Medicare CPAP Supplies: Replacement Schedule and Coverage

Quick answer: Medicare Part B generally covers CPAP supplies when you have a qualifying diagnosis, a current prescription, and documented compliance. Most suppliers follow a replacement schedule for masks, cushions, tubing, filters, and headgear, but the exact intervals come from the supplier and the local coverage rules, not from a single national calendar. You usually pay 20% of the approved amount after your deductible, and Medicare Advantage plans can set their own rules.

What Medicare covers

Medicare covers CPAP therapy as durable medical equipment when a clinician documents obstructive sleep apnea and you meet the coverage criteria. That includes the machine, humidifier, mask, tubing, filters, and other parts needed to use it. Supplies are covered separately from the machine, and they are replaced on a schedule rather than all at once.

The machine itself is typically rented for a period before you own it, or purchased outright depending on the supplier and your plan. Supplies continue as long as the therapy is medically necessary and your documentation is current.

Original Medicare is not the only payer. If you have a Medicare Advantage plan, the plan may use different suppliers, different prior authorization rules, and a different replacement schedule. Call the number on your card before you order.

The replacement intervals you will see most often

Medicare contractors publish local coverage determinations that list suggested replacement frequencies. Many suppliers use a schedule close to this one, but intervals can vary by contractor and by the specific product:

• CPAP machine: generally every five years, with repairs covered in between
• Humidifier chamber: often every six months, sometimes less often
• Tubing: commonly every three months
• Disposable filters: often two per month; reusable filters less often
• Nasal mask or full-face mask: commonly every three months
• Nasal pillows: often two per month
• Mask cushion: often two per month, depending on the mask
• Headgear: commonly every six months
• Chin strap: commonly every six months

These are generalization points, not a promise. A supplier cannot bill Medicare for a replacement before the allowed interval unless the old item is lost, damaged, or no longer medically appropriate, and the documentation says so. Ask your supplier which schedule they follow and get the date of your last shipment.

The compliance rule that keeps supplies coming

After you start CPAP, Medicare requires a face-to-face visit with your treating clinician, usually between the 31st and 91st day after you begin therapy. The clinician documents that you are benefiting from treatment and that you are using it. Suppliers also need objective adherence data from the machine.

The common standard is at least four hours of use per night on at least 70% of nights over a 30-day period. That is a coverage rule, not a treatment goal. Four hours is the minimum some payers look for; it is not the amount that gives you the best chance of feeling better.

If you travel, miss nights, or take the mask off in your sleep, the data can fall short. Talk to your clinician before the visit if you are struggling. A mask that hurts or a machine that feels unbearable is a fixable problem, and addressing it is better than quietly falling below the threshold.

What you pay

With original Medicare, you generally pay 20% of the Medicare-approved amount after the Part B deductible. If the supplier accepts assignment, they cannot charge you more than that. If they do not accept assignment, you may pay more, so ask first.

Supplies shipped to your home are usually billed the same way. A supplier may ask you to sign a delivery ticket or confirm receipt. Keep those records. If a shipment arrives that you did not order, call the supplier rather than assuming it is free.

Medicare Advantage plans often use copays rather than 20% coinsurance, and some require prior authorization for supplies. Medicaid and commercial plans vary widely. The rules for starting CPAP therapy are separate from the rules for replacement parts, so do not assume a supply order is covered just because the machine was.

How to order without a surprise bill

1. Confirm that the supplier is in your plan's network and accepts assignment.
2. Ask which items are due under the replacement schedule and which are not.
3. Ask for the price before tax and shipping, and confirm what your plan will pay.
4. Check that your prescription and compliance documentation are on file.
5. Keep the packing slip and explanation of benefits.

If you need supplies and do not have a regular supplier, CPAP supplies near you can help you find local options. For the bigger picture on machine costs, see our guide to CPAP costs with insurance.

What to do if a claim is denied

A denial is often a paperwork problem rather than a decision that you do not need the equipment. Common reasons include missing compliance data, a prescription that is too old, a supplier that is out of network, or a replacement shipped before the allowed date.

Ask the supplier and your plan for the specific reason in writing. Then call your clinician's office and ask them to send the missing documentation. If the denial stands, you can file an appeal; the explanation of benefits includes instructions and deadlines.

Do not stop using CPAP while a claim is sorted out unless your clinician tells you to. Untreated sleep apnea can affect blood pressure, heart rhythm, daytime alertness, and safety behind the wheel.

Frequently Asked Questions

Does Medicare cover CPAP supplies every month?

No. Supplies are replaced on a schedule, not monthly across the board. Cushions and nasal pillows may be allowed more often than tubing or headgear. Your supplier and the local coverage rules determine what is due, and billing too early can trigger a denial.

How many hours a night does Medicare require for CPAP?

The common coverage standard is at least four hours per night on at least 70% of nights during a 30-day period. That is a payer rule, not a treatment target. Aim for full-night use if you can tolerate it.

Do I need a new sleep study to keep getting supplies?

Usually not. You need an ongoing prescription and documentation that CPAP is medically necessary. A new study may be required if your clinician suspects a change in your condition or if your plan specifically asks for one.

What is the 90-day CPAP rule?

After you start CPAP, Medicare generally requires a clinical visit around the 31st to 91st day to document benefit and adherence. The exact timing and documentation requirements come from your plan and supplier.

Can I use my Medicare Advantage plan for CPAP supplies?

Yes, but the plan may have its own network, prior authorization, and replacement rules. Call the member services number on your card and confirm the supplier before you order.

What if I lose or break a mask before the replacement date?

Medicare may cover an early replacement when the item is lost, damaged, or no longer fits, if the supplier documents the reason. Call your supplier and explain what happened rather than ordering on your own.

This article is general information, not medical advice. Symptoms, testing, and treatment decisions depend on your own history, so talk with a clinician who can evaluate you.

Related reading

• Find CPAP supplies near you
• CPAP therapy: getting started and sticking with it