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    OpenPayerBilling CodesImaging, Evaluation, Programming and Recording ProceduresCPT cpt-0464t-visual-evoked-potential-testing
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    CPT 0464T: Visual Evoked Potential (VEP) Testing

    CPT code 0464T describes visual evoked potential (VEP) testing, a diagnostic neurophysiology procedure that records the brain’s electrical responses to visual stimuli (for example, an alternating checkerboard pattern on a screen) to evaluate visual pathway function; service type: diagnostic electrophysiology testing; typical site of service: electrodiagnostic laboratory, neurology clinic, or hospital outpatient department.

    For related coverage guidance, see recent payer policy updates: Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillation, Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillation, Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillation.

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult or pediatric patient presenting to an ophthalmology, neurology, or neuro-ophthalmology clinic with new or progressive visual disturbances such as blurred vision, decreased visual acuity, visual field defects, or suspected optic nerve dysfunction. The provider performs 0464T (visual evoked potential, VEP) when clinical exam findings (for example, relative afferent pupillary defect, optic disc pallor, unexplained visual loss) or neuroimaging suggest pathology along the visual pathways. The workflow includes: pretest consent and history, electrode placement and impedance check, presentation of visual stimuli (commonly an alternating checkerboard pattern on a screen), recording cortical responses, interpretation by the performing clinician or neurodiagnostic specialist, and documentation of waveform latencies and amplitudes with comparison to age-matched norms. The test is often ordered to evaluate optic neuritis, demyelinating disease (e.g., multiple sclerosis), optic nerve compression, ischemic optic neuropathy, or unexplained vision loss when retinal and ocular media causes have been excluded. Typical sites of service include outpatient ophthalmology or neurology clinics, hospital neurodiagnostic laboratories, and ambulatory surgical centers when monitoring is needed in conjunction with other procedures.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    92134Static perimetry (e.g., Humphrey visual field)Performed to quantify visual field defects that complement VEP findings in optic nerve or pathway disease.
    92250Fundus photography with interpretation and reportUsed to document optic disc appearance and retinal status prior to VEP when structural causes are considered.
    92285External ocular photography with interpretationUsed for anterior segment documentation when visual symptoms might relate to ocular surface or media issues.
    95816Electroencephalogram (EEG) during event recorded by clinicianRelated neurophysiologic testing sometimes performed in the same neurodiagnostic session; different purpose but similar equipment and technologist expertise.
    95812EEG with video monitoringPerformed when combined cortical monitoring is needed; may be billed in conjunction with VEP if clinically indicated.

    Related Modifiers

    8 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…
    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…
    51Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…
    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…
    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…
    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…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    2084N0400X
    2084P0800X
    207K00000X
    183500000X
    291900000X
    376G00000X
    171R00000X
    174MM1900X

    Related ICD-10-CM Codes

    16 rows

    ICD-10-CM CodeDescription
    G37.0Diffuse sclerosis of central nervous system
    G45.8Other transient cerebral ischemic attacks and related syndromes
    G45.9Transient cerebral ischemic attack, unspecified
    G52.1Disorders of glossopharyngeal nerve
    G90.3Multi-system degeneration of the autonomic nervous system
    H40.9Unspecified glaucoma
    H43.9Unspecified disorder of vitreous body
    H47.22Hereditary optic atrophy
    H47.619Cortical blindness, unspecified side of brain
    H49.01Third [oculomotor] nerve palsy, right eye

    Showing 1–10 of 16

    Related Payer Policy Updates

    Specialty: Cardiology1 / 3

    10 rows

    PolicyPayerEffective Date
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2027-02-05
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2027-02-05
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2027-02-05
    Percutaneous Left Atrial Appendage Closure - Medical PolicyHealth-New-England2027-02-01
    Transcatheter Mitral Valve Repair Medical PolicyHealth-New-England2027-02-01
    Cardiac Electrophysiological (EP) Studies and Cardiac Ablation of Abnormal Electrical RhythmsCigna2027-01-15
    Biomarkers for Myocardial Infarction and Chronic Heart Failure Reimbursement PolicyHealthfirst2026-11-01
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2026-11-01
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2026-11-01
    Cardiology - TryvioCigna2026-11-01

    Related Codes

    CPT-0469T-RETINAL-POLARIZATION-SCANNING-VISUAL-SCREENING

    CPT 0469T: Retinal Polarization Scanning Visual Screening

    CPT-0472T-ARTIFICIAL-RETINA-PROGRAMMING-AND-EVALUATION

    CPT 0472T: Initial Evaluation and Programming of Artificial Retina

    CPT-0473T-ARTIFICIAL-RETINA-REPROGRAMMING

    CPT 0473T: Artificial Retina/Retinal Electrode Array Reprogramming

    CPT-0474T-ANTERIOR-SEGMENT-AQUEOUS-DRAINAGE-DEVICE-SUPRACILIARY-RESERVOIR

    CPT 0474T: Supraciliary Aqueous Drainage Device Placement, Anterior Segment

    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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