What is upcoding on a medical bill?
Last reviewed 2026-07-15
Upcoding is when a bill uses a code for a more expensive or more severe service than the care you actually received. Because the code drives the price, an inflated code inflates the charge. Comparing the codes on your itemized bill to what happened in your visit can reveal a mismatch.
Every service on a medical bill is tied to a code, and codes carry different prices depending on complexity or severity. Upcoding means selecting a higher-paying code than the documentation supports — for example, billing a longer, more complex office visit than the one that took place.
You can check for it by requesting an itemized bill and, where available, your medical records, then comparing the billed codes against the level of care described. A code that assumes more time, severity, or resources than you received is worth asking about.
A 2021 HHS Office of Inspector General report found that Medicare inpatient hospital stays billed at the highest severity level rose nearly 20% from 2014 to 2019 and made up nearly half of all Medicare spending on inpatient stays.
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