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G40.9 ICD-10-CA subcategory: Epilepsy, unspecified

G40.9 isn’t a code on its own. Choose one of the 2 codes beneath it, the one the documentation supports.

Official description

G40.9

Epilepsy, unspecified

ICD-10-CA · Canada · Also written G409

Codes in G40.9

G40.9 isn’t a code on its own. Open the code that matches what the note documents.

G40.90Epilepsy, unspecified, not stated as intractableG40.91Epilepsy, unspecified, intractable

Notes for G40.9

As CIHI prints them, with any note G40.9 takes from the headings above it.

Includes

  • Epileptic:• convulsions NOS• fits NOS• seizures NOS

Use additional code

Add a code for this detail when the note documents it.

  • Use additional code to identify any associated condition(s) or cause.From G40 Epilepsy
  • Use additional code to identify any associated status epilepticus (G41.-)From G40 Epilepsy

Excludes

Conditions classified elsewhere.

  • Convulsion (convulsive) disorder (R56.80)convulsive seizure or fit NOS (R56.88)febrile convulsions (seizures) (R56.0-)
  • Conversion disorder with seizures (F44.5)convulsion NOS (R56.88)convulsions of newborn (P90)epileptic psychosis (F06.8)febrile convulsions (R56.0-)isolated (first) seizure (R56.88)Landau-Kleffner syndrome (F80.3)seizure (convulsive) NOS (R56.88)Todd's paralysis (postepileptic) (G83.8)From G40 Epilepsy
  • Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 6: Diseases of the nervous system (G00-G99)

Where G40.9 sits

  1. 1ChapterChapter 6: Diseases of the nervous system (G00-G99)
  2. 2Block G40-G47Episodic and paroxysmal disorders
  3. 3Category G40Epilepsy
  4. 4Subcategory G40.9Epilepsy, unspecified

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See G40.9 in the CIHI source

Frequently asked questions

Is G40.9 a valid ICD-10-CA code?

No. G40.9 (Epilepsy, unspecified) is a subcategory heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 2 codes; record the one the documentation supports.

Where is G40.9 in ICD-10-CA?

G40.9 sits under G40 Epilepsy, within G40-G47 Episodic and paroxysmal disorders, within Chapter 6: Diseases of the nervous system (G00-G99).

What coding notes apply to G40.9?

ICD-10-CA lists Includes, Excludes, Use additional code notes for G40.9, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside G40.9

G40.0Localization-related (focal)(partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onsetG40.1Localization-related (focal)(partial) symptomatic epilepsy and epileptic syndromes with simple partial seizuresG40.2Localization-related (focal)(partial) symptomatic epilepsy and epileptic syndromes with complex partial seizuresG40.3Generalized idiopathic epilepsy and epileptic syndromesG40.4Other generalized epilepsy and epileptic syndromesG40.5Special epileptic syndromesG40.6Grand mal seizures, unspecified (with or without petit mal)G40.7Petit mal, unspecified, without grand mal seizuresG40.8Other epilepsy