G40.91 ICD-10-CA code: Epilepsy, unspecified, intractable
G40.91 is the ICD-10-CA code for “Epilepsy, unspecified, intractable” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
G40.91Epilepsy, unspecified, intractable
Short description: Epilepsy unspecified intr
ICD-10-CA · Canada · Also written G4091
Index terms
Entries in CIHI’s alphabetical index that lead to G40.91. Searching the index by the condition the note names is how coders reach this code.
- Fit, epileptic, intractable
- Morbus, caducus, intractable
- Morbus, comitialis, intractable
- Syndrome, epileptic, intractable
- Fugue, postictal in epilepsy, intractable
- Amnesia, postictal in epilepsy, intractable
- Dysrhythmia, cerebral or cortical, intractable
- Epilepsy, epileptic, epilepsia, fits, intractable
- Epilepsy, epileptic, epilepsia, seizure, intractable
- Epilepsy, epileptic, epilepsia, cerebral, intractable
- Epilepsy, epileptic, epilepsia, traumatic, intractable
- Epilepsy, epileptic, epilepsia, convulsions, intractable
Notes for G40.91
As CIHI prints them, with any note G40.91 takes from the headings above it.
Includes
- Epileptic:• convulsions NOS• fits NOS• seizures NOSFrom G40.9 Epilepsy, unspecified
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-)From G40.9 Epilepsy, unspecified
- 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 G40.91 sits
- 1ChapterChapter 6: Diseases of the nervous system (G00-G99)
- 2Block G40-G47Episodic and paroxysmal disorders
- 3Category G40Epilepsy
- 4Subcategory G40.9Epilepsy, unspecified
- 5Valid code G40.91Epilepsy, unspecified, intractable
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.
Frequently asked questions
What does ICD-10-CA code G40.91 mean?
G40.91 is the ICD-10-CA code for “Epilepsy, unspecified, intractable” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is G40.91 in ICD-10-CA?
G40.91 sits under G40.9 Epilepsy, unspecified, within G40 Epilepsy, within G40-G47 Episodic and paroxysmal disorders, within Chapter 6: Diseases of the nervous system (G00-G99).
What coding notes apply to G40.91?
ICD-10-CA lists Includes, Excludes, Use additional code notes for G40.91, 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.