Medicare Advantage in Grays Harbor County, Washington
5,367 people in Grays Harbor County, Washington were enrolled in Medicare Advantage in October 2026, 23.7% of 22,654 eligible beneficiaries (+0.5 pts since October 2025). Centene Corporation is the largest parent organization with 51% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 3,012 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,456 members here are in plans that terminate or leave the county. MA plans offered go from 7 to 4.
Parent organizations in Grays Harbor County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Centene Corporation | 2,706 | +247 | 51.2% |
| Elevance Health, Inc. | 675 | −86 | 12.8% |
| Kaiser Foundation Health Plan, Inc. | 442 | −27 | 8.4% |
| UnitedHealth Group, Inc. | 420 | +29 | 7.9% |
| Molina Healthcare, Inc. | 326 | +12 | 6.2% |
| Humana Inc. | 325 | +8 | 6.1% |
| CVS Health Corporation | 191 | +7 | 3.6% |
| Cambia Health Solutions, Inc. | 130 | −12 | 2.5% |
| Community Health Plan of Washington | 72 | −5 | 1.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 4,309 beneficiaries in Grays Harbor County were assigned to 53 Medicare Shared Savings Program ACOs, 35.9% of assignable Original Medicare beneficiaries. Together, roughly 51% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.