Summary & Overview

CPT 0959T: Removal or Replacement of Magnet from Subscalp Continuous Bilateral EEG Coil

CPT code 0959T covers the removal or replacement of a magnet from the coil assembly of a subscalp continuous bilateral electroencephalography (EEG) monitoring system, including any imaging guidance required. As the use of subscalp continuous EEG devices expands for long-term monitoring in epilepsy and other neurologic conditions, this code provides a specific pathway to report targeted device maintenance or minor procedural interventions on implanted monitoring hardware. Nationally, clear coding for device-related procedures affects billing accuracy, device lifecycle management, and alignment between clinical care and reimbursement.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and service setting, typical billing considerations tied to device maintenance procedures, and pointers to where one would look for payer-specific coverage and payment policies. The publication highlights benchmarks and policy updates where available and identifies gaps where data is not provided. This summary is intended to inform coding professionals, hospital billing teams, and clinical program managers responsible for long-term EEG monitoring services about the intent and scope of CPT code 0959T and the operational contexts in which it is reported.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare0959TCPTEEGsubscalp-monitoringdevice-maintenanceimaging-guidanceambulatory-surgeryhospital-outpatient

Billing Code Overview

CPT code 0959T describes the removal or replacement of a magnet from the coil assembly of a subscalp continuous bilateral electroencephalography (EEG) monitoring system. The code includes any imaging guidance required for the procedure.

Service type: Device maintenance/removal or minor surgical procedure on a subscalp implanted monitoring system
Typical site of service: Ambulatory surgical center or hospital outpatient department

Clinical & Coding Specifications

Clinical Context

A 28-year-old patient with drug-resistant focal epilepsy undergoes placement of a subscalp continuous bilateral electroencephalography (EEG) monitoring system for prolonged ambulatory EEG recording to capture habitual events. After several weeks of monitoring the external magnet in the coil assembly is found to be malfunctioning or needs exchange to ensure proper device function. In the outpatient procedural suite, under sterile conditions and with fluoroscopic or ultrasound imaging guidance, the neurology or neurosurgery provider removes the defective magnet from the coil assembly and replaces it with a functioning magnet. The procedure is brief, typically performed under local anesthesia with monitored sedation available if needed, and includes imaging guidance as part of the service. Post-procedure, the patient is observed for a short recovery period and the device is tested to confirm proper signal transmission before discharge with follow-up arranged for device checks and continued EEG monitoring.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work required to remove/replace the magnet is substantially greater than typical and documentation supports the increased complexity or time.
`50`

Taxonomy Code	Specialty	Notes
2084S0005X	Neurology	Neurologists specializing in epilepsy commonly manage EEG monitoring systems and perform device adjustments or exchanges.
2086P0800X	Neurosurgery	Neurosurgeons manage implanted subscalp hardware and perform device-related surgical interventions.
207RC0000X	Physical Medicine & Rehabilitation	PM&R physicians with implantable device expertise may be involved in device management in some centers.
2080P0002X	Clinical Neurophysiology	Specialists in clinical neurophysiology interpret EEGs and may participate in device troubleshooting and procedures.

ICD-10 Code	Description	Clinical Relevance
`G40.901`	Epilepsy, unspecified, not intractable, with status epilepticus	Epilepsy-related indications for long-term subscalp EEG monitoring to capture seizure activity and evaluate control.
`G40.909`	Epilepsy, unspecified, not intractable, without status epilepticus	Common diagnosis prompting ambulatory EEG monitoring via implanted subscalp systems to evaluate seizure type and frequency.
`G40.211`	Localization-related (focal) epilepsy, intractable, with status epilepticus	Patients with drug-resistant focal epilepsy often receive long-term monitoring systems; magnet maintenance may be required during monitoring.
`G40.219`	Localization-related (focal) epilepsy, intractable, without status epilepticus	Typical indication for prolonged ambulatory EEG using subscalp systems to localize seizure focus prior to surgical planning.
`R56.9`	Unspecified convulsions	Convulsions or undiagnosed seizure-like events prompting diagnostic prolonged EEG monitoring with subscalp systems.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95950`	Continuous intraoperative neurophysiological monitoring, from outside company providing technologist/physician services, per hour (List separately in addition to code for primary procedure)	May be used when continuous EEG monitoring services are provided concurrently or to bill monitoring time associated with implantable EEG systems in some settings.
`95812`	Electroencephalogram (EEG) with video monitoring, continuous 24 hours or more; without interpretation and report	Represents prolonged EEG recording services that the subscalp system is intended to provide; used for the monitoring portion of care.
`95970`	Electronic analysis of implanted neurostimulator pulse generator/transmitter, with programming; first hour	Though for neurostimulator devices, this code is related in workflow when device interrogation/programming is required after magnet replacement to confirm function.
`99070`	Supplies and materials (except spectacles), provided by the physician over and above those usually included with the office visit or procedure	Used to report special supplies or replacement parts associated with the magnet or coil assembly when payors permit separate supply billing.
`99024`	Postoperative follow-up visit, included in global service, unrelated to complications (used for hospitals reporting)	Relevant to documenting routine device checks and follow-up after magnet replacement; billing depends on global period policies.

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