MA Enrollment Explorer / Parent organizations / Imperial Health Plan of California
Imperial Health Plan of California: Medicare Advantage enrollment and market share
Imperial Health Plan of California had 53,667 Medicare Advantage members in October 2026, #52 nationally with 0.15% of all MA enrollment. It gained 28,804 members (+115.9%) since October 2025, and has enrollment in 3 states and 56 counties with 11 or more members, leading the market in 4 of them. In the 2026 Annual Election Period (December to February) it gained 21,855 members (+81.4%). For 2027, 0 of its members are in plans that terminate and 66 in plans leaving their county, and it leaves 4 counties entirely. Among members who stay, 0 lose a Part B giveback and 428 an OTC allowance.
54KMA members, October 2026
+115.9%change since October 2025 (+28,804)
0.15%national MA share, rank 52
1contracts with enrollment
Largest states
| State | Members | Share of state MA |
|---|---|---|
| California | 53,361 | 1.4% |
| Nevada | 14 | 0.0% |
| Arizona | 13 | 0.0% |
Largest counties
| County | Members | Change since October 2025 | Share of county MA |
|---|---|---|---|
| Sonoma County, CA | 4,954 | +4,837 | 7.5% |
| Merced County, CA | 4,644 | +1,178 | 38.4% |
| Stanislaus County, CA | 4,585 | +2,344 | 8.0% |
| Kern County, CA | 4,551 | +2,570 | 7.0% |
| San Joaquin County, CA | 3,162 | +867 | 4.4% |
| Imperial County, CA | 2,963 | −313 | 20.9% |
| Contra Costa County, CA | 2,497 | +1,942 | 2.1% |
| Riverside County, CA | 2,424 | +1,897 | 0.8% |
| Santa Clara County, CA | 1,743 | +632 | 1.1% |
| El Dorado County, CA | 1,480 | +1,389 | 6.7% |
| Ventura County, CA | 1,448 | +1,245 | 2.0% |
| Napa County, CA | 1,277 | +1,218 | 8.6% |
| Butte County, CA | 1,274 | +896 | 23.6% |
| Sacramento County, CA | 1,129 | +149 | 0.6% |
| Los Angeles County, CA | 1,043 | +601 | 0.1% |
Contracts
| Contract | Plan type | Oct 2024 | Oct 2025 | Oct 2026 |
|---|---|---|---|---|
| H5496 Imperial Health Plan of California, Inc. | HMO/HMOPOS | 9,434 | 24,863 | 53,667 |
Star ratings for these contracts are in the MA Quality Dashboard.