Guides
How TENS units work, what Medicare and other plans cover, how to stay safe, and what a referral needs. Every fact links to its source.
For patients: start here
- TENS units: what they are, how they work, and what to ask before you startA TENS unit is a small, battery-powered device that sends mild electrical pulses through electrode pads on your skin to treat pain. The FDA classes it as a Class II device. A 2022 review found TENS may help some people, but the size of the effect is uncertain. Ask your clinician if it fits you.
- Does insurance or Medicare cover a TENS unit? What the Medicare policy saysMedicare covers TENS units under its durable medical equipment benefit, but only for certain pain and only when its rules are met. As of the LCD revision effective January 1, 2024, Medicare covers chronic intractable pain and acute post-operative pain. It denies TENS for chronic low back pain. Other plans may differ, so check with your plan.
- How to get a TENS unit through your clinician: prescription, order, and trial stepsTo get a TENS unit through insurance, start with a visit to your clinician. Medicare requires a face-to-face visit and a written order before the supplier delivers the unit. For chronic pain, you first use the unit on a 30-day to two-month rental trial. Your clinician reviews the results. Rules differ for other plans, so check with yours.
- TENS unit safety: who should not use one, where pads must not go, and when to stopTENS units are not safe for everyone. The NHS says not to use TENS if you have epilepsy, have a pacemaker, or are pregnant unless your doctor or midwife tells you to. University of Iowa Health Care says not to use it with any implanted device. Never use TENS while you sleep, bathe, or drive.
- TENS vs EMS, NMES and interferential therapy: how they differA TENS unit is made to treat pain through electrodes on the skin. EMS and NMES units are made to contract muscles. Interferential therapy crosses two medium-frequency currents inside the tissue. Some devices offer more than one mode. Your clinician's written order tells you which one you should use.
- Pain management without opioids: options to discuss with your clinicianMany non-opioid options exist for pain, such as exercise, physical therapy, mind and body practices, and devices such as a TENS unit. The CDC 2022 guideline says nonopioid therapies are preferred for subacute and chronic pain. Your doctor or physical therapist decides which options fit you. Never change a medicine on your own.
Using a TENS unit and coverage, in depth
- TENS Pad Placement Guide: Where to Put Your Electrode PadsPut TENS electrode pads on clean, dry skin near the painful area, with a gap between them, and turn the unit off first. Never place pads on broken or numb skin, the head, face, throat, or over the spine. Your clinician can show you the exact spots for your pain.
- TENS Unit Settings Explained: Intensity, Frequency and Pulse WidthA TENS unit has three main settings: intensity (how strong), frequency (how many pulses each second) and pulse width (how long each pulse lasts). Sources say intensity should feel strong but comfortable, not painful. Your clinician and your device's manual set the rest. Follow your clinician's and your device's instructions.
- Does Medicare Cover a TENS Unit? What the Rules Say in 2026Sometimes. Medicare's local policy (LCD L33802) covers a TENS unit for chronic, intractable pain or acute post-operative pain when set rules are met. It says TENS for chronic low back pain will be denied as not reasonable and necessary. Headache is also listed as not reasonable and necessary. Coverage is never certain.
- How to Get a TENS Unit Covered by Insurance: Steps and Questions to AskCoverage depends on your plan, your pain type and your records. Six steps help: see your treating clinician, ask your plan what it covers, get a written order, check the supplier, complete a trial, then decide on a purchase. Coverage is never certain, so confirm every step with your plan.
- The TENS Trial Period: What the First 30 Days Look LikeA TENS trial is a test period before you decide to keep a unit. For chronic pain, Medicare's policy requires a trial of at least one month (30 days) and no more than two months, paid as a rental. Your clinician watches how it works. Other plans may differ, so check with your plan.
- TENS for Lower Back Pain: What the Evidence and Medicare Coverage SayMedicare does not cover TENS for chronic low back pain. CMS decided on June 8, 2012 that the evidence was inadequate to support coverage. The current policy, LCD L33802, says it will be denied as not reasonable and necessary. A 2022 review calls the wider TENS evidence uncertain. Ask your clinician about options.
- Using a TENS unit for sciatica, knee pain and foot pain: what to know firstA TENS unit sends mild electrical pulses through pads on the skin to treat pain. Reviews of TENS for knee osteoarthritis are mixed. The NHS and MedlinePlus pages on sciatica and heel pain do not mention TENS. Ask your clinician about your cause of pain first, then about pad placement and Medicare rules.
- Using a TENS unit for neck, shoulder and headache pain: where the limits areThe NHS says not to use TENS on your neck, mouth or eyes. University of Iowa Health Care says not to place pads on any part of your head, face or throat. Medicare's LCD L33802 lists headache as not reasonable and necessary for TENS. Ask your clinician before any neck or shoulder trial.
- TENS vs EMS, NMES and interferential: a practical guide to what is on your deviceA TENS unit sends pulses through the skin to treat pain. Muscle stimulators, often called EMS or NMES, are made to contract muscles. Interferential units use higher-frequency currents that cross inside the body. Your device may offer more than one mode. Check its label and ask your clinician which mode your order covers.
- TENS unit electrode pads, lead wires and supplies: what you need and what Medicare saysA TENS kit has the unit, lead wires, electrode pads and a power source. Pads wear out as the adhesive fades. For covered use, Medicare's LCD L33802 sets a usual maximum of one unit of A4595 per month for 2 leads and two units for 4 leads. Lead wires, A4557, rarely need replacing more often than every 12 months.
- TENS unit safety checklist: a printable list for pacemakers, pregnancy, skin and pad placementPrint this list and review it with your clinician before your first TENS session. The NHS says not to use TENS with epilepsy or a pacemaker, or in pregnancy unless your doctor or midwife says so. Do not place pads on broken skin, the head, face or throat. Do not use TENS while you sleep, bathe or drive.
For referring clinics
- How to refer a patient for a TENS unit: documentation and processTo refer a patient for a TENS unit, the ordering clinician documents the pain diagnosis, the face-to-face visit and a written order before delivery. Medicare policy L33802 adds trial monitoring and lead documentation. Analgesic Healthcare publishes a preauthorization form for doctors and physical therapists. It lists no other steps.
- Documenting a TENS referral: what the Medicare LCD and policy article requireMedicare's TENS policy (LCD L33802 and policy article A52520) asks the treating practitioner to document the pain, prior treatment, a monitored trial and the reason for any 4-lead order. A face-to-face encounter and a written order prior to delivery may also apply. This guide lists each item, quoted from the CMS documents, with no coverage promised.
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