ICD-10 codes for Epilepsy
Epilepsy is coded primarily under G40, G40.909, G40.89 in the ICD-10-CM (Clinical Modification) classification. Top-level categories include G40 (Epilepsy and recurrent seizures); R56 (Convulsions, not elsewhere classified). The 2025 ICD-10-CM code set includes 100 codes related to epilepsy, of which 62 are billable (specific enough to appear on a medical claim).
Epilepsy and recurrent seizures are coded under G40 in ICD-10-CM, with subcodes for localization-related (focal) versus generalized epilepsy and for whether seizures are intractable and with or without status epilepticus. R56 covers convulsions that do not meet criteria for an epilepsy diagnosis.
Total Codes
100
Billable Codes
62
Categories
2
SNOMED CT Concepts
25+
Top 12 Relevant ICD-10 Codes
The codes most commonly assigned to epilepsy, ranked by primary-match status, billable status, and specificity. Tap a code to see its full ICD-10 detail page.
G40.89Other seizures
G40.909Epilepsy, unsp, not intractable, without status epilepticus
G40Epilepsy and recurrent seizures
R56Convulsions, not elsewhere classified
R56.1Post traumatic seizures
R56.9Unspecified convulsions
G40.42Cyclin-Dependent Kinase-Like 5 Deficiency Disorder
R56.00Simple febrile convulsions
R56.01Complex febrile convulsions
G40.001Local-rel idio epi w seiz of loc onst, not ntrct, w stat epi
G40.009Local-rel idio epi w seiz of loc onst,not ntrct,w/o stat epi
G40.011Local-rel idio epi w seiz of loc onset, ntrct, w stat epi
Primary Code Categories
These are the top-level ICD-10-CM categories for epilepsy. Click any code to see all specific subcodes within that group.
Billable / Specific Codes (62)
Specific ICD-10-CM codes that can be reported on medical claims for epilepsy.
G40.001Local-rel idio epi w seiz of loc onst, not ntrct, w stat epi
G40.009Local-rel idio epi w seiz of loc onst,not ntrct,w/o stat epi
G40.011Local-rel idio epi w seiz of loc onset, ntrct, w stat epi
G40.019Local-rel idio epi w seiz of loc onset, ntrct, w/o stat epi
G40.101Local-rel symptc epi w simp part seiz, not ntrct, w stat epi
G40.109Local-rel symptc epi w simp prt seiz,not ntrct, w/o stat epi
G40.111Local-rel symptc epi w simple part seiz, ntrct, w stat epi
G40.119Local-rel symptc epi w simple part seiz, ntrct, w/o stat epi
G40.201Local-rel symptc epi w cmplx prt seiz, not ntrct, w stat epi
G40.209Local-rel symptc epi w cmplx prt seiz,not ntrct,w/o stat epi
G40.211Local-rel symptc epi w cmplx partial seiz, ntrct, w stat epi
G40.219Local-rel symptc epi w cmplx part seiz, ntrct, w/o stat epi
G40.301Gen idiopathic epilepsy, not intractable, w stat epi
G40.309Gen idiopathic epilepsy, not intractable, w/o stat epi
G40.311Generalized idiopathic epilepsy, intractable, w stat epi
G40.319Generalized idiopathic epilepsy, intractable, w/o stat epi
G40.401Oth generalized epilepsy, not intractable, w stat epi
G40.409Oth generalized epilepsy, not intractable, w/o stat epi
G40.411Oth generalized epilepsy, intractable, w status epilepticus
G40.419Oth generalized epilepsy, intractable, w/o stat epi
G40.42Cyclin-Dependent Kinase-Like 5 Deficiency Disorder
G40.501Epileptic seiz rel to extrn causes, not ntrct, w stat epi
G40.509Epileptic seiz rel to extrn causes, not ntrct, w/o stat epi
G40.801Other epilepsy, not intractable, with status epilepticus
G40.802Other epilepsy, not intractable, without status epilepticus
G40.803Other epilepsy, intractable, with status epilepticus
G40.804Other epilepsy, intractable, without status epilepticus
G40.811Lennox-Gastaut syndrome, not intractable, w stat epi
G40.812Lennox-Gastaut syndrome, not intractable, w/o stat epi
G40.813Lennox-Gastaut syndrome, intractable, w status epilepticus
G40.814Lennox-Gastaut syndrome, intractable, w/o status epilepticus
G40.821Epileptic spasms, not intractable, with status epilepticus
G40.822Epileptic spasms, not intractable, w/o status epilepticus
G40.823Epileptic spasms, intractable, with status epilepticus
G40.824Epileptic spasms, intractable, without status epilepticus
G40.833Dravet syndrome, intractable, with status epilepticus
G40.834Dravet syndrome, intractable, without status epilepticus
G40.841KCNQ2-related epilepsy, not intractable, with stat epi
G40.842KCNQ2-related epilepsy, not intractable, without stat epi
G40.843KCNQ2-related epilepsy, intractable, with status epilepticus
G40.844KCNQ2-related epilepsy, intractable, without stat epi
G40.89Other seizures
G40.901Epilepsy, unsp, not intractable, with status epilepticus
G40.909Epilepsy, unsp, not intractable, without status epilepticus
G40.911Epilepsy, unspecified, intractable, with status epilepticus
G40.919Epilepsy, unsp, intractable, without status epilepticus
G40.A01Absence epileptic syndrome, not intractable, w stat epi
G40.A09Absence epileptic syndrome, not intractable, w/o stat epi
G40.A11Absence epileptic syndrome, intractable, w stat epi
G40.A19Absence epileptic syndrome, intractable, w/o stat epi
...and 12 more specific codes. Search all codes.
