ACO indicates accountable care organization; PCP, primary care provider.
PCPs were considered to be physicians who had a primary specialty designation of family medicine, internal medicine, or geriatric medicine. The percentages reported represent the average of the individual ACO percentage allocations for each category. The “other” category represents allocations given to investors/shareholders and non-ACO participants. ACOs including a hospital allocated a larger percentage of shared savings to PCPs, specialists, and/or hospitals within the ACO (P = .01).