Medicare Advantage in Alamosa County, Colorado
1,556 people in Alamosa County, Colorado were enrolled in Medicare Advantage in October 2026, 45.1% of 3,449 eligible beneficiaries (−4.8 pts since October 2025). Humana Inc. is the largest parent organization with 53% of reported enrollment; 2 parent organizations have 11 or more members and the HHI is 5,023 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 1,088 members here are in plans that terminate or leave the county, and Humana Inc. leaves. MA plans offered go from 7 to 0.
Parent organizations in Alamosa County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 815 | −19 | 53.4% |
| UnitedHealth Group, Inc. | 712 | −108 | 46.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 329 beneficiaries in Alamosa County were assigned to 16 Medicare Shared Savings Program ACOs, 29.0% of assignable Original Medicare beneficiaries. Together, roughly 61% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.