Reading Your Explanation of Benefits: What Each Section Is Actually Telling You

EOBs arrive by mail or through your insurer's online member portal, typically within a few weeks of a claim being processed. Log in to your insurer's website or app and navigate to the claims or EOB section. If you receive paper statements, check that the date of service and your member ID match the care you received.

The top section of every EOB includes your name, member ID, group number, the provider's name, and the date of service. Verify each field. An incorrect member ID or provider name can indicate a claim was applied to the wrong account — a surprisingly common error that affects your cost-sharing totals.

Most EOBs present four key dollar figures in a table:

• Billed amount: What the provider charged before any insurance adjustments.
• Allowed amount (or negotiated rate): The maximum your insurer will recognize for that service, based on its contract with in-network providers. This is typically lower than the billed amount.
• Plan paid: The portion your insurer actually pays after applying your deductible, copay, or coinsurance.
• Your responsibility: What you owe the provider after the insurer's payment.

The gap between the billed amount and the allowed amount is a contractual adjustment — in-network providers agree to write it off. You are never responsible for that difference when using in-network care. For a deeper look at how cost-sharing terms interact, see how deductibles, copays, and coinsurance each work.

Your EOB will indicate whether each service was processed as in-network or out-of-network. This single designation can significantly change your financial responsibility. Out-of-network claims typically face a higher deductible, a higher coinsurance percentage, and — unlike in-network claims — may expose you to balance billing, where the provider bills you for the difference above the allowed amount. If a service you believe was in-network is coded as out-of-network, call your insurer immediately. Understand how network tiers affect your costs before assuming the EOB is correct.

Every EOB includes alphanumeric reason or remark codes explaining why a claim was paid, reduced, or denied. These codes are listed in a legend, usually at the bottom of the document or in an accompanying key. Common examples include codes indicating a service requires prior authorization, that a deductible was applied, or that a service is not covered under your plan. Do not ignore these codes — they tell you the exact basis for any reduction, which you need to know if you plan to appeal.

Once you receive a bill from your provider, place it side by side with the EOB for the same service date. Confirm that the procedure codes (CPT codes), dates of service, and the amount listed as your responsibility match. If the provider is billing you for more than the EOB shows as your responsibility, contact the provider's billing department and reference your EOB before paying. Errors in medical billing are common and often correctable.

Each EOB typically includes a running total showing how much of your deductible and out-of-pocket maximum you have met for the plan year. Review these figures across all your EOBs to understand where you stand. Once you reach your out-of-pocket maximum, your insurer generally covers 100% of covered in-network services for the remainder of the plan year. For a full explanation of these foundational terms, see our complete health insurance guide.