Medicare Advantage in St. Charles County, MO, for 2027.
CMS lists 81 Medicare Advantage plans here for 2027, 2 more than 2026 (79). 53,178 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
5 plans with members in the county end or leave it, plus 34 with 10 or fewer members here. CMS moves 838 members to another plan, and 42,522 stay in the same plan.
| Plan | Insurer | Members | Why |
|---|---|---|---|
| AARP Medicare Advantage from UHC ST-2 (PPO) | UnitedHealth | 1,364 | Plan terminated |
| HealthSpring True Choice Savings (PPO) | Health Care Service | 41 | Plan terminated |
| UHC Medicare Advantage AM-0002 (Regional PPO) | UnitedHealth | 29 | Plan terminated |
| UHC Complete Care Support AM-1A (Regional PPO C-SNP) | UnitedHealth | 22 | Plan terminated |
| UHC Complete Care AM-1 (Regional PPO C-SNP) | UnitedHealth | 11 | Plan terminated |
Where CMS moves members
| 2026 plan | 2027 plan | Members |
|---|---|---|
| UHC Dual Complete MO-S3 (HMO-POS D-SNP) | UHC Dual Complete MO-S3 (HMO-POS D-SNP) | 695 |
| UHC Dual Complete MO-V001 (HMO-POS D-SNP) | UHC Dual Advantage MO-V1 (HMO-POS D-SNP) | 112 |
| Wellcare Giveback (HMO-POS) | Wellcare Simple (HMO-POS) | 31 |
Who holds the members
- UnitedHealth23,283
- CVS Health11,393
- Humana8,240
- Lumeris Group Holdings6,538
- Elevance Health1,865
- Blue Cross Blue Shield of Michigan Mutual Ins. Co.899
Individual Medicare Advantage members by parent company, October 2026.
Top rated plans sold here
- UHC Nursing Home Plan MO-F001 (PPO I-SNP)UnitedHealth5.0
- Humana Essentials Plus Giveback (HMO)Humana4.5
- Humana Essentials Plus Giveback (HMO)Humana4.5
- Humana Full Access (PPO)Humana4.5
- Humana Gold Plus - Diabetes and Heart (HMO C-SNP)Humana4.5
- Humana Gold Plus SNP-DE H0028-015 (HMO-POS D-SNP)Humana4.5
- Humana Gold Plus SNP-DE H4461-044 (HMO-POS D-SNP)Humana4.5
- Humana Total Complete (HMO)Humana4.5
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 81 plans, open each plan's benefits and star measures, and see what each insurer paid agents in 2026.
Open St. Charles 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 Missouri 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.