Medicare Advantage in Navajo County, Arizona
10,849 people in Navajo County, Arizona were enrolled in Medicare Advantage in October 2026, 37.3% of 29,088 eligible beneficiaries (+0.1 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 38% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 2,923 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 189 members here are in plans that terminate or leave the county. MA plans offered go from 11 to 8.
Parent organizations in Navajo County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 4,100 | −633 | 38.2% |
| Humana Inc. | 3,842 | +554 | 35.8% |
| Centene Corporation | 1,079 | +297 | 10.0% |
| Blue Cross Blue Shield of Arizona | 876 | −48 | 8.2% |
| Gold Kidney Health Plan | 336 | +107 | 3.1% |
| UMWA Health and Retirement Funds | 314 | −9 | 2.9% |
| CVS Health Corporation | 114 | +3 | 1.1% |
| Elevance Health, Inc. | 49 | +2 | 0.5% |
| Health Care Service Corporation | 20 | −2 | 0.2% |
| Consolidated Assoc of Railroad Employees HC | 13 | 0 | 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, 3,945 beneficiaries in Navajo County were assigned to 65 Medicare Shared Savings Program ACOs, 34.9% 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.