| G00 | Bacterial meningitis, not elsewhere classified |
| G00.0 | Hemophilus meningitis |
| G00.1 | Pneumococcal meningitis |
| G00.2 | Streptococcal meningitis |
| G00.3 | Staphylococcal meningitis |
| G00.8 | Other bacterial meningitis |
| G00.9 | Bacterial meningitis, unspecified |
| G01 | Meningitis in bacterial diseases classified elsewhere |
| G02 | Meningitis in other infectious and parasitic diseases classified elsewhere |
| G03 | Meningitis due to other and unspecified causes |
| G03.0 | Nonpyogenic meningitis |
| G03.1 | Chronic meningitis |
| G03.2 | Benign recurrent meningitis [Mollaret] |
| G03.8 | Meningitis due to other specified causes |
| G03.9 | Meningitis, unspecified |
| G04 | Encephalitis, myelitis and encephalomyelitis |
| G04.0 | Acute disseminated encephalitis and encephalomyelitis (ADEM) |
| G04.00 | Acute disseminated encephalitis and encephalomyelitis, unspecified |
| G04.01 | Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) |
| G04.02 | Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis |
| G04.1 | Tropical spastic paraplegia |
| G04.2 | Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified |
| G04.3 | Acute necrotizing hemorrhagic encephalopathy |
| G04.30 | Acute necrotizing hemorrhagic encephalopathy, unspecified |
| G04.31 | Postinfectious acute necrotizing hemorrhagic encephalopathy |
| G04.32 | Postimmunization acute necrotizing hemorrhagic encephalopathy |
| G04.39 | Other acute necrotizing hemorrhagic encephalopathy |
| G04.8 | Other encephalitis, myelitis and encephalomyelitis |
| G04.81 | Other encephalitis and encephalomyelitis |
| G04.89 | Other myelitis |
| G04.9 | Encephalitis, myelitis and encephalomyelitis, unspecified |
| G04.90 | Encephalitis and encephalomyelitis, unspecified |
| G04.91 | Myelitis, unspecified |
| G05 | Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere |
| G05.3 | Encephalitis and encephalomyelitis in diseases classified elsewhere |
| G05.4 | Myelitis in diseases classified elsewhere |
| G06 | Intracranial and intraspinal abscess and granuloma |
| G06.0 | Intracranial abscess and granuloma |
| G06.1 | Intraspinal abscess and granuloma |
| G06.2 | Extradural and subdural abscess, unspecified |
| G07 | Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere |
| G08 | Intracranial and intraspinal phlebitis and thrombophlebitis |
| G09 | Sequelae of inflammatory diseases of central nervous system |
| G10 | Huntington's disease |
| G11 | Hereditary ataxia |
| G11.0 | Congenital nonprogressive ataxia |
| G11.1 | Early-onset cerebellar ataxia |
| G11.2 | Late-onset cerebellar ataxia |
| G11.3 | Cerebellar ataxia with defective DNA repair |
| G11.4 | Hereditary spastic paraplegia |
| G11.8 | Other hereditary ataxias |
| G11.9 | Hereditary ataxia, unspecified |
| G12 | Spinal muscular atrophy and related syndromes |
| G12.0 | Infantile spinal muscular atrophy, type I [Werdnig-Hoffman] |
| G12.1 | Other inherited spinal muscular atrophy |
| G12.2 | Motor neuron disease |
| G12.20 | Motor neuron disease, unspecified |
| G12.21 | Amyotrophic lateral sclerosis |
| G12.22 | Progressive bulbar palsy |
| G12.29 | Other motor neuron disease |
| G12.8 | Other spinal muscular atrophies and related syndromes |
| G12.9 | Spinal muscular atrophy, unspecified |
| G13 | Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere |
| G13.0 | Paraneoplastic neuromyopathy and neuropathy |
| G13.1 | Other systemic atrophy primarily affecting central nervous system in neoplastic disease |
| G13.2 | Systemic atrophy primarily affecting the central nervous system in myxedema |
| G13.8 | Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere |
| G14 | Postpolio syndrome |
| G20 | Parkinson's disease |
| G21 | Secondary parkinsonism |
| G21.0 | Malignant neuroleptic syndrome |
| G21.1 | Other drug-induced secondary parkinsonism |
| G21.11 | Neuroleptic induced parkinsonism |
| G21.19 | Other drug induced secondary parkinsonism |
| G21.2 | Secondary parkinsonism due to other external agents |
| G21.3 | Postencephalitic parkinsonism |
| G21.4 | Vascular parkinsonism |
| G21.8 | Other secondary parkinsonism |
| G21.9 | Secondary parkinsonism, unspecified |
| G23 | Other degenerative diseases of basal ganglia |
| G23.0 | Hallervorden-Spatz disease |
| G23.1 | Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski] |
| G23.2 | Striatonigral degeneration |
| G23.8 | Other specified degenerative diseases of basal ganglia |
| G23.9 | Degenerative disease of basal ganglia, unspecified |
| G24 | Dystonia |
| G24.0 | Drug induced dystonia |
| G24.01 | Drug induced subacute dyskinesia |
| G24.02 | Drug induced acute dystonia |
| G24.09 | Other drug induced dystonia |
| G24.1 | Genetic torsion dystonia |
| G24.2 | Idiopathic nonfamilial dystonia |
| G24.3 | Spasmodic torticollis |
| G24.4 | Idiopathic orofacial dystonia |
| G24.5 | Blepharospasm |
| G24.8 | Other dystonia |
| G24.9 | Dystonia, unspecified |
| G25 | Other extrapyramidal and movement disorders |
| G25.0 | Essential tremor |
| G25.1 | Drug-induced tremor |
| G25.2 | Other specified forms of tremor |
| G25.3 | Myoclonus |
| G25.4 | Drug-induced chorea |
| G25.5 | Other chorea |
| G25.6 | Drug induced tics and other tics of organic origin |
| G25.61 | Drug induced tics |
| G25.69 | Other tics of organic origin |
| G25.7 | Other and unspecified drug induced movement disorders |
| G25.70 | Drug induced movement disorder, unspecified |
