--- title: "TENS Electrode Pads, Lead Wires and Supplies Guide" description: "TENS unit electrode pads, lead wires and supplies: what is in a kit, how pads are cared for, and what Medicare's LCD L33802 says about A4595 and A4557." url: https://analgesic.multisites.ai/guides/tens-electrode-pads-supplies-guide publisher: Analgesic Healthcare phone: +1-800-749-1188 contact: https://analgesic.multisites.ai/contact --- Guide # TENS unit electrode pads, lead wires and supplies: what you need and what Medicare says A 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. Updated October 26, 20267 min read4 sources ## What is in a kit University of Iowa Health Care lists a dual-channel unit, two wires with 4 connectors, four electrode patches, a power source and a belt clip. ## Medicare supply limits LCD L33802 sets a usual maximum of one unit of A4595 per month for 2 leads and two units per month for 4 leads. ## Lead wires The LCD says replacing lead wires (A4557) more often than every 12 months would rarely be reasonable and necessary. ## Care keeps pads usable University of Iowa Health Care says pads stay sticky longer when you clean your skin first and store them in their bags. ## What comes in a TENS kit? A kit has the unit, lead wires, electrode pads and a power source. University of Iowa Health Care lists what its package should have: a “TENS unit (dual channel)”, “Two wires with a total of 4 connectors”, “Four electrode patches”, “Power source/batteries” and a “Belt clip”. A [TENS unit](https://analgesic.multisites.ai/glossary/tens-unit) sends mild electrical pulses through pads on the skin to treat pain. The parts below carry that current from the unit to you. Part What it does Notes Unit Makes the pulses and holds the controls Dual channel lets you place up to 4 pads [Lead wires](https://analgesic.multisites.ai/glossary/lead-wire) Carry the current from the unit to the pads University of Iowa Health Care: do not bend or coil them tightly [Electrode pads](https://analgesic.multisites.ai/glossary/electrode-pad) Stick to the skin and pass the current Wires connect with a pin or a snap; pad shapes and sizes vary Power source Runs the unit Alkaline or rechargeable batteries Belt clip or pouch Holds the unit while you move Medicare does not separately allow these University of Iowa Health Care advises to pick a model with two channels, since that allows up to 4 pads. It also says to “Make sure it will be easy to buy replacement patches when you need them.” Follow your clinician’s and your device’s instructions. See our [TENS unit safety guide](https://analgesic.multisites.ai/guides/tens-unit-safety) before you use any supplies. ## How do I care for and store electrode pads? Clean skin and good storage keep pads working longer. University of Iowa Health Care says: “The patches will stay sticky and last longer if you clean your skin before you start and put them back in the storage bags when you are done.” Use these steps from the University of Iowa page: 1. Turn the unit off before you place, move or remove pads. 2. Make sure the skin is clean and dry. Clean off oil and lotion. 3. Place the pads. They should not touch each other or any metal object. 4. When done, turn the unit off and take the lead wires out of the pads. 5. Peel the pads off gently and place them back on the plastic liner. 6. Put the liner and pads in the plastic storage bag and keep them in a cool, dry place. The page also says “Patches can dry out if left out of the storage bags too long.” Dirty pads “can be washed softly with your fingertips under slow-running, cold water, and air-dried.” For the unit itself, the page says “Do not use chemical cleaners” and “Do not use rubbing alcohol.” ### How do I make a pad sticky again? Try the method University of Iowa Health Care gives: “Wet your fingertip with water and gently rub the patch surface. Let it dry for 60 seconds and try putting it on again. If this does not work, use new patches.” For pads that slip, the page also mentions skin prep products and, if sweat is the problem, medical tape. It says to “Ask your health care team for instructions” on tape. ### How often should I replace pads? It depends on the pad and on how you use it. The page says patches “can be used over and over, until the adhesive wears out” and that “Patches may last up to 2 weeks.” That is the page’s general note, not a rule for your pads. Check your manufacturer’s guidance, and replace pads that no longer stick. ## What skin problems can pads cause? Pads can irritate skin. The NHS says: “If your skin becomes itchy, irritated or red (redness may be harder to see on brown or black skin), turn off the machine and remove the pads.” It adds that a healthcare professional “can also tell you about alternatives if your skin is sensitive to the sticky pads.” University of Iowa Health Care says people allergic to nickel or adhesives may have [skin irritation](https://analgesic.multisites.ai/glossary/skin-irritation) with TENS. It says to call your health care team if you have “redness, a rash, or itching in the first 24 hours of use.” It also says to move pads to a different site and not to put them on broken or irritated skin. Do not