MA Enrollment Explorer / Parent organizations / Orange County Health Authority
Orange County Health Authority: Medicare Advantage enrollment and market share
Orange County Health Authority had 19,449 Medicare Advantage members in October 2026, #86 nationally with 0.05% of all MA enrollment. It gained 1,047 members (+5.7%) since October 2025, and has enrollment in 1 state and 2 counties with 11 or more members. In the 2026 Annual Election Period (December to February) it gained 106 members (+0.6%). For 2027, 0 of its members are in plans that terminate and 12 in plans leaving their county, and it leaves 1 county entirely.
19KMA members, October 2026
+5.7%change since October 2025 (+1,047)
0.05%national MA share, rank 86
2contracts with enrollment
Largest states
| State | Members | Share of state MA |
|---|---|---|
| California | 19,417 | 0.5% |
Largest counties
| County | Members | Change since October 2025 | Share of county MA |
|---|---|---|---|
| Orange County, CA | 19,405 | +1,053 | 5.7% |
| Los Angeles County, CA | 12 | new | 0.0% |
| Riverside County, CA | 0 | −14 | 0.0% |
Contracts
| Contract | Plan type | Oct 2024 | Oct 2025 | Oct 2026 |
|---|---|---|---|---|
| H5433 CalOptima Health OneCare | HMO/HMOPOS | 17,289 | 18,160 | 19,154 |
| H7501 CalOptima Health PACE | National PACE | 231 | 242 | 295 |
Star ratings for these contracts are in the MA Quality Dashboard.