Skip to content
Dx

ICD-10-CM 2027

ICD-10 code for epilepsy myoclonus

G40.4

Other generalized epilepsy and epileptic syndromes

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Myoclonus, myoclonic, myoclonia (familial) (essential) (multifocal) (simplex) › epilepsy”. Page updated September 29, 2026.

About coding epilepsy myoclonus

The ICD-10-CM code for epilepsy myoclonus is G40.4 (Other generalized epilepsy and epileptic syndromes).

Within G40, choose G40.4 (Other generalized epilepsy and epileptic syndromes) 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), epileptic seizures related to external causes (G40.5), other epilepsy and recurrent seizures (G40.8), epilepsy, unspecified (G40.9), absence epileptic syndrome (G40.A) and 2 more.

To report this condition, pick the subcode that matches the documentation: G40.40 (not intractable), G40.41 (intractable) and G40.42 (disorder).

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

More specific epilepsy myoclonus codes (official index)

  • familial (progressive)
  • Lafora

Common questions about epilepsy myoclonus ICD-10 codes

What is the ICD-10 code for epilepsy myoclonus?

G40.4 — Other generalized epilepsy and epileptic syndromes (a header code; report a more specific subcode).

Is G40.4 billable?

No. G40.4 is a header code. Report one of its more specific subcodes instead.