G00–G99
Diseases of the Nervous System
Parkinson's, epilepsy, migraine, neuropathy
G11.19
Other early-onset cerebellar ataxia
Billable
G11.2
Late-onset cerebellar ataxia
Billable
G11.3
Cerebellar ataxia with defective DNA repair
Billable
G11.4
Hereditary spastic paraplegia
Billable
G11.5
Hypomyelination - hypogonadotropic hypogonadism - hypodontia
Billable
G11.6
Leukodystrophy with vanishing white matter disease
Billable
G11.8
Other hereditary ataxias
Billable
G11.9
Hereditary ataxia, unspecified
Billable
G12
Spinal muscular atrophy and related syndromes
Non-billable
G12.0
Infantile spinal muscular atrophy, type I [Werdnig-Hoffman]
Billable
G12.1
Other inherited spinal muscular atrophy
Billable
G12.2
Motor neuron disease
Non-billable
G12.20
Motor neuron disease, unspecified
Billable
G12.21
Amyotrophic lateral sclerosis
Billable
G12.22
Progressive bulbar palsy
Billable
G12.23
Primary lateral sclerosis
Billable
G12.24
Familial motor neuron disease
Billable
G12.25
Progressive spinal muscle atrophy
Billable
G12.29
Other motor neuron disease
Billable
G12.8
Other spinal muscular atrophies and related syndromes
Billable
G12.9
Spinal muscular atrophy, unspecified
Billable
G13
Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere
Non-billable
G13.0
Paraneoplastic neuromyopathy and neuropathy
Billable
G13.1
Other systemic atrophy primarily affecting central nervous system in neoplastic disease
Billable
G13.2
Systemic atrophy primarily affecting the central nervous system in myxedema
Billable
G13.8
Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere
Billable
G14
Postpolio syndrome
Billable
G20
Parkinson's disease
Non-billable
G20.A
Parkinson's disease without dyskinesia
Non-billable
G20.A1
Parkinson's disease without dyskinesia, without mention of fluctuations
Billable
G20.A2
Parkinson's disease without dyskinesia, with fluctuations
Billable
G20.B
Parkinson's disease with dyskinesia
Non-billable
G20.B1
Parkinson's disease with dyskinesia, without mention of fluctuations
Billable
G20.B2
Parkinson's disease with dyskinesia, with fluctuations
Billable
G20.C
Parkinsonism, unspecified
Billable
G21
Secondary parkinsonism
Non-billable
G21.0
Malignant neuroleptic syndrome
Billable
G21.1
Other drug-induced secondary parkinsonism
Non-billable
G21.11
Neuroleptic induced parkinsonism
Billable
G21.19
Other drug induced secondary parkinsonism
Billable
G21.2
Secondary parkinsonism due to other external agents
Billable
G21.3
Postencephalitic parkinsonism
Billable
G21.4
Vascular parkinsonism
Billable
G21.8
Other secondary parkinsonism
Billable
G21.9
Secondary parkinsonism, unspecified
Billable
G23
Other degenerative diseases of basal ganglia
Non-billable
G23.0
Hallervorden-Spatz disease
Billable
G23.1
Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
Billable
G23.2
Striatonigral degeneration
Billable
G23.3
Hypomyelination with atrophy of the basal ganglia and cerebellum
Billable
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