Quick Answer: An Explanation of Benefits (EOB) is a statement your health insurer sends after processing a claim, showing the billed amount, what the plan paid, and what you owe. It is not a bill. Your provider will send a separate invoice for any balance due. Use the [medical bill analyzer](/medical-bill-analyzer) to check whether charges on your follow-up bill match your EOB.
EOB vs. Your Actual Bill: Key Differences
The EOB arrives from your insurer; the bill arrives from your provider. Paying the EOB amount before receiving the provider's bill is the most common mistake. The CMS guide to reading your EOB explains each field. If your plan has a deductible or out-of-pocket maximum, the EOB will show how those accumulators updated after the claim.
EOB vs. Provider Bill: 2026 comparison| Feature | EOB | Provider Bill |
|---|
| Who sends it | Your insurer | Your doctor or hospital |
| Is it a bill? | No | Yes |
| What to do | Review and keep for records | Pay the balance due |
| When it arrives | After claim is processed | After provider files claim |
Source: CMS, How to read an explanation of benefits (cms.gov).
Source: https://www.cms.gov/medical-bill-rights/help/guides/explanation-of-benefits
Frequently Asked Questions
Is an EOB a bill I need to pay?
No. An EOB is an informational statement from your insurer, not a payment request. Wait for a separate invoice from your provider before paying anything. Confirm the amount on the provider's bill matches the 'patient responsibility' column on your EOB before writing a check.
What are the main fields on an EOB?
Four fields matter most: Billed Amount (what the provider charged), Allowed Amount (the negotiated rate your insurer accepts), Plan Paid (what the insurer covers), and Patient Responsibility (your share after deductible and [Medicare eligibility](/medicare-eligibility) or plan cost-sharing rules apply).
Does Medicare send an EOB?
Original Medicare (Parts A and B) sends a Medicare Summary Notice (MSN) every 6 months, not an EOB. Medicare Advantage and Part D plans send a true EOB after each claim. Both documents serve the same purpose: showing what was billed, what the program paid, and what you owe.
What should I do if my EOB shows a charge I don't recognize?
Compare the EOB to your [medical bill analyzer](/medical-bill-analyzer) output or your provider's itemized bill. If a charge appears on your EOB but you never received that service, call your insurer to file a claim dispute within 180 days. Check the [Medicaid income limits](/medicaid-income-limits) page if you think you may qualify for additional cost assistance.
