Medicare Advantage in Sullivan County, Tennessee
31,088 people in Sullivan County, Tennessee were enrolled in Medicare Advantage in October 2026, 68.4% of 45,477 eligible beneficiaries (+0.01 pts since October 2025). BlueCross BlueShield of Tennessee is the largest parent organization with 41% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 3,256 (highly concentrated). For 2027, 1,227 members here are in plans that terminate or leave the county, and Centene Corporation leaves. MA plans offered go from 30 to 32.
Parent organizations in Sullivan County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| BlueCross BlueShield of Tennessee | 12,611 | +993 | 40.7% |
| UnitedHealth Group, Inc. | 10,173 | −1,125 | 32.8% |
| Humana Inc. | 7,047 | +433 | 22.7% |
| Elevance Health, Inc. | 428 | +36 | 1.4% |
| Devoted Health, Inc. | 305 | +97 | 1.0% |
| CVS Health Corporation | 239 | −7 | 0.8% |
| Centene Corporation | 102 | −2 | 0.3% |
| UMWA Health and Retirement Funds | 45 | −9 | 0.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 34 | −5 | 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, 5,742 beneficiaries in Sullivan County were assigned to 95 Medicare Shared Savings Program ACOs, 56.2% of assignable Original Medicare beneficiaries. Together, roughly 86% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.