MA Enrollment Explorer / Parent organizations / Gemstone Holdings, Inc.
Gemstone Holdings, Inc.: Medicare Advantage enrollment and market share
Gemstone Holdings, Inc. had 36,170 Medicare Advantage members in October 2026, #70 nationally with 0.10% of all MA enrollment. It lost 41,496 members (−53.4%) since October 2025, and has enrollment in 1 state and 24 counties with 11 or more members, leading the market in 4 of them. In the 2026 Annual Election Period (December to February) it lost 41,304 members (−53.5%). For 2027, none of its members are in plans that terminate or leave their county.
36KMA members, October 2026
−53.4%change since October 2025 (−41,496)
0.10%national MA share, rank 70
2contracts with enrollment
Largest states
| State | Members | Share of state MA |
|---|---|---|
| Idaho | 36,130 | 18.9% |
Largest counties
| County | Members | Change since October 2025 | Share of county MA |
|---|---|---|---|
| Ada County, ID | 13,289 | −9,275 | 22.3% |
| Canyon County, ID | 4,902 | −5,630 | 15.7% |
| Kootenai County, ID | 4,748 | −3,195 | 23.6% |
| Twin Falls County, ID | 2,202 | −3,164 | 20.0% |
| Bannock County, ID | 2,094 | −2,403 | 24.9% |
| Bonneville County, ID | 1,718 | −3,723 | 19.7% |
| Gem County, ID | 1,017 | −635 | 28.4% |
| Payette County, ID | 883 | −708 | 24.0% |
| Bingham County, ID | 873 | −1,571 | 22.1% |
| Bonner County, ID | 624 | −849 | 10.1% |
| Cassia County, ID | 542 | −428 | 30.2% |
| Minidoka County, ID | 532 | −552 | 27.8% |
| Boise County, ID | 449 | −360 | 34.2% |
| Jefferson County, ID | 397 | −1,107 | 20.0% |
| Madison County, ID | 325 | −798 | 24.9% |
Contracts
| Contract | Plan type | Oct 2024 | Oct 2025 | Oct 2026 |
|---|---|---|---|---|
| H1350 Blue Cross of Idaho | HMO/HMOPOS | 55,833 | 75,958 | 32,371 |
| H1302 Blue Cross of Idaho | Local PPO | 1,195 | 1,708 | 3,799 |
| H9656 Blue Cross of Idaho | HMO/HMOPOS | 7,911 | n/a | n/a |
Star ratings for these contracts are in the MA Quality Dashboard.