Individuals with serious mental illnesses experience significant barriers to accessing medical care. Assertive Community Treatment teams serve these individuals using a multidisciplinary approach in the community, helping ACT participants overcome the barriers to accessing satisfactory physical healthcare and can be key to primary and behavioral healthcare integration for individuals with SMI. In this study, qualitative interviews were conducted with ACT teams and medical providers to evaluate how they collaborate and coordinate care for ACT participants. Successful strategies for coordination involved organizational support, advocacy, negotiating levels of care, and coordinated treatment planning. While ACT teams discussed many successful strategies, a more standardized approach to community partner collaboration with medical stakeholders is suggested.