When your EOB arrives — by mail or in your member portal — it looks like a bill. It is not a bill. It is your insurer’s accounting of what happened to your claim. Here is a real-world example decoded line by line.
The provider will send a separate bill for $280. Wait for that bill before paying anything. Compare it against the “Your responsibility” line above — if the provider asks for more than the EOB says, that is a potential billing error.
What Is an Explanation of Benefits?
An Explanation of Benefits (EOB) is a document your health insurance company sends after you receive covered medical services. It explains how your claim was processed, what the provider billed, what the insurance paid, and what you may owe. An EOB is not a bill — it is an accounting of how your insurance processed the claim. You pay the provider (or the provider bills you) separately.
When You Receive an EOB
You receive an EOB after each insurance claim is processed. If you had three separate appointments in a month, you may receive three EOBs. Most carriers now provide EOBs online through a member portal in addition to mailing paper copies. Reviewing EOBs promptly is important for catching billing errors before they go to collections.
Key Sections of an EOB
While layouts vary by carrier, most EOBs contain the same core information:
- Patient/member name: Who received the service.
- Provider name and service date: Which provider billed the claim and when the service occurred.
- Service description: A description of the services rendered, often using medical procedure codes (CPT codes) alongside plain-language descriptions.
- Amount billed: The full amount the provider charged. This is usually higher than what the insurance actually pays.
- Contractual adjustment / discount: The amount the provider agreed to write off as part of their in-network contract with your insurer. In-network providers cannot bill you for this amount.
- Amount allowed: The allowed amount after contractual adjustments. This is the amount the insurer and you together will pay.
- Amount paid by insurance: What your insurance company paid toward the allowed amount.
- Your responsibility: What you owe — after deductible, copay, or coinsurance. This is what you should expect to be billed by the provider.
- Reason codes: Codes explaining why a claim was adjusted or denied. Denials will include a reason code and instructions for how to appeal.
- Year-to-date deductible/OOP accumulations: Many EOBs show how much of your deductible and out-of-pocket maximum you have met to date.
EOB Example: Reading the Numbers
Say you have a $2,000 deductible and visited a specialist. Here is what an EOB might show:
- Amount billed: $400
- Contractual adjustment: -$120 (in-network discount)
- Amount allowed: $280
- Applied to deductible: $280 (you have $1,720 remaining in your deductible)
- Amount paid by insurance: $0
- Your responsibility: $280
The provider will send you a separate bill for $280. Do not pay until you receive the bill from the provider; the EOB alone is not a bill.
How to Spot Billing Errors on Your EOB
Medical billing errors are common. Check each EOB for:
- Duplicate charges: The same service billed twice.
- Services you did not receive: A procedure code for a service that was not performed.
- Incorrect diagnosis or procedure codes: A wrong code can make a covered service appear uncovered.
- In-network provider billed as out-of-network: If you confirmed the provider was in-network, but the EOB shows out-of-network processing, contact your insurer immediately.
- Preventive service billed with cost-sharing: Covered preventive services should have $0 patient responsibility. If your annual physical shows a balance owed, request an itemized bill from the provider and review the billing codes.
If you find an error, contact your insurer to dispute the claim. You can also request an itemized bill from the provider to compare against the EOB. Keep copies of all EOBs for at least 12 months after the plan year ends in case of disputes. For help navigating a billing issue or understanding your EOB, call (713) 575-9904.