Intraoperative Neurophysiologic Monitoring (Sensory-Evoked Potentials, Motor-Evoked Potentials, EEG Monitoring)

Section: Diagnostic Medical
Effective Date: November 01, 2019
Revised Date: October 15, 2019


Intraoperative neurophysiologic monitoring (IONM) describes a variety of procedures that have been used to monitor the integrity of neural pathways during high-risk neurosurgical, orthopedic, and vascular surgeries.


IONM,includes somatosensory-evoked potentials, motor-evoked potentials using transcranial electrical stimulation, brainstem auditory-evoked potentials, electromyography (EMG) of cranial nerves, electroencephalogram (EEG), and electrocorticography (ECoG), may be considered medically necessary for ANY of the following procedures:

  • Surgery of the aortic arch, its branch vessels, or thoracic aorta, including carotid artery surgery, when there is risk of cerebral or spinal cord ischemia; or
  • Resection of epileptogenic brain tissue or tumor; or
  • Resection of brain tissue close to the primary motor cortex and requiring brain mapping; or
  • Protection of cranial nerves during:
    • Resection of tumors involving the cranial nerves; or
    • Cavernous sinus tumors; or
    • Microvascular decompression of cranial nerves; or
    • Skull base surgery in the vicinity of the cranial nerves and surgeries of the foramen magnum; or
    • Oval or round window graft; or
  • Endolymphatic shunt for Meniere’s disease; or
  • Vestibular section for vertigo; or
  • Correction of scoliosis or deformity of spinal cord involving traction of the cord; or
  • Protection of spinal cord where work is performed in proximity to cord as in the placement or removal of old hardware or where there have been numerous interventions; or
  • Spinal instrumentation requiring pedicle screws or distraction; or
  • 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; or
  • Spinal cord tumors and spinal fractures (with the risk of cord compression); or
  • Neuromas of peripheral nerves of brachial plexus, when there is risk to major sensory or motor nerves; or
  • Surgery or embolization for intracranial arteriovenous malformations (AVMs); or
  • Embolization of bronchial artery AVMs or tumors; or
  • Surgery for arteriovenous malformation of spinal cord; or
  • Cerebral vascular aneurysms; or
  • Surgery for intractable movement disorders; or
  • Arteriography, during which there is a test occlusion of the carotid artery; or
  • Circulatory arrest with hypothermia [does not include surgeries performed under circulatory bypass (e.g., coronary artery bypass grafting (CABG), ventricular aneurysms); or
  • Distal aortic procedures, where there is risk of ischemia to spinal cord; or
  • Leg lengthening procedures, where there is traction on sciatic nerve or other nerve trunks; or
  • Basal ganglia movement disorders; or
  • Surgery as a result of traumatic injury to spinal cord/brain; or
  • Deep brain stimulation; or
  • Certain thyroid surgeries when there is;
    • Total removal of a complete lobe of the thyroid; or
    • Removal of the entire gland; or
    • Re-entry (re-operation) to a prior surgical field where scar tissue obscures the visual path of the recurrent laryngeal nerve.

Intraoperative neurophysiologic monitoring for any other procedure not listed above is considered not medically necessary.

Procedure Codes

92585 92586 95829 95860 95861 95863 95864
95867 95868 95907 95908 95910 95911 95912
95913 95925 95926 95927 95928 95929 95937
95938 95939 95940 95941 95955 G0453

Neurophysiological studies

Neurophysiological studies may be reimbursed individually whether performed independently or in conjunction with each other. However, if a provider reports any neurophysiological studies in addition to comprehensive evoked response audiometry, the charges should be combined and processed under code 92585. Modifier 59 may be reported with a non-E/M service, to identify it as distinct or independent from other non-E/M services performed on the same day. When modifier 59 is reported, the patient's records must support its use in accordance with CPT guidelines.


IONM should be reported under procedure code 95940, 95941, G0453 regardless of the specific monitoring performed (e.g., brainstem auditory evoked response, somatosensory evoked potentials, etc.). If any of the testing codes for neurophysiological monitoring are reported in conjunction with 95940, 95941, G0453 the services should be combined and processed under 95940, 95941, G0453. Modifier 59 may be reported with a non-E/M service, to identify it as distinct or independent from other non-E/M services performed on the same day. When modifier 59 is reported, the patient's records must support its use in accordance with CPT guidelines.

Reimbursement is limited to either 95940 (continuous intraoperative neurophysiology monitoring in the operating room, one on one monitoring requiring personal attendance, each 15 minutes (list separately in addition to code for primary procedure) or 95941 (continuous intraoperative neurophysiology monitoring, from outside the operating room (remote or nearby) or for monitoring of more than one case while in the operating room, per hour (List separately in addition to code for primary procedure)) per date of service.

Procedure Codes

92585 95940 95941 G0453

Intraoperative monitoring of visual-evoked potentials is considered experimental/investigational and therefore non-covered, due to a lack of scientific peer reviewed literature.

Intraoperative EMG and nerve conduction velocity monitoring during surgery on the peripheral nerves is considered not medically necessary.

Intraoperative monitoring of motor-evoked potentials using transcranial magnetic stimulation is considered experimental/investigational due to a lack of scientific peer reviewed literature and therefore non-covered.

Procedure Codes

0464T 95930 

Diagnosis Codes

Covered diagnosis codes for procedure codes 92586, 95829, 95860, 95861, 95863,95864, 95907, 95908, 95910, 95911, 95912, 95913, 95926, 95927, 95928, 95929, 95940, 95941, 95955, and G0453


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S14.103S S14.104A S14.104D S14.104S S14.105A S14.105D S14.105S
S14.106A S14.106D S14.106S S14.107A S14.107D S14.107S S14.108D
S14.108S S14.109A S14.109D S14.109S S14.111A S14.111D S14.111S
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S14.2XXA S14.2XXS S14.3XXA S14.3XXS S14.4XXA S14.4XXS S14.5XXA
S14.5XXS S22.000A S22.000B S22.000S S22.001A S22.001B S22.001S
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