Medicare coverage. The Medicare TENS policy does not name this area; coverage depends on your plan and your clinician's documentation. As of the LCD revision effective January 1, 2024, it covers TENS for "chronic, intractable pain or acute post-operative pain" when criteria are met.
How are TENS pads placed for leg, knee or foot pain?
Pads go on clean skin near the painful area, and your clinician should show you the exact spots. The NHS says: “Place the sticky pads onto clean skin, near the painful parts of your body. Leave a gap between the pads.” The NHS page also shows a picture of white pads above and below a person’s left knee.
The University of Iowa Health Care page adds two tips. It says: “Try to surround the painful area.” It also says to place pads “on fleshy areas of the body, not over boney sites.” Its page includes illustrations for hip and knee placement. Those are examples from one health system, not a plan for you.
| Question | What the sources say |
|---|---|
| Where do pads go? | Near the painful area, with a gap between pads (NHS) |
| Around the pain? | “Try to surround the painful area.” (University of Iowa) |
| On bone? | Place pads on fleshy areas, not over bony sites (University of Iowa) |
| On numb skin? | Do not use TENS on numb areas (NHS) |
See our pad placement guide for more rules. The guide on TENS for sciatica, knee and foot pain covers each area.
Can I use a TENS unit if my feet or legs are numb?
Be careful, and ask your clinician first. The NHS says: “Do not use TENS on irritated, broken, infected or numb areas of skin.” The University of Iowa Health Care page lists, among places not to use TENS, “Skin that does not have normal sensation (feeling).”
This matters for people with nerve damage in the feet. If you cannot feel the skin well, you may not notice irritation from the pads. Read the glossary entry on peripheral neuropathy. Then ask your clinician if and where pads may go. Our safety guide lists more limits.
What about sciatica?
Pad placement for sciatica depends on the cause, so ask your clinician where your pads should go. Our glossary defines sciatica. Your clinician decides what is going on and what plan fits. The NHS says: “If you’re not sure what’s causing your pain, see a healthcare professional before using a TENS machine.”
If your clinician orders a trial, ask where the pads may go and which areas are off limits. The University of Iowa page says not to use TENS “directly on your backbone.” Our page on back pain explains the Medicare rule for chronic low back pain.
What about foot pain?
Foot pain has many causes, and your clinician needs to find yours. The glossary entry on plantar fasciitis explains a term you may hear. Pad placement for foot pain depends on the cause, so ask your clinician where your pads should go.
Our blog has general reading on foot pain: causes for foot pain and how to fix, foot pain after running and what’s causing my morning foot pain. Those posts are general information. Ask your clinician about your own foot pain.
What does Medicare say about this area?
The Medicare TENS policy, local coverage determination (LCD) L33802, does not name leg, knee or foot pain. As of the revision effective January 1, 2024, it says “A TENS is covered for the treatment of beneficiaries with chronic, intractable pain or acute post-operative pain when one of the following coverage criteria, I or II, are met.”
It also says “A TENS unit will be denied as not reasonable and necessary for acute pain (less than three months duration) other than for post-operative pain.” For chronic pain, “The pain must have been present for at least three months.” Coverage depends on your plan and your clinician’s documentation. Other plans differ, so check with your plan. Our insurance coverage guide explains the usual steps.
What can I do alongside a TENS unit?
Your clinician may suggest walking, stretching or therapy. The University of Iowa Health Care page says TENS helps most during activities such as walking, doing chores, or exercise. Our post on the benefits of walking offers general reading. Ask your clinician what level of activity is right for your leg, knee or foot.
Who should not use a TENS unit?
The NHS says: “Do not use TENS if: you have epilepsy; you have a pacemaker; you’re pregnant, unless your doctor or midwife tells you to.” The University of Iowa Health Care page also lists a defibrillator and any implanted metallic or electronic device. Follow your clinician’s instructions and your device’s instructions. Read our TENS unit safety guide.
Next step
Talk with your doctor or physical therapist about your leg, knee or foot pain before you try a TENS unit. To ask AHC a question, call (800) 749-1188 or use Contact. You can also read our guide to TENS units.
Questions people ask
Where do TENS pads go for knee pain?
Your clinician or physical therapist should show you. The NHS page includes a picture of pads placed above and below a knee, and says to place pads near the painful parts of your body with a gap between them. University of Iowa advises placing pads on fleshy areas, not over bony sites.
Can I use a TENS unit if my feet are numb?
Be careful. The NHS says, "Do not use TENS on irritated, broken, infected or numb areas of skin." The University of Iowa Health Care page lists "Skin that does not have normal sensation (feeling)." Ask your clinician before you place pads on a numb foot or leg.
Does Medicare cover a TENS unit for knee or foot pain?
The Medicare TENS policy (LCD L33802) does not name leg, knee or foot pain. It covers TENS for chronic, intractable pain or acute post-operative pain when criteria are met. Coverage depends on your plan and your clinician's documentation. Check with your plan.
Can I use a TENS unit for sciatica?
Pad placement for sciatica depends on the cause. Sciatica has several causes, so see your clinician first. If your clinician orders a trial, ask where the pads may go. Read our guide on TENS for sciatica, knee and foot pain.
Terms on this page
Sources
- NHS: TENS (transcutaneous electrical nerve stimulation)
- University of Iowa Health Care: Transcutaneous electrical nerve stimulator (TENS)
- CMS: LCD Transcutaneous Electrical Nerve Stimulators (TENS) (L33802)
Checked against the sources above on October 26, 2026. Coverage rules change, so check the linked page or your plan before you act.
This page gives general information, not medical advice. Talk with your doctor or physical therapist about your own care, and follow your clinician's and your device's instructions. In an emergency, call 911.
