Medicare Advantage in Boulder County, CO, for 2027.
CMS lists 60 Medicare Advantage plans here for 2027, 9 fewer than 2026 (69). 30,611 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
12 plans with members in the county end or leave it, plus 61 with 10 or fewer members here. CMS moves 646 members to another plan, and 21,884 stay in the same plan.
| Plan | Insurer | Members | Why |
|---|---|---|---|
| Aetna Medicare Signature (PPO) | CVS Health | 662 | Plan leaves this county |
| Select Health Medicare Essential (HMO) | Intermountain Health Care | 287 | Plan leaves this county |
| Kaiser Permanente Senior Advantage Choice DM (PPO) | Kaiser Foundation Health Plan | 140 | Plan terminated |
| Aetna Medicare Signature (HMO-POS) | CVS Health | 92 | Plan terminated |
| Select Health Medicare + Kroger (HMO) | Intermountain Health Care | 83 | Plan terminated |
| Kaiser Permanente Senior Advantage Core North (HMO) | Kaiser Foundation Health Plan | 73 | Plan leaves this county |
| Select Health Medicare Flex (HMO) | Intermountain Health Care | 73 | Plan terminated |
| Humana Full Access H5216-333 (PPO) | Humana | 54 | Plan terminated |
| Aetna Medicare Dual Care (HMO D-SNP) | CVS Health | 43 | Plan terminated |
| HealthSpring Preferred (HMO) | Health Care Service | 41 | Plan terminated |
Where CMS moves members
| 2026 plan | 2027 plan | Members |
|---|---|---|
| UHC Dual Complete CO-S4 (HMO-POS D-SNP) | UHC Dual Complete CO-S4 (HMO-POS D-SNP) | 586 |
| HumanaChoice H5216-437 (PPO) | Humana USAA Honor Giveback (PPO) | 40 |
| Humana Value Plus H5216-195 (PPO) | HumanaChoice H5216-223 (PPO) | 20 |
| HumanaChoice SNP-DE H5216-468 (PPO D-SNP) | HumanaChoice SNP-DE H5216-267 (PPO D-SNP) | 10 or fewer |
Who holds the members
- UnitedHealth15,019
- Kaiser Foundation Health Plan8,565
- Humana3,572
- CVS Health1,541
- Devoted Health1,034
- Intermountain Health Care457
Individual Medicare Advantage members by parent company, October 2026.
Top rated plans sold here
- UHC Nursing Home Plan CO-F001 (PPO I-SNP)UnitedHealth5.0
- Humana Dual Select H0028-078 (HMO D-SNP)Humana4.5
- Humana Essentials Plus Giveback (HMO)Humana4.5
- Humana Essentials Plus Giveback (PPO)Humana4.5
- Humana Total Complete (HMO)Humana4.5
- Humana Value Choice (PPO)Humana4.5
- HumanaChoice SNP-DE H7617-067 (PPO D-SNP)Humana4.5
- UHC Dual Advantage CO-V1 (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 60 plans, open each plan's benefits and star measures, and see what each insurer paid agents in 2026.
Open Boulder 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 Colorado 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.