CPAP Supply Replacement Schedule: When to Change Masks, Filters & Tubing

Continuous positive airway pressure (CPAP) therapy works only as well as the equipment delivering it. A worn-out mask cushion leaks. A clogged filter cuts pressure delivery. Old tubing harbors mold. Yet most CPAP users dramatically under-replace supplies — partly because nobody told them the schedule, partly because insurance coverage timelines are confusing, and partly because a leaking mask still kinda works.

This guide covers the replacement schedule recommended by the American Academy of Sleep Medicine and major manufacturers, what Medicare and private insurance typically cover, the warning signs that a part is overdue, and how to clean what you have between replacements.

The standard replacement schedule

Every CPAP component has a useful life that’s shorter than most users assume. The schedule below combines AASM clinical guidance with the resupply intervals Medicare covers for in-network durable medical equipment suppliers:

• Mask cushion (silicone or memory foam): Replace every 2 weeks for nasal pillows, every month for nasal masks, every month for full-face cushions. The silicone hardens and develops micro-leaks well before it looks worn out.
• Mask frame and headgear: Replace every 3-6 months. The frame loses its shape, the headgear loses elasticity, and your seal degrades.
• Tubing (standard or heated): Replace every 3 months. Plastic clouds, biofilm builds up, and tiny cracks develop in heated lines.
• Disposable filter (fine particulate, usually white): Replace every 2 weeks.
• Reusable filter (foam, usually gray): Wash weekly, replace every 6 months.
• Water chamber (humidifier): Replace every 6 months. Mineral buildup compromises the heating element and the chamber walls develop a haze that won’t scrub off.
• Chin strap (if used): Replace every 6 months — the elastic stretches.
• Whole CPAP machine: Most are warrantied for 5 years; insurance typically funds replacement at 5 years.

Medicare and private insurance coverage

Medicare Part B covers CPAP supplies as durable medical equipment with the following typical schedule (this is what your DME supplier actually bills):

• Nasal pillows: 2 sets per month
• Nasal mask cushions: 2 per month
• Full-face cushions: 1 per month
• Mask frame / headgear: 1 every 6 months
• Tubing: 1 every 3 months
• Disposable filters: 2 per month
• Reusable filters: 1 every 6 months
• Water chamber: 1 every 6 months

You’ll pay 20% coinsurance after meeting the Part B deductible. Most private insurance and Medicare Advantage plans follow similar schedules; check your specific plan’s DME benefit.

The cost trap: most DME suppliers send a resupply only when you call. They don’t ship automatically. The result is that most users go 6-12 months between resupplies, getting half of what their insurance would pay for. Set a calendar reminder for the first of every month — one phone call refills everything that’s due.

Warning signs you’re overdue

Mask leaks

If you wake to a hissing sound, feel air on your eyes, or notice your AHI creeping up on your machine app, the cushion is hardened or the headgear is stretched. Most machines log “leak rate” in their nightly report — aim for under 24 L/min. Anything sustained over that means a new cushion is overdue.

Mask marks lasting past breakfast

A mask shouldn’t leave deep impression lines that take more than 30 minutes to fade. If yours does, you’re overtightening to compensate for a worn cushion. Loosen the straps, replace the cushion, retest.

Skin breakdown on the bridge of the nose

The bridge of the nose is the most common point of skin damage. If you have pressure sores or breakdown, you need a new cushion size or style — not more padding. Talk to your CPAP supplier about a mask fitting.

Dry mouth, dry throat, nasal congestion

Often a humidifier issue, but also a sign of mouth-leaking from a poorly-fitting mask. If you switched to full-face from nasal expecting it to solve dry mouth and it didn’t, the full-face cushion may be leaking around the chin.

Audible machine noise change

A CPAP that suddenly sounds louder or whinier has a clogged filter or a clouded tubing fitting. New filter first; if that doesn’t fix it, new tubing.

