Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 2 more specific codes instead:

G40.011 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus
G40.019 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

FY2012 Added to the draft code set draft Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from G40 Epilepsy and recurrent seizures

Excludes1 - never coded here

conversion disorder with seizures (F44.5)
convulsions NOS (R56.9)
post traumatic seizures (R56.1)
seizure (convulsive) NOS (R56.9)
seizure of newborn (P90)

Excludes2 - not included here

hippocampal sclerosis (G93.81)
mesial temporal sclerosis (G93.81)
temporal sclerosis (G93.81)
Todd's paralysis (G83.84)

Note

the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

State > confusional > acute
State > confusional > subacute
Disorder > major neurocognitive
Disorder > neurocognitive > major
Syndrome > brain > acute or subacute
Delirium, delirious > with > dementia
Reaction > organic, acute or subacute
Disorder > neurocognitive > major > in
Disorder > neurocognitive > major > in > with > violent behavior
Disorder > neurocognitive > major > in > with > combative behavior
Disorder > neurocognitive > major > in > with > aggressive behavior
Dementia > in > epilepsy
Dementia > in > epilepsy > with behavioral disturbance

Codes in the same group

Code	Description	Status
G40.00	Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable	Not billable

At a glance

Code: G40.01
System: ICD-10-CM
Status: Not billable
Valid: never billable
In the code set: FY2016 onwards
Part of: G40.0

Where this code sits

Chapter G00-G99 Diseases of the nervous system
Section G40-G47 Episodic and paroxysmal disorders
Category G40.0 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset
This code G40.01 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable

Source

ICD-10-CM FY2027 code set, published by the National Center for Health Statistics (NCHS).

Effective October 1, 2026.

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