Washington State offers strong protections and flexible options for Medicare Supplement plans in 2026. These plans, also called Medigap, help cover costs that Original Medicare does not pay, such as deductibles, copayments, and coinsurance.
More than 1.5 million people in Washington are enrolled in Medicare, and many choose Medigap for predictable healthcare costs and nationwide provider access.
Unlike Medicare Advantage, Medigap plans work alongside Original Medicare. They do not include prescription drug coverage, so most people also enroll in a separate Part D plan.
What Medicare Supplement Plans Are Available in Washington for 2026?
Washington offers 10 standardized Medigap plans, labeled A through N. Each plan provides the same benefits regardless of the insurance company.
Calculate Your 2026 COLA Increase →This means a Plan G from one insurer has identical medical coverage as Plan G from another. The only real difference is the monthly premium and customer service.
Common plans in Washington include:
- Plan G, known for broad coverage
- Plan N, which has lower premiums but some copays
- Plan A, a basic option with fewer benefits
Plan F is no longer available to new Medicare enrollees but remains an option for those who became eligible before 2020.
How Much Do Medigap Plans Cost in Washington State?
Medigap premiums in Washington vary based on plan type and location. According to the Washington Office of the Insurance Commissioner, estimated monthly premiums can range from about $44 to $392 depending on the plan and provider.
Some basic plans may start lower, while more comprehensive plans like Plan G typically cost more.
Washington uses a “community rating” system. This means:
- Premiums are based on where you live
- Your age and health do not affect your price once enrolled
This rule protects consumers from rising costs due to health conditions and makes pricing more predictable over time.
What Makes Washington Medigap Plans Unique?
Washington has some of the most flexible Medigap rules in the country. One major benefit is the ability to switch plans.
If you are already enrolled in a Medigap plan:
- You can switch to another plan of equal or lesser benefits at any time
- You do not need medical underwriting in many cases
This flexibility allows you to adjust your coverage as your healthcare needs change.
For example, you could move from a higher-cost plan to a lower-cost option without worrying about denial due to health conditions.
What Do Washington Medigap Plans Cover?
All Medigap plans help pay for costs that Original Medicare does not fully cover.
Typical coverage includes:
- Medicare Part A coinsurance and hospital costs
- Medicare Part B coinsurance
- Blood transfusions
- Skilled nursing facility care (depending on plan)
More comprehensive plans like Plan G also cover excess charges and most out-of-pocket costs.
However, Medigap does not cover:
- Prescription drugs
- Dental, vision, or hearing care
- Long-term care
To cover prescriptions, you must enroll in a Medicare Part D plan.
When Should You Enroll in a Medigap Plan?
The best time to enroll is during your Medigap Open Enrollment Period. This is a six-month window that begins when you are 65 or older and enrolled in Medicare Part B.
During this period:
- You cannot be denied coverage
- You pay standard rates
- No health questions are required
If you apply outside this window, insurers may require medical underwriting and could charge higher premiums or deny coverage.
How Do You Compare Medigap Plans in Washington?
Since benefits are standardized, comparing plans is mainly about cost and service.
Focus on:
- Monthly premiums
- Rate increase history
- Company reputation
- Customer support
You can review official plan information and approved premiums through the Washington Office of the Insurance Commissioner website.
Also consider how often premiums increase over time. Even if a plan starts cheap, it may become more expensive later.
What Is the Difference Between Medigap and Medicare Advantage?
Medigap and Medicare Advantage serve different purposes.
Medigap:
- Works with Original Medicare
- Offers more provider freedom
- Has higher monthly premiums but lower out-of-pocket costs
Medicare Advantage:
- Replaces Original Medicare
- Often has lower premiums
- Uses provider networks and may have higher out-of-pocket costs
You cannot have both at the same time.
