Case review required for excess studies

Requests that deviate from the policy's Maximum Number of Studies Table or established norms for the quantity and variety of procedures are subject to case review and require additional documentation and physician review when exceeding typical annual limits.

• Case review expected when there is deviation from established norms for quantity and variety of procedures (Maximum Number of Studies Table).
• Physician review and supplemental documentation required for studies beyond generally accepted amounts.

Follow per-diagnosis frequency and number limits

Frequency and allowable number of EDX studies per diagnosis are specified (per-condition limits for limbs studied by EMG and total nerves studied by NCS); exceeding these per-diagnosis limits may require prior authorization or justification.

• Use the per-condition limbs/studies limits (e.g., carpal tunnel unilateral NCS total = 7; radiculopathy NCS total = 7) when planning testing.
• Prior authorization may be required when recommended numbers are exceeded.

Provide supplemental documentation / expect peer review for high-volume testing

When testing exceeds recommended limits or usage norms (for example approaching/exceeding the 90th percentile), provide supplemental documentation justifying additional tests and expect possible peer review.

• Document clinical rationale and differential diagnoses that necessitate extra studies.
• Supplemental physician justification should accompany requests above typical limits.

Obtain EDX for specified clinical triggers

Obtain EDX testing when standard evaluation does not indicate a likely etiology, when symptoms are moderate to severe, or when presentation is atypical or rapidly progressive; tailor testing to the individual clinical question.

• Consider EDX after history and exam when imaging or routine workup are non-diagnostic.
• EDX is appropriate for moderate/severe symptoms, atypical features, or rapid progression.

Prior authorization — none explicitly required

No explicit prior authorization requirement is stated in these document sections; however, requests exceeding established study norms are subject to case review and may need additional documentation.

• Prior authorization is not explicitly required by the policy text in these chunks.
• Case review applies when utilization deviates from norms (see Maximum Number of Studies Table).

Link EMG billing to same-day NCS status

Bill EMG CPT codes based on whether NCS is performed the same day: when NCS is same-day, use add-on codes 95885–95887 (per limb units); when NCS is not same-day, use primary EMG codes 95860–95864, 95870, or the relevant non‑extremity codes.

• 95885–95887 are add-on codes billed per limb and may not be billed independently when NCS is performed same day.
• Use 95860–95864, 95870 or 95865–95869 when NCS is not performed same day.

Prior authorization — no explicit requirement stated

No explicit prior authorization requirements are stated in these document sections; clinical documentation should support medical necessity consistent with the CPB.

• Documentation must support medical necessity even when prior authorization is not explicitly required.
• Refer to case review rules for instances of high utilization or deviation from norms.

Document failed non-surgical management and PT for radiculopathy

For evaluation of radiculopathy, document failed non-surgical medical management including at least 6 weeks of in-person formal physical therapy within the past year; PT must be confirmed by PT notes or member claims history.

• PT must be in-person (not home or virtual) for at least 6 weeks in the past year.
• Confirm PT with actual PT notes or documentation in member claims history.

Limit use of automated NCS devices; obtain standard NCS when indicated

Automated or point-of-care NCS devices are limited and do not replace standard NCS performed by trained clinicians; use automated devices only for screening and correlate with standard NCS when results are abnormal or inconclusive.

• Automated devices perform limited distal-only testing and lack on-site EMG integration.
• Abnormal or inconclusive automated device results should prompt standard NCS and clinical correlation.

Preoperative CTS testing should be within 12 months

For patients undergoing carpal tunnel release, ensure electrodiagnostic testing was performed within 12 months prior to surgery unless medical, patient, or system exceptions apply.

• Preoperative EDX within 12 months is recommended to confirm diagnosis and assess severity.
• Document any applicable exceptions if testing falls outside the 12‑month window.

Obtain routine labs before advanced DSP testing

Before advanced testing for suspected distal symmetric polyneuropathy (DSP) of unknown cause, obtain routine laboratory screening including CBC, CMP, vitamin B12, serum protein electrophoresis with immunofixation, fasting glucose and glucose tolerance testing.

• Order CBC, comprehensive metabolic panel, B12, SPEP with immunofixation, fasting glucose and glucose tolerance test prior to or concurrent with EDX.
• Reserve EDX for cases where routine testing does not identify an etiology or when clinical features warrant electrophysiologic study.

Submit full EDX report and consider attaching waveforms

Submit a full EDX report that includes all tests performed with tabulated NCS and EMG data; forwarding NCS waveforms is encouraged to support interpretation.

• Include data summary tables for NCS (temperature, type, side/nerve, stimulation/recording sites, amplitudes, latencies, conduction velocities, reference values).
• Include EMG data (side, muscles tested, activity data at rest and with activation), probable diagnosis/location, study limitations, prior study information, and signature with time stamp.

Attach PT documentation to show prior treatment failure for radiculopathy

For radiculopathy, confirm prior physical therapy failure with PT notes or member claims history when submitting EDX requests; include documentation of prior treatments.

• PT documentation must reflect at least 6 weeks of in-person therapy within the past year.
• Attach PT notes or claims history to support medical necessity for EDX.

Prepare and sign on-site EDX reports with full interpretation

Reports must be prepared on-site by the examiner and include interpretation, NCV calculations (and F‑wave indices when performed), comparison to normal values, clinical summary, differential diagnosis, and documentation of waveform review and technique adjustments during the encounter.

