Medicare's 13-Month CPAP Rental Hinges on a 90-Day Test
Medicare pays for a CPAP as a 13-month rental, with ownership at the end. A four-hour usage test inside the first 90 days decides whether the payments keep coming.
Medicare rents a CPAP machine for 13 months before ownership transfers to the patient, but a compliance test requiring four hours of use, applied within the first 90 days, can stop those payments before the device is ever owned.
Medicare does not buy a CPAP machine for you. It rents one. The program pays a monthly rental fee to a durable medical equipment supplier for 13 months, and at the end of that stretch the machine becomes the patient's property outright. It is one of the more generous arrangements in the Medicare benefit: sit through a little over a year of rental payments and you own a device you never wrote a check for.
What most new patients are not told, in any way that sticks, is that the arrangement carries a test. Medicare requires documented use of four hours, applied within the first 90 days of therapy. Fail it, and the payments stop — not at month 13, but early, long before the machine is yours. The equipment goes back. The clock does not restart on its own.
How the rental actually works
The structure matters because it determines who is holding the financial risk at each stage. During the 13-month rental period, the supplier owns the machine and bills Medicare monthly. The patient is responsible for the standard Part B cost-sharing on those rental payments, plus the supplies — masks, cushions, tubing, filters — that are billed separately and continue indefinitely, including after ownership transfers.
Ownership at month 13 is the payoff. Once the title moves to the patient, the rental billing ends. The machine is theirs to keep, use, and eventually replace on Medicare's own schedule for reasonable useful lifetime. Nobody can repossess it.
Before month 13, though, nothing is settled. The device in the bedroom belongs to the supplier, and the supplier's ability to keep billing depends on documentation that the patient is using it. That is the pressure point the compliance test creates, and it sits entirely inside the first 90 days.
The four-hour test and why patients miss it
The adherence requirement is deceptively simple to state and surprisingly easy to fail. Medicare looks for four hours of use, measured within that first 90-day window. Modern CPAP machines log this automatically — a modem or SD card transmits nightly usage data back to the supplier, which passes it to the physician and, when audited, to Medicare. There is no self-reporting and no benefit of the doubt. The machine keeps the record.
The failure modes are mundane. A new patient takes several weeks to find a mask that does not leak or leave marks. Someone rips the mask off at 3 a.m. and logs two hours instead of four. A traveler leaves the machine at home for ten nights. A patient with claustrophobia builds up tolerance gradually, starting at an hour a night and working upward — a clinically reasonable approach that produces a non-compliant data file.
None of that is laziness, and all of it is invisible to the billing system. As 24/7 Wall St put it, the test is buried inside an arrangement that most new patients never hear about until they have already failed it and the payments have stopped.
What happens when the payments stop
When Medicare determines the compliance criteria were not met, coverage for the rental ends. The practical consequences arrive in a sequence that catches people off guard.
- The machine goes back. It was never the patient's. The supplier retrieves it, and a patient with diagnosed sleep apnea is suddenly untreated.
- The rental credit does not carry over. Months already paid do not bank toward a future 13-month cycle in any automatic way.
- Re-qualification is a clinical process, not a phone call. Restarting typically means a new face-to-face visit with the treating physician and a fresh demonstration that therapy is warranted — paperwork that takes time the patient spends without a machine.
- Supplies stop too. Mask and tubing replacement schedules are tied to active therapy coverage.
When Medicare determines the compliance criteria were not met, coverage for the rental ends.
There is also a retroactive risk that patients rarely anticipate. If a supplier billed rental months that an audit later deems non-covered, those claims can be recouped. The supplier absorbs that loss, which is precisely why suppliers police compliance aggressively — the automated texts, the portal nags, the calls after a few short nights are not customer service. They are the supplier protecting its own receivables.
The cost exposure on both sides of the transaction
For the patient, the worst outcome is not a bill. It is an interruption in treatment for a condition that carries cardiovascular and daytime-safety consequences, followed by a restart that can leave weeks or months of untreated nights in between. The alternative — buying a machine outright and skipping Medicare entirely — converts an eventual free device into an immediate out-of-pocket purchase, which is a real option for some patients but a poor default.
