G37.4 Subacute necrotizing myelitis of central nervous system

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

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)

• 323.9 Unspecified causes of encephalitis, myelitis, and encephalomyelitis (approximate)
• 341.8 Other demyelinating diseases of central nervous system (approximate)

Code annotations containing back-references to G37.4

Back-references to G37.4

• Type 2 Excludes: G04 Encephalitis, myelitis and encephalomyelitis ("subacute necrotizing myelitis (G37.4)")

Diagnosis Index entries for G37.4

• Myelitis (acute) (ascending) (childhood) (chronic) (descending) (diffuse) (disseminated) (idiopathic) (pressure) (progressive) (spinal cord) (subacute) › necrotizing, subacute

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
• 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 (this code)
• G37.5 Concentric sclerosis [Balo] of central nervous system
• G37.8 Other specified demyelinating diseases of central nervous system
• G37.81 Myelin oligodendrocyte glycoprotein antibody disease
• G37.89 Other specified demyelinating diseases of central nervous system
• G37.9 Demyelinating disease of central nervous system, unspecified