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    v1.0.30
    OpenPayerBilling CodesMEG Testing ProceduresCPT cpt-95966-magnetoencephalography-evoked-brain-magnetic-activity
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    CPT 95966: Magnetoencephalography, Evoked Brain Magnetic Activity

    Medicare pays $218 on average nationally for this procedure.

    CPT code 95966 describes magnetoencephalography (MEG) recording and analysis of evoked brain magnetic activity, a neuroimaging procedure that captures magnetic fields produced by neural activity; the service is a diagnostic neurophysiology study typically performed in an outpatient neurodiagnostic laboratory or hospital imaging department using specialized MEG sensor arrays to localize cortical activity and characterize evoked responses.

    For related coverage guidance, see recent payer policy updates: Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM), Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®), Lumbar Microdiscectomy.

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult referred for pre-surgical functional brain mapping or evaluation of focal epileptiform activity not clearly localized on EEG or MRI. The patient arrives to an outpatient neurodiagnostic or hospital-based neurophysiology lab where a magnetoencephalography (MEG) technologist explains the procedure, applies head localization coils, and records the patient’s evoked magnetic fields while the patient performs rest, task, or sensory stimulation protocols. A board-certified neurologist or clinical neurophysiologist supervises, reviews raw data for artifact, and performs advanced source localization and analysis to identify epileptic foci or eloquent cortex. The imaging output is correlated with MRI for multimodal mapping and provided in a clinical report used for surgical planning or diagnostic clarification. Typical site of service is an outpatient hospital-based MEG suite or specialized ambulatory neurodiagnostic center. The service type is diagnostic neurophysiology (magnetoencephalography) performed with professional interpretation and analysis under CPT code 95966.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    95966Magnetoencephalography (MEG) recording and analysis of evoked brain magnetic activityPrimary code for MEG studies; includes recording and professional analysis.
    95816Electroencephalogram (EEG); with video recording for 24 hours or moreOften performed before or alongside MEG for prolonged monitoring to capture and correlate seizures.
    92620Data not available in the input.Data not available in the input.
    70553Magnetic resonance (MRI) brain with functional MRI when performedStructural MRI with or without functional mapping is routinely coregistered with MEG source localization for surgical planning.
    95970Electrocorticography, intraoperative cortical mappingUsed in the operative setting after MEG mapping to confirm functional areas during surgery.
    93799Data not available in the input.Data not available in the input.

    Related Modifiers

    10 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…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    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…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    82Modifier 82 is appended to a surgical CPT code to indicate that an attending physician acted as an assistant because a qualified resident surgeon was unavailable. In teaching hospitals it documents…- When to use: Append modifier 82 in teaching-hospital settings to indicate a physician served as an assistant surgeon because a qualified resident surgeon was unavailable (includes situations where…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RC0000X
    2084P0800X
    207L00000X
    376J00000X
    163WP0000X
    2084D0003X
    133NN1002X
    343900000X

    Related ICD-10-CM Codes

    25 rows

    ICD-10-CM CodeDescription
    F03.90Unspecified dementia, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
    F07.0Personality change due to known physiological condition
    F44.9Dissociative and conversion disorder, unspecified
    G25.0Essential tremor
    G31.84Mild cognitive impairment of uncertain or unknown etiology
    G40.219Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus
    G40.311Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus
    G40.411Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus
    G40.801Other epilepsy, not intractable, with status epilepticus
    G40.901Epilepsy, unspecified, not intractable, with status epilepticus

    Showing 1–10 of 25

    Related Payer Policy Updates

    Specialty: Neurology/Neurosurgery1 / 2

    10 rows

    PolicyPayerEffective Date
    Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM)Kaiser Permanente2027-01-01
    Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®)bcbsvermont2026-11-01
    Lumbar Microdiscectomyuniverahealthcare2026-10-15
    Artificial Cervical Intervertebral Discuniverahealthcare2026-10-15
    Lumbar Decompressionuniverahealthcare2026-10-15
    Responsive Neurostimulation for Focal EpilepsyPremera Bluecross2026-10-14
    Intraoperative MonitoringProvidence Health Plan2026-10-01
    Intraoperative MonitoringProvidence Health Plan2026-10-01
    High-Intensity Focused UltrasoundMass General Brigham Health Plan2026-10-01
    Vagal Nerve StimulationAmbetter Nevada2026-10-01

    Related Codes

    CPT-95965-MAGNETOENCEPHALOGRAPHY-MEG-SPONTANEOUS-BRAIN-ACTIVITY

    CPT 95965: Magnetoencephalography (MEG) Recording and Analysis

    CPT-95967-MEG-EVOKED-BRAIN-ACTIVITY-ADDITIONAL-MODALITY

    CPT 95967: Magnetoencephalography for Evoked Brain Functional Modality

    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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