In the 1990s, Dr. Mike Laposata created the world's first Diagnostic Management Team (DMT) at Massachusetts General Hospital, in order to better care for patients with coagulation disorders. In this interview, he discusses the distressing and all too common issue of diagnostic errors, and how a collaborative, team-based approach can make a vital difference. Laposata also addresses the systemic barriers to team-based diagnosis such as the lack of insurance reimbursement, and suggests ways to surmount these barriers and scale up DMTs.