Varicella [chickenpox] (B01) ICD-10-CM
The B01 code range covers varicella [chickenpox] with 10 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the B01 Range 10 codes · 7 billable
- B01 Varicella [chickenpox]Non-billable
- B01.0 Varicella meningitis
- B01.1 Varicella encephalitis, myelitis and encephalomyelitisNon-billable
- B01.11 Varicella encephalitis and encephalomyelitis
- B01.12 Varicella myelitis
- B01.2 Varicella pneumonia
- B01.8 Varicella with other complicationsNon-billable
- B01.81 Varicella keratitis
- B01.89 Other varicella complications
- B01.9 Varicella without complication
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B01 range.
Chickenpox
A highly contagious infectious disease caused by the varicella-zoster virus (HERPESVIRUS 3, HUMAN). It usually affects children, is spread by direct contact or respiratory route via droplet nuclei, and is characterized by the appearance on the skin and mucous membranes of successive crops of typical pruritic vesicular lesions that are easily broken and become scabbed. Chickenpox is relatively benign in children, but may be complicated by pneumonia and encephalitis in adults. (From Dorland, 27th ed)
About the B01 Code Range
Varicella, also called chickenpox, is grouped with viral infections characterized by skin and mucous membrane lesions. Its codes distinguish cases with complications from cases without them.
B01.0 identifies meningitis. B01.1 separates encephalitis and encephalomyelitis (B01.11) from myelitis (B01.12). B01.2 identifies pneumonia. B01.8 separates keratitis (B01.81) from other complications (B01.89). B01.9 identifies varicella without complication.
Questions About This Page
How many billable codes are in the B01 range?
Of the 10 codes in this range, 7 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the B01 range classify?
The range classifies varicella [chickenpox]. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
