You got a medical bill your insurance won't pay. Infuriating, right? But you don't have to pay it without a fight. You have the right to dispute the charge, and doing it right can save you hundreds or even thousands. It takes a clear understanding of your Explanation of Benefits (EOB), knowing your plan's appeal process, and a little persistence. The steps below cover what to do when your health benefits deny or don't cover a bill.
1. Start with Your Explanation of Benefits (EOB)
First, compare the provider's bill to the EOB from your insurance company. The EOB shows what was paid, denied, and why. Look for the claim adjustment reason code, a standard code (like CO-45 or PR-1) that tells you why the claim wasn't paid. Common reasons include:
- Not a covered service – The treatment isn't in your plan benefits.
- Out-of-network provider – You saw a doctor or facility outside your network.
- Pre-authorization not obtained – Some plans require approval before certain procedures.
- Overcharge or billing error – The provider billed the wrong amount or code.
- Duplicate billing – You're being billed for a service already paid.
Once you know the reason, decide if it's valid or a mistake. For instance, if the EOB says the service was not medically necessary but your doctor recommended it, you've got grounds for an appeal.
2. Contact the Provider and Your Insurance Company
Don't assume the bill is correct. Call the provider's billing department first. Explain that you got a bill for something your insurance denied. Often, they can resubmit with corrected codes or extra documentation. That's called a clean claim and can fix the issue fast.
If that doesn't work, call your insurance company's customer service. Ask for the specific policy language behind the denial. Write down the rep's name, the date, and a reference number. If it's a procedural error (like missing prior authorization), ask if the insurance will accept a retroactive authorization or if the provider can fix it.
3. File an Internal Appeal With Your Health Plan
If the provider's resubmission doesn't solve it, the next step is a formal internal appeal with your insurance. This is your legal right under ERISA (for employer-sponsored plans) or state laws. You usually have up to 180 days from the denial date to file.
- Gather all supporting documents: the EOB, the bill, medical records, a letter from your doctor explaining medical necessity, and any prior authorization paperwork.
- Write a clear, concise appeal letter. State your name, policy number, the service in question, and why the denial is wrong. Use facts: "My doctor prescribed this treatment because [reason], and it meets the plan's definition of medical necessity under Section [X]."
- Submit the appeal by certified mail or through your insurance company's online portal. Keep copies of everything.
- The insurer must decide within 72 hours for urgent situations, 30 days for care you have not yet received, and 60 days for care already provided.
If the internal appeal succeeds, you'll get a revised EOB showing coverage. If it's denied, you'll get a notice explaining why and your next steps.
4. Request an External Independent Review
If the internal appeal fails, you still have one more step: an external review by an independent third party. This is powerful because the reviewer isn't connected to your insurance company. Under the Affordable Care Act (ACA), most private plans must offer this, and the plan pays for the review, not you.
- Check your denial letter for instructions on how to start an external review. You must request it within four months after the final internal appeal denial. Some states set shorter deadlines.
- The independent reviewer will examine all documents and issue a binding decision. If they rule in your favor, the insurance company must cover the service.
- If you're still receiving treatment, you may qualify for an expedited external review if delaying care could cause serious harm.
External review works. KFF data shows about 44% of in-network marketplace claims were overturned on internal appeal in 2023. A 2025 JAMA analysis of roughly 51,000 New York cases found the share of denials overturned on appeal rose from 38% in 2019 to almost 53% in 2025. WellthCare™ uses AI-drafted, clinician-reviewed plans of care and compliance-grade recordkeeping within established federal frameworks such as ERISA and HIPAA, cutting down on the billing and coverage errors behind many disputes.
5. Negotiate With the Provider Directly
While disputing, don't let the bill go to collections. Contact the provider's financial assistance office or billing department. Explain you're actively disputing the charge. Many providers will offer:
- A discount (sometimes 20–50%) for a lump-sum payment.
- A payment plan with no interest.
- A charity care or sliding-scale discount based on income (especially at non-profits).
- A write-off if the insurance eventually pays.
Document every conversation. Often, providers will hold the bill for 30–60 days while you appeal.
6. Get Help From a Patient Advocate or Legal Counsel
If the bill is big (over $1,000), complex, or involves multiple denials, consider a professional patient advocate. They charge a flat fee or a percentage of savings and specialize in medical billing disputes. You can also contact your state's Department of Insurance for complaints about insurance company practices. For employer-sponsored plans, a benefits attorney familiar with ERISA can help if the insurer is mishandling the process.
Surprise Medical Bills: The No Surprises Act
Many of the most frustrating bills come from a different problem: an out-of-network provider you never chose. Since January 1, 2022, the federal No Surprises Act has banned balance billing in three situations: emergency services, non-emergency care from out-of-network providers at in-network facilities, and out-of-network air ambulance services. If you are insured, you generally cannot be charged more than your in-network cost sharing for these services. The plan and the provider work out payment between themselves through an independent dispute resolution process. You stay out of it.
If a bill looks like a surprise bill, do not pay it and do not assume the usual appeal rules apply. Contact the provider and your plan, cite the No Surprises Act, and ask them to correct the billing. Keep records. The law also requires uninsured and self-pay patients to receive a good-faith estimate before scheduled care. If the final charges substantially exceed that estimate, a separate dispute process lets you challenge the difference.
Preventing Future Bills: A Smarter Approach to Benefits
To avoid this headache again, look into benefits systems that align incentives with healthcare usage. Traditional plans often create friction between what you need and what's covered. That's where WellthCare comes in. It's the first Health-to-Wealth™ Benefit System, and it works alongside your existing plan. Employees get $0-co-pay care used first for preventive services, reward dollars they earn at the WellthCare Store™ for verified preventive health actions, and automatic retirement contributions. By design, WellthCare reduces the need to dispute bills because it catches issues early through preventive care. The WellthCare Store also includes a bill reduction service that helps employees dispute and reduce medical bills. It turns wasted healthcare spending into reward dollars for employees and savings for employers.
Don't pay a bill you don't owe without a fight. Use the appeal processes your insurance is legally required to provide. With the right documentation, persistence, and sometimes outside help, most disputed bills can be resolved in your favor. And for the future, consider benefits built to prevent these disputes from happening in the first place.