For the durable medical equipment industry, adherence monitoring has become a core operational function rather than a clinical courtesy. Every rental month that gets denied is revenue booked and then clawed back, and the compliance window is short enough that the burden of chasing patients falls in the first quarter of the relationship, when acquisition costs are highest. That economics shapes the entire onboarding experience: the setup call, the mask-fitting follow-up, the 30-day check-in all exist because the 90-day test exists.
The practical defense
The whole thing turns on the first three months, so the response is concentrated there. Treat mask fit as urgent rather than something to live with — a leaking mask is the single most common reason usage hours fall short, and suppliers will swap sizes and styles during the trial period. Ask the supplier directly how usage data is being transmitted and request a reading of the current numbers rather than assuming silence means success. If the machine will be away from home, ask whether travel nights count and how the data gap will be documented.
Above all, ask for the dates. The 90-day window and the 13-month rental term both have specific start points tied to the date therapy began, and patients who know those two dates have essentially all the information the billing system is using against them. Most people discover the deadlines after they have passed. The ones who ask at setup almost never fail.
The wider backdrop
The CPAP rental rule is a small piece of a much larger machinery of Medicare documentation requirements, and it is a useful illustration of how the program's cost controls land on individuals. The rule exists for a defensible reason — Medicare does not want to buy machines that end up in closets — but the enforcement mechanism assumes a patient who adapts to therapy on a schedule, and adaptation is not uniform.
Markets, for their part, spent the session on a different set of concerns entirely. The S&P 500 tracker closed at $771.35, up 0.54% on the day, with the Dow 30 fund at $517.49, up 0.94%, and the Nasdaq 100 fund at $744.50, up 0.46%, as of 20:00 GMT on Sept. 25, 2026. Health care policy details of this kind rarely move a tape. They move household finances, one 90-day window at a time.
Key facts
- Rental period: 13 months, after which ownership of the CPAP transfers to the patient
- Compliance test: Four hours of documented use, applied within the first 90 days of therapy
- Penalty for failure: Medicare payments stop before ownership transfers; the machine returns to the supplier
- Market close (Sept. 25, 2026, 20:00 GMT): S&P 500 (SPY) $771.35, +0.54%; Dow 30 (DIA) $517.49, +0.94%
Frequently asked questions
Does Medicare buy a CPAP machine outright?
No. Medicare pays for a CPAP as a rental. A durable medical equipment supplier bills Medicare monthly for 13 months, and only at the end of that period does ownership of the machine transfer to the patient. Until then the supplier owns the device and the patient pays standard Part B cost-sharing on the rental.
What is the four-hour compliance test?
Medicare requires documented use of four hours, applied within the first 90 days of therapy. CPAP machines record nightly usage automatically and transmit it to the supplier, so the determination is made from machine data rather than patient self-reporting. Falling short of the requirement can end Medicare's payments for the rental.
What happens if a patient fails the compliance test?
Medicare stops paying for the rental before the 13-month term is complete, meaning ownership never transfers. Because the supplier still owns the machine during the rental period, the device is retrieved. The patient must then re-qualify through their treating physician to restart coverage, leaving a gap in treatment.
Do the rental months already paid count toward a restart?
Months already billed do not automatically carry over into a new 13-month cycle. A patient who fails the compliance test and later re-qualifies is generally starting the rental arrangement again rather than resuming where it stopped, which pushes the ownership date substantially further out.
Why do CPAP suppliers chase patients about usage?
Rental claims that an audit deems non-covered can be recouped from the supplier, so the supplier carries the financial risk of a patient's non-compliance. The setup calls, mask-fitting follow-ups and automated usage reminders in the first weeks of therapy exist largely to protect the supplier's revenue on those rental months.
Can a patient just buy a CPAP instead?
Yes, buying outright is possible and avoids the compliance machinery entirely, but it converts what would eventually be a free device into an immediate out-of-pocket purchase. For most patients the rental path is cheaper overall, provided the four-hour requirement inside the first 90 days is met.
