ICD-10-CM 2027 diagnosis code
G40.8Other epilepsy and recurrent seizures
G40.8 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About G40.8
G40.8 is the ICD-10-CM diagnosis code for other epilepsy and recurrent seizures. It belongs to category G40 (epilepsy and recurrent seizures), block G40-G47 (episodic and paroxysmal disorders) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.
Within G40, choose G40.8 (Other epilepsy and recurrent seizures) only when documentation doesn't support a more specific option: Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset (G40.0), Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures (G40.1), Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures (G40.2), generalized idiopathic epilepsy and epileptic syndromes (G40.3), other generalized epilepsy and epileptic syndromes (G40.4), epileptic seizures related to external causes (G40.5), epilepsy, unspecified (G40.9), absence epileptic syndrome (G40.A) and 2 more.
To report this condition, pick the subcode that matches the documentation: G40.80 (epilepsy), G40.81 (syndrome), G40.82 (spasms), G40.83 (syndrome), G40.84 (epilepsy) and G40.89 (seizures).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under G40.8
- G40.80Other epilepsy
- G40.81Lennox-Gastaut syndrome
- G40.811Lennox-Gastaut syndrome, not intractable, with status epilepticusBillable
- G40.812Lennox-Gastaut syndrome, not intractable, without status epilepticusBillable
- G40.813Lennox-Gastaut syndrome, intractable, with status epilepticusBillable
- G40.814Lennox-Gastaut syndrome, intractable, without status epilepticusBillable
- G40.82Epileptic spasms
- G40.83Dravet syndrome
- G40.84KCNQ2-related epilepsy
- G40.841KCNQ2-related epilepsy, not intractable, with status epilepticusBillable
- G40.842KCNQ2-related epilepsy, not intractable, without status epilepticusBillable
- G40.843KCNQ2-related epilepsy, intractable, with status epilepticusBillable
- G40.844KCNQ2-related epilepsy, intractable, without status epilepticusBillable
- G40.89Other seizuresBillable
Coding notes
- Epilepsies and epileptic syndromes undetermined as to whether they are focal or generalized
- Landau-Kleffner syndrome
Notes that apply from higher levels
Instructions written at a parent level also apply to G40.8.
› From G40 Epilepsy and recurrent seizures
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Broader instructions also apply from Chapter 6: Diseases of the nervous system.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about G40.8
Is G40.8 billable?
- No. G40.8 is a header code. Report one of its more specific subcodes instead.