Cross-Mappings to Other Standards
ICD-10-CM codes for epilepsy link to several adjacent terminologies. These mappings are precomputed from official sources (NLM RxNav, UMLS Metathesaurus, SNOMED CT International) and served via AutoICD's reference and translate APIs.
SNOMED CT
25+ concepts mapped from this code group. Concept IDs include 1231737000, 1260117009, 1287669005, 1287670006, ....
Browse SNOMED CT directoryUMLS Metathesaurus
25+ CUIs indexed. Sample: C1719410, C0475521, C1396190, C2875074, ....
Browse UMLS directoryICD-11
ICD-11 (WHO 2022) classifies many of these conditions under different chapter and stem-code structures. Use the converter to see specific ICD-10 to ICD-11 mappings.
Open ICD-10 to ICD-11 converterFrequently Asked Questions
What is the ICD-10 code for epilepsy?
The primary ICD-10-CM codes for epilepsy are G40, G40.909, G40.89. Across all sub-categories, 100 codes are grouped under epilepsy, with 62 marked as billable (specific enough for a medical claim).
How many ICD-10 codes are there for epilepsy?
There are 100 ICD-10-CM codes related to epilepsy. Of these, 62 are billable specific codes and 38 are non-billable header categories that organize the specific codes underneath them. Header codes cannot be reported on a claim by themselves.
Is there a billable ICD-10 code for epilepsy?
Yes. 62 of the 100 ICD-10-CM codes for epilepsy are billable. Common examples include G40.001 (Local-rel idio epi w seiz of loc onst, not ntrct, w stat epi); G40.009 (Local-rel idio epi w seiz of loc onst,not ntrct,w/o stat epi); G40.011 (Local-rel idio epi w seiz of loc onset, ntrct, w stat epi). Code to the highest level of specificity supported by the documentation.
Which epilepsy ICD-10 code should I use for billing?
The most commonly used billable codes for epilepsy include: G40.001 (Local-rel idio epi w seiz of loc onst, not ntrct, w stat epi); G40.009 (Local-rel idio epi w seiz of loc onst,not ntrct,w/o stat epi); G40.011 (Local-rel idio epi w seiz of loc onset, ntrct, w stat epi). The correct code depends on the documented clinical presentation, including any complications, episode (acute / chronic), and laterality where applicable. Always code to the highest level of specificity supported by the clinical documentation.
Is G40 a billable ICD-10 code?
No, G40 (Epilepsy and recurrent seizures) is a non-billable header code. You need to use a more specific child code for billing purposes.
What are the SNOMED CT concepts for epilepsy?
The ICD-10 codes for epilepsy map to at least 25 SNOMED CT concepts. Examples of SNOMED CT concept IDs in this group include 1231737000, 1260117009, 1287669005, 1287670006, 1287671005. SNOMED CT is a clinical terminology used in electronic health records; AutoICD's coding API returns SNOMED CT IDs alongside each ICD-10 code via the include_snomed=true flag.
What UMLS Concept Unique Identifiers (CUIs) cover epilepsy?
The ICD-10 codes for epilepsy are linked to at least 25 UMLS CUIs in the National Library of Medicine's Metathesaurus. Sample CUIs include C1719410, C0475521, C1396190, C2875074, C2875075. UMLS CUIs unify the same concept across SNOMED CT, ICD-10, ICD-11, RxNorm, MeSH, and dozens of other source vocabularies.
What are other names for epilepsy in ICD-10?
Epilepsy may also be referred to as: epilepsy, seizure disorder, tonic-clonic seizures, focal epilepsy, absence seizures. The same ICD-10-CM codes apply regardless of which term appears in the clinical documentation. Synonyms are surfaced by AutoICD's NER pass and mapped to the canonical ICD-10 family above.
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