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 2026, 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.
Anetoderma
Benign DERMATOSIS caused by a loss of dermal ELASTIC TISSUE resulting in localized sac-like areas of flaccid skin. It can be either primary (idiopathic) or secondary to other skin conditions, PENICILLAMINE use, or premature birth.
Varicella Zoster Virus Infection
Infection caused by HUMAN HERPES VIRUS 3 (e.g., CHICKENPOX and HERPES ZOSTER).
About the B01 Code Range
The ICD-10 code B01 represents varicella, commonly known as chickenpox, including its various complications. These codes help healthcare providers document and classify the infection precisely, from uncomplicated cases to serious complications affecting the brain, lungs, eyes, and other organs.
Specifically, B01 covers all types of varicella infections. For example, B01.0 is used for varicella meningitis, a viral infection of the brain's lining, while B01.1 classifies varicella encephalitis and myelitis—serious inflammations of the brain and spinal cord. Within this, B01.11 addresses post-infectious encephalitis, also called postvaricella encephalitis. Respiratory complications are coded as B01.2, known as chickenpox pneumonia or hemorrhagic varicella pneumonia. Eye involvement like keratitis is documented with B01.81. Other less common or neurological complications are grouped under B01.89, which includes issues like viral dermatitis of the eyelid and acute cerebellar ataxia caused by varicella. When no complications are present, B01.9 is the appropriate ICD-10 code for varicella.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
