| G912 | (Idiopathic) normal pressure hydrocephalus |
| G913 | Post-traumatic hydrocephalus, unspecified |
| G914 | Hydrocephalus in diseases classified elsewhere |
| G918 | Other hydrocephalus |
| G919 | Hydrocephalus, unspecified |
| G92 | Toxic encephalopathy |
| G920 | Immune effector cell-associated neurotoxicity syndrome |
| G9200 | Immune effector cell-associated neurotoxicity syndrome, grade unspecified |
| G9201 | Immune effector cell-associated neurotoxicity syndrome, grade 1 |
| G9202 | Immune effector cell-associated neurotoxicity syndrome, grade 2 |
| G9203 | Immune effector cell-associated neurotoxicity syndrome, grade 3 |
| G9204 | Immune effector cell-associated neurotoxicity syndrome, grade 4 |
| G9205 | Immune effector cell-associated neurotoxicity syndrome, grade 5 |
| G928 | Other toxic encephalopathy |
| G929 | Unspecified toxic encephalopathy |
| G93 | Other disorders of brain |
| G930 | Cerebral cysts |
| G931 | Anoxic brain damage, not elsewhere classified |
| G932 | Benign intracranial hypertension |
| G933 | Postviral and related fatigue syndromes |
| G9331 | Postviral fatigue syndrome |
| G9332 | Myalgic encephalomyelitis/chronic fatigue syndrome |
| G9339 | Other post infection and related fatigue syndromes |
| G934 | Other and unspecified encephalopathy |
| G9340 | Encephalopathy, unspecified |
| G9341 | Metabolic encephalopathy |
| G9342 | Megalencephalic leukoencephalopathy with subcortical cysts |
| G9343 | Leukoencephalopathy with calcifications and cysts |
| G9344 | Adult-onset leukodystrophy with axonal spheroids |
| G9345 | Developmental and epileptic encephalopathy |
| G9349 | Other encephalopathy |
| G935 | Compression of brain |
| G936 | Cerebral edema |
| G937 | Reye's syndrome |
| G938 | Other specified disorders of brain |
| G9381 | Temporal sclerosis |
| G9382 | Brain death |
| G9389 | Other specified disorders of brain |
| G939 | Disorder of brain, unspecified |
| G94 | Other disorders of brain in diseases classified elsewhere |
| G95 | Other and unspecified diseases of spinal cord |
| G950 | Syringomyelia and syringobulbia |
| G951 | Vascular myelopathies |
| G9511 | Acute infarction of spinal cord (embolic) (nonembolic) |
| G9519 | Other vascular myelopathies |
| G952 | Other and unspecified cord compression |
| G9520 | Unspecified cord compression |
| G9529 | Other cord compression |
| G958 | Other specified diseases of spinal cord |
| G9581 | Conus medullaris syndrome |