Medicare Advantage in Williams County, North Dakota
1,216 people in Williams County, North Dakota were enrolled in Medicare Advantage in October 2026, 25.2% of 4,826 eligible beneficiaries (−0.5 pts since October 2025). Medica Holding Company is the largest parent organization with 67% of reported enrollment; 4 parent organizations have 11 or more members and the HHI is 5,398 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 403 members here are in plans that terminate or leave the county, and Blue Cross Blue Shield of Michigan Mutual Ins. Co. leaves. MA plans offered go from 11 to 6.
Parent organizations in Williams County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 800 | +399 | 66.7% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 370 | −369 | 30.8% |
| UnitedHealth Group, Inc. | 18 | +1 | 1.5% |
| CVS Health Corporation | 12 | −3 | 1.0% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 434 beneficiaries in Williams County were assigned to 28 Medicare Shared Savings Program ACOs, 18.4% of assignable Original Medicare beneficiaries. Together, roughly 39% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.