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Digital Electroencephalography (DEEG) Analysis

Policy Number: MP-368

Latest Review Date: July 2023

Category:  Administrative                                                     


Digital electroencephalography analysis may be considered medically necessary when substantial digital analysis is performed as evidence by documentation in the patient’s medical record that an extra hour's work by the technician to process the data from the digital EEG, and an extra 20-30 minutes of physician time to review the technician's work and review the data produced was performed.

Digital electroencephalography analysis is considered not medically necessary simply when the EEG was recorded digitally.


Digital electroencephalography (DEEG) is the paperless acquisition and recording of the electroencephalogram (EEG) via computer-based instrumentation, with waveform storage in a digital format on electronic media, and waveform display on an electronic monitor or other computer output device. The procedure for an EEG involves placing a series of electrodes, with at least four recording channels, on the patient.  A very low electrical current is sent through the electrodes and the baseline brain energy is recorded on a diagnostic machine. Electrical activity is recorded and analyzed. Patients are then exposed to a variety of external stimuli, including bright or flashing light, noise or certain drugs, or asked to open and close their eyes, or to change breathing patterns. The electrodes transmit the resulting changes in brain wave patterns. Variations in wave characteristics correlate with neurological conditions and are used to diagnose specific medical conditions. Virtually all contemporary EEG recordings use digital recording methods, which involves the use of a digital EEG recorder (machine), but still involves visual analysis of the waveforms.

Digital analysis requires the use of quantitative analytical techniques. Ideally, DEEG creates a recording on a digital medium without loss of anything except the paper itself.  In practice, there may be some loss of detail especially at the lower sensitivity settings. Digital EEG also allows for simple but extremely useful digital utilities such as post hoc changes in filters, horizontal and vertical display scale and montage reformatting that allow greater flexibility in reading the EEG. These tools allow for better visual reading of the record than can be achieved with an analog paper record. 

Digital EEG is significantly more comprehensive than just a digital reading of the EEG. The analysis of the digital data may include data that expands more than 24 hours of continual monitoring. In general, this would entail an extra hour’s work by the technician to process the data from the EEG, and an extra 20-30 minutes of physician time to review the technician’s work and review the data produced.


Literature review through June 2023.

Summary of Evidence

Although DEEG has many benefits, it should not be considered a panacea. A skilled technologist is still required to obtain a high- quality recording. Furthermore, even a good technologist can have the misfortune of recording EEG activity, such as a seizure, at a sensitivity, filter setting, or montage that hampers accurate interpretation. This problem can easily be overcome using post hoc changes to the DEEG. However, basic concepts of polarity, principles of localization and montage design, and recording parameters still need to be understood for accurate interpretation. Because there are multiple ways of viewing the data with DEEG, the time required to read the record may exceed that for analog recordings.

Borusiak, et al (2010) reported on prospective analysis of DEEG performed in 382 healthy children (226 males, 156 females) ages 6–13 years, admitted to the hospital for minor head trauma. A digital EEG recording was carried out for a minimum of 20 minutes including hyperventilation and photic stimulation. Two board‐certified clinical neurophysiologists carried out analysis.

Epileptiform EEG discharges were detected in 25 of 382 children (11 of 226 males, 14 of 156 females) corresponding to an overall prevalence of 6.5%. Of these 25 children, four had either generalized or bifrontal spikes, 12 showed constant localized focal discharges, and nine showed multifocal discharges. Compared to previous studies using non‐DEEG recording, the prevalence of epileptiform EEG discharges in our population was significantly higher. No significant difference was found when comparing our data to prevalence’s recently reported in children with behavioral disturbances using DEEG. The study further highlights the urgent need to reevaluate the prevalence of epileptiform EEG discharges in healthy children using DEEG recordings in a larger cohort.

The recording parameters and conduct of the test are governed by the applicable standards for the American Clinical Neurophysiology Society (ACNS).

Additionally, the ACNS gives specific directions for billing for digital EEG analysis:

“Code 95957 should not be used simply when the EEG was recorded digitally. There is no additional charge for turning on an automated spike and seizure detector on a routine EEG, ambulatory EEG, or video-EEG monitoring. Nor is there an additional code for performing EEG on a digital machine instead of an older generation analog machine. Some features of digital EEG make it easier and quicker to read, and other features slow it down by providing new optional tricks and tools. Overall, it is about the same amount of work as an analog EEG.

Code 95957 is used when substantial additional digital analysis was medically necessary and was performed, such as 3D dipole localization. In general, this would entail an extra hour's work by the technician to process the data from the digital EEG, and an extra 20-30 minutes of physician time to review the technician's work and review the data produced. Most practitioners would not have the opportunity to do this advanced procedure. It would be more commonly used at specialty centers, e.g. epilepsy surgery programs. Note that the codes for "monitoring for identification and lateralization of cerebral seizure focus" already include epileptic spike analysis.”


Digital electroencephalography, DEEG, digital EEG, digital analysis of electroencephalogram


Not applicable.


Coverage is subject to member’s specific benefits.  Group specific policy will supersede this policy when applicable.

ITS: Home Policy provisions apply

FEP: Special benefit consideration may apply.  Refer to member’s benefit plan. 




