Do Commercial Payers Check CPAP Adherence After Day 90?

Updated October 2026. Written by Matteo Grassi, cofounder of HANA Health, trained in psychology.

Commercial CPAP adherence rules are payer specific conditions that tie continued coverage to device usage data, and some keep checking well past day 90. As of October 2026, Carelon's sleep guideline asks for proof of use every 90 days in year one and annually after that. Medicare, by contrast, checks once, inside the first three months.

From the clinical side, a usage download tells you that a patient stopped. It never tells you why.

Key facts

• Medicare's adherence test is 4 or more hours a night on 70% of nights in one consecutive 30 day window during the first 3 months, per LCD L33718.
• Carelon's 2026 sleep guideline requires a compliance check every 90 days for the first year of therapy and annually after that, per its Sleep Disorder Management guideline effective 19 September 2026.
• Carelon accepts a treating provider's attestation of clinical benefit as an alternative to meeting the usage threshold, and that provider can't be the DME supplier.
• Cigna's commercial program has been administered by eviCore since 1 February 2021, and eviCore supports patients through the first 90 days of therapy, per Cigna's provider resources.
• Only 48% of 213,341 commercially insured patients met the CMS standard in all four quarters of year one, per Alpert et al., Chest, 2024.
• The American Thoracic Society reported in 2023 that most large commercial carriers adopted the 4 hour rule after 2008, and that the cutoff came from expert opinion in a 1993 paper, per its policy statement.

What does Medicare check, and when does it stop checking?

Medicare checks adherence once. To keep covering a PAP device past the first three months, the treating practitioner must complete an in person re-evaluation between day 31 and day 91 and review objective usage data. Usage has to hit 4 hours a night on 70% of nights during one consecutive 30 day period within those first three months.

After that, there's no recurring usage test. Medicare does keep its rental schedule and its supply rules, but the adherence gate itself is a one time event.

That's the baseline most DME teams know. It's also the baseline that tempts people to assume every payer works the same way. They don't.

If you want the full Medicare walkthrough, we cover it in Medicare CPAP compliance requirements and the visit itself in the face to face reevaluation guide.

How does Carelon check CPAP adherence after day 90?

Carelon asks for repeated proof. Its guideline says ongoing treatment with CPAP or APAP is medically necessary for patients who demonstrate compliance, and that demonstration is required every 90 days for the first year of therapy and annually thereafter.

Compliance means either of two things:

• Usage: the device was used at least 4 hours a night on 70% of nights during a consecutive 30 day period within the preceding 90 days.
• Attestation: the treating provider, distinct from the DME provider, attests that the patient is getting clinical benefit at current usage levels.

Two details matter in practice. First, the usage window is a rolling lookback of 90 days, so a patient with one good 30 day stretch inside the last 90 days can still pass. Second, the attestation route needs a clinician who is willing to document benefit, which means someone has to ask them.

Carelon also notes that approval and implementation dates vary by health plan. Which of your patients fall under this guideline depends on the plan, so check each plan's own notice.

What does Cigna require for CPAP adherence?

Cigna's commercial program is managed by eviCore, and PAP devices go through registration with eviCore. Cigna's provider page says eviCore uses device usage data to support the patient during the first 90 days of therapy by reaching out to the DME provider or referring provider. It doesn't contact patients directly about usage.

Here's the honest limit. We didn't find a current public Cigna rule that sets a recurring adherence check after day 90, and Cigna's own page describes support during the first 90 days only. Plans also differ by benefit design, and coverage of PAP varies across employer plans. If a Cigna patient's supplies or rental are denied after day 90, ask eviCore for the specific policy and date that applies.

Why do commercial rules vary so much?

Commercial rules vary because no federal rule sets them. Each plan, and often each delegated benefit manager, writes its own medical policy and decides how often to look at usage data.

The ATS policy statement explains how we got here. The 4 hours on 70% of nights threshold traces to a 1993 study by Kribbs and colleagues, where the cutoff was set by expert opinion and only 46% of patients in that early sample met it. Medicare adopted it in 2008, and the ATS says most commercial carriers followed.

The ATS has argued for changing the standard. It recommends defining adherence by sustained patient benefit and suggests a minimum of 2 hours a night averaged after a 6 month trial. That's a recommendation from a professional society, not current payer policy.

So you're managing one clinical definition of adherence, enforced on different calendars. Medicare's calendar ends at day 91. Carelon's runs for the first year and then yearly. Others sit somewhere in between.

How common is non adherence in commercially insured patients?

