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    OpenPayerBilling CodesSub-Scalp Bilateral Electroencephalography Analysis and Monitoring ProceduresCPT cpt-1004t-implanted-subscalp-continuous-bilateral-eeg-technical-review
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    CPT 1004T: Implanted Subscalp Continuous Bilateral EEG Data Review

    CPT code 1004T describes review of technical data from an implanted subscalp continuous bilateral electroencephalography (EEG) monitoring system, documenting analysis of device telemetry such as contact groups, gain, and bandpass filter settings without changing device programming; service type: remote device data review/interpretation; typical site of service: outpatient or ambulatory neurology clinic or remote monitoring center.

    For related coverage guidance, see recent payer policy updates: Navigated Transcranial Magnetic Stimulation for Preoperative Brain Mapping, Navigated Transcranial Magnetic Stimulation for Preoperative Brain Mapping, Navigated Transcranial Magnetic Stimulation for Preoperative Brain Mapping.

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    Clinical & Coding Specifications

    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.

    Related CPT Codes

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

    Related Modifiers

    5 rows

    ModifierDescriptionWhen to Use
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    25CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
    79Modifier 79 indicates a surgical procedure performed during the postoperative global period of a prior surgery that is unrelated to the original procedure. Per AMA/CPT and CMS guidance, it is…- Use modifier 79 when the same physician (or same‑specialty physician in the same group) performs a surgical procedure during the postoperative global period of a prior surgery and the new procedure…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RH0000X
    2084N0400X
    207L00000X
    367H00000X
    261QS1000X
    163WP0200X
    213ER0200X
    3747A0650X

    Related Payer Policy Updates

    Specialty: Neurology/Neurosurgery1 / 3

    10 rows

    PolicyPayerEffective Date
    Navigated Transcranial Magnetic Stimulation for Preoperative Brain Mappingpremerabluecrossofwashington2027-02-05
    Navigated Transcranial Magnetic Stimulation for Preoperative Brain Mappingpremerabluecrossofwashington2027-02-05
    Navigated Transcranial Magnetic Stimulation for Preoperative Brain Mappingpremerabluecrossofwashington2027-02-05
    Calcitonin Gene-Related Peptide (CGRP) Inhibitors: Vyepti (eptinezumab-jjmr)Mass General Brigham Health Plan2027-01-04
    Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM)Kaiser Permanente2027-01-01
    Open Neuroplasty Lumbar PlexusCigna2026-12-15
    Laser Interstitial Thermal TherapyCigna2026-11-15
    Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®)bcbsvermont2026-11-01
    Artificial Cervical Intervertebral Discuniverahealthcare2026-10-15
    Lumbar Microdiscectomyuniverahealthcare2026-10-15

    Related Codes

    CPT-1005T-SUBSCALP-CONTINUOUS-BILATERAL-EEG-DEVICE-PROGRAMMING

    CPT 1005T: Subscalp Continuous Bilateral EEG System Programming

    CPT-1006T-SUBSCALP-IMPLANT-EEEG-DEVICE-PROGRAMMING

    CPT 1006T: Implantable Subscalp Continuous EEG Settings Adjustment

    CPT-1007T-SUBSCALP-CONTINUOUS-BILATERAL-EEG-30-DAY-INTERPRETATION

    CPT 1007T: Implanted Subscalp Continuous Bilateral EEG Review

    CPT-1008T-EXTERNAL-COMMUNICATOR-SETUP-SUBSCALP-CONTINUOUS-BILATERAL-EEG

    CPT 1008T: External Device Setup and Patient Education for Subscalp EEG

    CPT-1009T-SUBSCALP-CONTINUOUS-BILATERAL-EEG-REMOTE-INTERPRETATION-30-DAY

    CPT 1009T: Remote Subscalp Continuous Bilateral EEG Monitoring, 30 Days

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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