Medicare Advantage in Lamar County, Mississippi
4,648 people in Lamar County, Mississippi were enrolled in Medicare Advantage in October 2026, 41.7% of 11,143 eligible beneficiaries (+0.3 pts since October 2025). Humana Inc. is the largest parent organization with 54% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 4,023 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 14 members here are in plans that terminate or leave the county. MA plans offered go from 22 to 26.
Parent organizations in Lamar County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 2,473 | +217 | 53.6% |
| Health Care Service Corporation | 1,521 | +127 | 32.9% |
| Centene Corporation | 268 | +50 | 5.8% |
| UnitedHealth Group, Inc. | 265 | −210 | 5.7% |
| CVS Health Corporation | 45 | 0 | 1.0% |
| Elevance Health, Inc. | 45 | −1 | 1.0% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 3,669 beneficiaries in Lamar County were assigned to 32 Medicare Shared Savings Program ACOs, 71.6% of assignable Original Medicare beneficiaries. Together, roughly 83% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.