How to Read an EOB, and the Appeal Date Printed on It
To read an EOB, find four lines: what the provider billed, the allowed amount, what your plan paid and what you may owe. An EOB is not a bill. If a claim was denied, the notice also tells you how long you have to appeal.
To read an EOB (Explanation of Benefits), look for four lines for each service: what the provider billed, the allowed amount your plan accepts, what the plan paid, and what you may owe. An EOB is not a bill. The bill comes later from the doctor or hospital, and the amount on it should match the "you may owe" line. If the plan denied all or part of a claim, the EOB or the denial notice also explains how to appeal and by when. Find that date and write it down.
An EOB arrives a few weeks after a doctor's visit, a test or a hospital stay. It looks like a bill, it has numbers that do not match anything you remember paying, and somewhere on it there may be a deadline. Here is how to read it in five minutes.
What is an EOB, and is it a bill?
An Explanation of Benefits is a statement from your health plan. It shows what the provider charged, what the plan agreed to pay, and what part of the cost is yours. It is not a bill, even when it shows an amount you owe. The bill, if there is one, comes from the doctor's office, lab or hospital.
That is why the EOB matters: it is how you check the bill. If the provider later asks for more than the EOB says you owe, that is the moment to call.
How to read an EOB, line by line
Every plan lays out its EOB a little differently, but the same columns appear on almost all of them:
| EOB line | What it means | What to check |
|---|---|---|
| Patient and claim number | Who got care, and the plan's ID for this claim | That it is your family member and a visit you recognize |
| Provider and date of service | Who billed and when | The date and the place match your visit |
| Amount billed | What the provider charged the plan | Nothing to pay here; it is often much higher than the rest |
| Allowed amount | The most the plan will pay for this service | Your share is based on this number, not the billed one |
| Plan paid | What your plan paid the provider | Zero can mean a denial or that you have not met your deductible |
| You may owe | Your share: deductible, copay, coinsurance, or care not covered | The number to compare with the provider's bill |
| Remark or reason codes | Short codes explaining a reduction or denial | Look them up in the key at the bottom of the EOB |
The allowed amount, in the words of HealthCare.gov, is "the maximum amount a plan will pay for a covered health care service." If a provider charges more than that, you may have to pay the difference, which is called balance billing. HealthCare.gov adds that a preferred, in-network provider may not balance bill you for covered services.
The steps when the EOB and the bill arrive
- Keep the EOB when it comes, by mail or in your plan's app.
- Wait for the provider's bill. Do not pay from the EOB.
- Compare the amounts. The bill should match "you may owe" for the same date of service.
- If they differ, call the provider's billing office with the claim number from the EOB. A common reason is that the bill went out before the plan finished processing the claim.
- If the plan paid less than you expected, call the plan and ask what the reason code means.
No EOB at all for a visit? The claim may never have been sent. Our guide on how long you have to submit an insurance claim covers the filing limits.
The appeal date: how long do you have to appeal a denied claim?
If the plan denies a claim, all or part of it, you can ask it to reconsider. HealthCare.gov describes this as an internal appeal, and the rule it lists is clear: you must file within 180 days, about 6 months, of receiving notice that your claim was denied.
Three things to know about that date:
- The clock starts with the denial notice. That can be the EOB itself or a separate letter. Your exact deadline and the address to send the appeal are printed on the notice.
- The plan has deadlines too. For care you have already received, HealthCare.gov says the insurer must notify you of a denial in writing within 30 days. Urgent cases move faster.
- There is a second step. If the plan says no again, you can ask for an external review by an independent reviewer. The request has to be filed within 4 months of the final denial. A standard external review is decided within 45 days.
These are the federal rules HealthCare.gov describes for health insurance plans. Medicare and Medicaid have their own appeal processes and dates. Whatever your plan, the date on your own notice is the one that counts.
What to send with an appeal
HealthCare.gov's checklist for an internal appeal is short: complete your plan's appeal form, or write a letter with your name, claim number and insurance ID number, and add any information you want the plan to consider, such as a letter from your doctor. Keep copies of everything you send and receive.
The Consumer Assistance Program in your state can help file the appeal. For a surprise bill from an out-of-network provider, the federal No Surprises Act protections may apply as well.
Let Tracy keep the EOB and its date
EOBs pile up, and the one that matters is easy to lose among the ones that say $0. Tracy, the assistant in dEssence, keeps them for you. Send a photo of the paper EOB, a screenshot from your plan's app or the PDF, from Telegram, iMessage, Chrome or the web. She pulls out the provider, the date of service, what you may owe and, when it is printed, the appeal deadline.
Ask her to remind you to compare it with the provider's bill, or 30 days before the appeal deadline, and she messages you then with the claim details. She does not log into your health plan, read your mail or decide whether to appeal; she does not give medical or legal advice. You send the paper, and she brings it back when you need it.
Frequently asked questions
Is an EOB a bill?
No. An EOB explains how your plan processed a claim. If you owe money, the provider sends a separate bill, and its amount should match the "you may owe" line on the EOB.
Why is the amount billed so much higher than what I owe?
Because the plan pays only up to the allowed amount, which is the price it agreed for that service. An in-network provider may not bill you for the difference between billed and allowed on covered services.
How long do I have to appeal a denied claim?
Under the federal rules HealthCare.gov describes, you must file an internal appeal within 180 days of receiving the denial notice. Check your own notice for the exact date and process.
How long should I keep EOBs?
At least until you have paid the related bills and any appeal is settled. Many people keep them through the end of the year for tax time and FSA or HSA claims.