What is an EOB (Explanation of Benefits)?
An Explanation of Benefits is a statement from your insurance company — not a bill. It shows what your provider charged, what your plan agreed to pay, and what portion may become your responsibility. You don't pay an EOB; you pay the bill the provider sends separately.
What the columns usually mean
Most EOBs follow the same shape. 'Billed' or 'charged' is the provider's list price. 'Allowed amount' is the discounted rate your plan negotiated. 'Plan paid' is the insurer's share. 'Patient responsibility' is what may land on your bill — your deductible, copay, or coinsurance. The gap between billed and allowed is usually written off, not owed by you.
Why it's worth reading
The EOB is the closest thing you get to a receipt for a service you didn't choose the price of. It's also the document that tells you whether the bill you later receive actually matches what your insurer said you owe.
When it's worth questioning
- The provider's bill asks for more than the EOB's 'patient responsibility' line
- A service is listed that you don't remember receiving
- The claim was denied for a reason that doesn't match what happened
- You were charged the full billed amount instead of the allowed amount
- The same date of service appears on multiple EOBs for the same thing
Is it legit on your bill?
That's what it means in general. Fineprint reads your specific bill, flags the charges worth questioning, and drafts the letter for you — in about 60 seconds. Your first one is free.
Decode my bill freeFAQ
Is an EOB a bill?
No. It's an informational summary from your insurer. It often says 'This is not a bill' somewhere on it. The actual bill comes from the provider, and it should line up with the EOB's patient responsibility amount.
What if my bill doesn't match my EOB?
That's one of the most common billing errors worth questioning. Ask the provider's billing department in writing why the amount differs from the insurer's stated patient responsibility, and ask your insurer to confirm the correct figure.
How long should I keep EOBs?
Keep them at least until the matching bill is paid and resolved. Many people keep them for a year or more in case a charge resurfaces or goes to collections.
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This is general information, not legal, medical, or financial advice. Rules and protections vary by state and situation. For a specific or high-stakes bill, consider consulting a professional.