Medicare Advantage in Boulder County, Colorado
31,125 people in Boulder County, Colorado were enrolled in Medicare Advantage in October 2026, 47.5% of 65,504 eligible beneficiaries (−1.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 49% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 3,295 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,658 members here are in plans that terminate or leave the county. MA plans offered go from 42 to 33.
Parent organizations in Boulder County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 15,066 | −1,081 | 48.6% |
| Kaiser Foundation Health Plan, Inc. | 8,571 | +175 | 27.6% |
| Humana Inc. | 3,592 | +1,216 | 11.6% |
| CVS Health Corporation | 1,565 | −55 | 5.0% |
| Devoted Health, Inc. | 1,044 | +338 | 3.4% |
| Intermountain Health Care, Inc. | 461 | +167 | 1.5% |
| TRU Community Care | 272 | +15 | 0.9% |
| Elevance Health, Inc. | 189 | +23 | 0.6% |
| Health Care Service Corporation | 144 | −415 | 0.5% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 83 | −4 | 0.3% |
| Highmark Health | 24 | 0 | under 0.1% |
| Perennial Consortium, LLC | 17 | new | under 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, 16,836 beneficiaries in Boulder County were assigned to 161 Medicare Shared Savings Program ACOs, 75.2% of assignable Original Medicare beneficiaries. Together, roughly 87% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.