Medicare in Washington
May 20, 2026
Washington Medicare quick facts (2026)
- Beneficiaries: Roughly 1.4 million Washingtonians are enrolled in Medicare.
- Active Advantage carriers: Kaiser Permanente Washington, Premera Blue Cross, Regence BlueShield, Humana, UnitedHealthcare, Aetna, Community Health Plan of Washington, and others.
- State Medicaid program: Apple Health (Washington Medicaid) — relevant for dual-eligible coordination through D-SNPs.
- State quirk: Washington has additional state-level Medigap consumer protections beyond the federal floor — confirm current rules with the Washington Office of the Insurance Commissioner.
Common Washington Medicare questions
Q: Can I switch Medigap plans in Washington without underwriting?
A: Washington offers state-level protections beyond the federal minimums. Many residents can move to a Medigap plan of equal or lesser benefit annually without medical underwriting. Verify the current rule and your specific situation with the Washington Office of the Insurance Commissioner or the carrier.
Q: When can I enroll in Medicare in Washington?
A: Federal calendar — Initial Enrollment Period around your 65th birthday; Annual Enrollment Period October 15 – December 7, 2026.
Q: Is Kaiser Permanente Washington different from Kaiser in other states?
A: Yes — Kaiser Permanente Washington (formerly Group Health) operates a Washington-specific network. Provider availability and plan structure differ from Kaiser regions in California, Oregon, Colorado, etc.
Q: What's Apple Health?
A: Apple Health is Washington's Medicaid program. Dual-eligibles may qualify for D-SNPs.
Run the numbers for your situation: enrollment calculator · IRMAA calculator · Part D cost calculator.
Medicare in Washington — plans and how to compare.
What Washington residents should know about Medicare Advantage, Medicare Supplement, and Part D — and how plan availability differs in Washington.
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Medicare basics in Washington
Medicare is a federal program, so the core rules are the same in Washington as everywhere else — but the specific plans available, premiums, and carrier networks vary by ZIP code and county.
Most Washington residents become eligible at 65 through Social Security. See eligibility for full rules.
For the 7-month enrollment window timeline, see Turning 65.
What Washington residents typically compare
- Medicare Advantage — Many Washington counties have 20-50+ Advantage plans. Plans, premiums, and extras vary by county.
- Medicare Supplement (Medigap) — Plans are federally standardized but premium pricing and underwriting rules vary by state.
- Part D prescription drug plans — Available statewide but formularies and preferred pharmacies differ by plan.
See Advantage vs. Supplement for the side-by-side framework.
Washington timing rules
The federal Medigap Open Enrollment window is the same everywhere — 6 months starting the month you turn 65 AND have Part B. During that window, no medical underwriting.
Outside that window, most states (including Washington unless otherwise noted) allow Medigap carriers to use medical underwriting. Check Washington's State Health Insurance Assistance Program (SHIP) for current state-specific rules.
How to compare plans in Washington
- Confirm your ZIP — plans differ within Washington by county
- List your prescriptions and check each on the plan's formulary
- Confirm your doctors are in-network
- Compare premium + deductible + maximum out-of-pocket
- Check star ratings for plans you are weighing
- Ask about prior authorization requirements (common on Advantage)