https://www.ahrq.gov/sites/default/files/wysiwyg/chsp/bundled-payments_0.pdf

AHRQ Stats: Hospital Participation in a Medicare Bundled Payment Model

About 28 percent of hospitals that are part of health systems participated in a Medicare bundled payment model in 2016, whereas only 8 percent of nonsystem hospitals participated in Medicare bundled payment models. (Source: AHRQ, Compendium of U.S. Health Systems—Health System Participation in Medicare Bundled Payment Models, 2016.)