Health promotion for multimorbidity remains concentrated in U.S. programs, with policy action absent
People living with multiple long-term conditions carry a heavy clinical burden, and the load falls unevenly on ethnic minority populations. This scoping review mapped health promotion interventions designed for people with MLTC in OECD countries and found a field that is still narrow, geographically concentrated, and thin at the policy level. Twenty-six studies met inclusion criteria, and 24 of them came from the United States. Only one study each was identified from Canada and Australia.
The pattern matters because multimorbidity is rarely a problem that yields to single-site or single-discipline fixes. Patients with several chronic conditions move through primary care, specialty clinics, community settings, and family networks, often while navigating language barriers, access barriers, and structural disadvantage. Interventions that reach only one layer of that experience may improve individual knowledge or clinic attendance, but they do not necessarily alter the conditions that drive unequal outcomes in the first place.
The intervention mix emphasized skills and service reorientation
The review used the Ottawa Charter as its organizing framework, and the interventions mapped most consistently to developing personal skills, which appeared in all 26 studies. In practical terms, this means the evidence base has leaned heavily toward education, self-management support, coaching, and related behavior-focused strategies. Those approaches are clinically intuitive: people managing diabetes, hypertension, depression, asthma, or other coexisting illnesses need tools to understand medications, monitor symptoms, and make day-to-day decisions that prevent decompensation.
A second major category was creating supportive environments, present in 23 studies, followed by reorienting health services in 21 studies. Together, these findings suggest that many investigators recognized the need to move beyond generic education and toward care models that are easier to access and use. Supportive environments can include peer support, culturally responsive settings, or delivery formats that reduce friction for patients who already face repeated contact with the health system. Reorienting health services often implies redesigning how care is delivered, coordinated, or communicated so that multimorbidity is managed more coherently.
No intervention directly addressed healthy public policy.
That omission is the sharpest finding in the review. Policy action sits upstream of clinic-based care, shaping financing, access, workforce design, language support, transportation, preventive services, and the legal or administrative barriers that determine who can actually benefit from health promotion. Without policy-level intervention, the field risks repeatedly treating the downstream consequences of inequity while leaving the upstream architecture untouched.
Why personal-skills interventions dominate the evidence base
The dominance of individual-level strategies is not surprising. These programs are easier to design, easier to deliver, and easier to evaluate than interventions that target systems or policy. They also fit neatly into common outcome structures, where changes in knowledge, self-efficacy, adherence, or self-management behaviors can be measured over relatively short time horizons. For a patient with multimorbidity, such gains can still be meaningful. Better medication understanding, more structured self-care, and clearer symptom recognition can reduce avoidable deterioration.
Yet the same design convenience can narrow the clinical imagination. Ethnic minority populations living with MLTC often face intersecting burdens that are not solved by education alone. If a patient cannot afford prescriptions, cannot easily reach clinic visits, or receives fragmented advice from multiple clinicians, added information does little unless the surrounding care structure changes as well. The review’s mapping shows that researchers have begun to address service delivery and community context, but the policy layer remains untouched.
Geographic concentration limits what can be generalized
The heavy U.S. concentration shapes how confidently these findings can be carried into other OECD settings. Health systems differ substantially across countries in primary care organization, insurance coverage, immigrant health policy, and community-based support structures. A program that works in one setting may depend on infrastructure or reimbursement pathways that do not exist elsewhere. With 24 of 26 studies based in the United States, the evidence base is not yet broad enough to claim a balanced OECD picture.
This also limits insight into how interventions perform across distinct ethnic minority groups. The review’s inclusion criteria required at least 50% ethnic minority participants living with MLTC, which strengthens relevance to the target population, but the abstracted evidence still leaves many unanswered questions about cultural tailoring, language adaptation, and implementation in underrepresented health systems. A scoping review is designed to map what exists rather than prove comparative effectiveness, and here the map shows substantial blank space outside the U.S. setting.
Multilevel care is plausible, but the evidence has not reached policy design
From a biological and clinical standpoint, the rationale for multilevel intervention is strong. Multimorbidity amplifies inflammation, symptom burden, treatment complexity, and the risk of care fragmentation. When a patient’s chronic conditions interact, the clinical problem is rarely a single diagnosis. It is the cumulative effect of multiple diseases, medications, appointments, and social constraints. Interventions that operate only at the individual level may improve coping, but they cannot by themselves rebuild the system that produces unequal disease burden.
The review’s classification against the Ottawa Charter makes that gap visible. Four action areas were represented, and one was absent. Healthy public policy is not a peripheral detail in this context; it is the mechanism through which equitable access, language services, preventive care, and structural supports are normalized rather than left to local improvisation. The lack of direct policy-oriented intervention signals that the field remains in an early developmental stage.
Research priorities now point toward systems that can carry the burden
The practical direction from this review is straightforward. Future work in OECD countries needs to move beyond isolated education programs and toward interventions built across multiple levels of care. That means pairing self-management support with service redesign, community engagement, and explicit policy mechanisms that can be implemented and evaluated. It also means expanding research beyond the United States so that findings better reflect the range of health systems in which ethnic minority populations live with MLTC.
The evidence base is real, but it is still immature. Twenty-six studies are enough to show direction, not enough to show maturity. The absence of policy action is the most important gap, because it leaves the structural causes of inequity largely outside the intervention frame. Until research begins testing multilevel programs that include policy design, the field will continue to describe the burden of multimorbidity more convincingly than it reduces it.