How to Read Your Health Insurance EOB in 5 Sections
Read your EOB in 5 sections using CMS guidance: general info, claim details, bill amounts, what you owe, and remark codes.
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An explanation of benefits, usually called an EOB, is the document your health plan sends after you receive care. It explains what was billed, what your plan will pay, and what you may still owe. Reading it in five parts turns a confusing page into a short checklist, and it helps you spot a bill that does not match what your plan says you owe.
Summary
Start with the general information at the top: you as the patient, your health plan, who provided your care, when it was provided, and a reference number called the claim number. Next, read the details about your claim, such as the date of service and a description of each service, like a medical visit, lab test, or screening. Then compare the three money figures: Provider Charges, Allowed Charges, and Paid by Insurer. Finally, read the Patient Balance and the remark codes, which explain notes about costs and charges.
EOB Sections at a Glance
| Section | What it shows | What to check |
|---|---|---|
| General information | Patient, plan, provider, date, claim number | The claim matches your visit |
| Claim details | Date of service and service description | Each service you received |
| Bill amounts | Provider, allowed, and paid amounts | How allowed differs from billed |
| What you owe | Patient Balance after insurer payment | Balance against your provider bill |
| Remark codes | Notes on costs and charges | Code descriptions at the bottom |
The table follows the layout of the CMS guide to reading an EOB. Working from top to bottom keeps you from skipping the claim number, which is useful to have on hand for any call or letter about that claim.
1. Confirm the general information
The EOB includes information about you, your health plan, who provided your care, when it was provided, and the claim number. It also names the payee, the person who gets reimbursed for any overpayments, and lists your health plan's phone number. If any of these details look wrong, call your health plan using the number on the EOB.
Keep the claim number with your records for that visit. If a second EOB arrives for the same care, compare the claim numbers before you assume it is a new charge.
2. Read the claim details line by line
The EOB gives details about your care, including the date of service and a service description that explains what you had, such as a medical visit, lab test, or screening. Go through each line and match it to care you actually received. A line for a service you did not receive, or a date you were not seen, is worth a call to your plan.
If one visit produced several lines, check each line separately. What matters is that every line traces back to care you recognize, on a date you recognize.
3. Compare the three money figures
The EOB lists the cost of your care and how much your health plan will pay. Provider Charges is the amount your provider bills for your visit. Allowed Charges is the amount your provider will be paid, and this may not be the same as the Provider Charges. Paid by Insurer is the amount your health plan will pay to your provider.
Your share comes only after the plan payment is applied. If a figure looks different from what you expected, ask your plan how it was set for that service, and keep the answer with the EOB.
4. Read what you owe, and compare it with your bill
What You Owe, also called Patient Balance, is the amount you owe after your insurer has paid everything else. You may have already paid part of the Patient Balance, because the EOB only shows what you owe, not whether you have already paid for it. Check your own payment records before you pay anything again.
Your bill from the provider should not be higher than the Patient Balance. If it is, talk to your provider first, with the EOB in hand, and ask which figure is correct. Keep notes from the call, including the date and the name of the person you spoke with.
5. Decode the remark codes
A remark code is a note from the health plan that explains more about the costs, charges, and paid amounts for your visit. The code is usually 2 or 3 letters and numbers. Check the bottom of the EOB for a description of each code, since the code alone does not explain itself.
If the description is unclear, call your plan and ask what the code means for your balance. Write the explanation on the EOB so you can follow it when you look at the document again in a few months.
How we chose
This guide follows the layout CMS uses in its EOB guide: general information, claim details, bill amounts, what you owe, and remark codes. Every definition in the table comes from that page, and the guide adds no figures that CMS does not publish.
Choosing order
- Confirm the patient, provider, date, and claim number at the top of the EOB.
- Match each service line to care you received, then compare Provider Charges, Allowed Charges, and Paid by Insurer.
- Compare the Patient Balance with your provider bill and read any remark code descriptions before you pay.
Before you finish
- Confirm the claim number matches the visit on every page of the EOB.
- Check that each service line matches care you received on the stated date.
- Confirm the Patient Balance against your own payment records.
- Compare your provider bill with the Patient Balance, and call the provider if the bill is higher.
- Look up every remark code in the descriptions at the bottom of the EOB.
This article is for general information, not financial advice.