Medicare Advantage in Jefferson County, Washington
2,637 people in Jefferson County, Washington were enrolled in Medicare Advantage in October 2026, 17.0% of 15,468 eligible beneficiaries (+0.9 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 42% of reported enrollment; 11 parent organizations have 11 or more members and the HHI is 2,457 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 749 members here are in plans that terminate or leave the county. MA plans offered go from 17 to 12.
Parent organizations in Jefferson County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,095 | −20 | 42.3% |
| Devoted Health, Inc. | 480 | +205 | 18.6% |
| Humana Inc. | 292 | +39 | 11.3% |
| CVS Health Corporation | 252 | +5 | 9.7% |
| Centene Corporation | 218 | −10 | 8.4% |
| Elevance Health, Inc. | 99 | −7 | 3.8% |
| Molina Healthcare, Inc. | 79 | +6 | 3.1% |
| Community Health Plan of Washington | 29 | −41 | 1.1% |
| California Physicians' Service | 19 | 0 | 0.7% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 12 | 0 | 0.5% |
| Kaiser Foundation Health Plan, Inc. | 11 | −1 | 0.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 9,198 beneficiaries in Jefferson County were assigned to 68 Medicare Shared Savings Program ACOs, 89.1% of assignable Original Medicare beneficiaries. Together, roughly 91% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.