Medicare Advantage in Mason County, WA, for 2027.
CMS lists 37 Medicare Advantage plans here for 2027, 7 fewer than 2026 (44). 8,867 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
13 plans with members in the county end or leave it, plus 38 with 10 or fewer members here. CMS moves 44 members to another plan, and 3,677 stay in the same plan.
| Plan | Insurer | Members | Why |
|---|---|---|---|
| AARP Medicare Advantage Extras from UHC WA-14 (HMO-POS) | UnitedHealth | 1,675 | Plan leaves this county |
| AARP Medicare Advantage Essentials from UHC WA-6 (HMO-POS) | UnitedHealth | 384 | Plan leaves this county |
| AARP Medicare Advantage from UHC WA-12 (PPO) | UnitedHealth | 345 | Plan terminated |
| Wellcare Simple (HMO-POS) | Centene | 247 | Plan terminated |
| UHC Complete Care WA-13 (HMO-POS C-SNP) | UnitedHealth | 183 | Plan terminated |
| AARP Medicare Advantage from UHC WA-16 (PPO) | UnitedHealth | 144 | Plan terminated |
| Wellcare Giveback (HMO-POS) | Centene | 127 | Plan terminated |
| Humana Gold Plus SNP-DE H1036-326 (HMO D-SNP) | Humana | 78 | Plan terminated |
| AARP Medicare Advantage from UHC WA-0005 (HMO-POS) | UnitedHealth | 39 | Plan leaves this county |
| AARP Medicare Advantage from UHC WA-0010 (HMO-POS) | UnitedHealth | 20 | Plan terminated |
Where CMS moves members
| 2026 plan | 2027 plan | Members |
|---|---|---|
| Wellpoint Full Dual Advantage (HMO D-SNP) | Wellpoint Full Dual Advantage (HMO D-SNP) | 44 |
| Wellpoint Dual Advantage (HMO D-SNP) | Wellpoint Dual Advantage (HMO D-SNP) | 10 or fewer |
Who holds the members
- UnitedHealth4,129
- Kaiser Foundation Health Plan2,847
- Humana987
- Centene429
- CVS Health234
- Molina Healthcare129
Individual Medicare Advantage members by parent company, October 2026.
Top rated plans sold here
- UHC Nursing Home Plan WA-F001 (PPO I-SNP)UnitedHealth5.0
- AARP Medicare Advantage from UHC WA-18 (PPO)UnitedHealth4.5
- Humana USAA Honor Giveback (PPO)Humana4.5
- HumanaChoice H7617-016 (PPO)Humana4.5
- Kaiser Permanente Medicare Advantage Basic (HMO)Kaiser Foundation Health Plan4.5
- Kaiser Permanente Medicare Advantage Essential (HMO)Kaiser Foundation Health Plan4.5
- Kaiser Permanente Medicare Advantage Optimal (HMO)Kaiser Foundation Health Plan4.5
- Kaiser Permanente Medicare Advantage Vital Sound (HMO)Kaiser Foundation Health Plan4.5
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 37 plans, open each plan's benefits and star measures, and see what each insurer paid agents in 2026.
Open Mason 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 Washington 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.