CurrentBlue Cross Blue Shield - MassachusettsPolicy 701

Electrodiagnostic Assessment (EMG/NCS) Coverage Criteria

Defines medical necessity, investigational uses, and prior authorization expectations for electromyography (EMG), nerve conduction studies (NCS), and related electrodiagnostic testing for commercial members.

Policy Summary

PayerBlue Cross Blue Shield - Massachusetts

PolicyElectrodiagnostic Assessment (EMG/NCS) Coverage Criteria

Policy CodePolicy 701

Change TypeNo material changes

Effective DateN/A

Next Review DateN/A

Key ActionDocument signs and symptoms and confirm that definitive diagnosis cannot be made by physical exam and imaging alone; ensure medical necessity criteria are met for listed CPT codes.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

701 / 2.01.95policy identifiers

No PA requiredoutpatient PA stance

Investigationalinvestigational when not met

Multiple CPTsprocedure coding

<50% (varies)reported sensitivity

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Coverage and Medical Necessity Criteria

Initial electrodiagnostic testing (medical necessity)

Electrodiagnostic assessment (EMG/NCS) is considered MEDICALLY NECESSARY when ALL of the following are met:

Indications and prerequisites: Signs and symptoms of peripheral neuropathy and/or myopathy are present; AND work-up for one or more listed diagnostic categories is indicated; AND a definitive diagnosis cannot be made by physical exam and imaging studies alone.

List of diagnostic categories includes compressive neuropathies; traumatic nerve injuries; nerve root compression; generalized and focal neuropathies/myopathies; plexopathies; neuromuscular junction disorders; carpal tunnel syndrome; ulnar nerve entrapment; tarsal tunnel syndrome; thoracic outlet syndrome; other peripheral nerve entrapments; cervical nerve root compression; and additional specific diagnoses listed in policy.

Repeat electrodiagnostic testing

Repeat electrodiagnostic assessment may be considered MEDICALLY NECESSARY when ANY of the following are met:

Repeat testing criteria: Interim progression of disease following an initial test that was inconclusive such that a repeat test is likely to elicit additional findings; OR development of new symptoms or signs suggesting a second diagnosis in an individual who has received an initial diagnosis; OR unexpected change(s) in the course of disease or response to treatment suggesting the initial diagnosis may be incorrect and reexamination is indicated.

Investigational / Not medically necessary uses

Investigational / Not covered situations: Screening of asymptomatic individuals; serial assessments to evaluate progression of disease in an individual with a previously diagnosed neuropathy or myopathy; evaluation of severity of disease in a patient with previously diagnosed neuropathy or myopathy; evaluation of treatment response in an individual with previously diagnosed neuropathy or myopathy.

These situations are considered investigational when the medical necessity criteria are not met.

Intraoperative EMG

EMG may be considered medically necessary as part of intraoperative neurophysiologic monitoring when it meets policy #211 criteria:

Intraoperative use: Intraoperative EMG is medically necessary if it fits criteria specified in policy #211 (see that policy for details and CPT coding guidance).

Cross-reference to policy #211 for specifics.

Coverage contingent on meeting medical necessity criteria for listed CPT codes

Covered when ALL of the following are met

Coverage prerequisite: The medical necessity criteria in the policy must be met for the listed CPT codes to be covered for Commercial Members (Managed Care, PPO, and Indemnity).

When utilizing electromyography for intraoperative neurophysiologic monitoring, one of the CPT codes in Section A must be used in conjunction with an intraoperative monitoring CPT code per policy #211. Providers should report all services using current procedure and diagnosis codes; inclusion or exclusion of a code does not itself determine member coverage—refer to the member contract.

Electrodiagnostic testing (EMG/NCS) is not intended for routine screening of people without signs or symptoms. Specifically, the policy considers testing investigational and not appropriate when used for screening of asymptomatic individuals or for serial assessments solely to document progression, severity, or treatment response in a person with a previously diagnosed neuropathy or myopathy. These uses are listed among investigational exclusions and are not covered when the policy's medical necessity criteria are not met.

Listing a CPT or ICD code in this policy is informational only and does not by itself guarantee coverage or payment. Inclusion or exclusion of a code does not constitute member coverage or provider reimbursement; actual coverage depends on the member's contract benefits in effect at the time of service and on whether the policy's medical necessity criteria are met for the procedure.

Electrodiagnostic assessment, including EMG and NCS, is considered investigational (not covered) when the policy's stated medical necessity criteria are not satisfied. The policy explicitly lists examples of such investigational uses (e.g., screening asymptomatic individuals, serial assessments to evaluate progression, evaluation of severity or treatment response in previously diagnosed disease).

