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A Medicare prosthetic claim was denied. Here's what you do with the letter.

A denial is step one of a defined appeals process, not the final word. A walkthrough of how Medicare claims appeals actually work for prosthetics — who files, what documentation matters at each stage, and how to decide whether to lead or let your clinic's billing team.

A person sketching at a window at dusk with a prosthesis visible beneath the table
MRBy Mara Riggs

The letter arrives and reads like a judgment. It is technically a starting point.

Medicare’s appeals process for denied DMEPOS claims — prosthetics fall under this category — is a structured, multilevel procedure with defined deadlines and decision rules. It is slow. It requires paperwork. It is also the mechanism that exists, and for claims of any real value, it is worth using.

This guide walks through what the denial letter actually contains, who should be filing at each stage, what documentation tends to move the needle, and where the process typically resolves.

It does not cover every denial scenario, because there are more scenarios than a guide can hold. Where the situation is complicated, your O&P clinic’s billing coordinator is the more useful resource than any general reference.

Start with the denial notice itself

Before anything else, get the notice in your hands and read the denial reason.

Under traditional Medicare Part B, the denial shows up on your Medicare Summary Notice (MSN) — a quarterly paper summary of claims processed on your behalf. If the denial happens and you are waiting on a device, you may not see it until the next MSN cycle unless you check your account at mymedicare.gov. Your O&P clinic, if they filed the claim, should also receive a remittance advice notice from the MAC with the denial reason.

Under Medicare Advantage, the denial comes via your plan’s Explanation of Benefits (EOB) and may arrive faster, particularly if there was a prior authorization denial rather than a post-service claim denial.

What you are looking for in the notice:

  • The denial reason, often expressed as a code or brief description. Common ones for prosthetics include “medical necessity not established,” “documentation not on file,” or “level of function does not support coverage of item billed.”
  • The appeal rights section, which states your options and the deadline for the first level. This section is required by law.
  • The amount at issue — relevant because some appeal levels have minimum dollar thresholds.

Write the deadline down before you do anything else.

Who is actually filing this appeal

If your O&P clinic accepted assignment on the claim — which most enrolled Medicare suppliers do — they submitted the claim directly to Medicare and received the payment or denial directly. They have a financial stake in the outcome.

In that situation, the clinic’s billing team usually knows about the denial before you do. They may already be preparing a redetermination request. Before you start drafting letters, call the clinic and ask: Do you have the denial, and are you filing an appeal?

The clinic can file the redetermination and the QIC reconsideration on your behalf with your authorization. You can also file independently, or jointly. The supplier cannot hold the denied amount against you as a patient balance for a covered service unless specific conditions apply — see the ABN section below.

If you are on Medicare Advantage, the process runs through your plan rather than the MAC, and the clinic’s billing team knows that system. Coordination matters more here, not less.

If the clinic is not pursuing it — maybe the amount is small for them, maybe they have moved on — you can file independently. You are the beneficiary and you have standing at every level.

The Advance Beneficiary Notice question

If your O&P clinic believed before providing the item that Medicare was likely to deny it, they were supposed to give you an Advance Beneficiary Notice of Noncoverage (ABN) — a form that explains the reason Medicare might not pay and asks whether you want to receive the item anyway and accept financial responsibility.

If they gave you an ABN and you signed it, you may be responsible for the cost if Medicare denies and the appeal fails. If they did not give you an ABN for an item that requires one, and the claim is denied, you generally cannot be billed for that item. The clinic accepted the financial risk by failing to issue the notice.

Ask the clinic directly whether an ABN was issued. If it was, get a copy.

Level 1: Redetermination

What it is: A review of your claim by the same Medicare Administrative Contractor (MAC) that issued the denial. For most lower-limb prosthetic claims, the MAC is either Novitas Solutions or CGS Administrators, depending on your geographic region.

Deadline: You must file within 120 days of the date on the initial determination notice.

Who reviews it: Different staff at the same MAC. This is not an independent review. That matters for how you frame what you submit.

How to file: You can use CMS Form 20027, or submit a written request. It must include: your name and Medicare ID, the date of the initial determination, the item at issue, and the reason you disagree. You can submit additional documentation with the request — and this is where most of the practical work happens.

Timeline: The MAC has 60 days to issue a decision.

What to submit with it:

The redetermination is your first chance to correct the record. What moves it depends on why the claim was denied.

  • “Medical necessity not established” — This usually means the documentation submitted with the original claim didn’t satisfy the applicable LCD L33944 criteria. You want: the prescribing physician’s clinical order and supporting notes, the functional assessment from the treating therapist or physician, the prosthetist’s evaluation notes documenting your ambulatory ability and rehabilitation goals, and any relevant medical history (diagnosis, comorbidities, prior prosthetic history). The LCD specifies what medical necessity looks like for each K-level; your documentation needs to speak to those criteria specifically.

  • “Level of function does not support item billed” — This is a K-level dispute. Your K-level classification lives in the prescribing documentation. If that documentation was thin, incomplete, or produced before your rehabilitation was complete, a better-supported functional assessment is the thing to add. A physical therapist’s documented evaluation of your current gait, balance, and community ambulation can strengthen the record considerably. The K-levels guide walks through what each level requires.

