The Waiver of Liability form for Medicare is a one-page statement a non-contracted provider signs before appealing a Medicare Advantage claim denial, promising not to bill the enrolled patient regardless of how the appeal turns out. Without it, the plan can dismiss the appeal without review. The form is short, the language is standardized, and the deadline is tight: it must reach the plan with the appeal request within 60 calendar days of the denial notice.
When You Need to Sign One
The Waiver of Liability (WOL) applies in one situation: a provider without a contract with the patient’s Medicare Advantage plan wants to appeal a denied claim for services already delivered. CMS guidance requires the non-contracted provider to sign the WOL confirming it will not bill the enrollee for those services, no matter what the appeal produces.1Centers for Medicare & Medicaid Services. Parts C and D Enrollee Grievances, Organization/Coverage Determinations, and Appeals Guidance
Contracted (in-network) providers don’t use the WOL. Their payment disputes go through the mechanisms already written into their plan contracts. The waiver exists precisely because a non-contracted provider has no such arrangement, and CMS won’t let a provider fight the plan for payment while leaving the patient exposed to a bill.
Submitting an appeal without the WOL doesn’t automatically end it. The plan must make reasonable efforts to obtain the missing form. But the adjudication clock doesn’t start until the signed WOL arrives, and if it never does, the appeal can be dismissed.1Centers for Medicare & Medicaid Services. Parts C and D Enrollee Grievances, Organization/Coverage Determinations, and Appeals Guidance
Where to Get the Form
CMS publishes a model Waiver of Liability Statement on its Medicare Managed Care Appeals and Grievances notices page, downloadable as a ZIP file.2Centers for Medicare & Medicaid Services. Notices and Forms Many Medicare Advantage plans post their own version through their provider portal. UnitedHealthcare, for example, hosts a plan-specific WOL for its network.3UnitedHealthcare Provider. Waiver of Liability Statement The legal language is the same either way: the provider waives collection rights against the enrollee for the denied services.
If the plan you’re dealing with offers its own template, use it. Plans process their own forms faster. If none is available, the CMS model works.
What Each Field Asks For
The WOL runs to six fields and a signature line. The CMS model and most plan versions follow the structure set out in Appendix 6 of the Medicare Managed Care Manual.4Centers for Medicare & Medicaid Services. Medicare Managed Care Manual Chapter 13 – Medicare Managed Care Beneficiary Grievances, Organization Determinations, and Appeals
- Enrollee’s name, entered exactly as it appears on the Medicare card so nothing fails to match.
- Medicare Beneficiary Identifier (MBI), the 11-character alphanumeric ID on the Medicare card. The MBI uses digits 1–9 and uppercase letters A–Z, excluding S, L, O, I, B, and Z. Some plan forms label this field “Enrollee ID Number” or “Member ID.”5Centers for Medicare & Medicaid Services. Understanding the Medicare Beneficiary Identifier Format
- Provider name, meaning the provider or facility that furnished the services and is filing the appeal.
- Dates of service, listing the specific dates the denied services were provided.
- Health plan, meaning the Medicare Advantage plan that issued the denial.
- Signature and date from an authorized representative of the provider. The signature is legally binding and forfeits any right to collect from the patient for those specific services.3UnitedHealthcare Provider. Waiver of Liability Statement
The waiver itself doesn’t ask for procedure codes, NPIs, or clinical documentation. Those belong in the broader appeal package that goes with it.
How to Submit It With the Appeal
The signed WOL has to be filed together with the appeal request and sent to the Medicare Advantage plan’s appeals department. The appeal must be filed within 60 calendar days of receiving the written denial notice. Receipt is presumed to occur five calendar days after the date printed on the notice unless the provider has evidence otherwise.6eCFR. 42 CFR Part 422 Subpart M – Grievances, Organization Determinations and Appeals
Put the WOL on top of the packet. Intake staff look for it first, and burying it behind clinical records tends to slow things down or generate a request for the “missing” form. Everything else — a cover letter identifying the claim, a copy of the denial notice or remittance advice, and clinical records supporting medical necessity — goes behind it. CMS guidance recommends including the remittance advice and relevant records alongside the signed waiver.1Centers for Medicare & Medicaid Services. Parts C and D Enrollee Grievances, Organization/Coverage Determinations, and Appeals Guidance
Delivery method matters because you may have to prove timely filing later. Certified mail with return receipt gives you a dated paper trail. Secure fax works if you keep the transmission confirmation. Some plans accept electronic submissions through their provider portal, which generates a confirmation number automatically. Retain your proof of submission indefinitely; later appeal levels can require you to show every earlier step went out on time.
Don’t Confuse the WOL With an ABN
The Advance Beneficiary Notice (ABN), Form CMS-R-131, is a different document for a different program. The ABN is used only under Original Medicare (fee-for-service), is given to the patient before the service, and shifts financial responsibility to the patient if the claim is denied.7Centers for Medicare & Medicaid Services. Advance Beneficiary Notice of Non-coverage Tutorial
The WOL runs the opposite way. It applies to Medicare Advantage (Part C), is signed after the claim has been denied, and shifts financial responsibility to the provider. An ABN has no place in a Medicare Advantage case, and a WOL has no place in an Original Medicare case. Filing the wrong one can invalidate the paperwork.
What Happens After the Plan Gets It
Once the plan receives the signed WOL, the adjudication clock starts. The plan has 60 calendar days to issue a decision on a standard post-service reconsideration.8eCFR. 42 CFR 422.590 – Timeframes and Responsibility for Reconsiderations If the plan overturns its denial, the provider gets paid. If the plan upholds the denial in whole or in part, it must prepare a written explanation and forward the case file to an Independent Review Entity contracted by CMS.
Because the provider signed the WOL, all correspondence from that point on goes to the provider rather than the patient. The enrollee has no remaining financial stake in the outcome. The original WOL carries through every subsequent level of appeal; there’s no need to sign a new one at each stage.
If You’re the Patient and Get Billed Anyway
You are protected the moment the provider signs the waiver. A bill from a non-contracted provider for services covered by a signed WOL violates the hold-harmless agreement, and you do not owe the money.
Start with your Medicare Advantage plan’s grievance and appeals department in writing. You have 60 days from the billing event to file a grievance, and the plan must investigate and respond within 30 days. Your State Health Insurance Assistance Program (SHIP) offers free counseling to Medicare beneficiaries if you want help preparing the grievance.
If the plan’s process doesn’t resolve it, call 1-800-MEDICARE (1-800-633-4227). Medicare uses its Complaint Tracking Module to handle reports of improper provider billing and can intervene with the plan on your behalf.