IntroductionIntegrating primary care and behavioural health services improves access to services and health outcomes among individuals with serious mental illness. Integrated care is particularly promising for racial and ethnic minority individuals given higher rates of chronic illnesses and poorer access to and quality of care compared to Whites. However, little is known about integrated care implementation in non-White populations. The aim of this study is to identify facilitators and barriers to successful implementation of primary care-behavioural health integration in a multilingual behavioural healthcare setting.MethodsSeven focus groups and five semi-structured interviews were conducted with 41 patients and 5 providers participating in integrated care in a community mental health clinic in California serving Asian immigrants.ResultsThemes generated from constant comparative analysis suggest limited system-level preconditions and cross-organisational dynamics challenged integrated care. At the same time, changing organisational culture and practice, improving patient-provider and provider-provider communication, and increasing patient involvement enhanced clinical outcomes and facilitated successful implementation.Discussion and conclusionsFindings highlight the importance of patient involvement, peer services and interdisciplinary communication to successfully implement integrated care in the face of linguistic and operational challenges in settings serving multilingual and multicultural patients.