Medicare Advantage in Pima County, Arizona
152,932 people in Pima County, Arizona were enrolled in Medicare Advantage in October 2026, 58.6% of 261,034 eligible beneficiaries (+0.1 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 58% of reported enrollment; 21 parent organizations have 11 or more members and the HHI is 3,687 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 3,545 members here are in plans that terminate or leave the county. MA plans offered go from 50 to 52.
Parent organizations in Pima County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 88,981 | −4,053 | 58.3% |
| Humana Inc. | 20,726 | +4,587 | 13.6% |
| Health Care Service Corporation | 9,574 | +102 | 6.3% |
| CVS Health Corporation | 6,876 | −849 | 4.5% |
| Centene Corporation | 5,088 | −309 | 3.3% |
| Elevance Health, Inc. | 4,266 | −597 | 2.8% |
| Alignment Healthcare USA, LLC | 3,859 | +1,528 | 2.5% |
| Blue Cross Blue Shield of Arizona | 3,123 | +736 | 2.0% |
| Banner Health | 2,997 | −712 | 2.0% |
| SCAN Group | 2,619 | +1,303 | 1.7% |
| Devoted Health, Inc. | 2,218 | +1,075 | 1.5% |
| Mercy Care | 877 | +3 | 0.6% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 541 | −37 | 0.4% |
| Gold Kidney Health Plan | 474 | +329 | 0.3% |
| Eternal Health of Delaware, Inc. | 94 | +45 | 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, 38,962 beneficiaries in Pima County were assigned to 297 Medicare Shared Savings Program ACOs, 52.0% of assignable Original Medicare beneficiaries. Together, roughly 80% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.