Buying CPAP Supplies and Replacement Parts by Mail Order
A CPAP machine is a one-time purchase; the mask, tubing, and filters that keep it working are a recurring mail order most users underbuy or overbuy without realizing it.
Sleep apnea therapy is unusual among home medical equipment in how much of its ongoing cost sits in consumable parts rather than the machine itself. A mask cushion breaks down long before it looks worn, tubing develops pinholes that leak pressure silently, and filters clog in ways that make the machine work harder without any obvious symptom until sleep quality quietly degrades. Because none of this failure is dramatic, a lot of CPAP users keep using worn supplies well past the point they should have reordered, simply because nothing broke outright.
The replacement schedule insurers actually use
- Mask cushions: typically every two weeks to one month, since this is the part in direct skin contact and the one that loses its seal first, leading to air leaks that reduce therapy effectiveness.
- Full mask or headgear: roughly every three to six months, as the silicone hardens and straps lose elasticity, both of which degrade seal and comfort gradually rather than all at once.
- Tubing: about every three months, since heated tubing in particular develops small cracks that leak pressure without any obvious visible sign.
- Disposable filters: every two weeks; reusable filters every six months, cleaned regularly in between — a clogged filter forces the motor to work harder and can shorten the machine's own lifespan, not just reduce therapy quality.
Medicare and most private insurers will cover replacement supplies on close to this same schedule, but only through a durable medical equipment supplier enrolled for CPAP coverage, and only if you're actively using the machine enough to meet ongoing compliance requirements. A gap in usage data — the machine tracks this automatically and reports it back to your supplier — can pause insurance coverage for replacement supplies even while the need for them continues, which catches people off guard who assume coverage is unconditional once therapy starts.
What requires a prescription and what doesn't
The CPAP machine itself is a prescription medical device and cannot be ordered without one, along with your specific pressure settings, which is why a legitimate seller will ask for physician information before shipping a machine, similar to the process covered in our guide on buying contact lenses by mail order. Masks, tubing, and filters, however, are typically sold without requiring a fresh prescription each time, since they're accessories to an already-prescribed device rather than devices themselves — though insurance reimbursement for them still runs through the same supplier and documentation trail as the machine.
Buying off-insurance versus through a DME supplier
Buying CPAP supplies directly online, outside the insurance and DME supplier system, is legal and often faster, and is a reasonable choice for anyone whose insurance replacement cadence doesn't match how quickly their own supplies actually wear out, or who has a high deductible that makes cash pricing comparable to the insurance copay anyway. The tradeoff is that direct purchases don't count against insurance-covered quantities and won't show up in your compliance data the way a DME supplier's shipment does, which matters if your employer or insurer requires documented compliance for continued coverage of the machine itself. Comparing the two paths before defaulting to whichever one your original supplier set up is worth the ten minutes it takes, much like the comparison worth doing in our guide on comparing mail-order pharmacies.
Mask sizing without a fitting appointment
Nasal, nasal pillow, and full-face masks each fit a different sleep and breathing pattern, and ordering the wrong style by mail is a common reason a new mask ends up unused in a drawer within a month. A full-face mask is generally the right call for anyone who breathes through their mouth at night or has nasal congestion issues, since a nasal-only mask depends on the nose staying clear all night to work at all. Nasal pillow masks sit lightly at the base of the nostrils and suit side sleepers and anyone bothered by a bulkier mask touching the cheeks, but they deliver pressure more directly and can feel uncomfortable at higher prescribed pressures. Most manufacturers publish a sizing template you print at actual scale and hold against your face before ordering — skipping this step and guessing from a size chart based on general face shape is the single most common cause of a mask that leaks around the seal once it's actually in use overnight.
Because mask fit is so individual, some suppliers offer a one-time fit exchange even outside their standard return window specifically for sizing issues discovered after the first several nights of use — worth asking about directly before ordering a full-face mask for the first time, since these tend to have the narrowest margin for a sizing miss of any CPAP accessory.