TL;DR: The Centers for Medicare & Medicaid Services modified NCD 131 governing electrical stimulation and electromagnetic therapy wound coverage, with an effective date of March 7, 2026. Here's what billing teams need to act on now.
CMS wound therapy coverage policy under NCD 131 in the Medicare system covers electrical stimulation (ES) and electromagnetic therapy as adjunctive treatments for chronic wounds. This policy does not list specific CPT or HCPCS codes — your Medicare Administrative Contractor (MAC) may publish a local coverage determination (LCD) with applicable billing codes for your region. The modification confirms that ES and electromagnetic therapy are treated equally under this coverage policy, and the medical necessity criteria are strict. If your billing team handles wound care claims, read the conditions carefully before submitting.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| Policy | Electrical Stimulation (ES) and Electromagnetic Therapy for the Treatment of Wounds |
| Policy Code | NCD 131 |
| Change Type | Modified |
| Effective Date | 2026-03-07 |
| Impact Level | High |
| Specialties Affected | Wound care, physical therapy, primary care, vascular surgery, podiatry, endocrinology |
| Key Action | Audit active wound therapy claims for 30-day standard care and monthly physician evaluation documentation before March 7, 2026 |
CMS Electrical Stimulation and Electromagnetic Therapy Coverage Criteria and Medical Necessity Requirements 2026
The CMS electrical stimulation and electromagnetic therapy coverage policy under NCD 131 is not a blanket coverage decision. It is a tightly conditioned adjunctive therapy benefit. Medical necessity is earned through documented failure — specifically, failure to heal with standard wound care over at least 30 days.
Medicare covers ES or electromagnetic therapy only for four wound types: chronic Stage III or Stage IV pressure ulcers, arterial ulcers, diabetic ulcers, and venous stasis ulcers. "Chronic" is defined precisely — the wound must not have healed within 30 days of occurrence. This is not a clinical judgment call. It is a defined threshold, and your documentation must support it.
Before ES or electromagnetic therapy reimbursement is available, standard wound therapy must have been tried for at least 30 days with no measurable signs of healing. That 30-day clock can start while the wound is still in an acute phase — so don't assume you need to wait for chronicity to begin the standard care trial. Document from day one.
Standard wound care has a specific definition under this policy. It includes optimization of nutritional status, debridement by any means to remove devitalized tissue, and maintenance of a clean, moist wound bed with appropriate dressings. It also requires treatment of any active infection. Wound-type-specific care requirements apply on top of these basics:
| # | Covered Indication |
|---|---|
| 1 | Pressure ulcers: frequent repositioning, typically every two hours |
| 2 | Diabetic ulcers: offloading of pressure and documented glucose control |
| 3 | Arterial ulcers: establishment of adequate circulation |
| 4 | Venous stasis ulcers: use of a compression system |
Measurable signs of improved healing — the threshold for continuing or starting adjunctive therapy — include a decrease in wound surface area or volume, reduction in exudate amount, and reduction in necrotic tissue. If these markers are absent after any 30-day treatment period, continued ES or electromagnetic therapy is not covered. Stop documenting and stop billing.
There is no prior authorization requirement listed in the national policy itself. However, your MAC may impose prior authorization requirements through an LCD. Check your regional MAC's current LCD for ES and electromagnetic therapy before assuming national non-requirement means regional non-requirement.
Regarding who can perform these services: ES and electromagnetic therapy can only be covered when performed by a physician, a physical therapist, or incident to a physician's service. The performing clinician must evaluate the wound at the time of treatment and contact the treating physician if the wound worsens. Monthly physician evaluation of the wound is required throughout treatment — not optional, not at the physician's discretion. This documentation gap alone causes claim denial at audit.
Finally, treatment must stop when the wound demonstrates 100% epithelialized wound bed. If your billing team sees charges continuing after a complete wound closure note appears in the chart, that is a compliance exposure. Flag it.
CMS Electrical Stimulation and Electromagnetic Therapy Exclusions and Non-Covered Indications
Three non-coverage rules in NCD 131 are absolute. No clinical circumstances override them.
First: ES and electromagnetic therapy will not be covered as an initial treatment modality. Period. If standard wound therapy has not been attempted first, the claim fails medical necessity regardless of wound severity.
Second: Continued treatment is not covered if measurable signs of healing have not been demonstrated within any 30-day treatment period. This is a rolling requirement, not just an initial one. Your billing team needs to track 30-day healing intervals throughout the entire course of treatment, not just at the start.
Third: Unsupervised use of ES or electromagnetic therapy is not covered. CMS has determined it is not medically reasonable and necessary. This matters for any arrangement where a device is sent home with a patient without formal practitioner oversight. Those claims will not survive review.
