ICD-10-CM G40: Epilepsy and recurrent seizures

ICD-10-CM Diagnosis Code (2025)

Official Description for G40

Epilepsy and recurrent seizures

Coding Notes & Guidelines for G40

Excludes1: Not Coded Here
  • conversion disorder with seizures (F44.5)
  • convulsions NOS (R56.9)
  • post traumatic seizures (R56.1)
  • seizure (convulsive) NOS (R56.9)
  • seizure of newborn (P90)
Excludes1: Not Coded Here

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

Excludes1: Not Coded Here
  • post traumatic seizures (R56.1)
  • recurrent seizures NOS (G40.909)
  • seizure NOS (R56.9)
Excludes2: Not Included Here
  • hippocampal sclerosis (G93.81)
  • mesial temporal sclerosis (G93.81)
  • temporal sclerosis (G93.81)
  • Todd's paralysis (G83.84)
Use Additional Code
  • code, if known, to identify associated manifestations, such as:
  • cortical blindness (H47.61-)
  • global developmental delay (F88)
Use Additional Code

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

Inclusion Terms
  • Benign childhood epilepsy with centrotemporal EEG spikes
  • Childhood epilepsy with occipital EEG paroxysms
Inclusion Terms

Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset without intractability

Inclusion Terms

Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset NOS

Inclusion Terms
  • Attacks without alteration of consciousness
  • Epilepsia partialis continua [Kozhevnikof]
  • Simple partial seizures developing into secondarily generalized seizures
Inclusion Terms

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures without intractability

Inclusion Terms

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures NOS

Inclusion Terms
  • Attacks with alteration of consciousness, often with automatisms
  • Complex partial seizures developing into secondarily generalized seizures
Inclusion Terms

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures without intractability

Inclusion Terms

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures NOS

Inclusion Terms

Generalized idiopathic epilepsy and epileptic syndromes without intractability

Inclusion Terms

Generalized idiopathic epilepsy and epileptic syndromes NOS

Inclusion Terms
  • Childhood absence epilepsy [pyknolepsy]
  • Juvenile absence epilepsy
  • Absence epileptic syndrome, NOS
Inclusion Terms

Lafora body disease

Inclusion Terms

Lafora progressive myoclonus epilepsy NOS

Inclusion Terms
  • 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
Inclusion Terms
  • Other generalized epilepsy and epileptic syndromes without intractability
  • Other generalized epilepsy and epileptic syndromes NOS
Inclusion Terms

CDKL5

Inclusion Terms
  • 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
Inclusion Terms

Epileptic seizures related to external causes, NOS

Inclusion Terms
  • Epilepsies and epileptic syndromes undetermined as to whether they are focal or generalized
  • Landau-Kleffner syndrome
Inclusion Terms

Other epilepsy without intractability with status epilepticus

Inclusion Terms
  • Other epilepsy NOS
  • Other epilepsy without intractability without status epilepticus
Inclusion Terms
  • Infantile spasms
  • Salaam attacks
  • West's syndrome
Inclusion Terms
  • Polymorphic epilepsy in infancy (PMEI)
  • Severe myoclonic epilepsy in infancy (SMEI)
Inclusion Terms

Dravet syndrome NOS

Inclusion Terms

KCNQ2-related epilepsy NOS

Inclusion Terms

Epilepsy, unspecified, without intractability

Inclusion Terms
  • Epilepsy NOS
  • Epileptic convulsions NOS
  • Epileptic fits NOS
  • Epileptic seizures NOS
  • Recurrent seizures NOS
  • Seizure disorder NOS
Inclusion Terms

Intractable seizure disorder NOS

Code Also

MERRF syndrome, if applicable (E88.42)

Code Also

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

Code Also

, if applicable, associated epilepsy and recurrent seizures (G40.-)

Child Codes (More Specific Codes for G40):

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 G40.4 - 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 G40.42 - Cyclin-Dependent Kinase-Like 5 Deficiency Disorder 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 G40.83 - Dravet syndrome G40.833 - Dravet syndrome, intractable, with status epilepticus G40.834 - Dravet syndrome, intractable, without status epilepticus G40.84 - KCNQ2-related epilepsy G40.841 - KCNQ2-related epilepsy, not intractable, with status epilepticus G40.842 - KCNQ2-related epilepsy, not intractable, without status epilepticus G40.843 - KCNQ2-related epilepsy, intractable, with status epilepticus G40.844 - KCNQ2-related epilepsy, 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 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.C - Lafora progressive myoclonus epilepsy G40.C0 - Lafora progressive myoclonus epilepsy, not intractable G40.C01 - Lafora progressive myoclonus epilepsy, not intractable, with status epilepticus G40.C09 - Lafora progressive myoclonus epilepsy, not intractable, without status epilepticus G40.C1 - Lafora progressive myoclonus epilepsy, intractable G40.C11 - Lafora progressive myoclonus epilepsy, intractable, with status epilepticus G40.C19 - Lafora progressive myoclonus epilepsy, intractable, without status epilepticus

About ICD-10-CM Code G40 (Epilepsy and recurrent seizures)

ICD-10-CM code G40 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM G40 became effective on October 1, 2024.

This page provides detailed information about G40 - Epilepsy and recurrent seizures. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Epilepsy and recurrent seizures.