G40-G47Not billable, use a more specific code below
Episodic and paroxysmal disorders (G40-G47)
chapter 6: Diseases of the Nervous System
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers default dominant or nondominant side for hemiplegia and monoplegia, and use and sequencing of G89 pain codes, including postoperative, chronic, and neoplasm-related pain.
- Dominant/nondominant side (page 45)
- Pain - Category G89 (page 45)
All codes under G40-G47
G40-G47 can't be used on a claim. Pick a billable code below; grey headings group them.
- G40Epilepsy and recurrent seizures
- G40.0Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset
- G40.00Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable
- G40.001Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus
- G40.009Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus
- G40.01Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable
- G40.011Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus
- G40.019Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus
- G40.1Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures
- G40.10Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable
- G40.101Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with status epilepticus
- G40.109Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus
- G40.11Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable
- G40.111Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, with status epilepticus
- G40.119Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, without status epilepticus
- G40.2Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures
- G40.20Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable
- G40.201Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, with status epilepticus
- G40.209Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus
- G40.21Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable
- G40.211Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, with status epilepticus
- G40.219Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus
- G40.3Generalized idiopathic epilepsy and epileptic syndromes
- G40.30Generalized idiopathic epilepsy and epileptic syndromes, not intractable
- G40.301Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus
- G40.309Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus
- G40.31Generalized idiopathic epilepsy and epileptic syndromes, intractable
- G40.311Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus
- G40.319Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus
- G40.4Other generalized epilepsy and epileptic syndromes
- G40.40Other generalized epilepsy and epileptic syndromes, not intractable
- G40.401Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus
- G40.409Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus
- G40.41Other generalized epilepsy and epileptic syndromes, intractable
- G40.411Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus
- G40.419Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus
- G40.42Cyclin-Dependent Kinase-Like 5 Deficiency Disorder
- G40.5Epileptic seizures related to external causes
- G40.50Epileptic seizures related to external causes, not intractable
- G40.501Epileptic seizures related to external causes, not intractable, with status epilepticus
- G40.509Epileptic seizures related to external causes, not intractable, without status epilepticus
- G40.8Other epilepsy and recurrent seizures
- G40.80Other epilepsy
- G40.801Other epilepsy, not intractable, with status epilepticus
- G40.802Other epilepsy, not intractable, without status epilepticus
- G40.803Other epilepsy, intractable, with status epilepticus
- G40.804Other epilepsy, intractable, without status epilepticus
- G40.81Lennox-Gastaut syndrome
- G40.811Lennox-Gastaut syndrome, not intractable, with status epilepticus
- G40.812Lennox-Gastaut syndrome, not intractable, without status epilepticus
- G40.813Lennox-Gastaut syndrome, intractable, with status epilepticus
- G40.814Lennox-Gastaut syndrome, intractable, without status epilepticus
- G40.82Epileptic spasms
- G40.821Epileptic spasms, not intractable, with status epilepticus
- G40.822Epileptic spasms, not intractable, without status epilepticus
- G40.823Epileptic spasms, intractable, with status epilepticus
- G40.824Epileptic spasms, intractable, without status epilepticus
- G40.83Dravet syndrome
- G40.833Dravet syndrome, intractable, with status epilepticus
- G40.834Dravet syndrome, intractable, without status epilepticus
- G40.84KCNQ2-related epilepsy
