| G252 | Other specified forms of tremor |
| G253 | Myoclonus |
| G254 | Drug-induced chorea |
| G255 | Other chorea |
| G256 | Drug induced tics and other tics of organic origin |
| G2561 | Drug induced tics |
| G2569 | Other tics of organic origin |
| G257 | Other and unspecified drug induced movement disorders |
| G2570 | Drug induced movement disorder, unspecified |
| G2571 | Drug induced akathisia |
| G2579 | Other drug induced movement disorders |
| G258 | Other specified extrapyramidal and movement disorders |
| G2581 | Restless legs syndrome |
| G2582 | Stiff-man syndrome |
| G2583 | Benign shuddering attacks |
| G2589 | Other specified extrapyramidal and movement disorders |
| G259 | Extrapyramidal and movement disorder, unspecified |
| G26 | Extrapyramidal and movement disord in diseases classd elswhr Extrapyramidal and movement disorders in diseases classified elsewhere |
| G30 | Alzheimer's disease |
| G300 | Alzheimer's disease with early onset |
| G301 | Alzheimer's disease with late onset |
| G308 | Other Alzheimer's disease |
| G309 | Alzheimer's disease, unspecified |
| G31 | Other degenerative diseases of nervous system, not elsewhere classified |
| G310 | Frontotemporal dementia |
| G3101 | Pick's disease |
| G3109 | Other frontotemporal neurocognitive disorder |
| G311 | Senile degeneration of brain, not elsewhere classified |
| G312 | Degeneration of nervous system due to alcohol |
| G318 | Other specified degenerative diseases of nervous system |
| G3180 | Leukodystrophy, unspecified |
| G3181 | Alpers disease |
| G3182 | Leigh's disease |
| G3183 | Neurocognitive disorder with Lewy bodies |
| G3184 | Mild cognitive impairment of uncertain or unknown etiology |
| G3185 | Corticobasal degeneration |
| G3186 | Alexander disease |
| G3189 | Other specified degenerative diseases of nervous system |
| G319 | Degenerative disease of nervous system, unspecified |
| G32 | Other degenerative disorders of nervous system in diseases classified elsewhere |
| G320 | Subacute combined degeneration of spinal cord in diseases classified elsewhere |
| G328 | Other specified degenerative disorders of nervous system in diseases classified elsewhere |
| G3281 | Cerebellar ataxia in diseases classified elsewhere |
| G3289 | Other specified degenerative disorders of nervous system in diseases classified elsewhere |
| G35 | Multiple sclerosis |
| G36 | Other acute disseminated demyelination |
| G360 | Neuromyelitis optica [Devic] |
| G361 | Acute and subacute hemorrhagic leukoencephalitis [Hurst] |
| G368 | Other specified acute disseminated demyelination |
| G369 | Acute disseminated demyelination, unspecified |