--- title: "What a 30-day TENS trial looks like under Medicare rules" description: "How long to use a TENS unit before Medicare considers a purchase? Learn the LCD L33802 trial rule: 30 days minimum, up to two months, with review." url: https://analgesic.multisites.ai/what-a-30-day-tens-trial-looks-like publisher: Analgesic Healthcare phone: +1-800-749-1188 contact: https://analgesic.multisites.ai/contact --- TENS and pain relief # What a 30-day TENS trial looks like under Medicare rules For chronic, intractable pain, the Medicare TENS policy says the beneficiary must use the unit on a trial basis for at least one month (30 days), but not more than two months. The trial is paid as a rental, and the treating practitioner monitors it to judge whether the unit modulates pain. Published October 26, 20264 min read4 sources ![A woman writes in a notebook on her sofa](https://analgesic.multisites.ai/_astro/v3-post-trial.CVP0KUsR_Z1wpB61.webp) ## How long is a TENS trial? Under the Medicare TENS policy, the trial for chronic pain lasts at least one month (30 days) and no more than two months. The LCD says the unit “must be used by the beneficiary on a trial basis for a minimum of one month (30 days), but not to exceed two months.” This is the wording as of the LCD revision effective January 1, 2024. A [TENS unit](https://analgesic.multisites.ai/glossary/tens-unit) sends mild electrical pulses through pads on the skin to relieve pain. A [trial period](https://analgesic.multisites.ai/glossary/tens-trial-period) is a first stretch of use in which a practitioner checks whether the device helps. Other plans may set different rules, so check with your plan. ## What does the Medicare trial involve? Three things, all from the LCD (L33802) and national policy NCD 160.7.1: 1. **The unit is rented.** The LCD says “The trial period will be paid as a rental.” 2. **A practitioner watches.** The LCD says the trial “must be monitored by the treating practitioner to determine the effectiveness of the TENS unit in modulating the pain.” NCD 160.7.1 says its effectiveness “is monitored by the physician, or physical therapist.” 3. **A decision comes after.** For coverage of a purchase, “the treating practitioner must determine that the beneficiary is likely to derive significant therapeutic benefit from continuous use of the unit over a long period of time.” NCD 160.7.1 adds that the practitioner is generally “able to determine whether the patient is likely to derive a significant therapeutic benefit” within a trial period of one month, and that “in a few cases this determination may take longer to make.” ## What does a trial look like week by week? CMS does not publish a week-by-week plan. The outline below is a way to organize your own notes. It is our suggestion, not a CMS or clinical requirement. Your clinician sets how you use the unit. Stage What to do What to write down Set-up visit Learn the unit and pad placement from your clinician Where pads go; your device’s instructions First days Use the unit as instructed Skin changes; how the stimulation feels Middle of trial Keep using as instructed; ask your clinician about problems Pain levels before and after; activities End of trial Review your notes with your practitioner Whether the unit helped, in your words Keep notes on skin, comfort and activity. Your practitioner uses your report. We cannot say how any one trial will go, and a personal note is not a medical record. Bring it to each visit so you do not have to rely on memory. ## What do other sources say about using the unit well? University of Iowa Health Care (UIHC) describes using TENS during activity. It says, “Research has shown that TENS is most helpful for chronic pain when used for at least 30 minutes while you are active.” It says TENS “is less effective when you are sitting still, lying down, or resting.” These statements describe research, not what will happen for you. Follow your clinician’s and your device’s instructions for time and settings. UIHC also lists steps if you cannot feel the current or get no relief: check the batteries, pads and wires; try a different setting; try changing pad position. It says: “Call your health care team for help if you cannot get relief.” For skin redness, rash or itching in the first 24 hours, it says to call your health care team. Safety comes before the trial. Watch for [skin irritation](https://analgesic.multisites.ai/glossary/skin-irritation). Read our [TENS unit safety guide](https://analgesic.multisites.ai/guides/tens-unit-safety) and our post on [where not to put TENS pads](https://analgesic.multisites.ai/where-not-to-put-tens-pads). ## What happens to supplies during a rental? Policy article A52520 says: “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.” So the rental covers the unit and its supplies for Medicare payment purposes. Our post on [Medicare TENS supply limits](https://analgesic.multisites.ai/medicare-tens-supply-limits) covers