How to Dispute a Coverage Denial or Medical Bill

Getting a coverage denial or an unexpected medical bill is frustrating. You have rights, and there’s a clear path to push back. Whether your health plan refused to pay for a service you thought was covered or a provider sent you a bill that looks wrong, act fast, stay systematic, and put everything in writing. This isn’t about being adversarial—it’s about making sure the system works and you don’t pay for something that should have been covered or was charged in error.

First, figure out what kind of dispute you’re in. A coverage denial means your health plan decided a service wasn’t medically necessary, wasn’t covered, or wasn’t pre-approved. A billing dispute involves charge errors, duplicate billing, or services you never got. Each needs a slightly different approach, but both start with verification and documentation.

Gather Your EOB and Medical Bill

Before you dispute anything, collect your documents. You’ll need:

• Your Explanation of Benefits (EOB) from your health plan—it shows what was billed, what was covered, and why it was denied.
• The medical bill from your provider—the actual charge for services.
• Your plan documents or Summary of Benefits and Coverage (SBC)—to verify coverage and exclusions.
• Any prior authorization letters or referral notes, if you have them.

Compare the EOB and the bill side by side. A common mistake: a provider bills more than the allowed amount, or you get a bill before your insurance has finished paying. If the amount on the bill doesn’t match what the EOB says you owe, call the provider first—before disputing with your insurance.

How to Dispute a Coverage Denial

If your plan denied coverage, start by understanding exactly why. The EOB includes a denial code and a brief explanation. Typical reasons: “not medically necessary,” “experimental treatment,” “out-of-network provider,” or “missing pre-authorization.” Once you know the why, you can build your case.

Step 1: File an Internal Appeal

Most employer-sponsored plans fall under ERISA (Employee Retirement Income Security Act), which gives you the right to appeal. Here’s how:

1. Read the denial letter carefully. It includes the appeal deadline—usually 180 days from when you get the denial.
2. Call your plan’s customer service to confirm the process and ask for the full claims file, including the clinical criteria they used.
3. Write a formal appeal letter with your name, member ID, claim number, the denied service, and why you think the denial was wrong. Include supporting evidence like:
   • Medical records, doctor’s notes, or letters from your provider explaining why the service was necessary.
   • Copies of plan documents showing the service is covered.
   • Any prior authorization numbers or communications.
4. Send the appeal via certified mail or through your plan’s online portal if they allow it. Keep copies of everything.
5. Wait for a decision. The plan must respond within 30 days for non-urgent claims (72 hours for urgent ones). If they deny again, you can request an external review.

Step 2: Request an External Review

If the internal appeal is denied, ERISA requires your plan to let you have an independent external review. The denial letter will explain how to request one. An independent third party will review your case, and their decision is binding on the plan. It’s a strong tool—insurers often reverse decisions at this stage. You can also contact your state’s Department of Insurance or the U.S. Department of Labor for help.

How to Dispute a Medical Bill

If your dispute is about the bill itself—not the insurance denial—start with the provider. Billing errors are common, especially after a complex procedure.

1. Review the bill for errors. Common mistakes include:
   • Duplicate charges for the same service.
   • Services you never received.
   • Wrong procedure codes or ICD-10 codes.
   • Balance billing from an out-of-network provider at an in-network facility.
2. Call the provider’s billing department. Politely explain the discrepancy. Ask for an itemized bill if you didn’t get one. Many errors get resolved with a simple phone call. WellthCare's Health-to-Wealth system includes medical bill review and cost transparency tools that can catch those errors before they reach you, reducing frustration and unnecessary charges.
3. File a formal written dispute. If the call doesn’t fix it, send a letter to the provider’s billing manager and the hospital’s patient advocate. Include copies of the bill, your EOB, and any correspondence. Request a corrected bill.
4. Consider a payment plan or financial assistance. If the bill is correct but you can’t pay, many hospitals offer charity care or income-based discounts. Ask about their financial assistance policy.
5. Report violations. If you think you’ve been unfairly balance-billed or charged for services that should have been covered, file a complaint with your state’s insurance commissioner or the Consumer Financial Protection Bureau (CFPB).

Key Protections You Should Know

• The No Surprises Act (2022) protects you from surprise out-of-network bills for emergency services and certain non-emergency care at in-network facilities. If you get a surprise bill, call the provider and your plan—the Act may require them to fix it.
• HIPAA Privacy Rules give you the right to access your medical records, which can be critical for proving medical necessity in a denial dispute.
• ERISA protections guarantee your right to appeal and external review, and prohibit plans from retaliating against you for filing a dispute.
• State consumer protection laws may offer additional rights, especially for fully insured plans. Check with your state’s insurance commissioner.

When to Get Help

If the process feels too complex or the amount is significant, you can get help from:

• Patient advocates — many nonprofits and private services offer dispute assistance.
• State Health Insurance Assistance Programs (SHIPs) — especially helpful for Medicare-related disputes.
• An attorney — if you’re facing a large denial related to a chronic condition or serious illness, a health law attorney can be worth the investment.
• Your employer’s HR/Benefits team — since many employer plans are self-funded, your HR team may have direct sway with the plan administrator and can escalate internally.

Disputing a coverage denial or medical bill is a learned skill, but you don’t need to be an expert. Stay organized, stick to deadlines, and don’t give up. Most errors and denials are reversible when you follow the right process. And remember: the system works best when you advocate for yourself—persistently and patiently.