What is an Explanation of Benefits
An Explanation of Benefits (EOB) is a statement from your health insurer showing what services were billed, what the insurer paid, what was adjusted, and what you owe — it is not a bill.
An Explanation of Benefits (EOB) is a document sent by your health insurance company after you receive medical care. It summarizes how your claim was processed, showing the breakdown of charges, insurance payments, adjustments, and your remaining balance. An EOB is not a bill — it's a record and accounting of what happened with your claim.
Understanding your EOB is essential for catching billing errors, understanding your benefits, and verifying that claims were processed correctly under your plan.
What an EOB Includes
A typical EOB contains:
| Field | What It Means |
|---|---|
| Provider | The doctor, hospital, or facility that billed |
| Date of service | When you received care |
| Procedure codes | The CPT codes describing what services were performed |
| Billed amount | What the provider charged |
| Allowed amount | The negotiated rate your insurer has with in-network providers |
| Adjustment | The discount from the billed amount (you don't owe this) |
| Plan paid | What your insurance company paid |
| Your responsibility | What you owe: deductible, copay, or coinsurance portions |
| Applied to deductible | Portion counting toward your deductible |
How to Read an EOB (Step by Step)
- Confirm the service was yours. Check dates of service, provider name, and procedure descriptions. Fraud and billing errors do happen.
- Check the allowed amount vs. billed amount. In-network providers accept the allowed amount as full payment — the difference is written off. If the billed amount equals the allowed amount, the provider may be out-of-network.
- Verify your deductible calculation. The EOB should show how much of the bill counted toward your deductible and your updated deductible total.
- Confirm the "plan paid" amount. This is what your insurer sent the provider.
- Check "your responsibility." This is the amount you owe. Wait for the actual bill from the provider — it should match this figure.
EOB Errors Are Common
Studies suggest medical billing errors affect a significant percentage of claims. Common issues include:
- Services billed but not received
- Duplicate billing for the same service
- Incorrect procedure or diagnosis codes (which affect coverage and pricing)
- In-network provider incorrectly billed as out-of-network
- Prior authorization denied post-service when authorization was given
If something looks wrong, call your insurer's member services line and reference the claim number on the EOB.
EOB vs. Bill
Many people confuse an EOB with a medical bill. The distinction:
- EOB: From your insurer. Shows how the claim was processed. Not a bill.
- Bill/Statement: From the provider (doctor or hospital). Shows what you actually owe them.
The two documents should align. If the bill from your provider is higher than the "your responsibility" amount on your EOB, contact the provider's billing office — they may have not yet processed the insurance payment, or there could be a billing discrepancy.
Keeping Your EOBs
Store EOBs for at least one year, or longer for major medical events. They're useful for disputing bills, verifying your deductible progress, tax purposes (if deducting medical expenses), and legal matters.