Medicare Advantage in Baltimore County, Maryland
45,681 people in Baltimore County, Maryland were enrolled in Medicare Advantage in October 2026, 25.7% of 177,440 eligible beneficiaries (−0.5 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 20% of reported enrollment; 13 parent organizations have 11 or more members and the HHI is 1,389 (moderately concentrated). For 2027, 1,463 members here are in plans that terminate or leave the county. MA plans offered go from 23 to 17.
Parent organizations in Baltimore County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 9,040 | −74 | 19.9% |
| CVS Health Corporation | 7,978 | −3,787 | 17.6% |
| UnitedHealth Group, Inc. | 7,488 | −374 | 16.5% |
| CareFirst, Inc. | 5,166 | +2,012 | 11.4% |
| Johns Hopkins Healthcare LLC | 4,908 | +236 | 10.8% |
| Health Care Service Corporation | 3,754 | +65 | 8.3% |
| Humana Inc. | 3,619 | +1,016 | 8.0% |
| LifeBridge Health, Inc. | 2,674 | +949 | 5.9% |
| Elevance Health, Inc. | 548 | −25 | 1.2% |
| ISNP Holdings, LLC | 136 | +13 | 0.3% |
| Highmark Health | 59 | 0 | 0.1% |
| The Johns Hopkins Health System Corporation | 55 | +1 | 0.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 20 | −4 | 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, 11,057 beneficiaries in Baltimore County were assigned to 185 Medicare Shared Savings Program ACOs, 11.6% of assignable Original Medicare beneficiaries. Together, roughly 34% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.