Digital analysis of electroencephalogram (EEG) (e.g., for epileptic spike analysis)


  1. Abou-Khalil BW, Gallagher MJ, Macdonald RL. Epilepsies. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, editors. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. USA: Elsevier Inc; 2022. 1614-1663.
  2. American Academy of Neurology (AAN). Coding FAQs. 2020. Available at URL address:
  3. American Association of Neurological Surgeons (AANS). Epilepsy. Available at URL address: Treatments/Epilepsy
  4. American Clinical Neurophysiology Society. Guideline Twelve: Guidelines for long term monitoring for epilepsy. 2008.
  5. Borusiak, P., Zilbauer, M, Jenke, A. et al. Prevalence of epileptiform discharges in healthy children—New data from a prospective study using digital EEG. Epilepsia: Official Journal of the International League Against Epilepsy, 2010: Vol 51, Issue 7: 1185-1188.
  6. Dobrin S. (author). Seizures and Epilepsy in Adolescents and Adults. In: Kellerman, RD, Bope, ET (editors). Conn's Current Therapy 2018. Philadelphia: PA: Elsevier, 2018.
  7. Faulkner H et al. The utility of prolonged outpatient ambulatory EEG. Seizure 2012; 21(7):491-5.
  8. Keezer MR, Simard-Tremblay E, Veilleux M. The Diagnostic Accuracy of Prolonged Ambulatory Versus Routine EEG. Clin EEG Neurosci. 2016 Apr;47(2):157-61.
  9. Long Term Monitoring for Epilepsy. Electroencephalography and Clinical Neurophysiology 1993; 87: 437-58.
  10. Mesraoua B, Deleu D, Wieser HG. Stevanovic D (Ed.). Long-Term Monitoring: An Overview, Epilepsy - Histological, Electroencephalographic and Psychological Aspects, ISBN: 978-953-51-0082-9, In Tech, 2012. Available from:
  11. Nayak DS, Sajeesh P. Technical standards for digital electroencephalogram recording in epilepsy practice. Ann Indian Accad Neurol 2007:10:121-7.
  12. Schachter, SC. Evaluation and management of the first seizure in adults. In: UpToDate. Garcia P (Ed). Apr 29, 2022. UpToDate, Waltham, MA.
  13. Seneviratne U, Mohamed A, Cook M, D'Souza W. The utility of ambulatory electroencephalography in routine clinical practice: a critical review. Epilepsy Res. 2013 Jul; 105(1-2):1-12.
  14. Sirven, JI. Evaluation and management of drug-resistant epilepsy. In: UpToDate. Garcia P (Ed). May 15, 2023. UpToDate, Waltham, MA.
  15. St Louis EK, Foldvary-Schaefer, N. Sleep-related epilepsy syndromes. In: UpToDate. Avidan AY, Garcia P (Ed). May 10, 2023. UpToDate, Waltham, MA. Tatum WO, Desai N, Feyissa A. Ambulatory EEG: Crossing the divide during a pandemic. Epilepsy Behav Rep. 2021;16:100500.
  16. Tatum WO, Rubboli G, Kaplan PW, Mirsatari SM, Radhakrishnan K, Gloss D, et al. Clinical utility of EEG in diagnosing and monitoring epilepsy in adults. Clin Neurophysiol. 2018 May; 129(5):1056-1082.


Medical Policy Group, July 2009 (3)

Medical Policy Administration Committee, August 2009

Available for comment August 10-September 23, 2009

Medical Policy Group, January 2015 (3):  Updates to Description & References; no change in policy statement

Medical Policy Group, September 2018 (3): Updates to Key Points, References, and Key Words: added digital analysis of electroencephalogram. No changes to policy statement or intent.

Medical Policy Group, August 2021 (3): 2021 Updates to Key Points. No changes to policy statement.

Medical Policy Group, June 2022 (3): 2022 Updates to Key Points and References. No changes to policy statement or intent.

Medical Policy Group, July 2023 (3): 2023 Updates to Key Points, Benefit Applications, and References. Previous Coding Section removed. Reviewed by consensus. A peer reviewed literature analysis was completed and no new information was identified that would alter the coverage statement of this policy.

This medical policy is not an authorization, certification, explanation of benefits, or a contract. Eligibility and benefits are determined on a case-by-case basis according to the terms of the member’s plan in effect as of the date services are rendered. All medical policies are based on (i) research of current medical literature and (ii) review of common medical practices in the treatment and diagnosis of disease as of the date hereof. Physicians and other providers are solely responsible for all aspects of medical care and treatment, including the type, quality, and levels of care and treatment.

This policy is intended to be used for adjudication of claims (including pre-admission certification, pre-determinations, and pre-procedure review) in Blue Cross and Blue Shield’s administration of plan contracts.

The plan does not approve or deny procedures, services, testing, or equipment for our members. Our decisions concern coverage only. The decision of whether or not to have a certain test, treatment or procedure is one made between the physician and his/her patient. The plan administers benefits based on the member’s contract and corporate medical policies. Physicians should always exercise their best medical judgment in providing the care they feel is most appropriate for their patients. Needed care should not be delayed or refused because of a coverage determination.

As a general rule, benefits are payable under health plans only in cases of medical necessity and only if services or supplies are not investigational, provided the customer group contracts have such coverage.

The following Association Technology Evaluation Criteria must be met for a service/supply to be considered for coverage:

1. The technology must have final approval from the appropriate government regulatory bodies;

2. The scientific evidence must permit conclusions concerning the effect of the technology on health outcomes;

3. The technology must improve the net health outcome;

4. The technology must be as beneficial as any established alternatives;

5. The improvement must be attainable outside the investigational setting.

Medical Necessity means that health care services (e.g., procedures, treatments, supplies, devices, equipment, facilities or drugs) that a physician, exercising prudent clinical judgment, would provide to a patient for the purpose of preventing, evaluating, diagnosing or treating an illness, injury or disease or its symptoms, and that are:

1. In accordance with generally accepted standards of medical practice; and

2. Clinically appropriate in terms of type, frequency, extent, site and duration and considered effective for the patient’s illness, injury or disease; and

3. Not primarily for the convenience of the patient, physician or other health care provider; and

4. Not more costly than an alternative service or sequence of services at least as likely to produce equivalent therapeutic or diagnostic results as to the diagnosis or treatment of that patient’s illness, injury or disease.