Medicare Coverage for Sleep Studies and CPAP: The Compliance Check Most People Miss

Sleep apnea affects an estimated 22 million Americans and is substantially underdiagnosed. Medicare covers the diagnostic sleep study and the CPAP machine prescribed to treat obstructive sleep apnea, but with a specific compliance requirement in the first three months that can affect continued coverage. Many people get their CPAP, struggle to use it consistently in the early weeks, and then discover their Medicare coverage was discontinued because they did not meet the usage threshold. Understanding that requirement before you start CPAP therapy can help you stay on track.

Bryce's Take

The compliance check is the piece most people do not know about until they fail it. Medicare pays for the CPAP rental, but at 90 days they verify you have been using it, four hours a night for 70% of nights. If you have not met that threshold, coverage can be discontinued. Use the machine. If it is uncomfortable, call your sleep physician immediately for mask fitting adjustments or pressure changes. Losing coverage because of early comfort issues is entirely preventable.

Sleep study coverage under Part B

Medicare Part B covers sleep studies used to diagnose sleep disorders when ordered by a physician. A polysomnography performed in a sleep lab is fully covered with standard Part B cost-sharing, the Part B deductible and 20% coinsurance apply. Medicare also covers home sleep testing as an alternative diagnostic method for patients without significant comorbidities. Home sleep tests are less expensive than in-lab studies and can be performed in your own bed. Your physician determines which type of study is clinically appropriate for your situation.

CPAP coverage under Part B as DME

If your sleep study diagnoses obstructive sleep apnea with an apnea-hypopnea index above the qualifying threshold, Medicare Part B covers a CPAP machine as durable medical equipment. The CPAP must be prescribed by a physician and provided by a Medicare-enrolled DME supplier. Medicare pays for the CPAP on a rental basis initially. Standard Part B cost-sharing applies, 20% of the Medicare-approved rental amount after the annual deductible. With Medigap Plan G or N, the 20% coinsurance is covered.

The three-month compliance review

This is the part most new CPAP users do not expect. Between 31 and 91 days after you receive your CPAP, Medicare requires documentation of compliance with CPAP therapy. Compliance is defined as using the CPAP for at least four hours per night on at least 70% of nights during a consecutive 30-day period. CPAP machines track usage data through a built-in data chip. Your sleep medicine physician or DME supplier downloads this data to verify compliance. If you meet the threshold, Medicare coverage continues. If you do not meet it, Medicare stops paying for the CPAP rental and coverage can be discontinued.

What happens if you fail the compliance check

If your CPAP compliance falls below the required threshold in the initial monitoring period, your DME supplier will notify you that coverage is being discontinued. You can continue using the CPAP by paying out of pocket. To resume Medicare coverage, you must go through a new evaluation demonstrating need and potentially a new prescription. Some DME suppliers and sleep medicine practices work closely with patients to improve compliance before the check occurs. If you are struggling with CPAP use in the first months, mask discomfort, pressure problems, claustrophobia, contact your prescribing physician or DME supplier promptly for troubleshooting rather than simply not using it.

The 13-month rental to ownership transition

If you maintain compliance and continue CPAP use, Medicare pays rental fees for 13 months. After 13 consecutive months of rental payments, Medicare stops paying rent and you own the machine. Ongoing supplies, masks, tubing, filters, and cushions, continue to be covered under Medicare's scheduled replacement allowances after you own the machine. Maintaining compliance throughout the rental period is important because ownership only transfers after 13 months of continued coverage.

BiPAP and other PAP devices

BiPAP (bilevel positive airway pressure) machines are covered for patients whose obstructive sleep apnea is not adequately treated by standard CPAP or who have other breathing conditions requiring bilevel pressure. Coverage criteria are similar to CPAP but require documentation of CPAP failure or a specific clinical indication for bilevel therapy. BiPAP is also covered for central sleep apnea and other conditions under appropriate clinical criteria.

Bryce Casson

Licensed Independent Medicare Broker

Bryce Casson is an independent Medicare insurance broker who works with every major carrier. He does not represent any single insurer, which means his recommendations are based on what actually fits each client's situation, not on commissions or quotas.