Claim still in process
Bill mailed before insurer finished paying. Wait for the next statement.
Bill vs EOB
When the bill and the EOB don't agree.
An Explanation of Benefits is your insurer telling you what they paid and what you owe. A patient statement is your provider telling you what to send. When the two disagree, the bill is usually the one that's wrong.
The six fields that matter
What to compare.
Six fields decide whether your bill is right or wrong. Compare them line-by-line.
- Allowed amount — the negotiated rate between your insurer and the provider. The most a network provider can charge.
- Plan paid — what your insurer actually paid.
- Patient responsibility (PR) — what you owe per the EOB.
- Provider statement balance — what the provider is asking for.
- Date of service — must match across documents.
- CPT code — must match across documents.
If the provider statement balance is higher than the EOB's patient responsibility, the bill is probably wrong. The most common causes are timing issues, claim resubmissions, or balance billing.
Common scenarios
Why they don't match.
Provider is balance-billing
Charging the difference between what they billed and what the insurer allowed. Illegal for most network care.
Out-of-network surprise
Even at an in-network facility, an out-of-network provider can balance-bill — but the No Surprises Act often blocks it.
Coding error
Provider used a code your insurer didn't cover. Easy to fix at the provider level.
Different date of service
The bill bundles services from multiple visits. Always check the date.
Charge for non-covered service
Insurer denied a specific line. The provider then bills you for it. Sometimes legitimate, sometimes appealable.
FAQ
Common questions.
Should I trust the EOB or the medical bill first?
Trust the EOB first, then reconcile the medical bill against it. The EOB is your insurer's authoritative record of what was billed, what they allowed, what they paid, and what you owe. Up to 49% of medical bills contain at least one error (CFPB, 2023), and most bill-vs-EOB mismatches resolve in your favor once you compare provider, date of service, claim number, allowed amount, and patient responsibility line by line.
Can I refuse to pay if the bill and EOB don't match?
You can dispute a medical bill that doesn't match the EOB while the discrepancy is being resolved — most providers will not send the account to collections during an active written dispute, but ask in writing and keep a copy. About 73.7% of patients who actually dispute a medical bill receive a correction (JAMA Health Forum, 2024). The right move is to pause payment, request the itemized bill, and reconcile line by line first.
What if I don't have an EOB for the medical bill?
If you don't have an EOB for the medical bill, log into your insurer's member portal — every processed claim has a downloadable EOB there. If the provider claims they never submitted to insurance, treat that as a red flag and ask why. Up to 49% of medical bills contain at least one error (CFPB, 2023), and provider bills sent before insurance processes are one of the most common error sources.
How long should I wait before disputing a bill-vs-EOB mismatch?
Wait about 30 days before formally disputing a bill-vs-EOB mismatch — insurance claim processing usually completes within that window, and a lot of "mismatches" are simply bills mailed before the insurer finished paying. About 73.7% of patients who actually dispute a medical bill receive a correction (JAMA Health Forum, 2024), but disputes go smoother once the final EOB is in hand and you can compare allowed amount, insurer payment, and patient responsibility directly.
Have a bill in front of you right now?
The free scan answers one question in 60 seconds: does this bill deserve a closer look?