B01.12 Varicella myelitis

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

Applicable to

• Postchickenpox myelitis

Applies from B01.1 Varicella encephalitis, myelitis and encephalomyelitis

Applicable to

• Postchickenpox encephalitis, myelitis and encephalomyelitis

Risk adjustment (HCC)

• CMS-HCC V28: HCC 182 — Spinal Cord Disorders/Injuries
• CMS-HCC V22: HCC 72 — Spinal Cord Disorders/Injuries
• RxHCC V08: HCC 155 — Spinal Cord Disorders
• ESRD V24: HCC 72

MS-DRG index

Defines the logic of DRG(s) 023-024 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 052.2 Postvaricella myelitis

Code annotations containing back-references to B01.12

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 B01.12

• Myelitis (acute) (ascending) (childhood) (chronic) (descending) (diffuse) (disseminated) (idiopathic) (pressure) (progressive) (spinal cord) (subacute) › postchickenpox
• Myelitis (acute) (ascending) (childhood) (chronic) (descending) (diffuse) (disseminated) (idiopathic) (pressure) (progressive) (spinal cord) (subacute) › varicella
• Varicella › with › myelitis

Nearby codes

• B01 Varicella [chickenpox]
• B01.0 Varicella meningitis
• B01.1 Varicella encephalitis, myelitis and encephalomyelitis
• B01.11 Varicella encephalitis and encephalomyelitis
• B01.12 Varicella myelitis (this code)
• B01.2 Varicella pneumonia
• B01.8 Varicella with other complications
• B01.81 Varicella keratitis
• B01.89 Other varicella complications
• B01.9 Varicella without complication