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The rules say that plans must pay for a medical service or item if regular Medicare would pay for it in this case. 
You can find this rule at 42 Code of Federal Regulations (CFR) Section 422.101. 
 
  
  The rules state that intraoperative neurophysiological testing may be used to identify/prevent complications 
during surgery on the nervous system, its blood supply, or adjacent tissue. 
 
Monitoring can identify new neurologic impairment, identify, or separate nervous system structures (e.g., 
around or in a tumor), and can demonstrate which tracts or nerves are still functional. Intraoperative 
neurophysiological testing may provide relative reassurance to the surgeon that no identifiable complication 
has been detected up to a certain point, allowing the surgeon to proceed further and provide a more thorough or 
careful surgical intervention than would have been provided in the absence of monitoring. 
 
Some high-risk patients may be candidates for a surgical procedure only if monitoring is available. To establish 
medical necessity the following guidelines must be followed: 
 
    Intraoperative testing may be indicated with the following types of surgery: 
 
    Surgery of the aortic arch, its branch vessels, or thoracic aorta, including internal carotid artery surgery, 
when there is risk of cerebral ischemia 
    Resection of epileptogenic brain tissue or tumor 
    Resection of brain tissue close to the primary motor cortex and requiring brain mapping 
    Protection of cranial nerves: 
        tumors that are optic, trigeminal, facial, auditory nerves 
        cavernous sinus tumors 
        oval or round window graft 
        endolymphatic shunt for Meniere's disease 
        vestibular section for vertigo 
        microvascular decompression of cranial nerves 
    Correction of scoliosis or deformity of spinal cord involving traction on the cord 
    Protection of spinal cord where work is performed in close proximity to cord as in the removal of old 
hardware or where there have been numerous interventions 
    Spinal instrumentation requiring pedicle screws or distraction 
    Decompressive procedures on the spinal cord or cauda equina carried out for myelopathy or claudication 
where function of spinal cord or spinal nerves is at risk 
    Resection of: 
        Spinal cord tumors 
        Neuromas of peripheral nerves or brachial plexus, when there is risk to major sensory or motor nerves 
    Surgery for: 
        intracranial AV malformations 
        arteriovenous malformation of spinal cord 
        surgery for intractable movement disorders 
        cerebral vascular aneurysms 
    Arteriography, during which there is a test occlusion of the carotid artery 
    Circulatory arrest with hypothermia 
    Distal aortic procedures, where there is risk of ischemia to spinal cord 
    Leg lengthening procedures, where there is traction on sciatic nerve or other nerve trunks 
    Basil ganglia movement disorders 
    Surgery as a result of traumatic injury to spinal cord/brain 
    Deep brain stimulation 
 
You can find this information in the Local Coverage Determination (LCD) Intraoperative Neurophysiological 
Testing L34623. 
 
If you want to read these Medicare rules, you can go to this website www.medicareappeal.com. 
 The Plan contract says that the Plan covers items and services in accordance with Medicare rules.