Medicare Advantage in Suffolk County, Massachusetts
48,823 people in Suffolk County, Massachusetts were enrolled in Medicare Advantage in October 2026, 41.9% of 116,539 eligible beneficiaries (−1.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 29% of reported enrollment; 19 parent organizations have 11 or more members and the HHI is 1,755 (moderately concentrated). For 2027, 7,706 members here are in plans that terminate or leave the county. MA plans offered go from 36 to 33.
Parent organizations in Suffolk County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 14,222 | −1,773 | 29.4% |
| Point32Health, Inc. | 11,408 | −8 | 23.5% |
| CareSource | 5,884 | +79 | 12.1% |
| CVS Health Corporation | 3,266 | −1,115 | 6.7% |
| Blue Cross and Blue Shield of Massachusetts, Inc. | 3,202 | −429 | 6.6% |
| Mass General Brigham Incorporated | 3,134 | +2,172 | 6.5% |
| Molina Healthcare, Inc. | 3,026 | +153 | 6.2% |
| Humana Inc. | 1,957 | +733 | 4.0% |
| NEIGHBORHEALTH CORPORATION | 752 | +11 | 1.6% |
| Eternal Health of Delaware, Inc. | 601 | +419 | 1.2% |
| Fallon Community Health Plan, Inc. | 284 | +94 | 0.6% |
| Uphams Corner Health Committee, Inc. | 272 | −8 | 0.6% |
| Harbor Health Services, Inc. | 151 | −20 | 0.3% |
| Element Care, Inc. | 90 | +20 | 0.2% |
| Serenity Care, Inc. | 66 | +21 | 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 33,602 beneficiaries in Suffolk County were assigned to 113 Medicare Shared Savings Program ACOs, 75.2% of assignable Original Medicare beneficiaries. Together, roughly 86% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.