Assessing Patient's Suitability for Electrical Nerve Stimulation Therapy — NCD 63 | CMS Coverage Update

TL;DR: The Centers for Medicare & Medicaid Services modified NCD 63, the national coverage determination governing electrical nerve stimulation therapy assessment, effective January 9, 2026. Here's what billing teams need to know.

This update to the CMS electrical nerve stimulation coverage policy clarifies payment rules for TENS and PENS procedures used to assess patient suitability for ongoing nerve stimulator therapy. The policy does not list specific CPT or HCPCS codes in the coverage document itself — more on what that means for your charge capture below. If your practice bills Medicare for pain management, physical therapy, or neurostimulation services, this policy directly affects your reimbursement and documentation requirements.

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Quick-Reference Table

Field	Detail Copy
Payer	Centers for Medicare & Medicaid Services (CMS)
Policy	Assessing Patient's Suitability for Electrical Nerve Stimulation Therapy
Policy Code	NCD 63
Change Type	Modified
Effective Date	2026-01-09
Impact Level	Medium
Specialties Affected	Pain Management, Physical Therapy, Neurology, Outpatient Hospital, Primary Care
Key Action	Audit documentation practices for TENS and PENS trial periods before January 9, 2026

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CMS Electrical Nerve Stimulation Coverage Criteria and Medical Necessity Requirements 2026

NCD 63 is the national coverage determination that governs Medicare coverage for assessing whether a patient is a good candidate for ongoing electrical nerve stimulation therapy. The policy covers two specific assessment techniques: Transcutaneous Electrical Nerve Stimulation (TENS) and Percutaneous Electrical Nerve Stimulation (PENS).

The core coverage policy is straightforward. Medicare pays for these techniques when a physician or physical therapist uses them to determine whether a patient will benefit from a nerve stimulator long-term. This is a diagnostic and assessment function — not treatment itself.

TENS Coverage Under NCD 63 Medicare

TENS involves attaching a nerve stimulator to the skin surface over the peripheral nerve being evaluated. The patient uses it on a trial basis. The physician or physical therapist monitors whether it effectively modulates pain.

The standard trial period is one month. CMS expects the evaluating clinician to make a suitability determination within that window. If you bill for TENS assessment services beyond the first month, you must document medical necessity for the extended trial. Missing that documentation is the fastest path to a claim denial.

The coverage policy draws three distinct outcomes from a TENS trial, and each one determines what happens next:

#	Covered Indication Copy
1	Significant pain relief: TENS may become the primary treatment modality
2	No relief or increased discomfort: Electrical nerve stimulation therapy is ruled out entirely
3	Incomplete relief: Move to PENS evaluation to determine if an implanted peripheral nerve stimulator would provide better results

That clinical decision tree is baked into the coverage criteria. Your documentation needs to reflect which outcome the trial produced, because the next claim you submit depends on it.

PENS Coverage Under NCD 63 Medicare

PENS is a diagnostic procedure. A needle electrode goes through the skin to stimulate peripheral nerves. This is a step up in invasiveness from TENS, and CMS treats it accordingly.

PENS is covered only when performed in a physician's office, clinic, or hospital outpatient department. It is not covered for home use. It must be performed by a physician or incident to a physician's service — a physical therapist cannot perform PENS independently.

The same one-month trial rule applies to PENS. Document medical necessity for anything beyond 30 days. If PENS controls pain effectively, that finding supports implantation of electrodes. That's the clinical and billing logic CMS has built into this coverage policy.

Equipment and Rental Reimbursement Rules

This is where NCD 63 gets specific in a way that catches billing teams off guard. Here's how the equipment reimbursement rules work:

Usually, the treating physician or physical therapist provides the TENS equipment for assessment. But when the clinician advises the patient to rent the device from a durable medical equipment supplier during the trial, Medicare will pay for that rental separately.

The catch: the combined reimbursement for the physician's or physical therapist's services plus the equipment rental from a DME supplier cannot exceed what Medicare would pay if the physician provided the total service — including the stimulator — themselves. Bill both the service and the rental separately and you may trigger a payment adjustment or overpayment recovery. Check your fee schedule for the all-inclusive rate before splitting the billing.

For a deeper look at covered supplies for TENS use, the policy cross-references NCD 160.13. If your patients are receiving TENS-related supplies, that section governs coverage for those items.

Benefit Categories Under This Policy

NCD 63 applies across several Medicare benefit categories:

That range matters. A physical therapist billing outpatient PT services for TENS assessment is operating under this coverage policy just as much as a pain management physician billing professional fees.

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CMS Electrical Nerve Stimulation Exclusions and Non-Covered Indications

The policy is explicit about one overarching limitation: electrical nerve stimulators do not prevent pain. They only alleviate pain as it occurs. That clinical distinction shapes the entire coverage framework.

CMS does not cover electrical nerve stimulation assessment as a preventive measure. The indication must be active pain that requires modulation, not prophylactic use.

PENS assessment outside of a physician's office, clinic, or hospital outpatient setting is not covered. There is no pathway for home-based PENS under this NCD. If you see claims submitted for PENS performed in a non-qualifying setting, deny them before they go out.

When a TENS trial produces no relief or causes greater discomfort than the patient's original pain, the policy explicitly rules out electrical nerve stimulation therapy. At that point, additional stimulation assessment claims will not be covered. Document the failed trial outcome and close the episode.

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Coverage Indications at a Glance

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CMS Electrical Nerve Stimulation Billing Guidelines and Action Items 2026

The modified policy took effect January 9, 2026. If you haven't already audited your workflows against these criteria, do it now.

Copy Action Items

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CPT, HCPCS, and ICD-10 Codes for Electrical Nerve Stimulation Under NCD 63

The CMS policy document for NCD 63 does not list specific CPT or HCPCS codes. This is not unusual for older NDCs that predate the current code-specific structure, but it creates a real electrical nerve stimulation billing problem for your team.

Without code-level guidance in the NCD itself, your charge capture relies on your MAC's local coverage determination for the applicable codes. Different MACs have published LCDs that map TENS and PENS assessment services to specific codes — and those LCDs vary by jurisdiction.

What to do:

• Contact your MAC directly or search their LCD database for electrical nerve stimulation assessment codes
• Cross-reference with NCD 160.13 for TENS supply codes
• If your billing team has historically used a specific code set for TENS or PENS assessment, confirm those codes are still valid under your MAC's current LCD before the effective date of January 9, 2026

Do not assume a code set is correct because it wasn't rejected before. The modification to this policy is a natural trigger point for a full code audit. Do that audit now.

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