# Medicare and Sleep Studies: What Is Covered? > US Medicare covers sleep studies when criteria are met, but the rules for home tests, CPAP and supplies are specific. Here is the plain-English version. Canonical: https://findsleepdoctors.com/articles/medicare-sleep-study-coverage Last updated: 2026-10-30 Does Medicare cover a sleep study? Learn the US criteria for lab and home tests, CPAP coverage, adherence rules and Medicare Advantage differences. Updated 2026-10-26 · 7 min read · Sleep Doctor Near Me editorial. **Quick answer:** In the US, Medicare Part B covers sleep studies when a treating physician orders them and the documentation meets Medicare's medical necessity criteria. Home sleep apnea tests are covered under specific conditions, and CPAP is covered after a qualifying diagnosis with ongoing adherence requirements. Medicare Advantage plans may add their own rules. This article is about US Medicare; Australia's Medicare scheme works differently. ## What Medicare Part B covers Medicare Part B covers medically necessary services, including certain sleep tests and physician visits. The test must be ordered by a physician who is treating you for a condition that warrants the study. The documentation needs to show symptoms, risk factors and why the test is appropriate. Coverage is not automatic for every sleep complaint. Medicare has specific criteria for obstructive sleep apnea testing and for CPAP. The clinic should know what documentation is required and should be able to explain it before you book. ## Lab studies vs home tests Medicare covers both in-lab polysomnography and home sleep apnea tests in certain circumstances. A home test is generally used for adults with a high pre-test probability of moderate to severe obstructive sleep apnea and no significant comorbidities that would make a home test unreliable. If you have heart failure, severe lung disease, suspected central apnea, or another complex condition, Medicare may require an in-lab study. The ordering physician makes the clinical case; the contractor reviews it. ## CPAP coverage and adherence Medicare covers CPAP therapy for obstructive sleep apnea when the diagnosis is documented and the equipment is supplied by an enrolled durable medical equipment supplier. There is usually a trial period. To continue coverage, you must show that you are using the machine enough: - At least 4 hours per night - On at least 70% of nights - During the first 90 days of the trial The exact rules and review period can change, so confirm with your supplier and Medicare. If you are struggling to use CPAP, talk to your clinician before the trial ends. Our guide to [getting started with CPAP](https://findsleepdoctors.com/articles/cpap-therapy-getting-started) covers the practical side. ## What you pay After you meet the Part B deductible, Medicare generally pays 80% of the approved amount for covered services, and you pay the remaining 20% unless you have supplemental coverage. The approved amount may be less than the provider's billed charge. Ask the clinic and supplier what your out-of-pocket cost will be. Medicare Advantage plans must cover the same services as Original Medicare but can use different networks, prior authorisation and cost-sharing. Check the plan's rules before booking. ## What is not covered Medicare generally does not cover services that are not medically necessary, experimental or outside its coverage rules. It does not cover a sleep study ordered solely for convenience or a device without a qualifying diagnosis. Routine home sleep tests bought online without a physician order may not be reimbursed. Dental appliances for sleep apnea may be covered under some plans but not others. Check with your plan and the supplier before you start. ## How to improve the odds of approval 1. See a physician who documents your symptoms, risk factors and examination. 2. Use a Medicare-enrolled sleep lab or supplier. 3. Make sure the order includes the specific test and the clinical reason. 4. Ask whether prior authorisation is required. 5. Keep copies of the order, the study report and the CPAP data. 6. If denied, ask for the reason in writing and whether you can appeal. Our article on [whether insurance covers sleep studies](https://findsleepdoctors.com/articles/does-insurance-cover-sleep-studies) explains the general authorisation process. ## Australia's Medicare is different If you are in Australia, "Medicare" refers to the public health scheme, not the US program. A GP referral is generally needed for a specialist or sleep study rebate, and the rebate may not cover the full fee. Private sleep labs set their own prices. Do not apply US Medicare rules to the Australian system. ## Questions to ask your clinic 1. Is this test covered by Medicare for my situation? 