Does Medicare Cover a CPAP Machine for Sleep Apnea and the 90-Day Compliance Trap

Medicare Part B covers CPAP machines for sleep apnea under its Durable Medical Equipment (DME) benefit - but coverage comes with a compliance test that starts on day one. You must use your CPAP for at least 4 hours per night on 70% of nights (21 of 30) during the first 90 days, or Medicare stops paying and the supplier may reclaim the equipment. In 2026, Medicare pays 80% of the approved cost after your $257 Part B deductible; patients with Medigap Plan G pay only the deductible and nothing more for the 13-month rental period.

Does Medicare Cover CPAP Machines for Sleep Apnea?

Yes - Medicare Part B covers CPAP machines as Durable Medical Equipment (DME), the same benefit category that covers wheelchairs, walkers, and hospital beds.

But coverage is conditional. You need to meet specific medical criteria, get a prescription from a doctor, and use a supplier that is enrolled in Medicare before a single dollar gets paid, as of June 2026.

To qualify, your doctor must diagnose you with obstructive sleep apnea (OSA) - a condition where your airway collapses repeatedly while you sleep, causing your breathing to stop and restart throughout the night. That diagnosis has to come from an approved sleep study. Medicare accepts four types, as confirmed by CMS.gov: an in-lab polysomnography (Type I), or a home sleep test using a Type II, III, or IV monitoring device that measures at least three channels of data.

Your sleep study results need to show an Apnea-Hypopnea Index (AHI) - the number of breathing interruptions per hour - that meets Medicare's thresholds. According to CMS's National Coverage Analysis for CPAP Therapy, you qualify if:

• Your AHI is 15 or more events per hour (regardless of symptoms), or
• Your AHI is between 5 and 14 events per hour and you have documented symptoms such as excessive daytime sleepiness, impaired cognition, mood disorders, insomnia, or documented conditions like high blood pressure, ischemic heart disease, or a history of stroke

Once you have a qualifying sleep study and prescription, your doctor sends the order to a Medicare-enrolled DME supplier. This is where many people stumble - if your supplier is not enrolled in Medicare, Medicare will not pay the claim regardless of whether you otherwise qualify. If your DME supplier does not accept assignment, Medicare sets no limit on what they can charge you, and you could owe the entire bill upfront. Always confirm enrollment before accepting any equipment.

Medicare does not allow you to purchase a CPAP machine outright under the benefit. Instead, Medicare pays the supplier to rent the machine on your behalf for 13 months. After 13 continuous months of rental payments - assuming all coverage requirements have been met - the machine becomes your property at no additional cost, per Medicare.gov's official coverage guidance.

If you have a Medigap supplemental policy, it may eliminate or reduce that 20%. Medigap Plan G covers the 20% co-insurance but not the deductible, so after paying $257 once per year, your co-insurance is $0. If you have Medicare Advantage, your plan has its own DME cost structure - check your Evidence of Coverage document for your specific co-pay amounts.

What Is the 90-Day Compliance Trap - And Why So Many People Lose Their CPAP?

In short: What Is the 90-Day Compliance Trap - And Why So Many People Lose Their CPAP?: Here is what catches people off guard.

Here is what catches people off guard. Medicare does not simply hand you a CPAP and assume you will use it. During the first 90 days of your rental, it requires you to prove the machine is helping you - and it measures that through a strict compliance check that has real consequences if you miss it.

The rule comes from Medicare's Local Coverage Determination (LCD): you must use the CPAP for at least 4 hours per night on 70% of nights during any consecutive 30-day period within the first 90 days of use. In plain math, that means at least 21 out of every 30 nights, for a minimum of 4 hours each night. You can technically miss up to 9 nights per month and still be compliant - but only if every night you do use the machine, you hit the 4-hour mark.

That sounds manageable until you picture what actually happens when someone first brings a CPAP home. The mask feels foreign. You wake up at 2 a.m. and pull it off. You travel for a week and leave the machine behind. You get a respiratory infection and cannot breathe through the mask. Every one of those nights counts against your compliance record from day one.

Why does Medicare have this rule? The short answer is that CPAP only works when you wear it. Sleep apnea therapy is highly effective for reducing cardiovascular risk, improving daytime alertness, and lowering blood pressure - but only when the machine is actually being used. Medicare designed the compliance requirement to ensure the benefit goes to patients who are getting real value from the equipment.