  • “Documentation not on file” — The MAC didn’t receive what it needed. Work with your clinic’s billing team to identify exactly what was missing and submit it. This is often the simplest category to correct.

  • Coding issues — If the denial was triggered by a HCPCS coding problem, your clinic’s billing team should handle this; they know what code was submitted and what the correction is.

Level 2: Reconsideration by a Qualified Independent Contractor (QIC)

What it is: An independent review of your claim by a contractor that has no prior involvement in the denial. The QIC is required to review all evidence submitted, including what you add at this stage.

Deadline: 180 days from the date of the redetermination decision.

Why this matters: The QIC reconsideration is genuinely independent. The reviewer is a clinician — usually a physician — rather than a billing contractor, and they are tasked with applying the coverage criteria to the record without deference to the MAC’s prior determination. In practice, the QIC stage is where more complex medical necessity disputes have the best chance of being decided on the clinical merits.

How to file: Written request to the QIC identified on your redetermination decision notice, or via the online portal if your MAC uses one. Submit all documentation you want considered — the QIC will review the complete record, including what you submitted at Level 1, but you can add more.

Timeline: 60 days for the QIC decision.

What to add here, if you did not already:

If the redetermination went against you, examine what reason the MAC gave. The reconsideration is your opportunity to specifically address whatever the MAC said was missing or insufficient.

A treating physician’s letter that directly addresses the coverage criteria — not a generic letter of support, but one that responds to the specific denial reason — carries weight at this stage. If the dispute is about K-level, a reassessment by a physical therapist or the prescribing physician that documents your current functional status in the language of the LCD may be the most useful thing to add.

Level 3: Administrative Law Judge (ALJ) Hearing

What it is: A hearing before an ALJ at the Office of Medicare Hearings and Appeals (OMHA). This is the first fully independent stage — the ALJ is not affiliated with CMS or the contractor that reviewed your claim previously.

Deadline: 60 days from the date of the QIC decision.

Threshold: This level has a minimum amount-in-controversy requirement. CMS adjusts this annually; for recent years it has run in the range of $180–$200. For most prosthetic claims, the denied amount will exceed this threshold.

How it works: You request a hearing, submit evidence, and can appear in person, by phone, or by video. The ALJ can affirm, reverse, or remand the prior decision.

Practically: Most prosthetic claim disputes resolve before reaching the ALJ stage — either at redetermination or reconsideration. If you reach Level 3, you may want to consult a Medicare patient advocate or an attorney familiar with DMEPOS appeals. Some non-profit organizations and disability law centers offer this kind of support.

Levels 4 and 5: Medicare Appeals Council and Federal Court

These exist and are available if earlier levels go against you. Level 4 is a review by the Departmental Appeals Board’s Medicare Appeals Council; Level 5 is federal district court, with a higher amount threshold. For most prosthetic disputes, reaching these levels means a protracted fight over a single claim. If you are at Level 3 and considering whether to continue, the complexity and timeline involved are worth factoring.

The parts that are in your control

Deadlines are not flexible. Missing the filing window at any level typically ends that stage of the appeal. The deadline runs from the date on the decision notice, not the date you received it. Mail takes time; file early.

Documentation is almost always the issue. Prosthetic denials are rarely about coverage eligibility in the abstract — Medicare covers prostheses for beneficiaries who meet the clinical criteria. They are almost always about whether the record establishes that you meet those criteria. Building the documentation case is the substantive work of any appeal.

Your O&P clinic’s billing coordinator is a resource. They know your specific claim, the denial code, and the appeals path for your contractor. They have done this before. In many cases, they are already pursuing the appeal. The most useful thing you can do early is make sure you and the clinic are aligned on who is doing what and by when.

Keep copies of everything. Every submission, every decision notice, every piece of correspondence. Appeals can span months; the paper trail matters.

If the appeal involves a K-level reassessment, ask your prescribing practitioner directly. A functional classification is grounded in clinical documentation, and updated documentation can change the record. The K-levels guide covers what each level requires and how a reassessment works.

Medicare Advantage: the same process, different rules

If you are on a Medicare Advantage plan, the appeals process runs through your plan rather than the MAC system. Plans must comply with CMS appeals requirements, but the specifics — forms, addresses, internal review levels — vary by plan. Your denial notice and your plan’s Evidence of Coverage document will identify the appeals path. The general principle is the same: defined stages, defined deadlines, documented evidence.

One additional note for Medicare Advantage: prior authorization denials are a distinct category from post-service claim denials, and some plans have internal expedited appeal processes for situations where a delay would cause serious harm. If you were denied authorization before receiving a device and the situation is clinically urgent, ask the plan specifically about expedited appeal procedures.

Amputee News does not provide individualized medical, legal, benefits, or insurance advice. Medicare coverage and appeals rules depend on your specific plan, applicable policies, and the facts of your claim. This guide reflects general information about the Medicare fee-for-service appeals process and is not a substitute for professional guidance on your situation. CMS’s Medicare Appeals page is the authoritative source for current forms, deadlines, and procedures.