CPAP Compliance Calculator
Track whether you're meeting the Medicare 70%/4-hour compliance requirement during your insurance compliance window.
This tool is for informational purposes only. Compliance requirements vary by insurer. Confirm your specific requirements with your insurance provider or equipment supplier.
Quick Compliance Check
What to Do Next
Medicare CPAP Compliance: The 4-Hour Rule→
Understand the full Medicare compliance rule and what happens if you don't meet it.
CPAP Consistency: Why 6 Hours Beats Skipping a Night→
You don't need perfect nights. Consistent use delivers the real benefits.
Already importing your SD card? Analyze Your Data →
Import your whole SD card folder for automatic compliance tracking and detailed therapy analysis.
This calculator is for informational purposes only. It does not guarantee insurance compliance. Verify your specific requirements with your insurance provider.
What This Tool Does
This calculator tracks your nightly CPAP usage against the Medicare compliance standard: at least 4 hours of use on at least 70% of nights in a consecutive 30-day period. Enter your hours for each night, and the calculator shows your current compliance rate, how many compliant nights you still need, and how many nights you can skip while still passing.
The Medicare 70%/4-Hour Rule
When Medicare covers a CPAP machine, it is initially provided as a rental. To continue coverage, the patient must demonstrate compliance during the first 90 days. The specific requirement, established by the Centers for Medicare and Medicaid Services (CMS), is that the CPAP must be used for a minimum of 4 hours per night on at least 70% of the nights in a consecutive 30-day period. In practice, this means 21 out of 30 nights must each show at least 4 hours of recorded usage.
The 30-day window does not have to begin on the first day you receive the machine. Any consecutive 30-day stretch within the first 90 days counts. This gives patients who struggle initially some room to adjust. Many DME providers will work with patients to identify the best 30-day window if the first few weeks are difficult.
Your CPAP machine records usage data automatically. ResMed machines store this data on the SD card and transmit it wirelessly to your provider via AirView. BMC and other manufacturers store data on the SD card. Your DME provider and sleep physician can pull these records to verify compliance. This calculator helps you track the same numbers yourself so there are no surprises.
How the Calculator Works
Enter your usage hours for each night of your 30-day compliance window. A night counts as compliant if you used your CPAP for 4 or more hours. The calculator tracks three numbers in real time: your current compliance percentage (compliant nights divided by tracked nights), the number of additional compliant nights you need to reach the 21-night threshold, and the number of remaining nights you could skip and still pass.
The status indicator shows four states. "On Track" means you are meeting the requirement with room to spare. "At Risk" means you can still pass but have very little margin for missed nights (one or fewer skippable nights remain). "Failing" means the current window can no longer mathematically reach 70%, and you should consider shifting to a different 30-day start date. "Passed" means all 30 nights are tracked and you met the threshold.
Tips for Meeting Compliance
The most common reason people fall short is not hitting the 4-hour minimum. If you fall asleep at 11 PM and your alarm goes off at 5 AM, you have a 6-hour window, but bathroom trips, mask removals, and time spent falling asleep can easily reduce your recorded usage below 4 hours. Putting the mask on 15 to 30 minutes before you plan to sleep gives you a buffer.
If you are having trouble tolerating the mask for 4 hours, talk to your provider about ramp settings (which start at a lower pressure and gradually increase), EPR or pressure relief (which reduces pressure on exhale), and heated humidification (which reduces dryness and congestion). A different mask type may also help. Use the Mask Finder Quiz to check whether a different style might suit you better.
Frequently Asked Questions
What is the Medicare CPAP compliance rule?
Medicare requires that CPAP users demonstrate they are using their machine for at least 4 hours per night on at least 70% of nights during a consecutive 30-day period within the first 90 days of receiving the device. This means at least 21 out of 30 nights must show 4 or more hours of usage. If you meet this threshold, Medicare continues to cover your CPAP rental and supplies. If you do not, coverage can be discontinued.
Does the 30-day compliance window have to start on day one?
No. The 30-day window can be any consecutive 30-day period within the first 90 days after you receive your CPAP machine. If your first few weeks are rough, you can still pass by finding a 30-day stretch later in the 90-day period where your usage was consistent. This calculator lets you model different start dates to find your best window.
What counts as a compliant night?
A compliant night is any night where your CPAP machine records 4 or more hours of usage. The machine measures usage from the time the mask detects airflow, not from when you turn the device on. Brief mask removals during the night (bathroom trips, for example) pause the usage timer. The total accumulated usage for the night must reach 4 hours to count.
What happens if I fail CPAP compliance?
If you do not meet the 70%/4-hour requirement within 90 days, Medicare may stop covering your CPAP rental. You would then need to either purchase the machine out of pocket or return it and restart the process with a new prescription and a new compliance period. Some private insurers have similar requirements but may use different thresholds or timeframes. Contact your insurance provider directly for their specific policy.
Do private insurance companies use the same compliance rule?
Many private insurers have adopted rules similar to Medicare's 70%/4-hour standard, but the specifics vary. Some require 4 hours on only 50% of nights, some allow a 60-day evaluation window instead of 30, and some have no compliance requirement at all beyond a prescription. Check your plan documents or call your insurer's durable medical equipment department to confirm your specific threshold.
Related Reading
- Medicare CPAP Compliance: The 4-Hour Rule : the full breakdown of what Medicare requires and why.
- How to Improve Your CPAP Compliance: 10 Practical Tips : actionable strategies for hitting the 4-hour mark.
- Does Insurance Cover a Sleep Study? Costs and Options : understanding insurance coverage for sleep apnea diagnosis.