How to Read Your EOB (Explanation of Benefits)

After a doctor visit, your insurer sends an Explanation of Benefits, or EOB. It looks like a bill, it has dollar amounts on it, and it's genuinely confusing — so most people either panic or ignore it. Here's the first thing to know: an EOB is not a bill. It's a summary of what happened between your provider and your insurance. Learning to read it is one of the best ways to catch billing mistakes before you pay.

EOB vs. bill: what's the difference?

Your EOB comes from your insurance company and explains what was charged, what they covered, and what you may owe. Your bill comes from your provider (the hospital or clinic) and asks for payment. The key move: when the bill arrives, compare it to the EOB. They should agree on what you owe.

The columns on your EOB, explained

• Amount billed / charged. What the provider charged your insurer for each service. This is often the highest, "sticker price" number.
• Allowed amount. The maximum your insurer will pay for that service. In-network providers agree to accept this, so the difference between "billed" and "allowed" is usually written off — you don't owe it.
• Plan paid / insurance paid. What your insurer actually paid.
• Patient responsibility / you may owe. Your share — made up of deductible, copay, and/or coinsurance. This is the number your provider's bill should match.
• Reason / remark codes. Short codes explaining any denial or adjustment. If something wasn't covered, the code tells you why.

How to actually check your EOB

1. Confirm the date of service and provider are correct.
2. Make sure every service listed is one you actually received.
3. Check that your in-network status was applied — an out-of-network rate on an in-network visit inflates what you owe.
4. When the provider's bill arrives, line it up against the EOB's "patient responsibility."
5. If anything doesn't match, call your insurer and the provider's billing department.