G40.4

Other generalized epilepsy and epileptic syndromes

Header / non-billable

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · G40.4
Synonyms

Epilepsy with grand mal seizures on awakening Epilepsy with myoclonic absences Epilepsy with myoclonic-astatic seizures Grand mal seizure NOS Nonspecific atonic epileptic seizures Nonspecific clonic epileptic seizures Nonspecific myoclonic epileptic seizures Nonspecific tonic epileptic seizures Nonspecific tonic-clonic epileptic seizures Symptomatic early myoclonic encephalopathy

Inherited from G40Epilepsy and recurrent seizures
Excludes 1

conversion disorder with seizures (F44.5) convulsions NOS (R56.9) post traumatic seizures (R56.1) seizure (convulsive) NOS (R56.9) seizure of newborn (P90)

Excludes 2

hippocampal sclerosis (G93.81) mesial temporal sclerosis (G93.81) temporal sclerosis (G93.81) Todd's paralysis (G83.84)

Note

the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

Inherited from chapter 6Diseases of the nervous system
Excludes 2

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)

Official Guidelines for G40.4

FY 2026 ›