How Often to Replace Each CPAP Supply (Complete Reference)

May 27, 2026·8 min read

Educational content, not medical advice. Schedules and ranges in this article come from manufacturer documentation and public clinical guidelines. Your sleep specialist and DME supplier are the right people to advise on your specific therapy. Full terms.

Every part of your CPAP system has a different lifespan. Some pieces need attention monthly; others last most of a year. Replacing on schedule is the difference between effective therapy and silently degraded therapy — with a softer mask seal, more leaks, and an AHI that creeps up without you knowing why.

This is the at-a-glance reference for every consumable. Manufacturer guidelines, what insurance typically covers in the US, and the symptoms that tell you a part is failing early.

Quick-reference replacement schedule

These follow Medicare's replacement schedule, which most US private insurers also use. Outside the US, your supplier and clinician set the cadence — the lifespans above are still a reasonable hygiene floor regardless of who pays.

By component

Mask cushion

The single most-replaced part of your CPAP. The cushion is the silicone or memory-foam piece that contacts your face. Skin oils and stretching break it down fast — expect a 2-week to 1-month lifespan depending on cushion type.

Replace early when you notice: the cushion is shiny or sticky, you've got new red marks on your face, or you're getting persistent leaks that weren't there before.

Mask frame and full mask assembly

The frame (and any non-cushion silicone) lasts 3 months. Nasal-pillow masks tend to wear faster than full-face because the pillows seal against the more sensitive nostril skin and lose elasticity quickly.

If you replace the cushion but the mask still leaks, the frame may be done. The plastic clips and ports can crack invisibly.

Headgear

The straps stretch out over time. When you can no longer get a comfortable seal at the same strap setting that used to work — or you're cranking the straps tighter and tighter — the elastic is fatigued. 6 months is typical; if you wash your headgear in a washing machine, it can be sooner.

Tubing

The tubing — sometimes called the "hose" — carries pressurized air from the machine to your mask. It harbors moisture, dust, and bacteria over time. After 3 months, even with regular cleaning, internal mold spots can develop where you can't see them.

Heated tubing has the same replacement schedule but is harder on the budget. The heating wire eventually fatigues and the tube can stop reaching its target temperature.

Disposable filter (a.k.a. short-term filter, fine filter)

The small piece of pleated paper/fiber that traps dust and pollen before air enters your machine. Replace every 2 weeks — faster if you have pets, live in a dusty environment, or run the machine in a basement.

Check it monthly even if it's not yet due: a gray or discolored filter is overdue. A filter clogged with dust forces the machine to work harder and reduces airflow at your mask.

Reusable filter (a.k.a. long-term filter, gray filter)

A thicker foam filter that you rinse weekly. Replace every 6 months because the foam compresses and breaks down with repeated wetting. Don't confuse it with the disposable filter — they often sit side-by-side in the same compartment.

Water chamber

Mineral deposits build up in the chamber over months of heating, especially with hard tap water. Cracks can form along the seal line. Replace every 6 months; consider distilled water to extend the chamber's life and reduce buildup.

What if I don't replace on schedule?

The schedule isn't arbitrary — each part has measurable degradation patterns that affect therapy quality:

• Worn cushion → leaks → effective pressure drops → your AHI climbs without you knowing
• Worn headgear → you compensate with strap tightness → red marks, pressure sores, broken sleep
• Old tubing → bacterial colonization → respiratory irritation, more sinus infections
• Old filter → reduced airflow → motor strain, allergens reaching your airway
• Old water chamber → mineral scale → inconsistent humidification, possible chamber crack mid-night

None of these are dramatic in a single night. They compound over weeks, and the slow drift is what makes them dangerous — you adapt to slightly worse therapy and forget what good felt like.

Insurance and reorders

In the US, Medicare and most private insurers follow the schedule above as the maximum frequency they'll reimburse. If you call your DME (durable medical equipment) supplier and ask for a cushion replacement before two weeks, they'll usually decline. After two weeks, they'll ship.

Many suppliers offer auto-ship programs that send your supplies on schedule without you re-ordering. Worth signing up for if your supplier offers it — one less thing to remember.

If you pay out of pocket (uninsured or supplemental), buying in 3- or 6-pack quantities from a reputable online supplier is typically 30-50% cheaper per piece than per-replacement orders.

How to actually remember to replace

Tracking replacement on paper or a spreadsheet works for about three weeks. After that, life happens. A dedicated tracker app handles it — you enter what you have, the app calculates when each part is due, sends a reminder a week before, and (if you opt in) tracks how many spares you have on hand so you can reorder before running out.