2027 open enrollment. 3.15 million people must pick a new Medicare Advantage plan. See every plan and county, free.3.15M must pick a new plan.
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Medicare Advantage plan exits 2027 in King County, WA
26,137 of the 165,946 Medicare Advantage members in King County (15.8%) are in a plan that is not sold in the county for 2027: 20 of the 64 plans sold there in September 2026 end, from the CMS 2027 Landscape and crosswalk. Washington: 23.5%; the nation: 10.6%.
Period: plan year 2027 against September 2026 members · Updated 2026-10-20 · Next: CMS January 2027 enrollment (February 2027): where the members landed
- members, Sept 2026
- 165,946
- members, Sept 2026
- must pick for 2027
- 26,137
- must pick for 2027
- share of members
- 15.8%
- share of members
- plans end
- 20 of 64
- plans end
Medicare Advantage members in King County, 2015 to 2026
MA enrollment in September each year, with MA penetration (members over Medicare eligibles) at the top of each bar, from the CMS state-county penetration file. Navy: the last two years. 59 plans are listed for the county for 2027 against 68 for 2026.
The plans that end for 2027
Every plan sold in King County in September 2026 with members whose plan is not sold there for 2027: how it went (terminated, or its service area reduced so it continues elsewhere), the members the same company offers a new or renumbered plan of the same type, and the members whose company sells nothing in the county next year.
| Plan | Company | Type | Members | Terminated | Service area reduced | Offered a new or renumbered plan | Company gone |
|---|---|---|---|---|---|---|---|
| AARP Medicare Advantage From UHC Wa-12 (PPO) H2001-087 | UnitedHealth Group, Inc. | Regular PPO | 4,638 | 4,638 | 0 | 4,638 | 0 |
| AARP Medicare Advantage From UHC Wa-0010 (HMO-POS) H3805-037 | UnitedHealth Group, Inc. | Regular HMO | 2,730 | 2,730 | 0 | 0 | 0 |
| Humanachoice H7617-019 (PPO) H7617-019 | Humana Inc. | Regular PPO | 2,533 | 2,533 | 0 | 0 | 0 |
| AARP Medicare Advantage From UHC Wa-0002 (PPO) H1278-029 | UnitedHealth Group, Inc. | Regular PPO | 2,318 | 2,318 | 0 | 2,318 | 0 |
| Aetna Medicare Signature Advantage (HMO) H3931-126 | CVS Health Corporation | Regular HMO | 2,261 | 2,261 | 0 | 2,261 | 0 |
| Regence Medadvantage + Rx Primary (PPO) H5009-011 | Cambia Health Solutions, Inc. | Regular PPO | 1,945 | 1,945 | 0 | 0 | 0 |
| UHC Complete Care Wa-13 (HMO-POS C-SNP) H3805-043 | UnitedHealth Group, Inc. | CSNP HMO | 1,773 | 1,773 | 0 | 1,773 | 0 |
| AARP Medicare Advantage From UHC Wa-16 (PPO) H2001-136 | UnitedHealth Group, Inc. | Regular PPO | 1,749 | 1,749 | 0 | 1,749 | 0 |
| AARP Medicare Advantage From UHC Wa-0004 (PPO) H1278-032 | UnitedHealth Group, Inc. | Regular PPO | 1,414 | 1,414 | 0 | 1,414 | 0 |
| Humana Gold Plus Snp-de H5619-167 (HMO D-SNP) H5619-167 | Humana Inc. | D-SNP HMO | 1,246 | 0 | 1,246 | 0 | 0 |
| Humanachoice H5216-426 (PPO) H5216-426 | Humana Inc. | Regular PPO | 892 | 892 | 0 | 0 | 0 |
| AARP Medicare Advantage Patriot No Rx Wa-ma01 (PPO) H1278-031 | UnitedHealth Group, Inc. | Regular PPO | 817 | 817 | 0 | 817 | 0 |
| Wellcare Simple (HMO-POS) H0029-011 | Centene Corporation | Regular HMO | 725 | 725 | 0 | 0 | 0 |
| Wellcare Giveback (HMO-POS) H0029-009 | Centene Corporation | Regular HMO | 568 | 568 | 0 | 0 | 0 |
| Molina Medicare Complete Care Select (HMO D-SNP) H5823-010 | Molina Healthcare, Inc. | D-SNP HMO | 195 | 195 | 0 | 195 | 0 |
| AARP Medicare Advantage Access From UHC Wa-11 (PPO) H2001-138 | UnitedHealth Group, Inc. | Regular PPO | 175 | 175 | 0 | 175 | 0 |
| Wellcare Dual Reserve (HMO-POS D-SNP) H0029-010 | Centene Corporation | D-SNP HMO | 53 | 53 | 0 | 0 | 0 |
| Wellcare Dual Liberty Sync Open (PPO D-SNP) H5965-004 | Centene Corporation | D-SNP PPO | 50 | 50 | 0 | 0 | 0 |
| Humana Gold Plus Snp-de H1036-324 (HMO D-SNP) H1036-324 | Humana Inc. | D-SNP HMO | 31 | 31 | 0 | 0 | 0 |
| Wellcare Patriot Giveback Open (PPO) H5965-003 | Centene Corporation | Regular PPO | 24 | 24 | 0 | 0 | 0 |
| 20 plans | 26,137 | 24,891 | 1,246 | 15,340 | 0 |
Download this table (CSV, CC BY 4.0) · cells under 11 members are suppressed by CMS and count as zero, so every count is a floor.
