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    v1.0.28
    OpenPayerBilling CodesEpisodic and paroxysmal disordersICD-10-CM g40-epilepsy-and-recurrent-seizures
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    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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    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 CodeDescription
    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
    G40.011Localization-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
    G40.101Localization-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
    G40.111Localization-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
    G40.201Localization-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
    G40.211Localization-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
    G40.301Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus
    G40.309Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus
    G40.311Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus
    G40.319Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus
    G40.401Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus
    G40.409Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus
    G40.411Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus
    G40.419Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus

    Showing 1–20 of 58

    DRG Codes

    3 rows

    DRG CodeDescription
    023Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
    100Seizures with MCC
    101Seizures 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. 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. 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. 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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