The available evidence for EMG/NCS is limited and heterogeneous. Studies are generally small and observational across a few conditions; reported sensitivities vary widely and are often less than 50%, while specificity is expected to be higher but imprecisely estimated. Because of these limitations, the policy concludes that the evidence is insufficient to determine that electrodiagnostic testing improves health net outcome for some indications.

Procedure and Diagnosis Codes

Covered CPT CodesCPTCovered

95860	Needle electromyography; extremity with or without related paraspinal areas
95861	Needle electromyography; 2 extremities with or without related paraspinal areas
95863	Needle electromyography; 3 extremities with or without related paraspinal areas
95864	Needle electromyography; 4 extremities with or without related paraspinal areas
95865	Needle electromyography; larynx
95866	Needle electromyography; hemidiaphragm
95867	Needle electromyography; cranial nerve supplied muscle(s) unilateral
95868	Needle electromyography; cranial nerve supplied muscles bilateral
95869	Needle electromyography; thoracic paraspinal muscles (excluding T1 or T12)
95870	Needle electromyography; limited study of muscles in 1 extremity or non-limb (axial) muscles

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Covered CPT Codes (continued)CPTCovered

95860	Needle electromyography; extremity with or without related paraspinal areas
95861	Needle electromyography; 2 extremities
95863	Needle electromyography; 3 extremities
95864	Needle electromyography; 4 extremities
95870	Needle electromyography; limited study
95872	Single fiber EMG
95885	Needle EMG each extremity, limited with nerve conduction
95886	Needle EMG each extremity, complete with nerve conduction
95887	Needle EMG non-extremity muscles with nerve conduction
95907	Nerve conduction studies; 1-2 studies

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ICD-10 Diagnosis Codes (selected examples)ICD-10Covered

S44.51XA	Injury of cutaneous sensory nerve at shoulder and upper arm level, right arm, initial encounter
S44.52XA	Injury of cutaneous sensory nerve at shoulder and upper arm level, left arm, initial encounter
S44.92XS	Injury of unspecified nerve at shoulder and upper arm level, left arm, sequela
S54.21XD	Injury of radial nerve at forearm level, right arm, subsequent encounter
S54.21XS	Injury of radial nerve at forearm level, right arm, sequela
S54.22XA	Injury of radial nerve at forearm level, left arm, initial encounter
S54.22XD	Injury of radial nerve at forearm level, left arm, subsequent encounter
S54.22XS	Injury of radial nerve at forearm level, left arm, sequela
S54.30XD	Injury of cutaneous sensory nerve at forearm level, unspecified arm, subsequent encounter
S54.30XS	Injury of cutaneous sensory nerve at forearm level, unspecified arm, sequela

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ICD-10 Diagnosis Codes (partial) - Hip/Thigh/Lower ExtremityICD-10Covered

S74.10XA	Injury of femoral nerve at hip and thigh level, unspecified leg, initial encounter
S84.02XA	Injury of peroneal nerve at lower leg level, left initial encounter
S84.02XD	Injury of peroneal nerve at lower leg level, left subsequent encounter
S84.02XS	Injury of peroneal nerve at lower leg level, left sequela
S94.31XA	Injury of cutaneous sensory nerve at ankle and foot level, right initial encounter
S94.31XD	Injury of cutaneous sensory nerve at ankle and foot level, right subsequent encounter
S94.31XS	Injury of cutaneous sensory nerve at ankle and foot level, right sequela
S94.32XA	Injury of cutaneous sensory nerve at ankle and foot level, left initial encounter
S94.32XD	Injury of cutaneous sensory nerve at ankle and foot level, left subsequent encounter
S94.32XS	Injury of cutaneous sensory nerve at ankle and foot level, left sequela

ICD-10 Diagnosis Codes — peripheral nerve injuries, ankle/foot (continued)ICD-10Covered

S94.8X1A	Injury of other nerves at ankle and foot level, right leg, initial encounter
S94.8X1D	Injury of other nerves at ankle and foot level, right leg, subsequent encounter
S94.8X1S	Injury of other nerves at ankle and foot level, right leg, sequela
S94.8X2A	Injury of other nerves at ankle and foot level, left leg, initial encounter
S94.8X2D	Injury of other nerves at ankle and foot level, left leg, subsequent encounter
S94.8X2S	Injury of other nerves at ankle and foot level, left leg, sequela
S94.8X9A	Injury of other nerves at ankle and foot level, unspecified leg, initial encounter
S94.8X9D	Injury of other nerves at ankle and foot level, unspecified leg, subsequent encounter
S94.8X9S	Injury of other nerves at ankle and foot level, unspecified leg, sequela
S94.90XA	Injury of unspecified nerve at ankle and foot level, unspecified initial encounter

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Provider Responsibilities and Billing Notes

Prior Authorization

Prior Authorization Required for Inpatient; Outpatient Not Required

For services described in this policy, precertification/preauthorization is REQUIRED for procedures performed in the inpatient setting. For outpatient procedures, prior authorization is not required for Commercial Managed Care (HMO and POS), PPO, and Indemnity products.

