CPT® Code 95938

Last Updated: January 2026 | Verified for 2026 AMA, CPT & CMS Guidelines

Key Takeaways (Read This First)

• 95938 is not an EMG/NCS “bundle” code in CPT: The AMA descriptor for CPT 95938 is a bilateral short-latency somatosensory evoked potential (SSEP) study of upper and lower limbs, which is a neurophysiology evoked potential test—not a needle EMG and nerve conduction study service

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• Correct EMG/NCS coding in 2026 is typically: one NCS code from 95907–95913 (selected by number of studies performed) plus EMG add-on code(s) 95885–95887 when an EMG is performed on the same date . Payer policies frequently evaluate the reasonableness

of the number of nerves/muscles tested, so accuracy in counting “studies” and documenting targets is essential .

• Documentation is what makes claims defensible: Audit-proof EMG/NCS documentation generally includes (1) medical necessity and clinical question, (2) nerves and muscles tested, (3) modalities (sensory/motor, F-waves, H-reflex if applicable), (4) quantitative NCS values (latency/amplitude/conduction velocity), (5) EMG findings per muscle, and (6) a clinical impression that links results to the suspected diagnosis .
• Modifiers matter: Use -26 (professional) and -TC (technical) when billing must be split between a facility and interpreting physician (common in hospitals) and bill globally with no modifier when one entity provides both components, consistent with Medicare billing frameworks

. Use -25 on E/M when a separately identifiable visit occurs the same day, and use

-59 (or the more specific subset modifier) only when you must indicate a truly distinct diagnostic service beyond an edit .

This article clarifies a persistent real-world confusion: some clinicians and billing teams informally refer to “95938” when they mean a comprehensive electrodiagnostic evaluation (needle EMG plus extensive nerve conduction studies). However, under the AMA CPT code descriptor, CPT 95938 is an evoked potential (SSEP) procedure, not an EMG/NCS code . If your goal is to bill a same-day EMG with multiple NCS, the compliant path is to code the NCS with one code from 95907–95913 based on the total number of studies and then add the appropriate EMG add-on code(s) 95885–95887 when needle EMG is performed on the same date

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Because electrodiagnostic testing is heavily policy-driven, this guide focuses on what payers and auditors typically look for: clear medical necessity, accurate study counts, correct use of add-on structure, and correct component billing. Coverage and documentation expectations are described in both Medicare guidance and major payer medical policies .

1. What CPT 95938 Actually Is (and Why It’s Confused)

The authoritative CPT descriptor for 95938 describes a bilateral SSEP study of upper and lower limbs

. SSEPs are neurophysiologic tests measuring conduction along sensory pathways from peripheral

nerves through the spinal cord to cortical responses. They are commonly used in certain neurologic evaluations and can be used in intraoperative contexts, depending on the monitoring configuration and coding rules in effect for the service being provided.

Why the confusion exists: many comprehensive EMG/NCS evaluations in complex neuropathy or radiculopathy workups do involve testing multiple limbs and multiple nerves and muscles. This “four-limb comprehensive study” concept can resemble the “upper and lower limbs, bilateral” wording people see attached to 95938. However, the test modality is different. EMG/NCS are electrodiagnostic studies focused on muscle electrical activity (needle EMG) and peripheral nerve conduction (NCS), whereas 95938 is an evoked potential pathway study

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Compliance risk: Billing 95938 to represent EMG/NCS services can create a mismatch between the billed CPT descriptor and the test actually performed. If an auditor compares the report to the descriptor, the claim can be denied or recouped. The safer approach is to bill EMG/NCS with the correct EMG add-on code(s) plus the single correct NCS code based on study count, and reserve 95938 for the SSEP procedure described by CPT .

2. Correct EMG/NCS Coding in 2026 (95885–95887 + 95907–95913)

Most payer policies and Medicare guidance describe EMG/NCS in a structured way: you select exactly one NCS code from 95907–95913 per patient per day (based on the total number of studies performed that day) and you add the EMG add-on code(s) 95885 (limited) or 95886 (complete) per extremity when needle EMG is performed in conjunction with NCS on that date.

2.1 Selecting the correct NCS code (95907–95913)

The 95907–95913 family is chosen by the number of studies performed. Medicare guidance and payer policies emphasize that the study count is not simply “number of nerves,” but rather the number of discrete conduction tests, which may include sensory and motor evaluations and certain late responses when performed and counted under the policy framework.

In practice, coders should use the same counting method consistently and ensure the report structure makes the count transparent.

