Medicare Advantage in Harrison County, Mississippi
23,754 people in Harrison County, Mississippi were enrolled in Medicare Advantage in October 2026, 50.2% of 47,308 eligible beneficiaries (+0.8 pts since October 2025). Humana Inc. is the largest parent organization with 58% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 3,698 (highly concentrated). For 2027, 878 members here are in plans that terminate or leave the county, and BlueCross BlueShield of Alabama leaves. MA plans offered go from 34 to 36.
Parent organizations in Harrison County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 13,665 | +1,247 | 57.8% |
| UnitedHealth Group, Inc. | 3,139 | −270 | 13.3% |
| Devoted Health, Inc. | 2,192 | +1,562 | 9.3% |
| CVS Health Corporation | 1,945 | −1,195 | 8.2% |
| Centene Corporation | 735 | +174 | 3.1% |
| BlueCross BlueShield of Alabama | 711 | −243 | 3.0% |
| Health Care Service Corporation | 647 | −191 | 2.7% |
| Elevance Health, Inc. | 521 | +13 | 2.2% |
| Mitchell Family Office | 32 | −3 | 0.1% |
| Singh Holdings LLC | 31 | new | 0.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 22 | −4 | under 0.1% |
| Louisiana Health Service & Indemnity Company | 13 | new | 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, 11,434 beneficiaries in Harrison County were assigned to 129 Medicare Shared Savings Program ACOs, 72.0% 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.