2. Does the order need prior authorisation? 3. Is the lab or supplier Medicare-enrolled? 4. What will I owe after Medicare pays? 5. What are the CPAP adherence requirements, and how are they monitored? 6. What happens if the claim is denied? For local options, browse our [sleep doctor directory](https://findsleepdoctors.com/sleep-doctor-near-me). Coverage rules change, so confirm the current requirements with Medicare or your plan. ## Supplies and replacement parts Medicare coverage for CPAP includes the machine and some supplies, but replacement schedules and documentation rules apply. Ask your supplier what is covered, how often, and whether a new prescription or office visit is needed. Keep a record of when you received each item. If a claim is denied, the supplier can help you understand whether the issue is documentation, timing or eligibility. Our guide to [CPAP prescriptions](https://findsleepdoctors.com/articles/cpap-prescription-what-it-includes) explains the paperwork. ## Frequently Asked Questions ### Does Medicare cover sleep studies? US Medicare Part B covers sleep studies when they are medically necessary, ordered by a treating physician and documented according to its criteria. Home tests are covered in specific circumstances. Medicare Advantage plans may have additional rules. ### How long does Medicare cover CPAP? Coverage continues as long as the equipment is medically necessary and you meet the adherence requirements. There is usually an initial trial period, after which continued coverage depends on documented use. ### What is the 4-hour rule for CPAP? Medicare generally requires at least 4 hours of CPAP use per night on at least 70% of nights during the initial trial period. The rule applies to coverage, not to what counts as good clinical care for every patient. ### Does Medicare cover a home sleep test? It can, when the criteria are met and the test is ordered by a treating physician. It is usually for adults with a high probability of moderate to severe obstructive sleep apnea and no conditions that make home testing unreliable. ### What if my Medicare claim is denied? Ask for the denial reason in writing. You may be able to appeal or provide additional documentation. The clinic and supplier can help you understand the options. ### Does Medicare cover oral appliances for sleep apnea? Coverage varies. Some Medicare Advantage plans may cover oral appliances when criteria are met; Original Medicare coverage is more limited. Check with your plan before starting dental treatment. *This article is general information, not medical advice. It does not replace an assessment by a qualified clinician who can review your history, medications and test results.* ## Related guides in this series - [Sleep Doctors in Edina, Minnesota: How to Find the Right Specialist](https://findsleepdoctors.com/articles/sleep-doctors-edina-mn-us) — Edina, Minnesota lists 8 sleep providers and centers in the Find Sleep Doctors directory. This guide explains how to compare them, what to expect, and how to prepare before booking. - [Sleep Doctors in Helena, Montana: How to Find the Right Specialist](https://findsleepdoctors.com/articles/sleep-doctors-helena-mt-us) — A directory guide to 8 listed sleep providers and centers in Helena, Montana, with contact details and practical booking questions. - [Sleep Doctors in Burnsville, Minnesota: How to Find the Right Specialist](https://findsleepdoctors.com/articles/sleep-doctors-burnsville-mn-us) — This guide lists eight sleep providers and centers in Burnsville, Minnesota, with addresses and phone numbers from the Find Sleep Doctors directory. It also explains how to compare options, plan a visit, and prepare questions for a sleep medicine appointment. ## Ready to find a sleep doctor near you? Browse sleep medicine doctors across six countries, organized by region and city, and reach out directly — all in one free, verified directory. See [all countries and cities](https://findsleepdoctors.com/sleep-doctor-near-me). This medical guide reflects generally accepted clinical guidance for sleep disorders. It is informational and not a substitute for personalised medical advice — consult a qualified sleep specialist or your GP. ## Related - [All sleep health guides](https://findsleepdoctors.com/articles) - [Home](https://findsleepdoctors.com/) - [Country and city index](https://findsleepdoctors.com/sleep-doctor-near-me)