Your insurer says you owe $180. The hospital sends a bill for $680. Which number is right?
These amounts are an illustration, not a customer result.
Quick answer
See CMS guidance for an in-network bill. Out-of-network bills can involve different rules; see our out-of-network billing guide.
1. Compare the amount you owe, not the original charge
An Explanation of Benefits, or EOB, records how your insurer processed a claim. It is not a bill.
Look for “patient responsibility,” “patient balance,” or “what you owe.” The provider's original charge and the insurer's allowed amount are different figures. Neither necessarily equals your remaining balance.
Also check payments you already made. CMS notes that an EOB may not reflect money you paid directly to the provider. Our guide to reading an EOB explains the columns.
2. Make sure you are comparing the same services
Put the bill and EOB side by side. Match:
- Patient name.
- Provider or facility.
- Date of service.
- Claim number, where available.
- Services included.
One visit can generate several bills and EOBs. A hospital statement may include charges that appear across multiple claims, while a doctor's bill may be separate.
Ask the insurer whether the EOB you have reflects the latest processing. Ask the provider for an account statement showing charges, insurance payments, adjustments, and your payments.
If the bill only shows a total, use our itemized bill request guide.
3. Ask the billing office to reconcile the difference
Use this script:
“I'm calling about my bill for [date of service]. Your statement shows I owe [amount], but my insurer's EOB shows patient responsibility of [amount] for what appears to be the same care.
Please check that all insurance payments, adjustments, and payments I made have been applied. If you believe the additional amount is my responsibility, please send me a written explanation identifying the charge and the reason.”
Then ask:
“Can you place the disputed balance on hold while you review it? Please confirm whether late fees and collection activity will be paused, and when I should follow up.”
Request a hold explicitly. Do not assume that making a phone call automatically pauses billing deadlines.
Record the representative's name, reference number, and agreed follow-up date.
4. Contact your insurer if the explanation still does not add up
Have both documents ready and ask:
“Can you confirm my responsibility for claim [number], whether the provider was processed as in-network, and whether any part of this amount is a provider adjustment rather than an amount I owe?”
Ask whether the insurer can contact the billing office with you.
If the bill accurately reflects the EOB but you believe the insurer processed the claim incorrectly, the next step may be an insurance appeal. Follow the instructions and deadline in your denial notice or plan documents. HealthCare.gov explains your appeal rights.
Our denied hospital claim guide explains that situation separately.
5. Get the corrected balance in writing
If the billing office agrees to correct the account, request an updated statement showing the adjustment and remaining balance.
If you already paid, ask whether the correction creates a credit and how any refund will be issued.
Keep the original bill, relevant EOBs, payment receipts, and written responses together. Follow up on the date you agreed, even if another statement has not arrived.
What if the bill is correct but still unaffordable?
Once the balance has been verified, ask about financial assistance, available discounts, and payment terms. Our guide to negotiating a medical bill after insurance covers those next steps.
Sources
- CMS, Action plan: Bill with an in-network provider
For in-network care, compare the bill with the EOB and contact the provider about differences. If they match but you believe the insurer made an error, ask the insurer to reconsider through an appeal.
- CMS, How to read an explanation of benefits
An explanation of benefits shows the total charges for a visit and is explicitly not a bill; it shows what the plan covered and what you will owe when the provider invoices you.
- CMS, How to read your medical bill
Explains what each part of a medical bill means and says to compare the bill with the explanation of benefits, which can arrive separately for each provider or facility involved in one episode of care, to make sure the amounts are correct before paying.
- HealthCare.gov, Internal appeals
You must file an internal appeal within 180 days of being notified your claim was denied, and the insurer must decide within 30 days for pre-service and 60 days for post-service claims.
Sources last checked 10 October 2026. Medical billing rules change, so if you spot something out of date, tell us and we will correct it.
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