Costs and Implementation Effectiveness of Generalist Versus Specialist Models for Adolescent Screening and Brief Intervention in Primary Care.

OBJECTIVE: This study analyzed the marginal service and program costs, and conducted a cost-effectiveness analysis (CEA) of two models of implementation of adolescent substance screening, brief intervention, and referral to treatment (SBIRT).
METHOD: SBIRT was implemented at seven clinics in a multisite, cluster-randomized trial, through a Specialist model (behavioral health counselor-delivered brief intervention), and a Generalist model (primary care provider-delivered brief intervention). The CEA calculated marginal costs using an activity-based costing methodology for direct SBIRT services, and effectiveness was measured by the proportion of brief interventions delivered among patients who screened positive for alcohol, tobacco, or other drugs. Site-level program costs comprised start-up and maintenance (training and technical assistance). Costs were estimated in 2017 U.S. dollars.
RESULTS: The marginal cost of SBIRT per patient with a positive screen for brief intervention was $6.72 in the Specialist model and $6.05 in the Generalist model. Implementation effectiveness was 7.2% (SE = 2.9%) in the Specialist model and 37.7% (SE = 5.6%) in the Generalist model. The program costs to provide SBIRT for 1 year per site were $13,548 for the Specialist site and $12,081 for the Generalist.
CONCLUSIONS: The Generalist model was more effective in implementing brief intervention and less expensive than the Specialist model. Results were robust to sensitivity analysis. Brief intervention delivered by primary care providers rather than by handoff to a behavioral health counselor may ensure greater penetration and a lower cost of these services in primary care settings.