95928 CPT MEP Upper Limb Reimbursement | OpenPayer

Summary & Overview

CPT 95928: Central Motor Evoked Potential Study for Upper Limb Muscles

CPT code 95928 covers a central motor evoked potential (MEP) study in which the motor cortex is transcranially stimulated with a mild electric current to evaluate motor pathways to the upper limb muscles. This neurophysiologic test is used in diagnostic and intraoperative settings to assess integrity of central motor conduction and to help guide management in neurologic and neurosurgical care. Nationally, precise coding for specialized neurophysiology procedures like 95928 matters for clinical documentation, care coordination, and claims processing given the technical skill and monitoring environment required.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical purpose and typical sites of service for the procedure, common modifiers used in billing, and what is available in the input regarding associated taxonomies and related billing elements. The publication also summarizes typical service lines and payment context relevant to hospital, ambulatory surgical center, and neurophysiology laboratory settings. Data not available in the input will be noted explicitly where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare95928CPTmotor-evoked-potentialneurophysiologyintraoperative-monitoringupper-limbdiagnostic-testing

Billing Code Overview

CPT code 95928 describes a central motor evoked potential (MEP) study performed by transcranial electrical stimulation of the motor cortex to evaluate motor pathways supplying the upper limb muscles. The procedure involves applying a very mild electric current to the scalp to elicit responses in upper extremity muscles and assess central motor conduction.

Service Type: Neurophysiology diagnostic study — intraoperative or neurodiagnostic motor pathway assessment

Typical Site of Service: Hospital operating room, ambulatory surgical center, or neurophysiology laboratory

Clinical & Coding Specifications

Clinical Context

A typical patient is a 45-year-old adult referred to an intraoperative neurophysiology lab for assessment of corticospinal tract integrity to the upper extremities. The patient presents with progressive weakness and spasticity of the right arm after a cervical spine tumor resection performed earlier the same day. The neurosurgeon requests a central motor evoked potential (MEP) study to transcranially stimulate the motor cortex and record responses from upper limb muscles while the patient is under general anesthesia to evaluate motor pathway function and guide intraoperative decision making. The clinical workflow includes: pre-procedure verification of indications and neuromonitoring plan, placement of stimulation and recording electrodes on the scalp and target upper limb muscles, delivery of transcranial electrical stimuli, recording and interpretation of compound muscle action potentials, documentation of baseline and any intraoperative changes, real-time communication of significant changes to the surgical team, and generation of a finalized neurophysiology report for the medical record. Typical site of service is an operating room or intraoperative neuromonitoring suite within a hospital. Service type is diagnostic neurophysiology testing (intraoperative neurophysiologic monitoring of motor pathways).

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician/specialist interpretation and reporting portion of the service separate from technical equipment and technician time.

CPT 95938: Short‑Latency Somatosensory Evoked Potential Study

CPT-95927-SHORT-LATENCY-SOMATOSENSORY-EVOKED-POTENTIAL-STUDY

CPT 95927: Short-Latency Somatosensory Evoked Potential Study

CPT-95926-LOWER-LIMB-SHORT-LATENCY-SSEP

CPT 95926: Short-Latency Somatosensory Evoked Potential, Lower Limbs

CPT-95929-CENTRAL-MOTOR-EVOKED-POTENTIAL-LOWER-LIMB

CPT 95929: Central Motor Evoked Potential Study for Lower Limbs

CPT-95933-ORBICULARIS-OCULI-BLINK-REFLEX-ELECTRODIAGNOSTIC-TEST

CPT 95933: Orbicularis Oculi (Blink) Reflex Electrodiagnostic Test

CPT-95939-CENTRAL-MOTOR-EVOKED-POTENTIAL-UPPER-LOWER-LIMBS

CPT 95939: Central Motor Evoked Potential Study, Upper and Lower Limbs

CPT-95930-VISUAL-EVOKED-POTENTIAL-TESTING

CPT 95930: Visual Evoked Potential Testing

CPT-95925-UPPER-LIMB-SOMATOSENSORY-EVOKED-POTENTIAL-SSEP

CPT 95925: Short‑Latency Somatosensory Evoked Potential, Upper Limbs

CPT-95937-NEUROMUSCULAR-JUNCTION-REPETITIVE-STIMULATION

CPT 95937: Neuromuscular Junction Testing by Repetitive Stimulation

Taxonomy Code	Specialty	Notes
`207RC0000X`	Neurology	Neurologists commonly interpret and report intraoperative neurophysiology monitoring studies.
`207RR0500X`	Neurophysiologist	Clinical neurophysiologists or neurophysiology specialists perform and interpret MEP studies.
`2084P0800X`	Neurosurgery	Neurosurgeons commonly request and collaborate on intraoperative monitoring for spinal and cranial procedures.
`207L00000X`	Physical Medicine & Rehabilitation	PM&R physicians may perform or interpret electrodiagnostic studies in some centers and consult on motor pathway assessments.
`364S00000X`	Clinical Neurodiagnostic Technologist	Technologists perform electrode placement and data acquisition under physician supervision.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G83.0`	Flaccid paraplegia	Central motor pathway testing may be used to evaluate the extent and prognosis of motor impairment affecting the arms or legs.
`G83.4`	Cauda equina syndrome	MEPs help assess motor tract integrity when surgical decompression includes risk to motor pathways; relevant when upper limb involvement is present in atypical cases.
`G35`	Multiple sclerosis	Demyelinating disease can affect corticospinal tracts; MEPs assess conduction and help correlate clinical deficits.
`C72.9`	Malignant neoplasm of brain, unspecified	Intracranial tumors near motor cortex require monitoring of motor pathways during resection; `95928` assesses upper limb motor tracts.
`M50.2`	Other cervical disc displacement	Cervical spine pathology can compress corticospinal tracts or nerve roots; intraoperative MEPs monitor motor function to the upper extremities.
`M51.2`	Other intervertebral disc displacement, thoracic region	Thoracic procedures less commonly relate to upper limb MEPs but may be included for comprehensive monitoring in multilevel spinal surgery.
`I69.391`	Hemiplegia and hemiparesis following cerebral infarction affecting right dominant side	Post-stroke motor pathway assessment with MEPs can be used in prognostic evaluation or during surgical interventions affecting motor areas.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95886`	Needle electromyography; up to 6 muscles, with nerve conduction studies when performed	Often performed pre- or postoperatively to assess peripheral motor unit function in conjunction with central MEP testing for comprehensive motor pathway evaluation.
`95926`	Central motor evoked potentials; stimulation of the motor cortex with recording from limb muscles (separate code for lower limb)	Related central MEP code used for evaluation of lower extremity motor pathways; may be performed alongside `95928` when both upper and lower limbs are monitored.
`95927`	Cortical sensory evoked potentials (SSEP)	Somatosensory evoked potentials are commonly monitored concurrently with MEPs to provide complementary assessment of sensory pathways during surgery.
`95860`	Needle electromyography, non-needle (repetitive nerve stimulation) — (Note: code description context)	Peripheral nerve conduction or EMG studies may be used before or after MEP testing to localize peripheral vs central causes of motor deficit.
`95940`	Intraoperative neurophysiology monitoring (comprehensive) — (Note: code may represent compound monitoring services)	Comprehensive intraoperative monitoring packages or facility-level technical services may accompany specific MEP studies; this code represents related monitoring activity in the operative setting.

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