- G40.841KCNQ2-related epilepsy, not intractable, with status epilepticus
- G40.842KCNQ2-related epilepsy, not intractable, without status epilepticus
- G40.843KCNQ2-related epilepsy, intractable, with status epilepticus
- G40.844KCNQ2-related epilepsy, intractable, without status epilepticus
- G40.89Other seizures
- G40.9Epilepsy, unspecified
- G40.90Epilepsy, unspecified, not intractable
- G40.901Epilepsy, unspecified, not intractable, with status epilepticus
- G40.909Epilepsy, unspecified, not intractable, without status epilepticus
- G40.91Epilepsy, unspecified, intractable
- G40.911Epilepsy, unspecified, intractable, with status epilepticus
- G40.919Epilepsy, unspecified, intractable, without status epilepticus
- G40.AAbsence epileptic syndrome
- G40.A0Absence epileptic syndrome, not intractable
- G40.A01Absence epileptic syndrome, not intractable, with status epilepticus
- G40.A09Absence epileptic syndrome, not intractable, without status epilepticus
- G40.A1Absence epileptic syndrome, intractable
- G40.A11Absence epileptic syndrome, intractable, with status epilepticus
- G40.A19Absence epileptic syndrome, intractable, without status epilepticus
- G40.BJuvenile myoclonic epilepsy [impulsive petit mal]
- G40.B0Juvenile myoclonic epilepsy, not intractable
- G40.B01Juvenile myoclonic epilepsy, not intractable, with status epilepticus
- G40.B09Juvenile myoclonic epilepsy, not intractable, without status epilepticus
- G40.B1Juvenile myoclonic epilepsy, intractable
- G40.B11Juvenile myoclonic epilepsy, intractable, with status epilepticus
- G40.B19Juvenile myoclonic epilepsy, intractable, without status epilepticus
- G40.CLafora progressive myoclonus epilepsy
- G40.C0Lafora progressive myoclonus epilepsy, not intractable
- G40.C01Lafora progressive myoclonus epilepsy, not intractable, with status epilepticus
- G40.C09Lafora progressive myoclonus epilepsy, not intractable, without status epilepticus
- G40.C1Lafora progressive myoclonus epilepsy, intractable
- G40.C11Lafora progressive myoclonus epilepsy, intractable, with status epilepticus
- G40.C19Lafora progressive myoclonus epilepsy, intractable, without status epilepticus
- G43Migraine
- G43.0Migraine without aura
- G43.00Migraine without aura, not intractable
- G43.001Migraine without aura, not intractable, with status migrainosus
- G43.009Migraine without aura, not intractable, without status migrainosus
- G43.01Migraine without aura, intractable
- G43.011Migraine without aura, intractable, with status migrainosus
- G43.019Migraine without aura, intractable, without status migrainosus
- G43.1Migraine with aura
- G43.10Migraine with aura, not intractable
- G43.101Migraine with aura, not intractable, with status migrainosus
- G43.109Migraine with aura, not intractable, without status migrainosus
- G43.11Migraine with aura, intractable
- G43.111Migraine with aura, intractable, with status migrainosus
- G43.119Migraine with aura, intractable, without status migrainosus
- G43.4Hemiplegic migraine
- G43.40Hemiplegic migraine, not intractable
- G43.401Hemiplegic migraine, not intractable, with status migrainosus
- G43.409Hemiplegic migraine, not intractable, without status migrainosus
- G43.41Hemiplegic migraine, intractable
- G43.411Hemiplegic migraine, intractable, with status migrainosus
- G43.419Hemiplegic migraine, intractable, without status migrainosus
- G43.5Persistent migraine aura without cerebral infarction
- G43.50Persistent migraine aura without cerebral infarction, not intractable
- G43.501Persistent migraine aura without cerebral infarction, not intractable, with status migrainosus
- G43.509Persistent migraine aura without cerebral infarction, not intractable, without status migrainosus
- G43.51Persistent migraine aura without cerebral infarction, intractable
- G43.511Persistent migraine aura without cerebral infarction, intractable, with status migrainosus
- G43.519Persistent migraine aura without cerebral infarction, intractable, without status migrainosus
- G43.6Persistent migraine aura with cerebral infarction
- G43.60Persistent migraine aura with cerebral infarction, not intractable
- G43.601Persistent migraine aura with cerebral infarction, not intractable, with status migrainosus
- G43.609Persistent migraine aura with cerebral infarction, not intractable, without status migrainosus
- G43.61Persistent migraine aura with cerebral infarction, intractable
- G43.611Persistent migraine aura with cerebral infarction, intractable, with status migrainosus
