Medicare Advantage in Marion County, Mississippi
3,236 people in Marion County, Mississippi were enrolled in Medicare Advantage in October 2026, 52.2% of 6,205 eligible beneficiaries (+0.8 pts since October 2025). Humana Inc. is the largest parent organization with 62% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 4,288 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 31 to 34.
Parent organizations in Marion County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 1,979 | +216 | 61.5% |
| Health Care Service Corporation | 611 | +54 | 19.0% |
| UnitedHealth Group, Inc. | 297 | −189 | 9.2% |
| Centene Corporation | 232 | +38 | 7.2% |
| CVS Health Corporation | 75 | −5 | 2.3% |
| Mitchell Family Office | 23 | −1 | 0.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,211 beneficiaries in Marion County were assigned to 19 Medicare Shared Savings Program ACOs, 49.0% 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.