| G838 | Other specified paralytic syndromes |
| G8381 | Brown-Sequard syndrome |
| G8382 | Anterior cord syndrome |
| G8383 | Posterior cord syndrome |
| G8384 | Todd's paralysis (postepileptic) |
| G8389 | Other specified paralytic syndromes |
| G839 | Paralytic syndrome, unspecified |
| G89 | Pain, not elsewhere classified |
| G890 | Central pain syndrome |
| G891 | Acute pain, not elsewhere classified |
| G8911 | Acute pain due to trauma |
| G8912 | Acute post-thoracotomy pain |
| G8918 | Other acute postprocedural pain |
| G892 | Chronic pain, not elsewhere classified |
| G8921 | Chronic pain due to trauma |
| G8922 | Chronic post-thoracotomy pain |
| G8928 | Other chronic postprocedural pain |
| G8929 | Other chronic pain |
| G893 | Neoplasm related pain (acute) (chronic) |
| G894 | Chronic pain syndrome |
| G90 | Disorders of autonomic nervous system |
| G900 | Idiopathic peripheral autonomic neuropathy |
| G9001 | Carotid sinus syncope |
| G9009 | Other idiopathic peripheral autonomic neuropathy |
| G901 | Familial dysautonomia [Riley-Day] |
| G902 | Horner's syndrome |
| G903 | Multi-system degeneration of the autonomic nervous system |
| G904 | Autonomic dysreflexia |
| G905 | Complex regional pain syndrome I (CRPS I) |
| G9050 | Complex regional pain syndrome I, unspecified |
| G9051 | Complex regional pain syndrome I of upper limb |
| G90511 | Complex regional pain syndrome I of right upper limb |
| G90512 | Complex regional pain syndrome I of left upper limb |
| G90513 | Complex regional pain syndrome I of upper limb, bilateral |
| G90519 | Complex regional pain syndrome I of unspecified upper limb |
| G9052 | Complex regional pain syndrome I of lower limb |
| G90521 | Complex regional pain syndrome I of right lower limb |
| G90522 | Complex regional pain syndrome I of left lower limb |
| G90523 | Complex regional pain syndrome I of lower limb, bilateral |
| G90529 | Complex regional pain syndrome I of unspecified lower limb |
| G9059 | Complex regional pain syndrome I of other specified site |
| G908 | Other disorders of autonomic nervous system |
| G9081 | Serotonin syndrome |
| G9089 | Other disorders of autonomic nervous system |
| G909 | Disorder of the autonomic nervous system, unspecified |
| G90A | Postural orthostatic tachycardia syndrome [POTS] |
| G90B | LMNB1-related autosomal dominant leukodystrophy |
| G91 | Hydrocephalus |
| G910 | Communicating hydrocephalus |
| G911 | Obstructive hydrocephalus |