Sleep Studies, CPAP, and the 90-Day Rule That Takes Machines Away

Sleep apnea sits at the intersection of three corpus themes: the scary portal result (a spouse's recording, an oximeter reading), the equipment coverage maze, and a rule almost nobody learns until it bites: insurance watches whether you actually use the machine, and takes it back if you don't. The rule is beatable by knowing it exists, and the whole pathway (test, machine, supplies, alternatives) is more covered than people assume. Here's the map.

Getting tested: cheaper and easier than its reputation

The pathway starts with symptoms (snoring with pauses, gasping awakenings, unrefreshing sleep, morning headaches, dozing through afternoons) reported to your PCP, who refers for testing. Medicare covers sleep studies when a doctor orders them for suspected OSA, and for straightforward cases the first-line test is now a home sleep apnea test: a mailed or picked-up sensor kit worn for a night or two, at a fraction of a lab study's cost. In-lab polysomnography remains the tool for complicated pictures (suspected central apnea, other sleep disorders, inconclusive home tests). Commercial plans mirror this and often *require* the home test first. Two practical notes: the visit-notes decoder applies to sleep reports too (AHI, the apnea-hypopnea index, is the headline number: 5 to 15 mild, 15 to 30 moderate, 30+ severe), and if the referral stalls in a months-long queue, the queue playbook applies.

The machine: a rental you earn

• The structure: Medicare rents the CPAP through a DME supplier for 13 months at 20% coinsurance (after the deductible), then ownership transfers to you. Commercial plans run similar rental-to-own or purchase arrangements.
• The 90-day trial, precisely: coverage continues past the trial only if you use the machine at least 4 hours per night on 70% of nights during a consecutive 30-day period within the first 90 days, AND you have a follow-up visit between day 31 and 91 where the doctor documents that it's helping. The machine's cellular modem reports your hours automatically; this is the rare coverage rule enforced by telemetry.
• If you fail the trial: coverage stops, and restarting requires a new face-to-face evaluation and usually a repeat sleep study. Expensive in time and money, and almost always avoidable, per the next section.
• Supplies run on a schedule: masks roughly every 3 months, cushions monthly, tubing quarterly, filters every couple of weeks (schedules vary slightly by payer). Replacements matter clinically (seals degrade, therapy quality drops), and suppliers ship on the schedule if you confirm; audit the EOBs since supply billing errors are routine.

When CPAP genuinely isn't it: the covered alternatives

1. Oral appliance therapy: a custom mandibular advancement device from a dental-sleep specialist, effective for mild-to-moderate OSA and covered by Medicare and many plans when CPAP fails or is refused. The network dance applies since dental-sleep providers are sparse.
2. Weight-loss medication for OSA with obesity: Zepbound carries an FDA indication for moderate-to-severe OSA in adults with obesity, which changes its coverage math and gives the sleep-apnea diagnosis a second job.
3. Positional therapy and surgery consults: for positional OSA and anatomy-driven cases; and hypoglossal nerve stimulation (Inspire) for moderate-to-severe OSA in patients who failed CPAP, covered by Medicare and most plans with prior authorization and specific eligibility (AHI range, BMI limits, a drug-induced sleep endoscopy).
4. Whatever the path, close the loop on the diagnosis: untreated OSA compounds blood pressure, heart, and glucose problems, so "I quit the mask" should always be followed by "and switched to X," never by nothing.