B01.11 Varicella encephalitis and encephalomyelitis

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Postchickenpox encephalitis and encephalomyelitis

Applies from B01.1 Varicella encephalitis, myelitis and encephalomyelitis

Applicable to

• Postchickenpox encephalitis, myelitis and encephalomyelitis

MS-DRG index

Defines the logic of DRG(s) 097-099 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 052.0 Postvaricella encephalitis (approximate)

Code annotations containing back-references to B01.11

Back-references to B01.1

• Type 1 Excludes: G04.01 Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) ("post chickenpox encephalitis (B01.1)")
• Type 1 Excludes: G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere ("postchickenpox encephalitis, myelitis and encephalomyelitis (B01.1-)")

Back-references to B01

• Type 2 Excludes: B10 Other human herpesviruses ("human herpesvirus 3 (B01.-, B02.-)")
• Type 2 Excludes: B10 Other human herpesviruses ("varicella (B01.-)")
• Code First: H67 Otitis media in diseases classified elsewhere ("viral disease NEC (B00-B34)")

Diagnosis Index entries for B01.11

• Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › postchickenpox
• Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › postvaricella
• Encephalomyelitis › postchickenpox
• Encephalomyelitis › postvaricella
• Varicella › with › encephalitis
• Varicella › with › encephalomyelitis

Nearby codes

• B01 Varicella [chickenpox]
• B01.0 Varicella meningitis
• B01.1 Varicella encephalitis, myelitis and encephalomyelitis
• B01.11 Varicella encephalitis and encephalomyelitis (this code)
• B01.12 Varicella myelitis
• B01.2 Varicella pneumonia
• B01.8 Varicella with other complications
• B01.81 Varicella keratitis
• B01.89 Other varicella complications