Inpatient procedures: precertification/preauthorization required for all products.
Outpatient procedures: prior authorization is not required for Commercial Managed Care (HMO and POS), Commercial PPO, and Indemnity.

Note

Prior Authorization Not Specified for Listed ICD-10 Codes

Some chunks of the source list diagnosis (ICD-10) codes and code tables without specifying any prior authorization or precertification requirements. Inclusion of diagnosis codes in these lists does not by itself indicate that prior authorization is required.

ICD-10 code listings are provided for informational use; no explicit prior authorization instructions are specified with those codes.

Background and Rationale

Electromyography (EMG) and nerve conduction studies (NCS) are adjunctive, electrodiagnostic tests used when clinical examination and standard diagnostic studies are insufficient to make a definitive diagnosis. EMG evaluates muscle electrical activity via needle electrodes at rest and with voluntary contraction; NCS measure motor and sensory conduction parameters including velocity, amplitude, latency, and late responses. These studies help localize pathology, characterize severity and chronicity, and support diagnosis, prognosis, treatment selection, and monitoring of recovery, but they are complementary to—not replacements for—clinical assessment and imaging.

Definitions and Test Descriptions

Electromyography (EMG)

DefinitionElectromyography (EMG): needle electrode assessment of muscle electrical activity including observation at rest and during minimal and maximal contraction

Procedure componentsEvaluation includes observation at rest, action potentials with minimal voluntary contraction, and with maximum contraction

Clinical roleAdjunct to clinical evaluation to assess integrity and electrical function of muscles when exam and labs are inconclusive

Nerve conduction studies (NCS)

DefinitionNerve conduction studies (NCS): assessment of motor and sensory nerve conduction measuring velocity, amplitude, latency, and configuration

Includes late responsesLate responses (H‑reflex and F‑wave) evaluate proximal nerve segments such as nerve roots and anterior horn cells

Policy Revision History

2025-10-??clarification

Clarified coding information.

2025-08-??annual_review

Annual policy review; references updated; policy statements unchanged.

2024-10-??clarification

Clarified coding information.

Policy Summary

PayerBlue Cross Blue Shield - Massachusetts

PolicyElectrodiagnostic Assessment (EMG/NCS) Coverage Criteria

Policy CodePolicy 701

Change TypeNo material changes

Effective DateN/A

Next Review DateN/A

Key ActionDocument signs and symptoms and confirm that definitive diagnosis cannot be made by physical exam and imaging alone; ensure medical necessity criteria are met for listed CPT codes.

SourceLink

On This Page

Denial Risk

Investigational Uses That May Trigger Denial

Electrodiagnostic testing is considered INVESTIGATIONAL and may be denied when the medical necessity criteria are not met. Examples include screening asymptomatic individuals and serial assessments or routine monitoring of disease progression or treatment response in individuals with established neuropathy or myopathy.

Investigational (denial risk) examples: screening of asymptomatic individuals; serial assessments to evaluate progression of disease in a person with a previously diagnosed neuropathy or myopathy; evaluation of severity or treatment response for an already diagnosed neuropathy or myopathy.

Note

No Explicit Authorization/Denial Criteria in Some Code Lists

The policy includes medical necessity criteria for listed CPT codes and diagnostic categories; however, some sections enumerate ICD-10 codes or coding guidance without explicit authorization or denial criteria tied to individual codes. Coverage determinations remain subject to the member's contract and the medical necessity criteria in the policy.

Inclusion or exclusion of a code does not constitute coverage; refer to the member's contract benefits at time of service.
Medical necessity criteria specified elsewhere in the policy must be met for listed CPT codes to be covered.

Documentation Required

Clinical Documentation to Support Medical Necessity

Providers must document clinical findings that support the medical necessity of electrodiagnostic testing. Documentation should include signs and symptoms, relevant physical examination results, and the diagnostic work-up that makes testing necessary (e.g., imaging results, inconclusive exams, or new/worsening symptoms). Repeat testing should be supported by interim progression, new findings, or unexpected clinical changes as described in the policy.

