You finally got the equipment your doctor ordered. Then a letter arrives: claim denied.

It happens more often than Medicare would like to admit — and here's the part they don't advertise: roughly half of all first-level DME appeals result in a reversal. Half. According to CMS data, approximately 52% of redeterminations result in a change to the original decision. That means the denial wasn't the final word. It was a starting point.

This guide walks you through all five levels of the Medicare DME appeal process — deadlines, exact steps, what to include, and what to do when they say no again.

Why Medicare Denies DME Claims

Before you file anything, find out why they denied it. Every denial has a reason code on your Medicare Summary Notice (MSN) or Explanation of Benefits (EOB). The most common reasons for DME denials:

• Missing Certificate of Medical Necessity (CMN) — Your doctor or supplier didn't submit the required documentation for your equipment category. A CPAP, for example, requires Form CMS-484 plus sleep study results showing an AHI of 15+ (or 5+ with documented symptoms).
• LCD criteria not met — Medicare's Local Coverage Determinations set clinical rules for each equipment type. If your diagnosis codes don't align with the LCD, they'll deny it regardless of what your doctor wrote.
• No written order on file — Medicare requires a written, dated prescription from a treating physician before the equipment was delivered. Verbal orders don't count.
• Supplier enrollment issues — The supplier isn't properly enrolled in Medicare, or delivered the equipment before getting required prior authorization.
• Frequency limits exceeded — You received replacement items before Medicare's coverage interval elapsed. CPAP supplies, for instance, have strict replacement schedules.

This matters because if it's a documentation issue, your supplier may be able to resubmit a corrected claim without a formal appeal at all. Call their billing department first. If the problem is a clinical coverage dispute — that's when you appeal.

The 5 Levels of Medicare DME Appeal

Original Medicare gives you five bites at the apple. Each level has a hard deadline. Miss it, and you lose that round.

Level 1: Redetermination — File This First

Who decides: The same Medicare Administrative Contractor (MAC) that issued the denial — but different staff, not involved in the original decision.

Deadline: 120 days from the date you received your MSN. Medicare assumes you received it 5 days after the date printed on the notice, so your window is essentially 125 days from the date on the letter. Don't cut it close.

How to file:

1. Write a letter or complete Form CMS-20027 (Medicare Redetermination Request Form — download free at cms.gov). The form isn't required, but it ensures you don't miss anything.
2. Include: your Medicare ID number, the claim number, date of service, item or service denied, and a clear explanation of why the denial was wrong.
3. Attach supporting documentation: the physician's written order, CMN, clinical notes, diagnosis codes, and the specific LCD coverage criteria your situation satisfies.
4. Mail or fax to the MAC address printed on your MSN or Remittance Advice.

The MAC has 60 days to respond in writing. Success rate: ~52%. Put your best documentation in here — don't hold anything back for later levels.

Level 2: Reconsideration by the QIC

Who decides: An independent Qualified Independent Contractor (QIC). For Part B DME — oxygen, CPAP, wheelchairs, hospital beds — the QIC is Maximus Federal Services, which handles DME reconsiderations for all 50 states.

Deadline: 60 days from the date on your Level 1 denial letter.

How to file: Follow the instructions in your Level 1 denial letter exactly. Submit to Maximus at the address they provide. Include:

• A copy of your Level 1 denial letter
• Everything from your Level 1 appeal, plus any new documentation
• A written statement from your physician explaining medical necessity — a separate letter from the treating doctor carries more weight than chart notes alone

Maximus has 60 days to decide.

Level 3: ALJ Hearing at OMHA

Who decides: An independent Administrative Law Judge through the Office of Medicare Hearings and Appeals (OMHA).

Deadline: 60 days from your Level 2 decision.

Minimum amount in dispute: $200 in 2026. Most DME claims clear this threshold easily. You can also combine multiple denied claims to meet the minimum.

Hearings are typically conducted by phone or video conference. You can appear yourself, bring a representative, or submit written testimony. This is where a Medicare patient advocate or benefits counselor earns their keep. Your State Health Insurance Assistance Program (SHIP) provides free help — find yours at shiphelp.org.

Fair warning: OMHA has a substantial backlog. Expect 6–18 months for a decision at this level.

Level 4: Medicare Appeals Council

Who decides: The Departmental Appeals Board (DAB) at the U.S. Department of Health and Human Services.

Deadline: 60 days from the ALJ decision. No minimum dollar amount at this level.

You submit a written request. The Council can uphold, reverse, modify, or remand the ALJ's decision. Response times vary.

Level 5: Federal District Court

Deadline: 60 days from the Appeals Council decision.

Minimum amount in dispute: $1,960 in 2026. Individual claims often don't reach this threshold, but you can combine claims.

At this point, you need legal representation. Federal court Medicare appeals are rare — but they set precedent that benefits other beneficiaries. If you've reached this level over a significant claim, an attorney who specializes in Medicare law is worth consulting.

What to Include in Every Appeal Letter

Regardless of level, a strong appeal letter covers four things:

1. Why the denial reason is wrong. Reference the specific LCD criteria your condition meets. Quote the language directly. Vague disagreement loses; specific counterargument wins.
2. Medical necessity documentation. Clinical notes showing the diagnosis, the symptoms, what conservative treatments were tried and failed, and why this specific equipment is the appropriate medical solution.
3. Your physician's explicit support. A dedicated letter from your treating doctor — not just chart notes — explaining why they ordered this equipment. Ask for one specifically.
4. The complete timeline. When the equipment was ordered, when it was delivered, when you received the denial, when you're filing. Gaps in the timeline can be used against you.

When the Denial Is Your Supplier's Fault

Sometimes the denial isn't your mistake — it's your supplier's. Wrong billing codes, missing documentation, not obtaining prior authorization. In this case:

• Contact the supplier's billing department immediately and ask what went wrong
• Ask them to resubmit a corrected claim — this can resolve the issue without a formal appeal
• Get their response and any commitment in writing
• File your appeal anyway within your deadline window. You can withdraw it later if the resubmission succeeds — but you cannot un-miss a deadline

A good supplier advocates for you through this process. They know Medicare documentation requirements cold and handle appeals as part of their service. If yours won't engage, search the DMEHelper directory for Medicare-enrolled suppliers in your area — filter by equipment type to find providers who specialize in exactly what you need.

For specific equipment categories, our coverage guides can help you understand what Medicare requires before you go through this process again: see our guides on CPAP coverage, home oxygen therapy, hospital beds, and BiPAP machines.