Advancing the Learning Health System by Incorporating Social Determinants

Deepak Palakshappa, MD, MSHP; David P. Miller Jr, MD, MS; and Gary E. Rosenthal, MD

The learning health system (LHS) has emerged as a powerful framework for improving healthcare delivery.1,2 The Institute of Medicine (IOM) defined an LHS as “one in which science, informatics, incentives, and culture are aligned for continuous improvement and innovation, with best practices seamlessly embedded in the care process, patients and families active participants in all elements, and new knowledge captured as an integral by-product of the care experience.”2,3 An LHS can improve care at multiple points along a patient’s clinical trajectory by providing clinicians real-time access to the best available evidence, partnering with patients and their families, incentivizing high-value care, and creating a culture of continuous learning.2 Ultimately, this could lead to a patient-centered LHS on a national scale that allows data sharing across health systems and informs decisions that improve population health and reduce health disparities.4

The LHS framework is beginning to take shape, and we believe that realizing its full potential is linked to a health system’s ability to effectively account for and mitigate the social and economic factors that affect health. Social determinants of health (SDH)—the conditions in which people are born, grow, live, and age—have a profound impact on morbidity and mortality. SDH can lead to social risk factors (eg, food insecurity, housing instability) that can negatively affect health.5-7 Historically, reducing social risk factors has been the focus of public policy and public health, not healthcare. Increasing attention has focused on health systems’ potential to reduce patients’ social risk factors.7-9 The National Academy of Medicine (NAM; formerly the IOM) has recommended a core set of social domains that health systems should document in the electronic health record (EHR).10 Increasing research has also shown that addressing patients’ unmet social needs in clinical settings can improve patients’ access to resources, which, in turn, may improve health outcomes and decrease costs.11-13 With this research as a backdrop, CMS implemented the Accountable Health Communities model to test whether addressing unmet social needs reduces healthcare utilization.14

Eliminating the health disparities that emerge from SDH will require broad social, cultural, and policy changes.15 Nonetheless, health systems have an important role in improving health equity, and the LHS could fail to reach its mission of higher-quality, safer, and more efficient care if such systems do not integrate data on SDH or activities to reduce social risk factors.

In this paper, we discuss the role the LHS should play in addressing social risk factors. We further discuss 3 areas—patient engagement, personalized care, and effectiveness of care—in which the LHS is unlikely to reach its full potential without integrating SDH data.

Role of the LHS in Reducing the Impact of Social Risk Factors

If the goals of the LHS are to improve health and provide more efficient healthcare, it must mitigate the negative effects of social risk factors. Several lines of reasoning support this. First, a large body of evidence indicates that SDH have a greater impact on health than healthcare does. Even if health systems provide optimal healthcare for every patient, only a small improvement in population health would likely be seen.5,6 Second, although the United States spends more on healthcare, it ranks last among other developed nations for a number of important health outcomes, potentially due to lower levels of spending on social programs.16 Because the United States lacks broad bipartisan support for expansion of public health and social programs, health systems must build new partnerships with social services if they are to improve population health. Third, the drive to value-based purchasing, the emergence of accountable care organizations, and the creation of financial incentives for controlling expenditures have established a strong business case for the LHS to address the social factors that lead to increased utilization.

Although research on the effect of reducing social risk factors in clinical settings on healthcare utilization and health outcomes is limited, early results have shown promise.12,13,15 One example is Hennepin Health, which used care coordinators, social workers, and community health workers to connect patients to social services and found a 9% decrease in emergency department visits.12 Another study found that identifying and addressing patients’ unmet social needs using Health Leads, a community-based healthcare organization that connects patients with resources, led to small but significant improvements in blood pressure and cholesterol.13

How Incorporating Data on SDH Could Advance the Mission of the LHS

Enhance patient engagement. A major goal of the LHS is to improve patient engagement so that patients have a more active role in the shared decision-making process. Understanding the social circumstances in which patients live is central to this goal. For example, advising a patient to increase physical activity when the patient does not have a safe space in which to exercise is unlikely to be effective. In one study that screened patients for social needs, clinicians reported that this information changed care delivery for almost a quarter of patients with an identified need and changed their interactions with more than half.17 However, few clinicians screen patients for unmet social needs, and there are limited data on how practitioners can incorporate interventions in clinical settings to reduce social risks.18,19 The LHS offers an opportunity to address these gaps by partnering with patients and the community. For example, to improve educational materials about cancer screening for patients with low health literacy and facilitate physician-patient communication, this social risk–informed care could utilize an LHS community model in which community members are involved in the development process.20,21
Delivery of personalized care. In 2015, the National Institutes of Health launched the Precision Medicine Initiative (PMI) to understand the drivers of health and develop personalized treatments. A central element of the PMI is the All of Us Research Program, which plans to enroll 1 million adults to investigate how differences in genomics, environment, and lifestyle can contribute to the development of precision medicine treatments.22 Although not in the original LHS framework, the NAM published a 2015 workshop summary describing the inclusion of genomic data in the LHS.23 The LHS offers an opportunity to understand how integration of genomic data affects healthcare delivery.24 As an example, Geisinger Health is integrating individual genomic data within the EHR to inform patient care about disease risk.25 However, social risk factors often have a greater influence on disease occurrence than genetic risk factors. For the genomics-enabled LHS to provide precision medicine, it must account for these social factors that affect health and healthcare.26 Further, an LHS that combines data on individuals’ genomics and social risk factors can better elucidate causal pathways leading to health disparities and tailor the delivery of care.

Evaluate the effectiveness of care. A further goal of the LHS is to close the gap between evidence generation and clinical care, particularly the lack of generalizability of randomized controlled trials.2,3 One method to accomplish this is through pragmatic trials that evaluate the effectiveness of treatments in real-world settings. The LHS, with its EHR and robust data collection systems, is an ideal setting for pragmatic trials.27 However, without accounting for patients’ social factors, evaluating the effectiveness of treatments in the LHS could be incomplete. For example, one study evaluated the effect of neighborhood poverty on the impact of a primary care practice–based trial for depression. The authors found that the treatment effect weakened after the initial 4 months among participants living in high-poverty neighborhoods but not among participants in other neighborhoods.28 Thus, the failure to account for social risk factors could lead to effective treatments and novel healthcare delivery strategies showing minimal benefit as a result of unmeasured SDH. Similarly, collecting SDH data could shed light on ways in which social factors mediate the effect of treatments on health.29 Intermountain Healthcare is an LHS that is using an area-level deprivation index to evaluate heterogeneity in medication adherence among patients with hypertension.30


The LHS is a powerful framework for improving the cost and quality of healthcare. However, realizing the full potential of the LHS will require moving beyond the traditional boundaries of healthcare and developing innovative approaches to reduce social risk factors. Although the evidence base for the effectiveness of such approaches on improving health is currently limited, early results suggest that addressing patients’ unmet social needs can decrease costs and improve outcomes. We believe it is imperative that the LHS add to this evidence. An LHS that is able to rapidly evaluate and improve care could be an ideal setting in which to pilot interventions reducing social risk factors. This process should begin with the routine collection of SDH data. Making these data a part of the LHS should enhance patient engagement, allow for tailoring of care, and more accurately evaluate the care experience.
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