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    Medicare Advantage · Washington · enrollment Oct 2026

    Medicare Advantage in Washington: 667,271 members, 14 carriers, UnitedHealth in front.

    UnitedHealth holds 48.0% of Washington’s visible Medicare Advantage members, ahead of Humana at 19.4% and Kaiser at 13.8%. The market grew +2.4% (+15,568 members) from Nov 2025 to Oct 2026 and stepped −0.3% at the 2026 election period. 49.6% of the state's Medicare beneficiaries are in a Medicare Advantage plan.

    Visible members
    667,271
    Oct 2026
    Carriers
    14
    122 plans with members
    MA penetration
    49.6%
    of 1,593,638 eligible
    Twelve months
    +2.4%
    +15,568 members
    Election step
    −0.3%
    December to January 2026
    Top three
    81.2%
    HHI 2,943, highly concentrated

    Every carrier with members in Washington

    Ranked by visible members in Oct 2026. The twelve-month change runs Nov 2025 to Oct 2026; the election step is the carrier’s own December-to-January change. Counties led counts counties where the carrier has the most visible members and at least one other carrier is visible. UnitedHealth leads 17 of the 38 counties with a lead. At the election period Devoted stepped up most (+108.4%) and Community Health Plan of Washington stepped down most (−35.0%).

    #CarrierMembersShareTwelve monthsElection stepCounties ledRating$0 premiumPlans
    1UnitedHealth320,394
    48.0%
    		+1.7%+1.4%17 of 333.7297%31
    2Humana129,506
    19.4%
    		+26.2%+15.9%7 of 334.1896%25
    3Kaiser92,168
    13.8%
    		−0.6%−6.8%1 of 154.5032%20
    4Aetna (CVS)37,987
    5.7%
    		−22.4%−20.9%0 of 73.8693%7
    5Centene32,971
    4.9%
    		−2.0%−3.2%12 of 362.5092%11
    6Cambia16,831
    2.5%
    		−16.5%−11.6%0 of 63.783%7
    7Molina12,977
    1.9%
    		−6.7%−3.9%0 of 363.00100%2
    8Community Health Plan of Washington8,792
    1.3%
    		−37.0%−35.0%0 of 273.50100%2
    9Devoted5,032
    0.8%
    		+159.4%+108.4%1 of 8–100%4
    10Providence4,075
    0.6%
    		−10.9%−16.4%0 of 6––5
    11SCAN Group3,466
    0.5%
    		––0 of 3–0%2
    12Elevance2,229
    0.3%
    		+8.7%−2.4%0 of 24––2
    13Health Care Service Corporation681
    0.1%
    		−22.9%−47.8%0 of 33.98100%3
    14Marquis Companies I, Inc.162
    0.0%
    		––0 of 1–100%1

    Washington county by county

    39 counties with visible members, largest first. A county’s leader is the carrier with the most visible members there; a county with one visible carrier shows no leader, because the others are suppressed, not absent. Penetration is Medicare Advantage members as a share of the county’s Medicare beneficiaries.

