Sensory Nerve Conduction Threshold Tests (sNCTs) — NCD 270 | CMS Coverage Update

TL;DR: The Centers for Medicare & Medicaid Services modified NCD 270 governing sensory nerve conduction threshold tests (sNCTs), with an effective date of January 9, 2026. The position is unchanged — sNCT remains noncovered for Medicare — but your billing team needs to understand exactly why and what that means for claim denial exposure.

This update confirms that CMS sNCT coverage policy under NCD 270 in the CMS policy system continues to exclude all sNCT procedures from Medicare reimbursement. No specific CPT or HCPCS codes are listed in this policy document. That absence creates its own billing challenge, which we'll cover below.

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Quick-Reference Table

Field	Detail Copy
Payer	CMS (Centers for Medicare & Medicaid Services)
Policy	Sensory Nerve Conduction Threshold Tests (sNCTs)
Policy Code	NCD 270
Change Type	Modified
Effective Date	2026-01-09
Impact Level	Medium — affects neurology, neurosurgery, pain management, and physical medicine billing teams
Specialties Affected	Neurology, pain management, physical medicine & rehabilitation, neurosurgery
Key Action	Audit your charge capture and claim history for sNCT procedures — any claim submitted for sNCT testing against Medicare is noncovered and will deny

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CMS Sensory Nerve Conduction Threshold Test Coverage Criteria and Medical Necessity Requirements 2026

The short version: there are no covered indications. CMS does not recognize sNCT as meeting medical necessity under Medicare. That has been true since April 1, 2004, and this 2026 update to NCD 270 reaffirms that position.

Here's the clinical background you need to explain this to providers. The sNCT is a psychophysical assessment of both central and peripheral nerve function. It measures the detection threshold of calibrated sensory stimuli. The procedure is designed to evaluate and quantify function in both large and small caliber fibers to detect neurologic disease.

CMS distinguishes sNCT from other nerve studies. It is different from nerve conduction velocity, amplitude, and latency testing. It is also different from short-latency somatosensory evoked potentials — procedures that carry separate coverage rules.

CMS first noncovered sNCT effective October 1, 2002. The agency found insufficient scientific or clinical evidence to consider the test and the devices used to perform it reasonable and necessary under section 1862(a)(1)(A) of the Social Security Act.

Then came a reconsideration. Effective April 1, 2004, CMS reviewed the evidence again and reached the same conclusion. Whether the device is a "current output" type — used for current perception threshold (CPT), pain perception threshold (PPT), or pain tolerance threshold (PTT) testing — or a "voltage input" type used for voltage-nerve conduction threshold (v-NCT) testing, none of it clears the medical necessity bar.

CMS coverage policy under NCD 270 does not distinguish by device type, testing method, or clinical indication. All uses of sNCT to diagnose sensory neuropathies or radiculopathies are noncovered. Full stop.

There are no prior authorization pathways here because there is no coverage pathway. You cannot get prior authorization for a noncovered service and use that as a shield against denial. If a provider performs sNCT on a Medicare patient and bills it, the claim will deny. The only exception is an Advance Beneficiary Notice of Noncoverage (ABN) — more on that in the billing guidelines section.

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CMS sNCT Exclusions and Non-Covered Indications

This is the core of NCD 270, and it is unusually broad. Most NCDs have a covered indications list and a noncovered indications list. NCD 270 has only noncovered indications.

CMS excludes all sNCT uses for diagnosing sensory neuropathies. CMS excludes all sNCT uses for diagnosing radiculopathies. There are no carved-out indications, no approved patient populations, and no covered diagnostic scenarios.

The policy covers both major sNCT device categories:

Current output devices — used for:

#	Excluded Procedure Copy
1	Current perception threshold (CPT) testing
2	Pain perception threshold (PPT) testing
3	Pain tolerance threshold (PTT) testing

Voltage input devices — used for:

#	Excluded Procedure Copy
1	Voltage-nerve conduction threshold (v-NCT) testing

If your neurology or pain management group uses any of these device types to test Medicare beneficiaries, those claims have no path to reimbursement under this coverage policy.

The real risk here is not confusion about what's covered — the policy is clear. The risk is provider education. Neurologists who trained on sNCT equipment and believe it has clinical value may not know CMS has maintained this noncoverage position for over 20 years. That gap between clinical practice and Medicare billing guidelines creates exposure.

