G40.309

Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC V28

HCC201

Seizure Disorders and Convulsions

CMS-HCC ESRD V24

HCC79

Seizure Disorders and Convulsions

RxHCC V08

RXHCC164

Epilepsy and Other Seizure Disorders, Except Intractable Epilepsy

Coding notes

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

This code · G40.309

Synonyms

Generalized idiopathic epilepsy and epileptic syndromes NOS

Inherited from G40.30Generalized idiopathic epilepsy, not intractable

Synonyms

Generalized idiopathic epilepsy and epileptic syndromes without intractability

Inherited from G40.3Generalized idiopathic epilepsy and epileptic syndromes

Code also

MERRF syndrome, if applicable (E88.42)

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 G40.309

FY 2026 ›

I.C.6Chapter-specific guidanceChapter 6: Diseases of the Nervous System (G00-G99)

Subsections

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