| G25.71 | Drug induced akathisia |
| G25.79 | Other drug induced movement disorders |
| G25.8 | Other specified extrapyramidal and movement disorders |
| G25.81 | Restless legs syndrome |
| G25.82 | Stiff-man syndrome |
| G25.83 | Benign shuddering attacks |
| G25.89 | Other specified extrapyramidal and movement disorders |
| G25.9 | Extrapyramidal and movement disorder, unspecified |
| G26 | Extrapyramidal and movement disorders in diseases classified elsewhere |
| G30 | Alzheimer's disease |
| G30.0 | Alzheimer's disease with early onset |
| G30.1 | Alzheimer's disease with late onset |
| G30.8 | Other Alzheimer's disease |
| G30.9 | Alzheimer's disease, unspecified |
| G31 | Other degenerative diseases of nervous system, not elsewhere classified |
| G31.0 | Frontotemporal dementia |
| G31.01 | Pick's disease |
| G31.09 | Other frontotemporal dementia |
| G31.1 | Senile degeneration of brain, not elsewhere classified |
| G31.2 | Degeneration of nervous system due to alcohol |
| G31.8 | Other specified degenerative diseases of nervous system |
| G31.81 | Alpers disease |
| G31.82 | Leigh's disease |
| G31.83 | Dementia with Lewy bodies |
| G31.84 | Mild cognitive impairment, so stated |
| G31.85 | Corticobasal degeneration |
| G31.89 | Other specified degenerative diseases of nervous system |
| G31.9 | Degenerative disease of nervous system, unspecified |
| G32 | Other degenerative disorders of nervous system in diseases classified elsewhere |
| G32.0 | Subacute combined degeneration of spinal cord in diseases classified elsewhere |
| G32.8 | Other specified degenerative disorders of nervous system in diseases classified elsewhere |
| G32.81 | Cerebellar ataxia in diseases classified elsewhere |
| G32.89 | Other specified degenerative disorders of nervous system in diseases classified elsewhere |
| G35 | Multiple sclerosis |
| G36 | Other acute disseminated demyelination |
| G36.0 | Neuromyelitis optica [Devic] |
| G36.1 | Acute and subacute hemorrhagic leukoencephalitis [Hurst] |
| G36.8 | Other specified acute disseminated demyelination |
| G36.9 | Acute disseminated demyelination, unspecified |
| G37 | Other demyelinating diseases of central nervous system |
| G37.0 | Diffuse sclerosis of central nervous system |
| G37.1 | Central demyelination of corpus callosum |
| G37.2 | Central pontine myelinolysis |
| G37.3 | Acute transverse myelitis in demyelinating disease of central nervous system |
| G37.4 | Subacute necrotizing myelitis of central nervous system |
| G37.5 | Concentric sclerosis [Balo] of central nervous system |
| G37.8 | Other specified demyelinating diseases of central nervous system |
| G37.9 | Demyelinating disease of central nervous system, unspecified |
| G40 | Epilepsy and recurrent seizures |
| G40.0 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset |
| G40.00 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable |
| G40.001 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus |
| G40.009 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus |
| G40.01 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable |
| G40.011 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus |
| G40.019 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus |
| G40.1 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures |
| G40.10 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable |
| G40.101 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with status epilepticus |
| G40.109 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus |
| G40.11 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable |
| G40.111 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, with status epilepticus |
| G40.119 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, without status epilepticus |
| G40.2 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures |
| G40.20 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable |
| G40.201 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, with status epilepticus |
| G40.209 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus |
| G40.21 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable |
| G40.211 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, with status epilepticus |
| G40.219 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus |
| G40.3 | Generalized idiopathic epilepsy and epileptic syndromes |
| G40.30 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable |
| G40.301 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus |
| G40.309 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus |
| G40.31 | Generalized idiopathic epilepsy and epileptic syndromes, intractable |
| G40.311 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus |
| G40.319 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus |
| G40.A | Absence epileptic syndrome |
| G40.A0 | Absence epileptic syndrome, not intractable |
| G40.A01 | Absence epileptic syndrome, not intractable, with status epilepticus |
| G40.A09 | Absence epileptic syndrome, not intractable, without status epilepticus |
| G40.A1 | Absence epileptic syndrome, intractable |
| G40.A11 | Absence epileptic syndrome, intractable, with status epilepticus |
| G40.A19 | Absence epileptic syndrome, intractable, without status epilepticus |
| G40.B | Juvenile myoclonic epilepsy [impulsive petit mal] |
| G40.B0 | Juvenile myoclonic epilepsy, not intractable |
