This article reports results from the implementation of a model of professional development (PD) to help K-5 teachers develop the knowledge and skills to teach Computer Science (CS) in classrooms of diverse students, including students with high-incidence disabilities. This article describes our Inclusive CS model of PD, how we made the PD model available to teachers during a pandemic and presents quantitative and qualitative results about the impact of the PD on teachers' knowledge, comfort, and beliefs related to teaching computer science to students. Results indicate that the teachers' knowledge, comfort, beliefs and perceptions about teaching CS to students with disabilities significantly improved. Teachers' knowledge and understanding of Universal Design for Learning for supporting students in learning about CS also improved.