The problem is that new CPAP users typically need an adjustment period to find the right mask style, pressure setting, and sleeping position. That learning curve often falls squarely within the 90-day compliance window. By the time some patients realize they are struggling with adherence, their compliance data has already been recorded - and may have already triggered a coverage issue.

Related: How to Appeal a Medicare Denial: Step-by-Step for 2026

How Does Medicare Track Whether You're Using Your CPAP?

In short: How Does Medicare Track Whether You're Using Your CPAP?: This is where modern technology and Medicare policy intersect in a way most patients never expected.

This is where modern technology and Medicare policy intersect in a way most patients never expected.

Every CPAP machine prescribed under Medicare contains a built-in data recording chip - sometimes called a wireless modem or smart card - that automatically logs the date, the session duration, your mask leak rate, average pressure, and your AHI while wearing the device. The machine is quietly measuring your therapy every single night.

Your DME supplier can access this data remotely using cellular transmission, or download it directly from a data card during a visit. More importantly, your prescribing doctor must review this compliance data at a required follow-up appointment that Medicare says must occur between 31 and 91 days after you start using the CPAP.

At that appointment, your doctor must document two specific things to authorize the rental to continue beyond the initial period:

1. That you met the usage threshold - 4 or more hours per night on 70% or more of nights during the first 90 days
2. That you are benefiting from therapy - your symptoms have improved, your sleep quality is better, or the data shows your AHI has dropped while on CPAP therapy

If your doctor does not submit this documentation within the required window, or if the data shows inadequate usage, Medicare will not authorize continuation of the rental. This is not a warning - it is an automatic cutoff. The supplier stops billing Medicare. Your rental coverage ends.

One more thing to watch: if your mask does not fit correctly and air is leaking around the edges, that affects your recorded data too. High mask leak rates can compromise the accuracy of your AHI readings and affect how your compliance is interpreted. Getting the right mask fit at the start is not just about comfort - it is about protecting your coverage.

What Happens If You Fail the 90-Day Compliance Check?

In short: What Happens If You Fail the 90-Day Compliance Check?: Failing the compliance check has immediate and concrete consequences.

Failing the compliance check has immediate and concrete consequences. As confirmed by Medicare's official coverage documentation and multiple patient accounts, your DME supplier stops billing Medicare for the monthly rental. Because you were renting - not purchasing - the supplier has the right to reclaim the equipment. You do not own it. You have no legal claim to keep it once Medicare stops authorizing the rental.

That said, you are not out of options. Here is what you can do:

• Appeal the denial. If the data was recorded incorrectly, if there was an equipment malfunction, if your mask had a fit problem that has since been corrected, or if there were extenuating circumstances like a hospitalization, you can file a redetermination with Medicare. A patient advocate can help draft this appeal with supporting documentation. According to HHS OIG data, approximately 80% of Medicare appeals succeed at some level when patients submit complete documentation.
• Ask your doctor about restarting. In some cases, your doctor can issue a new CPAP order after addressing the compliance barriers. This starts a fresh 90-day window. This is not guaranteed to be approved, but it is worth a conversation - especially if the original failure was due to a solvable problem like mask intolerance or pressure settings that were never adjusted.
• Get your mask and settings right first. One of the most common compliance failures is not refusal to use the machine - it is physical discomfort that forces the patient to remove the mask before reaching 4 hours. Many people do not realize they can request a different mask style or a pressure titration from their provider during the compliance window.
• Consider Medicare Advantage. Some Medicare Advantage plans handle CPAP compliance verification differently. If you are on traditional Medicare and struggling with the compliance rules, a benefits counselor can help you evaluate whether an Advantage plan might offer a different structure.

How Much Does a CPAP Machine Cost Under Medicare in 2026?

In short: How Much Does a CPAP Machine Cost Under Medicare in 2026?: Let us put real numbers to this.

Let us put real numbers to this. Medicare pays 80% of the approved rental amount after you have met your annual Part B deductible of $257. You pay the remaining 20%.

The Medicare-approved monthly rental fee for a standard CPAP runs roughly $40 to $60 before the deductible. Once you have met the $257 deductible for the year, your 20% share of the monthly rental amounts to about $8 to $12 per month. Over the full 13-month rental period, your total out-of-pocket for the machine itself - not counting supplies - is typically the $257 deductible plus $100 to $150 in co-insurance payments spread across the rental term.

