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G40

Non-billable

Epilepsy and recurrent seizures

G40 is the ICD-10-CM code for Epilepsy and recurrent seizures. It is a non-billable category code — use a more specific child code such as G40.0 for billing.

Status
Header (non-billable)
Chapter
G00-G99
Subcodes
11
Edition
FY2026

G00-G99 Diseases of the nervous system

Excludes1 — not coded here

  • •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

  • •hippocampal sclerosis (G93.81)
  • •mesial temporal sclerosis (G93.81)
  • •temporal sclerosis (G93.81)
  • •Todd's paralysis (G83.84)

Notes

  • •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?
G40 is the ICD-10-CM code for "Epilepsy and recurrent seizures". It falls under G00-G99 Diseases of the nervous system.
Is G40 a billable code?
No — G40 is a non-billable header code. Use a more specific child code (such as G40.0) for billing.
What are the subcodes of G40?
G40 has 11 more specific child codes, including G40.0, G40.1, G40.2.
What is excluded from G40?
Excludes1 (not coded here): conversion disorder with seizures (F44.5); convulsions NOS (R56.9); post traumatic seizures (R56.1); seizure (convulsive) NOS (R56.9).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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