CPT 1004T: Implanted Subscalp Continuous Bilateral EEG Technical Data Review

CPT code 1004T denotes a technical data review of implanted subscalp continuous bilateral electroencephalography (EEG) monitoring systems. This code captures provider time spent reviewing device-generated technical parameters — for example, contact groups, gain settings, and bandpass filters — without performing device reprogramming. Nationally, the code is relevant as implanted EEG monitoring grows for seizure management and neurodiagnostic surveillance, creating demand for defined billing pathways for remote technical reviews.

Key payers included in the review are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical and operational context for 1004T, typical sites of service where the workflow occurs, and what the code represents in care delivery. The publication summarizes how the code fits into service lines for neurology and device monitoring, highlights common billing considerations, and outlines where data is not available in the input. The intent is to provide clinicians, billing staff, and policy analysts with an understanding of the code’s purpose, applicability to implanted EEG systems, and the national payer landscape relevant to this service.

Billing Code Overview

CPT code 1004T describes review of technical data from an implanted subscalp continuous bilateral electroencephalography (EEG) monitoring system. The service involves analysis of technical parameters such as contact groups, gain, and bandpass filters without altering device programming. This is a remote/technical data review service focused on interpretation of device-generated signals rather than direct patient contact.

Typical site of service: Hospital outpatient department, ambulatory surgery center, or outpatient neurology clinic where implanted EEG monitoring devices are managed and remotely monitored.

Data not available in the input.

Clinical Context

A 34-year-old patient with medically refractory focal epilepsy has an implanted subscalp continuous bilateral electroencephalography (EEG) monitoring system placed to capture habitual events and guide long-term management. The device continuously records scalp EEG signals with multiple contact groups and transmits technical data to the treating neurologist. During routine follow-up, the clinician reviews the device's technical parameters including contact group integrity, amplification gain, and bandpass filter settings, and interprets the recorded tracings to correlate clinical events with electrographic activity. This review does not include reprogramming or altering implanted device settings. The workflow includes: device data upload via a secure server, clinician review of device technical logs and recorded EEG segments, documentation of findings and clinical interpretation in the medical record, and communication of results to the patient and referring team. Typical sites of service are outpatient neurology clinics, ambulatory surgery centers for device placement, and hospital outpatient departments for follow-up reviews when patients present for concurrent care. Typical clinical scenarios include routine post-implant surveillance, review after suspected seizure events, and preparation for multidisciplinary case discussion regarding anti-seizure medication adjustments or surgical candidacy assessment.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when only the physician interpretation/review portion is billed separate from technical services provided by another entity.

Taxonomy Code	Specialty	Notes
`207RH0000X`	Neurology	Neurologists commonly interpret EEG and review implanted EEG device data.
`2084N0400X`	Clinical Neurophysiology	Specialists in EEG monitoring and neurophysiologic testing perform and interpret device recordings.
`207L00000X`	Neurological Surgery	Neurosurgeons may be involved in device implantation and postoperative device data review in collaborative care.
`263M00000X`	Physician Assistant	PAs may assist in device management and data collection under physician supervision and document reviews.
`367H00000X`	Nurse Practitioner	NPs in neurology often participate in device follow-up and documentation of technical data review.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G40.909`	Epilepsy, unspecified, not intractable, without status epilepticus	Epilepsy diagnoses are primary indications for implantable EEG system monitoring to characterize seizure type and frequency.
`G40.311`	Localization-related (focal) (partial) epilepsy with simple partial seizures, intractable, with status epilepticus	Focal epilepsy with intractability often prompts invasive or implanted monitoring to localize seizure focus.
`G40.319`	Localization-related (focal) (partial) epilepsy with complex partial seizures, intractable, without status epilepticus	Used when implanted monitoring is intended to capture complex partial seizures for surgical planning.
`R56.9`	Unspecified convulsions	Captures patients with recurrent convulsive events where continuous EEG monitoring aids diagnosis.
`G41.909`	Status epilepticus, unspecified, without coma	Continuous EEG monitoring systems may be used for ongoing assessment in prolonged seizure disorders.
`Z45.2`	Encounter for adjustment and management of implanted electronic neurostimulator device	Coded for encounters focused on implanted neuro-device management and technical review, relevant to follow-up with `1004T`.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`1004T`	Review of technical data from implanted subscalp continuous bilateral EEG monitoring system; analysis of contact groups, gain, bandpass filters — physician review only, no device reprogramming	Primary code describing the physician review of technical EEG device data.
`95812`	Electroencephalogram (EEG); continuous EEG monitoring (eg, more than 24 hours) with video when performed	Alternative or complementary ambulatory/continuous EEG service used for extended scalp monitoring and correlation with events.
`95956`	Long-term monitoring (LTM) for epilepsy, including EEG recording and interpretation	Related long-term monitoring code when extended inpatient/outpatient LTM services are performed alongside implanted device data review.
`64595`	Percutaneous implantation of neurostimulator electrode array, intracranial; without insertion of neurostimulator pulse generator	Related to the implantation procedures for intracranial or subscalp monitoring systems; represents the implant placement phase in the workflow.
`99600`	Device evaluation (e.g., pacemaker, neurostimulator) including interrogation and review of saved data; physician analysis and interpretation only	Analogous code for device interrogation and review workflows; used as a conceptual comparator to `1004T` for billing processes.
`99091`	Collection and interpretation of physiologic data digitally stored and transmitted by the patient to the physician, requiring a minimum of 30 minutes of physician time	May be billed when substantial time is spent in review and interpretation of remotely transmitted physiologic data from monitoring devices, depending on payer policy.

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Summary & Overview