Medicare Advantage in Lewis County, Washington
13,199 people in Lewis County, Washington were enrolled in Medicare Advantage in October 2026, 56.4% of 23,388 eligible beneficiaries (+0.7 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 76% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 5,977 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 3,741 members here are in plans that terminate or leave the county. MA plans offered go from 21 to 19.
Parent organizations in Lewis County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 10,014 | +164 | 76.2% |
| Kaiser Foundation Health Plan, Inc. | 1,407 | −97 | 10.7% |
| Humana Inc. | 964 | +230 | 7.3% |
| Centene Corporation | 318 | +44 | 2.4% |
| Molina Healthcare, Inc. | 153 | +16 | 1.2% |
| CVS Health Corporation | 130 | −4 | 1.0% |
| Elevance Health, Inc. | 68 | +19 | 0.5% |
| Community Health Plan of Washington | 53 | −18 | 0.4% |
| Cambia Health Solutions, Inc. | 42 | −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, 2,560 beneficiaries in Lewis County were assigned to 54 Medicare Shared Savings Program ACOs, 37.0% of assignable Original Medicare beneficiaries. Together, roughly 73% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.