To the Editor We write to report and explain errors that occurred in the Original Investigation, titled “Association Between Medicare Accountable Care Organization Implementation and Spending Among Clinically Vulnerable Beneficiaries,”1 that was published online on June 20, 2016, and in the August 2016 issue of JAMA Internal Medicine. The article reported the results of a cohort study designed to estimate the association between Medicare accountable care organization (ACO) contracts with spending and high-cost institutional use for the overall Medicare population and a clinically vulnerable subgroup of Medicare beneficiaries from January 2009 through December 2013. The main outcome measures of our study were total spending per beneficiary-quarter, spending categories, use of hospitals and emergency departments, ambulatory care–sensitive admissions, and 30-day readmissions. We determined that the Medicare ACO programs were associated with modest reductions in spending and use of hospitals and emergency departments and that savings were realized through reductions in use of institutional settings in clinically vulnerable patients.
Colla CH, Lewis VA, Kao L, O’Malley AJ, Chang C, Fisher ES. Notice of Retraction and Replacement: Colla et al. Association between Medicare accountable care organization implementation and spending among clinically vulnerable beneficiaries. JAMA Internal Medicine. 2016;176(8):1167-1175. JAMA Intern Med. 2017;177(11):1702–1703. doi:10.1001/jamainternmed.2017.4130
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