Medicare Advantage in St. Mary's County, Maryland
3,494 people in St. Mary's County, Maryland were enrolled in Medicare Advantage in October 2026, 16.9% of 20,661 eligible beneficiaries (−0.9 pts since October 2025). Humana Inc. is the largest parent organization with 39% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 3,242 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 963 members here are in plans that terminate or leave the county. MA plans offered go from 8 to 6.
Parent organizations in St. Mary's County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 1,333 | +904 | 38.8% |
| CareFirst, Inc. | 1,297 | +588 | 37.7% |
| UnitedHealth Group, Inc. | 559 | −1,555 | 16.3% |
| CVS Health Corporation | 235 | +13 | 6.8% |
| Elevance Health, Inc. | 12 | 0 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 377 beneficiaries in St. Mary's County were assigned to 69 Medicare Shared Savings Program ACOs, 3.1% of assignable Original Medicare beneficiaries. Together, roughly 20% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.