What Is an Explanation of Benefits (EOB)? Is It a Bill?
An Explanation of Benefits, often called an EOB, is a summary from your health insurance plan after it processes a claim. It shows the care listed, the amounts charged, what the plan paid and what you may owe. It can look like a bill, but it usually serves a different purpose.
Leer esta guía en españolWhat an EOB tells you
A doctor, hospital, laboratory or other provider sends a claim to your insurance plan. The claim asks the plan to pay for care under your coverage. After the plan reviews it, you may receive an EOB on paper or in your online insurance account.
The EOB connects the care you received with the plan's payment decision. It usually names the patient and provider, lists the service date and includes a claim number. Keep that claim number handy when you call with a question.
- The service or supply listed on the claim.
- The amount the provider charged.
- The amount your plan allows under its rules.
- What the plan paid and what it did not cover.
Is an EOB a bill?
No. An EOB is an insurance summary, not a request for payment from your provider. The provider may send a separate bill later. Some EOBs print the words “This is not a bill” near the top or bottom.
The line saying what you may owe is an estimate of your share under the claim decision. It does not always include a payment you already made at the office. Before paying, compare the EOB with the provider's own statement and check that the service, dates and amounts match.
Understand the money columns
Different plans use different labels, so read the heading above each number. Two columns that look similar may mean very different things.
- Amount billed or provider charges: the price the provider put on the claim.
- Allowed amount: the amount used by the plan under its contract or coverage rules.
- Plan paid: the money the insurance plan paid toward the claim.
- Deductible: the part counted toward what you pay before certain plan payments begin.
- Copay or coinsurance: your set payment or percentage share, when those apply.
- Not covered: an amount the plan did not pay; look for the printed reason or code.
Read codes and claim decisions
An EOB may use a reason code, remark code or short message to explain an adjustment or denial. The same code can be confusing without the plan's explanation. Look for a code list on the page, the back of the notice or the plan's website.
Do not guess what a code means from the letters alone. If the notice does not explain it, ask the insurance plan. Also check whether the claim was paid, partly paid, denied or needs more information. A denial may have an appeal deadline and instructions.
What to check before you pay
Start with your name, the provider, the date and the service. Make sure you received the listed care. Then compare the amount the provider bills you with the amount the EOB says you may owe.
If something does not match, call the provider's billing office or the member-services number on your insurance card. Ask for an explanation and, if needed, a corrected claim. Keep notes of the date, the person you spoke with and the answer. If you disagree with a coverage decision, follow the appeal instructions on the notice and watch every deadline.
Sample — not a real document.
Sunbridge Health Plan: sample EOB
This made-up example shows how one service might appear. Your own plan may use other labels.
- Service
- Office visit — March 12, 2026
- Provider
- Riverbend Clinic
- Provider charged
- $180.00
- Allowed amount
- $120.00
- Sunbridge paid
- $85.00
- You may owe
- $35.00
The $35.00 is the possible share shown on this sample EOB. Compare it with Riverbend Clinic's separate bill before paying.
Official sources
Common questions
Should I pay the amount on an EOB?
Wait for the provider's bill and compare it with the EOB. The documents should list the same care and a matching patient share. If they do not, contact the provider's billing office and your insurance plan before paying.
Why does the EOB show a larger charge than my bill?
The provider's first charge may differ from the plan's allowed amount. Plan adjustments and payments can change the final patient share. Ask the provider and plan to explain any difference you do not understand.
What if my EOB says a claim was denied?
Read the printed reason and look for appeal instructions and a deadline. Contact the plan using the number on your insurance card. Your provider's office may also need to correct or supply claim information.
Have a letter of your own?
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