Medicare Advantage in Humboldt County, California
2,686 people in Humboldt County, California were enrolled in Medicare Advantage in October 2026, 8.5% of 31,423 eligible beneficiaries (−2.7 pts since October 2025). Imperial Health Plan of California is the largest parent organization with 33% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 2,189 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 2 to 2.
Parent organizations in Humboldt County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Imperial Health Plan of California | 863 | +762 | 32.9% |
| UnitedHealth Group, Inc. | 665 | +54 | 25.3% |
| Humboldt Senior Resource Center, Inc. | 383 | +31 | 14.6% |
| California Physicians' Service | 353 | +25 | 13.4% |
| Elevance Health, Inc. | 201 | −74 | 7.7% |
| CVS Health Corporation | 96 | −1,600 | 3.7% |
| Kaiser Foundation Health Plan, Inc. | 28 | +2 | 1.1% |
| Humana Inc. | 24 | +3 | 0.9% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 13 | −1 | 0.5% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 13,362 beneficiaries in Humboldt County were assigned to 69 Medicare Shared Savings Program ACOs, 61.9% 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.