Document signs and symptoms and results of physical exam and imaging that indicate testing is necessary.
For repeat electrodiagnostic assessment, document interim progression, new symptoms/signs, or unexpected changes indicating re-evaluation is needed.
Report all services using current procedure, revenue, and diagnosis codes and applicable modifiers.

Billing Rule

Diagnosis and Coding Guidance (Informational)

The policy's code and diagnosis listings are provided for informational and billing guidance only. Providers should report services using the most up-to-date industry-standard procedure, revenue, and diagnosis codes and modifiers. Inclusion of a code in the policy does not guarantee coverage or reimbursement.

Providers should use current CPT/HCPCS/ICD-10 codes and modifiers when reporting services.
Refer to the member contract to determine coverage; the code list is not exhaustive and does not by itself indicate coverage.

Note

No Documentation or Submission Requirements Specified for Some Code Lists

Some sections of the policy list ICD-10 diagnosis codes and encounter types without specifying documentation submission requirements or instructions for claims handling. When documentation requirements are not specified in the policy, providers should follow standard submission practices and the payer's general documentation guidelines.

ICD-10 code lists may lack explicit documentation or submission instructions in this policy excerpt.
Follow Blue Cross Blue Shield of Massachusetts general claims submission and documentation policies when specific requirements are not provided.

Clinical roleUsed with EMG to localize pathology, characterize severity and chronology of neuropathic processes

Single-fiber EMG / Repetitive nerve stimulation

Single‑fiber EMGNeedle electrode records single muscle fiber responses to assess jitter and fiber density

Repetitive nerve stimulationRepeated stimulation of a nerve with measurement of muscle response to assess neuromuscular junction function; decremental responses indicate NMJ disorder

IndicationSpecialized studies used when neuromuscular junction pathology or single‑fiber level detail is suspected

EMG/NCS as criterion standard for nerve and muscle electrical evaluation

Role as criterion standardElectrodiagnostic assessment (EMG/NCS) is considered the criterion standard for evaluating the electrical function of peripheral nerves and muscles

Complementary useProvides information to localize pathology, characterize distribution and severity, estimate chronology, and aid diagnosis/prognosis

LimitationsNo true alternative reference standard exists; tests are more specific than sensitive and normal results do not rule out disease

ICD-10 Diagnosis Codes — definition note

Definition noteSequential listing of ICD‑10 codes representing autonomic, neuropathic, spinal cord, cranial nerve injuries, radiculopathies, myopathies, pain locations, and related neurologic conditions as shown in the policy excerpt

Use in policyICD‑10 codes in the policy are provided to indicate diagnoses that may meet medical necessity when criteria are satisfied

Reference for documentationSelect the specific ICD‑10 code that best reflects the clinical diagnosis and encounter when submitting claims or requests

Encounter designations

Encounter designations includedMany ICD‑10 codes in the policy include encounter qualifiers: initial encounter (A), subsequent encounter (D), and sequela (S)

ApplicationChoose the qualifier that matches the patient's phase of care when assigning diagnosis codes for EMG/NCS services

Billing implicationEncounter qualifiers affect documentation of course of care and should align with clinical records for correct reporting

2024-08-??update

References added and policy background updated to reflect 2023 AANEM guidelines; policy statements unchanged.

2024-02-??clarification

Policy clarified to add statement regarding medical necessity for intraoperative neurophysiologic monitoring and cross-references to related policy #211 and CPT coding.

2023-08-??annual_review

Annual policy review with minor editorial refinements to policy statements; intent unchanged.

2022-10-??clarification

Clarified coding information.

2022-08-??annual_review

Annual policy review; description, summary, and references updated; policy statements unchanged.

2021-01-??administrative

Medicare information removed; see MP #132 for Medicare Advantage management references.

2020-12-??annual_review

Annual policy review; description, summary, and references updated; policy statements unchanged.

2020-10-??clarification

Clarified coding information.

2019-08-??annual_review

Annual policy review; description, summary, and references updated; policy statements unchanged.

2018-10-??clarification

Clarified coding information.

2018-07-01annual_review

Annual policy review; background information updated (effective 7/1/2017 noted in history).

2017-10-??clarification

Clarified coding information.

2017-07-??background_update

Background information corrected to remove somatosensory evoked potentials (effective 7/1/2017).

2016-10-??clarification

Clarified coding information.

2015-11-01new_policy

New medical policy describing medically necessary, not medically necessary, and investigational indications became effective.