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CPT 95705: Unmonitored EEG, 2–12 Hours

CPT code 95705 represents an unmonitored electroencephalography study of the brain lasting 2 to 12 hours without video recording. This technical EEG service captures prolonged electrical activity and includes technologist review and a technical description. Nationally, prolonged EEG services support diagnosis and management of seizure disorders, altered mental status, and other neurologic conditions where extended electrical monitoring is clinically informative.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of coding definitions, typical sites of service, and common modifiers associated with prolonged EEG studies. The publication summarizes payer coverage patterns and billing considerations, presents benchmark context for utilization and reimbursement, and outlines clinical scenarios where a 2-to-12 hour unmonitored EEG is commonly used.

The content is intended for coding professionals, billing managers, and clinicians involved in neurodiagnostic services. It emphasizes coding clarity, common administrative modifiers, and the clinical utility of extended EEG monitoring, helping stakeholders align documentation and billing practices with payer expectations. Data not available in the input for specific payor policies, ICD-10 pairings, and taxonomies is noted where applicable.

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Billing Code Overview

CPT code 95705 describes an unmonitored electroencephalography (EEG) study lasting 2 to 12 hours. The service captures recording of the brain's electrical activity without simultaneous video recording. An EEG technologist reviews the recorded data and provides a technical description of the findings.

Service type: Extended EEG monitoring (technical component)

Typical site of service: Ambulatory EEG lab or outpatient neurodiagnostic facility, where patients undergo prolonged EEG recording without video supervision.

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CPT 95705: Unmonitored EEG, 2–12 Hours

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Billing Code Overview

Service type: Extended EEG monitoring (technical component)

Typical site of service: Ambulatory EEG lab or outpatient neurodiagnostic facility, where patients undergo prolonged EEG recording without video supervision.

Clinical & Coding Specifications

Clinical Context

A typical patient for 95705 is an adolescent or adult evaluated for suspected focal epilepsy, unexplained spells, or altered consciousness in an outpatient or ambulatory EEG laboratory. The patient arrives for an unmonitored long-term EEG recording that will last between two and twelve hours. An EEG technologist applies scalp electrodes per the international 10–20 system, confirms signal quality, and instructs the patient on activity restrictions (sleep deprivation or normal sleep allowed, no video is recorded). The patient may undergo standardized activation procedures (hyperventilation, photic stimulation) or be allowed to sleep naturally; no continuous physician monitoring or simultaneous video capture is performed. The technologist records and stores the raw digital EEG data, performs routine checks during the study, and prepares a technical report describing electrode placement, recording duration, significant electrographic events, and technical artifacts. A neurologist or epileptologist later reviews the recording and issues an interpretation and clinical report (professional component). Typical sites of service include hospital outpatient EEG labs, ambulatory EEG centers, and some freestanding neurology clinics. Common clinical indications include new-onset seizures, breakthrough seizures despite therapy, transient loss of consciousness, or evaluation of altered mental status.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician interpretation of the EEG separate from the technical recording.
`TC`	Technical component	Use when billing only the technical services (EEG technologist recording and equipment) for `95705`.
`59`	Distinct procedural service	Use when `95705` is performed on the same day as another distinct EEG or neurophysiology procedure that is not typically billed together, and appropriate documentation supports distinct services.
`52`	Reduced services	Use when the study is shortened or limited (e.g., aborted early) and documentation supports reduced service time/extent.
`53`	Discontinued procedure	Use when the EEG is started but discontinued due to patient intolerance or an acute event preventing completion.
`22`	Unusual procedural services	Use when the EEG requires substantially greater resources or atypical effort beyond the usual for `95705` (rare for standard ambulatory EEGs).
`23`	Unusual anesthesia	Not commonly used for `95705`; include only if unusual anesthesia is required and separately reportable.
`59`	Distinct procedural service	Duplicate entry avoided in practice; listed here once as above.
`76`	Repeat procedure by same provider	Not in input list; not included.
`78`	Return to the operating/procedure room after initial procedure	Use only if patient requires return for placement correction or repeat recording under same anesthesia (rare).
`80`	Assistant surgeon	Not applicable for `95705` (surgical assistant modifiers typically not used).

Taxonomy Code	Specialty	Notes
`2084P0800X`	Neurology	Neurologists and epileptologists interpret EEGs and provide the professional component.
`246Y00000X`	Clinical Neurophysiology	Specialists who perform and interpret advanced EEG and neurophysiology testing.
`125Q00000X`	Electroneurodiagnostic (END) Technologist	EEG technologists perform electrode application, recording, and technical reporting.
`261QP2300X`	Hosp/Clinic EEG Lab	Facility-based providers who manage ambulatory EEG services.