share pads with other people. The NHS says not to use TENS on “irritated, broken, infected or numb areas of skin.” If you cannot use standard pads because of a skin problem, the Medicare LCD describes a [conductive garment](https://analgesic.multisites.ai/glossary/conductive-garment) (E0731). It says a garment “is rarely reasonable and necessary” and is covered only when listed conditions are met. Ask your clinician. ## What does Medicare say about TENS supplies? Medicare allows supplies only with a covered TENS, and only up to usual maximums. This section quotes the Medicare TENS policy, LCD L33802, in the revision effective January 1, 2024. Quotes are exact. No coverage is promised, and every claim depends on the LCD and its policy article, A52520. ### What are the A4595 limits? The LCD says: “Separate allowance will be made for replacement supplies when they are reasonable and necessary and are used with a covered TENS. Usual maximum utilization is:” TENS leads Usual maximum 2 leads “a maximum of one unit of A4595 per month” 4 leads “a maximum of two units of A4595 per month” The LCD adds: “If the use of the TENS unit is less than daily, the frequency of billing for the TENS supply code should be reduced proportionally.” The policy article says what A4595 includes: “A TENS supply allowance (A4595), is an all-inclusive code and includes items such as electrodes (any type), conductive paste or gel (if needed, depending on the type of electrode), tape or other adhesive (if needed, depending on the type of electrode), adhesive remover, skin preparation materials, batteries (9 volt or AA, single use or rechargeable), and a battery charger (if rechargeable batteries are used).” ### What is the limit for lead wires, A4557? The LCD says: “Replacement of lead wires (A4557) more often than every 12 months would rarely be reasonable and necessary.” The policy article explains the unit: “For code A4557, one unit of service is for lead wires going to two electrodes. If all the lead wires of a 4 lead TENS unit needed to be replaced, billing would be for two units of service.” ### What is not separately allowed? The policy article lists items that get no separate allowance: “There should be no billing and there will be no separate allowance for replacement electrodes (A4556), conductive paste or gel (A4558), replacement batteries (A4630), or a battery charger used with a TENS unit.” It also says “Other supplies, including but not limited to the following, will not be separately allowed: adapters (snap, banana, alligator, tab, button, clip), belt clips, adhesive remover, additional connecting cable for lead wires, carrying pouches, or covers.” During a rental, supplies are included: “During the rental of a TENS unit, supplies for the unit are included in the rental allowance; there is no additional allowance for items such as electrodes, lead wires, and batteries.” If a unit is purchased, “the allowance is all-inclusive of items such as lead wires and one month’s supply of items such as electrodes, conductive paste or gel (if needed), and batteries.” ### What are the refill rules? The LCD sets refill rules for suppliers. It says suppliers “must contact the beneficiary, and document an affirmative response, prior to dispensing the refill and not automatically ship on a pre-determined basis”. It also says “Suppliers must not dispense a quantity of supplies exceeding a beneficiary’s expected utilization” and “a supplier must not dispense more than a three (3) - month quantity at a time.” Reimbursement for supplies is contingent upon a covered unit. The LCD says: “Claims for TENS supplies provided when there is no covered TENS unit will be denied as not reasonable and necessary.” The LCD also lists conditions that are not reasonable and necessary for TENS, including headache, and says TENS for chronic low back pain “will be denied as not reasonable and necessary.” Read our [Medicare coverage guide](https://analgesic.multisites.ai/guides/does-medicare-cover-tens-unit) and [post on Medicare supply limits](https://analgesic.multisites.ai/medicare-tens-supply-limits) for more. For other plans, check with your plan. ## What if a pad or wire stops working? Turn the unit off first, then check the parts. University of Iowa Health Care says to check the patches, since you may be able to reactivate a sticky surface, and to check that the wires are plugged into the patch and the unit properly. If a wire comes out of the unit or a patch, the page says to “Turn the unit off, put the wire back in, and restart the unit.” It also says that if patches fall off, you should turn the unit off, take the wire out of the patch, and either clean and dry the patch or replace it with a new one. Make sure your skin is clean and dry before you restart. If wires look damaged, do not use them. The page warns that you can get shocked if you “touch bare wires on a damaged cord.” Replace damaged parts through your supplier or the vendor in your manual. ## What should I check before I buy pads? Check fit, connectors and your order. Use this list: - Does the pad connector (pin or snap) match your lead wires? - Does your manual say which pads work with your unit? - Is