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Diseases of the nervous system (G00-G99)

Excludes 2:: certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Episodic and paroxysmal disorders (G40-G47)

G40

Epilepsy and recurrent seizures [+]

Note:

the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

Excludes 1:	conversion disorder with seizures (F44.5) convulsions NOS (R56.9) post traumatic seizures (R56.1) seizure (convulsive) NOS (R56.9) seizure of newborn (P90)
Excludes 2:	hippocampal sclerosis (G93.81) mesial temporal sclerosis (G93.81) temporal sclerosis (G93.81) Todd's paralysis (G83.84)

G40.0

Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset [+]
Benign childhood epilepsy with centrotemporal EEG spikes
Childhood epilepsy with occipital EEG paroxysms

Excludes 1:

adult onset localization-related epilepsy (G40.1-, G40.2-)

G40.1

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures [+]
Attacks without alteration of consciousness
Epilepsia partialis continua [Kozhevnikof]
Simple partial seizures developing into secondarily generalized seizures

G40.2

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures [+]
Attacks with alteration of consciousness, often with automatisms
Complex partial seizures developing into secondarily generalized seizures

G40.3

Generalized idiopathic epilepsy and epileptic syndromes [+]

Code also

MERRF syndrome, if applicable (E88.42)

G40.A

Absence epileptic syndrome [+]
Childhood absence epilepsy [pyknolepsy]
Juvenile absence epilepsy
Absence epileptic syndrome, NOS

G40.B

Juvenile myoclonic epilepsy [impulsive petit mal] [+]

G40.C

Lafora progressive myoclonus epilepsy [+]
Lafora body disease

Code also

, if applicable, associated conditions such as dementia (F02.8-)

G40.4

Other generalized epilepsy and epileptic syndromes [+]
Epilepsy with grand mal seizures on awakening
Epilepsy with myoclonic absences
Epilepsy with myoclonic-astatic seizures
Grand mal seizure NOS
Nonspecific atonic epileptic seizures
Nonspecific clonic epileptic seizures
Nonspecific myoclonic epileptic seizures
Nonspecific tonic epileptic seizures
Nonspecific tonic-clonic epileptic seizures
Symptomatic early myoclonic encephalopathy

G40.5

Epileptic seizures related to external causes [+]
Epileptic seizures related to alcohol
Epileptic seizures related to drugs
Epileptic seizures related to hormonal changes
Epileptic seizures related to sleep deprivation
Epileptic seizures related to stress

Code also	, if applicable, associated epilepsy and recurrent seizures (G40.-)
Use additional	code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

G40.8

Other epilepsy and recurrent seizures [+]
Epilepsies and epileptic syndromes undetermined as to whether they are focal or generalized
Landau-Kleffner syndrome

G40.9

Epilepsy, unspecified [+]

G43

Migraine [+]

Note:

the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

Use additional	code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Excludes 1:	headache NOS (R51.9) lower half migraine (G44.00)
Excludes 2:	headache syndromes (G44.-)

G43.0

Migraine without aura [+]
Common migraine

Excludes 1:

chronic migraine without aura (G43.7-)

G43.1

Migraine with aura [+]
Basilar migraine
Classical migraine
Migraine equivalents
Migraine preceded or accompanied by transient focal neurological phenomena
Migraine triggered seizures
Migraine with acute-onset aura
Migraine with aura without headache (migraine equivalents)
Migraine with prolonged aura
Migraine with typical aura
Retinal migraine

Code also	any associated seizure (G40.-, R56.9)
Excludes 1:	chronic migraine with aura (G43.E-) persistent migraine aura (G43.5-, G43.6-)

G43.4

Hemiplegic migraine [+]
Familial migraine
Sporadic migraine

G43.5

Persistent migraine aura without cerebral infarction [+]

G43.6

Persistent migraine aura with cerebral infarction [+]

Code also

the type of cerebral infarction (I63.-)

G43.7

Chronic migraine without aura [+]
Transformed migraine

Excludes 1:

migraine without aura (G43.0-)

G43.A

Cyclical vomiting [+]

Excludes 1:

cyclical vomiting syndrome unrelated to migraine (R11.15)

G43.B

Ophthalmoplegic migraine [+]

G43.C

Periodic headache syndromes in child or adult [+]

G43.D

Abdominal migraine [+]

