Medicare Advantage in Walla Walla County, Washington
4,972 people in Walla Walla County, Washington were enrolled in Medicare Advantage in October 2026, 33.0% of 15,049 eligible beneficiaries (+0.03 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 45% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 3,538 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,350 members here are in plans that terminate or leave the county, and Providence St Joseph Health leaves. MA plans offered go from 15 to 9.
Parent organizations in Walla Walla County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 2,220 | −201 | 45.0% |
| Humana Inc. | 1,855 | +527 | 37.6% |
| Providence St Joseph Health | 420 | +29 | 8.5% |
| Community Health Plan of Washington | 163 | −127 | 3.3% |
| Molina Healthcare, Inc. | 107 | −3 | 2.2% |
| CVS Health Corporation | 78 | +1 | 1.6% |
| Centene Corporation | 73 | −108 | 1.5% |
| Elevance Health, Inc. | 13 | −1 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 6,261 beneficiaries in Walla Walla County were assigned to 54 Medicare Shared Savings Program ACOs, 80.8% of assignable Original Medicare beneficiaries. Together, roughly 87% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.