Medicare Advantage in Klamath County, Oregon
7,593 people in Klamath County, Oregon were enrolled in Medicare Advantage in October 2026, 39.5% of 19,244 eligible beneficiaries (−1.3 pts since October 2025). ATRIO Health Plans is the largest parent organization with 91% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 8,261 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 280 members here are in plans that terminate or leave the county. MA plans offered go from 8 to 6.
Parent organizations in Klamath County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| ATRIO Health Plans | 6,824 | −140 | 90.7% |
| PacificSource | 350 | +5 | 4.7% |
| UnitedHealth Group, Inc. | 189 | −5 | 2.5% |
| CVS Health Corporation | 56 | −3 | 0.7% |
| Marquis Companies I, Inc. | 36 | +9 | 0.5% |
| Elevance Health, Inc. | 32 | 0 | 0.4% |
| Cambia Health Solutions, Inc. | 17 | +2 | 0.2% |
| California Physicians' Service | 17 | −1 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 4,610 beneficiaries in Klamath County were assigned to 58 Medicare Shared Savings Program ACOs, 62.2% of assignable Original Medicare beneficiaries. Together, roughly 77% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.