Peer support to reduce readmission in Medicaid-enrolled adults with substance use disorder.

Introduction: Peer support service in substance use disorder systems (PS SUD) is an optional supplement to treatment services for Medicaid-enrolled individuals across Pennsylvania. The value of PS SUD was defined through association with improved service utilization patterns. We examined service utilization in a subset of individuals receiving PS SUD following an acute service (hospitalization or withdrawal management) compared to utilization in propensity-score-matched controls via an observational analysis.

Methods: We identified all Medicaid-enrolled adults with receipt of PS SUD from 2016 to 2019 and included those with prior acute service (n = 349); the study successfully matched all to individuals receiving outpatient SUD services without peer support (n = 698). Individuals were matched on age, gender, race, ethnicity, diagnosis, and prior utilization of acute care. A large percentage of individuals receiving PS SUD (74 %) had co-occurring mental health diagnoses, which we included in matching. We examined service utilization rates via administrative paid claims data for both groups in the first 90 days following peer support/outpatient discharge.

Results: Acute service utilization differed between groups over time, p = .0014. We observed a larger reduction in the rate of acute care during PS SUD service (8.6 %) versus outpatient service (21.2 %), with lower rates remaining 90 days following PS SUD (13.8 %) or outpatient discharge (16.8 %). Individuals receiving PS SUD showed connection to community-based services in the 90 days following discharge from PS SUD, including 45.0 % receiving outpatient SUD and 31.8 % receiving outpatient mental health services.

Conclusions: Peer support may help individuals to navigate the behavioral health system and reduce hospitalization or other restrictive levels of care.