Clinical UM Guideline


Subject:Visual, Somatosensory and Motor Evoked Potentials
Guideline #:  CG-MED-50Current Effective Date:  05/13/2013
Status:NewLast Review Date:  05/09/2013

Description

Evoked potentials (EPs) or evoked responses are electrical waves created in the central nervous system by peripheral stimulation of a sensory organ. EPs are used to identify abnormal central nervous system function that may not be detected clinically. This document addresses non-operative uses for the following EP studies:

Note: This document does not address intra-operative uses for VEPs, SEPs, or MEPs.

Clinical Indications

I. Visual Evoked Potentials:

Medically Necessary:

Visual evoked potentials (VEPs) are considered medically necessary for the diagnosis, evaluation, or monitoring of any of the following conditions:

Not Medically Necessary:

Visual evoked potentials (VEPs) are considered not medically necessary for all other uses, including but not limited to routine screening of infants.

II. Somatosensory evoked potentials (SSEPs):

Medically Necessary:

Somatosensory evoked potentials (SSEPs) are considered medically necessary when the results will be used to guide clinical management for the following conditions:

Not Medically Necessary:

Somatosensory evoked potentials (SSEP) are considered not medically necessary for all other uses

III. Motor evoked potential testing

Medically Necessary:

Motor evoked potentials are considered medically necessary for evaluation of suspected hysterical or factitious paralysis.

Not Medically Necessary:

Motor evoked potentials are considered not medically necessary in the non-operative setting when the above criteria are not met.

Coding

The following codes for treatments and procedures applicable to this guideline are included below for informational purposes.  A draft of future ICD-10 Coding (effective 10/01/2014) related to this document, as it might look today, is included below for your reference. Inclusion or exclusion of a procedure, diagnosis or device code(s) does not constitute or imply member coverage or provider reimbursement policy.  Please refer to the member's contract benefits in effect at the time of service to determine coverage or non-coverage of these services as it applies to an individual member.

CPT 
0333TVisual evoked potential, screening of visual acuity, automated [Note: code effective 07/01/2013]
95925Short-latency somatosensory evoked potential study, stimulation of any/all peripheral nerves or skin sites, recording from the central nervous system; in upper limbs
95926Short-latency somatosensory evoked potential study, stimulation of any/all peripheral nerves or skin sites, recording from the central nervous system; in lower limbs
95927Short-latency somatosensory evoked potential study, stimulation of any/all peripheral nerves or skin sites, recording from the central nervous system; in the trunk or head
95928Central motor evoked potential study (transcranial motor stimulation); upper limbs
95929Central motor evoked potential study (transcranial motor stimulation); lower limbs
95930Visual evoked potential (VEP) testing central nervous system, checkerboard or flash
95938Short-latency somatosensory evoked potential study, stimulation of any/all peripheral nerves or skin sites, recording from the central nervous system; in upper and lower limbs
95939Central motor evoked potential study (transcranial motor stimulation); in upper and lower limbs
  
ICD-9 Diagnosis 
300.10-300.19Dissociative, conversion and factitious disorders [hysterical or factitious paralysis]
333.0Other degenerative diseases of the basal ganglia
334.0-334.9Spinocerebellar disease
336.9Unspecified disease of spinal cord (myelopathy NOS)
340Multiple sclerosis
341.0-341.9Other demyelinating diseases of central nervous system
348.1Anoxic brain damage
348.82Brain death
369.00-369.9Blindness and low vision
377.00-377.54Disorders of the optic nerve
377.9Unspecified disorder of optic nerve and visual pathways
768.5-768.6Birth asphyxia
768.70-768.73Hypoxic-ischemic encephalopathy [HIE]
768.9Unspecified birth asphyxia in liveborn infant
780.01Coma
854.00-854.19Intracranial injury of other and unspecified nature
997.01Central nervous system complication (anoxic brain damage)
  
