MedPAC's 2019 commission report to Congress outlined data on ASC characteristics, including facility growth.
The change in the number of Medicare-certified ASCs from 2012 to 2017:
2012
New: 176
Closed or merged: 114
Total: 5,216
2016
New: 159
Closed or merged: 90
Total: 5,474
2017
New: 189
Closed or merged: 60
Total: 5,603
Average percentage change
2012-2016: 1 percent
2016-2017: 2.4 percent