Autistic people in England face worse health outcomes than non-autistic people. Autism-specific annual health checks have been proposed as one solution to this issue. This study identified strategies to incentivise primary care providers to offer autism-specific annual health checks, using a behavioural science approach. In phase 1, we conducted interviews and focus groups with autistic people (n = 10) and primary care providers (n = 11). In phase 2, we conducted a national survey of primary care providers (n = 196). Qualitative data were analysed using a framework method and the Theoretical Domains Framework. Quantitative data were analysed descriptively, and comparisons between sub-groups of survey respondents were made using Mann-Whitney U and Kruskal-Wallis tests. The most salient theoretical domain was environmental context and resources. Participants identified lack of time and staff as key barriers to implementation. Delegating tasks to non-physician practitioners and automating processes were seen as key facilitators. Autism-specific knowledge was another relevant domain; education produced and delivered by autistic people was posited to increase health check uptake and quality. Overall, participants were enthusiastic about autism-specific annual health checks but were concerned about the practical aspects of implementation. We identified specific barriers and facilitators that can be addressed prior to policy adoption to maximise chances of success.