A bill that feels too high isn't proof something is wrong, but it's a good reason to check before you pay. Here's the order that finds problems fastest.
1. Get the itemized bill, not just the summary statement
The one-page balance you got in the mail almost never shows individual charges. Call the billing office and ask for the itemized bill — every code, charge, and date listed separately. Providers are required to give you this on request.
2. Compare it to your Explanation of Benefits (EOB)
Your insurer's EOB shows what was billed, what insurance covered, and what you owe. Line up the itemized bill against the EOB. Mismatches here — charges on one that aren't on the other, or a "your responsibility" number that doesn't match — are one of the most common sources of billing errors.
3. Look for duplicate or unbundled charges
Scan for the same service billed twice, or a single procedure broken into multiple line items that should have been billed as one bundled code. Both inflate the total without you receiving any extra care.
4. Check the network status of every provider involved
A hospital being in-network doesn't guarantee every doctor who touched your case was. Anesthesiologists, radiologists, and pathologists are frequently billed separately and sometimes out-of-network even at an in-network facility.
5. Check whether your patient-responsibility math actually adds up
Deductible + coinsurance + copay should equal what you're being asked to pay, given your plan's terms. If it doesn't, ask your insurer to explain the calculation in writing.
If something doesn't add up
Write down what you found — which charge, which document, why it looks wrong — before you call anyone. A specific question ("why is CPT 99285 billed twice on the same date?") gets a faster, more useful answer than a general complaint that the bill "seems high."
If you'd rather have someone else do this comparison for you, that's exactly what a RomiCare medical bill review does.