Medicare Advantage in Merrimack County, New Hampshire
15,171 people in Merrimack County, New Hampshire were enrolled in Medicare Advantage in October 2026, 36.7% of 41,286 eligible beneficiaries (−2.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 36% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,154 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 1,063 members here are in plans that terminate or leave the county, and BMC Health System, Inc. leaves. MA plans offered go from 11 to 11.
Parent organizations in Merrimack County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 5,506 | +683 | 36.5% |
| Humana Inc. | 4,910 | +3,434 | 32.5% |
| Elevance Health, Inc. | 4,157 | −1,797 | 27.5% |
| CVS Health Corporation | 320 | −306 | 2.1% |
| BMC Health System, Inc. | 179 | −1,037 | 1.2% |
| Health Care Service Corporation | 21 | new | 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, 10,944 beneficiaries in Merrimack County were assigned to 95 Medicare Shared Savings Program ACOs, 65.2% of assignable Original Medicare beneficiaries. Together, roughly 78% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.