How to Read Your Health Insurance Explanation of Benefits

After you see a doctor or fill a prescription, your health insurance company sends you a document called an Explanation of Benefits, or EOB. Many people mistake this for a bill and panic — or assume it means nothing and throw it away. Neither reaction is right. An EOB is a summary of what happened with your claim: what was submitted, what insurance agreed to pay, and what (if anything) you owe. Understanding it can save you money and help you catch billing errors before they become collection calls.

The top of an EOB identifies you (your name and member ID), the date of service, and which provider submitted the claim. Always confirm these match your actual visit. Wrong member ID or wrong provider is a red flag for fraud.

The middle section breaks down the claim line by line. You'll see a "billed amount" — what the provider charged — followed by an "allowed amount" — the maximum your insurance agreed to pay under their contract with the provider. The difference between billed and allowed is written off. You don't owe it. Then the EOB shows how much insurance paid, and how much goes toward your deductible, copay, or coinsurance.

At the bottom you'll see a "your responsibility" total. This is what you may owe the provider. I say "may" because the EOB is not a bill — the provider will send a separate bill. Wait for that bill before paying anything.

Look at the "reason codes" column, usually a series of numbers or letters. Each code explains why a claim was denied or adjusted. Common codes include "service not covered," "out-of-network provider," or "deductible not met." If you get a denial you don't agree with, you have the right to appeal — the EOB must by law explain how to do this.

Keep every EOB for at least one year and match them against provider bills. Billing errors are surprisingly common. If you received a service and there's no corresponding EOB within four to six weeks, call your insurance company.