G40.50 – Epileptic seizures related to external causes, not intractable

ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders

Non-billable header

ICD-10-CM code G40.50

Code: G40.50 (claims format: G4050)
Description: Epileptic seizures related to external causes, not intractable
Short description: Epileptic seizures related to external causes, not ntrct
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 6. Diseases of the nervous system (G00-G99)
Block: G40-G47 Episodic and paroxysmal disorders
Parent codes: G40 › G40.5

Billable codes under G40.50

G40.50 is a header code and cannot be used on claims. Choose the most specific code:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

G40 – Epilepsy and recurrent seizures

Excludes1 (not 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)

Notes:

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

G40.5 – Epileptic seizures related to external causes

Applicable to:

Epileptic seizures related to alcohol
Epileptic seizures related to drugs
Epileptic seizures related to hormonal changes
Epileptic seizures related to sleep deprivation
Epileptic seizures related to stress

Use additional code:

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Code also:

, if applicable, associated epilepsy and recurrent seizures (G40.-)

Frequently asked questions

What is ICD-10 code G40.50?

G40.50 is the ICD-10-CM code for epileptic seizures related to external causes, not intractable, in the block G40-G47 (Episodic and paroxysmal disorders).

Is G40.50 a billable code?

No. G40.50 is a header code with more specific child codes; report one of the billable codes listed above.

What category does G40.50 belong to?

It belongs to category G40 – Epilepsy and recurrent seizures.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.