Your EOB (Explanation of Benefits) is your insurer's record of what a provider billed, what they covered, and what they say you owe. It is not a bill — it's a summary of how the claim was processed. When the provider's actual bill doesn't match it, one of a few things is usually going on.
Common reasons for a mismatch
- Timing — the bill was generated before the claim finished processing, and hasn't been updated with the insurer's final numbers.
- The provider billed for something the insurer never saw — a claim submission error, not necessarily fraud.
- The insurer processed the claim incorrectly — wrong plan year, wrong deductible status, or a benefit applied incorrectly.
- A charge was denied and the provider is now billing you for it directly, which may or may not be appropriate depending on why it was denied.
What to check first
Line up, side by side: the total billed, the insurer's allowed amount, what insurance paid, and what's listed as "patient responsibility" on the EOB — against the actual dollar amount the provider is asking you to pay. If the provider's number is higher than the EOB's patient-responsibility figure, ask the billing office directly why, referencing the EOB.
When to call your insurer instead of the provider
If the EOB itself looks wrong — a denial you don't understand, a deductible that doesn't match your plan, an in-network provider processed as out-of-network — that's a conversation with your insurer, not the billing office. Ask specifically what information they used to process the claim and whether it can be reprocessed.
Keep both documents
Don't let go of either the bill or the EOB until the discrepancy is resolved — you'll need both any time you follow up, and a reviewer (including RomiCare) needs to see them together to say anything useful about the mismatch.