Medicare Advantage in Hamilton County, Tennessee
47,100 people in Hamilton County, Tennessee were enrolled in Medicare Advantage in October 2026, 56.6% of 83,247 eligible beneficiaries (+0.5 pts since October 2025). BlueCross BlueShield of Tennessee is the largest parent organization with 50% of reported enrollment; 11 parent organizations have 11 or more members and the HHI is 3,188 (highly concentrated). For 2027, 2,314 members here are in plans that terminate or leave the county, and Centene Corporation leaves. MA plans offered go from 39 to 36.
Parent organizations in Hamilton County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| BlueCross BlueShield of Tennessee | 23,266 | +1,339 | 49.6% |
| UnitedHealth Group, Inc. | 9,395 | −201 | 20.0% |
| Humana Inc. | 7,723 | +190 | 16.5% |
| Health Care Service Corporation | 3,222 | −146 | 6.9% |
| Elevance Health, Inc. | 1,306 | −43 | 2.8% |
| Devoted Health, Inc. | 851 | +355 | 1.8% |
| CVS Health Corporation | 449 | −150 | 1.0% |
| Centene Corporation | 308 | −12 | 0.7% |
| Ascension Health Alliance | 254 | +4 | 0.5% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 118 | +5 | 0.3% |
| Missouri Healthcare Advisors, LLC | 49 | −1 | 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, 18,695 beneficiaries in Hamilton County were assigned to 151 Medicare Shared Savings Program ACOs, 69.2% 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.