What is Undercoding?
Also called: under-coding · leaving money on the table
It is usually defensive. A provider who has been audited once tends to down-shift permanently, and a practice with no coding review has no mechanism to notice.
It is found by comparing a provider's E/M level distribution against specialty benchmarks and then auditing the outliers against the actual notes. A distribution weighted heavily toward level 3 in a specialty that benchmarks toward level 4 is worth reading charts over.
Where Vizora handles this
Primary sources
Where "Undercoding" is defined by the bodies that set the rules, rather than by us.
- Evaluation and Management services guide (opens in a new tab)
Centers for Medicare & Medicaid Services — How E/M level is determined under the current medical decision making and time rules. The reference for any dispute about whether documentation supports a level.
- OIG compliance program guidance (opens in a new tab)
HHS Office of Inspector General — What a defensible billing compliance program looks like, including guidance written specifically for individual and small group physician practices.
Last reviewed August 20, 2026
Related terms
Upcoding
Upcoding is billing a higher-paying code than the documented service supports. It is a False Claims Act exposure regardless of intent, and it is detected statistically — payers profile a provider's code distribution against peers in the same specialty, so a skewed pattern surfaces without any single claim being reviewed.
E/M Coding
Evaluation and management coding assigns a level of service to a patient encounter based on either medical decision making or total time spent on the date of the encounter. Since the 2021 guideline revision, history and exam no longer determine the level for office visits.
Charge Capture
Charge capture is the process of recording every billable service a provider delivered so it reaches a claim. Services documented in the chart but never converted into a charge are revenue lost permanently — no denial appears, no report flags it, and nothing prompts anyone to look.
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