G37.1 Central demyelination of corpus callosum

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

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)

• 341.8 Other demyelinating diseases of central nervous system (approximate)

Diagnosis Index entries for G37.1

• Demyelination, demyelinization › corpus callosum (central)
• Encephalopathy (acute) › demyelinating callosal
• Marchiafava (-Bignami) syndrome or disease

Nearby codes

• G37 Other demyelinating diseases of central nervous system
• G37.0 Diffuse sclerosis of central nervous system
• G37.1 Central demyelination of corpus callosum (this code)
• G37.2 Central pontine myelinolysis
• G37.3 Acute transverse myelitis in demyelinating disease of central nervous system
• G37.4 Subacute necrotizing myelitis of central nervous system
• G37.5 Concentric sclerosis [Balo] of central nervous system
• G37.8 Other specified demyelinating diseases of central nervous system