Kaiser in Washington: 92,168 Medicare Advantage members, 13.8% share, 3rd of 14.
Kaiser Foundation Health Plan, Inc., shown as Kaiser, lost 587 members (−0.6%) from Nov 2025 to Oct 2026 and stepped −6.8% at the 2026 election period against the market's −0.3%. It sells in 15 of Washington’s 39 counties with visible members and leads 1; Humana sits just ahead at 19.4%, Aetna (CVS) just behind at 5.7%.
Kaiser's twelve months in Washington
Visible members each month, Nov 2025 to Oct 2026. The December-to-January step is the election period. The market line for the state is on the Washington page.
Where Kaiser's Washington members are
The carrier’s five largest counties by visible members, with its share of each county’s visible Medicare Advantage members. It sells in 15 counties and leads 1 of them.
| County | Kaiser members | Share of county | County visible members | County leader |
|---|---|---|---|---|
| King | 23,042 | 13.9% | 166,284 | UnitedHealth |
| Clark | 16,449 | 25.4% | 64,770 | Humana |
| Spokane | 7,448 | 11.8% | 63,369 | UnitedHealth |
| Pierce | 7,445 | 9.3% | 79,695 | UnitedHealth |
| Snohomish | 6,946 | 8.6% | 80,281 | UnitedHealth |
Kaiser against the Washington market
The carrier’s figures beside the state’s, each weighted by members. A difference is a difference, not a grade: a higher maximum or a lower rating is a design and a result, read in context.
top three hold 81.2%
market 3.85, +0.65, 1st of 6 rated
market 83%, −52 points
market $7,150, −$2,200
| # | Carrier | Members | Share | Twelve months | Election step | Counties led | Rating | $0 premium |
|---|---|---|---|---|---|---|---|---|
| 1 | UnitedHealth | 320,394 | 48.0% | +1.7% | +1.4% | 17 of 33 | 3.72 | 97% |
| 2 | Humana | 129,506 | 19.4% | +26.2% | +15.9% | 7 of 33 | 4.18 | 96% |
| 3 | Kaiser | 92,168 | 13.8% | −0.6% | −6.8% | 1 of 15 | 4.50 | 32% |
| 4 | Aetna (CVS) | 37,987 | 5.7% | −22.4% | −20.9% | 0 of 7 | 3.86 | 93% |
| 5 | Centene | 32,971 | 4.9% | −2.0% | −3.2% | 12 of 36 | 2.50 | 92% |
| 6 | Cambia | 16,831 | 2.5% | −16.5% | −11.6% | 0 of 6 | 3.78 | 3% |
What 2027 does to Kaiser's plans in Washington
The fate assigned to each of the carrier’s plans for 2027, joined to the members in it today.
9,385 members are in 3 plans that end and must choose again. 2,092 members are in 1 plan that drop at least one county; which counties is not stated. In all, 12% of Kaiser’s Washington members are in a plan whose service area or status changes.
The read on Kaiser in Washington is in Carrier Command.
Risk and rebate against the market, the five-test read on coding versus selection, Stars levers and next year's cut points, the election-period forecast and the county-by-county standing, written as a monthly page.
Kaiser elsewhere, and the rest of Washington
- UnitedHealth48.0%
- Humana19.4%
- Aetna (CVS)5.7%
- Centene4.9%
- Cambia2.5%
How these numbers are made
- Members are visible members: CMS suppresses any plan-county cell of ten or fewer, so small counties undercount. Market share excludes employer group plans.
- Enrollment is Oct 2026; the twelve months run Nov 2025 to Oct 2026; the election step compares December 2025 with January 2026.
- Kaiser is the parent organization Kaiser Foundation Health Plan, Inc.; its 20 plans in Washington may sell under other brand names. The rating is the 2027 overall Star Rating of its contracts weighted by members in Washington; $0 premium and the in-network maximum are the 2027 filings weighted by members today.
- Plan fates are the ones assigned for contract year 2027.
- Every figure comes from public CMS data as Livmor reads it, and the page is rebuilt when a new month posts. Livmor Carrier Command, public CMS data.