Is the decision to submit a 510(k) application versus a Premarket Application (PMA) at the sole discretion of a medical device manufacturer? The answer is not always clear to product liability lawyers, judges, and juries. FDA recently published revised guidance on its “Refuse to Accept Policy for 510(k)s” that reinforces and clarifies that the regulatory path may be analyzed multiple times by FDA before it clears a 510(k) device. This clarification underscores the reality that the type of application submitted is largely dictated by the agency, not the applicant. This post discusses some key takeaways from this new guidance before briefly discussing how this guidance may be implicated in medical device litigation.