Medicare Advantage in San Juan County, New Mexico
9,375 people in San Juan County, New Mexico were enrolled in Medicare Advantage in October 2026, 37.2% of 25,215 eligible beneficiaries (+2.0 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 38% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 3,241 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,298 members here are in plans that terminate or leave the county, and Molina Healthcare, Inc. leaves. MA plans offered go from 11 to 7.
Parent organizations in San Juan County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 3,506 | +1,148 | 37.7% |
| Humana Inc. | 3,458 | +116 | 37.2% |
| Health Care Service Corporation | 1,918 | −571 | 20.6% |
| Presbyterian Healthcare Services | 198 | −15 | 2.1% |
| CVS Health Corporation | 105 | −1 | 1.1% |
| Molina Healthcare, Inc. | 81 | −4 | 0.9% |
| UMWA Health and Retirement Funds | 16 | 0 | 0.2% |
| Elevance Health, Inc. | 11 | 0 | 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, 2,899 beneficiaries in San Juan County were assigned to 64 Medicare Shared Savings Program ACOs, 27.4% of assignable Original Medicare beneficiaries. Together, roughly 54% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.