CPT 95939 Central Motor Evoked Potential Reimbursement | OpenPayer

Summary & Overview

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

CPT code 95939 represents a central motor evoked potential (cMEP) study of the upper and lower limbs, used diagnostically for multiple sclerosis and as a prognostic tool for motor recovery after stroke. This neurophysiology diagnostic procedure is clinically important for care planning, prognosis, and specialized neurologic assessment, with implications for inpatient and outpatient neurology services nationwide. Key national payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, typical sites of service, common modifiers and coding considerations, and payer coverage patterns. The publication summarizes benchmarks and reimbursement context where available, highlights policy updates that affect coding and payment, and explains how the procedure integrates into stroke and multiple sclerosis care pathways. The report is intended for billing managers, neurology clinicians, and policy analysts seeking a focused reference on coding, clinical application, and payer handling of CPT code 95939. Data not available in the input is identified where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare95939cptneurophysiologymotor-evoked-potentialmultiple-sclerosisstroke-prognosisdiagnostic-testingneurology

Billing Code Overview

CPT code 95939 describes a central motor evoked potential (cMEP) study performed in the upper and lower limbs. The procedure is used for diagnosis of multiple sclerosis and as a prognostic indicator for motor recovery after stroke.

Service type: Neurophysiology diagnostic study

Typical site of service: Hospital inpatient or outpatient neurophysiology laboratory, ambulatory surgical center, or specialized neurology clinic

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A typical patient is a 52-year-old with progressive unilateral weakness and sensory complaints referred to neurology for evaluation of suspected multiple sclerosis and to establish baseline corticospinal tract function. The provider performs a central motor evoked potential (cMEP) study of the upper and lower limbs to assess central motor pathway conduction, correlate with MRI and clinical findings, and help prognosticate motor recovery after recent ischemic stroke. The clinical workflow includes obtaining informed consent, review of prior imaging and neurologic exam, pretest screening for contraindications to transcranial magnetic stimulation or electrical stimulation (implanted devices, active seizure), positioning the patient supine or semi-recumbent, placing recording electrodes on selected limb muscles, delivering transcranial magnetic or electrical stimulation to motor cortex, recording motor responses from bilateral upper and lower limb muscles, measuring central motor conduction time (CMCT) and response amplitudes, documenting findings in the medical record, and communicating results to the referring clinician for diagnosis and prognosis. Typical site of service is an outpatient neurology clinic, hospital neurology department, or neurophysiology laboratory. The service type is diagnostic neurophysiology testing focused on central motor pathway assessment.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician interpretation of the test separate from the technical component.

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

CPT-95930-VISUAL-EVOKED-POTENTIAL-TESTING

CPT 95930: Visual Evoked Potential Testing

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

CPT 95929: Central Motor Evoked Potential Study for Lower Limbs

CPT-95937-NEUROMUSCULAR-JUNCTION-REPETITIVE-STIMULATION

CPT 95937: Neuromuscular Junction Testing by Repetitive Stimulation

CPT-95938-SHORT-LATENCY-SSEP-UPPER-AND-LOWER-LIMBS

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

CPT 95933: Orbicularis Oculi (Blink) Reflex Electrodiagnostic Test

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

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

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

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

Taxonomy Code	Specialty	Notes
2084P0800X	Neurology	Neurologists interpret cMEP studies and integrate results into neurologic diagnosis and prognosis.
208VP0002X	Physical Medicine & Rehabilitation	PM&R physicians may use results for functional prognosis and rehabilitation planning.
207RH0000X	Neurological Surgery	Neurosurgeons may request cMEP for preoperative mapping or prognostication.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G35`	Multiple sclerosis	cMEP assesses central motor conduction delays common in MS and helps document central pathway dysfunction.
`I63.9`	Cerebral infarction, unspecified	cMEP can be used as a prognostic indicator for motor recovery after ischemic stroke.
`G82.20`	Paraplegia, unspecified	Used when central motor pathway dysfunction results in significant lower extremity weakness; helps characterize residual conduction.
`G81.90`	Hemiplegia, unspecified affecting unspecified side	Relevant for stroke patients to document corticospinal tract conduction and prognosis for limb recovery.
`G04.90`	Encephalitis, unspecified	Central motor pathway testing may be used when infectious or inflammatory CNS processes cause motor deficits.
`M50.20`	Other cervical disc displacement, unspecified cervical region	When cervical myelopathy is suspected, cMEP can help evaluate corticospinal tract involvement.
`M51.16`	Intervertebral disc disorders with radiculopathy, lumbar region	Differentiates central motor conduction impairment from radiculopathy-related weakness when clinical overlap exists.
`G12.22`	Amyotrophic lateral sclerosis	cMEP helps evaluate central motor pathway involvement as part of the diagnostic workup for motor neuron disease.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95886`	Electromyography, needle, each extremity, with related paraspinal areas when performed; complete	Performed alongside cMEP to evaluate peripheral nerve and muscle contributions when weakness is present.
`95930`	Motor and sensory nerve conduction tests; limited (including F-waves when performed)	Nerve conduction studies are often performed prior to or with cMEP to assess peripheral conduction and differentiate central vs peripheral causes.
`95861`	Needle electromyography; one extremity with or without related paraspinal areas	Targeted EMG may complement cMEP when focal peripheral neuropathy is a consideration.
`95940`	Transcranial magnetic stimulation motor threshold determination (separate code for thresholding)	Threshold testing may be performed as part of or preceding cMEP studies when using transcranial magnetic stimulation techniques.
`95907`	Short-latency somatosensory evoked potential study including upper and lower limbs	SSEPs are frequently ordered together to evaluate sensory pathway integrity alongside motor pathway testing.

OpenPayer