The 90-Day CPAP Cutoff May Be Too Soon to Measure Success

Early continuous positive airway pressure (CPAP) underuse doesn't always mean failure. In a large Kaiser cohort presented at ATS 2026, 21% of patients who missed the 90 day mark still averaged two or more hours nightly by one year, a level tied to real benefit. That's worth knowing, since the Centers for Medicare & Medicaid Services (CMS) coverage still hinges on a strict 90 day cutoff. 1. When Coverage Hinges on 90 Days CMS drops coverage if patients aren't adherent by day 90, and many private insurers follow suit, a rule that penalizes slow starters before they've had a chance to adjust. Kaiser Permanente Southern California takes a different approach: it doesn't restrict access based on early adherence. 2. What the Kaiser Data Show Researchers followed 132,492 adults who were issued CPAP devices between 2015 and 2023. Among those who missed the 90 day mark, 21% went on to average two or more hours nightly by one year, and 14% reached four or more hours. Those numbers represent meaningful use by any measure, undercutting the assumption that early struggle predicts long term abandonment. 3. Rethinking Success Metrics The standard bar, four hours a night on 70% of nights, doesn't capture the whole picture. In this cohort, 49% met that early benchmark, rising to 54% among adults 65 and older. ATS guidance already recognizes that two or more hours nightly can confer benefit, which supports staying engaged with patients who fall short of the stricter cutoff. 4. An Equity Check Early nonadherence clustered in younger patients, women, non-White groups, those with lower socioeconomic status, and those with milder apnea. White patients had higher adherence in the first 90 days, pointing to a disparity that starts early and compounds over time. A more patient centered policy could close some of that gap and improve long term access. 5. Give Patients Time to Adapt Ninety days is a tight window in practice. Titration and mask fit often take several visits to dial in. Falling short of four hours early on isn't a verdict, it's a reason to keep adjusting. For patients who genuinely never engage over the long term, reallocating the device makes sense. But as a blanket rule, 90 days and four hours remains an arbitrary line that leaves too little room for individual trajectories. BOTTOM LINE A rough start with CPAP isn't a reason to give up. Many patients who miss the 90 day target go on to reach clinically meaningful use a year later, reason enough to keep supporting them. Coverage rules remain rigid and largely arbitrary, so advocate for flexibility while reserving reallocation for patients with genuine, sustained nonuse. This article is based on a recent Medscape article titled " CMS CPAP Rule Could Deny Coverage for Some Who Benefit Long Term" and was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.