- G43.619Persistent migraine aura with cerebral infarction, intractable, without status migrainosus
- G43.7Chronic migraine without aura
- G43.70Chronic migraine without aura, not intractable
- G43.701Chronic migraine without aura, not intractable, with status migrainosus
- G43.709Chronic migraine without aura, not intractable, without status migrainosus
- G43.71Chronic migraine without aura, intractable
- G43.711Chronic migraine without aura, intractable, with status migrainosus
- G43.719Chronic migraine without aura, intractable, without status migrainosus
- G43.8Other migraine
- G43.80Other migraine, not intractable
- G43.801Other migraine, not intractable, with status migrainosus
- G43.809Other migraine, not intractable, without status migrainosus
- G43.81Other migraine, intractable
- G43.811Other migraine, intractable, with status migrainosus
- G43.819Other migraine, intractable, without status migrainosus
- G43.82Menstrual migraine, not intractable
- G43.821Menstrual migraine, not intractable, with status migrainosus
- G43.829Menstrual migraine, not intractable, without status migrainosus
- G43.83Menstrual migraine, intractable
- G43.831Menstrual migraine, intractable, with status migrainosus
- G43.839Menstrual migraine, intractable, without status migrainosus
- G43.9Migraine, unspecified
- G43.90Migraine, unspecified, not intractable
- G43.901Migraine, unspecified, not intractable, with status migrainosus
- G43.909Migraine, unspecified, not intractable, without status migrainosus
- G43.91Migraine, unspecified, intractable
- G43.911Migraine, unspecified, intractable, with status migrainosus
- G43.919Migraine, unspecified, intractable, without status migrainosus
- G43.ACyclical vomiting
- G43.A0Cyclical vomiting, in migraine, not intractable
- G43.A1Cyclical vomiting, in migraine, intractable
- G43.BOphthalmoplegic migraine
- G43.B0Ophthalmoplegic migraine, not intractable
- G43.B1Ophthalmoplegic migraine, intractable
- G43.CPeriodic headache syndromes in child or adult
- G43.C0Periodic headache syndromes in child or adult, not intractable
- G43.C1Periodic headache syndromes in child or adult, intractable
- G43.DAbdominal migraine
- G43.D0Abdominal migraine, not intractable
- G43.D1Abdominal migraine, intractable
- G43.EChronic migraine with aura
- G43.E0Chronic migraine with aura, not intractable
- G43.E01Chronic migraine with aura, not intractable, with status migrainosus
- G43.E09Chronic migraine with aura, not intractable, without status migrainosus
- G43.E1Chronic migraine with aura, intractable
- G43.E11Chronic migraine with aura, intractable, with status migrainosus
- G43.E19Chronic migraine with aura, intractable, without status migrainosus
- G44Other headache syndromes
- G44.0Cluster headaches and other trigeminal autonomic cephalgias (TAC)
- G44.00Cluster headache syndrome, unspecified
- G44.001Cluster headache syndrome, unspecified, intractable
- G44.009Cluster headache syndrome, unspecified, not intractable
- G44.01Episodic cluster headache
- G44.011Episodic cluster headache, intractable
- G44.019Episodic cluster headache, not intractable
- G44.02Chronic cluster headache
- G44.021Chronic cluster headache, intractable
- G44.029Chronic cluster headache, not intractable
- G44.03Episodic paroxysmal hemicrania
- G44.031Episodic paroxysmal hemicrania, intractable
- G44.039Episodic paroxysmal hemicrania, not intractable
- G44.04Chronic paroxysmal hemicrania
- G44.041Chronic paroxysmal hemicrania, intractable
- G44.049Chronic paroxysmal hemicrania, not intractable
- G44.05Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT)
- G44.051Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable
- G44.059Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable
- G44.09Other trigeminal autonomic cephalgias (TAC)
- G44.091Other trigeminal autonomic cephalgias (TAC), intractable
- G44.099Other trigeminal autonomic cephalgias (TAC), not intractable
- G44.1Vascular headache, not elsewhere classified
- G44.2Tension-type headache
- G44.20Tension-type headache, unspecified
- G44.201Tension-type headache, unspecified, intractable
- G44.209Tension-type headache, unspecified, not intractable
- G44.21Episodic tension-type headache
- G44.211Episodic tension-type headache, intractable
- G44.219Episodic tension-type headache, not intractable
- G44.22Chronic tension-type headache
- G44.221Chronic tension-type headache, intractable
- G44.229Chronic tension-type headache, not intractable
- G44.3Post-traumatic headache
- G44.30Post-traumatic headache, unspecified
- G44.301Post-traumatic headache, unspecified, intractable