| G40.B01 | Juvenile myoclonic epilepsy, not intractable, with status epilepticus |
| G40.B09 | Juvenile myoclonic epilepsy, not intractable, without status epilepticus |
| G40.B1 | Juvenile myoclonic epilepsy, intractable |
| G40.B11 | Juvenile myoclonic epilepsy, intractable, with status epilepticus |
| G40.B19 | Juvenile myoclonic epilepsy, intractable, without status epilepticus |
| G40.4 | Other generalized epilepsy and epileptic syndromes |
| G40.40 | Other generalized epilepsy and epileptic syndromes, not intractable |
| G40.401 | Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus |
| G40.409 | Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus |
| G40.41 | Other generalized epilepsy and epileptic syndromes, intractable |
| G40.411 | Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus |
| G40.419 | Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus |
| G40.5 | Epileptic seizures related to external causes |
| G40.50 | Epileptic seizures related to external causes, not intractable |
| G40.501 | Epileptic seizures related to external causes, not intractable, with status epilepticus |
| G40.509 | Epileptic seizures related to external causes, not intractable, without status epilepticus |
| G40.8 | Other epilepsy and recurrent seizures |
| G40.80 | Other epilepsy |
| G40.801 | Other epilepsy, not intractable, with status epilepticus |
| G40.802 | Other epilepsy, not intractable, without status epilepticus |
| G40.803 | Other epilepsy, intractable, with status epilepticus |
| G40.804 | Other epilepsy, intractable, without status epilepticus |
| G40.81 | Lennox-Gastaut syndrome |
| G40.811 | Lennox-Gastaut syndrome, not intractable, with status epilepticus |
| G40.812 | Lennox-Gastaut syndrome, not intractable, without status epilepticus |
| G40.813 | Lennox-Gastaut syndrome, intractable, with status epilepticus |
| G40.814 | Lennox-Gastaut syndrome, intractable, without status epilepticus |
| G40.82 | Epileptic spasms |
| G40.821 | Epileptic spasms, not intractable, with status epilepticus |
| G40.822 | Epileptic spasms, not intractable, without status epilepticus |
| G40.823 | Epileptic spasms, intractable, with status epilepticus |
| G40.824 | Epileptic spasms, intractable, without status epilepticus |
| G40.89 | Other seizures |
| G40.9 | Epilepsy, unspecified |
| G40.90 | Epilepsy, unspecified, not intractable |
| G40.901 | Epilepsy, unspecified, not intractable, with status epilepticus |
| G40.909 | Epilepsy, unspecified, not intractable, without status epilepticus |
| G40.91 | Epilepsy, unspecified, intractable |
| G40.911 | Epilepsy, unspecified, intractable, with status epilepticus |
| G40.919 | Epilepsy, unspecified, intractable, without status epilepticus |
| G43 | Migraine |
| G43.0 | Migraine without aura |
| G43.00 | Migraine without aura, not intractable |
| G43.001 | Migraine without aura, not intractable, with status migrainosus |
| G43.009 | Migraine without aura, not intractable, without status migrainosus |
| G43.01 | Migraine without aura, intractable |
| G43.011 | Migraine without aura, intractable, with status migrainosus |
| G43.019 | Migraine without aura, intractable, without status migrainosus |
| G43.1 | Migraine with aura |
| G43.10 | Migraine with aura, not intractable |
| G43.101 | Migraine with aura, not intractable, with status migrainosus |
| G43.109 | Migraine with aura, not intractable, without status migrainosus |
| G43.11 | Migraine with aura, intractable |
| G43.111 | Migraine with aura, intractable, with status migrainosus |
| G43.119 | Migraine with aura, intractable, without status migrainosus |
| G43.4 | Hemiplegic migraine |
| G43.40 | Hemiplegic migraine, not intractable |
| G43.401 | Hemiplegic migraine, not intractable, with status migrainosus |
| G43.409 | Hemiplegic migraine, not intractable, without status migrainosus |
| G43.41 | Hemiplegic migraine, intractable |
| G43.411 | Hemiplegic migraine, intractable, with status migrainosus |
| G43.419 | Hemiplegic migraine, intractable, without status migrainosus |
| G43.5 | Persistent migraine aura without cerebral infarction |
| G43.50 | Persistent migraine aura without cerebral infarction, not intractable |
| G43.501 | Persistent migraine aura without cerebral infarction, not intractable, with status migrainosus |
| G43.509 | Persistent migraine aura without cerebral infarction, not intractable, without status migrainosus |
| G43.51 | Persistent migraine aura without cerebral infarction, intractable |
| G43.511 | Persistent migraine aura without cerebral infarction, intractable, with status migrainosus |
| G43.519 | Persistent migraine aura without cerebral infarction, intractable, without status migrainosus |
| G43.6 | Persistent migraine aura with cerebral infarction |
| G43.60 | Persistent migraine aura with cerebral infarction, not intractable |
| G43.601 | Persistent migraine aura with cerebral infarction, not intractable, with status migrainosus |
| G43.609 | Persistent migraine aura with cerebral infarction, not intractable, without status migrainosus |
| G43.61 | Persistent migraine aura with cerebral infarction, intractable |
| G43.611 | Persistent migraine aura with cerebral infarction, intractable, with status migrainosus |
| G43.619 | Persistent migraine aura with cerebral infarction, intractable, without status migrainosus |
| G43.7 | Chronic migraine without aura |
