TL;DR: The Centers for Medicare & Medicaid Services modified NCD 63, its coverage policy for assessing patient suitability for electrical nerve stimulation therapy, effective January 9, 2026. Here's what billing teams need to know.
This update to NCD 63 in the Medicare system touches how CMS covers the two-stage evaluation process for nerve stimulation — TENS trials first, then percutaneous stimulation if TENS falls short. No specific CPT or HCPCS codes are listed in the policy document itself, but the coverage criteria have real billing consequences for physicians, physical therapists, and outpatient facilities. If your practice bills for pain management or outpatient neuromodulation services, this coverage policy deserves a close read before January 9, 2026.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Medicare) |
| Policy | Assessing Patient's Suitability for Electrical Nerve Stimulation Therapy |
| Policy Code | NCD 63 |
| Change Type | Modified |
| Effective Date | January 9, 2026 |
| Impact Level | Medium |
| Specialties Affected | Pain Management, Physical Therapy, Neurology, Outpatient Hospital, Primary Care |
| Key Action | Review documentation protocols for TENS trial periods and PENS medical necessity before January 9, 2026 |
CMS Electrical Nerve Stimulation Coverage Criteria and Medical Necessity Requirements 2026
NCD 63 is the National Coverage Determination governing Medicare coverage of the assessment process used to determine whether a patient is a candidate for ongoing electrical nerve stimulation treatment. That includes both transcutaneous electrical nerve stimulators (TENS) and implanted nerve stimulators. The Centers for Medicare & Medicaid Services treats this evaluation as a covered benefit under several categories: incident to a physician's professional service, outpatient hospital services incident to a physician's service, outpatient physical therapy services, and physicians' services directly.
The coverage policy works in two stages. First, TENS — attaching a stimulator to the skin surface over the target peripheral nerve. Then, if TENS produces incomplete relief, percutaneous electrical nerve stimulation (PENS) — inserting a needle electrode through the skin to stimulate the peripheral nerve more directly. Each stage has its own medical necessity rules and documentation requirements.
TENS Trial Period and Medical Necessity
CMS sets the standard trial period for TENS assessment at one month. During that month, a physician or physical therapist monitors the patient's response. The policy is clear: if TENS significantly alleviates pain, it qualifies as primary treatment. If it produces no relief — or causes more discomfort than the original pain — electrical nerve stimulation therapy is ruled out entirely.
The middle ground is where your documentation has to be sharp. If TENS produces incomplete relief, CMS allows the provider to move to PENS evaluation. That transition needs to be documented, not assumed.
Services furnished beyond the first month require documented medical necessity. This is not optional. CMS explicitly states that if TENS assessment runs past 30 days, the record must support why the determination couldn't be made within the standard period. A missing justification is a straight path to a claim denial.
TENS equipment during the trial period can be furnished by the physician or physical therapist, or the patient can rent it from a durable medical equipment supplier. If the patient rents from a DME supplier, Medicare will reimburse both the rental and the professional's evaluation services — but with a ceiling. The combined reimbursement for the rental plus the professional service cannot exceed what Medicare would pay if the physician or physical therapist furnished the entire service themselves, including the equipment. Watch that payment ceiling if you're splitting the billing between a clinical provider and a DME supplier.
PENS Evaluation and Medical Necessity
Percutaneous electrical nerve stimulation is a diagnostic procedure. CMS covers it only when performed in a physician's office, clinic, or hospital outpatient department. It is not covered in other settings, and it is not covered if performed by a physical therapist alone — PENS is covered only when performed by a physician or incident to a physician's service.
The same one-month trial standard applies to PENS. If the physician can determine within 30 days whether the patient will benefit from an implanted nerve stimulator, that's the expected timeline. Beyond one month, medical necessity documentation is required. If PENS effectively controls pain, CMS recognizes implantation of electrodes as the warranted next step.
CMS also clarifies an important clinical distinction that carries billing weight: electrical nerve stimulators do not prevent pain. They alleviate pain as it occurs. A patient can be trained to use the device independently. Once that training is complete, the patient does not need direct physician supervision to use the stimulator effectively. That framing matters when justifying ongoing professional involvement versus self-directed patient use.
CMS Electrical Nerve Stimulation Exclusions and Non-Covered Indications
CMS does not cover PENS in settings outside of a physician's office, clinic, or hospital outpatient department. If you bill PENS performed in any other setting, expect a denial.
Physical therapist-performed PENS is not covered. The policy is unambiguous: PENS coverage requires a physician or service incident to a physician. Physical therapists are recognized for TENS assessment and monitoring, not for PENS procedures.
