The most common one
Why is my bill higher than my Explanation of Benefits says I owe?
Your insurer sent you an Explanation of Benefits with a line saying "what you owe" or "patient responsibility". Then the provider sent a bill asking for more than that.
This is the most common disagreement between the two documents, and it is worth a phone call every single time.
What the two documents are each saying
The bill is what the provider wants from you. The Explanation of Benefits is what your plan decided, after applying your deductible, your copay, your coinsurance, and the discount the provider agreed to as a condition of being in your network.
The EOB is not a bill and says so, usually in large letters. But the patient-responsibility figure on it is the number your plan has calculated you owe, and the provider agreed to that calculation when they joined the network.
Why they disagree
Most of the time it is timing or bookkeeping, not anything wrong:
- The bill was printed before the claim finished processing. Check the statement date against the "processed" date on the EOB. A bill dated earlier is describing a moment before your plan had decided anything.
- The contractual adjustment was not applied. The provider charged their list price, the plan allowed less, and the difference should be written off — but the statement still shows the list price.
- Something on the bill was never submitted to your plan. A separate lab or radiology charge, for instance, billed under a different claim you have not seen an EOB for yet.
- You are looking at two different dates of service. Worth ruling out first.
And sometimes it is a genuine error, which is why the question is worth asking.
What to ask
Please reconcile the balance against the Explanation of Benefits dated [date], which lists patient responsibility of [amount], and please tell me what the additional [difference] is for.
Ask for the answer in writing. If they say the EOB is out of date, ask which claim number superseded it, then ask your plan for that EOB.
What not to do
Do not pay it while you are asking. A corrected statement is much easier to get than a refund, and asking a question is not a refusal to pay.
Do not assume anyone is cheating you. Billing offices process a very large number of claims and a mismatch is more often a sequencing problem than anything else. Going in accusatory makes the person who could fix it in two minutes defensive instead.
If they will not budge
Ask for the itemized statement and the remittance advice — the document the plan sends the provider, which shows the same adjudication from their side. If the provider's own remittance shows a smaller patient responsibility than the bill, that is a very short conversation.
You can also call the number on your insurance card and ask your plan to contact the provider. A network provider billing above the allowed amount is a contract issue between them and the plan, and the plan has leverage you do not.
This is general information, not legal, medical or financial advice, and not a statement about your particular bill. A difference between two documents often has an ordinary explanation, and the billing office is the one who can give it.