Medicare Advantage in Twin Falls County, Idaho
11,046 people in Twin Falls County, Idaho were enrolled in Medicare Advantage in October 2026, 56.1% of 19,690 eligible beneficiaries (−2.7 pts since October 2025). PacificSource is the largest parent organization with 31% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 2,366 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 4,966 members here are in plans that terminate or leave the county, and Humana Inc. leaves. MA plans offered go from 15 to 9.
Parent organizations in Twin Falls County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| PacificSource | 3,368 | +2,380 | 30.6% |
| UnitedHealth Group, Inc. | 3,206 | +263 | 29.1% |
| Gemstone Holdings, Inc. | 2,202 | −3,164 | 20.0% |
| Humana Inc. | 1,052 | +297 | 9.6% |
| Molina Healthcare, Inc. | 1,017 | −20 | 9.2% |
| CVS Health Corporation | 65 | −1 | 0.6% |
| Fenyx Health Holdings, Inc. | 32 | new | 0.3% |
| Elevance Health, Inc. | 29 | −1 | 0.3% |
| Mitchell Family Office | 15 | new | 0.1% |
| California Physicians' Service | 13 | +2 | 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 333 beneficiaries in Twin Falls County were assigned to 42 Medicare Shared Savings Program ACOs, 5.9% of assignable Original Medicare beneficiaries. Together, roughly 59% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.