CPAP supplies are replacement parts and everyday items that keep your CPAP machine and mask working as intended—things like cushions or nasal pillows, headgear, filters, tubing/hoses, and cleaning supplies. Before buying, match the item to your exact machine or mask model name and the correct size where applicable. 
The safest approach is to match the exact product family + model (machine or mask) and then match the part type (cushion vs frame vs elbow vs headgear) and size if the part is size-specific. If the listing doesn’t clearly state compatibility, don’t guess—parts usually don’t cross over between different mask styles. 
If your seal changed, start with the replaceable interface that touches your face (nasal cushion, nasal pillows, or full face cushion) and then check headgear stretch and how the frame/elbow clicks together. A worn cushion can change fit even if the mask looks fine, and a loose connection can mimic a leak. 
Start with filters, then inspect your tubing/hose for wear, pinholes, or loose ends that can create small leaks. These are common “performance” items that can affect noise and airflow without changing your pressure settings, and they’re usually the first things to swap when your setup starts feeling off. 
Standard tubing is the basic air path, while heated tubing is designed to work with compatible humidification systems to help reduce condensation (“rainout”) and stabilize moisture delivery. Only buy heated tubing or humidifier-specific supplies if your CPAP machine supports that exact heated-hose system—many are model-specific. 
In the U.S., you generally need an Rx for a CPAP machine and often for a complete CPAP mask system, but many replacement parts (like cushions, headgear, and frames) and common accessories are sold without a prescription. If you’re buying a full mask kit, assume an Rx may be required and check the product’s requirement notes. 
Replacement timing depends on the item, how quickly it wears, and your cleaning routine, but insurers often follow defined resupply schedules for mask components, filters, tubing, and headgear. If you use Medicare, the program uses a standardized replacement schedule for many common parts—use that as a planning baseline and adjust if your equipment wears faster. 
Many CPAP-related purchases can qualify as medical expenses, and HSAs/FSAs commonly cover medically necessary equipment used to treat conditions like sleep apnea. Eligibility can depend on plan rules and documentation, so keep your itemized receipt and, if required, your prescription or medical-need record for substantiation. 
Medicare Part B can cover CPAP-related supplies (like masks and tubing) when coverage criteria are met; after you meet the Part B deductible, you typically pay 20% of the Medicare-approved amount if the supplier accepts assignment. CPAP machines are usually rented for 13 months while you continue using them, and supplies are covered alongside that process. 
Local options include accredited medical equipment suppliers and some sleep clinics, while online retailers can be convenient for model-specific parts shipped to you. Before choosing, check that the seller supports your exact machine/mask model, review shipping timelines for critical replacements, and confirm return rules for opened items—especially for mask components. 
