Medicare Advantage in Knox County, Tennessee
53,574 people in Knox County, Tennessee were enrolled in Medicare Advantage in October 2026, 53.6% of 99,914 eligible beneficiaries (−0.05 pts since October 2025). Humana Inc. is the largest parent organization with 54% of reported enrollment; 13 parent organizations have 11 or more members and the HHI is 3,742 (highly concentrated). For 2027, 2,270 members here are in plans that terminate or leave the county, and Centene Corporation leaves. MA plans offered go from 36 to 38.
Parent organizations in Knox County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 29,005 | +727 | 54.3% |
| UnitedHealth Group, Inc. | 12,559 | −487 | 23.5% |
| BlueCross BlueShield of Tennessee | 8,140 | +557 | 15.2% |
| Elevance Health, Inc. | 1,027 | −25 | 1.9% |
| Health Care Service Corporation | 857 | −79 | 1.6% |
| Devoted Health, Inc. | 619 | +243 | 1.2% |
| CVS Health Corporation | 514 | +7 | 1.0% |
| Centene Corporation | 392 | −65 | 0.7% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 162 | −18 | 0.3% |
| Missouri Healthcare Advisors, LLC | 103 | +3 | 0.2% |
| Highmark Health | 17 | +4 | under 0.1% |
| UMWA Health and Retirement Funds | 13 | 0 | under 0.1% |
| Mitchell Family Office | 12 | −2 | 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, 6,348 beneficiaries in Knox County were assigned to 166 Medicare Shared Savings Program ACOs, 18.6% of assignable Original Medicare beneficiaries. Together, roughly 62% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.