Medical billing in the United States is extraordinarily complex. Each procedure has a CPT code, each diagnosis has an ICD-10 code, and each insurer has its own rules about what it covers and at what rate. The result is a system with enormous potential for error — and patients almost always bear the cost when mistakes go undetected.
Here are the most common medical billing errors, how they happen, and how to identify them on your bill.
The 8 Most Common Medical Billing Errors
Duplicate Charges
The same service or supply billed more than once. Easy to spot on an itemized bill — look for identical line items.
Upcoding
Billing for a more complex or expensive procedure than was actually performed. Requires comparing the code to your medical records.
Unbundling
Billing separately for procedures that should be grouped under one bundled CPT code — inflating the total charge.
Phantom Charges
Charges for supplies, medications, or services that were never actually used or administered during your visit.
Balance Billing
Being billed for the difference between what your insurer paid and the provider's full rate — which may violate your plan terms.
Wrong Quantity
Billing for more units of a medication, supply, or service than were actually used. Common with IV medications and surgical supplies.
Incorrect Codes
Wrong CPT or ICD-10 codes that result in claim denials, wrong pricing, or coverage that doesn't match your actual diagnosis.
Excessive Pricing
Charges that far exceed the Medicare rate or regional fair-market price for the same procedure — especially common for common supplies.
How to Find Errors on Your Medical Bill
Most patients only receive a summary bill — a single line showing the total amount due. This is not sufficient to identify errors. You need an itemized bill with CPT codes. Here's how to get one and use it:
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Request the itemized billCall the billing department and specifically ask for an itemized statement with CPT and ICD codes. You are legally entitled to this document. Some providers will send it automatically; others require a written request.
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Get your Explanation of BenefitsYour EOB from your insurer shows what was billed, what the insurer paid, and what you owe. Compare it line-by-line with the itemized bill. Discrepancies between the two documents are a strong indicator of an error.
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Look up each CPT codeCPT codes (like 99213 for an office visit) describe the exact service billed. Look up any unfamiliar codes online and compare them to what you recall about your visit. If you don't recognise a service, it may be a phantom charge.
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Scan with Bill ReclaimPhotograph your bill and let Bill Reclaim's AI scan it against a database of billing codes and regional pricing benchmarks. The app flags errors by type, estimates your potential savings, and generates dispute scripts for each finding.
Incorrect vs. Fraudulent Medical Billing
Most billing errors are mistakes — the result of coder error, software issues, or miscommunication between departments. However, some errors are intentional. Systematic upcoding, phantom charges across many patients, or deliberate unbundling can constitute healthcare fraud.
If you suspect intentional fraud rather than an honest mistake, you can report it to the Office of Inspector General (OIG) at the US Department of Health and Human Services. Whistleblower provisions may entitle you to a portion of any government recovery.
Key stat: The US Government Accountability Office estimates that billing errors and fraud cost the Medicare program alone over $60 billion per year. Individual patients are equally vulnerable — often more so, because they lack the data systems that government payers use to detect anomalies.
What to Do After Finding an Error
Once you've identified a billing error, act quickly. Read our guide on how to dispute a medical bill for the complete process. In summary:
- Contact the billing department and notify them of the specific error
- Send a written dispute letter via certified mail
- Ask them to place your account on hold during the review
- Request a corrected itemized bill once the error is resolved
- Follow up if you don't hear back within 30 days