Medicare Advantage in Hamilton County, Indiana
27,872 people in Hamilton County, Indiana were enrolled in Medicare Advantage in October 2026, 42.5% of 65,524 eligible beneficiaries (−0.4 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 39% of reported enrollment; 15 parent organizations have 11 or more members and the HHI is 2,456 (highly concentrated). For 2027, 805 members here are in plans that terminate or leave the county. MA plans offered go from 48 to 44.
Parent organizations in Hamilton County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 10,878 | −243 | 39.2% |
| Humana Inc. | 6,368 | +1,401 | 22.9% |
| Elevance Health, Inc. | 4,804 | −1,457 | 17.3% |
| CVS Health Corporation | 2,315 | −116 | 8.3% |
| Devoted Health, Inc. | 1,014 | new | 3.7% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 730 | +9 | 2.6% |
| SIHO Holding, Inc. | 470 | +270 | 1.7% |
| Centene Corporation | 391 | +14 | 1.4% |
| Zing Health Consolidator, Inc | 382 | +150 | 1.4% |
| Rifkin Managed Care Holding, LLC | 272 | +18 | 1.0% |
| Mitchell Family Office | 56 | +2 | 0.2% |
| Health Care Service Corporation | 30 | +1 | 0.1% |
| SNP Holdings, LLC | 29 | +12 | 0.1% |
| Ascension Health Alliance | 25 | +11 | under 0.1% |
| Highmark Health | 11 | 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, 13,945 beneficiaries in Hamilton County were assigned to 148 Medicare Shared Savings Program ACOs, 54.4% 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.