Medicare Advantage in Colfax County, New Mexico
1,807 people in Colfax County, New Mexico were enrolled in Medicare Advantage in October 2026, 46.4% of 3,894 eligible beneficiaries (+1.4 pts since October 2025). Humana Inc. is the largest parent organization with 42% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,375 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 113 members here are in plans that terminate or leave the county. MA plans offered go from 13 to 7.
Parent organizations in Colfax County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 745 | +1 | 41.9% |
| UnitedHealth Group, Inc. | 673 | +59 | 37.9% |
| Health Care Service Corporation | 209 | +3 | 11.8% |
| Presbyterian Healthcare Services | 122 | −9 | 6.9% |
| CVS Health Corporation | 16 | 0 | 0.9% |
| UMWA Health and Retirement Funds | 13 | −1 | 0.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 511 beneficiaries in Colfax County were assigned to 28 Medicare Shared Savings Program ACOs, 36.3% of assignable Original Medicare beneficiaries. Together, roughly 66% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.