Key billing concept: report only one NCS code per day (for example, 95909 for 5–6 studies or 95911 for 9–10 studies). Payer policies treat these as a single “bucket” code representing the day’s NCS volume .

2.2 Selecting the correct EMG add-on code (95885 vs 95886) and when 95887 applies

When NCS are performed on the same date as needle EMG, AMA/CPT coding structure (as reflected in billing education and Medicare guidance) requires using the add-on EMG codes rather than the older standalone extremity EMG codes

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• 95885 is used for a limited extremity EMG (commonly framed as testing up to four muscles in the extremity).
• 95886 is used for a complete extremity EMG (commonly framed as testing five or more muscles with appropriate breadth of innervation/spinal levels), and it includes “related paraspinal areas, when performed” within the extremity exam structure

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• 95887 is an add-on code for needle EMG of non-extremity muscles when performed with NCS (used in defined scenarios; do not double-bill paraspinals if they are included as “related paraspinal areas” in an extremity EMG code)

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Many payer policies explicitly define indications and limitations for EMG/NCS and expect that the needle EMG component is not superficial.

For example, policies describing EMG/NCS medical necessity often highlight that NCS without needle EMG may provide incomplete information for many diagnostic questions, reinforcing that combined testing should be clinically purposeful and documented .

3. Audit-Proof Documentation Checklist

Documentation is the primary determinant of whether electrodiagnostic claims survive audit. Medicare billing guidance and major payer medical policies consistently emphasize complete reporting: what was tested, how it was tested, quantitative values, and an interpretive impression tied to the clinical question .

3.1 Minimum documentation elements auditors expect

• Clinical indication and question: symptoms and duration, relevant exam findings, and what diagnosis is being ruled in/out.
• Order/referral alignment: the ordering clinician and the reason the study will change management.
• Nerves tested + modalities: sensory vs motor, and any late responses performed (F-waves, H-reflex) described clearly.
• Quantitative NCS values: latencies, amplitudes, conduction velocities (and temperature control notes when relevant).
• Muscles tested in needle EMG: list each muscle, note insertional activity, spontaneous activity, MUAP morphology, recruitment.
• Interpretation/impression: a concise statement that links findings to diagnosis and severity and localizes pathology.

3.2 A practical “audit-proof” reporting pattern

A report format that routinely performs well in reviews is a two-part structure:

• NCS table showing each nerve, modality, segment, and values (with reference ranges where your lab uses them), followed by a short narrative interpretation.
• Needle EMG table listing each muscle, innervation/root level, spontaneous activity, MUAP characteristics, and recruitment, followed by overall impression. Medicare guidance explicitly discusses documentation expectations for these services, and payer medical policies often mirror these requirements .

In addition, the AANEM recommended policy provides utilization expectations and emphasizes appropriate study design and documentation in the context of clinical indications and repeat testing .

4. Modifiers: 26, TC, 25, 59 (and When Not to Use Them)

4.1 -26 and -TC (professional vs technical components)

Electrodiagnostic procedures are frequently billed as either global services (one entity provides equipment and interpretation) or split services (technical billed by the facility; professional billed by the interpreting physician). Medicare billing guidance commonly addresses the component billing framework and supervision expectations for diagnostic tests

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• Global: No modifier when one billing entity provides both performance/equipment and interpretation/reporting.
• Professional component: Append -26 when billing only interpretation/report.
• Technical component: Append -TC when billing only equipment/technician portion (facility billing pattern). If both a facility and a physician bill globally for the same date of service, duplicate payment edits and denials are common. Split billing avoids that conflict but requires that the record clearly supports who provided which component.

4.2 -25 for same-day E/M

An E/M service may be billed the same day as EMG/NCS when it is separately identifiable and not merely the pre-test assessment.

Payer medical policies commonly require clear documentation of distinct history/exam/decision-making separate from the procedure note . In that case, append -25 to the E/M code. Without clear separation, the E/M is vulnerable to denial or downcoding.

4.3 -59 and NCCI edits (use only when truly distinct)

The CMS NCCI manual describes when modifier 59 (or a subset modifier) may be used to identify a distinct diagnostic procedure that is otherwise bundled under an edit, and it warns against routine modifier use without a true distinct-service rationale .

For EMG/NCS, the standard pairing of one NCS code plus appropriate EMG add-on code(s) is usually payable without modifier 59. Modifier 59 becomes relevant only in unusual circumstances (separate session, different anatomic site where policy requires distinction, or documented independent

diagnostic service beyond what an edit assumes).

