Most insurance plans pay for CPAP supplies on the replacement schedule Medicare sets: a new mask every three months, new cushions or nasal pillows twice a month, new tubing every three months, and new disposable filters twice a month. Private insurers usually mirror those intervals, though a few run tighter or looser. How often your insurance pays for CPAP supplies also depends on proving you use the machine, because nearly every plan requires data showing at least four hours of use per night on 70% of nights in a 30-day window before it will keep covering replacements.
The Standard Replacement Schedule
Each component has its own interval, driven by how fast it wears out. Cushions and nasal pillows go first because they press against your face for hours; tubing and frames last longer but still need swaps to prevent leaks and keep things hygienic. The Medicare-based schedule most insurers follow looks like this:
- Full-face or nasal mask: one every three months
- Mask cushions or nasal pillows: two per month
- Headgear: one every six months
- Chinstrap: one every six months
- Tubing: one every three months
- Disposable filters: two per month
- Non-disposable filters: one every six months
- Humidifier water chamber: one every six months
These are ceilings, not guarantees. Your insurer will not pay for a replacement mask at two months because it feels worn out. The clock resets from the date of your last covered supply, and ordering earlier generally means paying out of pocket. Some DME suppliers run automatic shipments timed to your eligible dates, which keeps you on schedule without tracking each item yourself.
Private plans sometimes depart from the Medicare schedule. A few allow mask replacements only every six months; others are slightly more generous with filters. Check your plan’s DME benefit summary before assuming the standard intervals apply.
The Usage Rule That Keeps Supplies Covered
Owning the machine is not enough. You have to prove you are using it, and the threshold is specific: at least four hours per night on at least 70% of nights during a consecutive 30-day period.1SUNY Upstate Medical University. Compliance and Adherence That works out to about 21 of every 30 nights, and falling even a minute short of four hours on a given night counts as non-use.
The first 90 days of therapy are the highest-stakes window. Medicare treats this period as a trial, and if you do not hit the usage threshold within those 90 days, Medicare can discontinue coverage for the CPAP device and all related supplies.2Centers for Medicare & Medicaid Services. NCD – Continuous Positive Airway Pressure CPAP Therapy for Obstructive Sleep Apnea OSA Restarting means a new physician evaluation and possibly a new sleep study. Most private insurers impose a similar trial window.
Modern machines record this automatically — usage hours, mask leak rates, residual apnea events — and insurers or DME suppliers pull the data remotely through built-in wireless modems. Your doctor still has to review the data and document that therapy is working. A physician’s word alone is not enough for Medicare; the compliance data from the machine has to back it up.3American Association of Sleep Technologists. Heres Why CPAP Adherence is So Critical
Documentation Behind Every Shipment
Coverage starts with a confirmed diagnosis of obstructive sleep apnea from a sleep study, either in-lab polysomnography or an approved home test. Medicare covers both.4Centers for Medicare & Medicaid Services. NCA – Sleep Testing for Obstructive Sleep Apnea OSA – Decision Memo
The results must show an apnea-hypopnea index of at least 15 events per hour, or at least 5 if you also have a related condition such as excessive daytime sleepiness, high blood pressure, or heart disease.4Centers for Medicare & Medicaid Services. NCA – Sleep Testing for Obstructive Sleep Apnea OSA – Decision Memo A physician then writes a prescription specifying the device type and pressure settings.
Within the first 90 days, you need a follow-up with your prescribing doctor. The physician must document that you are using the device as directed and that therapy is providing clinical benefit.5Medicare.gov. Continuous Positive Airway Pressure CPAP Therapy That visit, combined with your machine’s compliance data, is what triggers continued coverage of supplies beyond the trial period.
After that, ongoing requirements vary. Some insurers want annual re-evaluations; others only ask for updated records if there is a usage gap or an equipment change. Switching carriers usually means producing a new prescription and recent compliance data. A significant health change, like major weight loss or a new cardiac diagnosis, can also prompt a reassessment.