• Ensure on-site, real-time review of waveforms and record technique adjustments in the report.
• Include clinical summary, probable diagnosis/location, study limitations, and physician interpretation.

Provide supplemental justification when testing exceeds limits

When testing exceeds recommended limits, provide supplemental documentation that explains the clinical rationale, differential diagnoses considered, study design and duration (typically ≥30 minutes), and why additional tests were necessary.

• Document why extra studies were required and any changes in working diagnosis during the encounter.
• Include study duration and technical details supporting expanded testing.

Document point-of-care sural NCS results and limitations

When a point-of-care automated sural NCS device (e.g., NC-stat DPNCheck) is used, document device results, device limitations, and correlate findings with clinical examination; abnormal or inconclusive results should prompt standard NCS.

• Record device-measured SNAP/SNCV values and note that POC devices may rule out neuropathy but do not confirm definitive diagnosis alone.
• If results are abnormal or inconsistent with clinical findings, obtain standard NCS and include correlation in the report.

Include required elements in the EDX report

EDX reports must include patient demographics, reason for referral, history and physical exam description, detailed tabulated NCS and EMG findings, study limitations, probable diagnosis and location, prior study information, and a signature with time stamp.

• Provide tabulated NCS data (temperature, study type, side/nerve, recording/stimulation sites, amplitudes, latencies, conduction velocities, reference values).
• Include EMG side/muscles tested and activity data (rest and voluntary activation) and a clear probable diagnosis.

Ensure completeness of EDX report elements

EDX reports should be complete and include the full set of required elements (demographics, referral reason, history/exam, tabulated NCS/EMG data, study limitations, probable diagnosis, prior study info, and signature with time stamp) to avoid administrative rejection or denial.

• Prefer tabular format for NCS and EMG data rather than narrative.
• Ensure signature with time stamp is present on the report.

Document medical necessity per CPB

Providers are responsible for documenting and supporting medical necessity consistent with Aetna Clinical Policy Bulletins; include sufficient clinical information to justify testing and treatment decisions.

• Clinical documentation should align with CPB criteria for the requested EDX tests.
• Maintain records that support the choice and extent of testing performed.

Do not request NCS without an approvable EMG request unless exception documented

NCS will not be approved without an approvable EMG request unless a documented approvable exception exists; NCS and EMG utilization may be subject to case review when deviating from established norms.

• Document any exceptions (e.g., coagulopathy) that waive the EMG requirement.
• Expect case review when utilization deviates from the Maximum Number of Studies Table.

Avoid coding/indication mismatches

Using CPT codes that are not within the covered code sets or coding tests for indications that do not meet the policy's selection criteria may trigger denial; ensure coding matches the documented clinical indication.

• Select CPT codes consistent with the diagnosis and the policy's covered code lists.
• Do not bill EMG add-on codes independently of an appropriate NCS code when required.

High utilization may prompt peer review and denial risk

Testing utilization that significantly exceeds established norms (for example above the 90th percentile) may prompt peer review and could result in denial or require supplemental justification.

• High utilization should be justified with clinical rationale and documented differential diagnoses.
• Peer review mechanisms may be implemented for outlier providers or cases.

Normal NCS does not exclude surgical benefit for ulnar nerve; pursue further testing if abnormal

Normal NCS findings do not necessarily preclude benefit from ulnar nerve decompression; if ulnar sensory or motor NCSs are abnormal, perform additional NCSs to exclude a diffuse process per AANEM guidance.

• If ulnar NCS are abnormal, obtain further studies to rule out diffuse neuropathy.
• Recognize that patients with clinical ulnar nerve compression may still benefit from surgery despite normal NCS.

EDX report must contain all required elements

Ensure EDX reports are complete and include all required elements (demographics, referral reason, history/exam, tabulated NCS/EMG data, study limitations, probable diagnosis, prior study info, signature with time stamp) to support medical necessity and avoid administrative issues.

• Prefer tabular presentation of NCS and EMG data and include reference values and limb temperatures.
• Include study limitations and prior study comparisons where relevant.

Document paraspinal rationale and number of muscles tested to avoid coding risks

If paraspinal muscles are not assessed when clinically indicated, document the rationale; also document the number of muscles tested since failure to do so may lead to incorrect billing or denial—EMG add-on codes may not be billed independent of an NCS code.

• When a complete limb study omits paraspinals for contraindication, document the reason.
• Record the number of muscles tested to justify the billed EMG code group.

Administrative note: CPB use and potential plan effects

Clinical Policy Bulletins are intended to assist in administering plan benefits and do not constitute a contract; lack of adherence to published clinical policy may affect coverage determinations.

• Providers remain responsible for medical advice and treatment; CPBs guide benefit administration but are not guarantees of coverage.
• Policies may be updated; verify current policy at time of service.

EDX report submission requirements and encouraged attachments

Submit a full EDX report including all tests performed with tabulated data and consider attaching NCS waveforms; the report should contain demographics, reason for referral, history/exam, tabulated NCS and EMG findings, probable diagnosis, study limitations, prior study info, and signature with time stamp.

• Forwarding NCS waveforms is encouraged to support interpretations.
• Prefer tabular formats for both NCS and EMG data and include limb temperatures and reference values.