By company in King County
| Company | Members, Sept 2026 | Plans | Plans ending | Must pick | Share of own members | Offered a new or renumbered plan | Company gone |
|---|---|---|---|---|---|---|---|
| UnitedHealth Group, Inc. | 79,338 | 22 | 8 | 15,614 | 19.7% | 12,884 | 0 |
| Humana Inc. | 34,882 | 18 | 4 | 4,702 | 13.5% | 0 | 0 |
| CVS Health Corporation | 17,853 | 5 | 1 | 2,261 | 12.7% | 2,261 | 0 |
| Cambia Health Solutions, Inc. | 4,380 | 2 | 1 | 1,945 | 44.4% | 0 | 0 |
| Centene Corporation | 1,752 | 7 | 5 | 1,420 | 81.1% | 0 | 0 |
| Molina Healthcare, Inc. | 2,803 | 2 | 1 | 195 | 7.0% | 195 | 0 |
| Kaiser Foundation Health Plan, Inc. | 22,877 | 4 | 0 | 0 | 0.0% | 0 | 0 |
| Community Health Plan of Washington | 1,719 | 2 | 0 | 0 | 0.0% | 0 | 0 |
| Elevance Health, Inc. | 342 | 2 | 0 | 0 | 0.0% | 0 | 0 |
King County against Washington and the nation
| Measure | County | Washington | United States |
|---|---|---|---|
| Must pick for 2027, share of members | 15.8% | 23.5% | 10.6% |
| Must pick for 2026 | 13.3% | 10.1% | |
| Must pick for 2025, members | 19,952 of 160,222 | ||
| Must pick for 2026, members | 21,670 of 163,533 | ||
| Must pick for 2027, members | 26,137 of 165,946 |
State and national figures: the Washington hub and the national report.
Star Ratings 2027 in King County
| Measure | 2027 | 2026 | Change |
|---|---|---|---|
| Members in contracts rated 4+ stars | 65.2% | 44.9% | +20.3 pts |
| Member-weighted average star | 4.02 | 3.76 | +0.26 |
| Rated contracts with members here | 26 | 25 |
Members by star, 2027: 5.0: 830 · 4.5: 85,399 · 4.0: 41,871 · 3.5: 59,127 · 3.0: 7,366 · 2.5: 1,744; 416 in unrated contracts. Each contract's 2027 overall star (CMS, released 2026-10-08) weighted by its 2026-09 members in the county, individual and group; 2026 by 2025-09 members.
Sources
- CMS Medicare Advantage/Part D Landscape, plan year 2027: landscape_cy2027-landscape-202609-1.zip (CMS, September 2026); CMS plan crosswalk CY2027.
- CMS monthly enrollment by contract, plan and county, 2026-09 (and the two Septembers before, for the series).
- CMS MA state-county penetration file, September of each year (eligibles, enrollment, penetration).
- CMS Star Ratings 2027, released 2026-10-08. Page object written 2026-10-20.
Receipts: athena(table=medicare_semantic.exits_cells_county_2027_v1, block=plans) 042eb472aa7d…; athena(table=medicare_semantic.exits_cells_county_2025_v1, medicare_semantic.exits_cells_county_2026_v1, medicare_semantic.exits_cells_county_2027_v1, block=series) ee9fd56a8632…; athena(table=medicare_semantic.ma_spine_county_market_v20261012b, block=market) e6c1b5ce62c0…; athena(table=medicare_semantic.ma_spine_contract_stars_v20261012b, weights=medicare_semantic.ma_spine_enroll_plan_county_v20261012a, block=stars) c39711c388e0…. Suppressed cells count as zero in every count.
Cite: Vlada Health (2026). Medicare Advantage plan exits 2027 in King County, WA. https://www.vladahealth.com/medicare-advantage/wa/king. Data: CC BY 4.0.
Method
- Population: members of individual Medicare Advantage plans (H and R contracts, plans 001 to 799, special needs plans included; employer group, Cost, MMP and PACE excluded) in the county in September 2026.
- Must pick: the CMS crosswalk names no successor plan sold in the county for 2027; members CMS moves to a successor in the county are not counted.
- Terminated: the plan is gone from every county. Service area reduced: the plan continues elsewhere but not here. Offered a new or renumbered plan: the same company sells, in this county, the same name under a new number or a new plan of the same HMO or PPO and special needs type. Company gone: no plan of any type from that company in the county.
- Stars: each contract's overall star weighted by its September members in the county; unrated contracts counted apart, never as zero stars. Penetration: the CMS file's own eligibles and MA enrollment.
- Suppression: CMS hides cells under 11 members; they count as zero, so every count is a floor and every share is not.
The full method and the national tables: How we counted, and how to check it.
Questions
- How many Medicare Advantage members in King County must pick a new plan for 2027?
- 26,137 of 165,946 members (15.8%): their plan is not sold in the county for 2027 according to the CMS crosswalk and Landscape. Washington as a whole: 23.5%; the nation: 10.6%.
- Which plan in King County ends with the most members?
- AARP Medicare Advantage From UHC Wa-12 (PPO) (H2001-087, UnitedHealth Group, Inc.): 4,638 members in September 2026, terminated; the company offers them a new or renumbered plan of the same type in the county.
- Which company ended the most plans in King County for 2027?
- UnitedHealth Group, Inc.: 15,614 of its 79,338 members in the county (19.7%), 8 of its 22 plans.
- What share of King County's Medicare eligibles are in Medicare Advantage?
- 53.8% in September 2026: 198,464 of 369,217 eligibles, from the CMS state-county penetration file.
- How are King County's members rated for 2027?
- 65.2% of members are in contracts rated 4 stars or more for 2027 (44.9% the year before); the member-weighted average star is 4.02 over 26 rated contracts.
- How does 2027 compare with 2026 in King County?
- 21,670 members (13.3%) had to pick a new plan for 2026; for 2027 it is 26,137 (15.8%), a change of +4,467 members.
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