B01: Varicella [chickenpox]
Codes under B01 (Varicella [chickenpox]). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| B01.0 | Varicella meningitis | ✓ |
| B01.0 | Varicella meningitis | ✓ |
| B01.1 | Varicella encephalitis, myelitis and encephalomyelitis | — |
| B01.1 | Varicella encephalitis, myelitis and encephalomyelitis | — |
| B01.2 | Varicella pneumonia | ✓ |
| B01.2 | Varicella pneumonia | ✓ |
| B01.8 | Varicella with other complications | — |
| B01.8 | Varicella with other complications | — |
| B01.9 | Varicella without complication | ✓ |
| B01.9 | Varicella without complication | ✓ |
| B01.11 | Varicella encephalitis and encephalomyelitis | ✓ |
| B01.11 | Varicella encephalitis and encephalomyelitis | ✓ |
| B01.12 | Varicella myelitis | ✓ |
| B01.12 | Varicella myelitis | ✓ |
| B01.81 | Varicella keratitis | ✓ |
| B01.81 | Varicella keratitis | ✓ |
| B01.89 | Other varicella complications | ✓ |
| B01.89 | Other varicella complications | ✓ |
Frequently asked questions
What is ICD-10-CM code B01?
B01 is an ICD-10-CM category covering Varicella [chickenpox]. It contains 18 more specific diagnosis codes, 14 of which are billable.
Is B01 a billable code?
No — B01 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example B01.0 — Varicella meningitis). 14 of the 18 codes under B01 are billable.
What codes fall under B01?
B01 includes B01.0, B01.0, B01.1, B01.1, B01.2, plus 13 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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