Medicare Advantage in Cowlitz County, Washington
19,689 people in Cowlitz County, Washington were enrolled in Medicare Advantage in October 2026, 66.8% of 29,492 eligible beneficiaries (+0.2 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 38% of reported enrollment; 11 parent organizations have 11 or more members and the HHI is 3,270 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 4,006 members here are in plans that terminate or leave the county, and Health Care Service Corporation, Elevance Health, Inc. leave. MA plans offered go from 32 to 21.
Parent organizations in Cowlitz County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 7,547 | −6 | 38.5% |
| UnitedHealth Group, Inc. | 7,430 | −935 | 37.9% |
| Humana Inc. | 3,673 | +1,417 | 18.7% |
| Devoted Health, Inc. | 415 | +279 | 2.1% |
| Molina Healthcare, Inc. | 225 | −18 | 1.1% |
| Centene Corporation | 93 | +6 | 0.5% |
| Cambia Health Solutions, Inc. | 75 | −16 | 0.4% |
| CVS Health Corporation | 47 | −218 | 0.2% |
| Elevance Health, Inc. | 42 | +5 | 0.2% |
| Community Health Plan of Washington | 38 | −21 | 0.2% |
| Health Care Service Corporation | 37 | −105 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 344 beneficiaries in Cowlitz County were assigned to 51 Medicare Shared Savings Program ACOs, 5.8% of assignable Original Medicare beneficiaries. Together, roughly 69% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.