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    v1.0.30
    OpenPayerBilling CodesOther EEG Testing ProceduresCPT cpt-95958-wada-activation-test-eeg-monitoring
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    CPT 95958: Wada Activation Test with EEG Monitoring

    Medicare pays $531 on average nationally for this procedure.

    CPT code 95958 describes the Wada activation test performed prior to ablative epilepsy surgery or occasionally before tumor resection; this procedure includes electroencephalographic (EEG) monitoring and is a diagnostic neurophysiology service typically performed in an inpatient or specialized ambulatory surgical setting with neurology or neurophysiology teams.

    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 34-year-old right-handed patient with medically refractory temporal lobe epilepsy is scheduled for preoperative language and memory lateralization testing prior to planned left anterior temporal lobectomy. The patient is admitted to the neurointerventional suite or an inpatient neurology unit. Under awake sedation and local anesthesia, a neurointerventionalist or neurosurgeon places a femoral arterial catheter for selective carotid artery injection. The neuropsychology team administers standardized language and memory tasks while the interventional team injects amobarbital into the ipsilateral and contralateral carotid distributions in separate trials. Continuous electroencephalographic monitoring is performed during and after each injection to document hemispheric activation, seizure activity, and after-discharges. Findings inform surgical planning to spare dominant-hemisphere language cortex and to estimate postoperative memory risk. Typical sites of service include an inpatient neurosurgery or neurology unit, an interventional radiology suite, or an ambulatory surgical center when available and appropriate. Common clinical workflow steps: pre-procedure anesthesia and consent, baseline EEG and neurocognitive testing, arterial catheter placement, sequential Wada injections with EEG monitoring, post-procedure neurologic and EEG observation, and multidisciplinary case review for surgical decision-making.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    95958Wada activation test with EEG monitoringPrimary code for the procedure described.
    92607Diagnostic analysis of speech-language pathologist services (note: example code)Potentially used for pre- or post-procedure detailed speech-language evaluation; used by SLPs when coded separately.
    95951Nervous system testing (note: example code)May be used for additional intraoperative or extraoperative EEG monitoring services when performed separately from the Wada test.
    76937Ultrasound guidance for vascular access (note: example code)May be billed if ultrasound guidance is used for arterial access prior to selective carotid injection.
    36620Arterial catheterization; percutaneous, for angiography or other diagnostic purposesUsed when arterial catheterization is performed for selective carotid injection as part of the Wada test workflow.
    92507Speech/hearing therapy diagnostic; includes language evaluation (note: example code)Used for formal language/memory testing by speech-language pathology as part of pre-surgical assessment.

    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…
    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…
    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…
    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…
    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…
    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…
    27Modifier 27 indicates a separate, subsequent outpatient hospital E/M service provided to the same patient on the same date by a different provider in a hospital outpatient setting. It is a…- Use modifier -27 on facility (hospital outpatient/ambulatory service center) claims to report a subsequent, separate, and distinct outpatient E/M service provided to the same patient on the same…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    261QD1600X
    311Z00000X
    2355S0801X
    152WS0006X
    103TP0016X
    2083A0100X
    207RI0200X
    207PT0002X

    Related ICD-10-CM Codes

    26 rows

    ICD-10-CM CodeDescription
    C71.9Malignant neoplasm of brain, unspecified
    D33.3Benign neoplasm of cranial nerves
    D33.9Benign neoplasm of central nervous system, unspecified
    F44.4Conversion disorder with motor symptom or deficit
    F44.5Conversion disorder with seizures or convulsions
    G31.84Mild cognitive impairment of uncertain or unknown etiology
    G37.9Demyelinating disease of central nervous system, unspecified
    G40.219Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus
    G40.301Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus
    G40.309Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus

    Showing 1–10 of 26

    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-95955-INTRAOPERATIVE-EEG-MONITORING-NONINTRACRANIAL-SURGERY

    CPT 95955: Intraoperative EEG Monitoring During Nonintracranial Surgery

    CPT-95957-COMPUTER-BASED-EEG-ANALYSIS

    CPT 95957: Computer-Based Analysis of Electroencephalogram

    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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