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Coverage Indications at a Glance

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CMS sNCT Billing Guidelines and Action Items 2026

This policy has been noncovered since 2004. But the January 9, 2026 modification date means CMS has touched this policy again — and that's your prompt to act. Here's what to do now.

1. Audit your charge capture for sNCT procedures before February 2026.

Pull claims from the last 24 months for any sNCT-related procedures billed to Medicare. If you find submitted claims, check their status. Approved claims for noncovered services can trigger post-payment audits and recoupment requests. Know what's in your history before a Medicare Administrative Contractor does.

2. Identify which providers in your group use sNCT equipment.

This is a provider education problem as much as a billing problem. Neurologists, pain management physicians, and physiatrists may still use sNCT devices clinically and assume billing will follow. Sit down with those providers and show them NCD 270. The effective date of April 1, 2004 for noncoverage has not changed — but the January 9, 2026 modification date confirms CMS has reviewed this and held the line.

3. Issue Advance Beneficiary Notices (ABNs) if providers will continue performing sNCT.

If a provider believes sNCT has clinical value for a Medicare patient and will perform the test regardless of coverage, you need an ABN in place before the service. The ABN shifts financial responsibility to the patient. Without one, your practice absorbs the cost of a denied claim. This is not optional — it is your only reimbursement protection for this procedure.

4. Confirm your MAC's local coverage determinations (LCDs) don't add complexity.

NCD 270 is a national coverage determination, meaning it applies everywhere. But your Medicare Administrative Contractor may have related LCDs covering nerve conduction studies or neurological testing that interact with how sNCT claims get processed. Check with your MAC to confirm there are no regional nuances that affect your sNCT billing guidelines.

5. Do not bill related nerve conduction studies as sNCT and expect different results.

CMS explicitly distinguishes sNCT from nerve conduction velocity, amplitude, and latency testing. Those procedures carry separate coverage rules and are not governed by NCD 270. But conflating them — billing an sNCT procedure under a covered nerve conduction code — is upcoding. It is a compliance risk, not a billing workaround. If you're unsure how to code a specific nerve study, talk to your compliance officer before the claim goes out.

6. Update your payer policy documentation.

Mark January 9, 2026 as the modified date in your internal policy tracking. This is a confirmed active policy, not a legacy document. Any internal billing guidelines that reference sNCT coverage should reflect that NCD 270 was reviewed and reaffirmed in 2026.

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CPT, HCPCS, and ICD-10 Codes for sNCT Under NCD 270

This is a critical gap in the policy document: NCD 270 does not list specific CPT or HCPCS codes. CMS describes the noncovered procedures in clinical terms — sNCT devices, current perception threshold testing, pain perception threshold testing, pain tolerance threshold testing, and voltage-nerve conduction threshold testing — but does not map those descriptions to specific procedure codes.

That creates a real sNCT billing problem. Without explicit codes in the NCD, your billing team has to rely on other sources to identify the right codes and confirm their noncoverage status. This is not unusual for older NCDs, but it does mean more legwork.

What to Do When Codes Aren't Listed

Start with your MAC. Medicare Administrative Contractors sometimes publish claims processing instructions or local guidance that maps clinical procedures from a national NCD to specific billing codes. CMS lists a "Claims Processing Instructions" cross-reference in NCD 270 — your MAC is the place to follow that thread.

Also check the CMS Coverage Database directly. The full NCD 270 record may link to associated billing code lists that are not reproduced in every policy summary. Your compliance officer or a billing consultant with Medicare specialty experience can pull those details faster than rebuilding the code mapping from scratch.

Do not guess codes. Do not use a related nerve conduction code and assume it's close enough. The compliance exposure from incorrectly coding a noncovered procedure — especially one with a 20-year noncoverage history — is not worth the revenue.

No Codes Available from This Policy Document

Code Type	Status Copy
CPT	Not listed in NCD 270 policy document
HCPCS	Not listed in NCD 270 policy document
ICD-10-CM	Not listed in NCD 270 policy document

If your revenue cycle team needs the specific procedure codes associated with sNCT testing, contact your MAC or pull the claims processing cross-reference linked in the official NCD 270 document on the CMS Coverage Database.

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