ICDcodes.org
FY2027

G40.3 — Generalized idiopathic epilepsy and epileptic syndromes

Not billable

Is G40.3 billable?

No — G40.3 is a non-billable header code. G40.3 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath G40.3.

G40.3 at a glance

CodeG40.3
DescriptionGeneralized idiopathic epilepsy and epileptic syndromes
BillableNo — header code
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Code also

Two codes may be needed to describe the condition fully. Whether G40.3 is sequenced first depends on the reason for the encounter.

  • MERRF syndrome, if applicable (E88.42)

Excludes1 — never code together — inherited from G40

The conditions below can never be reported together with G40.3 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • 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 — inherited from Chapter 6

The conditions below are not part of G40.3, but a patient may have both at the same time. When documentation supports it, G40.3 and the excluded code may both be reported.

  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Excludes2 — not included here — inherited from G40

The conditions below are not part of G40.3, but a patient may have both at the same time. When documentation supports it, G40.3 and the excluded code may both be reported.

What codes fall under G40.3? (2)

How long has G40.3 existed?

G40.3 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

What other codes are in the G40 family? (10)