ICD Code G40.509

ICD code G40.509 is epileptic seizures caused by external factors, not difficult to control (not intractable), and without a prolonged seizure episode (status epilepticus).

1. Patient presents with epileptic seizures.

2. Seizures are determined to be related to external causes (e.g., trauma, metabolic disturbances, toxins).

3. Seizures are not classified as intractable (i.e., they are controlled with treatment).

4. There is no evidence of status epilepticus (prolonged or repeated seizures without recovery).

5. Clinical evaluation and diagnostic testing support the absence of underlying chronic epilepsy or recurrent unprovoked seizures.

6. Documentation specifies the external factor contributing to the seizure event.

Relevant CPT codes that may be used to treat ICD code G40.509 include:

- 99202–99215 (Evaluation and Management services)

- 95816 (Electroencephalogram, awake and drowsy)

- 95819 (Electroencephalogram, including sleep)

- 95822 (Electroencephalogram, recording in coma or sleep only)

- 95951 (Monitoring for seizure detection, continuous and attended)

- 95953 (EEG monitoring, computer analysis)

- 96372 (Therapeutic, prophylactic, or diagnostic injection)

- 96365 (Intravenous infusion, initial, up to 1 hour)

These CPT codes are commonly associated with the management and treatment of G40.509.

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