ICD-10 DiagnosisICD-10-CM draft codes; effective 10/01/2014:
F44.4Conversion disorder with motor symptom or deficit [hysterical paralysis]
F68.10-F68.13Factitious disorder
G11.1-G11.9Hereditary ataxia
G23.0-G23.9Other degenerative diseases of basal ganglia
G35Multiple sclerosis
G36.0-36.9Other acute disseminated demyelination
G37.0-G37.9Other demyelinating disease of central nervous system
G93.1Anoxic brain damage, not elsewhere classified
G93.82Brain death
G95.9Disease of spinal cord, unspecified (myelopathy NOS)
G97.81-G97.82Other intraoperative and postprocedural complications and disorders of nervous system
H46.00-H46.9Optic neuritis
H47.011-H47.49Disorders of optic nerve, not elsewhere classified
H54.0-H54.8Blindness and low vision
P84Other problems with newborn (asphyxia of newborn NOS)
P91.60-P91.63Hypoxic ischemic encephalopathy [HIE]
R40.20-R40.244Coma
S06.1X6A-S06.9X6SIntracranial injury (with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving [code range with 6th character 6 and 7th character A-S]
  
Discussion/General Information

EPs are recordings of the nervous system's electrical response to the stimulation of specific sensory pathways. These recordings have the ability to provide information relative to the functional integrity of pathways within the nervous system. Only a few EPs are used on a routine basis and those most frequently encountered include VEPs and SSEPs.

Visual Evoked Potentials (VEPs)

VEPs track signals from the retina to the visual cortex and determine how a visual system reacts to light. A common indication for VEPs is to help confirm the diagnosis of MS, or to evaluate and monitor MS. In general, myelin plaques which occur in MS slow the speed of VEP wave peaks. Over time VEPs in individuals with MS become progressively slower eventually attenuating in amplitude as demyelination increases (Creel, 2012). The American Academy of Neurology (AAN) (Gronseth, 2000) recommends VEPs as probably useful to identify those at increased risk for clinically definite MS.

VEPs have also been used for other conditions including neuromyelitis optica (NMO) or other demyelinating disorders of the optic nerves, or for a suspected disorder of the optic nerve, optic chiasm or optic radiations not explained by magnetic resonance imaging (MRI), computerized tomography (CT), infectious diseases or metabolic disorders.

The U.S. Preventive Services Task Force (USPSTF) (2011) has not recommended vision screening for infants and young children. The USPSTF concludes that the current evidence is insufficient to assess the balance of benefits and harms of vision screening for children less than three years of age.

Somatosensory

SSEPs are electrical waves that are generated by the response of sensory neurons to stimulation. An abnormal SSEP finding demonstrates that there is dysfunction within the somatosensory pathways.

SSEP studies may be useful for helping to predict outcomes in persons with traumatic, hypoxic-ischemic and other diffuse brain injuries, who are comatose. Rothstein (2009) studied 50 comatose individuals with preserved brainstem function after cardiac arrest. A total of 23 of the 50 had bilateral absence of cortical EPs and all died without awakening. Neuropathological study in seven of those that died displayed widespread ischemic changes or frank cortical laminar necrosis. The remaining 27 had normal or delayed central conduction times with some dying without awakening or entering a persistent vegetative state. The majority of individuals with normal central conduction times had good outcomes, whereas a delay in central conduction times increased the likelihood of neurologic deficit or death. It was noted that greater use of SSEPs in anoxic-ischemic coma and severe brain trauma would identify those persons unlikely to recover.

Wijdicks and colleagues (2006) for the Quality Standards Subcommittee of the American Academy of Neurology issued a practice parameter on "Prediction of outcome in comatose survivors after cardiopulmonary resuscitation (an evidence-based review)". The authors recommended that the assessment of poor prognosis can be guided by the bilateral absence of cortical SSEPs (N20 response) within 1 to 3 days (recommendation level B).

The American Academy of Neurology (AAN) (Gronseth, 2000) recommends SEPs as possibly useful to identify those at increased risk of for developing clinically definite MS.

