Quick answer
An explanation of benefits (EOB) is a statement from your health plan that shows how it handled a claim: what the provider charged, the discounted amount the plan allows, what the plan paid and what you may owe. It isn’t a bill. Compare it with any bill you get from the provider before you pay.
Key takeaways
- Your insurer sends an EOB after it processes each claim, by mail or in your online account.
- The patient responsibility line shows the most you should owe the provider for that service.
- Check names, dates and services for mistakes or care you never got.
- If the EOB shows a denial, you can appeal.
- Original Medicare sends a Medicare Summary Notice instead of an EOB.
On this page
What’s on an EOB
| EOB item | What it means |
|---|---|
| Patient and member ID | Who got the care, and the ID number from your insurance card |
| Provider | The doctor, hospital or lab that billed the plan |
| Date of service | When you got the care |
| Service | What was done, often with a billing code |
| Amount billed | The provider’s full charge |
| Allowed amount | The plan’s negotiated rate, or the most it allows for out-of-network care |
| Plan paid | What your insurer paid the provider |
| Deductible, copay and coinsurance | Your share, and which part of your coverage it falls under |
| Not covered | Any amount the plan didn’t cover, with a remark code explaining why |
| Patient responsibility | The total you may owe the provider |
Many EOBs also show how much of your deductible and out-of-pocket maximum you’ve met so far this year.
Reading an EOB: an example
Say you get blood tests at an in-network lab. Your EOB shows:
- Amount billed: $400
- Allowed amount: $120
- Plan paid: $0, because you haven’t met your deductible
- Patient responsibility: $120
The other $280 is the network discount, and the lab can’t bill you for it. If the lab sends you a $400 bill, call them and point to the EOB. Later in the year, after you meet your deductible, an EOB for the same test might show the plan paying most of the cost and you paying coinsurance or a copay.
What to check on every EOB
- Names. Make sure the care was for you or someone on your plan.
- Services you don’t recognize. They could be billing errors or fraud. Call your insurer.
- Network status. If an in-network provider was processed as out of network, ask for a correction. See how to find out if a doctor is covered by your insurance and what to do about out-of-network costs.
- Denials and remark codes. The code tells you why something wasn’t paid. You can appeal a denial.
- Duplicates. Look for services listed twice, especially after long hospital stays, when bills have many line items.
EOB vs. bill
The EOB comes from your insurer. The bill comes from the provider. When you can, wait for the EOB before paying a provider’s bill. If the bill is higher than the patient responsibility on your EOB, call the provider’s billing office and ask why.
Keep EOBs at least until the bill is settled, and longer if you pay with an HSA or deduct medical expenses on your taxes. Most insurers keep them in your online account.
What your EOBs tell you about your coverage
A year of EOBs shows how much your health insurance actually covers. If you pay a lot before your plan starts paying, think about whether a high or low deductible fits you better at the next open enrollment. You can also compare the best health insurance companies or look at the cheapest ways to get health insurance.
Shopping for a plan with better coverage? Compare quotes by ZIP code.
Frequently asked questions
Is an explanation of benefits a bill?
No. It’s a summary from your insurer. You pay the provider only when you get a bill, and it shouldn’t be more than the patient responsibility on your EOB.
Why did I get an EOB for a free checkup?
Insurers send one for every claim, including care that costs you nothing. It should show $0 patient responsibility. If it doesn’t, ask your insurer whether the visit was billed as preventive care.
How long after a visit will I get an EOB?
Usually a few weeks after the provider files the claim. Job-based plans generally must decide claims for care you’ve already had within 30 days.
What is a Medicare Summary Notice?
It’s Original Medicare’s version of an EOB, mailed every few months when you’ve had claims. Medicare Advantage and Part D plans send their own EOBs.
Sources
This article is general information, not insurance advice. EOB layouts and terms vary by insurer. Last reviewed September 2026.