Medicare Advantage in Aroostook County, Maine
11,389 people in Aroostook County, Maine were enrolled in Medicare Advantage in October 2026, 53.5% of 21,307 eligible beneficiaries (−0.2 pts since October 2025). Centene Corporation is the largest parent organization with 42% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 2,554 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 3,304 members here are in plans that terminate or leave the county. MA plans offered go from 19 to 13.
Parent organizations in Aroostook County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Centene Corporation | 4,772 | +269 | 42.1% |
| UnitedHealth Group, Inc. | 2,056 | +410 | 18.1% |
| Martin's Point Health Care, Inc. | 1,534 | −259 | 13.5% |
| Elevance Health, Inc. | 1,360 | −178 | 12.0% |
| CVS Health Corporation | 1,218 | +107 | 10.7% |
| Humana Inc. | 400 | −266 | 3.5% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 2,957 beneficiaries in Aroostook County were assigned to 39 Medicare Shared Savings Program ACOs, 39.5% of assignable Original Medicare beneficiaries. Together, roughly 72% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.