Electrical Stimulation for the Treatment of Pain and Muscle Rehabilitation (for North Carolina Only)

Coverage Summary

Scope: This UnitedHealthcare Community Plan (North Carolina only) medical policy CSNCT0126.09 (Effective May 1, 2025) defines medical necessity criteria for electrical stimulation therapies and lists procedure/HCPCS/CPT codes and device coding notes relevant to coverage decisions in North Carolina.

Overview: The policy finds Functional Electrical Stimulation (FES) and Neuromuscular Electrical Stimulation (NMES) medically necessary when the specific, documented clinical criteria in the policy are met (see FES and NMES criteria). Multiple other electrical stimulation modalities (including interferential therapy/IFT, MENS, PENS/PNT, PENFS, PNS, PSFS/PNFS, PES/PEMF, restorative neurostimulation, scrambler therapy, and translingual stimulation) are listed as unproven / not medically necessary due to insufficient evidence. The policy includes applicable CPT/HCPCS/DME codes and notes that certain codes are not on the State of North Carolina Medicaid Fee Schedule and therefore may not be covered by the State program.

Key thresholds, modality counts, and evidence quality

Independent standing tolerance>= 3 minutes

Post-recovery/ surgery interval>= 6 months

Medically necessary modalities (count)2 (FES, NMES)

Modalities listed as unproven/not medically necessary (count)11

Main evidence quality noteOverall evidence quality: overall low to very low

Medical-Necessity Criteria

Coding (CPT / HCPCS / DME / FDA product codes)

CPT / Procedure codes referencedCPT

0278T	Transcutaneous electrical modulation pain reprocessing (e.g., scrambler therapy), each treatment session (includes placement of electrodes)
0720T	Percutaneous electrical nerve field stimulation, cranial nerves, without implantation
0783T	Transcutaneous auricular neurostimulation, set-up, calibration, and patient education on use of equipment
63650	Percutaneous implantation of neurostimulator electrode array, epidural
63655	Laminectomy for implantation of neurostimulator electrodes, plate/paddle, epidural
63663	Revision including replacement of spinal neurostimulator electrode percutaneous array(s), including fluoroscopy, when performed
63664	Revision including replacement of spinal neurostimulator electrode plate/paddle(s) placed via laminotomy or laminectomy, including fluoroscopy, when performed
63685	Insertion or replacement of spinal neurostimulator pulse generator or receiver, requiring pocket creation and connection
64555	Percutaneous implantation of neurostimulator electrode array; peripheral nerve (excludes sacral nerve)
64999	Unlisted procedure, nervous system

HCPCS / DME / Supply codes referencedmixed

A4543	Supplies for transcutaneous electrical nerve stimulator, for nerves in the auricular region, per month
A4544	Electrode for external lower extremity nerve stimulator for restless legs syndrome
A4595	Electrical stimulator supplies, 2 lead, per month (e.g., TENS, NMES)
E0720	Transcutaneous electrical nerve stimulation (TENS) device, two-lead, localized stimulation
E0721	Transcutaneous electrical nerve stimulator, stimulates nerves in the auricular region
E0730	Transcutaneous electrical nerve stimulation (TENS) device, four or more leads, for multiple nerve stimulation
E0743	External lower extremity nerve stimulator for restless legs syndrome, each
E0744	Neuromuscular stimulator for scoliosis
E0745	Neuromuscular stimulator, electronic shock unit
E0764	Functional neuromuscular stimulation, transcutaneous stimulation of sequential muscle groups of ambulation with computer control, used for walking by spinal cord injured, entire system, after completion of training program

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HCPCS E0770 - Verified FES devices (PDAC)HCPCS

E0770_note

Only the following FES devices verified by CMS PDAC to be reported with HCPCS code E0770: NESS L300 and H200 (Bioness); Odstock ODFS Pace FES System (Odstock Medical/Boston Brace); WalkAide (Innovative Neurotronics); Deluxe Digital Electronic Muscle Stimulator (Drive Medical)

HCPCS/CPT/HCPCS codes noted as not on NC Medicaid Fee Schedulemixed

A4543	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
A4544	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
E0721	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
E0743	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
0278T	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
0720T	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
0783T	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
64999	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
E0744	Not on the State of North Carolina Medicaid Fee Schedule (notation added)
E0745	Not on the State of North Carolina Medicaid Fee Schedule (notation added)

