Medicare Advantage in Costilla County, Colorado
774 people in Costilla County, Colorado were enrolled in Medicare Advantage in October 2026, 54.8% of 1,413 eligible beneficiaries (−1.1 pts since October 2025). Humana Inc. is the largest parent organization with 41% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 3,429 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 129 members here are in plans that terminate or leave the county. MA plans offered go from 11 to 9.
Parent organizations in Costilla County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 312 | −90 | 41.3% |
| UnitedHealth Group, Inc. | 224 | −120 | 29.7% |
| Devoted Health, Inc. | 219 | new | 29.0% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 169 beneficiaries in Costilla County were assigned to 18 Medicare Shared Savings Program ACOs, 46.5% of assignable Original Medicare beneficiaries. Together, roughly 76% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.