Medicare CPAP Compliance: The 90-Day Rule and What Counts

Quick answer: Medicare usually requires a face-to-face visit with your treating clinician between the 31st and 91st day after you start CPAP. The clinician must document that you are benefiting from therapy, and the machine data must show adherence. The common standard is at least four hours of use per night on at least 70% of nights during a 30-day period. Miss it, and Medicare may stop paying for the machine and supplies.

What the 90-day rule actually is

The “90-day rule” is shorthand for a coverage checkpoint. After you begin CPAP, Medicare allows a trial period. Around the third month, your clinician must see you and document that the therapy is helping. The supplier also needs objective usage data from the machine.

The visit is not a formality. It is the point where you can say the mask hurts, the pressure feels wrong, or you are still exhausted. Those problems are easier to fix before the coverage decision than after.

What counts as compliance

Medicare's common adherence standard is at least four hours per night on at least 70% of nights over a consecutive 30-day period. The machine records when it is running and delivering pressure. Naps count if the machine is on. Taking the mask off in your sleep does not.

Four hours is a billing threshold, not a treatment goal. Many people need seven or eight hours to feel the benefit. If you are barely hitting four, that is a sign to troubleshoot, not a victory.

How to check your data

Most machines have an app or a screen that shows usage hours. Your supplier can also download the data. Look at a 30-day view, not one night. If your average is close to the line, small changes can make the difference: going to bed earlier, fixing a leak, or treating nasal congestion.

Do not ask anyone to falsify usage data. It is fraud, and modern machines record objectively.

If you are struggling

Talk to your clinician or supplier before the visit. Common reasons for low use include:

• Mask leak or pain
• Claustrophobia or anxiety
• Dry mouth or nose
• A pressure setting that feels too high
• Insomnia or a work schedule that limits sleep time
• Depression or a stressful period

Each has a practical response. A different mask, humidity adjustment, EPR, CBT-I, or a conversation about shift work can help. The worst plan is to hide the problem and hope the numbers improve.

What happens if you do not meet the threshold

The supplier may stop billing Medicare, and you may have to return the machine or pay for it. You may be able to restart therapy with a new trial if your clinician documents a reason and you meet the criteria again. Rules vary, so ask the supplier and your plan.

If you have a legitimate reason for low use, such as a hospitalization, tell your clinician. Documentation may help, but it does not guarantee coverage.

After the trial

Once you own the machine or complete the rental period, Medicare continues to cover supplies if therapy remains medically necessary. Some plans periodically ask for updated documentation. Keep your appointments and answer supplier questions.

If you switch to a new machine, a new prescription and documentation may be required. Our guide to Medicare CPAP supplies explains replacement intervals. For therapy basics, read CPAP therapy: getting started.

A practical timeline

1. Day 1: Start CPAP and note any problems.
2. Week 1: Call the supplier if the mask leaks or hurts.
3. Week 2–4: Build a routine; check usage weekly.
4. Day 31–91: Attend the follow-up visit with your data.
5. After: Keep using therapy and replace supplies on schedule.

How the supplier gets your data

Most machines transmit usage data wirelessly or store it on an SD card. The supplier downloads it and sends it to Medicare. If your machine is not connected, you may need to bring the card to the supplier. Ask how they prefer to receive it and confirm that the data was received before your follow-up visit.

Travel and compliance

Using CPAP on vacation still counts. If you leave the machine at home, those nights are missing. A travel device or battery can help, but the data must still be recorded. If you are going away for an extended period, tell your supplier so they can plan shipments and data collection.

Changing suppliers

If you switch suppliers during the rental period, confirm that the new supplier has your documentation and that Medicare claims do not overlap. Ask both suppliers for the transfer date in writing. A gap in billing can interrupt supplies.

Frequently Asked Questions

What is the Medicare 90-day CPAP rule?

It is a follow-up requirement: a clinician visit roughly 31 to 91 days after starting CPAP, with documentation of benefit and objective adherence. The supplier uses the data to support continued coverage.

How many hours does Medicare require for CPAP?

The common standard is at least four hours per night on at least 70% of nights over a 30-day period. That is a coverage minimum, not a treatment target.

Do naps count toward CPAP compliance?

If the machine is running and delivering pressure, the time is recorded. Naps can count toward the usage total, but they do not replace a full night of therapy.

What if I miss a few nights?

A few missed nights may not sink a 30-day average, but a pattern can. Talk to your clinician about why you are missing nights and fix the cause before the follow-up.

Can I change my CPAP pressure to improve compliance?

Only with your clinician. The wrong pressure can cause leaks or leave apnea untreated. Comfort settings such as ramp or EPR may be adjusted with guidance.

Does Medicare check compliance forever?

The main checkpoint is early in therapy. Suppliers may still require documentation for replacement supplies, and some plans review adherence periodically.

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

• Medicare CPAP supplies and replacement
• CPAP therapy: getting started