Non adherence is common, and it builds over the year. In a cohort of 213,341 commercially insured adults, researchers split year one into four 90 day quarters. 48% met the CMS standard in all four quarters, 30% met it in one to three quarters, and 22% met it in none. The study came from researchers at a PAP device maker, and it used cloud connected device data rather than claims.

The same paper found that claims based shortcuts for adherence performed poorly. Depending on the algorithm, between 10% and 84% of patients were labeled adherent. Consistent users were often flagged as non adherent, and inconsistent users were often flagged as adherent.

That second finding matters if your payer uses billing patterns to guess at usage. Device data is the cleaner record, and it's the one you should be looking at weekly.

Carelon's own guideline says compliance may be as low as 50% at one year, which lines up with the 48% figure.

How should a DME handle a year one adherence calendar?

A DME should run its own adherence calendar ahead of the payer's. Here's a simple schedule built around a payer that checks every 90 days in year one:

1. Day 2 to 7: confirm the device is transmitting data, the mask fits, and the patient knows who to call. Fix leaks early.
2. Day 30: pull the first usage report. Flag any patient under 4 hours on most nights while there's still time to change a mask or pressure setting.
3. Day 60: pull a second report and schedule the practitioner re-evaluation for the day 31 to 91 window.
4. Day 90: have the 30 day window, the usage report and the practitioner note on file together.
5. Day 180: check the rolling 90 day lookback. If a patient has slipped, reach out before the next review rather than after a denial.
6. Day 270 and day 360: repeat the lookback, and confirm which clinician can attest to clinical benefit if the usage number falls short.
7. Year two onward: put the annual check on the calendar for every patient under a payer that reviews yearly.

The common failure isn't missing day 90. It's treating day 90 as the finish line, then finding at month 8 that nobody has looked at the data since.

What this means for your DME

Know which standard each payer applies, and write it down by plan. A Medicare patient and a patient under Carelon guidelines need different calendars even when they're using the same device.

Build a short list of treating providers who will attest to clinical benefit when usage is borderline. Ask early, because attestation can't come from your own staff under Carelon's wording.

Track the rolling 90 day lookback, not just the first 90 days. And price out what a slipping patient costs you before the denial arrives, since rental months and resupply both depend on continued coverage.

HANA builds autonomous adherence follow up for sleep teams, so outreach doesn't depend on someone remembering to pull a report. You can see how it works on the HANA Sleep page.

Frequently asked questions

Does Medicare check CPAP usage after the first three months?

No recurring usage test exists in the LCD. The adherence gate is the 4 hours on 70% of nights test inside the first three months, plus the day 31 to 91 re-evaluation. Supply and rental rules continue on their own schedule.

Can a patient fail a commercial adherence check and still keep coverage?

Sometimes. Carelon's guideline lets the treating provider attest that the patient is getting clinical benefit at current usage levels. That's a separate path from the usage threshold, and it needs the clinician's documentation.

Who can attest to clinical benefit under Carelon's guideline?

The guideline says the treating provider, as distinct from the DME provider. A supplier can prompt the request and supply the usage report, but the clinical statement has to come from the treating clinician.

How do I find a specific payer's CPAP adherence rule?

Start with the plan's medical policy or provider manual, then the benefit manager's guideline site if the plan uses one. Ask the plan which version applies to your patient's effective date, since approval and implementation dates can differ.

Why do some patients meet the standard in month three and miss it later?

Many things can change after the first few months, and usage data can't say which one did. In the 213,341 patient cohort, only 48% met the standard in all four quarters of year one, so a pass at day 90 doesn't predict a pass at day 360.

Sources

1. Centers for Medicare and Medicaid Services, Local Coverage Determination L33718, Positive Airway Pressure Devices for the Treatment of Obstructive Sleep Apnea.
2. Carelon Medical Benefits Management, Sleep Disorder Management Clinical Appropriateness Guidelines, effective 19 September 2026.
3. Cigna Healthcare for Health Care Professionals, Sleep management resources.
4. Alpert N, Cole KV, Dexter RB, Sterling KL, Wickwire EM, Performance of Claims Based Algorithms for Adherence to Positive Airway Pressure Therapy in Commercially Insured Patients With OSA, Chest, 2024.
5. May AM and colleagues, Moving toward Equitable Care for Sleep Apnea in the United States: Positive Airway Pressure Adherence Thresholds, an Official American Thoracic Society Policy Statement, American Journal of Respiratory and Critical Care Medicine, 2023.

This article is educational and isn't billing, coding, clinical or legal advice. Check current CMS guidance and your MAC before you bill. If you run a DME or sleep program and want to talk through adherence follow up, book a short call with Matteo.