Medicare Advantage in Fairfax County, Virginia
59,787 people in Fairfax County, Virginia were enrolled in Medicare Advantage in October 2026, 31.7% of 188,534 eligible beneficiaries (−0.1 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 29% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 2,191 (highly concentrated). For 2027, 2,826 members here are in plans that terminate or leave the county. MA plans offered go from 29 to 25.
Parent organizations in Fairfax County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 17,131 | +912 | 28.7% |
| UnitedHealth Group, Inc. | 14,957 | −939 | 25.1% |
| Humana Inc. | 11,927 | +4,236 | 20.0% |
| CVS Health Corporation | 9,541 | −1,447 | 16.0% |
| Elevance Health, Inc. | 5,262 | −1,082 | 8.8% |
| Johns Hopkins Healthcare LLC | 371 | new | 0.6% |
| Sentara Health Care (SHC) | 193 | −153 | 0.3% |
| CareFirst, Inc. | 98 | −33 | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 54 | +3 | under 0.1% |
| Highmark Health | 30 | +2 | under 0.1% |
| Health Care Service Corporation | 24 | −219 | under 0.1% |
| Valir PACE Virginia, LLC | 16 | 0 | 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, 36,073 beneficiaries in Fairfax County were assigned to 259 Medicare Shared Savings Program ACOs, 47.6% of assignable Original Medicare beneficiaries. Together, roughly 64% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.