• Nicole M Benson, Mary Price, Max Weiss, Christine Vogeli, Maryann M Vienneau, Mallika L Mendu, Amy Flaster, Lisa Balentine, Lindsay Jubelt, Gregg S Meyer, and John Hsu.
• McLean Hospital, Harvard Medical School, 115 Mill St, Belmont, MA 02478. Email: nbenson@mgh.harvard.edu.
• Am J Manag Care. 2023 May 1; 29 (5): 220226220-226.

ObjectivesThe study examined a commercial accountable care organization (ACO) population and then assessed the impact of an integrated care management program on medical spending and clinical event rates.Study DesignRetrospective cohort study of high-risk individuals (n = 487) in a population of 365,413 individuals aged 18 to 64 years within the Mass General Brigham health system who were part of commercial ACO contracts with 3 large insurers between 2015 and 2019.MethodsUsing medical spending claims and other enrollment data, the study assessed the demographic and clinical characteristics, medical spending, and clinical event rates of patients in the ACO and its high-risk care management program. The study then examined the impact of the program using a staggered difference-in-difference design with individual-level fixed effects and compared outcomes of those who had entered the program with those of similar patients who had not entered.ResultsThe commercially insured ACO population was healthy on average but included several hundred high-risk patients (n = 487). After adjustment, patients within the ACO's integrated care management program for high-risk patients had lower monthly medical spending (by $1361 per person per month) as well as lower emergency department visit and hospitalization rates compared with similar patients who had yet to start the program. Accounting for early ACO departure decreased the magnitude of the program effects as expected.ConclusionsCommercial ACO populations may be healthy on average but still include some high-risk patients. Identifying which patients might benefit from more intensive care management could be critical for reaping the potential savings.

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