Summary & Overview
CPT 95708: Unmonitored Ambulatory EEG, 12–26 Hours
CPT code 95708 represents an unmonitored electroencephalography (EEG) study of 12 to 26 hours duration used to assess brain electrical activity when extended recording is needed but continuous video correlation is not performed. Nationally, prolonged EEG monitoring supports diagnosis and management of seizure disorders, unexplained altered mental status, and other paroxysmal neurological events, making accurate coding and billing important for clinical documentation and payment consistency. Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical service captured by the code, typical sites of service, common modifiers and billing considerations, and an overview of where 95708 fits among related EEG services. The publication also outlines typical billing practices and expected documentation elements needed to support claims. Data not available in the input is noted where applicable, and no state-specific rules are addressed; the content is framed for a national audience.
Billing Code Overview
CPT code 95708 describes an unmonitored electroencephalography (EEG) study lasting 12 to 26 hours. The service records the brain's electrical activity without concurrent video recording. An EEG technologist reviews the recorded data and prepares a technical description of the findings.
Service Type: Long-term ambulatory EEG monitoring (unmonitored)
Typical Site of Service: Outpatient facility or ambulatory EEG monitoring center
Clinical & Coding Specifications
Clinical Context
A 28-year-old ambulatory patient with a history of recurrent, unexplained episodes of altered consciousness and suspected epileptic seizures is referred for an ambulatory, unmonitored EEG. The study is ordered to capture interictal epileptiform discharges or ictal activity over an extended period when brief outpatient EEGs are nondiagnostic. An EEG technologist applies the standard 10–20 electrode system in the EEG lab or outpatient electrophysiology suite, instructs the patient on activity and event diary use, and then the patient leaves the facility for home monitoring. No synchronized video recording is performed. The technologist reviews the recorded electrical data after the monitoring period (12–26 hours), performs artifact annotation, and generates a technical report; interpretation may be performed later by the reading neurologist.
Typical site of service: outpatient EEG laboratory or ambulatory neurodiagnostic clinic.
Service type: unmonitored ambulatory electroencephalogram, technical component performed by EEG technologist, duration 12–26 hours, no video.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting the physician interpretation separate from the technical recording; applies if billing only the reading. |