Medicare Advantage in King County, WA, for 2027.
CMS lists 59 Medicare Advantage plans here for 2027, 9 fewer than 2026 (68). 196,954 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
27 plans with members in the county end or leave it, plus 230 with 10 or fewer members here. CMS moves 4,229 members to another plan, and 135,840 stay in the same plan.
| Plan | Insurer | Members | Why |
|---|---|---|---|
| AARP Medicare Advantage from UHC WA-12 (PPO) | UnitedHealth | 4,641 | Plan terminated |
| AARP Medicare Advantage from UHC WA-0010 (HMO-POS) | UnitedHealth | 2,713 | Plan terminated |
| HumanaChoice H7617-019 (PPO) | Humana | 2,535 | Plan terminated |
| AARP Medicare Advantage from UHC WA-0002 (PPO) | UnitedHealth | 2,309 | Plan terminated |
| Aetna Medicare Signature Advantage (HMO) | CVS Health | 2,259 | Plan terminated |
| Regence MedAdvantage + Rx Primary (PPO) | Cambia Health Solutions | 1,948 | Plan terminated |
| UHC Complete Care WA-13 (HMO-POS C-SNP) | UnitedHealth | 1,785 | Plan terminated |
| AARP Medicare Advantage from UHC WA-16 (PPO) | UnitedHealth | 1,746 | Plan terminated |
| AARP Medicare Advantage from UHC WA-0004 (PPO) | UnitedHealth | 1,408 | Plan terminated |
| Humana Gold Plus SNP-DE H5619-167 (HMO D-SNP) | Humana | 1,215 | Plan leaves this county |
Where CMS moves members
| 2026 plan | 2027 plan | Members |
|---|---|---|
| UHC Dual Complete WA-S6 (HMO-POS D-SNP) | UHC Dual Complete WA-S4 (HMO-POS D-SNP) | 3,073 |
| UHC Dual Complete WA-S5 (PPO D-SNP) | UHC Dual Complete WA-S2 (PPO D-SNP) | 513 |
| Wellpoint Full Dual Advantage (HMO D-SNP) | Wellpoint Full Dual Advantage (HMO D-SNP) | 311 |
| Humana Gold Plus H5619-059 (HMO) | Humana Gold Plus H5619-061 (HMO) | 302 |
| Wellpoint Dual Advantage (HMO D-SNP) | Wellpoint Dual Advantage (HMO D-SNP) | 30 |
Who holds the members
- UnitedHealth87,226
- Humana38,250
- Kaiser Foundation Health Plan31,239
- CVS Health28,323
- Cambia Health Solutions4,740
- Molina Healthcare2,787
Individual Medicare Advantage members by parent company, October 2026.
Top rated plans sold here
- UHC Care Advantage WA-E001 (PPO I-SNP)UnitedHealth5.0
- UHC Nursing Home Plan WA-F001 (PPO I-SNP)UnitedHealth5.0
- AARP Medicare Advantage Patriot No RX WA-MA3 (PPO)UnitedHealth4.5
- AARP Medicare Advantage from UHC WA-18 (PPO)UnitedHealth4.5
- Humana Gold Plus - Diabetes and Heart (HMO C-SNP)Humana4.5
- Humana Gold Plus H1036-321 (HMO)Humana4.5
- Humana Gold Plus SNP-DE H1036-325 (HMO D-SNP)Humana4.5
- Humana USAA Honor Giveback (PPO)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 59 plans, open each plan's benefits and star measures, and see what each insurer paid agents in 2026.
Open King 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.