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    OpenPayerBilling CodesOther EEG Testing ProceduresCPT cpt-95955-intraoperative-eeg-monitoring-nonintracranial-surgery
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    CPT 95955: Intraoperative EEG Monitoring During Nonintracranial Surgery

    Medicare pays $138 on average nationally for this procedure.

    CPT code 95955 describes intraoperative electroencephalographic monitoring during nonintracranial surgeries such as cardiac surgery or carotid stenting, a monitoring service provided by neurophysiology or neuromonitoring teams to assess cerebral electrical activity in the operating room; service type: intraoperative EEG monitoring, typical site of service: hospital operating room or procedural suite during nonintracranial surgery.

    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 a 68-year-old male with severe carotid artery stenosis scheduled for carotid artery stenting under monitored anesthesia care. The neurology/electrophysiology team provides intraoperative electroencephalographic (EEG) monitoring to detect cerebral ischemia during balloon inflation and stent deployment. Preoperative workflow includes review of prior EEG/neurologic history, placement of surface scalp electrodes in the operating room by a neurophysiology technologist, baseline EEG acquisition, continuous monitoring throughout the procedure, real-time interpretation by a qualified physician (e.g., neurologist or neurophysiologist), and documentation of notable events (electrical changes, artifacts, interventions). Postprocedure, the monitoring team generates a concise report summarizing baseline activity, intraoperative EEG changes correlated with surgical time points, actions taken, and a final impression for the surgical and anesthesia records.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    95955Intraoperative neurophysiologic monitoring during nonintracranial surgery (e.g., cardiac surgery, carotid stenting)Primary code for continuous EEG monitoring during nonintracranial procedures; documents physician interpretation and real-time EEG surveillance.
    95816Electroencephalogram (EEG); monitoring for seizure, continuous 1–24 hoursMay be used when extended continuous EEG monitoring is required postoperatively or during prolonged intraoperative surveillance that meets criteria for continuous EEG reporting.
    95940Continuous intraoperative neurophysiological monitoring (cortical SSEPs, motor evoked potentials)Used when additional modalities such as somatosensory or motor evoked potentials are monitored concurrently with EEG during complex procedures.
    95941Continuous intraoperative neurophysiological monitoring, with physician supervision and interpretationUse when physician supervision/interpretation is billed for modalities other than or in addition to EEG monitoring.
    92587Evoked potential testing, e.g., brainstem auditory evoked potentialsUsed when event-related potentials are monitored alongside EEG to assess brainstem function during surgery.

    Related Modifiers

    9 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…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    73Modifier 73 indicates a facility-level outpatient hospital or ASC procedure that was discontinued after the patient was prepared and taken to the procedure/operating room but before any anesthesia…- When to use: Apply CPT modifier 73 on the FACILITY (outpatient hospital or ASC) claim when the patient has been fully prepared and physically taken into the procedure/operating room but the…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207X00000X
    207L00000X
    207P00000X
    208600000X
    204F00000X
    207VM0101X
    385H00000X
    163WP0200X

    Related Payer Policy Updates

    Specialty: Neurology/Neurosurgery1 / 3

    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-95954-EEG-ACTIVATION-WITH-PROVIDER-ATTENDANCE

    CPT 95954: EEG Activation with Drug or Physical Stimulation

    CPT-95957-COMPUTER-BASED-EEG-ANALYSIS

    CPT 95957: Computer-Based Analysis of Electroencephalogram

    CPT-95958-WADA-ACTIVATION-TEST-EEG-MONITORING

    CPT 95958: Wada Activation Test with EEG Monitoring

    CPT-95961-INTRACRANIAL-SEIZURE-LOCALIZATION-BRAIN-MAPPING

    CPT 95961: Intracranial EEG Mapping for Seizure Localization

    CPT-95962-INTRACRANIAL-ELECTROCORTICOGRAPHY-STIMULATION-MAPPING

    CPT 95962: Intraoperative Brain Surface/Subcortical Mapping for Seizure Localization

    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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