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January 17, 2026 · 6 min read
Common Medical Billing Errors: How to Audit Your Hospital Bill
Learn to spot duplicate charges, upcoding, unbundling, and other billing errors that inflate your medical bills by thousands of dollars.
Why you need to audit your medical bill
Medical billing errors are shockingly common. Studies estimate that 30-80% of medical bills contain mistakes. These errors almost always favor the hospital, not you.
An itemized bill review can save you hundreds or thousands of dollars. But you need to know what to look for.
Duplicate charges
One of the most common errors is being charged twice for the same service. Look for identical CPT codes appearing multiple times when you only received the service once.
Example: Being charged for two CT scans when you only had one.
Upcoding
Upcoding occurs when a provider bills for a more expensive service than what was actually performed. This is technically fraud, but it happens regularly.
- Office visits: Charged 99215 (complex visit) instead of 99213 (moderate visit).
- ER visits: Charged 99285 (critical) instead of 99283 (moderate).
- Procedures: Billed for a more complex version of the procedure.
Unbundling
Some services should be billed together at a lower rate. Unbundling is when providers bill each component separately to charge more.
Example: Lab tests that should be billed as a panel are billed individually, costing you more.
Other common errors
Beyond the major categories, watch for these issues:
- Operating room time overbilling (rounded up excessively).
- Charges for canceled procedures or tests.
- Wrong patient information leading to insurance issues.
- Balance billing for services that should be covered.
Let us audit your medical bill
Upload your itemized statement and we will identify potential billing errors and overcharges.