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Why Doesn't My Hospital Bill Match What Insurance Paid?

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Why the two numbers look different

Your hospital bill and your insurance company's Explanation of Benefits (EOB) are two different documents. The bill shows what the hospital charged. The EOB shows what your insurer decided to pay and what it says you owe. The gap between the two is usually made up of adjustments and your deductible, copay or coinsurance — not a mistake by itself. This is not legal or medical advice.

The words on the paper, explained

• CPT/procedure code — the number for a specific service. The description on your bill tells you what it says that service was.
• Allowed amount — the amount your insurer agreed the service is worth, usually lower than the charge.
• Adjustment — the difference between the charge and the allowed amount, written off by agreement between the provider and the insurer.
• Deductible — what you pay first, before insurance starts paying its share.
• Copay — a flat amount you owe for a visit or service.
• Coinsurance — a percentage of the allowed amount you owe once the deductible is met.
• EOB — the Explanation of Benefits, the insurer's own statement of what it paid and what it says you owe.

When the math doesn't add up

Line up the bill and the EOB. Charges minus adjustments minus what insurance paid should equal what you owe. If those specific lines don't add up, that is worth questioning — don't pay yet. Ask the biller for an itemized, corrected bill before you send any money.

If you have insurance and this was emergency or out-of-network care

If this bill is for emergency care or certain out-of-network ancillary care, the federal No Surprises Act may protect you from most balance billing. Call your insurer first, using the number on your insurance card. See CMS — No Surprises Act for what it covers.

If money is tight, or you're uninsured

Hospitals are expected to have a Financial Assistance Policy. Ask for the Financial Assistance Policy and application. If you're uninsured, you also have a right to a Good Faith Estimate by name. For a full hospital-specific walkthrough, the sibling tool Medical Bill Reducer exists. To see what similar care typically costs in Florida, check Florida Health Price Finder.

What to do next

This page can't read your specific numbers. The free tool at What's This Bill? does — paste your bill or EOB and get each line explained in plain words, with the ones worth questioning flagged and the exact question to ask. Nothing you paste is stored. This is not legal, medical or insurance advice — confirm anything important with the biller or your insurer, in writing.

What's This Bill? explains a bill in plain language; it can be wrong, and it is not legal, medical or insurance advice. It never decides that a charge is improper — it gives you the question to ask. Rights referenced are federal rules as published (CMS, CFPB). Nothing you paste is stored.