| G43.70 | Chronic migraine without aura, not intractable |
| G43.701 | Chronic migraine without aura, not intractable, with status migrainosus |
| G43.709 | Chronic migraine without aura, not intractable, without status migrainosus |
| G43.71 | Chronic migraine without aura, intractable |
| G43.711 | Chronic migraine without aura, intractable, with status migrainosus |
| G43.719 | Chronic migraine without aura, intractable, without status migrainosus |
| G43.A | Cyclical vomiting |
| G43.A0 | Cyclical vomiting, not intractable |
| G43.A1 | Cyclical vomiting, intractable |
| G43.B | Ophthalmoplegic migraine |
| G43.B0 | Ophthalmoplegic migraine, not intractable |
| G43.B1 | Ophthalmoplegic migraine, intractable |
| G43.C | Periodic headache syndromes in child or adult |
| G43.C0 | Periodic headache syndromes in child or adult, not intractable |
| G43.C1 | Periodic headache syndromes in child or adult, intractable |
| G43.D | Abdominal migraine |
| G43.D0 | Abdominal migraine, not intractable |
| G43.D1 | Abdominal migraine, intractable |
| G43.8 | Other migraine |
| G43.80 | Other migraine, not intractable |
| G43.801 | Other migraine, not intractable, with status migrainosus |
| G43.809 | Other migraine, not intractable, without status migrainosus |
| G43.81 | Other migraine, intractable |
| G43.811 | Other migraine, intractable, with status migrainosus |
| G43.819 | Other migraine, intractable, without status migrainosus |
| G43.82 | Menstrual migraine, not intractable |
| G43.821 | Menstrual migraine, not intractable, with status migrainosus |
| G43.829 | Menstrual migraine, not intractable, without status migrainosus |
| G43.83 | Menstrual migraine, intractable |
| G43.831 | Menstrual migraine, intractable, with status migrainosus |
| G43.839 | Menstrual migraine, intractable, without status migrainosus |
| G43.9 | Migraine, unspecified |
| G43.90 | Migraine, unspecified, not intractable |
| G43.901 | Migraine, unspecified, not intractable, with status migrainosus |
| G43.909 | Migraine, unspecified, not intractable, without status migrainosus |
| G43.91 | Migraine, unspecified, intractable |
| G43.911 | Migraine, unspecified, intractable, with status migrainosus |
| G43.919 | Migraine, unspecified, intractable, without status migrainosus |
| G44 | Other headache syndromes |
| G44.0 | Cluster headaches and other trigeminal autonomic cephalgias (TAC) |
| G44.00 | Cluster headache syndrome, unspecified |
| G44.001 | Cluster headache syndrome, unspecified, intractable |
| G44.009 | Cluster headache syndrome, unspecified, not intractable |
| G44.01 | Episodic cluster headache |
| G44.011 | Episodic cluster headache, intractable |
| G44.019 | Episodic cluster headache, not intractable |
| G44.02 | Chronic cluster headache |
| G44.021 | Chronic cluster headache, intractable |
| G44.029 | Chronic cluster headache, not intractable |
| G44.03 | Episodic paroxysmal hemicrania |
| G44.031 | Episodic paroxysmal hemicrania, intractable |
| G44.039 | Episodic paroxysmal hemicrania, not intractable |
| G44.04 | Chronic paroxysmal hemicrania |
| G44.041 | Chronic paroxysmal hemicrania, intractable |
| G44.049 | Chronic paroxysmal hemicrania, not intractable |
| G44.05 | Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) |
| G44.051 | Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable |
| G44.059 | Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable |
| G44.09 | Other trigeminal autonomic cephalgias (TAC) |
| G44.091 | Other trigeminal autonomic cephalgias (TAC), intractable |
| G44.099 | Other trigeminal autonomic cephalgias (TAC), not intractable |
| G44.1 | Vascular headache, not elsewhere classified |
| G44.2 | Tension-type headache |
| G44.20 | Tension-type headache, unspecified |
| G44.201 | Tension-type headache, unspecified, intractable |
| G44.209 | Tension-type headache, unspecified, not intractable |
| G44.21 | Episodic tension-type headache |
| G44.211 | Episodic tension-type headache, intractable |
| G44.219 | Episodic tension-type headache, not intractable |
| G44.22 | Chronic tension-type headache |
| G44.221 | Chronic tension-type headache, intractable |
| G44.229 | Chronic tension-type headache, not intractable |
| G44.3 | Post-traumatic headache |
| G44.30 | Post-traumatic headache, unspecified |
| G44.301 | Post-traumatic headache, unspecified, intractable |
| G44.309 | Post-traumatic headache, unspecified, not intractable |
| G44.31 | Acute post-traumatic headache |
| G44.311 | Acute post-traumatic headache, intractable |
| G44.319 | Acute post-traumatic headache, not intractable |
| G44.32 | Chronic post-traumatic headache |
| G44.321 | Chronic post-traumatic headache, intractable |
| G44.329 | Chronic post-traumatic headache, not intractable |
| G44.4 | Drug-induced headache, not elsewhere classified |
| G44.40 | Drug-induced headache, not elsewhere classified, not intractable |
| G44.41 | Drug-induced headache, not elsewhere classified, intractable |
| G44.5 | Complicated headache syndromes |
| G44.51 | Hemicrania continua |
| G44.52 | New daily persistent headache (NDPH) |
| G44.53 | Primary thunderclap headache |
| G44.59 | Other complicated headache syndrome |
| G44.8 | Other specified headache syndromes |
| G44.81 | Hypnic headache |
| G44.82 | Headache associated with sexual activity |
| G44.83 | Primary cough headache |
| G44.84 | Primary exertional headache |