    CountyVisible membersCarriersLeaderLeader shareMA penetrationDual eligibles
    King166,2849UnitedHealth47.8%53.7%57,928
    Snohomish80,28110UnitedHealth56.7%59.6%21,918
    Pierce79,69512UnitedHealth58.9%51.9%27,562
    Clark64,77011Humana29.9%67.7%13,946
    Spokane63,36911UnitedHealth63.1%57.7%21,194
    Thurston27,17210UnitedHealth49.9%52.7%9,289
    Whatcom21,5276UnitedHealth40.1%46.5%7,235
    Kitsap20,9429UnitedHealth34.7%40.1%7,020
    Yakima19,5196UnitedHealth57.5%46.4%10,955
    Cowlitz17,8749UnitedHealth39.6%66.8%5,056
    Skagit13,2259UnitedHealth54.8%45.0%4,151
    Lewis11,6937UnitedHealth80.6%56.4%3,855
    Benton11,1707UnitedHealth50.4%32.5%5,761
    Island9,0826UnitedHealth67.6%41.5%1,996
    Mason7,0016UnitedHealth51.4%44.6%2,547
    Chelan6,9166Centene60.9%39.8%2,864
    Grant6,0036Humana44.0%36.6%3,513
    Clallam5,1265UnitedHealth87.1%23.3%3,337
    Stevens4,5244Humana79.1%34.2%2,343
    Franklin4,1316UnitedHealth54.1%37.2%2,450
    Walla Walla4,1276Humana42.7%33.0%2,147
    Grays Harbor4,0775Centene66.2%23.7%4,186
    Douglas3,1405Centene60.7%40.5%1,183
    Okanogan3,0836Centene44.4%28.9%2,299
    Kittitas1,7673Humana73.8%26.8%1,247
    Jefferson1,5937UnitedHealth39.9%17.1%1,382
    Asotin1,5743Centene71.6%26.1%1,204
    Pacific1,3185Centene39.4%19.2%1,468
    Whitman1,1105Centene54.6%28.0%998
    Pend Oreille1,0665Centene43.1%28.4%798
    Adams8234Centene47.6%34.8%583
    San Juan6884Centene52.5%16.7%480
    Wahkiakum5865Kaiser52.6%45.5%228
    Ferry5394Centene68.8%26.8%489
    Skamania4475Devoted40.3%23.5%398
    Lincoln4323Humana59.0%17.6%537
    Klickitat4024Humana67.7%10.2%976
    Columbia1743Centene43.1%22.7%222
    Garfield211one visible carrier–13.5%93

    Washington's twelve months

    Visible Medicare Advantage members in Washington each month, Nov 2025 to Oct 2026. The December-to-January step is the election period; the rest of the year moves on new eligibles, special enrollment and deaths.

    Nov 2025 · 651,703Oct 2026 · 667,271

    What 2027 does to Washington

    The fate assigned to every plan for 2027, joined to the members in it today. A plan that ends sends its members to choose again; a plan dropping counties keeps the plan but not every county, and which counties is not stated.

    Plans that end
    143,260

    members in Washington are in plans that end for 2027.

    • UnitedHealth66,042
    • Centene29,577
    • Humana20,226
    • Kaiser9,385
    • Aetna (CVS)5,973
    • Cambia4,546
    • Providence4,075
    • Elevance2,047
    Plans dropping counties
    194,876

    members are in plans that keep selling in Washington but drop at least one county for 2027.

    • UnitedHealth · 8 plans144,253
    • Aetna (CVS) · 3 plans26,982
    • Humana · 4 plans13,960
    • Cambia · 4 plans7,149
    • Kaiser · 1 plans2,092
    • Centene · 2 plans258
    • Elevance · 1 plans182

    The plans on sale in Washington for 2027

    Benefit design weighted by each plan’s members today, so a figure is what the market’s members are offered, not a count of plans. The rating is the 2027 overall Star Rating, weighted the same way.

    $0 premium
    83%

    of members are in a plan with no monthly premium

    In-network maximum
    $7,150

    median out-of-pocket maximum, member weighted

    Star Rating
    3.85

    2027 overall, member weighted

    • UnitedHealth3.72 stars · 97% at $0 · $7,150 max
    • Humana4.18 stars · 96% at $0 · $6,050 max
    • Kaiser4.50 stars · 32% at $0 · $4,950 max
    • Aetna (CVS)3.86 stars · 93% at $0 · $8,900 max
    • Centene2.50 stars · 92% at $0 · $9,850 max
    • Cambia3.78 stars · 3% at $0 · $6,900 max
    Carrier Command · for Medicare Advantage plans

    The read on every carrier in Washington is in Carrier Command.

    A monthly position page for each of the 14 carriers here: risk and rebate against the market, Stars levers, the election-period forecast, county standing and the written read. Launching for Medicare Advantage plans.

    Request early access See Carrier Command

    Other states

    Every state has its own page; the largest carriers have one nationally.

    UnitedHealth in every state · Humana in every state · Kaiser in every state · All states and carriers

    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.
    • Plan fates are the ones assigned for contract year 2027; benefit design is the 2027 filing; the rating is the 2027 overall Star Rating of each carrier's contracts, weighted by members in Washington.
    • A carrier is a parent organization; its brands in Washington may carry other names. The rank 1st to 14th counts every parent with visible members in 2026.
    • 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.