Can Hospital Employees Report Billing Fraud Without Proof?

https://www.acid-bookmarks.win/when-a-1-2b-hospital-billing-scheme-triggered-a-record-fca-recovery-that-moment-that-changed-how-i-view-whistleblower-timelines

Which questions about reporting hospital billing fraud without proof should you expect answered here? If you're a hospital employee worried that billing practices cross legal lines but you lack concrete proof, you're not alone