G36.9 Acute disseminated demyelination, unspecified

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

Applies from G36 Other acute disseminated demyelination

Excludes1 (never code together)

• postinfectious encephalitis and encephalomyelitis NOS (G04.01)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 198 — Multiple Sclerosis
• CMS-HCC V22: HCC 77 — Multiple Sclerosis
• ESRD V24: HCC 77

MS-DRG index

Defines the logic of DRG(s) 058-060 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 341.9 Demyelinating disease of central nervous system, unspecified (approximate)

Diagnosis Index entries for G36.9

• Demyelination, demyelinization › disseminated, acute
• Neuromyelitis

Nearby codes

• G36 Other acute disseminated demyelination
• G36.0 Neuromyelitis optica [Devic]
• G36.1 Acute and subacute hemorrhagic leukoencephalitis [Hurst]
• G36.8 Other specified acute disseminated demyelination
• G36.9 Acute disseminated demyelination, unspecified (this code)