Medicare Advantage in Chittenden County, Vermont
3,970 people in Chittenden County, Vermont were enrolled in Medicare Advantage in October 2026, 10.8% of 36,731 eligible beneficiaries (−24.0 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 56% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 4,430 (highly concentrated). For 2027, 0 members here are in plans that terminate or leave the county.
Parent organizations in Chittenden County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 2,201 | −1,455 | 56.3% |
| Health Care Service Corporation | 1,364 | +1,270 | 34.9% |
| CVS Health Corporation | 241 | +17 | 6.2% |
| Humana Inc. | 71 | +36 | 1.8% |
| Elevance Health, Inc. | 32 | +4 | 0.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 255 beneficiaries in Chittenden County were assigned to 91 Medicare Shared Savings Program ACOs, 1.6% of assignable Original Medicare beneficiaries. Together, roughly 12% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.