Medicare Advantage in Plumas County, California
639 people in Plumas County, California were enrolled in Medicare Advantage in October 2026, 10.2% of 6,291 eligible beneficiaries (−1.4 pts since October 2025). Humana Inc. is the largest parent organization with 39% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,641 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 4 to 4.
Parent organizations in Plumas County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 240 | +81 | 39.3% |
| UnitedHealth Group, Inc. | 182 | +11 | 29.8% |
| Imperial Health Plan of California | 64 | +41 | 10.5% |
| California Physicians' Service | 40 | +5 | 6.6% |
| Elevance Health, Inc. | 28 | −134 | 4.6% |
| Cambia Health Solutions, Inc. | 20 | −4 | 3.3% |
| CVS Health Corporation | 19 | −80 | 3.1% |
| Kaiser Foundation Health Plan, Inc. | 17 | 0 | 2.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 167 beneficiaries in Plumas County were assigned to 31 Medicare Shared Savings Program ACOs, 3.9% of assignable Original Medicare beneficiaries. Together, roughly 14% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.