• Kimberly Danae Cauley Narain, Norman Turk, O Kenrik Duru, Tannaz Moin, and Carol M Mangione.
• Division of General Internal Medicine and Health Services Research (GIM/HSR), Department of Medicine, David Geffen School of Medicine, University of California, 1100 Glendon Ave., Suite 850, Los Angeles, CA, 90024, USA. KNarain@mednet.ucla.edu.
• J Gen Intern Med. 2023 May 1; 38 (7): 167216801672-1680.

BackgroundThe socioeconomic status (SES) gradient in hospital and emergency room utilization among adults with type 2 diabetes (T2DM) is partially driven by cost-related non-adherence.ObjectiveTo test the impact of the Diabetes Health Plan (DHP), a diabetes-specific health plan incorporating value-based insurance design principles on healthcare utilization among low-income adults with T2DM.DesignTo examine the impact of the DHP on healthcare utilization, we employed a difference-in-differences (DID) study design with a propensity-matched comparison group. We modeled count and dichotomous outcomes using Poisson and logit models, respectively.ParticipantsCohort of adults (18-64) with T2DM, with an annual household income <$ 30,000, and who were continuously enrolled in an employer-sponsored UnitedHealthcare plan for at least 2 years between 2009 and 2014.InterventionsThe DHP reduces or eliminates out-of-pocket costs for disease management visits, diabetes-related medicines, and diabetes self-monitoring supplies. The DHP also provides access to diabetes-specific telephone case management as well as other online resources.Main MeasuresNumber of disease management visits (N = 1732), any emergency room utilization (N = 1758), and any hospitalization (N = 1733), within the year.Key ResultsDID models predicting disease management visits suggested that DHP-exposed beneficiaries had 1.7 fewer in-person disease management visits per year (- 1.70 [95% CI: - 2.19, - 1.20], p < 0.001), on average, than comparison beneficiaries. Models for emergency room (0.00 [95% CI: - 0.06, 0.06], p = 0.966) and hospital utilization (- 0.03 [95% CI: - 0.08, - 0.01], p = 0.164) did not demonstrate statistically significant changes associated with DHP exposure.ConclusionsWhile no relationship between DHP exposure and high-cost utilization was observed in the short term, fewer in-person disease management visits were observed. Future studies are needed to determine the clinical implications of these findings.© 2022. The Author(s).

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