This guidance document provides the FDA’s recommendations on a risk-informed framework for credibility assessment of computational modeling and simulation (CM&S) used in medical device regulatory submissions. This guidance applies to physics-based, mechanistic, or other first principles-based models. The recommendations are intended to promote consistency and facilitate efficient review of medical device submissions, to increase confidence in the use of CM&S in regulatory submissions, and to facilitate improved interpretation of CM&S credibility evidence submitted in regulatory submissions.