Volume 49 | Number 5 | October 2014

Abstract List

Stephen M. Shortell Ph.D., M.P.H., M.B.A., Sean R. McClellan Ph.D., Patricia P. Ramsay M.P.H., Lawrence P. Casalino M.D., Ph.D., Andrew M. Ryan Ph.D., M.A., Kennon R. Copeland Ph.D., M.S.


To provide the first nationally based information on physician practice involvement in s.

Data Sources/Study Setting

Primary data from the third National Survey of Physician Organizations (January 2012–May 2013).

Study Design

We conducted a 40‐minute phone survey in a sample of physician practices. A nationally representative sample of practices was surveyed in order to provide estimates of organizational characteristics, care management processes, ACO participation, and related variables for four major chronic illnesses.

Data Collection/Extraction Methods

We evaluated the associations between participation, organizational characteristics, and a 25‐point index of patient‐centered medical home processes.

Principal Findings

We found that 23.7 percent of physician practices ( = 280) reported joining an ; 15.7 percent ( = 186) were planning to become involved within the next 12 months and 60.6 percent ( = 717) reported no involvement and no plans to become involved. Larger practices, those receiving patients from an and/or , those that were physician‐owned versus hospital/health system‐owned, those located in New England, and those with greater patient‐centered medical home () care management processes were more likely to have joined an .


Physician practices that are currently participating in s appear to be relatively large, or to be members of an or , are less likely to be hospital‐owned and are more likely to use more care management processes than nonparticipating practices.