B05.0 Measles complicated by encephalitis

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

Applicable to

• Postmeasles encephalitis

Applies from B05 Measles

Includes

• morbilli

Excludes1 (never code together)

• subacute sclerosing panencephalitis (A81.1)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 055.0 Postmeasles encephalitis

Code annotations containing back-references to B05.0

Back-references to B05.0

• Type 1 Excludes: A85 Other viral encephalitis, not elsewhere classified ("encephalitis due to measles virus (B05.0)")
• Type 1 Excludes: G04.01 Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) ("post measles encephalitis (B05.0)")
• Type 1 Excludes: G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere ("encephalitis, myelitis and encephalomyelitis (in) measles (B05.0)")

Back-references to B05

• Code First: H67 Otitis media in diseases classified elsewhere ("viral disease NEC (B00-B34)")

Diagnosis Index entries for B05.0

• Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › in (due to) › measles
• Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › postmeasles
• Encephalomyelitis › postmeasles
• Measles (black) (hemorrhagic) (suppressed) › with › encephalitis

Nearby codes

• B05 Measles
• B05.0 Measles complicated by encephalitis (this code)
• B05.1 Measles complicated by meningitis
• B05.2 Measles complicated by pneumonia
• B05.3 Measles complicated by otitis media
• B05.4 Measles with intestinal complications
• B05.8 Measles with other complications