Medicare Advantage in Honolulu County, Hawaii
114,496 people in Honolulu County, Hawaii were enrolled in Medicare Advantage in October 2026, 54.6% of 209,830 eligible beneficiaries (−0.6 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 32% of reported enrollment; 13 parent organizations have 11 or more members and the HHI is 2,309 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 14,369 members here are in plans that terminate or leave the county, and Centene Corporation leaves. MA plans offered go from 20 to 22.
Parent organizations in Honolulu County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 36,762 | −868 | 32.2% |
| Hawaii Medical Service Association | 29,566 | +2,908 | 25.9% |
| Kaiser Foundation Health Plan, Inc. | 24,068 | +309 | 21.1% |
| Devoted Health, Inc. | 10,500 | +5,008 | 9.2% |
| Humana Inc. | 9,572 | −5,259 | 8.4% |
| AlohaCare | 1,323 | +141 | 1.2% |
| Centene Corporation | 1,096 | −1,538 | 1.0% |
| CVS Health Corporation | 1,052 | −21 | 0.9% |
| Elevance Health, Inc. | 143 | +3 | 0.1% |
| California Physicians' Service | 41 | +3 | under 0.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 40 | +2 | under 0.1% |
| Health Care Service Corporation | 17 | 0 | under 0.1% |
| Highmark Health | 16 | 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, 11,833 beneficiaries in Honolulu County were assigned to 156 Medicare Shared Savings Program ACOs, 22.3% of assignable Original Medicare beneficiaries. Together, roughly 65% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.