G00–G99
Diseases of the Nervous System
Parkinson's, epilepsy, migraine, neuropathy
G90.0
Idiopathic peripheral autonomic neuropathy
Non-billable
G90.01
Carotid sinus syncope
Billable
G90.09
Other idiopathic peripheral autonomic neuropathy
Billable
G90.1
Familial dysautonomia [Riley-Day]
Billable
G90.2
Horner's syndrome
Billable
G90.3
Multi-system degeneration of the autonomic nervous system
Billable
G90.4
Autonomic dysreflexia
Billable
G90.5
Complex regional pain syndrome I (CRPS I)
Non-billable
G90.50
Complex regional pain syndrome I, unspecified
Billable
G90.51
Complex regional pain syndrome I of upper limb
Non-billable
G90.511
Complex regional pain syndrome I of right upper limb
Billable
G90.512
Complex regional pain syndrome I of left upper limb
Billable
G90.513
Complex regional pain syndrome I of upper limb, bilateral
Billable
G90.519
Complex regional pain syndrome I of unspecified upper limb
Billable
G90.52
Complex regional pain syndrome I of lower limb
Non-billable
G90.521
Complex regional pain syndrome I of right lower limb
Billable
G90.522
Complex regional pain syndrome I of left lower limb
Billable
G90.523
Complex regional pain syndrome I of lower limb, bilateral
Billable
G90.529
Complex regional pain syndrome I of unspecified lower limb
Billable
G90.59
Complex regional pain syndrome I of other specified site
Billable
G90.8
Other disorders of autonomic nervous system
Non-billable
G90.81
Serotonin syndrome
Billable
G90.89
Other disorders of autonomic nervous system
Billable
G90.9
Disorder of the autonomic nervous system, unspecified
Billable
G90.A
Postural orthostatic tachycardia syndrome [POTS]
Billable
G90.B
LMNB1-related autosomal dominant leukodystrophy
Billable
G91
Hydrocephalus
Non-billable
G91.0
Communicating hydrocephalus
Billable
G91.1
Obstructive hydrocephalus
Billable
G91.2
(Idiopathic) normal pressure hydrocephalus
Billable
G91.3
Post-traumatic hydrocephalus, unspecified
Billable
G91.4
Hydrocephalus in diseases classified elsewhere
Billable
G91.8
Other hydrocephalus
Billable
G91.9
Hydrocephalus, unspecified
Billable
G92
Toxic encephalopathy
Non-billable
G92.0
Immune effector cell-associated neurotoxicity syndrome
Non-billable
G92.00
Immune effector cell-associated neurotoxicity syndrome, grade unspecified
Billable
G92.01
Immune effector cell-associated neurotoxicity syndrome, grade 1
Billable
G92.02
Immune effector cell-associated neurotoxicity syndrome, grade 2
Billable
G92.03
Immune effector cell-associated neurotoxicity syndrome, grade 3
Billable
G92.04
Immune effector cell-associated neurotoxicity syndrome, grade 4
Billable
G92.05
Immune effector cell-associated neurotoxicity syndrome, grade 5
Billable
G92.8
Other toxic encephalopathy
Billable
G92.9
Unspecified toxic encephalopathy
Billable
G93
Other disorders of brain
Non-billable
G93.0
Cerebral cysts
Billable
G93.1
Anoxic brain damage, not elsewhere classified
Billable
G93.2
Benign intracranial hypertension
Billable
G93.3
Postviral and related fatigue syndromes
Non-billable
G93.31
Postviral fatigue syndrome
Billable
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