Medicare Advantage in Penobscot County, Maine
24,152 people in Penobscot County, Maine were enrolled in Medicare Advantage in October 2026, 58.4% of 41,351 eligible beneficiaries (−0.4 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 27% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 2,021 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 8,649 members here are in plans that terminate or leave the county. MA plans offered go from 21 to 18.
Parent organizations in Penobscot County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 6,408 | +1,533 | 26.6% |
| Martin's Point Health Care, Inc. | 5,881 | −904 | 24.4% |
| Centene Corporation | 4,443 | +453 | 18.5% |
| Elevance Health, Inc. | 3,365 | −582 | 14.0% |
| CVS Health Corporation | 3,097 | +21 | 12.9% |
| Humana Inc. | 877 | −311 | 3.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 5,742 beneficiaries in Penobscot County were assigned to 86 Medicare Shared Savings Program ACOs, 51.0% of assignable Original Medicare beneficiaries. Together, roughly 80% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.