Medicare plan changes in Washington for 2027
Across 39 counties in Washington, the 2027 CMS file lists 324 county listings of Medicare Advantage plans with drug coverage, compared with 480 in 2026. By our count, 0 counties have none in 2027, including counties that do not appear in the CMS file at all.
Before you choose a plan
Compare plans for your ZIP code, drugs and doctors on the official Medicare Plan Finder, or call 1-800-MEDICARE (1-800-633-4227). Free, unbiased counselling is available from your State Health Insurance Assistance Program at shiphelp.org.
By county
| County | 2026 plans | 2027 plans | Change | Companies leaving |
|---|---|---|---|---|
| Adams County | 5 | 3 | -2 | Centene Corporation |
| Asotin County | 2 | 2 | +0 | Centene Corporation |
| Benton County | 10 | 6 | -4 | Centene Corporation, Providence St Joseph Health |
| Chelan County | 8 | 5 | -3 | Centene Corporation |
| Clallam County | 8 | 1 | -7 | Centene Corporation |
| Clark County | 37 | 25 | -12 | Health Care Service Corporation, Providence St Joseph Health |
| Columbia County | 5 | 3 | -2 | Centene Corporation |
| Cowlitz County | 27 | 16 | -11 | Centene Corporation, Health Care Service Corporation |
| Douglas County | 6 | 4 | -2 | Centene Corporation |
| Ferry County | 5 | 3 | -2 | Centene Corporation |
| Franklin County | 10 | 5 | -5 | Centene Corporation, Providence St Joseph Health |
| Garfield County | 5 | 3 | -2 | Centene Corporation |
| Grant County | 8 | 5 | -3 | Centene Corporation |
| Grays Harbor County | 5 | 3 | -2 | Centene Corporation |
| Island County | 15 | 7 | -8 | Centene Corporation, Kaiser Foundation Health Plan, Inc. |
| Jefferson County | 13 | 9 | -4 | Centene Corporation |
| King County | 30 | 22 | -8 | Centene Corporation |
| Kitsap County | 25 | 20 | -5 | Centene Corporation |
| Kittitas County | 3 | 3 | +0 | None |
| Klickitat County | 2 | 2 | +0 | None |
| Lewis County | 15 | 13 | -2 | Centene Corporation |
| Lincoln County | 3 | 3 | +0 | None |
| Mason County | 14 | 10 | -4 | Centene Corporation |
| Okanogan County | 8 | 5 | -3 | Centene Corporation |
| Pacific County | 4 | 2 | -2 | Centene Corporation |
| Pend Oreille County | 5 | 3 | -2 | Centene Corporation |
| Pierce County | 33 | 27 | -6 | Centene Corporation |
| San Juan County | 4 | 2 | -2 | Centene Corporation |
| Skagit County | 20 | 10 | -10 | CVS Health Corporation, Centene Corporation, Kaiser Foundation Health Plan, Inc. |
| Skamania County | 7 | 8 | +1 | Centene Corporation |
| Snohomish County | 34 | 23 | -11 | Centene Corporation, Providence St Joseph Health |
| Spokane County | 24 | 18 | -6 | Centene Corporation, Providence St Joseph Health |
| Stevens County | 4 | 3 | -1 | Centene Corporation |
| Thurston County | 31 | 24 | -7 | Centene Corporation |
| Wahkiakum County | 10 | 11 | +1 | Centene Corporation |
| Walla Walla County | 10 | 6 | -4 | Centene Corporation, Providence St Joseph Health |
| Whatcom County | 14 | 4 | -10 | Centene Corporation, Kaiser Foundation Health Plan, Inc. |
| Whitman County | 2 | 2 | +0 | Centene Corporation |
| Yakima County | 9 | 3 | -6 | Centene Corporation |
Stand-alone Part D drug plans in Washington for 2027
8 plans in 2027, compared with 10 in 2026. Lowest monthly drug plan premium: $5.30 (2026: $0).
| Plan | Company | Monthly premium | Deductible | Star rating |
|---|---|---|---|---|
| Wellcare Value Script (PDP) | Wellcare | $5.30 | $700 | Not Applicable |
| Humana Basic Rx Plan (PDP) | Humana | $6.30 | $700 | Not Applicable |
| Wellcare Classic (PDP) | Wellcare | $7.30 | $700 | Not Applicable |
| HealthSpring Assurance Rx (PDP) | HealthSpring | $9.30 | $700 | Not Applicable |
| Humana Value Rx Plan (PDP) | Humana | $37.40 | $687 | Not Applicable |
| AARP Medicare Rx Saver from UHC (PDP) | UnitedHealthcare | $105.50 | $700 | Not Applicable |
| Humana Premier Rx Plan (PDP) | Humana | $127.90 | $350 | Not Applicable |
| AARP Medicare Rx Preferred from UHC (PDP) | UnitedHealthcare | $184.20 | $300 | Not Applicable |
Sources
- Centers for Medicare & Medicaid Services, CY2027 Medicare Advantage and Part D Landscape file (data last updated 18 October 2026)
- Centers for Medicare & Medicaid Services, CY2026 Medicare Advantage and Part D Landscape file (September 2026 release)
- US Census Bureau, 2024 Gazetteer Files, counties
Checked 29 October 2026. Plans and premiums can change before 1 January 2027. Confirm any plan on Medicare.gov before you enrol.