| G44.85 | Primary stabbing headache |
| G44.89 | Other headache syndrome |
| G45 | Transient cerebral ischemic attacks and related syndromes |
| G45.0 | Vertebro-basilar artery syndrome |
| G45.1 | Carotid artery syndrome (hemispheric) |
| G45.2 | Multiple and bilateral precerebral artery syndromes |
| G45.3 | Amaurosis fugax |
| G45.4 | Transient global amnesia |
| G45.8 | Other transient cerebral ischemic attacks and related syndromes |
| G45.9 | Transient cerebral ischemic attack, unspecified |
| G46 | Vascular syndromes of brain in cerebrovascular diseases |
| G46.0 | Middle cerebral artery syndrome |
| G46.1 | Anterior cerebral artery syndrome |
| G46.2 | Posterior cerebral artery syndrome |
| G46.3 | Brain stem stroke syndrome |
| G46.4 | Cerebellar stroke syndrome |
| G46.5 | Pure motor lacunar syndrome |
| G46.6 | Pure sensory lacunar syndrome |
| G46.7 | Other lacunar syndromes |
| G46.8 | Other vascular syndromes of brain in cerebrovascular diseases |
| G47 | Sleep disorders |
| G47.0 | Insomnia |
| G47.00 | Insomnia, unspecified |
| G47.01 | Insomnia due to medical condition |
| G47.09 | Other insomnia |
| G47.1 | Hypersomnia |
| G47.10 | Hypersomnia, unspecified |
| G47.11 | Idiopathic hypersomnia with long sleep time |
| G47.12 | Idiopathic hypersomnia without long sleep time |
| G47.13 | Recurrent hypersomnia |
| G47.14 | Hypersomnia due to medical condition |
| G47.19 | Other hypersomnia |
| G47.2 | Circadian rhythm sleep disorders |
| G47.20 | Circadian rhythm sleep disorder, unspecified type |
| G47.21 | Circadian rhythm sleep disorder, delayed sleep phase type |
| G47.22 | Circadian rhythm sleep disorder, advanced sleep phase type |
| G47.23 | Circadian rhythm sleep disorder, irregular sleep wake type |
| G47.24 | Circadian rhythm sleep disorder, free running type |
| G47.25 | Circadian rhythm sleep disorder, jet lag type |
| G47.26 | Circadian rhythm sleep disorder, shift work type |
| G47.27 | Circadian rhythm sleep disorder in conditions classified elsewhere |
| G47.29 | Other circadian rhythm sleep disorder |
| G47.3 | Sleep apnea |
| G47.30 | Sleep apnea, unspecified |
| G47.31 | Primary central sleep apnea |
| G47.32 | High altitude periodic breathing |
| G47.33 | Obstructive sleep apnea (adult) (pediatric) |
| G47.34 | Idiopathic sleep related nonobstructive alveolar hypoventilation |
| G47.35 | Congenital central alveolar hypoventilation syndrome |
| G47.36 | Sleep related hypoventilation in conditions classified elsewhere |
| G47.37 | Central sleep apnea in conditions classified elsewhere |
| G47.39 | Other sleep apnea |
| G47.4 | Narcolepsy and cataplexy |
| G47.41 | Narcolepsy |
| G47.411 | Narcolepsy with cataplexy |
| G47.419 | Narcolepsy without cataplexy |
| G47.42 | Narcolepsy in conditions classified elsewhere |
| G47.421 | Narcolepsy in conditions classified elsewhere with cataplexy |
| G47.429 | Narcolepsy in conditions classified elsewhere without cataplexy |
| G47.5 | Parasomnia |
| G47.50 | Parasomnia, unspecified |
| G47.51 | Confusional arousals |
| G47.52 | REM sleep behavior disorder |
| G47.53 | Recurrent isolated sleep paralysis |
| G47.54 | Parasomnia in conditions classified elsewhere |
| G47.59 | Other parasomnia |
| G47.6 | Sleep related movement disorders |
| G47.61 | Periodic limb movement disorder |
| G47.62 | Sleep related leg cramps |
| G47.63 | Sleep related bruxism |
| G47.69 | Other sleep related movement disorders |
| G47.8 | Other sleep disorders |
| G47.9 | Sleep disorder, unspecified |
| G50 | Disorders of trigeminal nerve |
| G50.0 | Trigeminal neuralgia |
| G50.1 | Atypical facial pain |
| G50.8 | Other disorders of trigeminal nerve |
| G50.9 | Disorder of trigeminal nerve, unspecified |
| G51 | Facial nerve disorders |
| G51.0 | Bell's palsy |
| G51.1 | Geniculate ganglionitis |
| G51.2 | Melkersson's syndrome |
| G51.3 | Clonic hemifacial spasm |
| G51.4 | Facial myokymia |
| G51.8 | Other disorders of facial nerve |
| G51.9 | Disorder of facial nerve, unspecified |
| G52 | Disorders of other cranial nerves |
| G52.0 | Disorders of olfactory nerve |
| G52.1 | Disorders of glossopharyngeal nerve |
| G52.2 | Disorders of vagus nerve |
| G52.3 | Disorders of hypoglossal nerve |
| G52.7 | Disorders of multiple cranial nerves |
| G52.8 | Disorders of other specified cranial nerves |
| G52.9 | Cranial nerve disorder, unspecified |
| G53 | Cranial nerve disorders in diseases classified elsewhere |
| G54 | Nerve root and plexus disorders |
| G54.0 | Brachial plexus disorders |
| G54.1 | Lumbosacral plexus disorders |
| G54.2 | Cervical root disorders, not elsewhere classified |
| G54.3 | Thoracic root disorders, not elsewhere classified |
| G54.4 | Lumbosacral root disorders, not elsewhere classified |
| G54.5 | Neuralgic amyotrophy |
| G54.6 | Phantom limb syndrome with pain |
| G54.7 | Phantom limb syndrome without pain |
| G54.8 | Other nerve root and plexus disorders |
| G54.9 | Nerve root and plexus disorder, unspecified |
| G55 | Nerve root and plexus compressions in diseases classified elsewhere |
| G56 | Mononeuropathies of upper limb |
| G56.0 | Carpal tunnel syndrome |
| G56.00 | Carpal tunnel syndrome, unspecified upper limb |
| G56.01 | Carpal tunnel syndrome, right upper limb |
| G56.02 | Carpal tunnel syndrome, left upper limb |
| G56.1 | Other lesions of median nerve |
| G56.10 | Other lesions of median nerve, unspecified upper limb |
