Medical coding and billing auditor
Expert class library · Healthcare fraud and False Claims Act · Either side
Reviews medical records against billed CPT, ICD-10 and HCPCS codes to identify upcoding, unbundling and unsupported claims, and compares billed charges with coded benchmarks. Courts generally admit experienced coding and Medicare billing reviewers whose opinions rest on published coding rules and charge data, but exclude opinions that simply apply the law to assumed facts and tell the jury a claim was false.
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What this expert is retained to answer
- Which coding rules, CMS manuals or payer guidance did the reviewer apply, and were they in force when the claims were billed?
- Did the reviewer compare each billed code with the medical record, or rely on facts assumed from counsel?
- Is the reviewer testifying about what the codes and rules require, or offering a conclusion that the claims were false or fraudulent?
- What charge database and percentile did the reviewer use to judge reasonableness, and why that percentile?
- What credentials and claims processing or auditing experience does the reviewer have?
Methods
- CPT and E/M level review
- NCCI edit analysis
- Documentation sufficiency review
- Modifier usage analysis
- Charge benchmarking by CPT code (FAIR Health percentiles)
How the testimony is attacked
- Legal conclusions about falsity. Defendants move to bar opinions that claims were false under Medicare rules. In United States ex rel. Johnson v. Golden Gate National Senior Care the District of Minnesota excluded a Medicare compliance expert's as applied opinions as bare legal conclusions while admitting her testimony on the governing requirements.
- Assumed facts and contradictory evidence. Challengers argue the reviewer relied on a selective set of assumed facts. Golden Gate held that reliance on patient records, depositions and e-mails, despite some contrary evidence, went to cross-examination, but barred the expert from vouching for the assumed facts.
- Nonbinding or wrong standards. Opponents argue the reviewer applied guidance that does not bind the provider. Golden Gate declined to exclude an expert who relied on CMS standards, contractor guidance and professional organization materials that experts in Medicare compliance reasonably use.
- Experience as the basis for expertise. Defendants attack billing experts who lack formal scientific method. In United States v. Brown the Fifth Circuit upheld admission of a Medicare claims contractor employee's testimony on supplier billing practices in an upcoding prosecution, based on his experience.
- Charge database and percentile choice. Providers attack reliance on FAIR Health or similar databases built from charge data. In Rupp v. Premier Health Partners the Ohio Second District upheld admission of a billing expert who compared a surgeon's charges by CPT code with the 75th percentile of regional charges.
What the public record shows
A deliberately narrow CourtListener search, (upcoding OR "coding expert" OR "billing expert" OR "CPT codes") AND expert AND (Daubert OR "Rule 702"), returned 14 opinions filed since 2015, as of October 3, 2026; broader searches return more. Three that show how courts handle this class of testimony:
| Outcome | Case | Court | Why |
|---|---|---|---|
| Limited | United States ex rel. Johnson v. Golden Gate National Senior Care, L.L.C.223 F. Supp. 3d 882 | D. Minn. 2016 | In a False Claims Act case over therapy billed under an individual therapy CPT code, the court declined to exclude a Medicare compliance expert for flawed methodology but excluded her as applied opinions as legal conclusions and barred testimony that would usurp the factfinder. |
| Admitted | United States v. Brown871 F.3d 352 | 5th Cir. 2017 | The Fifth Circuit held the district court did not abuse its discretion under Rule 702 in admitting a Medicare claims contractor employee as an expert on Medicare and medical equipment supplier billing practices in a fraud prosecution involving upcoded braces. |
| Admitted | Rupp v. Premier Health Partners2025-Ohio-985 | Ohio Ct. App. 2025 | The court upheld admission under Ohio Evid.R. 702 of a coding and billing expert who used CPT codes and a FAIR Health based charge database at the 75th percentile to show a surgeon's balance bills exceeded usual and customary charges. |
Each case links to the free opinion text on CourtListener.
Under amended Rule 702
Since December 1, 2023, Rule 702 says expressly that the party offering an expert must show the court it is more likely than not that the testimony meets each requirement: that it rests on sufficient facts or data, uses reliable methods, and reflects a reliable application of those methods to the case. Questions about the basis of an opinion are no longer automatically matters of weight for the jury. For how the circuits have applied the amendment, see the Rule 702 tracker, which follows each court of appeals; for what that means for preparing or attacking this class of expert, see the guide on amended Rule 702.
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Last reviewed October 3, 2026. How this page is built: rulings are found by searching court opinions on CourtListener, and each one is read in the opinion before it is summarised here; outcomes are labelled by what the court did with the expert's testimony. No individual expert is named. This page summarises public decisions for orientation and is not legal advice; read the opinion before relying on any ruling.