Explanation of Benefits (EOB): How to Read It (It Is Not a Bill)

The short answer

An Explanation of Benefits (EOB) is a statement from your health insurance plan showing what a provider charged, what the plan allowed and paid, and what you may owe. It is not a bill. Keep it, compare it with any bill that arrives later, and only pay the provider’s bill, never the EOB itself.

Is this letter real?

Most EOBs are exactly what they look like: routine paperwork your health plan sends after a claim is processed. Many plans also post them in your online member account instead of, or in addition to, mailing them.

Still, an EOB is worth a careful look for two reasons:

• It can reveal medical identity theft. The FTC lists “an Explanation of Benefits statement for services you didn’t get” as a warning sign that someone may be using your insurance. If you see a provider, date, or service you do not recognize, take it seriously. See the FTC’s guide to medical identity theft.
• A real EOB never asks you to pay. CMS’s sample EOB is printed with “THIS IS NOT A BILL.” If a document that calls itself an EOB demands payment, gives you a payment link, or pressures you to act today, be suspicious.

To check, use the member services number on your insurance card (not the number on the letter) or log in to your plan’s website directly. Your plan can confirm whether the claim exists.

What the letter says, section by section

Every insurer designs its EOB differently, but CMS’s guide to reading an EOB and its sample EOB show the parts you will usually find.

Header and member details

The top lists the statement date, your name, your member or subscriber ID, your group number (for job-based plans), and the plan’s customer service number. CMS notes the phone number may be near the logo or on the back.

Claim information

• Patient name: who received the care. On a family plan, this may be your spouse or child.
• Provider: the doctor, lab, or facility that sent the claim.
• Claim number: the reference number for this claim. Write it down; you will need it if you call or appeal.
• Payee: the person who will get any reimbursement if the claim was overpaid.

The claim detail table

This is the part that confuses people. Here is what the common columns mean, using the terms in CMS’s sample:

• Date of service: the day you got the care.
• Service description: what was done, such as an office visit, lab test, or screening.
• Claim status: whether the claim was paid, partly paid, or denied.
• Provider charges (billed amount): the provider’s full price.
• Allowed charges (allowed amount): the amount the provider will actually be paid for a covered service. CMS defines the allowed amount as the most your plan will pay for a covered service. CMS also calls it the “negotiated rate.” It can be much lower than the billed amount because in-network providers have a contract with your plan to accept set rates.
• Copay, deductible, coinsurance: your share, split by type. A copay is a set dollar amount. The deductible is what you pay each coverage period before the plan starts paying. Coinsurance is your percentage share of the allowed amount.
• Paid by insurer: what the plan paid the provider.
• What you owe (patient balance): your share after the plan has paid. CMS cautions that the EOB does not show whether you already paid part of this, for example a copay at the front desk.
• Remark code: a short code that explains a payment decision. Its meaning is printed elsewhere on the EOB, often just below the claim table or on the back. In CMS’s sample, the code PDC means the billed amount was higher than the most the plan allows.

Deductible and out-of-pocket tracking

Many EOBs include a summary of how much you have paid toward your deductible and your out-of-pocket limit this year. The out-of-pocket limit is the most you pay for your share of covered care in a coverage period (premiums do not count toward it). Not every EOB shows this, and the layout varies by plan.

Appeal rights

If any part of the claim was denied, the EOB or a separate notice should explain why and how to appeal. Look for a section titled something like “Your appeal rights” or “If you disagree.” Deadlines vary, so check the date printed on your own notice. For most plans covered by the Affordable Care Act, HealthCare.gov says you have 180 days (6 months) from receiving the denial notice to file an internal appeal. If the plan still says no, you can usually ask for an external review by an independent reviewer within 4 months. Medicare, Medicaid, and some older “grandfathered” plans follow different rules, so go by the deadline on your notice.