All other uses of ES and electromagnetic therapy for wound treatment that fall outside the covered indications are left to MAC discretion under their local coverage determinations. If your wound type or clinical scenario doesn't match one of the four covered wound categories, contact your MAC directly before billing.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Chronic Stage III pressure ulcer (not healed in 30 days) | Covered | Not listed in NCD 131 — check MAC LCD | Must follow 30-day standard care failure; monthly physician evaluation required |
| Chronic Stage IV pressure ulcer (not healed in 30 days) | Covered | Not listed in NCD 131 — check MAC LCD | Must follow 30-day standard care failure; monthly physician evaluation required |
| Chronic arterial ulcer (not healed in 30 days) | Covered | Not listed in NCD 131 — check MAC LCD | Adequate circulation must be established as part of standard care |
| Chronic diabetic ulcer (not healed in 30 days) | Covered | Not listed in NCD 131 — check MAC LCD | Pressure offloading and glucose control documentation required |
| Chronic venous stasis ulcer (not healed in 30 days) | Covered | Not listed in NCD 131 — check MAC LCD | Compression system use required as part of standard care |
| ES or electromagnetic therapy as initial treatment | Not Covered | N/A | Non-coverage is absolute — standard care trial must precede |
| Continued treatment with no 30-day measurable healing | Not Covered | N/A | Rolling requirement — not just at initiation |
| Unsupervised ES or electromagnetic therapy | Not Covered | N/A | CMS deems this not medically reasonable and necessary |
| Wounds at 100% epithelialized wound bed | Not Covered | N/A | Treatment must stop at full closure |
| Other wound types or uses not specified | MAC Discretion | Varies by MAC | Check local coverage determination for your region |
CMS Electrical Stimulation and Electromagnetic Therapy Billing Guidelines and Action Items 2026
These are the steps your billing team needs to complete before and after the March 7, 2026 effective date.
| # | Action Item |
|---|---|
| 1 | Pull your MAC's current LCD for ES and electromagnetic therapy. NCD 131 does not list specific CPT or HCPCS codes. Wound therapy billing codes — including any E-codes for devices — live in your MAC's LCD. If you don't have that document in front of you, get it before March 7, 2026. Billing against a national policy without knowing your regional code requirements is how you generate claim denials. |
| 2 | Build a 30-day standard care documentation checklist. Every covered claim needs to show that standard wound therapy was tried for at least 30 days before ES or electromagnetic therapy started. Your checklist should capture nutritional optimization, debridement records, moist dressing maintenance, infection treatment, and wound-type-specific interventions (repositioning for pressure ulcers, compression for venous stasis, etc.). If this documentation is missing from the chart at the time of billing, the claim will not hold up. |
| 3 | Set a monthly physician evaluation reminder for all active ES and electromagnetic therapy patients. This is a hard coverage requirement, not a clinical best practice. If your treating physician doesn't document a wound evaluation at least monthly, you lose coverage for that period. Build this into your scheduling and documentation workflows now. |
| 4 | Establish a 30-day healing interval audit process. Continued treatment requires measurable signs of healing within every 30-day period. Assign someone on your clinical or billing team to review active wound therapy cases every 30 days. If healing markers aren't documented — decrease in wound size, reduction in exudate, reduction in necrotic tissue — stop treatment and stop billing. This is not discretionary. |
| 5 | Update your compliance review process for wound closure documentation. When a physician documents 100% epithelialized wound bed, ES and electromagnetic therapy charges must stop. Create a workflow trigger that flags any ES or electromagnetic therapy charges submitted after a wound closure note. Catching this proactively is far cheaper than a post-payment audit. |
| 6 | Confirm performer credentials on every claim. Coverage is limited to physicians, physical therapists, and clinicians billing incident to a physician's service. If your documentation shows the therapy was performed outside these categories, expect a denial. Audit your billing templates to confirm the performing provider type is clearly captured. |
| 7 | Talk to your compliance officer if you have active patients receiving ES or electromagnetic therapy at home. The unsupervised use exclusion is broad. If there's any ambiguity about whether your arrangement qualifies as supervised under this policy, get a compliance opinion before the March 7, 2026 effective date rather than after. |
| 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 Stimulation and Electromagnetic Therapy Under NCD 131
NCD 131 does not list specific CPT, HCPCS, or ICD-10 codes. This is common for national coverage determinations that predate standardized code attachment requirements.
The applicable billing codes for ES and electromagnetic therapy wound treatment are assigned at the MAC level through local coverage determinations. Contact your MAC directly — or pull their LCD for ES and electromagnetic therapy — to get the exact codes that apply in your jurisdiction. Major MACs (Novitas, CGS, Palmetto GBA, NGS, WPS, First Coast, Noridian) each maintain LCDs that map to NCD 131 and specify which codes trigger coverage review under this national policy.
Do not bill without first confirming applicable CPT, HCPCS, and ICD-10 codes with your MAC. The national policy provides no code guidance, and your MAC LCD is the controlling document for your region.
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.