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Total ACO Participation by Year
ACO Model 2012 2013 2014 2015 2016 2017 2018 2019 Feb/19* 2019 *July 2020 2021
All Medicare ACOs 148 252 359 423 463 525 612 528 559 558 518
Track 1 114 217 333 399 411 438 460 394 258 134 119
Track 1+             55 49 28 20 17
Track 2 2 3 3 5 6 6 8 7 5 2 2
Track 3         16 36 38 37 0 0 0
Basic A                 33 54 18
Basic B                 75 137 145
Basic C                 5 20 30
Basic D                 1 1 1
Basic E                 41 69 69
Enhanced                 72 80 76
Next Gen         21 45 51 41 41 41 41
Pioneer 32 32 23 19 9            
Direct Contracting Entities                     53