Medicare Advantage in Thurston County, Washington
37,268 people in Thurston County, Washington were enrolled in Medicare Advantage in October 2026, 52.7% of 70,727 eligible beneficiaries (−0.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 45% of reported enrollment; 14 parent organizations have 11 or more members and the HHI is 3,186 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 5,889 members here are in plans that terminate or leave the county. MA plans offered go from 38 to 32.
Parent organizations in Thurston County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 16,689 | +323 | 44.9% |
| Kaiser Foundation Health Plan, Inc. | 11,800 | −82 | 31.7% |
| Humana Inc. | 3,783 | +774 | 10.2% |
| CVS Health Corporation | 2,644 | −552 | 7.1% |
| Cambia Health Solutions, Inc. | 808 | −247 | 2.2% |
| Centene Corporation | 437 | +34 | 1.2% |
| SCAN Group | 333 | new | 0.9% |
| Molina Healthcare, Inc. | 321 | −12 | 0.9% |
| Elevance Health, Inc. | 186 | +2 | 0.5% |
| Community Health Plan of Washington | 83 | −26 | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 33 | 0 | under 0.1% |
| California Physicians' Service | 19 | −1 | under 0.1% |
| Health Care Service Corporation | 18 | 0 | under 0.1% |
| Providence Health & Services | 13 | −6 | under 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, 8,301 beneficiaries in Thurston County were assigned to 136 Medicare Shared Savings Program ACOs, 40.9% of assignable Original Medicare beneficiaries. Together, roughly 72% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.