TL;DR: The Centers for Medicare & Medicaid Services modified NCD 175 governing Neuromuscular Electrical Stimulation (NMES) coverage, effective March 7, 2026. Here's what billing teams need to know before submitting claims.
CMS NMES coverage policy under NCD 175 in the Medicare system splits coverage into two distinct tracks — muscle atrophy treatment and functional electrical stimulation (FES) for spinal cord injury (SCI) patients seeking to walk. The modification tightens the criteria billing teams must document to support medical necessity. This policy does not list specific CPT or HCPCS codes in the updated document, but your reimbursement depends on meeting strict clinical and setting requirements that have grown more defined.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| Policy | Neuromuscular Electrical Stimulation (NMES) — NCD 175 |
| Policy Code | NCD 175 |
| Change Type | Modified |
| Effective Date | 2026-03-07 |
| Impact Level | High |
| Specialties Affected | Physical therapy, rehabilitation medicine, orthopedics, neurology, spinal cord injury programs, DME suppliers |
| Key Action | Audit documentation for all active NMES and FES claims against the nine coverage criteria and five exclusion criteria before March 7, 2026 |
CMS NMES Coverage Criteria and Medical Necessity Requirements 2026
NCD 175 in the Medicare system covers NMES under two separate tracks. They have different criteria, different documentation requirements, and different failure modes for claim denial. Confusing the two is the most common billing mistake your team will make.
Track 1: Disuse Atrophy Treatment
CMS covers NMES for muscle atrophy only when nerve supply to the muscle is intact. That means the brain, spinal cord, and peripheral nerves must all be functional. This is not coverage for neurological muscle loss — it's coverage for disuse atrophy where the nerve pathway is undamaged.
The policy gives three concrete examples: casting or splinting of a limb, contracture from burn lesion scarring, and hip replacement surgery (until orthotic training begins). Those examples aren't exhaustive, but they define the clinical pattern CMS expects. If your documentation doesn't fit that pattern, the claim is exposed.
Medical necessity for atrophy treatment means the atrophy is non-neurological in origin and the nerve supply is demonstrably intact. Document both. If your physician notes don't explicitly state nerve integrity, add that to your documentation checklist now.
Track 2: FES for Walking in Spinal Cord Injury Patients
This is where the policy gets complex — and where most claim denials happen. Functional electrical stimulation for SCI walking is covered only after the patient completes at least 32 physical therapy sessions with the device over a minimum of three months. That's a hard threshold. One session short and the claim lacks the trial period documentation CMS requires.
Physical therapy must be one-on-one, performed directly by the physical therapist — not a tech, not an aide. The goal of that PT must be training the patient to walk using NMES/FES, not treating or reversing muscle atrophy. CMS is explicit about this distinction. If your PT notes list atrophy reversal as the goal, you've documented yourself into a denial.
After the trial period, nine criteria all must be met for ongoing NMES/FES coverage. All nine. There's no partial credit here.
| # | Covered Indication |
|---|---|
| 1 | Intact lower motor units at L1 and below — both muscle and peripheral nerve |
| 2 | Muscle and joint stability for weight bearing, with demonstrated balance and upright posture independently |
| 3 | Brisk muscle contraction to NMES stimulation, with sufficient sensory perception of the electrical stimulation |
| 4 | High motivation, cognitive ability, and commitment to use the device for walking |
| 5 | Independent transfers and independent standing tolerance for at least three minutes |
| 6 | Hand and finger function to manipulate device controls |
| 7 | At least six months post spinal cord injury recovery and restorative surgery |
| 8 | No hip or knee degenerative disease, and no history of long bone fracture from osteoporosis |
| 9 | Demonstrated willingness to use the device long-term |
Criteria four and nine are the soft criteria — and they're the ones that create documentation problems. "High motivation" and "willingness to use the device long-term" need to appear in physician notes as clinical observations, not just checked boxes. If a medical director or compliance officer reviews your SCI FES claims, those are the first two items they'll scrutinize.
Setting Requirements
CMS restricts where therapists with sufficient skills to provide FES services can work. Covered settings include inpatient hospitals, outpatient hospitals, comprehensive outpatient rehabilitation facilities, and outpatient rehabilitation settings. If your patient receives NMES/FES services outside these settings, the claim will not be covered regardless of how well the patient meets the clinical criteria. Verify setting eligibility before you bill.
Prior Authorization
The updated NCD 175 does not explicitly mandate prior authorization for NMES or FES. However, given the nine-criteria requirement and the structured trial period, your Medicare Administrative Contractor (MAC) may impose prior auth requirements at the local coverage determination (LCD) level. Check your MAC's LCD before the effective date of March 7, 2026. Don't assume the absence of a federal prior authorization requirement means your MAC won't require one.
CMS NMES Exclusions and Non-Covered Indications
Five absolute contraindications make NMES/FES for walking non-covered in SCI patients. These aren't clinical judgment calls — they're hard stops in the coverage policy.
| # | Excluded Procedure |
|---|---|
| 1 | Cardiac pacemakers — any patient with a pacemaker is excluded |
| 2 | Severe scoliosis or severe osteoporosis — note the word "severe"; mild cases aren't automatically excluded, but document the severity assessment |
| 3 | Skin disease or cancer at the area of stimulation — location-specific, not a blanket skin condition exclusion |
| 4 | Irreversible contracture — reversibility matters; your documentation should address this directly |
| 5 | Autonomic dysreflexia — this is a safety exclusion, not just a billing one |
If any of these appear in a patient's chart, stop. Document the contraindication and do not bill NMES/FES for walking. A claim submitted against any of these exclusions is a denial waiting to happen — and potentially a compliance issue depending on what the documentation shows.
