Background: Payments from pharmaceutical drug manufacturers to authors of clinical practice guidelines (CPGs) may have an impact on their recommendations. In this study, we aimed to evaluate the accuracy of financial conflict of interest (FCOI) declarations among authors of Inflammatory Bowel Disease (IBD) guidelines.

Methods: We collected data on industry payments to authors of IBD guidelines published by the American Gastroenterology Association (AGA), American College of Gastroenterology (ACG) and American Society of Gastrointestinal Endoscopy (ASGE). We reported the accuracy of the authors' declarations by comparing their statements in the FCOI section of the guidelines with the data reported on the Centers for Medicare and Medicaid Services website (CMS-OP). We also investigated the adherence of IBD guidelines to the National Academy of Medicine (NAM) criteria for trustworthy guidelines.

Results: A total of eight clinical practice guidelines and 35 individual authors were included. Four authors had no profile identified at CMS-OP. The total payment to all included authors was $10,575,843.06, with a mean payment of $314,242.38 per author. A total of 28/35 authors (80%) received payment from pharmaceutical companies, 23/35 (65.7%) received $10,000 or more, 15/35 (42.8%) received $100,000 or more and 3/35 (8.57%) received $1,000,000 or more. Total discrepancies identified while comparing the authors' declaration of their FCOI and CMS-OP were 28: ACG had 12/14 (85.7%), AGA had 7/12 (53.8%) and ASGE had 9/10 (90%) discrepancies. None of the guidelines met all NAM criteria and 4/8 (50%) guidelines met none.

Conclusions: Discrepancies exist between authors' declarations in the FOCI section and data on CMS-OP. Poor compliance with the NAM criteria was prevalent among authors of IBD guidelines. More transparency in reporting and monitoring is needed.