Mike Adelberg co-authored a research study for Health Affairs describing how primary care physician networks have changed over time in Medicare Advantage.
"Our findings suggest that among plans within our sample, these networks are relatively broad and that enrollment in broader-network plans is growing over time (though this might not be generalizable to all plans). Additionally, we found that more narrow networks are more common in more competitive markets, which may suggest that one way plans respond to competitive pressures is through changes in network extent."adelberg,Feyman, figueroa, polsky and frakt, health affairs
