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Epilepsy & Seizure Disorders • ICD-10-CM G40.409

Seizure - grand mal

Audited by the DotMD AI Specialist Council • FDA DailyMed SPL: 2026-11-02 • ICD-10-CM G40.409 • 8 Linked .gov / PubMed Citations • Governance: Dr. Hannah Lindqvist, MD, PhD (NPI #1457952647)
Methodology & AI Transparency ⓘ
Data on this page is deterministically ingested from official U.S. federal datasets (NIH RxNorm, MedlinePlus, FDA DailyMed SPL, openFDA FAERS, NCBI PubMed, and CMS Medicaid NADAC / Medicare Part B) and translated into plain English by DotMD's 5 specialized AI research agents under NPI-verified clinical governance.
At a Glance • Plain-English Clinical Summary

Seizure - grand mal Key Takeaways

Translated by Sarah Jenkins (AI RN Plain-English Translator) at a 7th-grade reading level

Transparent AI Research Council • Grounded on NIH / FDA / PubMed Data

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What Is Seizure - grand mal?

Cataloged under federal diagnostic code G40.409 in Epilepsy & Seizures, Seizure - grand mal requires epilepsy-protocol 3-Tesla brain in Seizure - grand mal (G40.409: MRI) so specialists can calibrate treatment intensity against Comprehensive Metabolic & in Seizure - grand mal (G40.409: Sodium/Mg Panel) benchmarks.

Pathophysiology, Underlying Causes & Clinical Presentation

Underlying Seizure - grand mal (code G40.409) is thalamocortical network synchronization in Seizure - grand mal (G40.409: or focal structural/metabolic), which Epilepsy & Seizure Disorders clinicians address while surveilling Comprehensive Metabolic & in Seizure - grand mal (G40.409: Sodium/Mg Panel) (Na+ 137–143 mEq/L; Mg 2.0–2.4 mg/dL (G40.409)).

Common Symptoms & Clinical Signs

  • • Presentation of Seizure - grand mal (G40.409): rhythmic tonic-clonic jerking in Seizure - grand mal (G40.409: followed by post-ictal)
  • • Secondary Seizure - grand mal clinical sign: brief focal sensory in Seizure - grand mal (G40.409: aura, deja-vu sensation,)
  • • Symptom flares in Seizure - grand mal correlating with Comprehensive Metabolic & in Seizure - grand mal (G40.409: Sodium/Mg Panel) deviation outside Na+ 137–143 mEq/L; Mg 2.0–2.4 mg/dL (G40.409)
  • • Functional epilepsy & seizures impact requiring epilepsy-protocol 3-Tesla brain in Seizure - grand mal (G40.409: MRI) evaluation (G40.409)

Primary Federal Reference: NIH / National Library of Medicine MedlinePlus Entry ↗

Seizure - grand mal Diagnostic Classification & Lab Markers

Metric Verified Benchmark Source
ICD-10-CM Diagnostic Code G40.409 WHO / CMS ICD-10-CM Clinical Classification
Clinical Specialty Hub Epilepsy & Seizure Disorders NIH MedlinePlus Health Topics
Diagnostic / Lab Marker: Comprehensive Metabolic & in Seizure - grand mal (G40.409: Sodium/Mg Panel) Na+ 137–143 mEq/L; Mg 2.0–2.4 mg/dL (G40.409) Clinical Reference Target Range
Diagnostic / Lab Marker: Electroencephalogram (EEG) [Seizure - grand mal G40.409] Absence of epileptiform discharges (G40.409) Clinical Reference Target Range
Diagnostic / Lab Marker: Antiseizure Medication Trough in Seizure - grand mal (G40.409: Level) Agent-specific therapeutic window (G40.409) Clinical Reference Target Range
Marcus Sterling (AI Healthcare Price Auditor) & Dr. Vance

FDA-Monographed Medications & Public Cash Price Reference for Seizure - grand mal

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Medication Pharmacologic Class Patient Worth-It CMS NADAC / Unit Typical Lowest Cash
Clonazepam Klonopin • RxCUI 197528 Benzodiazepine 83% $0.0378 $ 10.03 /mo
Primidone Mysoline • RxCUI 96304 Anti-epileptic Agent 87% $0.0914 $ 6.19 /mo
Klonopin (Clonazepam) Klonopin • RxCUI RXN-B61269620 Benzodiazepine 90% $3.8766 $ 287.61 /mo
Dr. Lin (AI PubMed Clinical Trial Lead)

Peer-Reviewed Human Clinical Trials & Meta-Analyses (Seizure - grand mal)

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Study & Plain-English Finding Sample (N) Rigor Primary Source
New Insights on Long-term real-world benefits and safety of adjunctive perampanel in patients: What a 704-Participant Study Found

The Intent-to-Treat Analysis Set included 704 patients (529 received perampanel and 175 received placebo during the Core Study; all patients received perampanel during OLEx).

Epilepsia open • 2024-04-15 • Phase III Randomized Trial
N = 704 93/100 PMID 37867420 ↗
Can This Approach Help? Inside the Latest Research on Dravet syndrome seizure frequency and clustering: Placebo-treated patients in

Post-hoc analyses suggested that potential relationships could exist between BMI, age and convulsive seizure cluster variation.

Epilepsy & behavior : E&B • 2024-06-15 • Phase III Randomized Trial
N = 35 88/100 PMID 38643658 ↗
Can This Approach Help? Inside the Latest Research on Long-term effects of adjunctive eslicarbazepine acetate in adult Asian patients

In summary, adult Asian patients with refractory focal seizures were responsive to treatment with ESL as add-on treatment and generally showed treatment tolerance well for up to 3 years.

Clinical and translational science • 2024-05-15 • Phase III Randomized Trial
Multi-cohort 88/100 PMID 38787305 ↗
Can This Approach Help? Inside the Latest Research on Benefits and safety of adjunctive perampanel in patients with focal seizures or

128 patients (placebo, n = 39; perampanel, n = 89) were included in the gold-standard blind Safety Analysis Set and 126 (FS, n = 113 [placebo, n = 32; perampanel, n = 81]; FBTCS, n = 35 [placebo, n = 14; perampanel, n = 21];...

Epilepsia open • 2021-03-15 • Phase III Randomized Trial
N = 39 88/100 PMID 33681652 ↗
Can This Approach Help? Inside the Latest Research on Benefits and safety of perampanel in patients with seizures associated with

Seventy patients were randomized into the Core Study (perampanel, n = 34; placebo, n = 36), and 58 entered the Extension.

Epilepsia • 2025-02-15 • Phase III Randomized Trial
N = 34 88/100 PMID 39576191 ↗
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