| G56.11 | Other lesions of median nerve, right upper limb |
| G56.12 | Other lesions of median nerve, left upper limb |
| G56.2 | Lesion of ulnar nerve |
| G56.20 | Lesion of ulnar nerve, unspecified upper limb |
| G56.21 | Lesion of ulnar nerve, right upper limb |
| G56.22 | Lesion of ulnar nerve, left upper limb |
| G56.3 | Lesion of radial nerve |
| G56.30 | Lesion of radial nerve, unspecified upper limb |
| G56.31 | Lesion of radial nerve, right upper limb |
| G56.32 | Lesion of radial nerve, left upper limb |
| G56.4 | Causalgia of upper limb |
| G56.40 | Causalgia of unspecified upper limb |
| G56.41 | Causalgia of right upper limb |
| G56.42 | Causalgia of left upper limb |
| G56.8 | Other specified mononeuropathies of upper limb |
| G56.80 | Other specified mononeuropathies of unspecified upper limb |
| G56.81 | Other specified mononeuropathies of right upper limb |
| G56.82 | Other specified mononeuropathies of left upper limb |
| G56.9 | Unspecified mononeuropathy of upper limb |
| G56.90 | Unspecified mononeuropathy of unspecified upper limb |
| G56.91 | Unspecified mononeuropathy of right upper limb |
| G56.92 | Unspecified mononeuropathy of left upper limb |
| G57 | Mononeuropathies of lower limb |
| G57.0 | Lesion of sciatic nerve |
| G57.00 | Lesion of sciatic nerve, unspecified lower limb |
| G57.01 | Lesion of sciatic nerve, right lower limb |
| G57.02 | Lesion of sciatic nerve, left lower limb |
| G57.1 | Meralgia paresthetica |
| G57.10 | Meralgia paresthetica, unspecified lower limb |
| G57.11 | Meralgia paresthetica, right lower limb |
| G57.12 | Meralgia paresthetica, left lower limb |
| G57.2 | Lesion of femoral nerve |
| G57.20 | Lesion of femoral nerve, unspecified lower limb |
| G57.21 | Lesion of femoral nerve, right lower limb |
| G57.22 | Lesion of femoral nerve, left lower limb |
| G57.3 | Lesion of lateral popliteal nerve |
| G57.30 | Lesion of lateral popliteal nerve, unspecified lower limb |
| G57.31 | Lesion of lateral popliteal nerve, right lower limb |
| G57.32 | Lesion of lateral popliteal nerve, left lower limb |
| G57.4 | Lesion of medial popliteal nerve |
| G57.40 | Lesion of medial popliteal nerve, unspecified lower limb |
| G57.41 | Lesion of medial popliteal nerve, right lower limb |
| G57.42 | Lesion of medial popliteal nerve, left lower limb |
| G57.5 | Tarsal tunnel syndrome |
| G57.50 | Tarsal tunnel syndrome, unspecified lower limb |
| G57.51 | Tarsal tunnel syndrome, right lower limb |
| G57.52 | Tarsal tunnel syndrome, left lower limb |
| G57.6 | Lesion of plantar nerve |
| G57.60 | Lesion of plantar nerve, unspecified lower limb |
| G57.61 | Lesion of plantar nerve, right lower limb |
| G57.62 | Lesion of plantar nerve, left lower limb |
| G57.7 | Causalgia of lower limb |
| G57.70 | Causalgia of unspecified lower limb |
| G57.71 | Causalgia of right lower limb |
| G57.72 | Causalgia of left lower limb |
| G57.8 | Other specified mononeuropathies of lower limb |
| G57.80 | Other specified mononeuropathies of unspecified lower limb |
| G57.81 | Other specified mononeuropathies of right lower limb |
| G57.82 | Other specified mononeuropathies of left lower limb |
| G57.9 | Unspecified mononeuropathy of lower limb |
| G57.90 | Unspecified mononeuropathy of unspecified lower limb |
| G57.91 | Unspecified mononeuropathy of right lower limb |
| G57.92 | Unspecified mononeuropathy of left lower limb |
| G58 | Other mononeuropathies |
| G58.0 | Intercostal neuropathy |
| G58.7 | Mononeuritis multiplex |
| G58.8 | Other specified mononeuropathies |
| G58.9 | Mononeuropathy, unspecified |
| G59 | Mononeuropathy in diseases classified elsewhere |
| G60 | Hereditary and idiopathic neuropathy |
| G60.0 | Hereditary motor and sensory neuropathy |
| G60.1 | Refsum's disease |
| G60.2 | Neuropathy in association with hereditary ataxia |
| G60.3 | Idiopathic progressive neuropathy |
| G60.8 | Other hereditary and idiopathic neuropathies |
| G60.9 | Hereditary and idiopathic neuropathy, unspecified |
| G61 | Inflammatory polyneuropathy |
| G61.0 | Guillain-Barre syndrome |
| G61.1 | Serum neuropathy |
| G61.8 | Other inflammatory polyneuropathies |
| G61.81 | Chronic inflammatory demyelinating polyneuritis |
| G61.89 | Other inflammatory polyneuropathies |
| G61.9 | Inflammatory polyneuropathy, unspecified |
| G62 | Other and unspecified polyneuropathies |
| G62.0 | Drug-induced polyneuropathy |
| G62.1 | Alcoholic polyneuropathy |
| G62.2 | Polyneuropathy due to other toxic agents |
| G62.8 | Other specified polyneuropathies |
| G62.81 | Critical illness polyneuropathy |
| G62.82 | Radiation-induced polyneuropathy |
| G62.89 | Other specified polyneuropathies |
| G62.9 | Polyneuropathy, unspecified |
| G63 | Polyneuropathy in diseases classified elsewhere |
| G64 | Other disorders of peripheral nervous system |
| G65 | Sequelae of inflammatory and toxic polyneuropathies |
| G65.0 | Sequelae of Guillain-Barré syndrome |
| G65.1 | Sequelae of other inflammatory polyneuropathy |
| G65.2 | Sequelae of toxic polyneuropathy |
| G70 | Myasthenia gravis and other myoneural disorders |
| G70.0 | Myasthenia gravis |
| G70.00 | Myasthenia gravis without (acute) exacerbation |
| G70.01 | Myasthenia gravis with (acute) exacerbation |
| G70.1 | Toxic myoneural disorders |
| G70.2 | Congenital and developmental myasthenia |
| G70.8 | Other specified myoneural disorders |
| G70.80 | Lambert-Eaton syndrome, unspecified |
