Up to 80% of medical bills contain errors: duplicate charges, services never rendered, inflated codes. Most people never notice and just pay. Don't.
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Do you have an itemized bill?
Most providers send a "summary" bill. An itemized bill lists every charge line-by-line — and is required by law upon request.
Why this matters:
Summary bills hide individual charges, making it nearly impossible to spot errors. Always request an itemized bill before reviewing anything else. Providers are required to provide one.
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Do you see the same charge listed more than once?
Duplicate charges happen when the same service, medication, or supply is billed two or more times on the same bill.
What to look for:
Scan for identical line items — same description, same code, same date. Common duplicates include room & board fees, routine medications (e.g., aspirin, IV saline), and lab tests that were run once but billed twice.
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Are you billed for services you don't remember receiving?
It sounds obvious, but charges for tests, consultations, or procedures you never had are one of the most common billing errors.
What to look for:
Go line by line and ask: "Did this happen?" Watch for specialist consultations (a doctor may have reviewed your chart without you meeting them), physical therapy sessions, extra imaging runs, or supplies you don't recognize. Cross-reference with any discharge paperwork.
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Does the billing code description match what actually happened?
Upcoding means billing for a more expensive procedure or visit level than what actually occurred. It can be accidental or intentional.
What to look for:
Each charge has a CPT or ICD code next to it. Look up any code you don't recognize at cms.gov or ask your doctor's office what code they submitted. A "Level 5" office visit (99215) is the most complex — if your parent had a routine checkup billed as Level 5, that's a red flag.
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Are services being billed separately that should be one charge?
Unbundling means splitting a procedure into separate billable components — each charged individually — when they should be billed as one package at a lower rate.
What to look for:
Common examples: a surgery billed with the anesthesia, incision, and closure as separate line items (these are typically included in a single surgical code). Or a blood panel broken into individual tests rather than the standard panel code. If you see many individual small charges for something that sounds like one event, it may be unbundled.
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Is your personal and insurance information correct?
Wrong patient info causes claims to be rejected or processed incorrectly — and the cost often lands on you.
What to verify:
Full legal name and date of birth, insurance ID number, group number, plan name, and dates of coverage. Also check whether in-network vs. out-of-network is applied correctly. Even a one-digit error in an insurance ID can result in a denied claim being sent directly to you.
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Are you being charged more than your insurance's allowed amount?
Balance billing happens when a provider charges you the difference between their fee and what your insurance pays — which may be illegal for in-network providers.
What to look for:
Call your insurer and ask for the "Explanation of Benefits" (EOB) for this claim. The EOB shows what your insurance paid and what your responsibility should be. If the bill you received is higher than the EOB says you owe, that's balance billing. For in-network providers, this is often not allowed under the No Surprises Act (2022).
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Disclaimer: The results provided by this tool are for general informational and guidance purposes only. They do not constitute medical, legal, financial, or professional billing advice and should not be relied upon as such. CareNest makes no guarantee that all errors in your bill have been identified. Always consult a qualified healthcare billing advocate, patient advocate, attorney, or financial advisor before disputing charges or taking any action based on these results.