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ICD-10-CM 2027

ICD-10 code for absence seizure

G40.A

Absence epileptic syndrome

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Seizure (s) › absence”. Page updated September 29, 2026.

About coding absence seizure

The ICD-10-CM code for absence seizure is G40.A (Absence epileptic syndrome).

Within G40 (epilepsy and recurrent seizures), G40.A is specifically for absence epileptic syndrome. Related codes cover 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), other epilepsy and recurrent seizures (G40.8), epilepsy, unspecified (G40.9) and 2 more.

To report this condition, pick the subcode that matches the documentation: G40.A0 (not intractable) and G40.A1 (intractable).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about absence seizure ICD-10 codes

What is the ICD-10 code for absence seizure?

G40.A — Absence epileptic syndrome (a header code; report a more specific subcode).

Is G40.A billable?

No. G40.A is a header code. Report one of its more specific subcodes instead.