MSSP ACO Explorer / All ACOs / Mass General Brigham ACO, LLC
Mass General Brigham ACO, LLC
Mass General Brigham ACO, LLC (A4641) is a Medicare Shared Savings Program ACO based in Massachusetts, in the ENHANCED track. In PY 2024 it had 147,747 assigned beneficiaries, spent 2.4% below its benchmark, and earned $39.2M in shared savings, with a quality score of 82.8. It appears in 6 performance years of CMS results, from 2019 to 2024.
2.4%savings rate, PY 2024 (median ACO 4.2%)
$39.2Mearned shared savings, PY 2024
82.8quality score, PY 2024 (median 83.1)
147,747assigned beneficiaries, PY 2024
Results by performance year
| Year | Track | Assigned | Savings rate | Benchmark minus spending | Earned savings or losses | Quality |
|---|---|---|---|---|---|---|
| 2024 | ENHANCED | 147,747 | 2.4% | $53.3M | $39.2M | 82.8 |
| 2023 | ENHANCED | 143,762 | 2.4% | $49.3M | $36.2M | 86.0 |
| 2022 | ENHANCED | 131,430 | 1.3% | $23.1M | $0 | 80.9 |
| 2021 | ENHANCED | 126,357 | 1.1% | $18.4M | $0 | 82.1 |
| 2020 | ENHANCED | 126,420 | 4.5% | $64.3M | $46.7M | 96.9 |
| 2019 July to December 2019 (6 months) | ENHANCED | 121,891 | 1.9% | $14.7M | $0 | 100.0 |
Savings rate is benchmark minus expenditures over benchmark, as CMS defines it. Quality scores before and after PY 2021 are on different scales.
Where its beneficiaries live
In PY 2024, Mass General Brigham ACO, LLC had assigned beneficiaries in 569 counties. The ten largest:
| County | Assigned beneficiaries | Share of the ACO |
|---|---|---|
| Middlesex, MA | 33,353 | 22.6% |
| Essex, MA | 27,385 | 18.6% |
| Norfolk, MA | 20,629 | 14.0% |
| Suffolk, MA | 13,782 | 9.3% |
| Plymouth, MA | 10,590 | 7.2% |
| Worcester, MA | 6,997 | 4.7% |
| Strafford, NH | 5,443 | 3.7% |
| Hampshire, MA | 4,944 | 3.4% |
| Dukes, MA | 3,344 | 2.3% |
| Rockingham, NH | 3,168 | 2.1% |
CMS suppresses county counts of 1 to 10. Open the full footprint map in the explorer.