Medicare Advantage in Johnson County, Iowa
8,570 people in Johnson County, Iowa were enrolled in Medicare Advantage in October 2026, 32.8% of 26,144 eligible beneficiaries (−1.9 pts since October 2025). CVS Health Corporation is the largest parent organization with 37% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 2,448 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,026 members here are in plans that terminate or leave the county, and Blue Cross Blue Shield of Michigan Mutual Ins. Co., Molina Healthcare, Inc. leave. MA plans offered go from 17 to 16.
Parent organizations in Johnson County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 3,179 | +925 | 37.4% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 1,748 | +167 | 20.6% |
| UnitedHealth Group, Inc. | 1,706 | −1,087 | 20.1% |
| Humana Inc. | 1,135 | +129 | 13.3% |
| Centene Corporation | 584 | +377 | 6.9% |
| Elevance Health, Inc. | 96 | −47 | 1.1% |
| Mitchell Family Office | 30 | +13 | 0.4% |
| Molina Healthcare, Inc. | 17 | new | 0.2% |
| Health Care Service Corporation | 11 | −1 | 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, 1,196 beneficiaries in Johnson County were assigned to 76 Medicare Shared Savings Program ACOs, 10.0% of assignable Original Medicare beneficiaries. Together, roughly 40% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.