Physician Group Size by 2014 ACO Participation,
2008–2013, Stratified by Baseline Primary Care Orientation
and Baseline Size
SOURCE Authors’ analysis of data from
the Centers for Medicare and Medicaid.
NOTES All panels result from separate
within-market analyses, presenting the average pre- and post-period
value of the dependent variable, by 2012, 2013, or 2014 ACO
participation. Physician’s average group size was calculated
as the average count of physician billing for outpatient care within
a TIN, weighting each TIN by its share of total physicians in the
MSA. Primary care orientation was calculated as the share of
physicians billing under a TIN with a primary care specialty. ACO is
Accountable Care Organization.