What We Know About the Peer Workforce and Economic Evaluation for Peer Recovery Support Services: A Systematic Review.

Background: Peer recovery support services (PRSS) for substance use disorder (SUD) have expanded in the past 2 decades to be formally certified and reimbursed under Medicaid in almost every US state. This rapid expansion has been followed by a growth in research, but 2 persistent gaps remain: a lack of research on the peer workforce, and a lack of economic evaluation research. This systematic review examines the current literature on PRSS to summarize what is currently known about the SUD peer workforce and collect potential PRSS economic evaluation parameters, and clearly identify the current gaps in each category.

Methods: PRISMA methods were followed and a PROSPERO protocol was registered (CRD42022323516). The search included a database search of peer-reviewed journal articles and dissertations, and also a hand-search of conference presentations and evaluation reports. Manuscripts were categorized as either workforce development-related and/or those containing potential economic evaluation parameters.

Results: Forty-two total manuscripts were included, with 22 related to the peer workforce and 26 containing potential economic evaluation parameters. Manuscripts with workforce-related findings covered peer worker characteristics, characteristics of PRSS delivery, or peer worker training-related outcomes. Economic evaluation parameters were primarily costs related to service utilization patters with some limited reporting on peer worker pay, as well as multiple sources that can be used to estimate averted medical costs. Effectiveness parameters were primarily substance use related, as virtually all quality of life and life functioning parameters are not readily convertible to estimating quality-adjusted life years.

Conclusion: Future PRSS research can contribute to filling these gaps in the evidence base by addressing remaining questions about the interrelationship between peer worker job satisfaction, job tenure, and patient outcomes, as well as by using more consistent outcome measures, especially in the realm of quality of life and life functioning.