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G40 ⚠ Non-billable

Epilepsy and recurrent seizures

ICD-10-CM · FY2026 · Diseases of the Nervous System

Code
G40
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Nervous System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Excludes1 — never code together
  • conversion disorder with seizures (F44.5)
  • convulsions NOS (R56.9)
  • post traumatic seizures (R56.1)
  • seizure (convulsive) NOS (R56.9)
  • seizure of newborn (P90)
Excludes2 — not included here, but may code together
  • hippocampal sclerosis (G93.81)
  • mesial temporal sclerosis (G93.81)
  • temporal sclerosis (G93.81)
  • Todd's paralysis (G83.84)
Note
  • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

Frequently asked questions

What is ICD-10 code G40?
ICD-10-CM code G40 represents Epilepsy and recurrent seizures. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Nervous System chapter, effective October 1, 2025 – September 30, 2026.
Is G40 billable?
No. G40 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is G40 in?
G40 belongs to the Diseases of the Nervous System chapter (G00–G99) of ICD-10-CM.

Related codes in the G40 category

G40.0 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset Non-billable G40.1 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures Non-billable G40.2 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures Non-billable G40.3 Generalized idiopathic epilepsy and epileptic syndromes Non-billable G40.4 Other generalized epilepsy and epileptic syndromes Non-billable G40.5 Epileptic seizures related to external causes Non-billable G40.8 Other epilepsy and recurrent seizures Non-billable G40.00 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable Non-billable

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