What Is an Explanation of Benefits (EOB)?
Explanation of Benefits (EOB) — also called Explanation of Benefits, Explanation of Benefits
An Explanation of Benefits (EOB) is a statement from your health insurance company that explains how a medical claim was processed and what portion of the cost may be your responsibility. It is not a bill.
Official source: content.naic.org
An Explanation of Benefits (EOB) is a statement sent by your health insurance company after you receive medical care. An EOB explains how your insurance claim was processed, what services were billed, how much your health plan paid, and what portion of the cost may be your responsibility. An Explanation of Benefits is not a bill.
What is an Explanation of Benefits?
An Explanation of Benefits (EOB) is a summary of how your health insurance company processed a medical claim after a doctor, hospital, pharmacy, or other healthcare provider submits it.
The EOB helps you understand:
- What healthcare services were provided.
- How much your provider charged.
- What amount your insurance plan approved.
- How much your insurance paid.
- Whether you may owe any remaining balance.
Receiving an EOB does not necessarily mean you owe money.
If you owe a balance, you will generally receive a separate bill from your healthcare provider.
What information does an EOB include?
Although formats vary by insurance company, most Explanation of Benefits statements include:
- Date of service
- Healthcare provider's name
- Description of services received
- Amount billed by the provider
- Allowed amount under your insurance plan
- Amount paid by your insurance company
- Deductible applied
- Copayment or coinsurance owed
- Remaining patient responsibility
- Claim status
Some insurers also explain why a claim was denied or partially paid.
Is an EOB a bill?
No.
This is one of the most common misunderstandings about health insurance.
An Explanation of Benefits is not a request for payment.
Instead, it explains how your insurance company processed your claim.
If you owe money, your healthcare provider will typically send a separate medical bill after receiving payment from your insurance company.
Comparing your provider's bill with your EOB can help ensure the charges are accurate.
Why do insurance companies send EOBs?
Insurance companies send EOBs to increase transparency and help members understand how healthcare claims are processed.
Reviewing your EOB allows you to:
- Verify that you received the services listed.
- Check that your insurance processed the claim correctly.
- Identify billing errors.
- Detect possible insurance fraud or identity theft.
- Better understand your healthcare costs.
Federal agencies and consumer advocates encourage members to review every Explanation of Benefits they receive.
What should you do if something looks wrong?
If you notice incorrect information on an EOB:
- Compare the EOB with your provider's bill.
- Confirm that you actually received the listed services.
- Contact your healthcare provider if you believe a billing error occurred.
- Contact your insurance company if you believe the claim was processed incorrectly.
- Keep copies of your records while the issue is being reviewed.
Many billing errors can be resolved by contacting the provider or insurer promptly.
Explanation of Benefits vs. medical bill
These documents serve different purposes.
Explanation of Benefits (EOB)
- Sent by your insurance company.
- Explains how your claim was processed.
- Not a request for payment.
Medical bill
- Sent by your healthcare provider.
- Requests payment for any remaining balance after insurance processing.
Reviewing both documents together provides the clearest picture of your healthcare costs.
Explanation of Benefits vs. Medicare Summary Notice
People with Medicare may receive a similar document called a Medicare Summary Notice (MSN).
Like an EOB, an MSN summarizes:
- Services received.
- Claims processed.
- Medicare payments.
- Any potential amount you may owe.
An MSN is also not a bill.
Why this matters
Healthcare billing can be confusing, especially when multiple providers and insurance companies are involved. Understanding your Explanation of Benefits helps you verify claims, recognize potential billing mistakes, and better understand how deductibles, copayments, and coinsurance affect your out-of-pocket maximum and other out-of-pocket costs.
Taking a few minutes to review each EOB can also help identify fraudulent claims before they become larger problems.
In real life
- After visiting a specialist, a patient receives an Explanation of Benefits showing that the insurance company paid most of the claim while the remaining balance applied toward the patient's deductible.
- A family notices an unfamiliar medical procedure listed on an EOB and contacts the insurance company to investigate a possible billing error.
- A Medicare beneficiary compares a Medicare Summary Notice with a provider's bill before making payment.
Also known as
Take the next step
Frequently asked questions about Explanation of Benefits (EOB)
What is an Explanation of Benefits?+
An Explanation of Benefits (EOB) is a statement from your health insurance company explaining how a medical claim was processed and what portion of the costs may be your responsibility.
Is an EOB a bill?+
No. An EOB is not a bill. If you owe money, you will usually receive a separate bill from your healthcare provider.
Why did I receive an EOB if I already paid my doctor?+
Healthcare providers often submit insurance claims after your visit. Your EOB shows how the claim was processed, even if you already made a payment.
What should I do if my EOB contains an error?+
Compare the EOB with your provider's bill, verify that you received the listed services, and contact your provider or insurance company if something appears incorrect.
Does Medicare send an Explanation of Benefits?+
Original Medicare generally sends a Medicare Summary Notice (MSN) rather than an EOB. The MSN serves a similar purpose by explaining how Medicare processed your claims.
Should I keep my EOBs?+
Yes. Keeping EOBs with your medical bills can help you verify charges, resolve billing questions, and maintain records for future reference.
Sources
- Claims & Appeals
Medicare.gov — medicare.gov - Mailings You Get From Medicare
Medicare.gov — medicare.gov - Consumer's Guide to Health Insurance
National Association of Insurance Commissioners — content.naic.org - Using Your Marketplace Coverage
HealthCare.gov — healthcare.gov - No Surprises: Protections Against Surprise Medical Bills
Centers for Medicare & Medicaid Services — cms.gov