- G44.309Post-traumatic headache, unspecified, not intractable
- G44.31Acute post-traumatic headache
- G44.311Acute post-traumatic headache, intractable
- G44.319Acute post-traumatic headache, not intractable
- G44.32Chronic post-traumatic headache
- G44.321Chronic post-traumatic headache, intractable
- G44.329Chronic post-traumatic headache, not intractable
- G44.4Drug-induced headache, not elsewhere classified
- G44.40Drug-induced headache, not elsewhere classified, not intractable
- G44.41Drug-induced headache, not elsewhere classified, intractable
- G44.5Complicated headache syndromes
- G44.51Hemicrania continua
- G44.52New daily persistent headache (NDPH)
- G44.53Primary thunderclap headache
- G44.59Other complicated headache syndrome
- G44.8Other specified headache syndromes
- G44.81Hypnic headache
- G44.82Headache associated with sexual activity
- G44.83Primary cough headache
- G44.84Primary exertional headache
- G44.85Primary stabbing headache
- G44.86Cervicogenic headache
- G44.89Other headache syndrome
- G45Transient cerebral ischemic attacks and related syndromes
- G45.0Vertebro-basilar artery syndrome
- G45.1Carotid artery syndrome (hemispheric)
- G45.2Multiple and bilateral precerebral artery syndromes
- G45.3Amaurosis fugax
- G45.4Transient global amnesia
- G45.8Other transient cerebral ischemic attacks and related syndromes
- G45.9Transient cerebral ischemic attack, unspecified
- G46Vascular syndromes of brain in cerebrovascular diseases
- G46.0Middle cerebral artery syndrome
- G46.1Anterior cerebral artery syndrome
- G46.2Posterior cerebral artery syndrome
- G46.3Brain stem stroke syndrome
- G46.4Cerebellar stroke syndrome
- G46.5Pure motor lacunar syndrome
- G46.6Pure sensory lacunar syndrome
- G46.7Other lacunar syndromes
- G46.8Other vascular syndromes of brain in cerebrovascular diseases
- G47Sleep disorders
- G47.0Insomnia
- G47.00Insomnia, unspecified
- G47.01Insomnia due to medical condition
- G47.09Other insomnia
- G47.1Hypersomnia
- G47.10Hypersomnia, unspecified
- G47.11Idiopathic hypersomnia with long sleep time
- G47.12Idiopathic hypersomnia without long sleep time
- G47.13Recurrent hypersomnia
- G47.14Hypersomnia due to medical condition
- G47.19Other hypersomnia
- G47.2Circadian rhythm sleep disorders
- G47.20Circadian rhythm sleep disorder, unspecified type
- G47.21Circadian rhythm sleep disorder, delayed sleep phase type
- G47.22Circadian rhythm sleep disorder, advanced sleep phase type
- G47.23Circadian rhythm sleep disorder, irregular sleep wake type
- G47.24Circadian rhythm sleep disorder, free running type
- G47.25Circadian rhythm sleep disorder, jet lag type
- G47.26Circadian rhythm sleep disorder, shift work type
- G47.27Circadian rhythm sleep disorder in conditions classified elsewhere
- G47.29Other circadian rhythm sleep disorder
- G47.3Sleep apnea
- G47.30Sleep apnea, unspecified
- G47.31Primary central sleep apnea
- G47.32High altitude periodic breathing
- G47.33Obstructive sleep apnea (adult) (pediatric)
- G47.34Idiopathic sleep related nonobstructive alveolar hypoventilation
- G47.35Congenital central alveolar hypoventilation syndrome
- G47.36Sleep related hypoventilation in conditions classified elsewhere
- G47.37Central sleep apnea in conditions classified elsewhere
- G47.39Other sleep apnea
- G47.4Narcolepsy and cataplexy
- G47.41Narcolepsy
- G47.411Narcolepsy with cataplexy
- G47.419Narcolepsy without cataplexy
- G47.42Narcolepsy in conditions classified elsewhere
- G47.421Narcolepsy in conditions classified elsewhere with cataplexy
- G47.429Narcolepsy in conditions classified elsewhere without cataplexy
- G47.5Parasomnia
- G47.50Parasomnia, unspecified
- G47.51Confusional arousals
- G47.52REM sleep behavior disorder
- G47.53Recurrent isolated sleep paralysis
- G47.54Parasomnia in conditions classified elsewhere
- G47.59Other parasomnia
- G47.6Sleep related movement disorders
- G47.61Periodic limb movement disorder
- G47.62Sleep related leg cramps
- G47.63Sleep related bruxism
- G47.69Other sleep related movement disorders
- G47.8Other sleep disorders
- G47.9Sleep disorder, unspecified
G40-G47 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Epilepsy
Epilepsy is a brain disorder that causes people to have recurring seizures. The seizures happen when clusters of nerve cells, or neurons, in the brain send out the wrong signals. People may have strange sensations and emotions or behave strangely. They may have violent muscle spasms or lose consciousness.
Read more about epilepsy on MedlinePlus