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.

Where this term matters

Health Insurance →Medicare →

Tip

Glossary definitions are educational. Always check your own policy language — insurers can define common terms differently from one another. When in doubt, request a written explanation from your agent.

Related terms

CoinsuranceYour percentage share of a covered cost after the deductible — common in health and some property policies.CopayA fixed dollar amount you pay for a specific covered health service (e.g. $30 for a doctor visit).Prior AuthorizationPrior authorization is an insurer's cost-control mechanism that can delay care if approval is not obtained in advance.Balance BillingBalance billing can result in unexpected medical bills, particularly when receiving care from out-of-network providers or facilities.Out-of-Pocket MaximumOnce you hit your out-of-pocket maximum, your insurer pays all covered in-network claims for the rest of the plan year — protecting you from catastrophic medical debt.

Related guides

Source: Cover Forge USA editorial team|Last verified: May 2026|Methodology
Definitions are educational and may be simplified. Always refer to your policy contract and consult a licensed agent for terms that affect coverage decisions.
CF

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 June 2026

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