Keep in mind that this covers the machine only. CPAP supplies - masks, tubing, filters, cushions - are billed separately and are also subject to the 80/20 cost split. If you are ordering supplies regularly through Medicare, those co-payments add up over the course of a year. Patients with Medigap Plan G typically see their total annual CPAP out-of-pocket limited to the $257 deductible alone.

Does Medicare Cover CPAP Supplies and Accessories?

In short: Does Medicare Cover CPAP Supplies and Accessories?: Yes - and this is an ongoing benefit many patients forget to use.

Yes - and this is an ongoing benefit many patients forget to use. Medicare Part B covers replacement CPAP supplies on a regular schedule, because masks degrade, tubing develops cracks, and filters collect debris that reduces airflow over time. Using worn-out supplies is not just uncomfortable - it makes the therapy less effective and can affect how the machine reads your AHI.

According to the Medicare.gov coverage schedule, your supply replacements are covered at these intervals - subject to the standard 80/20 co-insurance after your deductible:

You order supplies through your Medicare DME supplier. Some suppliers will contact you proactively when you are due for replacements. Many will not. Know the schedule yourself and call your supplier when you become eligible - supplies are not shipped automatically in most cases.

For continued supply coverage, your doctor must submit an updated prescription every 12 months confirming you still have obstructive sleep apnea and are still on CPAP therapy. This is sometimes called an annual recertification or resupply order. If your doctor does not submit it, Medicare will deny supply claims even if your original coverage is intact. This is a common and easily preventable lapse - put a calendar reminder in the month before your annual anniversary date.

What If Medicare Denies My CPAP Claim?

Medicare denies CPAP claims frequently, and the reasons are usually fixable. The most common causes of denial include:

• Supplier not Medicare-enrolled - the most common and most preventable error
• Sleep study from an unapproved source - facility not certified to conduct Medicare-qualifying tests
• AHI did not meet the threshold - borderline results where the ordering doctor did not document qualifying symptoms
• Prescription missing required elements - must include diagnosis, AHI score, qualifying symptoms, and the specific device type
• Compliance not documented - follow-up appointment was missed or the doctor did not submit the required benefit narrative
• Prior authorization not obtained - especially common with Medicare Advantage plans
• Annual recertification lapsed - doctor did not resubmit the required 12-month prescription renewal

If your claim is denied, you have the right to appeal. Medicare has a formal five-level appeals process for DME claims:

1. Redetermination - file within 120 days of the denial; your supplier can do this or you can file directly; decision in 60 days
2. Reconsideration - if denied again, a Qualified Independent Contractor reviews; file within 180 days; decision in 60 days
3. Administrative Law Judge hearing - available when the amount in dispute exceeds $220 (2026 threshold); file within 60 days; may take several months
4. Medicare Appeals Council - reviews ALJ decisions; file within 60 days
5. Federal District Court - final option when the amount in dispute exceeds $1,760 (2026 threshold)

For most CPAP denials, the redetermination or reconsideration stage is where the issue gets resolved. The key to a winning appeal is complete documentation: the original sleep study results with the AHI score clearly stated, the full prescription with the diagnosis code, confirmation that your supplier is Medicare-enrolled, and the compliance download from your CPAP machine. A patient advocate can pull this package together and write the appeal narrative on your behalf.

Medicare Advantage vs. Traditional Medicare for CPAP Coverage

In short: If you have a Medicare Advantage plan (Part C), your CPAP is still covered - Medicare Advantage must cover everything that original Medicare covers.

If you have a Medicare Advantage plan (Part C), your CPAP is still covered - Medicare Advantage must cover everything that original Medicare covers. But the way coverage is administered can be meaningfully different.

The most significant difference is prior authorization. Many Medicare Advantage plans require you to get approval before your DME supplier delivers the CPAP. Prior authorization typically requires submitting your sleep study results, the prescription, a statement from your doctor about symptoms and treatment rationale, and sometimes a list of other treatments you have tried. Skipping this step, or not realizing it is required, is a fast path to a denial that you then have to appeal.

Medicare Advantage plans also often maintain their own DME supplier networks. If you use an out-of-network supplier, your plan may not cover the claim, or may cover it at a significantly higher cost-share. Always confirm that your supplier is in-network for your specific Advantage plan before accepting equipment.

