CMS's own filing for Washington
Medicare Advantage plans in Washington, by the numbers
What CMS published about Medicare enrollment in Washington: 5 of 5 measures filed for this state, each one a field of the state's own row with the date the file was read.
- figures published by CMS
- 5
- counts CMS withheld
- 0
- the day this file was read
- 2026-09-11
Where Washington sits among the states
49.2% of everyone with Medicare in Washington is in a Medicare Advantage or other health plan rather than Original Medicare. That puts Washington 30th of 51, between New Mexico above it and Arkansas below. Across the country the same figure runs from 62.8% in Michigan down to 3.0% in Alaska, so what counts as the ordinary choice depends on where a person lives, and this is what it is where they do.
Every measure CMS filed for Washington
| Measure | What CMS published | Source |
|---|---|---|
| People with Medicare | In 2025, 1,558,503 people were enrolled in Medicare in Washington. | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In Medicare Advantage and other health plans | In 2025, 767,100 of them were in Medicare Advantage or another health plan rather than Original Medicare in Washington (49.2% of everyone with Medicare in Washington). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In Original Medicare | In 2025, 791,403 stayed in Original Medicare in Washington (50.8% of everyone with Medicare in Washington). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In a stand-alone Part D drug plan | In 2025, 478,287 bought drug coverage as a stand-alone Part D plan in Washington (30.7% of everyone with Medicare in Washington). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| Also covered by Medicaid | In 2025, 230,412 were covered by Medicaid as well as Medicare in Washington (14.8% of everyone with Medicare in Washington). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
A withheld figure means CMS did not publish the count, never that the count is zero.
Cite or embed this figure
Washington: 5 Medicare enrollment figures published by CMS and 0 counts withheld (Medicare Plan Comparison State Enrollment Index).
Cite as: "Medicare Plan Comparison State Enrollment Index: Washington", updated 2026-09-11, https://medicareplancomparison.com/states/washington/.
Download the Washington figures (CSV), free to reuse with citation.