Higher AHI on your nightly report

If your apnea-hypopnea index (events per hour) was running 2-3 for months and suddenly jumps to 8-10 with no other changes, equipment degradation is the most likely cause. Pressure delivery is being compromised by leaks or filter clogs.

Cleaning what you have between replacements

Daily

• Empty the water chamber, refill only when you start the machine again.
• Wipe the mask cushion with a CPAP-safe wipe or a damp cloth.

Weekly

• Wash the mask cushion, frame, and headgear in warm soapy water (mild dish soap), rinse thoroughly, air dry.
• Wash the water chamber in warm soapy water; let it fully dry before refilling.
• Rinse the tubing with warm water, hang to dry.
• Wash the reusable filter (if you have one) in warm water, let dry completely before reinserting.

Monthly

• Soak the water chamber and tubing for 30 minutes in a 1:3 white vinegar to water solution to dissolve mineral buildup. Rinse thoroughly.

UV sanitizers and ozone cleaners: skip them

The CPAP cleaner industry sold a generation of users on UV light boxes and ozone-generating cleaners. The FDA has formally warned that ozone-based CPAP cleaners damage equipment (degrade silicone, void warranties) and may produce inhalation hazards. Major manufacturers won’t honor warranties on equipment cleaned with ozone devices.

UV-based cleaners are less harmful but no more effective than soap and water. The CDC’s position is that warm soapy water, used routinely, is the appropriate cleaning method for home respiratory equipment.

Water for the humidifier

Distilled water only. Tap water deposits minerals that wreck the water chamber within months and may aerosolize bacteria. Distilled is $1-2 per gallon at any grocery store; one gallon lasts most users about 2 weeks.

If you forget and use tap once, no disaster — rinse and resume distilled. If you’ve been using tap for months, soak the chamber in vinegar solution (above) and assess; if there’s visible scaling, replace the chamber.

Travel considerations

TSA explicitly allows CPAP machines as carry-on, exempt from the liquids rule (the distilled water counts as a medical liquid). Carry the prescription card the manufacturer ships with the machine for any international travel hassles. Battery packs are available for camping or air travel without seat power. Don’t skip CPAP nights — even one night without it raises blood pressure for days afterward.

FAQ

My insurance only covers one mask per quarter. Can that really be enough?

For some plans, that’s the bare minimum coverage rather than the recommended schedule. Call the insurer and ask about CPAP supply benefits specifically — many plans have a higher allowance under DME that the default resupply paperwork doesn’t trigger. If the answer is genuinely one per quarter, the deficit is on you to budget for — out-of-pocket cushions are $20-40 each.

The DME supplier’s resupply costs feel high. Can I just buy supplies online?

You can buy CPAP supplies without a prescription from several major online retailers, and prices are often half of what the DME supplier bills. The trade-off: you pay full out-of-pocket; insurance only covers items dispensed by an enrolled supplier. For someone on Medicare, going through the DME supplier and paying the 20% coinsurance is usually cheaper than out-of-pocket online. For someone with a high-deductible private plan, online may win.

How do I know what mask size I am?

The DME supplier’s respiratory therapist should have sized you when you first got the machine. If you’ve gained or lost significant weight, the size may need to change. Most manufacturers offer mask fit guides on their websites; some offer a free “mask fit pack” that includes three sizes to try.

Can I switch mask styles (nasal to full face) without a new prescription?

You may need a new prescription depending on your state and insurance. Functionally, switching styles is fine and sometimes solves persistent problems (dry mouth, jaw drop). Check with your DME supplier first.

I’ve been using my CPAP for 7 years. Should I get a new machine?

Probably yes. Insurance typically funds a new machine at the 5-year mark. Newer machines have better humidification, quieter motors, smarter pressure adjustment, and connected apps that make it much easier to track your therapy. If you’re still wearing the original mask and tubing, you’re overdue regardless — see why you can’t stay asleep after 50 if you’re still having sleep maintenance issues even on therapy.