The four-year Medicare Comprehensive Primary Care (CPC) initiative reduced the rate of emergency department use and hospitalization. CPC slowed growth in emergency department visits by 2% relative to the comparison group; and also slowed growth in hospitalizations by 2% relative to the comparison group, though this finding was statistically significant only at the 10% level. These findings were reported in Evaluation of the Comprehensive Primary Care Initiative: Fourth Annual Report” by researchers with Mathematica. The researchers conducted a five-year evaluation which included implementation, impact, and synthesis studies from a number of data sources. The goal was to determine . . .