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FDA product codes and device categories referencedmixed

GZI	Functional Electrical Stimulation (FES) product code (searchable on FDA PMN site)
IPF	Neuromuscular Electrical Stimulation (NMES) for muscle rehabilitation product code
GZJ	Microcurrent Electrical Nerve Stimulation Therapy / Scrambler/TENS related product code
PZR	Peripheral Subcutaneous Field Stimulation / PNFS product code
NHI	Percutaneous Electrical Nerve Stimulation (PENS) product code
QLK	Restorative Neurostimulation/ReActiv8 product code
QHH	IB-Stim (PENFS) product code
NUH	TENS-related product code
NGX	TENS-related product code

Provider Actions & Billing Notes

Documentation Required

Document FES candidacy criteria

Document the following elements in the medical record before furnishing or ordering FES for spinal cord injury or NMES for covered indications. Records should show objective findings, prior treatments, and rationale linking the therapy to functional goals.

Intact lower motor units at L1 and below (both muscle and peripheral nerves).
Muscle and joint stability for weight bearing with balance/control to maintain an upright support posture independently.
Demonstration of brisk muscle contraction on stimulation.
Sufficient sensory perception to permit safe muscle contraction and device use.
Hand and finger function adequate to manipulate device controls.
Ability to transfer independently.
Independent standing tolerance >= 3 minutes.
High level of motivation, commitment, and cognitive ability to use the device as part of rehabilitation.
Post-recovery from SCI and restorative surgery >= 6 months.
Absence of hip or knee degenerative joint disease that would preclude benefit from FES.

Background and Evidence Summary

Background: Electrical stimulation modalities covered in the policy include transcutaneous electrical nerve stimulation (TENS), functional electrical stimulation (FES), neuromuscular electrical stimulation (NMES), percutaneous electrical nerve stimulation (PENS/PNT), percutaneous electrical nerve field stimulation (PENFS), percutaneous peripheral nerve stimulation (PNS), peripheral subcutaneous/nerve field stimulation (PSFS/PNFS), pulsed electrical/electromagnetic stimulation (PES/PEMF), restorative neurostimulation (e.g., ReActiv8), scrambler therapy (transcutaneous electrical modulation pain reprocessing), and translingual stimulation (PoNS/TLNS).

Mechanisms and uses: Modalities differ by mechanism and target: FES applies coordinated stimulation to intact motor nerves to produce purposeful muscle contractions to enable functional activities (standing, ambulation) or therapeutic exercise; NMES uses transcutaneous currents to evoke muscle contractions for reinnervation, prevent disuse atrophy, reduce spasm, or promote voluntary control; PENS/PNT uses percutaneous needle electrodes connected to external power for pain modulation; PENFS delivers percutaneous auricular field stimulation thought to modulate central pain pathways; PNS and PNFS/PSFS place leads near peripheral nerves or subcutaneous fields to disrupt pain signal transmission; PEMF/PES deliver electromagnetic fields hypothesized to affect bone, cartilage, and inflammatory cell function; restorative neurostimulation targets specific muscles (e.g., multifidus) via implanted leads for chronic low back pain rehabilitation; scrambler therapy provides variable nonlinear waveforms conveying non-pain information transdermally for chronic pain; translingual stimulation (PoNS/TLNS) stimulates cranial nerve inputs via the tongue to enhance neuroplasticity in gait/balance rehabilitation.

Distinction: TENS is distinguished from neuromuscular stimulators — TENS delivers sensory-level, typically milliamp-range currents to modulate pain perception, whereas neuromuscular stimulators (FES/NMES) produce motor-level stimulation to evoke muscle contractions. Many modalities in the policy lack sufficient high-quality evidence, and several are designated unproven or not medically necessary.

