What insurance company denies the most medical claims?

Written by Editorial Team | Last Updated: August 2026

Quantifying which specific health insurance company denies the highest volume or percentage of medical claims is complex due to varying state regulations, plan types, and corporate reporting structures, but extensive regulatory data reveals distinct patterns among major health insurers. Large commercial managed care organizations and nationwide health maintenance organizations frequently report high absolute numbers of denied claims, driven by automated utilization management reviews, prior authorization requirements, and strict medical necessity guidelines. Publicly available reports from federal healthcare marketplaces and state insurance commissioners often indicate that massive enterprise insurers like UnitedHealthcare, Anthem, and Centene process millions of claims daily, resulting in significant aggregate denial volumes affecting patient access to care.

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