Medicare Advantage in Sullivan County, New Hampshire
2,193 people in Sullivan County, New Hampshire were enrolled in Medicare Advantage in October 2026, 17.5% of 12,526 eligible beneficiaries (−16.8 pts since October 2025). Humana Inc. is the largest parent organization with 46% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 2,858 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 406 members here are in plans that terminate or leave the county, and BMC Health System, Inc. leaves. MA plans offered go from 2 to 5.
Parent organizations in Sullivan County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 996 | +938 | 45.9% |
| BMC Health System, Inc. | 407 | +113 | 18.8% |
| Elevance Health, Inc. | 324 | −734 | 14.9% |
| UnitedHealth Group, Inc. | 232 | −1,581 | 10.7% |
| CVS Health Corporation | 159 | −130 | 7.3% |
| Health Care Service Corporation | 38 | new | 1.8% |
| Highmark Health | 12 | −2 | 0.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 2,999 beneficiaries in Sullivan County were assigned to 58 Medicare Shared Savings Program ACOs, 57.6% of assignable Original Medicare beneficiaries. Together, roughly 65% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.