Medicare Advantage in Ontario County, New York
22,182 people in Ontario County, New York were enrolled in Medicare Advantage in October 2026, 72.4% of 30,649 eligible beneficiaries (−0.5 pts since October 2025). Lifetime Healthcare, Inc. is the largest parent organization with 71% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 5,249 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 471 members here are in plans that terminate or leave the county, and Humana Inc. leaves. MA plans offered go from 20 to 15.
Parent organizations in Ontario County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Lifetime Healthcare, Inc. | 15,702 | +3,071 | 71.0% |
| UnitedHealth Group, Inc. | 2,120 | −2,739 | 9.6% |
| CVS Health Corporation | 1,775 | +787 | 8.0% |
| Centene Corporation | 1,153 | +164 | 5.2% |
| MVP Health Care, Inc. | 1,102 | −964 | 5.0% |
| Elderplan, Inc. | 92 | +16 | 0.4% |
| Humana Inc. | 79 | +21 | 0.4% |
| Rochester Regional Health | 46 | +6 | 0.2% |
| Elevance Health, Inc. | 35 | −5 | 0.2% |
| Highmark Health | 12 | −2 | 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, 1,291 beneficiaries in Ontario County were assigned to 70 Medicare Shared Savings Program ACOs, 25.8% of assignable Original Medicare beneficiaries. Together, roughly 79% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.