Evidence source	Key finding
Hayes HTAs (FES: stroke, SCI, chronic stroke)
Hayes HTAs (2022a/2022b updates to 2024): low-quality evidence for rehabilitative/assistive FES in acute/subacute and chronic stroke; inconsistent functional recovery and QoL benefits; recommends more standardized RCTs with longer follow-up
ECRI / ReActiv8 PMA RCT (Gilligan 2021)
{"text":"ReActiv8 randomized sham-controlled trial (n=240): 64% with ≥50% LBP improvement; mean disability improved ~51%; 4% serious adverse events; long-term follow-ups show sustained improvements but high attrition/explant rates and limited independent confirmation"
status":""}
Bekhet et al. (2022) systematic review (SCI)
NMES/FES training in SCI (46 studies, n=414): average muscle cross-sectional area increase ~26%; evidence limited by heterogeneity and small studies; recommends multicenter RCTs
Harvey et al. (2010) RCT (ES+PRT in SCI)
Small RCT (n=20): ES+progressive resistance training increased quadriceps voluntary strength vs control but clinical importance uncertain
PEMF / PES systematic reviews (OA) (Markovic 2022; Chen 2019; Yang 2020)
PEMF: some SRs/meta-analyses show short-term pain/function benefits in knee OA but heterogenous protocols and short follow-up limit conclusions; pooled effects often small or inconsistent

Summary statements on sufficiency of evidence: The policy summarizes modality-specific conclusions: for example, PENFS evidence derives from small RCTs and observational studies suggesting possible short-term benefit for pediatric abdominal pain–related disorders but is limited by small samples, single-center designs, short follow-up and lack of blinding; PNS evidence is low-to-very-low quality with some RCTs and case series showing pain and function improvements but insufficient to draw definitive conclusions; and PES/PEMF evidence is mixed with some RCTs and systematic reviews reporting short-term benefit for osteoarthritis and selected post-operative outcomes while other trials show no benefit.

Definitions / Glossary

Definitions / Glossary:

FES: Functional electrical stimulation — coordinated application of electric current to intact motor nerve fibers to cause purposeful muscle contraction to enable therapeutic or functional outcomes such as standing or ambulation.

NMES: Neuromuscular electrical stimulation — transcutaneous electrical currents delivered to evoke muscle contractions to promote reinnervation, prevent disuse atrophy, relax spasms, and promote voluntary control.

PENS / PNT: Percutaneous electrical nerve stimulation / percutaneous neuromodulation therapy — minimally invasive pain treatment using acupuncture-like needle electrodes connected to an external power source.

PENFS: Percutaneous electrical nerve field stimulation — percutaneous auricular/peripheral field stimulation using low-frequency currents aimed at modulating central pain pathways.

ST / Scrambler: Scrambler therapy (transcutaneous electrical modulation pain reprocessing) — noninvasive transdermal therapy delivering variable, nonlinear waveforms that present non-pain information to the painful area.

PEMF / PES: Pulsed electromagnetic field / pulsed electrical stimulation — noninvasive electromagnetic or pulsed electrical therapies proposed to facilitate tissue healing, reduce pain and improve function.

PoNS / TLNS: Portable Neuromodulation Stimulator / translingual neurostimulation — a mouthpiece-based device delivering stimulation to the dorsal tongue to engage trigeminal and facial nerve inputs for gait/balance rehabilitation.

ReActiv8: ReActiv8 / restorative neurostimulation — an implantable neuromuscular stimulator targeting multifidus muscles to address chronic low back pain associated with multifidus dysfunction.

Medicare / National Guidance

Effective / Year	Guidance/Document	Type
2021 (updated 2022)
AAOS guideline on non-arthroplasty management of knee OA
other
2016 (updated 2022)
NICE guidance on TENS/PENS/IFT for LBP and sciatica
other
Bril et al., 2011
AAN/AANEM/AAPMR joint guideline for painful diabetic neuropathy (PDN)
other
2019-09-05
Functional Electrical Stimulation (FES) - Coverage and HCPCS Coding - Revised (CMS)
NCD

Revision History

2025-05-01material_change

Revised list of unproven and not medically necessary indications — removed 'percutaneous electrical nerve field stimulation (PENFS)' from the list.

2025-05-01material_change

Added HCPCS codes A4543, A4544, E0721, and E0743 to the Applicable Codes list.

2025-05-01material_change

Added notation that specific CPT/HCPCS codes (including 0278T, 0720T, 0783T, 64999, E0721, E0743, E0744, E0745, E0764, E0770, E1399, L8679-L8688, S8130, S8131) are not on the State of North Carolina Medicaid Fee Schedule and therefore may not be covered by the State of North Carolina Medicaid Program.