Medicare Advantage in Arlington County, Virginia
8,550 people in Arlington County, Virginia were enrolled in Medicare Advantage in October 2026, 29.7% of 28,764 eligible beneficiaries (+0.3 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 32% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,298 (highly concentrated). For 2027, 389 members here are in plans that terminate or leave the county. MA plans offered go from 34 to 35.
Parent organizations in Arlington County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 2,687 | −227 | 31.7% |
| Kaiser Foundation Health Plan, Inc. | 2,176 | +87 | 25.7% |
| Humana Inc. | 1,677 | +650 | 19.8% |
| Elevance Health, Inc. | 949 | +19 | 11.2% |
| CVS Health Corporation | 889 | −241 | 10.5% |
| Sentara Health Care (SHC) | 29 | −21 | 0.3% |
| Valir PACE Virginia, LLC | 29 | +18 | 0.3% |
| Johns Hopkins Healthcare LLC | 27 | new | 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, 4,854 beneficiaries in Arlington County were assigned to 120 Medicare Shared Savings Program ACOs, 41.6% of assignable Original Medicare beneficiaries. Together, roughly 59% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.