ICD-10 Code for Seizure

Also indexed as (s)

The ICD-10-CM code for seizure is R56.9 — Unspecified convulsions. This is the code the Alphabetic Index gives for seizure with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).

BillableUnspecified

R56.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.

Which seizure code should you use?

The Alphabetic Index lists 22 codes under Seizure. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.

By type

absence	G40.A	Absence epileptic syndrome	not billable
autonomic	F44.5	Conversion disorder with seizures or convulsions
disorder	G40.909	Epilepsy, unspecified, not intractable, without status epilepticus
febrile	R56.00	Simple febrile convulsions
grand mal	G40.409	Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus
hysterical	F44.5	Conversion disorder with seizures or convulsions
intractable	G40.919	Epilepsy, unspecified, intractable, without status epilepticus
newborn	P90	Convulsions of newborn
petit mal	G40.A	Absence epileptic syndrome	not billable
post traumatic	R56.1	Post traumatic seizures
recurrent	G40.909	Epilepsy, unspecified, not intractable, without status epilepticus
specified NEC	G40.89	Other seizures

Seizure febrile

with status epilepticus	G40.901	Epilepsy, unspecified, not intractable, with status epilepticus
complex	R56.01	Complex febrile convulsions
complex › with status epilepticus	G40.901	Epilepsy, unspecified, not intractable, with status epilepticus

Seizure grand mal

intractable	G40.419	Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus
not intractable	G40.409	Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus
intractable › with status epilepticus	G40.411	Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus
intractable › without status epilepticus	G40.419	Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus
not intractable › with status epilepticus	G40.401	Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus
not intractable › without status epilepticus	G40.409	Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus

Seizure intractable

with status epilepticus

G40.911

Epilepsy, unspecified, intractable, with status epilepticus

Seizure petit mal

intractable	G40.A1	Absence epileptic syndrome, intractable	not billable
not intractable	G40.A0	Absence epileptic syndrome, not intractable	not billable
intractable › with status epilepticus	G40.A11	Absence epileptic syndrome, intractable, with status epilepticus
intractable › without status epilepticus	G40.A19	Absence epileptic syndrome, intractable, without status epilepticus
not intractable › with status epilepticus	G40.A01	Absence epileptic syndrome, not intractable, with status epilepticus
not intractable › without status epilepticus	G40.A09	Absence epileptic syndrome, not intractable, without status epilepticus

Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources