An EOB (explanation of benefits) is a health plan's statement of how it processed a claim: the services billed, the amount the plan allows for each, what the plan paid and what the patient owes. It is not a bill. The patient gets one for each processed claim, and your practice gets the same information as a remittance, usually electronic (an ERA) and sometimes on paper.
For a practice, the EOB matters twice: your billing team posts payments from it, and your patients read theirs and call you with questions.
What is an EOB?
An Explanation of Benefits (EOB) is a statement a health plan sends after it processes a claim. It shows what was billed, what the plan allows for each service, what the plan paid, and what the patient is responsible for. It explains how the claim was processed; the bill itself comes from the provider.
Two documents go by the name. The patient's EOB is mailed or posted on the plan's portal, one per claim. The provider's version, the remittance advice, lists every claim in a payment. Most payers send it electronically as an ERA; those that don't send a paper or PDF remittance, which billing teams also call an EOB.
Purpose of an EOB
An EOB shows, claim by claim:
- Services received: which services the plan processed, and for which dates.
- Claim processing: whether each line was paid as billed, reduced or denied, and why.
- Patient responsibility: the deductible, coinsurance or copay the patient owes.
- Payments made: what the plan paid for each service.
Components of an EOB
Most EOBs carry the same sections:
- Patient information: the patient's name and member ID or policy number.
- Claim number: the payer's reference for the claim, which you quote on any call or appeal.
- Provider information: the provider's name and address.
- Description of services: each service with its CPT or HCPCS code.
- Service dates: the date of each service.
- Allowed amount: the most the plan recognizes for each covered service. The insurer's payment and the patient's share (deductible, copay or coinsurance) together make up this amount.
- Amount paid by insurance: what the plan paid for each service.
- Patient responsibility: the total the patient owes, including deductible, coinsurance and other out-of-pocket costs.
- Contact details: where to call the plan with questions.
- Remarks: notes on the claim, including why a line was denied or reduced. On a provider's remittance these are codes: a group code (CO for a contractual obligation, PR for the patient's share) paired with a claim adjustment reason code (CARC), and sometimes a remark code (RARC) with more detail.
Here is how the figures fit together. For example, if your practice bills $200 for a visit, the plan allows $120, and the patient has met the deductible and owes 20% coinsurance, the plan pays $96, the patient owes $24, and the remaining $80 shows as a contractual adjustment (CO-45: the charge was more than the payer allows). An in-network practice writes that $80 off; it can't bill it to the patient. The allowed amount post explains how that figure is set.
Navigating Your EOB
Whether it is your billing team posting a remittance or a patient reading theirs, the same questions apply. Before you post an EOB, check:
- It is on the right claim. Patient, date of service, claim number and each line match what you billed.
- The allowed amount matches your contract. Compare it with your contracted rate or fee schedule for that code. If it is lower, that is an underpayment to follow up with the payer, not an adjustment to write off.
- Every zero-paid line is worked. A line paid at $0 is a denial. If it is simply posted, nobody works it. Send it to denial management with its reason code.
- The patient's share is posted as the EOB states it. Bill the patient only the PR amounts. A CO amount is never the patient's to pay.
- The payment total matches your bank deposit. If the two don't agree, find out why before the month closes.
- A copy is kept. You will need it for appeals, patient questions and audits.
The common mistakes are the reverse: underpayments adjusted off, denials posted and forgotten, and patients billed for amounts their plan says they don't owe.
When a patient calls about their EOB, the useful answers are short. The EOB is not a bill; your statement is, and it carries the due date. The patient's share on your statement should match the EOB. If the plan denied something the patient thinks is covered, they can appeal to the plan, and your office can often help by correcting and resubmitting or appealing the claim.
How EOBs Impact Patients and Providers
For patients, the EOB shows what their plan covered and what to expect on your bill. When the two match, they have fewer reasons to call or dispute.
For your practice, the EOB is the record of what each payer actually paid. Read across many EOBs, it shows patterns: one payer reducing a code below contract, one reason code that keeps coming back, one provider's claims denied more often. Fixing those causes is how billing problems stop repeating.
Frequently Asked Questions
What does EOB stand for?
EOB stands for Explanation of Benefits.
How often are EOBs sent?
Patients receive an EOB for each claim their plan processes, usually within a few weeks of the visit. Original Medicare works differently: it sends a Medicare Summary Notice every four months covering the services received in that period. Practices receive a remittance with each payment.
Is an EOB the same as a bill?
No. An EOB is a summary of how a claim was processed. A bill, from the provider, says what is owed and when.
Can a claim on an EOB be appealed?
Yes. If a claim was denied incorrectly, the patient or the provider can appeal the decision to the plan.
Should EOBs be kept?
Yes. Keep them for reference, especially for tax purposes, appeals or resolving billing disputes.
How can the codes on an EOB be understood?
The service codes are CPT or HCPCS codes, and the reason codes are standard published lists. A patient can ask the provider's office or the plan to explain a specific code.
What should be done if there's an error on an EOB?
Contact the insurance company to report it. If the error is in what your practice billed, such as a wrong code or date, correct the claim.
What happens if the patient responsibility amount isn't paid?
Unpaid balances may go to collections, which in some cases can affect the patient's credit score.
What is the allowed amount in an EOB?
The allowed amount is the most the plan recognizes for a specific covered service. It includes both what the insurance company pays and the patient's share.
Can EOBs be viewed online?
Many insurance companies offer online portals where patients and providers can view EOBs and remittances.
Where Beeline fits
Beeline's payment posting service posts ERAs and paper EOBs to the claims they pay, checks each payment against what your contract allows, and sends denied lines to be worked. The page's tool, "A remittance, explained", walks through one remittance line by line. To have someone look at your own remittances, book a free consultation.