Note: From the provided modifier list, the table focuses on the most clinically relevant modifiers for 95705. Only common, applicable taxonomy specialties are listed based on clinical practice.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G40.909`	Epilepsy, unspecified, not intractable, without status epilepticus	Common indication for ambulatory long-term EEG to characterize seizure activity or guide therapy.
`G40.811`	Localization-related (focal) epilepsy with simple partial seizures, intractable, without status epilepticus	Focal epilepsy is frequently evaluated with prolonged EEG to detect interictal or ictal discharges.
`R55`	Syncope and collapse	Used when transient loss of consciousness is unexplained and EEG is needed to distinguish seizure from syncope.
`G93.40`	Encephalopathy, unspecified	Patients with altered mental status may undergo prolonged EEG to assess for nonconvulsive seizures or diffuse slowing.
`F44.5`	Conversion disorder with seizures or convulsions	Prolonged EEG can help differentiate psychogenic non-epileptic events from epileptic seizures.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95951`	Recording of sleep, ventilatory and oxygenation parameters during polysomnography; attended by a technologist	Often performed when there is concern for sleep-related events that may require simultaneous respiratory monitoring; may be ordered separately or instead of prolonged EEG.
`95816`	EEG during wakefulness and sleep, routine, with hyperventilation and photic stimulation (30 minutes)	A shorter routine EEG often performed before or instead of a long-term unmonitored study when brief recording is adequate for diagnosis.
`95812`	EEG, awake and drowsy, tracing only, without interpretation and report (routine)	Technical-only routine EEG when facility bills the technical component; may be used when `95705` is not indicated or for shorter recordings.
`95925`	EEG monitoring for seizure localization (intracranial)	An advanced monitoring code for invasive or intensive localization that is a higher-complexity follow-up when noninvasive ambulatory EEG (`95705`) is insufficient.
`95822`	Electroencephalogram during sleep, neonatal or pediatric — routine	Pediatric-specific EEGs that may be used in children when sleep-focused recording is required; serves similar clinical purposes in pediatric workflows.

CPT 95706: Extended EEG Monitoring, 2–12 Hours

CPT-95707-EXTENDED-EEG-MONITORING-2-TO-12-HOURS

CPT 95707: Extended Electroencephalography Monitoring, 2–12 Hours

CPT-95708-UNMONITORED-AMBULATORY-EEG-12-26-HOURS

CPT 95708: Unmonitored Ambulatory EEG, 12–26 Hours

CPT-95709-PROLONGED-AMBULATORY-EEG-12-TO-26-HOURS

CPT 95709: Prolonged Ambulatory EEG, 12–26 Hours

CPT-95710-CONTINUOUS-EEG-MONITORING-NO-VIDEO

CPT 95710: Continuous Electroencephalography Monitoring Without Video

CPT-95711-UNMONITORED-EEG-2-TO-12-HOUR-VIDEO-TECHNICAL-REVIEW

CPT 95711: Unmonitored EEG with Video, 2–12 Hours

CPT-95712-EXTENDED-VIDEO-EEG-2-12-HOUR-MONITORING

CPT 95712: Extended Video Electroencephalography, 2–12 Hours

CPT-95713-PROLONGED-EEG-WITH-VIDEO-2-TO-12-HOURS

CPT 95713: Prolonged EEG with Video, 2–12 Hours

CPT-95714-UNMONITORED-EEG-12-TO-26-HOURS-WITH-VIDEO

CPT 95714: Unmonitored EEG, 12–26 Hours with Video

CPT-95715-PROLONGED-VIDEO-EEG-12-26-HOURS

CPT 95715: Prolonged Video EEG Monitoring, 12–26 Hours

Showing 1–10 of 29

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

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Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician interpretation of the EEG separate from the technical recording.
`TC`	Technical component	Use when billing only the technical services (EEG technologist recording and equipment) for `95705`.
`59`	Distinct procedural service	Use when `95705` is performed on the same day as another distinct EEG or neurophysiology procedure that is not typically billed together, and appropriate documentation supports distinct services.
`52`	Reduced services	Use when the study is shortened or limited (e.g., aborted early) and documentation supports reduced service time/extent.
`53`	Discontinued procedure	Use when the EEG is started but discontinued due to patient intolerance or an acute event preventing completion.
`22`	Unusual procedural services	Use when the EEG requires substantially greater resources or atypical effort beyond the usual for `95705` (rare for standard ambulatory EEGs).
`23`	Unusual anesthesia	Not commonly used for `95705`; include only if unusual anesthesia is required and separately reportable.
`59`	Distinct procedural service	Duplicate entry avoided in practice; listed here once as above.
`76`	Repeat procedure by same provider	Not in input list; not included.
`78`	Return to the operating/procedure room after initial procedure	Use only if patient requires return for placement correction or repeat recording under same anesthesia (rare).
`80`	Assistant surgeon	Not applicable for `95705` (surgical assistant modifiers typically not used).