what happens after a purchase. ## What if the trial does not help? NCD 160.7.1 says: “If TENS significantly alleviates pain, it may be considered as primary treatment; if it produces no relief or greater discomfort than the original pain electrical nerve stimulation therapy is ruled out.” Tell your practitioner honestly what you notice. Our guide on [the TENS trial period](https://analgesic.multisites.ai/guides/tens-trial-period) explains more about how trials are used. Remember that chronic low back pain is excluded: the LCD says TENS for it “will be denied as not reasonable and necessary.” Read why in [Medicare and TENS for chronic low back pain](https://analgesic.multisites.ai/medicare-tens-chronic-low-back-pain). Headache is also listed as not reasonable and necessary. ## Does the trial rule apply to every patient? No. The 30 day to two month trial is in the section for chronic, intractable pain other than low back pain. For acute post-operative pain, coverage is “limited to 30 days (one month’s rental) from the day of surgery” and “paid only as a rental.” The LCD denies TENS for other acute pain, meaning less than three months. ## Next step Ask your doctor or physical therapist how they would run a trial for you and what they want you to track. Then call Analgesic Healthcare at (800) 749-1188 or use [contact](https://analgesic.multisites.ai/contact) with questions about getting a unit. ## Questions people ask ### How long is the Medicare TENS trial? As of the LCD revision effective January 1, 2024, the trial for chronic, intractable pain is a minimum of one month (30 days), but not to exceed two months. The trial is paid as a rental and monitored by the treating practitioner. ### Who decides if I keep the TENS unit after the trial? For coverage of a purchase, the LCD says the treating practitioner must determine that the beneficiary is likely to derive significant therapeutic benefit from continuous use of the unit over a long period of time. ### What if the TENS unit does not help during the trial? National Coverage Determination 160.7.1 says that if TENS produces no relief or greater discomfort than the original pain, electrical nerve stimulation therapy is ruled out. Tell your practitioner what you notice during the trial. ### Does the trial rule apply after surgery? No. For acute post-operative pain, the LCD limits coverage to 30 days (one month's rental) from the day of surgery, paid only as a rental. The one to two month trial applies to chronic, intractable pain. ## Terms on this page - [Chronic low back pain](https://analgesic.multisites.ai/glossary/chronic-low-back-pain) - [Post-operative pain](https://analgesic.multisites.ai/glossary/post-operative-pain) - [Skin irritation](https://analgesic.multisites.ai/glossary/skin-irritation) - [Chronic pain](https://analgesic.multisites.ai/glossary/chronic-pain) - [Trial period](https://analgesic.multisites.ai/glossary/tens-trial-period) - [Acute pain](https://analgesic.multisites.ai/glossary/acute-pain) - [TENS unit](https://analgesic.multisites.ai/glossary/tens-unit) ## Sources 1. [CMS Medicare Coverage Database: LCD Transcutaneous Electrical Nerve Stimulators (TENS) (L33802)](https://www.cms.gov/medicare-coverage-database/view/lcd.aspx?lcdid=33802) 2. [CMS Medicare Coverage Database: NCD Assessing Patient's Suitability for Electrical Nerve Stimulation Therapy (160.7.1)](https://www.cms.gov/medicare-coverage-database/view/ncd.aspx?NCDId=63) 3. [CMS Medicare Coverage Database: Article Transcutaneous Electrical Nerve Stimulators (TENS) - Policy Article (A52520)](https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=52520) 4. [University of Iowa Health Care: Transcutaneous electrical nerve stimulator (TENS)](https://uihc.org/health-topics/transcutaneous-electrical-nerve-stimulator-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 - [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.](https://analgesic.multisites.ai/guides/tens-trial-period) - [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) - [Where not to put TENS pads: a plain-language checklistHealth sources list areas to avoid with TENS pads: broken, irritated, infected or numb skin; the head, face and throat; the eyes and mouth; and both sides of the chest or trunk at once. The lists differ a little by source. Follow your clinician's and your device's instructions.](https://analgesic.multisites.ai/where-not-to-put-tens-pads) - [Why Medicare does not cover TENS for chronic low back painAs of the Medicare LCD revision effective January 1, 2024, TENS for chronic low back pain will be denied as not reasonable and necessary. CMS allowed coverage only inside approved clinical studies from 2012, and that window ended in June 2015. Other pain types have their own rules.](https://analgesic.multisites.ai/medicare-tens-chronic-low-back-pain) - [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) - [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/)