What You Pay for Supplies
The replacement schedule tells you how often supplies ship. What you owe each time depends on your coverage.
Medicare Part B
Medicare classifies CPAP equipment as durable medical equipment under Part B. After you meet the annual Part B deductible of $283 in 2026, Medicare covers 80% of the approved amount for the machine rental and all related supplies, and you pay the remaining 20%.6Medicare.gov. Medicare Costs7Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles Your supplier must accept Medicare assignment for those rates to apply. If they do not, you could owe more.
Private Insurance
Private plans generally cover CPAP under their DME benefit, but cost-sharing varies widely. You may need to meet a separate DME deductible first, and coinsurance typically runs 20% to 50%. PPO plans give you more supplier flexibility but may charge higher coinsurance out-of-network. HMO plans tend to have stricter networks and cover a larger share when you stay in them. High-deductible plans leave you paying the full cost of supplies until the deductible clears.
Medicaid
Medicaid covers CPAP machines and supplies in all states, but scope, quantity limits, and documentation requirements vary by state. Some states require prior authorization before any CPAP equipment is dispensed, and many require periodic re-evaluations of medical necessity. Contact your state Medicaid office or managed care plan for the replacement schedule and approval process that applies to you.
HSA and FSA Funds
CPAP machines and supplies qualify as medical expenses under IRS rules, so you can pay with Health Savings Account or Flexible Spending Account funds.8Internal Revenue Service. Publication 502, Medical and Dental Expenses That is useful for covering coinsurance, deductibles, or supplies your insurer will not cover between eligible dates. Keep receipts, since administrators may ask for documentation showing medical necessity.
Where You Buy Changes What You Get Back
Most insurers contract with specific DME suppliers at negotiated rates. Buying from an out-of-network supplier often means reduced reimbursement or none at all. Some plans run closed networks limited to one or two suppliers; others offer a broader list.
Many DME suppliers use a subscription model: once your insurance is on file, they contact you when the next replacement is eligible and ship it automatically. Convenient, but worth price-checking. Some online retailers sell supplies for significantly less than a DME supplier charges, with the trade-off that you file your own claim and may get back less than you paid.
Insurers may also require prior authorization for certain components, especially if you need a replacement sooner than the standard schedule allows. Getting authorization after you have already purchased almost never works, so call first if there is any question.
Reimbursement on out-of-network purchases often surprises people. Insurers pay based on their own allowed rate, not what you actually paid. If you buy a mask online for $120 and your insurer’s allowed amount is $80, your reimbursement is calculated from the $80 figure. At 80% coverage, that is $64 back on a $120 purchase. Checking your plan’s allowed amounts before buying out-of-network prevents that shortfall.
Claim processing delays usually come from incomplete documentation. The most common holdups are a missing prescription, expired compliance data, or an authorization that was never obtained. Keep copies of everything you submit, and follow up directly with your insurer if a claim has not been processed within 30 days.
If a Supply Claim Is Denied
Denials are not always the final word. Read the denial letter first — it states the specific reason, usually one of a handful: failure to meet compliance requirements, ordering before the eligible date, using an out-of-network supplier, or missing documentation. The reason dictates the next move.
For Medicare claims, the first level of appeal is a redetermination. You have 120 days from the date you receive the denial notice to file it.9Centers for Medicare & Medicaid Services. First Level of Appeal – Redetermination by a Medicare Contractor Submit a written request with supporting evidence: a letter from your doctor explaining medical necessity, updated compliance reports, or proof of authorization. If that is denied, you can escalate to a reconsideration by a Qualified Independent Contractor, then to an administrative law judge hearing, and beyond, each with its own filing deadline that generally runs 60 to 120 days from the prior decision.
Private insurers have their own appeal processes laid out in your plan documents, usually with filing windows of 60 to 180 days from the denial. Many states allow an external review by an independent third party once internal appeals are exhausted. Specificity wins appeals: attach the exact compliance data, the exact diagnosis codes, and a physician statement that directly addresses the insurer’s stated reason for denial.