An Explanation of Benefits is the form your insurance company sends after you (or someone on your plan) sees a doctor, fills a prescription, or gets a procedure. It's not a bill. It's the carrier's accounting of what happened with the claim — what got submitted, what got paid, what's still owed, and to whom.
And it is one of the most consistently confusing documents in American consumer life. Roughly half the EOBs I review with clients contain at least one number they can't explain. About a third contain a number the carrier itself can't easily explain on a first phone call.
The reason is structural. Healthcare pricing operates on at least three different price lists for any given service — the doctor's chargemaster price, the carrier's negotiated allowed amount, and your share of that allowed amount. The EOB shows all of them. Only one of them is the price you actually have to think about. Let's walk through which.
Here's a real EOB (anonymized)
This is from a routine in-network doctor visit — a specialist consultation with a $200 specialist copay plan. Patient is on an employer-sponsored Cigna PPO. Numbers are real; provider and patient names changed.
| Line | What it says | The number |
|---|---|---|
| ① | Billed Amount | $485.00 |
| ② | Plan Discount (Negotiated Savings) | −$237.50 |
| ③ | Allowed Amount | $247.50 |
| ④ | Plan Paid | $47.50 |
| ⑤ | You Owe (Member Responsibility) | $200.00 |
Most people look at this form and react to the wrong number. They either fixate on the $485 (panic) or the $237.50 negotiated discount (relief). Both are emotional reactions to information that doesn't actually affect them.
Let me decode each line. Then I'll tell you which one is the only one that matters.
Line by line
Line 1Billed Amount · $485.00
This is the provider's "chargemaster" price — the dollar figure the doctor's office would charge if you walked in with no insurance and paid cash. It is mostly fiction. Almost nobody actually pays this. It exists for accounting purposes, for negotiation with carriers, and for the rare uninsured patient. The number is designed to be high so that any contracted discount looks generous.
What to do with it: Ignore it. It is not your bill. It will never be your bill. Don't compare across providers using this number — it tells you nothing about what you'll actually pay.
Line 2Plan Discount · −$237.50
This is the difference between the chargemaster price and what the carrier has negotiated to pay the provider. Carriers love to highlight this number because it makes them look like they're saving you money. They're not saving you anything you would have paid. They're showing you the difference between two prices, only one of which is real.
What to do with it: Ignore it. The "savings" is conceptual. You weren't going to pay the chargemaster anyway. The carrier is marketing.
Line 3Allowed Amount · $247.50
This is the carrier's negotiated rate for the service. It's the "real" price — what the provider will actually receive in total. Out of this $247.50, some portion comes from the carrier (line 4) and some from you (line 5). This is the number that matters for understanding the economics. If you're shopping providers or appealing a claim, this is the line to focus on.
What to do with it: If you're trying to verify the claim was priced correctly, compare this against the contracted rate for the CPT code (the procedure code). If it's wildly off, the provider may have billed incorrectly. Most appeals start here.
Line 4Plan Paid · $47.50
The portion the carrier pays directly to the provider. In this example, it's small ($47.50) because the patient has a $200 specialist copay — meaning the patient bears the bulk of the allowed amount up to the copay limit, and the plan covers the rest. This number tells you nothing on its own. It only makes sense in conjunction with your plan design.
What to do with it: Compare against your plan summary. If your plan has a 20% coinsurance and the math here doesn't match (20% of $247.50 = $49.50), there may be a deductible application or a copay structure at play. Worth a phone call if the numbers don't match your expectations.
Line 5 · The only one that mattersYou Owe · $200.00
This is your bill. The provider's billing office will send you (or already has sent you) a separate statement for exactly this amount. It may be your copay, your deductible application, your coinsurance share, or some combination. If this number is wrong, that's where to focus. If this number is right, the other four numbers don't matter to your wallet.
What to do with it: Verify against your plan's copay structure (specialist copay = $200 ✓ in this case). If it includes deductible application, verify against your YTD deductible accumulator. If it's not what you expected, call the carrier — but bring this EOB and your plan summary.
"The EOB is a four-line accounting document with one line that matters. Spend your attention there. Everything else is the show."
Common EOB errors I see weekly
Three things are wrong more often than you'd think:
1. The wrong allowed amount
Sometimes the provider bills a CPT code (procedure code) that doesn't match what they actually did. The carrier prices it at the contracted rate for the billed code — which may be different from what should have been billed. If line 3 looks high relative to what you remember the visit being, ask for an itemized bill from the provider and compare codes.
2. Deductible misapplied
You hit your deductible in February. In March, a claim comes back showing you owe $1,800 (deductible-priced) when you should owe $200 (post-deductible copay). The carrier's accounting system didn't update your accumulator. This happens monthly, in my experience. The fix is a 15-minute phone call where you cite the date your deductible was met.
3. Out-of-network billing for in-network services
You went to an in-network hospital for an in-network procedure. But the anesthesiologist who happened to be on call that day was out-of-network. They bill at their full rate, get a much lower allowed amount, and the difference may end up on your EOB as out-of-network coinsurance. The No Surprises Act (2022) limits this in many situations — but you have to ask for the protection.
// Federal law as of 2022 — providers in most "ancillary" situations (emergency care, anesthesia at an in-network facility, radiology, pathology) cannot balance-bill you out-of-network rates. If you get an EOB showing out-of-network charges for something that happened at an in-network facility, file a complaint with the No Surprises Help Desk (cms.gov/nosurprises) and dispute the bill. Most providers back down within 30 days of receiving a formal NSA dispute notice.
The 60-second EOB scan
When an EOB lands in your mailbox or patient portal, here's the workflow:
- Look at line 5 — "You Owe." Does it match what you expected based on your plan design?
- If yes: file the EOB. Done. You'll get a bill from the provider for that exact amount.
- If no: look at line 3 — "Allowed Amount." Is the procedure code correct? Is the rate consistent with what you expected?
- If both lines 3 and 5 look wrong, call the carrier. Bring your plan summary and the date the service was rendered.
- If you're billed by the provider for more than what line 5 says, that's the provider's billing error — call them, not the carrier. (Yes, this happens.)
EOBs are accounting documents that show you four numbers you don't need to think about and one number you do. The Billed Amount is theater. The Plan Discount is marketing. The Allowed Amount is the economics. The Plan Paid is downstream of your plan design. Only You Owe affects your wallet — focus there.
Next week we get into the meat of why renewals are spiking in 2026 — and the structural alternative most small employers never get quoted on. Subscribe if you want it.