Medicare Advantage in Yellowstone County, MT, for 2027.
CMS lists 16 Medicare Advantage plans here for 2027, 10 fewer than 2026 (26). 14,504 people in the county had an individual Medicare Advantage plan in October 2026.
Sources: CMS CY2027 plan file (October 2026 release), CMS CY2026 plan file (September 2026 release), CMS enrollment by county (CPSC), October 2026, CMS 2027 Plan Crosswalk (October 1, 2026), CMS 2027 Star Ratings Data Tables (October 8, 2026). Member counts are floors because CMS hides counts of 10 or fewer.
The county in numbers
Plans that end here for 2027
11 plans with members in the county end or leave it, plus 32 with 10 or fewer members here. CMS moves 0 members to another plan, and 9,600 stay in the same plan.
| Plan | Insurer | Members | Why |
|---|---|---|---|
| PacificSource Medicare MyCare Choice Rx 29 (HMO-POS) | PacificSource | 1,072 | Plan terminated |
| AARP Medicare Advantage from UHC MT-0002 (PPO) | UnitedHealth | 873 | Plan terminated |
| Blue Cross Medicare Advantage Choice Plus (PPO) | Health Care Service | 471 | Plan terminated |
| AARP Medicare Advantage from UHC MT-0001 (PPO) | UnitedHealth | 442 | Plan terminated |
| Blue Cross Medicare Advantage Classic (PPO) | Health Care Service | 380 | Plan terminated |
| Blue Cross Medicare Advantage Dental Premier (PPO) | Health Care Service | 220 | Plan terminated |
| Blue Cross Medicare Advantage Health Choice (PPO) | Health Care Service | 130 | Plan terminated |
| Blue Cross Medicare Advantage Optimum (PPO) | Health Care Service | 124 | Plan terminated |
| AARP Medicare Advantage Patriot No Rx MT-MA01 (PPO) | UnitedHealth | 89 | Plan terminated |
| AARP Medicare Advantage Access from UHC MT-3 (PPO) | UnitedHealth | 71 | Plan terminated |
Who holds the members
- Humana9,241
- UnitedHealth2,400
- Health Care Service1,365
- PacificSource1,099
- CVS Health361
- Elevance Health27
Individual Medicare Advantage members by parent company, October 2026.
Top rated plans sold here
- Humana Dual QMB Only (PPO D-SNP)Humana4.5
- Humana Essentials Plus Giveback (PPO)Humana4.5
- Humana Full Access (PPO)Humana4.5
- Humana Value Choice (PPO)Humana4.5
- HumanaChoice SNP-DE H7617-036 (PPO D-SNP)Humana4.5
- UHC Dual Complete MT-S001 (PPO D-SNP)UnitedHealth4.5
2027 overall Star Rating, 4.5 or more. Each plan's measure stars are in the county lookup.
See every plan, premium and copay in the free lookup.
Sort all 16 plans, open each plan's benefits and star measures, and see what each insurer paid agents in 2026.
Open Yellowstone in the lookupWorking this county for AEP?
The AEP 2027 County Kit puts this county and your others in one file: the plans that end, where members land, what is still sold and a crosswalk sheet, with every number tied to its CMS file.
See the AEP 2027 County KitAll Montana county pages. Facts from public CMS files, prepared by Health and Tech Now. Not plan advice. Check a plan's Summary of Benefits before you enroll.