ICD-10-CM
ICD-10 code for Epilepsy: G40.909
The ICD-10-CM index points "Epilepsy" to G40.909, Epilepsy, unspecified, not intractable, without status epilepticus. G40.909 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- B69.0cysticercosis, Cysticercosis of central nervous systemBillable
- F06.8deterioration (mental), Other specified mental disorders due to known physiological conditionBillable
- A52.19due to syphilis, Other symptomatic neurosyphilisBillable
- G40.919intractable, Epilepsy, unspecified, intractable, without status epilepticusBillable
- G40.A09juvenile absence, Absence epileptic syndrome, not intractable, without status epilepticusBillable
- G40.B09juvenile myoclonic, Juvenile myoclonic epilepsy, not intractable, without status epilepticusBillable
- G40.842KCNQ2-related, KCNQ2-related epilepsy, not intractable, without status epilepticusBillable
- G40.C09Lafora progressive myoclonus, Lafora progressive myoclonus epilepsy, not intractable, without status epilepticusBillable
- G40.909not intractable, Epilepsy, unspecified, not intractable, without status epilepticusBillable
- B71.9parasitic NOS, Cestode infection, unspecified, and G94 for the manifestationBillable
- G40.822spasms, Epileptic spasms, not intractable, without status epilepticusBillable
- G40.802specified NEC, Other epilepsy, not intractable, without status epilepticusBillable
- F05twilight, Delirium due to known physiological conditionBillable
More specific codes in G40
A header groups codes and is not billed. A billable code is one you can report.
- G40Epilepsy and recurrent seizuresHeader
- G40.0Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onsetHeader
- G40.00Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractableHeader
- G40.01Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractableHeader
- G40.1Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizuresHeader
- G40.10Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractableHeader
- G40.11Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractableHeader
- G40.2Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizuresHeader
- G40.20Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractableHeader
- G40.21Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractableHeader
- G40.3Generalized idiopathic epilepsy and epileptic syndromesHeader
- G40.30Generalized idiopathic epilepsy and epileptic syndromes, not intractableHeader
- G40.31Generalized idiopathic epilepsy and epileptic syndromes, intractableHeader
- G40.4Other generalized epilepsy and epileptic syndromesHeader
- G40.40Other generalized epilepsy and epileptic syndromes, not intractableHeader
- G40.41Other generalized epilepsy and epileptic syndromes, intractableHeader
- G40.42Cyclin-Dependent Kinase-Like 5 Deficiency DisorderBillable
- G40.5Epileptic seizures related to external causesHeader
- G40.50Epileptic seizures related to external causes, not intractableHeader
- G40.8Other epilepsy and recurrent seizuresHeader
- G40.80Other epilepsyHeader
- G40.81Lennox-Gastaut syndromeHeader
- G40.82Epileptic spasmsHeader
- G40.83Dravet syndromeHeader
- G40.84KCNQ2-related epilepsyHeader
- G40.89Other seizuresBillable
- G40.9Epilepsy, unspecifiedHeader
- G40.90Epilepsy, unspecified, not intractableHeader
- G40.91Epilepsy, unspecified, intractableHeader
- G40.AAbsence epileptic syndromeHeader
- G40.A0Absence epileptic syndrome, not intractableHeader
- G40.A1Absence epileptic syndrome, intractableHeader
- G40.BJuvenile myoclonic epilepsy [impulsive petit mal]Header
- G40.B0Juvenile myoclonic epilepsy, not intractableHeader
- G40.B1Juvenile myoclonic epilepsy, intractableHeader
- G40.CLafora progressive myoclonus epilepsyHeader
- G40.C0Lafora progressive myoclonus epilepsy, not intractableHeader
- G40.C1Lafora progressive myoclonus epilepsy, intractableHeader
Excludes1
Excludes1 means these codes are not reported together.
From G40. A note on a category applies to every code under it.
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From G40. A note on a category applies to every code under it.
Related conditions
Related pages
- G40.909 code detailsNotes, nearby codes, CMS-HCC group
- Category G40Every code under it
- Chapter 6Diseases of the nervous system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Epilepsy?
The ICD-10-CM index points "Epilepsy" to G40.909, Epilepsy, unspecified, not intractable, without status epilepticus. G40.909 is a billable code.
Is G40.909 billable?
Yes. G40.909 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to G40.909?
The CDC tabular list gives 5 Excludes1 notes (not coded together), 4 Excludes2 notes (may be coded together when both are documented) for G40.909 and the categories above it. They are listed on this page.
What chapter is G40.909 in?
Chapter 6. Diseases of the nervous system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.