Health Insurance
EOB (Explanation of Benefits)
An EOB is not a bill — it is an informational document that breaks down how your insurer processed a claim and what portion remains your responsibility.
Last reviewed: May 2026 · Editorial methodology
Definition
An Explanation of Benefits (EOB) is a document sent by your health insurer after a medical claim is processed. It lists the date of service, the provider, the amount billed, the insurer's contracted (allowed) rate, what the insurer paid, and how much you owe based on your deductible, copay, or coinsurance. EOBs are not bills — they are informational notices — but they help you verify that claims were processed correctly and that cost-sharing is accurate. Reviewing EOBs is one of the most effective ways to catch billing errors, fraudulent claims, and duplicate charges. If the EOB shows a denial or unexpected patient responsibility, you have the right to appeal the insurer's decision within the timeframe listed on the document. Medicare issues a similar document called the Medicare Summary Notice (MSN) for Part A and Part B claims. Most insurers now provide EOBs electronically through member portals, often within days of a claim being processed.
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Cover Forge USA Editorial Team
Editorial Lead
This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed 2026-06-14
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