What to do next

1. Do not pay from the EOB. The Texas Department of Insurance puts it simply: a bill comes from your medical provider, not your health plan. If you owe nothing, you may never get a bill.
2. Check that you recognize everything. Patient, provider, date, and service. If something is wrong, call your plan using the number on your insurance card.
3. Hold on to it until the bill arrives. The provider’s bill can take a while to show up.
4. Compare the bill to the “what you owe” amount. CMS says your bill should not be higher than the patient balance on the EOB. If it is, call the provider’s billing office and ask why. Mention any amount you already paid.
5. Look closely at denials. If a service was denied, read the remark code and reason. Some denials are simple fixes, such as a coding error the provider can correct and resubmit. Others need a formal appeal. Our guide to an insurance claim denial letter walks through that.
6. Check out-of-network charges. If you got emergency care, air ambulance care, or care from an out-of-network doctor at an in-network hospital or surgery center, the No Surprises Act generally limits what you pay to in-network cost sharing for plans it covers. For non-emergency care, you can give up this protection by signing a notice and consent form. If the EOB shows out-of-network cost sharing anyway, ask your plan or call the No Surprises Help Desk (below).
7. File it. Keep EOBs at least until every related bill is settled.

If you do nothing, usually nothing happens: the EOB is informational. The risk is missing an error, an appeal deadline on a denial, or a sign of identity theft.

Common mistakes

• Paying the EOB. It is not a bill, and your plan is not asking you to pay it.
• Paying the provider’s full “billed amount.” If you have insurance and used an in-network provider, your share is based on the allowed amount, not the billed amount.
• Paying a bill before the EOB arrives. Without the EOB, you cannot tell whether the bill reflects your insurance. If the bill arrives first, you can ask the provider to wait or confirm the claim was processed.
• Ignoring a denial. Appeal windows are limited. Read the deadline on your notice.
• Forgetting front desk payments. The EOB may not subtract a copay you already paid.

Where to get free help

• Your health plan’s member services: the number on your insurance card.
• Your state’s Consumer Assistance Program: many states run programs that help with insurance problems and appeals. Find yours on the CMS Consumer Assistance Programs map. Under federal rules, denial notices from most plans must list this contact if one applies to you.
• Your state department of insurance: handles complaints about insurers in your state.
• Employee Benefits Security Administration (EBSA): if your job-based plan is self-funded (your employer pays claims itself), state insurance laws generally do not apply, per the Department of Labor. Ask the EBSA benefits advisors instead, at 1-866-444-3272. Your plan documents say whether the plan is self-funded.
• No Surprises Help Desk: 1-800-985-3059 for surprise billing questions, per CMS.
• Medicare members: if you have Original Medicare, you get a different statement called a Medicare Summary Notice. Medicare Advantage and Part D drug plans send their own EOBs, per Medicare.gov.

How Plainly helps

An EOB looks like a bill, uses insurance jargon, and lists amounts in columns that are hard to follow. Plainly turns it into plain English, quickly. Take a photo of each page of your EOB (up to five pages) and Plainly tells you:

• What it is: which visit or service it covers, and whether it is a bill (usually it is not).
• What it wants from you: often nothing, and Plainly will say so.
• Your deadline and how urgent it is: any deadlines, such as an appeal window.
• The numbers that matter: what was billed, what your plan paid, and what you may owe the provider.
• Anything that looks off: possible scam signals worth checking before you pay or call anyone.
• What it could not read: parts of your photo that were not clear, so you know what to double-check.

You can listen to the explanation read aloud, share it with someone who helps you, and find it later in My Scans on your device. It works on the web, iOS, and Android, needs no account, and Plainly does not store your photos.

Plainly reads what your EOB says. It cannot tell you whether your plan applied its rules correctly or whether a denial will hold up on appeal.

Plainly can make mistakes, so check dates and amounts against your EOB before you act.

Scan your EOB with Plainly

Frequently asked questions

Is an Explanation of Benefits a bill?

No. An EOB is your health plan’s summary of how a claim was processed. Bills come from your provider. Wait for the provider’s bill and compare it to the “what you owe” amount on the EOB.

Why is the allowed amount lower than what my doctor charged?

In-network providers agree to accept a negotiated rate from your plan. The allowed amount is that rate. In-network providers generally cannot bill you for the difference on covered services.

What if my bill is higher than what the EOB says I owe?

CMS says your bill should not be higher than the patient balance on the EOB. Call the provider’s billing office, have your EOB and claim number ready, and ask them to explain or correct the difference.

What if I do not recognize a service on my EOB?

Call your health plan using the number on your insurance card. It could be a billing error or a sign of medical identity theft. The FTC’s medical identity theft guide explains the next steps.

How long should I keep my EOBs?

At least until every bill related to that care is resolved and any appeal is finished. Some people keep them longer for tax or health savings account records.

Plainly explains documents in plain language. It is not legal, tax, medical, or financial advice. Always check important dates, amounts, and contact details against the original letter.