Certain infectious and parasitic diseases.
When did B01.1 become effective?
B01.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to B01.1?
B01.1 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.