Medicare Advantage in Somerset County, Maine
9,541 people in Somerset County, Maine were enrolled in Medicare Advantage in October 2026, 60.8% of 15,700 eligible beneficiaries (−0.3 pts since October 2025). Elevance Health, Inc. is the largest parent organization with 30% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 2,115 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 4,893 members here are in plans that terminate or leave the county. MA plans offered go from 15 to 9.
Parent organizations in Somerset County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Elevance Health, Inc. | 2,850 | +399 | 30.0% |
| Martin's Point Health Care, Inc. | 2,215 | +48 | 23.3% |
| UnitedHealth Group, Inc. | 1,934 | +678 | 20.3% |
| Humana Inc. | 1,137 | +334 | 12.0% |
| CVS Health Corporation | 952 | +187 | 10.0% |
| Centene Corporation | 391 | −1,555 | 4.1% |
| Health Care Service Corporation | 29 | +5 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 540 beneficiaries in Somerset County were assigned to 38 Medicare Shared Savings Program ACOs, 14.2% of assignable Original Medicare beneficiaries. Together, roughly 66% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.