ICD-10-CM Code For Epilepsy And Recurrent Seizures: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G40 includes epilepsy syndromes and recurring seizure disorders, covering generalized, focal, and unspecified epileptic events as well as seizure control status. These ICD-10-CM diagnosis codes are used to document clinical scenarios such as new-onset epilepsy, recurrent unprovoked seizures, seizure type specification, and control or intractability of seizures. Accurate coding within the ICD-10-CM G40 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM G40: Epilepsy And Recurrent Seizures Overview

The diagnoses in this group represent epileptic disorders and recurrent seizure conditions affecting the nervous system, particularly the brain. These codes capture seizure type, etiology when specified, and whether seizures are controlled or uncontrolled. Accurate coding matters for clinical documentation, epidemiology, and appropriate reimbursement for neurological care.

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ICD-10-CM Code For Epilepsy And Recurrent Seizures: Group Overview

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ICD-10-CM G40: Epilepsy And Recurrent Seizures Overview

When to Use

Use a code from this group when documenting a diagnosis of epilepsy or recurrent unprovoked seizures, specifying seizure type and control status when available. Apply these codes for clinical encounters involving seizure diagnosis, management, follow-up, or complications related to epilepsy.

ICD-10-CM Codes

58 rows

ICD-10-CM Code	Description
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
G40.011	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
G40.101	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
G40.111	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
G40.201	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
G40.211	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
G40.301	Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus
G40.309	Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus
G40.311	Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus
G40.319	Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus
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
G40.411	Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus
G40.419	Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus

Showing 1–20 of 58

DRG Codes

3 rows

DRG Code	Description
023	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
100	Seizures with MCC
101	Seizures without MCC

Typical Clinical Scenarios

An adult is brought to the emergency department after a witnessed generalized tonic-clonic seizure with postictal confusion and tongue biting; there is no known prior history of seizures and initial labs and head CT are unremarkable. The encounter is for evaluation and acute management of the new-onset unprovoked seizure episode, and a seizure disorder diagnosis from this group is assigned pending further workup. Typical codes: G40.901, G40.909
A young adult with a long-standing diagnosis of focal epilepsy presents for routine follow-up because of increasing focal aware and focal impaired-awareness seizures despite medication adjustments; the visit documents chronic, recurrent seizures and ongoing maintenance of anti-seizure therapy. A code from this group is used to capture the chronic/ongoing epileptic disorder and seizure type for longitudinal care and medication management. Typical codes: G40.201, G40.209
An older patient with a known epilepsy disorder arrives after a cluster of breakthrough seizures following a missed dose of antiseizure medication, complicated by a minor head laceration and decline in level of consciousness requiring observation. The seizure exacerbation as a complication of established epilepsy is coded to reflect the recurrent seizure disorder and the acute change in seizure control. Typical codes: G40.311, G40.319

Related Codes

G43-MIGRAINE-DISORDERS

ICD-10-CM Code For Migraine: Group Overview

G44-OTHER-HEADACHE-SYNDROMES

ICD-10-CM Code For Other Headache Syndromes: Group Overview

G45-TRANSIENT-CEREBRAL-ISCHEMIC-ATTACKS

ICD-10-CM Code For Transient Cerebral Ischemic Attacks And Related Syndromes: Group Overview

G46-VASCULAR-SYNDROMES-OF-BRAIN

ICD-10-CM Code For Vascular Syndromes Of Brain In Cerebrovascular Diseases: Group Overview

G47-SLEEP-DISORDERS

ICD-10-CM Code For Sleep Disorders: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

58 rows

ICD-10-CM Code	Description
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
G40.011	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
G40.101	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
G40.111	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
G40.201	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
G40.211	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
G40.301	Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus
G40.309	Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus
G40.311	Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus
G40.319	Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus
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
G40.411	Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus
G40.419	Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus

Showing 1–20 of 58

DRG Codes

3 rows

DRG Code	Description
023	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
100	Seizures with MCC
101	Seizures without MCC

Typical Clinical Scenarios

An adult is brought to the emergency department after a witnessed generalized tonic-clonic seizure with postictal confusion and tongue biting; there is no known prior history of seizures and initial labs and head CT are unremarkable. The encounter is for evaluation and acute management of the new-onset unprovoked seizure episode, and a seizure disorder diagnosis from this group is assigned pending further workup. Typical codes: G40.901, G40.909
A young adult with a long-standing diagnosis of focal epilepsy presents for routine follow-up because of increasing focal aware and focal impaired-awareness seizures despite medication adjustments; the visit documents chronic, recurrent seizures and ongoing maintenance of anti-seizure therapy. A code from this group is used to capture the chronic/ongoing epileptic disorder and seizure type for longitudinal care and medication management. Typical codes: G40.201, G40.209
An older patient with a known epilepsy disorder arrives after a cluster of breakthrough seizures following a missed dose of antiseizure medication, complicated by a minor head laceration and decline in level of consciousness requiring observation. The seizure exacerbation as a complication of established epilepsy is coded to reflect the recurrent seizure disorder and the acute change in seizure control. Typical codes: G40.311, G40.319

Related Codes

G43-MIGRAINE-DISORDERS

ICD-10-CM Code For Migraine: Group Overview

G44-OTHER-HEADACHE-SYNDROMES

ICD-10-CM Code For Other Headache Syndromes: Group Overview

G45-TRANSIENT-CEREBRAL-ISCHEMIC-ATTACKS

ICD-10-CM Code For Transient Cerebral Ischemic Attacks And Related Syndromes: Group Overview

G46-VASCULAR-SYNDROMES-OF-BRAIN

ICD-10-CM Code For Vascular Syndromes Of Brain In Cerebrovascular Diseases: Group Overview

G47-SLEEP-DISORDERS

ICD-10-CM Code For Sleep Disorders: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Epilepsy And Recurrent Seizures: Group Overview

Sign up for ICD-10-CM Code For Epilepsy And Recurrent Seizures: Group Overview policy alerts

ICD-10-CM G40: Epilepsy And Recurrent Seizures Overview

ICD-10-CM Code For Epilepsy And Recurrent Seizures: Group Overview

Sign up for ICD-10-CM Code For Epilepsy And Recurrent Seizures: Group Overview policy alerts

ICD-10-CM G40: Epilepsy And Recurrent Seizures Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM group covers epilepsy and recurrent seizures?

How do `G40` codes indicate seizure control or intractability?

How are status epilepticus and seizure type represented in `G40` codes?

Are specific syndromes and genetic-related epilepsies listed within the `G40` group?

Which related DRGs are commonly associated with `G40` principal diagnoses?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM group covers epilepsy and recurrent seizures?

How do `G40` codes indicate seizure control or intractability?

How are status epilepticus and seizure type represented in `G40` codes?

Are specific syndromes and genetic-related epilepsies listed within the `G40` group?

Which related DRGs are commonly associated with `G40` principal diagnoses?

References