Why Your Explanation of Benefits Isn't a Bill — and How to Read It

Your insurer sends an EOB after every processed claim — by mail, email, or through an online member portal. Log in to your insurer's website or app, navigate to the claims or EOB section, and pull up the document that matches your recent visit or service.

Every EOB breaks a claim into several figures. Learn what each one means:

• Billed amount: What your provider charged before any adjustments.
• Allowed amount (or negotiated rate): The maximum your insurer has agreed to pay for that service with in-network providers. The difference between billed and allowed is typically written off by the provider.
• Plan paid: The portion your insurer actually paid after applying your deductible, copay, or coinsurance rules.
• Your responsibility: The amount you owe the provider — this is the only number you should pay.

For a deeper look at how these cost-sharing amounts interact, see Deductible, Copay, or Coinsurance — Which Cost Are You Actually Paying?.

EOBs include a status field for each service line — typically processed, denied, or pending. Denied lines carry a reason code or brief explanation (e.g., "service not covered," "prior authorization required"). Note any codes that apply to your claim and look them up in the explanation key, which is usually printed at the bottom of the EOB or available on the insurer's website.

Your EOB will usually indicate whether each provider was in-network or out-of-network. Out-of-network services are often subject to a separate (higher) deductible and lower plan coverage. If a provider you believed was in-network is listed as out-of-network, contact your insurer immediately — billing errors in network status do occur. Understanding the financial stakes of network tiers is covered in What 'In-Network' and 'Out-of-Network' Really Mean for Your Bills.

When your actual bill arrives from the doctor or hospital, place it next to the EOB. The "your responsibility" amount on the EOB and the amount due on the provider bill should match. If they don't, contact your provider's billing department first — they may have sent the bill before receiving the insurer's payment. If the discrepancy persists, call your insurer. For common billing surprises, see Gaps That Catch People Off Guard When a Medical Bill Arrives.

If you believe a claim was incorrectly denied or a covered service was underpaid, you have the right to appeal. Start with an internal appeal to your insurer — submit a written request, include supporting documents (the EOB, the provider's bill, any referral or prior authorization paperwork), and keep copies of everything. If the internal appeal fails, you may be entitled to an external review by an independent organization under federal law.