G40.509: Epileptic seizures related to external causes, not intractable, without status epilepticus
G40.509 is a billable, specific ICD-10-CM code for epileptic seizures related to external causes, not intractable, without status epilepticus. It is valid for submission on a claim.
Check G40.509 with the rest of the claim: free scrubberInclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Epileptic seizures related to external causes, NOS
Excludes1 inherited from the categories above G40.509
A category’s note binds every code beneath it.
Excludes2 inherited from the categories above G40.509
Not part of this code, but both may be coded when both are present.
Other codes that can never be billed with G40.509
Their own Excludes1 notes name this code, so the conflict is not listed above.
Risk adjustment
G40.509 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 201 Seizure Disorders and Convulsions0.245 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score. Look up the whole chart to see which of its HCCs the hierarchy would zero.
Medicare coverage
G40.509 is named in 17 Medicare coverage policies: 17 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A56551Billing and Coding: Visual Fields Testing
- A56612Billing and Coding: CT of the Head
- A56619Billing and Coding: Nerve Conduction Studies and Electromyography
- A56631Billing and Coding: Thoracic Aortography and Carotid, Vertebral, and Subclavian Angiography
Alphabetic index entries that lead here
- Epilepsy, epileptic, epilepsia›related to›alcohol
- Epilepsy, epileptic, epilepsia›related to›drugs
- Epilepsy, epileptic, epilepsia›related to›external causes
- Epilepsy, epileptic, epilepsia›related to›hormonal changes
- Epilepsy, epileptic, epilepsia›related to›sleep deprivation
- Epilepsy, epileptic, epilepsia›related to›stress
- Epilepsy, epileptic, epilepsia›related to›alcohol›not intractable
- Epilepsy, epileptic, epilepsia›related to›drugs›not intractable
- Epilepsy, epileptic, epilepsia›related to›external causes›not intractable
- Epilepsy, epileptic, epilepsia›related to›hormonal changes›not intractable
- Epilepsy, epileptic, epilepsia›related to›sleep deprivation›not intractable
- Epilepsy, epileptic, epilepsia›related to›stress›not intractable
Code history
Unchanged in every release from FY2024 to FY2027.