2026 ICD-10-CM Diagnosis Code G40.802Other epilepsy, not intractable, without status epilepticus

ICD-10-CM Codes›G00–G99›G40-G47›G40

ICD-10-CM G40.802
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G40.802 is a billable ICD-10-CM diagnosis code for other epilepsy, not intractable, without status epilepticus. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 100 through 101. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Epilepsy; convulsions.

Code Identity

ICD-10-CM Code
G40.802
Billable Status
Yes — Valid for Submission
Code Describes
Other epilepsy, not intractable, without status epilepticus
Short Description
Other epilepsy, not intractable, without status epilepticus
Same as the full description in the CMS dataset.
Parent Code
G40.80
Other epilepsy

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG40Epilepsy and recurrent seizures
This CodeG40.802Other epilepsy, not intractable, without status epilepticus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Amelocerebrohypohidrotic syndrome
  • Anoxic epileptic seizure
  • Anoxic seizure
  • Aquagenic epilepsy
  • Audiogenic epilepsy
  • Combined focal and generalized epilepsy
  • Cursive epilepsy
  • Decision-making epilepsy
  • Developmental aphasia
  • Disorder of beta and omega amino acid metabolism
  • Disorder of gamma aminobutyric acid metabolism
  • Eating epilepsy
  • Epilepsy with continuous spike wave during slow-wave sleep
  • Epileptic encephalopathy
  • Febrile infection-related epilepsy syndrome
  • Focal onset sensory epileptic seizure
  • Focal onset sensory epileptic seizure with olfactory symptoms
  • Focal onset sensory epileptic seizure with visual symptoms
  • Hot water reflex epilepsy
  • Landau-Kleffner syndrome
  • Menstrual epilepsy
  • Micturition induced epilepsy
  • Musicogenic seizure
  • New-onset refractory status epilepticus
  • Orgasm induced epilepsy
  • P5PD developmental and epileptic encephalopathy
  • Photogenic epilepsy
  • Pyridoxine-dependent developmental and epileptic encephalopathy
  • Reflex epilepsy
  • SCN8A developmental and epileptic encephalopathy
  • Secondary reading epilepsy
  • Situation-related seizures
  • Startle epilepsy
  • Stress-induced epilepsy
  • Thinking epilepsy
  • Toothbrushing epilepsy
  • Visual epilepsy
  • Visual reflex epilepsy
  • Writing epilepsy

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Other epilepsy NOS
  • Other epilepsy without intractability without status epilepticus

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)
      • specified NEC
    • Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)
      • specified NEC
        • not intractable
    • Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)
      • specified NEC
        • not intractable
          • without status epilepticus
    • Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)
      • syndromes
        • specified NEC
    • Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)
      • syndromes
        • specified NEC
          • not intractable
    • Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)
      • syndromes
        • specified NEC
          • not intractable
            • without status epilepticus

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS009
Epilepsy; convulsions
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Reflex Epilepsy

    epilepsy triggered by an external stimulus or an internal mental process. photosensitive epilepsy is the most common form of reflex epilepsy.

Patient EducationClinical

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 the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G40.802 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
345.80 Epilep NEC w/o intr epil
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G40.802Overview

Is G40.802 (Other epilepsy) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other epilepsy, not intractable, without status epilepticus on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does G40.802 group to?

When other epilepsy, not intractable, without status epilepticus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 100, 101, with relative weights from 0.9026 to 1.9368 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of G40.802?

Under the General Equivalence Mappings, other epilepsy, not intractable, without status epilepticus converts to ICD-9-CM 345.80 (epilep NEC w/o intr epil). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.