Last verified 2026-08-16

Your sleep apnea claim was denied. Here’s how to appeal it.

Start with the denial notice. Find the appeal deadline before you call anyone or start gathering records. Under federal rules covering ACA-compliant and most employer plans, you generally have 180 days from the denial notice to file an internal appeal. The date printed in your own notice controls.

Then find the exact reason for the denial. A sleep apnea claim can fail because a document is missing, a code was wrong, prior authorization was never obtained, or the plan says the service does not meet its policy. Your appeal needs to answer the reason the insurer actually gave you.

Start with the exact denial reason

Do not write a general letter saying the treatment is important. Read the denial language and identify which requirement the insurer says was not met.

Not medically necessary. The insurer is saying the records it received do not establish the plan’s medical-necessity criteria. In a sleep apnea claim, that often comes down to the sleep-study result, symptom documentation, diagnosis code, or another required record not being submitted in the form the policy expects. It does not necessarily mean a reviewer decided your treatment is clinically unreasonable.

Prior authorization not obtained. The plan required approval before the service and did not have that approval on file. These denials are frequently appealable and are often caused by an error at the practice or supplier rather than by you, but the missing authorization still has to be addressed.

Not a covered benefit. The plan says the benefit category itself is excluded. This is harder to overturn. Before you accept that answer, make sure the claim went to the correct benefit. An oral appliance submitted as dental care can be denied even when your medical plan would have considered the device under durable medical equipment.

Documentation insufficient. The insurer says a specific record or piece of information is missing. These denials are often the most straightforward to appeal because you can supply the missing item.

Compliance-based denial. PAP coverage can stop when your recorded use does not meet the plan’s adherence rule. Proving the original sleep apnea diagnosis again usually does not solve that problem; the compliance section below covers the different path back.

You are entitled to the plan documents and the specific criteria used to make the decision. Ask the insurer for them in writing. You want to appeal the rule it actually applied, not guess at what a reviewer might have wanted.

The internal appeal

You file the internal appeal with your insurer. Someone other than the original decision-maker must review it.

The filing deadline is generally 180 days from the denial notice, but use the exact deadline in your letter.

For the insurer’s response, the usual federal timeframes are about 30 days for a service you have not received yet, 60 days for a claim that has already been incurred, and about 72 hours for an urgent situation.

A useful appeal packet includes:

• your name, member ID, claim number, and denial date;
• the denial reason quoted exactly;
• a point-by-point response tied to supporting documents;
• a letter of medical necessity from your treating clinician;
• your sleep study, chart notes, prescription or order, and other records that support the request; and
• the plan’s own coverage criteria, when available, with the requirements you meet identified.

Keep the appeal factual. If the insurer says your sleep study was missing, include it and point to the result it needs. If it says PAP intolerance was not documented, include the chart note that documents what happened. The reviewer should not have to infer which page answers the denial.

Ask your treating clinician whether the insurer offers a peer-to-peer review. Many plans allow the prescribing clinician to speak directly with the insurer’s medical director. That conversation can sometimes resolve the problem without completing the full written appeal process.

External review

If the internal appeal fails, you may be able to ask an independent third party to review the case. If the external reviewer reverses the denial, the decision binds the insurer.

The deadline to request external review is generally 4 months from the final internal denial.

A standard external review is generally completed within 45 days. An expedited review can be completed in as little as 72 hours. The cost is usually nothing or a nominal fee, depending on your state.

Your final internal denial or explanation of benefits should tell you which organization handles the external review and how to request it. In urgent situations, you may be able to request external review without finishing the full internal process first.

Outcomes vary by state and by denial type. Massachusetts, for example, reports that more than 40% of external-review decisions are resolved in the patient’s favor.

A PAP compliance denial follows a different path

If your PAP coverage stopped because the machine did not show enough use, sending more proof that you have sleep apnea usually does not answer the denial. The insurer is looking at adherence, not whether the original diagnosis was valid.

Medicare’s standard is at least 4 hours a night on 70% of nights during one consecutive 30-day period within the first 3 months. That is 21 nights out of 30. Most commercial plans mirror it.

This is usually a pause rather than a permanent refusal of PAP coverage. The usual route back is to figure out why you were not using the machine, fix the problem, and re-attempt therapy. A mask that leaks, pressure intolerance, dryness, and other equipment problems can often be addressed without abandoning PAP entirely.

→ Why your mask leaks, and what to change → Medicare’s compliance rule, explained

Two additional steps

You can file a complaint with your state insurance commissioner while the appeal is moving. It costs nothing, creates a separate regulatory record of the dispute, and sometimes moves a problem that the appeal alone does not.

Also make sure a failed treatment is documented even if you decide not to continue it. If PAP genuinely cannot be tolerated, a clinical note explaining what happened can become part of the coverage case for an oral appliance or surgical option later. Many plans require documented PAP intolerance before they approve an alternative.

Keep copies of what you send, the date you sent it, and any confirmation number. If the appeal becomes a question of whether a document was received on time, your own record may be the easiest way to prove it.

The deadlines and procedures described here are general federal standards for ACA-compliant and most employer plans. Some states allow more time, and Medicare Advantage uses a different process. The deadline printed on your own denial notice controls. This is not legal advice.