G40.909 Epilepsy, unspecified, not intractable, without status epilepticus

The ICD-10-CM code for Epilepsy, unspecified, not intractable, without status epilepticus is G40.909 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

6: Diseases of the nervous system (G00-G99)

Section

G40-G47: Episodic and paroxysmal disorders (G40-G47)

Category G40

94 codes (58 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to G40.909:

• Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure)
• Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure) › not intractable
• Seizure (s) › recurrent
• Seizure (s) › disorder
• Disorder (of) › seizure
• Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure) › not intractable › without status epilepticus

Inclusion Terms

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

U.S. Hospital Utilization

• An estimated 886,510 U.S. inpatient stays in 2023 included G40.909 among the documented diagnoses.
• 78,630 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Prevalence & Statistics

• During 2021 and 2022, about 2.9 million U.S. adults aged 18 and older (about 1% of all U.S. adults) reported having active epilepsy. (CDC Epilepsy Facts and Stats (National Center for Chronic Disease Prevention and Health Promotion), 2021-2022)

Official Coding Guidelines

Dominant/nondominant side (TOC entry)

a. Dominant/nondominant side ................................................................................................. 45

Pain - Category G89 (TOC entry)

b. Pain - Category G89.............................................................................................................. 45

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)
• CDC Epilepsy Facts and Stats (National Center for Chronic Disease Prevention and Health Promotion) (2021-2022)

Cite This Page

Reference G40.909 with the canonical source and edition:

G40.909 — Epilepsy, unspecified, not intractable, without status epilepticus. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/G40.909

Canonical URL: https://icd10codingpro.com/codes/G40.909