the pad size right for the area your clinician chose? - Are you buying from the vendor or a source your manual names? - If you want your plan to pay, have you asked what it covers? University of Iowa Health Care says its own cost list is “the TENS unit, replacement patches, and batteries as you need them.” Plan for pads and batteries as ongoing needs. ## Next step Keep your manual, your order and your pad receipts together. Talk with your clinician about the right pads for you. Then call AHC at (800) 749-1188 or use [contact](https://analgesic.multisites.ai/contact). Also see [how to get a TENS unit](https://analgesic.multisites.ai/guides/how-to-get-a-tens-unit). ## Questions people ask ### Does Medicare cover TENS electrode pads? Only as part of a covered TENS. LCD L33802 says reimbursement for supplies is contingent upon use with a covered TENS unit. Supplies are billed under code A4595, which includes electrodes, adhesive, batteries and similar items. No coverage is promised. Your clinician and your supplier must meet the policy's rules. ### How many TENS pads does Medicare allow per month? For covered use, the LCD lists a usual maximum of one unit of A4595 per month for 2 leads and two units per month for 4 leads. If you use the unit less than daily, the billing frequency should be reduced in proportion. The LCD revision is effective January 1, 2024. ### How often should lead wires be replaced? The Medicare LCD says replacing lead wires (A4557) more often than every 12 months would rarely be reasonable and necessary. For your own unit, follow the manufacturer's instructions and check for damage. University of Iowa Health Care says not to bend or coil the wires tightly. ### How do I make TENS pads sticky again? University of Iowa Health Care says to wet your fingertip with water, gently rub the patch surface, and let it dry for 60 seconds before you try it again. If that does not work, use new patches. Cleaning your skin first and storing pads in their bags also helps. ### How long do TENS pads last? It varies. University of Iowa Health Care says patches can be used over and over until the adhesive wears out, and that patches may last up to 2 weeks. Your manufacturer's instructions apply to your pads. Replace pads that no longer stick or that irritate your skin. ### Can I use any brand of pads on my unit? Check first. University of Iowa Health Care says to look in your TENS unit manual to learn how to get more supplies, and to check with the vendor to be sure the patches work with your unit. Wires connect to pads with a pin or a snap, so the connector type matters. ## Terms on this page - [Chronic low back pain](https://analgesic.multisites.ai/glossary/chronic-low-back-pain) - [Conductive garment](https://analgesic.multisites.ai/glossary/conductive-garment) - [Skin irritation](https://analgesic.multisites.ai/glossary/skin-irritation) - [TENS unit](https://analgesic.multisites.ai/glossary/tens-unit) ## Sources 1. [CMS Medicare Coverage Database: LCD L33802, Transcutaneous Electrical Nerve Stimulators (TENS)](https://www.cms.gov/medicare-coverage-database/view/lcd.aspx?lcdid=33802) 2. [CMS Medicare Coverage Database: Article A52520, TENS Policy Article](https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=52520) 3. [University of Iowa Health Care: Transcutaneous electrical nerve stimulator (TENS)](https://uihc.org/health-topics/transcutaneous-electrical-nerve-stimulator-tens) 4. [NHS: TENS (transcutaneous electrical nerve stimulation)](https://www.nhs.uk/conditions/transcutaneous-electrical-nerve-stimulation-tens/) 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. ## Keep reading - [How many TENS supplies does Medicare allow each month?As of the LCD revision effective January 1, 2024, Medicare's usual maximum is one unit of supply code A4595 per month for a 2-lead TENS unit and two units per month for a 4-lead unit. Supplies are paid only with a covered TENS unit, and a supplier may not dispense more than a three-month quantity at a time.](https://analgesic.multisites.ai/medicare-tens-supply-limits) - [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.](https://analgesic.multisites.ai/guides/does-medicare-cover-tens-unit) - [How to clean and store TENS electrode pads, per Iowa Health CareUniversity of Iowa Health Care says soft washing with cold running water, air drying, and storing pads on their liner in the plastic bag in a cool, dry place can help them last. It also describes a fingertip water method to restore stickiness. Always follow the instructions that came with your pads.](https://analgesic.multisites.ai/clean-and-store-tens-electrode-pads) - [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.](https://analgesic.multisites.ai/guides/tens-unit-insurance-coverage) - [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.](https://analgesic.multisites.ai/guides/how-to-get-a-tens-unit) - [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.](https://analgesic.multisites.ai/guides/tens-unit-safety) ## Questions about your unit or a bill? Call toll free. For customer care, ask for extension 508. [Call (800) 749-1188](tel:+1-800-749-1188)[Pay invoice](https://ahcpatientservices.com/)