Medicare Advantage in Larimer County, Colorado
37,583 people in Larimer County, Colorado were enrolled in Medicare Advantage in October 2026, 47.5% of 79,165 eligible beneficiaries (−0.7 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 48% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 3,136 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 4,869 members here are in plans that terminate or leave the county. MA plans offered go from 34 to 24.
Parent organizations in Larimer County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 17,910 | −2,075 | 47.8% |
| Humana Inc. | 9,658 | +3,160 | 25.8% |
| Kaiser Foundation Health Plan, Inc. | 3,902 | +46 | 10.4% |
| CVS Health Corporation | 2,926 | +134 | 7.8% |
| Devoted Health, Inc. | 1,138 | −307 | 3.0% |
| Intermountain Health Care, Inc. | 923 | +642 | 2.5% |
| Elevance Health, Inc. | 419 | +51 | 1.1% |
| Total Community Options, Inc. | 309 | +3 | 0.8% |
| Health Care Service Corporation | 173 | −946 | 0.5% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 79 | −3 | 0.2% |
| Highmark Health | 17 | +2 | under 0.1% |
| California Physicians' Service | 13 | −4 | 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, 16,150 beneficiaries in Larimer County were assigned to 164 Medicare Shared Savings Program ACOs, 56.4% of assignable Original Medicare beneficiaries. Together, roughly 77% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.