Table 1.
Characteristics of Surveyed and Interviewed Medicare ACOs
| Medicare NSACO respondents | Outreach sample for interview | Interview sample | |
|---|---|---|---|
| Payer Mix | n = 297 | n = 50 | n = 18 |
| Any private payer contract | 48% | 42% | 67% |
| Any Medicaid contract | 18% (n = 289) | 20% | 33% |
| Only Medicare contract | 44% | 54% | 28% |
| Contract with > 1 payer | 56% | 46% | 72% |
| Composition | n = 263 | n = 50 | n = 18 |
| Mean (SD) number of PCPs | 139 (153) | 187 (197) | 189 (157) |
| Mean (SD) number of specialists | 294 (472) | 353 (447) | 388 (508) |
| Mean (SD) number of attributed beneficiaries | 16,237 (14,438) | 21,003 (22,153) | 19,185 (15,126) |
| Beneficiary:PCP ratio (SD) | 167 (105) | 113 (115) | 142 (85) |
| Mean (SD) number of facilities | 5.0 (15) | 5.4 (18) | 6.6 (12) |
| Number with a hospital | 57% (n = 278) | 42% | 56% |
| Region | n = 283 | n = 50 | n = 18 |
| Northeast | 24% | 16% | 33% |
| South | 37% | 50% | 33% |
| Midwest | 23% | 18% | 22% |
| West | 15% | 16% | 11% |
| Performance—Medicare | |||
| Achieved savings year 1 | 25% (n = 234) | 58% (n = 45) | 53% (n = 15) |
| Achieved savings year 2 | 31% (n = 225) | 58% (n = 45) | 60% (n = 15) |
| Achieved savings year 3 | 40% (n = 151) | 78% (n = 32) | 70% (n = 10) |
| Mean (SD) 2015 quality score | 92 (9) (n = 207) | 93 (6) (n = 44) | 95 (3) (n = 15) |
The number of ACOs included in each row varies depending on data availability
NSACO National Survey of Accountable Care Organizations, PCP primary care provider, SD standard deviation