Transcutaneous Electrical Nerve Stimulation (TENS) for Acute Post-Operative Pain — NCD 145 | CMS Coverage Update

TL;DR: The Centers for Medicare & Medicaid Services modified NCD 145, the national coverage determination for transcutaneous electrical nerve stimulation (TENS) for acute post-operative pain, effective March 7, 2026. Here's what changes for billing teams.

This update clarifies how TENS devices are classified under Medicare — as supplies, not durable medical equipment — when used for acute post-operative pain. The CMS TENS coverage policy applies to both Part A inpatient and Part B outpatient settings. The policy does not list specific CPT or HCPCS codes, so billing teams need to verify code assignment with their Medicare Administrative Contractor. This is a coverage policy your billing team should understand before submitting any TENS-related claims for surgical patients.

Quick-Reference Table

CMS TENS Coverage Criteria and Medical Necessity Requirements 2026

TENS is covered under Medicare for acute post-operative pain relief. The Centers for Medicare & Medicaid Services is explicit about this: TENS qualifies whether it's used as an adjunct to drugs or as a replacement for them. Medical necessity does not require drug therapy to fail first. If your surgical patient needs pain management and TENS is the clinical choice, coverage applies.

The medical necessity standard here is tied directly to the nature of the pain — it must be acute pain resulting from surgery. That's a narrower criterion than it sounds. Pain that began as post-operative but has stretched into a chronic pattern doesn't meet the acute standard anymore. CMS expects TENS for this indication to run 30 days or less.

This is where billing teams get tripped up. You start billing for TENS post-op, the 30-day window passes, and nobody flags the transition. At day 31, you may have a medical necessity problem — not because TENS isn't helping, but because the documentation no longer supports coverage under NCD 145. At that point, the device may need to be covered as durable medical equipment under NCD 160.27, which is a completely different coverage policy with different billing requirements.

Prior authorization is not explicitly required under NCD 145 for TENS in the acute post-operative setting. But that doesn't mean your MAC won't have its own local coverage determination with additional requirements. Check your MAC's LCD before assuming PA-free billing is clean billing.

CMS TENS Exclusions and Non-Covered Indications

NCD 145 doesn't cover TENS for chronic pain under this policy. That's the main boundary. If the documentation shows the patient's pain has transitioned from acute post-operative to chronic, the claim no longer belongs under NCD 145.

CMS is direct about this: when TENS use extends beyond what's reasonably expected for acute pain recovery, contractors are expected to investigate whether the device is now treating chronic pain. If that's the case, the coverage path shifts entirely — the TENS device becomes durable medical equipment and falls under NCD 160.27. The reimbursement pathway, benefit category, and claim submission process all change.

Billing TENS as a supply under Part A or Part B when the patient is actually in a chronic pain phase is a claim denial risk. Worse, it's a compliance exposure. Document the clinical rationale for every week of TENS use past the initial post-op period.

Coverage Indications at a Glance

CMS TENS Billing Guidelines and Action Items 2026

The real issue with this policy isn't coverage eligibility — TENS for post-op pain has been covered for years. The issue is classification and duration. Most TENS billing errors come from one of two places: billing the device as DME when it should be a supply, or continuing to bill under NCD 145 after the 30-day acute phase ends. Here's how to tighten that up before the effective date of March 7, 2026.

CPT, HCPCS, and ICD-10 Codes for TENS Under NCD 145

Covered Codes Under NCD 145

NCD 145 does not list specific CPT or HCPCS codes in the policy document. This is a meaningful gap for TENS billing. Without enumerated codes in the NCD itself, your billing team must confirm the correct codes with your MAC.

TENS billing typically involves HCPCS codes, but the appropriate code depends on the device type (durable vs. disposable), the setting, and how the device is classified on the claim. Under NCD 145, the device is a supply — not DME — so the standard DME HCPCS codes for TENS units may not apply here.

Contact your Medicare Administrative Contractor directly to confirm which codes they expect for:

• Inpatient TENS (supply under Part A)
• Outpatient TENS (supply incident to a physician's service under Part B)

Do not assume that codes used for chronic pain TENS (DME path under NCD 160.27) are appropriate for acute post-operative TENS (supply path under NCD 145). These are separate billing paths with different code sets.

Not Covered / Experimental Codes

No specific codes are designated as non-covered or experimental in NCD 145. Coverage is based on clinical indication and duration, not code-level exclusions.

Key ICD-10-CM Diagnosis Codes

NCD 145 does not specify ICD-10-CM codes. Diagnosis coding for TENS claims should reflect the post-operative pain diagnosis. Work with your clinical documentation and coding teams to ensure the diagnosis code on the claim supports acute post-operative pain — not a chronic pain code. A chronic pain ICD-10 code on a claim billed under NCD 145 is a medical necessity mismatch that will generate denials.