2020 ICD-10-CM Diagnosis Code G40.509

Epileptic seizures related to external causes, not intractable, without status epilepticus

    2016 2017 2018 2019 2020 Billable/Specific Code
  • G40.509 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Epileptic seiz rel to extrn causes, not ntrct, w/o stat epi
  • The 2020 edition of ICD-10-CM G40.509 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G40.509 - other international versions of ICD-10 G40.509 may differ.
Applicable To
  • Epileptic seizures related to external causes, NOS
The following code(s) above G40.509 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G40.509:
  • G00-G99
    2020 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • 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)
    Diseases of the nervous system
  • G40
    ICD-10-CM Diagnosis Code G40

    Epilepsy and recurrent seizures

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Note
    • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
    Type 1 Excludes
    • conversion disorder with seizures (F44.5)
    • convulsions NOS (R56.9)
    • post traumatic seizures (R56.1)
    • seizure (convulsive) NOS (R56.9)
    • seizure of newborn (P90)
    Type 2 Excludes
    Epilepsy and recurrent seizures
  • G40.5
    ICD-10-CM Diagnosis Code G40.5

    Epileptic seizures related to external causes

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Epileptic seizures related to alcohol
    • Epileptic seizures related to drugs
    • Epileptic seizures related to hormonal changes
    • Epileptic seizures related to sleep deprivation
    • Epileptic seizures related to stress
    Code Also
    • , if applicable, associated epilepsy and recurrent seizures (G40.-)
    Use Additional
    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
    Epileptic seizures related to external causes
Approximate Synonyms
  • Epilepsia partialis continua
ICD-10-CM G40.509 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 023 Craniotomy with major device implant or acute complex cns pdx with mcc or chemotherapy implant or epilepsy with neurostimulator
  • 100 Seizures with mcc
  • 101 Seizures without mcc

Convert G40.509 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to G40.509:

ICD-10-CM Codes Adjacent To G40.509
G40.4 Other generalized epilepsy and epileptic syndromes
G40.40 Other generalized epilepsy and epileptic syndromes, not intractable
G40.401 …… with status epilepticus
G40.409 …… without status epilepticus
G40.41 Other generalized epilepsy and epileptic syndromes, intractable
G40.411 …… with status epilepticus
G40.419 …… without status epilepticus
G40.5 Epileptic seizures related to external causes
G40.50 Epileptic seizures related to external causes, not intractable
G40.501 …… with status epilepticus
G40.509 …… without status epilepticus
G40.8 Other epilepsy and recurrent seizures
G40.80 Other epilepsy
G40.801 …… not intractable, with status epilepticus
G40.802 …… not intractable, without status epilepticus
G40.803 …… intractable, with status epilepticus
G40.804 …… intractable, without status epilepticus
G40.81 Lennox-Gastaut syndrome
G40.811 …… not intractable, with status epilepticus
G40.812 …… not intractable, without status epilepticus
G40.813 …… intractable, with status epilepticus

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.