Based on the sources, Los Angeles County Department of Mental Health (LAC-DMH) is the largest mental health service system in the nation, serving approximately one-quarter of a million residents each year [1]. The department provides a diverse spectrum of mental health services, including assessments, crisis intervention, case management, and medication support in both residential and outpatient settings [1]. Their workforce includes various professionals such as psychiatrists, psychologists, social workers, and mental health consumers [1].

The overarching goal of LAC-DMH's plans is to ensure the availability of services to children, youth, adults, and older adults most challenged by severe and persistent mental illness and to promote recovery [2]. Key concepts guiding their service delivery include the achievement of positive outcomes, delivery of services in culturally appropriate ways, and addressing disparities in access, particularly for ethnic, cultural, and underserved communities [3].

A primary issue identified in the sources regarding mental health services in Los Angeles County is fragmentation [4, 5]. Mental health, physical health, and substance abuse services are often located in different settings, provided by different agencies under separate systems, supervisors, and regulations [6-8]. This insufficient integration results in incomplete or inappropriate treatment for consumers [4]. The failure to coordinate primary and behavioral health care has led to grave consequences for individuals with serious mental illnesses, including chronic medical conditions and early mortality [9]. A significant number of people in primary care settings also need behavioral health services, yet many who suffer from diagnosable mental disorders do not seek mental health care, or receive it solely from their general physician [9, 10].

The LAC-DMH MHSA Innovations Plan is specifically focused on learning how to address this fragmentation and improve the quality of mental health services for specific populations, namely the uninsured, homeless, and under-represented ethnic populations (UREP) [3, 4, 11]. Stakeholders identified healing system fragmentation, which disproportionately affects underserved groups, as the highest priority [5]. The plan was developed through an extensive community participation process that sought innovative strategies to address fragmentation and deliver recovery-based services [4].

The plan proposes four models designed to integrate mental health services with physical health and substance abuse care:

1. Integrated Clinic Model: Combines mental health, physical health, and substance abuse services in community-based sites like primary care or mental health clinics [4, 10]. This aims to increase access by bringing services to locations people already frequent, reduce stigma associated with formal mental health settings by integrating them into primary care, and improve service quality through coordination [9, 10, 12-14]. The model supports treating serious mental illness within primary care settings [5, 15] and uses a "warm hand-off" approach between providers [16]. It requires licensed mental health providers on site [17, 18].
2. Integrated Mobile Health Team Model: A mobile, multi-disciplinary team integrates physical health, mental health, and substance abuse services specifically for individuals with mental illness who are homeless or have recently moved into permanent supportive housing [19, 20]. This model addresses the fragmentation specific to the homeless population and provides a client-centered, housing-first approach with harm reduction strategies [21, 22]. It aims to improve mental health outcomes and reduce homelessness [23].
3. Community-Designed Integrated Service Management (ISM) Model: Explicitly focuses on UREP communities by integrating formal (including mental health) and non-traditional services based on the community's definition of care [24, 25]. Services are grounded in ethnic communities and their natural support systems [25]. This model addresses specific barriers UREP face in accessing traditional mental health services, such as stigma, mistrust, language differences, and lack of culturally appropriate care [12, 26]. It uses culturally competent service integrators, including professionals and trained peers, and involves community-designed peer-based outreach, engagement, linkage, and advocacy [25, 27-29]. A core principle is that the public mental health system must adopt culturally competent and holistic strategies anchored in UREP communities that complement formal mental health services [30].
4. Integrated Peer-Run Model: Uses a peer-driven approach to identify, obtain, and coordinate mental health, physical health, and substance abuse care for uninsured adults with mental health needs (including those who may be homeless, UREP, or from other sub-populations) [31-34]. It incorporates Peer-Run Integrated Services Management (PRISM) as a client-driven alternative to traditional community mental health services and Alternative Peer-Run Crisis Houses as alternatives to hospitalization for mental health crises [32, 34-36]. The model aims to more effectively integrate peer-run programs into the public mental health system [32, 36]. Peer teams coordinate the provision of clinical services [34].

Specific challenges related to integrating mental health services highlighted in the sources include:

• Working across different settings, systems, and agencies [6-8].
• Limited capacity for communication, coordination, and information sharing among programs and providers [37].
• Integrating disparate funding streams for sustainable programs [37-40].
• Difficulties incorporating non-traditional practitioners, such as American Indian healers, into the formal mental health system regarding credentialing and billing [41-43].
• Stigma surrounding mental illness and mistrust of formal treatment settings, particularly within UREP communities [12, 26, 44].
• Providing culturally and linguistically competent mental health services countywide [26, 45].
• A lack of alternatives to costly institutional options for people experiencing a mental health crisis [32, 36].
• Difficulties fully integrating peer-run programs into the public mental health system [32, 36].
• Addressing funding gaps, such as the lack of dedicated funding for supportive services in permanent supportive housing for the mentally ill homeless [40].

The Innovations Plan aims to learn how to overcome these barriers [42, 43, 46-49]. Evaluation of the models will assess the extent of integration achieved, service levels and access to mental health services, quality of care and outcomes (including mental health outcomes), stakeholder satisfaction (including clients and providers), and cost-effectiveness [8, 14, 39, 46, 47, 50-57]. The learning questions specifically address aspects like the effectiveness of integrated models for treating individuals with mental health needs alongside other conditions, utilizing ethnic community resources, the role of peers, and the impact on stigma [38, 41, 44, 51, 53, 58-65]. Ultimately, the plan seeks to inform future system changes to better serve vulnerable populations with mental health needs [11, 60].