| G70.81 | Lambert-Eaton syndrome in disease classified elsewhere |
| G70.89 | Other specified myoneural disorders |
| G70.9 | Myoneural disorder, unspecified |
| G71 | Primary disorders of muscles |
| G71.0 | Muscular dystrophy |
| G71.1 | Myotonic disorders |
| G71.11 | Myotonic muscular dystrophy |
| G71.12 | Myotonia congenita |
| G71.13 | Myotonic chondrodystrophy |
| G71.14 | Drug induced myotonia |
| G71.19 | Other specified myotonic disorders |
| G71.2 | Congenital myopathies |
| G71.3 | Mitochondrial myopathy, not elsewhere classified |
| G71.8 | Other primary disorders of muscles |
| G71.9 | Primary disorder of muscle, unspecified |
| G72 | Other and unspecified myopathies |
| G72.0 | Drug-induced myopathy |
| G72.1 | Alcoholic myopathy |
| G72.2 | Myopathy due to other toxic agents |
| G72.3 | Periodic paralysis |
| G72.4 | Inflammatory and immune myopathies, not elsewhere classified |
| G72.41 | Inclusion body myositis [IBM] |
| G72.49 | Other inflammatory and immune myopathies, not elsewhere classified |
| G72.8 | Other specified myopathies |
| G72.81 | Critical illness myopathy |
| G72.89 | Other specified myopathies |
| G72.9 | Myopathy, unspecified |
| G73 | Disorders of myoneural junction and muscle in diseases classified elsewhere |
| G73.1 | Lambert-Eaton syndrome in neoplastic disease |
| G73.3 | Myasthenic syndromes in other diseases classified elsewhere |
| G73.7 | Myopathy in diseases classified elsewhere |
| G80 | Cerebral palsy |
| G80.0 | Spastic quadriplegic cerebral palsy |
| G80.1 | Spastic diplegic cerebral palsy |
| G80.2 | Spastic hemiplegic cerebral palsy |
| G80.3 | Athetoid cerebral palsy |
| G80.4 | Ataxic cerebral palsy |
| G80.8 | Other cerebral palsy |
| G80.9 | Cerebral palsy, unspecified |
| G81 | Hemiplegia and hemiparesis |
| G81.0 | Flaccid hemiplegia |
| G81.00 | Flaccid hemiplegia affecting unspecified side |
| G81.01 | Flaccid hemiplegia affecting right dominant side |
| G81.02 | Flaccid hemiplegia affecting left dominant side |
| G81.03 | Flaccid hemiplegia affecting right nondominant side |
| G81.04 | Flaccid hemiplegia affecting left nondominant side |
| G81.1 | Spastic hemiplegia |
| G81.10 | Spastic hemiplegia affecting unspecified side |
| G81.11 | Spastic hemiplegia affecting right dominant side |
| G81.12 | Spastic hemiplegia affecting left dominant side |
| G81.13 | Spastic hemiplegia affecting right nondominant side |
| G81.14 | Spastic hemiplegia affecting left nondominant side |
| G81.9 | Hemiplegia, unspecified |
| G81.90 | Hemiplegia, unspecified affecting unspecified side |
| G81.91 | Hemiplegia, unspecified affecting right dominant side |
| G81.92 | Hemiplegia, unspecified affecting left dominant side |
| G81.93 | Hemiplegia, unspecified affecting right nondominant side |
| G81.94 | Hemiplegia, unspecified affecting left nondominant side |
| G82 | Paraplegia (paraparesis) and quadriplegia (quadriparesis) |
| G82.2 | Paraplegia |
| G82.20 | Paraplegia, unspecified |
| G82.21 | Paraplegia, complete |
| G82.22 | Paraplegia, incomplete |
| G82.5 | Quadriplegia |
| G82.50 | Quadriplegia, unspecified |
| G82.51 | Quadriplegia, C1-C4 complete |
| G82.52 | Quadriplegia, C1-C4 incomplete |
| G82.53 | Quadriplegia, C5-C7 complete |
| G82.54 | Quadriplegia, C5-C7 incomplete |
| G83 | Other paralytic syndromes |
| G83.0 | Diplegia of upper limbs |
| G83.1 | Monoplegia of lower limb |
| G83.10 | Monoplegia of lower limb affecting unspecified side |
| G83.11 | Monoplegia of lower limb affecting right dominant side |
| G83.12 | Monoplegia of lower limb affecting left dominant side |
| G83.13 | Monoplegia of lower limb affecting right nondominant side |
| G83.14 | Monoplegia of lower limb affecting left nondominant side |
| G83.2 | Monoplegia of upper limb |
| G83.20 | Monoplegia of upper limb affecting unspecified side |
| G83.21 | Monoplegia of upper limb affecting right dominant side |
| G83.22 | Monoplegia of upper limb affecting left dominant side |
| G83.23 | Monoplegia of upper limb affecting right nondominant side |
| G83.24 | Monoplegia of upper limb affecting left nondominant side |
| G83.3 | Monoplegia, unspecified |
| G83.30 | Monoplegia, unspecified affecting unspecified side |
| G83.31 | Monoplegia, unspecified affecting right dominant side |
| G83.32 | Monoplegia, unspecified affecting left dominant side |
| G83.33 | Monoplegia, unspecified affecting right nondominant side |
| G83.34 | Monoplegia, unspecified affecting left nondominant side |
| G83.4 | Cauda equina syndrome |
| G83.5 | Locked-in state |
| G83.8 | Other specified paralytic syndromes |
| G83.81 | Brown-Séquard syndrome |
| G83.82 | Anterior cord syndrome |
| G83.83 | Posterior cord syndrome |
| G83.84 | Todd's paralysis (postepileptic) |
| G83.89 | Other specified paralytic syndromes |
| G83.9 | Paralytic syndrome, unspecified |
| G89 | Pain, not elsewhere classified |
| G89.0 | Central pain syndrome |
| G89.1 | Acute pain, not elsewhere classified |
| G89.11 | Acute pain due to trauma |
| G89.12 | Acute post-thoracotomy pain |
| G89.18 | Other acute postprocedural pain |
| G89.2 | Chronic pain, not elsewhere classified |
| G89.21 | Chronic pain due to trauma |
| G89.22 | Chronic post-thoracotomy pain |
| G89.28 | Other chronic postprocedural pain |
| G89.29 | Other chronic pain |
| G89.3 | Neoplasm related pain (acute) (chronic) |
| G89.4 | Chronic pain syndrome |
