G37.8Other specified demyelinating diseases of central nervous system

G37.8 is the ICD-10-CM diagnosis code for other specified demyelinating diseases of central nervous system. It belongs to category G37 (other demyelinating diseases of central nervous system), block G35-G37 (demyelinating diseases of the central nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within G37, choose G37.8 (Other specified demyelinating diseases of central nervous system) only when documentation doesn't support a more specific option: diffuse sclerosis of central nervous system (G37.0), central demyelination of corpus callosum (G37.1), central pontine myelinolysis (G37.2), acute transverse myelitis in demyelinating disease of central nervous system (G37.3), subacute necrotizing myelitis of central nervous system (G37.4), Concentric sclerosis [Balo] of central nervous system (G37.5) and demyelinating disease of central nervous system, unspecified (G37.9).

To report this condition, pick the subcode that matches the documentation: G37.81 (disease) and G37.89 (system).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2024 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 341.8 (other demyelinating diseases of central nervous system).