G00–G99
Diseases of the Nervous System
Parkinson's, epilepsy, migraine, neuropathy
G31.83
Neurocognitive disorder with Lewy bodies
Billable
G31.84
Mild cognitive impairment of uncertain or unknown etiology
Billable
G31.85
Corticobasal degeneration
Billable
G31.86
Alexander disease
Billable
G31.87
Primary progressive apraxia of speech
Billable
G31.89
Other specified degenerative diseases of nervous system
Billable
G31.9
Degenerative disease of nervous system, unspecified
Billable
G32
Other degenerative disorders of nervous system in diseases classified elsewhere
Non-billable
G32.0
Subacute combined degeneration of spinal cord in diseases classified elsewhere
Billable
G32.8
Other specified degenerative disorders of nervous system in diseases classified elsewhere
Non-billable
G32.81
Cerebellar ataxia in diseases classified elsewhere
Billable
G32.89
Other specified degenerative disorders of nervous system in diseases classified elsewhere
Billable
G35
Multiple sclerosis
Non-billable
G35.A
Relapsing-remitting multiple sclerosis
Billable
G35.B
Primary progressive multiple sclerosis
Non-billable
G35.B0
Primary progressive multiple sclerosis, unspecified
Billable
G35.B1
Active primary progressive multiple sclerosis
Billable
G35.B2
Non-active primary progressive multiple sclerosis
Billable
G35.C
Secondary progressive multiple sclerosis
Non-billable
G35.C0
Secondary progressive multiple sclerosis, unspecified
Billable
G35.C1
Active secondary progressive multiple sclerosis
Billable
G35.C2
Non-active secondary progressive multiple sclerosis
Billable
G35.D
Multiple sclerosis, unspecified
Billable
G36
Other acute disseminated demyelination
Non-billable
G36.0
Neuromyelitis optica [Devic]
Billable
G36.1
Acute and subacute hemorrhagic leukoencephalitis [Hurst]
Billable
G36.8
Other specified acute disseminated demyelination
Billable
G36.9
Acute disseminated demyelination, unspecified
Billable
G37
Other demyelinating diseases of central nervous system
Non-billable
G37.0
Diffuse sclerosis of central nervous system
Billable
G37.1
Central demyelination of corpus callosum
Billable
G37.2
Central pontine myelinolysis
Billable
G37.3
Acute transverse myelitis in demyelinating disease of central nervous system
Billable
G37.4
Subacute necrotizing myelitis of central nervous system
Billable
G37.5
Concentric sclerosis [Balo] of central nervous system
Billable
G37.8
Other specified demyelinating diseases of central nervous system
Non-billable
G37.81
Myelin oligodendrocyte glycoprotein antibody disease
Billable
G37.89
Other specified demyelinating diseases of central nervous system
Billable
G37.9
Demyelinating disease of central nervous system, unspecified
Billable
G40
Epilepsy and recurrent seizures
Non-billable
G40.0
Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset
Non-billable
G40.00
Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable
Non-billable
G40.001
Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus
Billable
G40.009
Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus
Billable
G40.01
Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable
Non-billable
G40.011
Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus
Billable
G40.019
Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus
Billable
G40.1
Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures
Non-billable
G40.10
Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable
Non-billable
G40.101
Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with status epilepticus
Billable
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