Additional indications for SSEPs include: acute anoxic encephalopathy; deficit of the central nervous system identified on exam, but not explained by appropriate imaging studies; demyelinating diseases under certain conditions; unexplained myelopathy; spinocerebral degeneration (such as Friedreich's ataxia); spinal cord lesions secondary to trauma when the need for surgical intervention is uncertain; or suspected brain death.

Motor Evoked Potentials (MEPs)

Motor evoked potentials (MEPs) evaluate motor pathways located in the anterolateral spinal tracts perfused by the anterior spinal artery. Single- or repetitive-pulse stimulation of the brain causes the spinal cord and peripheral muscles to produce neuroelectrical signals known as MEPs. In a case series, Cantello and colleagues (2001) reviewed the use of MEPs for diagnosing psychogenic or hysterical paralysis. The authors concluded that MEP studies assisted in the diagnosis of psychogenic paralysis and noted that if nerve trunks and muscles were found to be intact, a psychogenic cause for paralysis, may be implied. Additionally, specialty consensus review indicates that MEPs are useful in cases of hysterical or factitious paralysis. There is a lack of peer review literature to support the use of non-operative motor evoked potentials testing for other uses.

Definitions

Friedreich's ataxia: A rare genetic disease that affects the muscles and heart.

Hysterical paralysis: An uncommon psychogenic, nonorganic loss of motor function.

References

Peer Reviewed Publications:

  1. Cantello R, Boccagni C, Comi C, et al. Diagnosis of psychogenic paralysis: the role of motor evoked potentials. J Neurol. 2001; 248(10):889-897.
  2. Djuric S, Djuric V, Zivkovic M, et al. Are somatosensory evoked potentials of the tibial nerve the most sensitive test in diagnosing multiple sclerosis? Neurol India. 2010; 58(4):537-541.
  3. Rothstein TL. The role of evoked potentials in anoxic-ischemic coma and severe brain trauma. J Clin Neurophysiol. 2000; 17(5):486-497.
  4. Young B, Eggenberger E, Kaufman D. Current electrophysiology in ophthalmology: a review. Curr Opin Ophthalmol. 2012; 23(6):497-505.

Government Agency, Medical Society, and Other Authoritative Publications:

  1. Creel DJ. Visually Evoked Potentials. 2012 Mar 01. In: Kolb H, Fernandez E, Nelson R, editors. Webvision: The Organization of the Retina and Visual System [Internet]. Salt Lake City (UT): University of Utah Health Sciences Center; 1995. Available at: http://www.ncbi.nlm.nih.gov/books/NBK107218/. Accessed on March 15, 2013.
  2. Gronseth GS, Ashman EJ. Practice parameter: the usefulness of evoked potentials in identifying clinically silent lesions in patients with suspected multiple sclerosis (an evidence-based review): Report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology. 2000; 54(9):1720-1725.
  3. U.S. Preventive Services Task Force. Screening for visual impairment in children ages 1 to 5 years. January 2011. Available at: http://www.uspreventiveservicestaskforce.org/uspstf11/vischildren/vischildrs.htm. Accessed March 15, 2013.
  4. Wijdicks EF, Hijdra A, Young GB, et al; Quality Standards Subcommittee of the American Academy of Neurology. Practice parameter: prediction of outcome in comatose survivors after cardiopulmonary resuscitation (an evidence-based review): report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology. 2006; 67(2):203-210.
Web Sites for Additional Information
  1. National MS Society. Diagnosing MS. Available at: http://www.nationalmssociety.org/about-multiple-sclerosis/what-we-know-about-ms/diagnosing-ms/index.aspx?vm=r. Accessed on March 5, 2013.
Index

Motor Evoked Potential
Motor Evoked Response
Somatosensory Evoked Potentia
Somatosensory Evoked Response
Visual Evoked Potential
Visual Evoked Response

The use of specific product names is illustrative only. It is not intended to be a recommendation of one product over another, and is not intended to represent a complete listing of all products available.

History

Status

Date

Action

New05/09/2013Medical Policy & Technology Assessment Committee (MPTAC) review. Initial document development.