G00–G99
Diseases of the Nervous System
Parkinson's, epilepsy, migraine, neuropathy
G44.30
Post-traumatic headache, unspecified
Non-billable
G44.301
Post-traumatic headache, unspecified, intractable
Billable
G44.309
Post-traumatic headache, unspecified, not intractable
Billable
G44.31
Acute post-traumatic headache
Non-billable
G44.311
Acute post-traumatic headache, intractable
Billable
G44.319
Acute post-traumatic headache, not intractable
Billable
G44.32
Chronic post-traumatic headache
Non-billable
G44.321
Chronic post-traumatic headache, intractable
Billable
G44.329
Chronic post-traumatic headache, not intractable
Billable
G44.4
Drug-induced headache, not elsewhere classified
Non-billable
G44.40
Drug-induced headache, not elsewhere classified, not intractable
Billable
G44.41
Drug-induced headache, not elsewhere classified, intractable
Billable
G44.5
Complicated headache syndromes
Non-billable
G44.51
Hemicrania continua
Billable
G44.52
New daily persistent headache (NDPH)
Billable
G44.53
Primary thunderclap headache
Billable
G44.59
Other complicated headache syndrome
Billable
G44.8
Other specified headache syndromes
Non-billable
G44.81
Hypnic headache
Billable
G44.82
Headache associated with sexual activity
Billable
G44.83
Primary cough headache
Billable
G44.84
Primary exertional headache
Billable
G44.85
Primary stabbing headache
Billable
G44.86
Cervicogenic headache
Billable
G44.89
Other headache syndrome
Billable
G45
Transient cerebral ischemic attacks and related syndromes
Non-billable
G45.0
Vertebro-basilar artery syndrome
Billable
G45.1
Carotid artery syndrome (hemispheric)
Billable
G45.2
Multiple and bilateral precerebral artery syndromes
Billable
G45.3
Amaurosis fugax
Billable
G45.4
Transient global amnesia
Billable
G45.8
Other transient cerebral ischemic attacks and related syndromes
Billable
G45.9
Transient cerebral ischemic attack, unspecified
Billable
G46
Vascular syndromes of brain in cerebrovascular diseases
Non-billable
G46.0
Middle cerebral artery syndrome
Billable
G46.1
Anterior cerebral artery syndrome
Billable
G46.2
Posterior cerebral artery syndrome
Billable
G46.3
Brain stem stroke syndrome
Billable
G46.4
Cerebellar stroke syndrome
Billable
G46.5
Pure motor lacunar syndrome
Billable
G46.6
Pure sensory lacunar syndrome
Billable
G46.7
Other lacunar syndromes
Billable
G46.8
Other vascular syndromes of brain in cerebrovascular diseases
Billable
G47
Sleep disorders
Non-billable
G47.0
Insomnia
Non-billable
G47.00
Insomnia, unspecified
Billable
G47.01
Insomnia due to medical condition
Billable
G47.09
Other insomnia
Billable
G47.1
Hypersomnia
Non-billable
G47.10
Hypersomnia, unspecified
Billable
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