Medicare Advantage in Loudoun County, Virginia
18,202 people in Loudoun County, Virginia were enrolled in Medicare Advantage in October 2026, 32.7% of 55,617 eligible beneficiaries (−0.8 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 35% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 2,346 (highly concentrated). For 2027, 1,392 members here are in plans that terminate or leave the county. MA plans offered go from 31 to 27.
Parent organizations in Loudoun County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 6,408 | +809 | 35.4% |
| Humana Inc. | 3,778 | +1,583 | 20.9% |
| Kaiser Foundation Health Plan, Inc. | 3,523 | +162 | 19.5% |
| CVS Health Corporation | 2,583 | −371 | 14.3% |
| Elevance Health, Inc. | 1,585 | −482 | 8.8% |
| Johns Hopkins Healthcare LLC | 98 | new | 0.5% |
| Sentara Health Care (SHC) | 61 | −81 | 0.3% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 35 | +2 | 0.2% |
| Highmark Health | 24 | +4 | 0.1% |
| CareFirst, Inc. | 17 | +3 | 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, 13,536 beneficiaries in Loudoun County were assigned to 169 Medicare Shared Savings Program ACOs, 61.0% of assignable Original Medicare beneficiaries. Together, roughly 74% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.