Taxonomy Code	Specialty	Notes
`2084P0800X`	Neurology	Neurologists and epileptologists interpret EEGs and provide the professional component.
`246Y00000X`	Clinical Neurophysiology	Specialists who perform and interpret advanced EEG and neurophysiology testing.
`125Q00000X`	Electroneurodiagnostic (END) Technologist	EEG technologists perform electrode application, recording, and technical reporting.
`261QP2300X`	Hosp/Clinic EEG Lab	Facility-based providers who manage ambulatory EEG services.

Note: From the provided modifier list, the table focuses on the most clinically relevant modifiers for 95705. Only common, applicable taxonomy specialties are listed based on clinical practice.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G40.909`	Epilepsy, unspecified, not intractable, without status epilepticus	Common indication for ambulatory long-term EEG to characterize seizure activity or guide therapy.
`G40.811`	Localization-related (focal) epilepsy with simple partial seizures, intractable, without status epilepticus	Focal epilepsy is frequently evaluated with prolonged EEG to detect interictal or ictal discharges.
`R55`	Syncope and collapse	Used when transient loss of consciousness is unexplained and EEG is needed to distinguish seizure from syncope.
`G93.40`	Encephalopathy, unspecified	Patients with altered mental status may undergo prolonged EEG to assess for nonconvulsive seizures or diffuse slowing.
`F44.5`	Conversion disorder with seizures or convulsions	Prolonged EEG can help differentiate psychogenic non-epileptic events from epileptic seizures.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95951`	Recording of sleep, ventilatory and oxygenation parameters during polysomnography; attended by a technologist	Often performed when there is concern for sleep-related events that may require simultaneous respiratory monitoring; may be ordered separately or instead of prolonged EEG.
`95816`	EEG during wakefulness and sleep, routine, with hyperventilation and photic stimulation (30 minutes)	A shorter routine EEG often performed before or instead of a long-term unmonitored study when brief recording is adequate for diagnosis.
`95812`	EEG, awake and drowsy, tracing only, without interpretation and report (routine)	Technical-only routine EEG when facility bills the technical component; may be used when `95705` is not indicated or for shorter recordings.
`95925`	EEG monitoring for seizure localization (intracranial)	An advanced monitoring code for invasive or intensive localization that is a higher-complexity follow-up when noninvasive ambulatory EEG (`95705`) is insufficient.
`95822`	Electroencephalogram during sleep, neonatal or pediatric — routine	Pediatric-specific EEGs that may be used in children when sleep-focused recording is required; serves similar clinical purposes in pediatric workflows.

CPT 95706: Extended EEG Monitoring, 2–12 Hours

CPT-95707-EXTENDED-EEG-MONITORING-2-TO-12-HOURS

CPT 95707: Extended Electroencephalography Monitoring, 2–12 Hours

CPT-95708-UNMONITORED-AMBULATORY-EEG-12-26-HOURS

CPT 95708: Unmonitored Ambulatory EEG, 12–26 Hours

CPT-95709-PROLONGED-AMBULATORY-EEG-12-TO-26-HOURS

CPT 95709: Prolonged Ambulatory EEG, 12–26 Hours

CPT-95710-CONTINUOUS-EEG-MONITORING-NO-VIDEO

CPT 95710: Continuous Electroencephalography Monitoring Without Video

CPT-95711-UNMONITORED-EEG-2-TO-12-HOUR-VIDEO-TECHNICAL-REVIEW

CPT 95711: Unmonitored EEG with Video, 2–12 Hours

CPT-95712-EXTENDED-VIDEO-EEG-2-12-HOUR-MONITORING

CPT 95712: Extended Video Electroencephalography, 2–12 Hours

CPT-95713-PROLONGED-EEG-WITH-VIDEO-2-TO-12-HOURS

CPT 95713: Prolonged EEG with Video, 2–12 Hours

CPT-95714-UNMONITORED-EEG-12-TO-26-HOURS-WITH-VIDEO

CPT 95714: Unmonitored EEG, 12–26 Hours with Video

CPT-95715-PROLONGED-VIDEO-EEG-12-26-HOURS

CPT 95715: Prolonged Video EEG Monitoring, 12–26 Hours

Showing 1–10 of 29

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

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CPT 95705: Unmonitored EEG, 2–12 Hours

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Billing Code Overview

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CPT 95705: Unmonitored EEG, 2–12 Hours

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References