5. ICD-10 Medical Necessity Patterns and Coverage Expectations

Coverage is diagnosis- and context-dependent. Major payer policies and Medicare articles describe covered indications and limitations for EMG/NCS, and they typically emphasize that the test should answer a specific diagnostic question and influence management .

Common high-support indications (examples)

• Carpal tunnel syndrome (e.g., G56.01/G56.02/G56.03): classic indication to localize and grade median neuropathy at the wrist .
• Radiculopathy (e.g., M54.12, M54.16): EMG helps differentiate radiculopathy vs peripheral entrapment or plexopathy .
• Polyneuropathy (e.g., E11.42, G62.9): multi-nerve/multi-limb testing often clinically appropriate, and documentation should show why the scope was necessary

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• Focal mononeuropathies (ulnar neuropathy, peroneal neuropathy, etc.): localization and severity assessment .
• Motor neuron disease (ALS) (G12.21) and complex neuromuscular conditions: extensive studies and defined repeat testing patterns may be medically appropriate; repeat frequency should be justified and consistent with professional recommendations

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Payers often deny EMG/NCS for nonspecific complaints (diffuse pain without neurologic findings, routine screening) and may require clear clinical deficits or failure of conservative therapy for certain entrapment syndromes .

For repeat studies, professional recommendations and Medicare contractor approaches commonly expect a documented change in clinical status or a specific management question (pre-surgery reassessment, disease progression monitoring, new distribution of symptoms) .

6. Real-World Coding Scenarios

Scenario A: Unilateral carpal tunnel workup

Clinical: Right hand numbness with positive provocative testing.

Testing: NCS totals 3–4 studies; needle EMG of right upper extremity includes ≥5 muscles.

Coding approach: One NCS code for the day (e.g., 95908 if 3–4 studies) plus 95886 (complete extremity EMG) for the right arm.

Documentation focus: include median motor and sensory values (latency/amplitude) and EMG findings in median-innervated muscles,

then correlate to “median mononeuropathy at the wrist” impression.

Policy alignment: Typical covered indication and reporting expectations appear in Medicare guidance and payer medical policy

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Scenario B: Diabetic polyneuropathy with four-limb testing and same-day E/M

Clinical: Long-standing diabetes with distal sensory loss and gait imbalance.

Testing: NCS totals 9–10 studies; EMG includes complete exams in multiple extremities.

Coding approach: One NCS code matching count (e.g., 95911 for 9–10 studies) plus 95886 per extremity examined (up to four units).

If a separately identifiable new-patient evaluation occurs the same day, bill an E/M code with modifier -25.

Documentation focus: for -25, clearly separate the E/M note (history/exam/assessment/plan) from the procedure report.

For the test, present NCS/EMG tables and an impression consistent with length-dependent polyneuropathy.

Utilization notes: repeat testing should be justified if performed frequently; AANEM recommendations discuss reasonable repeat patterns .

Scenario C: Cervical radiculopathy; paraspinals tested

Clinical: Neck pain with dermatomal symptoms and weakness suggesting C7 involvement.

Testing: NCS 5–6 studies; EMG of right upper extremity includes ≥5 muscles and includes related cervical paraspinals.

Coding approach: One NCS code (e.g., 95909 for 5–6 studies) plus 95886 for the right upper extremity.

Do not separately bill paraspinal EMG if it is included as “related paraspinal areas when performed” within the extremity EMG service structure.

Rules support: Medicare documentation and policy and payer coverage expectations describe this typical combined testing pattern

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Scenario D: Repeat study within 12 months

Clinical: Post-surgical patient returns with new or worsened symptoms eight months after a prior EMG/NCS.

Coding approach: Code the repeat study the same way as the initial (correct NCS bucket code + appropriate EMG add-ons). Typically no special modifier is required solely because it is a repeat on a different date, but the record should explicitly justify why repeat testing changes management (recurrence, new distribution, pre-op planning, progression).

Coverage reality: repeat frequency expectations are addressed in professional recommendations and are often reflected in payer review behavior .

7. Related Codes Reference Table (Clean and Practical)

Bottom line: if your clinical service is “EMG plus multiple NCS,” code it as an NCS bucket code (95907–95913) plus the correct EMG add-on code(s) (95885–95887). Reserve 95938 for the evoked potential SSEP procedure defined by CPT. This alignment between the performed test and the billed descriptor

is the foundation for passing payer edits and post-payment reviews.