The compliance requirement - 4 hours per night on 70% of nights in the first 90 days - is the Medicare standard that Advantage plans generally follow, but individual plans may implement it with different tracking requirements or review processes. Call your plan's member services and ask specifically about CPAP compliance monitoring before you begin therapy.

How UnderstoodCare Can Help With Your CPAP Coverage

In short: How UnderstoodCare Can Help With Your CPAP Coverage: Navigating Medicare's CPAP coverage rules on your own is genuinely difficult.

Navigating Medicare's CPAP coverage rules on your own is genuinely difficult. The compliance requirement starts from day one, the tracking is automatic, and by the time most patients realize there is a problem, the coverage has already been interrupted. We help Medicare patients in Florida and across the country navigate exactly these situations - from verifying initial eligibility to appealing denials to protecting compliance during the critical first 90 days.

Here is what our patient advocates can do for you:

• Review your sleep study results and confirm your AHI meets Medicare's criteria before you order equipment
• Verify your DME supplier is Medicare-enrolled and accepts assignment
• Set up reminders for your required 31-91 day follow-up appointment
• Review your CPAP compliance data with you before your doctor visit so there are no surprises
• Draft and submit appeals if your coverage has been interrupted or denied
• Help you understand your specific Medigap or Medicare Advantage plan's DME requirements
• Coordinate with your doctor's office to ensure annual recertification is submitted on time

Call us at 646-904-4027 or visit understoodcare.com to speak with an advocate. We work with Medicare patients directly - there is no charge to you for our advocacy services.

Related: What Does a Medicare Patient Advocate Actually Do?

What Will Change in Medicare CPAP Coverage Over the Next 12-24 Months?

Several forces are shaping how Medicare handles CPAP coverage - and being aware of them now can help you make smarter decisions about your equipment and your plan.

The compliance monitoring gap is under scrutiny. Patient advocates and sleep medicine organizations have raised concerns about the 90-day compliance requirement falling too early in the adjustment process. There is ongoing policy discussion about whether Medicare should build in a formal adaptation period before the compliance clock starts, similar to how some commercial insurers handle new CPAP users. No rule change has been finalized as of mid-2026, but this is a conversation worth tracking if you are struggling with early compliance.

Home sleep testing is becoming the standard. Medicare expanded coverage for home sleep apnea tests (Types II, III, and IV) to make diagnosis more accessible without requiring an overnight lab stay. This trend will continue. If you have not yet been diagnosed, you may be able to complete your sleep study at home rather than in a sleep center - which is faster, less expensive, and easier to schedule. Ask your doctor whether a home test is appropriate for your clinical picture.

Remote monitoring is expanding. The data chip in your CPAP already transmits usage data wirelessly to your DME supplier and, in some setups, directly to your care team. As telehealth infrastructure matures, expect more proactive compliance monitoring - meaning your doctor's office may contact you earlier if your data shows a compliance risk, rather than waiting for the 31-91 day follow-up to surface a problem. This is a meaningful shift from reactive to preventive coverage management.

Medicare Advantage prior authorization rules are changing. The 2024 and 2025 Medicare Advantage reforms reduced how broadly plans can apply prior authorization for DME - but the rules still allow prior auth for CPAP in many plans. The 2026 reforms continued tightening these requirements. If you are on Medicare Advantage and your CPAP prior authorization was recently denied, it is worth reviewing whether the denial complies with the updated CMS guidelines. A patient advocate can help you evaluate this.

What to Do Next

In short: What to Do Next: If you have been prescribed a CPAP and are on Medicare, the single most important thing you can do right now is.

If you have been prescribed a CPAP and are on Medicare, the single most important thing you can do right now is get your DME supplier's Medicare enrollment verified before you accept any equipment. The second most important thing is to schedule your 31-91 day follow-up appointment with your doctor before you ever put on the mask. Both steps take about ten minutes. Both can prevent months of coverage headaches.

If you have already received a denial, or if you are past the 90-day window and worried about your compliance data, call UnderstoodCare at 646-904-4027. Our patient advocates have helped Medicare beneficiaries recover coverage they were told was gone. A denial is not the last word - it is the first step in an appeals process that, with the right documentation, most patients win.

Related: Medicare Part A vs Part B: What Each One Covers and What You Pay