G40.3
Generalized idiopathic epilepsy and epileptic syndromes
G40.3 is a non-billable ICD-10-CM code header for generalized idiopathic epilepsy and epileptic syndromes. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are G40.30 Generalized idiopathic epilepsy and epileptic syndromes, not intractable and G40.31 Generalized idiopathic epilepsy and epileptic syndromes, intractable. Its coding notes include a Code also instruction, 5 Excludes1 entries and 12 Excludes2 entries.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
- MERRF syndrome, if applicable (E88.42)
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
- 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)
Notes
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled