Medicare Advantage in Grainger County, Tennessee
4,758 people in Grainger County, Tennessee were enrolled in Medicare Advantage in October 2026, 69.0% of 6,891 eligible beneficiaries (+1.0 pts since October 2025). Humana Inc. is the largest parent organization with 44% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 3,282 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 220 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 Grainger County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 2,096 | +96 | 44.4% |
| UnitedHealth Group, Inc. | 1,516 | −39 | 32.1% |
| BlueCross BlueShield of Tennessee | 779 | +93 | 16.5% |
| Elevance Health, Inc. | 94 | 0 | 2.0% |
| Health Care Service Corporation | 59 | −1 | 1.2% |
| Centene Corporation | 45 | −13 | 1.0% |
| Devoted Health, Inc. | 45 | +19 | 1.0% |
| CVS Health Corporation | 41 | +1 | 0.9% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 25 | 0 | 0.5% |
| UMWA Health and Retirement Funds | 22 | −1 | 0.5% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 402 beneficiaries in Grainger County were assigned to 29 Medicare Shared Savings Program ACOs, 23.4% of assignable Original Medicare beneficiaries. Together, roughly 76% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.