Step 1: Gather your documentation
Before contacting anyone, collect three documents: the itemized bill from the hospital, the Explanation of Benefits (EOB) from your insurer, and any medical records or discharge summary relevant to the disputed services.
Compare the itemized bill to the EOB line by line. Write down every discrepancy. Note the specific charge, the amount, the date of service, and the reason you believe the charge is incorrect. This list becomes the foundation of your dispute letter.
Step 2: Contact the hospital billing department first
Call the billing department and ask them to review the specific charges you identified. Have your account number ready. Ask for the name and direct contact information of the person handling your account.
Many errors are corrected at this stage. Hospitals make data entry mistakes, and billing staff can often remove a duplicate charge or correct a code without a formal dispute. Ask for written confirmation of any correction.
Step 3: Send a written dispute letter
If the phone call does not resolve the issue within 10 to 14 days, send a dispute letter by certified mail with return receipt. The letter should state: your account number, each disputed charge with its code and dollar amount, the reason each charge is incorrect, and the specific correction you are requesting.
Do not pay the disputed amount while the dispute is active. Write "amount in dispute" on any partial payment you make. Keep a copy of the letter and the certified mail receipt.
Step 4: Escalate to your insurer and regulators
Send a copy of your dispute letter to your health insurer at the same time. If the bill involves services that should be covered, file a claim appeal with your insurer. Under the Affordable Care Act, you have the right to an internal appeal and then an independent external review.
If neither the hospital nor the insurer resolves the dispute, file a complaint with your state insurance commissioner. The CFPB also accepts complaints about medical billing. For billing from federally qualified health centers, you can escalate to the HHS Office of the Inspector General.
Your rights during a dispute
Under the No Surprises Act, hospitals and providers must give you a good faith cost estimate before scheduled procedures. If the final bill exceeds that estimate by more than $400, you have the right to dispute it through the federal patient-provider dispute resolution process.
Disputes do not automatically pause collections. If you receive a collections notice while a dispute is active, send a written debt validation request within 30 days. Under the Fair Debt Collection Practices Act, collectors must cease collection activity until they validate the debt.
Frequently asked questions
How long do I have to dispute a medical bill?
There is no single federal deadline, but most hospitals and insurers require disputes within 90 to 180 days of the bill date. Check your EOB and the bill itself for specific deadlines. For insurance appeals, the ACA requires insurers to allow at least 180 days from the denial date.
Can a hospital send my bill to collections while I am disputing it?
Technically yes, but under the CFPB rules that took effect in July 2022, medical debt under $500 cannot appear on credit reports. Debts over $500 that are paid cannot appear on credit reports. A written dispute letter creates a paper trail that can support your position if a collector contacts you.
What if the hospital refuses to correct a clear error?
Escalate to your state insurance commissioner, file a complaint with the CFPB at consumerfinance.gov/complaint, and contact your state attorney general if the hospital is not for-profit. For Medicare or Medicaid billing errors, file a complaint with CMS.
Should I hire a lawyer to dispute a medical bill?
For most disputes under $5,000, a lawyer is not cost-effective. A medical billing advocate can be more practical. For larger amounts or if the hospital threatens legal action, consult an attorney who specializes in consumer debt or healthcare billing.