Statewide Collaboration to Improve CR E75 E xercise-based cardiac rehabilitation (CR) is an underutilized service with well-documented clinical and functional benefits for patients with cardiovascular disease. 1-4 Despite strong recommendations supporting its use across a spectrum of cardiovascular conditions and procedures, only a quarter of eligible patients attend a single session of CR and even fewer patients complete the recommended 36 CR sessions. [5][6][7][8][9] Participation in CR varies on the basis of age, race, sex, type of qualifying event, type of health insurance, discharging hospital, and geographic region, suggesting opportunities for targeted quality improvement efforts. [10][11][12][13][14][15][16][17][18][19] Professional societies and federal agencies have set national goals for CR enrollment, developed a road map and resources to achieve this goal, and created valid and reliable performance measures to benchmark CR performance, yet significant and sustained improvement in CR participation remains elusive. [20][21][22] Regional quality improvement collaboratives may provide one solution to improving CR participation and quality through benchmarking performance and facilitating quality improvement efforts. In Michigan, statewide collaborative quality initiatives (CQIs) were developed as a partnership between hospitals, physicians, and a large private insurer with the goal of improving quality and costs of care through data collection and the sharing of best practices. 23 For almost 25 yr, the CQI model has demonstrated success in evaluating and improving the quality of care for patients undergoing cardiovascular procedures. [24][25][26][27][28][29] For example, the Blue Cross Blue Shield of Michigan Cardiovascular Consortium (BMC2), a CQI focused on improving outcomes after percutaneous coronary intervention (PCI), reduced the risk-adjusted rate of acute kidney injury after PCI from 3.3% in 2010 to 2.5% in 2016 through the development and sharing of best practices around identifying patient-specific contrast thresholds and emphasizing periprocedural hydration. 30 In this spirit, the BMC2 partnered with another CQI, the Michigan Value Collaborative (MVC), to identify and evaluate variation in the use of CR after PCI, coronary artery bypass grafting (CABG), and medically managed acute myocardial infarction (AMI) using clinical and claims data registries. 10,11,31 Establishing engagement across inpatient and outpatient settings using the CQI model is a needed step to assist with improving CR enrollment and quality.