Chapter VI
Diseases of the nervous system
(G00-G99)

Rules Conventions GCS

Episodic and paroxysmal disorders
(G40-G47)

G40 Epilepsy
DCS.VI.1

Excl.:
Landau-Kleffner syndrome ( F80.3)
seizure (convulsive) NOS ( R56.8)
status epilepticus ( G41.-)
Todd paralysis ( G83.8)
G40.0 Localization-related (focal)(partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset
Incl.:
Benign childhood epilepsy with centrotemporal EEG spikes
Childhood epilepsy with occipital EEG paroxysms
G40.1 Localization-related (focal)(partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures
Incl.:
Attacks without alteration of consciousness
Simple partial seizures developing into secondarily generalized seizures
G40.2 Localization-related (focal)(partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures
Incl.:
Attacks with alteration of consciousness, often with automatisms
Complex partial seizures developing into secondarily generalized seizures
G40.3 Generalized idiopathic epilepsy and epileptic syndromes
Incl.:
Benign:
  • myoclonic epilepsy in infancy
  • neonatal convulsions (familial)
Childhood absence epilepsy [pyknolepsy]
Epilepsy with grand mal seizures on awakening
Juvenile:
  • absence epilepsy
  • myoclonic epilepsy [impulsive petit mal]
Nonspecific epileptic seizures:
  • atonic
  • clonic
  • myoclonic
  • tonic
  • tonic-clonic
G40.4 Other generalized epilepsy and epileptic syndromes
Incl.:
Epilepsy with:
  • myoclonic absences
  • myoclonic-astatic seizures
Infantile spasms
Lennox-Gastaut syndrome
Salaam attacks
Symptomatic early myoclonic encephalopathy
West syndrome
G40.5 Special epileptic syndromes
Incl.:
Epilepsia partialis continua [Kozhevnikof]
Epileptic seizures related to:
  • alcohol
  • drugs
  • hormonal changes
  • sleep deprivation
  • stress
Coding-Hint
Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.
G40.6 Grand mal seizures, unspecified (with or without petit mal)
G40.7 Petit mal, unspecified, without grand mal seizures
G40.8 Other epilepsy
Incl.:
Epilepsies and epileptic syndromes undetermined as to whether they are focal or generalized
G40.9 Epilepsy, unspecified
Incl.:
Epileptic:
  • convulsions NOS
  • fits NOS
  • seizures NOS

G41 Status epilepticus
DCS.VI.1

G41.0 Grand mal status epilepticus
Incl.:
Tonic-clonic status epilepticus
Excl.:
epilepsia partialis continua [Kozhevnikof] ( G40.5)
G41.1 Petit mal status epilepticus
Incl.:
Epileptic absence status
G41.2 Complex partial status epilepticus
G41.8 Other status epilepticus
G41.9 Status epilepticus, unspecified

G43 Migraine

Coding-Hint
Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.
Excl.:
headache NOS ( R51)
G43.0 Migraine without aura [common migraine]
G43.1 Migraine with aura [classical migraine]
Incl.:
Migraine:
  • aura without headache
  • basilar
  • equivalents
  • familial hemiplegic
  • with:
    • —  acute-onset aura
    • —  prolonged aura
    • —  typical aura
G43.2 Status migrainosus
G43.3 Complicated migraine
G43.8 Other migraine
Incl.:
Ophthalmoplegic migraine
Retinal migraine
G43.9 Migraine, unspecified

G44 Other headache syndromes

Excl.:
atypical facial pain ( G50.1)
headache NOS ( R51)
trigeminal neuralgia ( G50.0)
G44.0 Cluster headache syndrome
Incl.:
Chronic paroxysmal hemicrania
Cluster headache:
  • chronic
  • episodic
G44.1 Vascular headache, not elsewhere classified
Incl.:
Vascular headache NOS
G44.2 Tension-type headache
Incl.:
Chronic tension-type headache
Episodic tension headache
Tension headache NOS
G44.3 Chronic post-traumatic headache
G44.4 Drug-induced headache, not elsewhere classified
Coding-Hint
Use additional external cause code (Chapter XX), if desired, to identify drug.
G44.8 Other specified headache syndromes

G45 Transient cerebral ischaemic attacks and related syndromes

Excl.:
neonatal cerebral ischaemia ( P91.0)
G45.0 Vertebro-basilar artery syndrome
G45.1 Carotid artery syndrome (hemispheric)
G45.2 Multiple and bilateral precerebral artery syndromes
G45.3 Amaurosis fugax
DCS.VI.2
G45.4 Transient global amnesia
Excl.:
amnesia NOS ( R41.3)
G45.8 Other transient cerebral ischaemic attacks and related syndromes
G45.9 Transient cerebral ischaemic attack, unspecified
Incl.:
Spasm of cerebral artery
Transient cerebral ischaemia NOS

G46* Vascular syndromes of brain in cerebrovascular diseases (I60-I67†)

G46.0* Middle cerebral artery syndrome (I66.0†)
G46.1* Anterior cerebral artery syndrome (I66.1†)
G46.2* Posterior cerebral artery syndrome (I66.2†)
G46.3* Brain stem stroke syndrome (I60-I67†)
Incl.:
Syndrome:
  • Benedikt
  • Claude
  • Foville
  • Millard-Gubler
  • Wallenberg
  • Weber
G46.4* Cerebellar stroke syndrome (I60-I67†)
G46.5* Pure motor lacunar syndrome (I60-I67†)
G46.6* Pure sensory lacunar syndrome (I60-I67†)
G46.7* Other lacunar syndromes (I60-I67†)
G46.8* Other vascular syndromes of brain in cerebrovascular diseases (I60-I67†)

G47 Sleep disorders

Excl.:
nightmares ( F51.5)
nonorganic sleep disorders ( F51.-)
sleep terrors ( F51.4)
sleepwalking ( F51.3)
G47.0 Disorders of initiating and maintaining sleep [insomnias]
G47.1 Disorders of excessive somnolence [hypersomnias]
G47.2 Disorders of the sleep-wake schedule
Incl.:
Delayed sleep phase syndrome
Irregular sleep-wake pattern
G47.3 Sleep apnoea
Incl.:
Sleep apnoea:
  • central
  • obstructive
Excl.:
pickwickian syndrome ( E66.2)
sleep apnoea of newborn ( P28.3)
G47.4 Narcolepsy and cataplexy
G47.8 Other sleep disorders
Incl.:
Kleine-Levin syndrome
G47.9 Sleep disorder, unspecified