Medicare Advantage in Tuolumne County, California
1,684 people in Tuolumne County, California were enrolled in Medicare Advantage in October 2026, 10.0% of 16,760 eligible beneficiaries (−2.9 pts since October 2025). Elevance Health, Inc. is the largest parent organization with 27% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 1,972 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 219 members here are in plans that terminate or leave the county, and Kaiser Foundation Health Plan, Inc. leaves. MA plans offered go from 2 to 2.
Parent organizations in Tuolumne County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Elevance Health, Inc. | 434 | −416 | 26.8% |
| Imperial Health Plan of California | 362 | +240 | 22.3% |
| UnitedHealth Group, Inc. | 306 | +8 | 18.9% |
| California Physicians' Service | 295 | +7 | 18.2% |
| Kaiser Foundation Health Plan, Inc. | 103 | −18 | 6.4% |
| Centene Corporation | 70 | +44 | 4.3% |
| CVS Health Corporation | 51 | −335 | 3.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 627 beneficiaries in Tuolumne County were assigned to 52 Medicare Shared Savings Program ACOs, 6.0% of assignable Original Medicare beneficiaries. Together, roughly 15% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.