Understanding ICD-10-CM Excludes1 Violations and Their Impact on Claims Processing
By Elina Sabilova, Billing Department, WCH
Fidelis Care, a major Medicaid managed care plan in New York, has intensified enforcement of diagnosis code editing rules based on ICD-10-CM coding guidelines. This has resulted in widespread claim denials, rejections, and recoupments across multiple specialties—particularly podiatry, mental health, and other high-volume provider groups.
Key Takeaways:
- This is not a new policy—Fidelis is enforcing longstanding federal ICD-10-CM coding standards, specifically “Excludes1” rules that prohibit certain diagnosis code combinations
- The enforcement is legally compliant—it aligns with CMS and CDC Official Guidelines for Coding and Reporting that all Medicaid and Medicare providers must follow
- Clinical appeals will not succeed—denials based on coding guideline violations cannot be overturned by clinical justification alone; the solution is correcting the claim
- Retrospective recoupments are occurring—Fidelis is conducting reviews of previously paid claims and recovering payments for coding violations, even from months or years ago
- Corrected claims are the remedy—providers must identify conflicting diagnosis pairs, remove the inappropriate code, and resubmit as corrected claims (not appeals) within 60 days
- Prevention is essential—implementing prepayment claim validation tools that flag Excludes1 violations before submission is the most effective strategy to protect revenue
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