Medicare Advantage in Maricopa County, Arizona
423,846 people in Maricopa County, Arizona were enrolled in Medicare Advantage in October 2026, 51.5% of 823,407 eligible beneficiaries (−0.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 38% of reported enrollment; 29 parent organizations have 11 or more members and the HHI is 2,189 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 8,514 members here are in plans that terminate or leave the county, and Kaiser Foundation Health Plan, Inc., Imperial Health Plan of California leave. MA plans offered go from 52 to 52.
Parent organizations in Maricopa County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 162,652 | −25,555 | 38.5% |
| Humana Inc. | 83,815 | +21,190 | 19.8% |
| Health Care Service Corporation | 59,774 | −413 | 14.1% |
| Blue Cross Blue Shield of Arizona | 33,502 | +4,429 | 7.9% |
| CVS Health Corporation | 23,087 | −2,703 | 5.5% |
| Centene Corporation | 9,911 | −967 | 2.3% |
| Mercy Care | 9,431 | −43 | 2.2% |
| Banner Health | 9,165 | +366 | 2.2% |
| Devoted Health, Inc. | 8,502 | +2,702 | 2.0% |
| SCAN Group | 8,037 | +6,036 | 1.9% |
| Alignment Healthcare USA, LLC | 4,772 | +1,814 | 1.1% |
| Gold Kidney Health Plan | 3,288 | +1,817 | 0.8% |
| Elevance Health, Inc. | 2,269 | −20 | 0.5% |
| Eternal Health of Delaware, Inc. | 1,977 | +1,099 | 0.5% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 1,456 | −80 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 118,703 beneficiaries in Maricopa County were assigned to 395 Medicare Shared Savings Program ACOs, 43.4% of assignable Original Medicare beneficiaries. Together, roughly 73% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.