| Total ACO Participation by Year |
| ACO Model |
2012 |
2013 |
2014 |
2015 |
2016 |
2017 |
2018 |
2019 Feb/19* |
2019 *July |
2020 |
2021 |
2022 |
| All Medicare ACOs |
148 |
252 |
359 |
423 |
463 |
525 |
612 |
528 |
559 |
558 |
518 |
582 |
| 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 |
29 |
| Basic B |
|
|
|
|
|
|
|
|
75 |
137 |
145 |
170 |
| Basic C |
|
|
|
|
|
|
|
|
5 |
20 |
30 |
25 |
| Basic D |
|
|
|
|
|
|
|
|
1 |
1 |
1 |
15 |
| Basic E |
|
|
|
|
|
|
|
|
41 |
69 |
69 |
98 |
| Enhanced |
|
|
|
|
|
|
|
|
72 |
80 |
76 |
146 |
| Next Gen |
|
|
|
|
21 |
45 |
51 |
41 |
41 |
41 |
41 |
|
| Pioneer |
32 |
32 |
23 |
19 |
9 |
|
|
|
|
|
|
|
| Direct Contracting Entities |
|
|
|
|
|
|
|
|
|
|
53 |
99 |
|
