Claims of occupational psychiatric disability have significantly increased over the past 20 years. This article is the third in a series on avoiding psychiatric disability overdiagnosis. The first article focused on general disability issues and their effects and defined basic terms and models. The second article focused on improving the diagnosis and assessment of mental health disorders and psychiatric work disability. In this final article, we focus on iatrogenesis in diagnosing mental health work disability and argue for implementing a comprehensive disability assessment approach.