Medicare Advantage in San Juan County, Washington
1,139 people in San Juan County, Washington were enrolled in Medicare Advantage in October 2026, 16.7% of 6,805 eligible beneficiaries (−1.0 pts since October 2025). Centene Corporation is the largest parent organization with 34% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 2,635 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 392 members here are in plans that terminate or leave the county. MA plans offered go from 7 to 4.
Parent organizations in San Juan County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Centene Corporation | 371 | −101 | 34.4% |
| Humana Inc. | 308 | +52 | 28.6% |
| UnitedHealth Group, Inc. | 253 | −33 | 23.5% |
| CVS Health Corporation | 89 | +10 | 8.3% |
| Elevance Health, Inc. | 38 | +1 | 3.5% |
| Molina Healthcare, Inc. | 19 | −6 | 1.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,104 beneficiaries in San Juan County were assigned to 56 Medicare Shared Savings Program ACOs, 29.2% of assignable Original Medicare beneficiaries. Together, roughly 41% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.