TENS or PENS services furnished beyond the standard one-month trial period are not automatically covered. They require documented medical necessity. If that documentation isn't in the chart, the claim won't hold up. Build the documentation expectation into your clinical workflow, not as an afterthought at the time of billing.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| TENS trial to assess suitability for transcutaneous nerve stimulator | Covered | Not specified in NCD 63 | Trial period up to 1 month; beyond 1 month requires documented medical necessity |
| TENS assessment by physician | Covered | Not specified in NCD 63 | Equipment may be furnished by physician or rented from DME supplier |
| TENS assessment by physical therapist | Covered | Not specified in NCD 63 | Physical therapist may monitor TENS effectiveness; combined payment cap applies when DME is separate |
| TENS rental from DME supplier during trial | Covered | Not specified in NCD 63 | Combined payment cannot exceed what physician/PT furnishing service plus equipment alone would receive |
| PENS for further evaluation after incomplete TENS relief | Covered | Not specified in NCD 63 | Physician's office, clinic, or hospital outpatient only; covered only when performed by physician or incident to physician's service |
| PENS beyond 1-month trial | Covered with conditions | Not specified in NCD 63 | Must document medical necessity for services beyond first month |
| PENS performed in non-physician/non-outpatient settings | Not Covered | Not specified in NCD 63 | Setting restriction is absolute |
| PENS performed by physical therapist independently | Not Covered | Not specified in NCD 63 | Not covered unless incident to physician's service |
| TENS or PENS beyond 1-month trial without documented medical necessity | Not Covered | Not specified in NCD 63 | Documentation requirement is mandatory, not discretionary |
CMS Electrical Nerve Stimulation Billing Guidelines and Action Items 2026
These are the concrete steps your billing and clinical teams need to take before January 9, 2026.
| # | Action Item |
|---|---|
| 1 | Audit your documentation templates for TENS trial services. Your templates need a specific field for the treating provider's clinical determination at the one-month mark. If a patient's trial is running long, the chart entry justifying that extension must exist before you submit the claim — not after a denial. |
| 2 | Confirm that PENS is billed only for physician-performed or incident-to services. Pull a sample of your PENS claims from the past 12 months. If any were billed for physical therapist-only services without a supervising physician incident-to structure, you have exposure. Fix your charge capture routing before January 9, 2026. |
| 3 | Review your DME supplier billing arrangements for TENS rentals. If your patients rent TENS units from a separate DME supplier during the trial period, calculate whether your combined billing — professional service plus rental — stays below the payment ceiling. Exceeding it is a billing error, not just an overpayment risk. |
| 4 | Update clinical staff on the incomplete-relief pathway. The handoff from TENS to PENS evaluation must be explicitly documented. "TENS provided incomplete relief; proceeding to percutaneous evaluation" should appear in the record. Staff need to know this transition triggers a new documentation requirement, not just a clinical decision. |
| 5 | Verify setting compliance for all PENS procedures. PENS must be performed in a physician's office, clinic, or hospital outpatient department. If you have any hybrid or telehealth-adjacent arrangements that could cloud the setting determination, review those with your compliance officer before the effective date. |
| 6 | Check your electronic health record for TENS supplies cross-referencing. NCD 63 references NCD 160.13, which covers medically necessary supplies for effective TENS use. If your team bills separately for TENS supplies, confirm that billing aligns with 160.13's criteria. These two policies interact, and a documentation gap in one can create a denial in the other. |
| 7 | If you're unsure how the incident-to rules apply to your practice's staffing model, talk to your compliance officer or billing consultant before January 9, 2026. The incident-to rules for PENS are strict, and the margin for error is low. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Electrical Nerve Stimulation Under NCD 63
The policy document for NCD 63 does not list specific CPT, HCPCS, or ICD-10 codes. This is not unusual for older National Coverage Determinations — NCD 63 establishes the coverage framework, and code-level specificity typically lives in the Medicare fee schedule, Local Coverage Determinations issued by your Medicare Administrative Contractor, or Medicare's code lookup tools.
For electrical nerve stimulation billing, your MAC is the right source for applicable codes. Different MACs have issued LCDs that assign specific CPT codes to TENS and PENS procedures. Check with your MAC directly, or search the CMS Medicare Coverage Database for any associated LCDs that apply in your jurisdiction. This is especially important for PENS, where the incident-to rules and setting restrictions mean the wrong code or modifier can trigger a denial regardless of clinical appropriateness.
Do not guess at codes based on this NCD alone. If your billing team isn't certain which CPT codes map to TENS trial assessment and PENS procedures in your MAC's jurisdiction, get that clarity from your MAC or a billing consultant who works with neuromodulation services.
Get the Full Picture
Track this policy across versions, search 1,500+ policies by CPT code, and get real-time alerts when any payer changes coverage.