A focused internal audit can uncover under-coding that leaves revenue on the table and over-coding that creates compliance risk. The goal is to compare what was billed with what the documentation supports, and to learn where the gaps come from.
Plan the sample
Select a random sample of encounters from one provider or one service line, covering a single month. Twenty to thirty encounters is enough to reveal patterns. Include both high-volume and high-value services, because errors cluster in both.
Review each encounter
- Confirm the diagnosis codes are supported by the note
- Check that the procedure code matches the documented service and time
- Look for required modifiers and whether they were applied
- Note whether any billable service was documented but not charged
- Record each finding with the encounter ID, the issue, and the expected correction
Turn findings into education
Share results with providers in a neutral way, focused on patterns rather than individuals. A single page that shows the three most common issues, with a short example of each, usually produces more change than a long report. Repeat the audit after a quarter to confirm improvement.
This article is general guidance. Coding rules change, so confirm current requirements with a qualified coding professional or compliance advisor.
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