Medicare Advantage in Sumner County, Tennessee
23,158 people in Sumner County, Tennessee were enrolled in Medicare Advantage in October 2026, 53.6% of 43,185 eligible beneficiaries (−0.8 pts since October 2025). Health Care Service Corporation is the largest parent organization with 39% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 2,535 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,313 members here are in plans that terminate or leave the county, and Centene Corporation leaves. MA plans offered go from 41 to 37.
Parent organizations in Sumner County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Health Care Service Corporation | 9,040 | +372 | 39.2% |
| BlueCross BlueShield of Tennessee | 5,431 | +375 | 23.6% |
| UnitedHealth Group, Inc. | 3,770 | −852 | 16.4% |
| Humana Inc. | 2,899 | +484 | 12.6% |
| Elevance Health, Inc. | 649 | −41 | 2.8% |
| CVS Health Corporation | 485 | −97 | 2.1% |
| Devoted Health, Inc. | 283 | +109 | 1.2% |
| Centene Corporation | 267 | +1 | 1.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 118 | +4 | 0.5% |
| BrightSpring Health Services, Inc. | 44 | +24 | 0.2% |
| Zing Health Consolidator, Inc | 42 | new | 0.2% |
| Missouri Healthcare Advisors, LLC | 20 | −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, 5,650 beneficiaries in Sumner County were assigned to 118 Medicare Shared Savings Program ACOs, 43.4% of assignable Original Medicare beneficiaries. Together, roughly 74% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.