| MDC 1 Diseases & Disorders of the Nervous System |
| Multiple Sclerosis and Cerebellar Ataxia |
| G110 | Congenital nonprogressive ataxia |
| G111 | Early-onset cerebellar ataxia |
| G112 | Late-onset cerebellar ataxia |
| G113 | Cerebellar ataxia with defective DNA repair |
| G114 | Hereditary spastic paraplegia |
| G118 | Other hereditary ataxias |
| G119 | Hereditary ataxia, unspecified |
| G3281 | Cerebellar ataxia in diseases classified elsewhere |
| G35 | Multiple sclerosis |
| G360 | Neuromyelitis optica [Devic] |
| G361 | Acute and subacute hemorrhagic leukoencephalitis [Hurst] |
| G368 | Other specified acute disseminated demyelination |
| G369 | Acute disseminated demyelination, unspecified |
| G370 | Diffuse sclerosis of central nervous system |
| G371 | Central demyelination of corpus callosum |
| G372 | Central pontine myelinolysis |
| G375 | Concentric sclerosis [Balo] of central nervous system |
| G378 | Other specified demyelinating diseases of central nervous system |
| G379 | Demyelinating disease of central nervous system, unspecified |