Investigating an overpayment-rate breach
Unit of analysis: claims adjuster × month
July 2025–July 2026 · July data through the 19th
Why did the overpayment rate exceed target, and where should we investigate first?
How the agent investigates
Check the metrics
Compare the 5.66% overpayment rate with the 4% target, alongside the supporting metrics.
Compare like with like
Examine adjuster-month differences using peers in the same center and period.
Separate review targets
Distinguish 22 recurring outliers from ADJ0177’s two high-value cases.
Prepare the report
Set out the priorities for recurrence reviews and case audits, with evidence and open questions.
What the analysis found
Recurring outliers and individual audits need different reviews.
Across 130 outlier-months, 22 adjusters appeared at least twice. Four are active in July-to-date data and warrant priority review. High-value individual cases are examined separately.
Two cases account for most of ADJ0177’s overpayments.
For ADJ0177, KRW 225m of KRW 234m (96%) is concentrated in two CT and MRI cases. Review the source records for possible base-amount entry errors, unapplied coverage limits, or mistaken payments. Concentration alone does not establish misconduct or a cause. Audit findings and recoverability require separate decisions.
What changed?
- Overpayment rate
- 5.66%Target ≤4% · ▲4.2% vs. prior month
- Average processing time
- 3.86daysTarget ≤5 days · ▲29.5% vs. prior month
- Review reversal rate
- 49.5%▲17.4% vs. prior month
Loss ratio 6.92% · target ≤40%Anomaly ratio 10.56%Non-covered service share 43.90%Overpayment amount: KRW 422.94m
The overpayment rate is the metric exceeding its stated target. Processing time and the review reversal rate are also presented at their highest levels in the example, warranting investigation of a possible link between backlog and review quality. July is incomplete; confirm comparisons with closed months after the data is finalized.
How broad is the exposure?
- Outlier-months
- 130Adjuster × month · January–July · rate >10% and overpayment >KRW 5m
- Repeat outliers · at least twice
- 22adjustersCandidates for a review watchlist
- ADJ0177 · two June cases
- KRW 225m of KRW 234m (96%)Review individual cases separately from recurring behavior
Top 12 on the watchlist
- Recurring in July to date
- Earlier recurrence
Cumulative overpayments (KRW) · two occurrences each
Prioritize ADJ0123, ADJ0139, ADJ0042, and ADJ0091 for July-to-date review. ADJ0199 is the only three-time repeat outlier, appearing in February, April, and June—an alternating-month pattern that a consecutive-month rule would miss.
Which individual cases warrant an audit?
| Item × provider category | Overpayment (KRW 10,000) | Flagged / cell total | Share |
|---|---|---|---|
| CT × hospital | 11,381 | 1 of 1 | 48.5% |
| MRI × hospital | 11,099 | 1 of 3 | 47.3% |
| Manual therapy × tertiary institution | 552 | 1 of 1 | 2.4% |
| Manual therapy × clinic | 386 | 1 of 3 | 1.6% |
| Shockwave therapy × clinic | 29 | 1 of 2 | 0.1% |
Shares retain the rounded values from the supplied table. Counts show flagged cases out of all cases in the same item/provider-category cell. On a small screen, scroll the table horizontally.
What still needs checking?
Rerun the watchlist after July closes. Adjustments to the data could reduce some adjusters’ recurrence count to one, so the intervention list must be confirmed again.
Align the supplied January–July summary with the proposed operational rule of two occurrences within six months. Examine whether ADJ0199’s alternating-month pattern relates to case mix or rotating assignments.
Retrieve claim identifiers, payment dates, and coverage details for ADJ0177’s two cases, then reconcile base amounts, coverage limits, and payment records.
See the analysis process in the video · Coming soonSource: the supplied synthetic claims-review analysis summary, as of July 2026. Adjuster codes and center names are fictional and do not identify real employees or customers.