| G90 | Disorders of autonomic nervous system |
| G90.0 | Idiopathic peripheral autonomic neuropathy |
| G90.01 | Carotid sinus syncope |
| G90.09 | Other idiopathic peripheral autonomic neuropathy |
| G90.1 | Familial dysautonomia [Riley-Day] |
| G90.2 | Horner's syndrome |
| G90.3 | Multi-system degeneration of the autonomic nervous system |
| G90.4 | Autonomic dysreflexia |
| G90.5 | Complex regional pain syndrome I (CRPS I) |
| G90.50 | Complex regional pain syndrome I, unspecified |
| G90.51 | Complex regional pain syndrome I of upper limb |
| G90.511 | Complex regional pain syndrome I of right upper limb |
| G90.512 | Complex regional pain syndrome I of left upper limb |
| G90.513 | Complex regional pain syndrome I of upper limb, bilateral |
| G90.519 | Complex regional pain syndrome I of unspecified upper limb |
| G90.52 | Complex regional pain syndrome I of lower limb |
| G90.521 | Complex regional pain syndrome I of right lower limb |
| G90.522 | Complex regional pain syndrome I of left lower limb |
| G90.523 | Complex regional pain syndrome I of lower limb, bilateral |
| G90.529 | Complex regional pain syndrome I of unspecified lower limb |
| G90.59 | Complex regional pain syndrome I of other specified site |
| G90.8 | Other disorders of autonomic nervous system |
| G90.9 | Disorder of the autonomic nervous system, unspecified |
| G91 | Hydrocephalus |
| G91.0 | Communicating hydrocephalus |
| G91.1 | Obstructive hydrocephalus |
| G91.2 | (Idiopathic) normal pressure hydrocephalus |
| G91.3 | Post-traumatic hydrocephalus, unspecified |
| G91.4 | Hydrocephalus in diseases classified elsewhere |
| G91.8 | Other hydrocephalus |
| G91.9 | Hydrocephalus, unspecified |
| G92 | Toxic encephalopathy |
| G93 | Other disorders of brain |
| G93.0 | Cerebral cysts |
| G93.1 | Anoxic brain damage, not elsewhere classified |
| G93.2 | Benign intracranial hypertension |
| G93.3 | Postviral fatigue syndrome |
| G93.4 | Other and unspecified encephalopathy |
| G93.40 | Encephalopathy, unspecified |
| G93.41 | Metabolic encephalopathy |
| G93.49 | Other encephalopathy |
| G93.5 | Compression of brain |
| G93.6 | Cerebral edema |
| G93.7 | Reye's syndrome |
| G93.8 | Other specified disorders of brain |
| G93.81 | Temporal sclerosis |
| G93.82 | Brain death |
| G93.89 | Other specified disorders of brain |
| G93.9 | Disorder of brain, unspecified |
| G94 | Other disorders of brain in diseases classified elsewhere |
| G95 | Other and unspecified diseases of spinal cord |
| G95.0 | Syringomyelia and syringobulbia |
| G95.1 | Vascular myelopathies |
| G95.11 | Acute infarction of spinal cord (embolic) (nonembolic) |
| G95.19 | Other vascular myelopathies |
| G95.2 | Other and unspecified cord compression |
| G95.20 | Unspecified cord compression |
| G95.29 | Other cord compression |
| G95.8 | Other specified diseases of spinal cord |
| G95.81 | Conus medullaris syndrome |
| G95.89 | Other specified diseases of spinal cord |
| G95.9 | Disease of spinal cord, unspecified |
| G96 | Other disorders of central nervous system |
| G96.0 | Cerebrospinal fluid leak |
| G96.1 | Disorders of meninges, not elsewhere classified |
| G96.11 | Dural tear |
| G96.12 | Meningeal adhesions (cerebral) (spinal) |
| G96.19 | Other disorders of meninges, not elsewhere classified |
| G96.8 | Other specified disorders of central nervous system |
| G96.9 | Disorder of central nervous system, unspecified |
| G97 | Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified |
| G97.0 | Cerebrospinal fluid leak from spinal puncture |
| G97.1 | Other reaction to spinal and lumbar puncture |
| G97.2 | Intracranial hypotension following ventricular shunting |
| G97.3 | Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a procedure |
| G97.31 | Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a nervous system procedure |
| G97.32 | Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating other procedure |
| G97.4 | Accidental puncture and laceration of a nervous system organ or structure during a procedure |
| G97.41 | Accidental puncture or laceration of dura during a procedure |
| G97.48 | Accidental puncture and laceration of other nervous system organ or structure during a nervous system procedure |
| G97.49 | Accidental puncture and laceration of other nervous system organ or structure during other procedure |
| G97.5 | Postprocedural hemorrhage and hematoma of a nervous system organ or structure following a procedure |
| G97.51 | Postprocedural hemorrhage and hematoma of a nervous system organ or structure following a nervous system procedure |
| G97.52 | Postprocedural hemorrhage and hematoma of a nervous system organ or structure following other procedure |
| G97.8 | Other intraoperative and postprocedural complications and disorders of nervous system |
| G97.81 | Other intraoperative complications of nervous system |
| G97.82 | Other postprocedural complications and disorders of nervous system |
| G98 | Other disorders of nervous system not elsewhere classified |
| G98.0 | Neurogenic arthritis, not elsewhere classified |
| G98.8 | Other disorders of nervous system |
| G99 | Other disorders of nervous system in diseases classified elsewhere |
| G99.0 | Autonomic neuropathy in diseases classified elsewhere |
| G99.2 | Myelopathy in diseases classified elsewhere |
| G99.8 | Other specified disorders of nervous system in diseases classified elsewhere |