NMES for muscle atrophy is also excluded when the nerve supply is not intact. Neurological muscle loss — from nerve damage at any level — falls outside the atrophy coverage track. If the clinical picture is nerve damage, the atrophy track doesn't apply and neither does coverage.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Disuse atrophy — intact nerve supply, non-neurological cause (e.g., casting, burns, hip replacement) | Covered | Not specified in NCD 175 | Nerve integrity must be documented; hip replacement coverage ends when orthotic training begins |
| Disuse atrophy — neurological nerve damage | Not Covered | Not specified | Nerve supply must be intact; neurological atrophy excluded |
| NMES/FES for walking in SCI patients — all nine criteria met, post 32-session PT trial | Covered | Not specified in NCD 175 | One-on-one PT required; approved settings only |
| NMES/FES for SCI patients — fewer than 32 PT sessions completed | Not Covered | Not specified | Trial period is a hard prerequisite |
| NMES/FES for SCI patients — cardiac pacemaker present | Not Covered | Not specified | Absolute contraindication |
| NMES/FES for SCI patients — severe scoliosis or severe osteoporosis | Not Covered | Not specified | Document severity level in chart |
| NMES/FES for SCI patients — skin disease or cancer at stimulation site | Not Covered | Not specified | Site-specific exclusion |
| NMES/FES for SCI patients — irreversible contracture | Not Covered | Not specified | Reversibility must be assessed and documented |
| NMES/FES for SCI patients — autonomic dysreflexia | Not Covered | Not specified | Safety and coverage exclusion |
| NMES for atrophy reversal in SCI PT training context | Not Covered | Not specified | PT goal must be walking, not atrophy reversal |
| NMES/FES delivered outside approved settings | Not Covered | Not specified | Inpatient hospital, outpatient hospital, CORF, outpatient rehab only |
CMS NMES Billing Guidelines and Action Items 2026
The effective date of March 7, 2026 is your deadline. Work backward from it.
| # | Action Item |
|---|---|
| 1 | Audit your active NMES and FES claims before March 7, 2026. Pull every open NMES claim and run it against the two-track framework. Atrophy claims need nerve integrity documentation. FES walking claims need the 32-session PT trial documented and all nine criteria in the chart. |
| 2 | Update your documentation templates for SCI FES patients. Build the nine coverage criteria directly into your intake and ongoing documentation forms. Criteria four (motivation and cognitive ability) and nine (long-term willingness) need physician narrative — not just checkboxes. Do this before March 7, 2026. |
| 3 | Confirm PT session counts before billing FES for walking. Create a tracking mechanism that flags SCI FES patients who haven't hit 32 sessions. Billing before that threshold is a guaranteed denial. If your current system doesn't track this automatically, assign someone to audit it manually. |
| 4 | Verify that PT documentation shows one-on-one delivery. Your PT notes must show direct one-on-one treatment by the physical therapist. Group sessions, tech-supervised sessions, or aide-supervised sessions don't satisfy the requirement. Pull a sample of recent PT notes and check now. |
| 5 | Check your MAC's LCD for prior authorization requirements. NCD 175 doesn't require prior authorization at the federal level, but your local Medicare Administrative Contractor may. Go to your MAC's website and search for any LCD that overlaps with NMES or FES. Do this before March 7, 2026 — not after your first denial. |
| 6 | Screen all SCI FES patients against the five exclusion criteria. Add the five contraindications to your screening workflow. A patient with a cardiac pacemaker, severe osteoporosis, or autonomic dysreflexia should be flagged before services are ordered, not after a claim comes back denied. |
| 7 | Confirm the care setting before billing. If a patient receives NMES/FES services in a setting not listed in the policy — inpatient hospital, outpatient hospital, comprehensive outpatient rehabilitation facility, or outpatient rehab — the claim isn't covered. Setting matters as much as clinical criteria in this policy. |
If your SCI program is large or your NMES billing volume is high, talk to your compliance officer before March 7, 2026. The nine-criteria requirement creates meaningful documentation exposure, and a proactive audit now is cheaper than a post-payment review later.
| 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 NMES Under NCD 175
Covered CPT and HCPCS Codes
The updated NCD 175 does not list specific CPT or HCPCS codes. CMS has not included a code-level table in this version of the policy.
NMES billing typically involves HCPCS codes for the device and supplies — your durable medical equipment (DME) supplier and your billing team should cross-reference current HCPCS code sets for neuromuscular electrical stimulators and related electrodes and supplies. Refer to CMS Section 160.13 of the NCD Manual for coverage of medically necessary supplies used with NMES, which this policy cross-references directly.
Work with your MAC or a billing consultant to confirm which HCPCS codes apply to your specific claims. Do not assume the absence of codes in the policy means any HCPCS code will be accepted — MACs can and do restrict coverage to specific codes through local coverage determinations.
Key ICD-10-CM Diagnosis Codes
NCD 175 does not list specific ICD-10-CM codes. Diagnosis coding for NMES claims should reflect the underlying condition driving the claim — disuse atrophy from a fracture, burn contracture, post-surgical hip replacement, or spinal cord injury — using the appropriate ICD-10-CM code from your standard code set.
For SCI patients specifically, confirm that your diagnosis coding accurately captures the level and completeness of the injury. The nine coverage criteria reference L1 and below — your ICD-10-CM code should align with that anatomical level.
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