G43.8

Other migraine [+]

G43.9

Migraine, unspecified [+]

G43.E

Chronic migraine with aura [+]

Excludes 1:

migraine with aura (G43.1-)

G44

Other headache syndromes [+]

Excludes 1:	headache NOS (R51.9)
Excludes 2:	atypical facial pain (G50.1) headache due to lumbar puncture (G97.1) migraines (G43.-) trigeminal neuralgia (G50.0)

G44.0

Cluster headaches and other trigeminal autonomic cephalgias (TAC) [+]

G44.00

Cluster headache syndrome, unspecified [+]
Ciliary neuralgia
Cluster headache NOS
Histamine cephalgia
Lower half migraine
Migrainous neuralgia

G44.01

Episodic cluster headache [+]

G44.02

Chronic cluster headache [+]

G44.03

Episodic paroxysmal hemicrania [+]
Paroxysmal hemicrania NOS

G44.04

Chronic paroxysmal hemicrania [+]

G44.05

Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) [+]

G44.09

Other trigeminal autonomic cephalgias (TAC) [+]

G44.1

Vascular headache, not elsewhere classified

Excludes 2:

cluster headache (G44.0)
complicated headache syndromes (G44.5-)
drug-induced headache (G44.4-)
migraine (G43.-)
other specified headache syndromes (G44.8-)
post-traumatic headache (G44.3-)
tension-type headache (G44.2-)

G44.2

Tension-type headache [+]

G44.20

Tension-type headache, unspecified [+]

G44.21

Episodic tension-type headache [+]

G44.22

Chronic tension-type headache [+]

G44.3

Post-traumatic headache [+]

G44.30

Post-traumatic headache, unspecified [+]

G44.31

Acute post-traumatic headache [+]

G44.32

Chronic post-traumatic headache [+]

G44.4

Drug-induced headache, not elsewhere classified [+]
Medication overuse headache

Use additional

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

G44.5

Complicated headache syndromes [+]

G44.8

Other specified headache syndromes [+]

Excludes 2:

headache with orthostatic or positional component, not elsewhere classified (R51.0)

G45

Transient cerebral ischemic attacks and related syndromes [+]

Excludes 1:

neonatal cerebral ischemia (P91.0)
transient retinal artery occlusion (H34.0-)

G46

Vascular syndromes of brain in cerebrovascular diseases [+]

Code first

underlying cerebrovascular disease (I60-I69)

G47

Sleep disorders [+]

Excludes 2:

nightmares (F51.5)
nonorganic sleep disorders (F51.-)
sleep terrors (F51.4)
sleepwalking (F51.3)

G47.0

Insomnia [+]

Excludes 2:

alcohol related insomnia (F10.182, F10.282, F10.982)
drug-related insomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
idiopathic insomnia (F51.01)
insomnia due to a mental disorder (F51.05)
insomnia not due to a substance or known physiological condition (F51.0-)
nonorganic insomnia (F51.0-)
primary insomnia (F51.01)
sleep apnea (G47.3-)

G47.1

Hypersomnia [+]

Excludes 2:

alcohol-related hypersomnia (F10.182, F10.282, F10.982)
drug-related hypersomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
hypersomnia due to a mental disorder (F51.13)
hypersomnia not due to a substance or known physiological condition (F51.1-)
primary hypersomnia (F51.11)
sleep apnea (G47.3-)

G47.2

Circadian rhythm sleep disorders [+]
Disorders of the sleep wake schedule
Inversion of nyctohemeral rhythm
Inversion of sleep rhythm

G47.3

Sleep apnea [+]

Code also	any associated underlying condition
Excludes 1:	apnea NOS (R06.81) Cheyne-Stokes breathing (R06.3) pickwickian syndrome (E66.2) sleep apnea of newborn (P28.3-)

G47.4

Narcolepsy and cataplexy [+]

G47.5

Parasomnia [+]

Excludes 1:

alcohol induced parasomnia (F10.182, F10.282, F10.982)
drug induced parasomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
parasomnia not due to a substance or known physiological condition (F51.8)

G47.6

Sleep related movement disorders [+]

Excludes 2:

restless legs syndrome (G25.81)

G47.8

Other sleep disorders
Other specified sleep-wake disorder

G47.9

Sleep disorder, unspecified
Sleep disorder NOS
Unspecified sleep-wake disorder