Medicare Supplement Plans Washington: 2026 Rates & Comparison
2026 Medicare Supplement Overview in Washington
Washington State’s Medicare Supplement (Medigap) landscape for 2026 is evolving with substantial premium changes, enhanced prescription drug protections, and county-specific considerations. Medigap plans help pay out-of-pocket costs left over from Original Medicare, and nearly 250,000 Washingtonians rely on them for robust coverage and flexibility. For those seeking details on tax and Medicare funding, our breakdown of 2025 Medicare tax rates offers useful context on systemic changes propelling these cost shifts.
In 2026, Medigap plan premiums across Washington are set to rise markedly. According to new filings with the Washington Office of the Insurance Commissioner, most plans will see increases of 8-12%. This results from expanding healthcare utilization, higher provider costs, and inflation. For example, Premera-a leading insurer-received approval for new rates effective April 1, 2026, demonstrating the state’s proactive regulation and transparency.
What is Medigap & Who Should Consider It?
Medigap-also known as Medicare Supplement-plans are standardized, private insurance policies that work alongside Original Medicare (Parts A and B). They help cover deductibles, copayments, coinsurance, and other gaps not paid by Medicare. In Washington, an attractive feature is the state’s unique approach to medical underwriting-residents can often change plans without health questions due to Washington’s continuous open enrollment policy, a benefit not available nationwide.
- Best for: People desiring flexibility to use any doctor/hospital that accepts Medicare.
- Avoids: Network restrictions common in Medicare Advantage plans.
- Popular due to: Consistent, predictable cost-sharing and fewer administrative hassles.
Key 2026 Changes Affecting Medigap
With 2026 introducing several impactful updates, understanding these changes is critical for anyone making Medicare decisions in Washington.
Medigap Premium Increases
The Office of the Insurance Commissioner approved an overall 8-12% Medigap rate hike for 2026. For context, Premera Blue Cross-the state’s top Medigap provider-issued the following 2026 monthly premiums (before applicable discounts):
| Plan | Non-Spousal | Spousal Discount |
|---|---|---|
| Plan A | $245 | $221 |
| Plan C* | $333 | $300 |
| Plan G | $291 | $262 |
| High Deductible Plan G | $76 | $68 |
| Plan N | $220 | $198 |
Across all insurers, Medigap premiums in Washington range from $48 to $514 per month, with a monthly average for 65-year-olds of $237. Plan K offers the most affordable coverage at $112 monthly, while Plan F remains the priciest at $340 on average. If you’re interested in the specific implications and definitions behind Medigap, see our educational guide on Medicare Blue plans and benefits.
Note: Members can save an additional $5 per month through Automatic Funds Transfer (AFT) enrollment.
*Plan C is only available to those who became Medicare-eligible before January 1, 2020.
Original Medicare & Part D Cost Updates
- Part B premium: Rising to $202.90/month (up $17.90 from 2025)
- Part B deductible: $283/year (up $26)
- Part A full premium: $565/month (up $47 for those without sufficient work credits)
- Part A reduced premium: $311/month (up $26)
For prescription drugs (Part D), the 2026 out-of-pocket cap is set to $2,100 (down from $2,200). Average Part D plan premiums decrease to $34.50/month, with significant savings for those with high drug costs thanks to the lower cap and ongoing $35 cap for insulin. Furthermore, weight-loss and certain specialty drugs now have negotiated rates; for example, medications like Ozempic and Mounjaro will have a $245 monthly copay, a dramatic drop from previous retail prices of $1,000-$1,350.
For a focused breakdown of Part D costs in other states, see our analysis of 2026 Medicare Part D plans in Florida.
Medicare Advantage (Part C) and Network Adjustments
The Centers for Medicare & Medicaid Services (CMS) finalized a 5.06% payment increase to Medicare Advantage plans for 2026. Nevertheless, this higher funding does not necessarily translate into lower member costs. Many Washington carriers are moving to HMO-only networks, requiring more frequent referrals and eliminating PPO options in some counties. Extra, non-medical benefits-such as meal delivery or transportation-are now restricted to members who meet certain chronic eligibility standards due to the end of the Value-Based Insurance Design (VBID) pilot and transition to tighter SSBCI (Special Supplemental Benefits for the Chronically Ill) rules in 2026.
For a look ahead to Medicare Advantage, we recommend reading our preview of 2025 Medicare Advantage plans.
Summary of 2026 Policy Impacts
- PEBB changes: The Public Employees Benefits Board is implementing updated Medigap rates and potential network changes for 2026.
- WISeR model effects: Washington is evaluating how the WISeR (Washington Insurance Standardized Enrollment & Renewal) model could standardize and simplify Medigap/commercial enrollment options, impacting both enrollment processes and premium calculations.
- Medical underwriting: While Washington traditionally allows generous switching between Medigap plans, insurers may revise health question processes for new enrollees as federal oversight increases.
Best Medigap Plans & Rates in WA (2026)
Top Medicare Supplement Plans in Washington
Plan selection in Washington largely centers around three options, each balancing coverage, cost, and personal medical needs:
- Plan G: The dominant and most comprehensive plan available to new enrollees. It covers all Part A hospital costs, Part B coinsurance, skilled nursing, and foreign travel emergencies, with a 2026 Premera rate of $291 non-spousal ($262 with spousal discount).
- Plan N: A value choice featuring lower premiums ($220 non-spousal), modest copays ($20 per office visit, $50 per ER visit), and full hospital and preventive coverage. Lacks excess charge coverage.
- High Deductible Plan G: At $76/month, this budget-friendly option fits those willing to pay a $2,870 annual deductible before 100% coverage activates.
Additional Considerations: Plan F and Plan C
Plan F (closed to new 65+ enrollees since 2020) remains popular for legacy members, albeit with the highest average monthly premium ($340). Plan C, similar to F but without Part B excess coverage, is likewise restricted to those who qualified before 2020.
Rate Comparison Table (2026 Premera Example)
| Plan | Monthly Rate | Spousal Discount |
|---|---|---|
| Plan G | $291 | $262 |
| Plan N | $220 | $198 |
| High Deductible G | $76 | $68 |
| Plan A | $245 | $221 |
| Plan C (legacy) | $333 | $300 |
Across all providers, average monthly costs by popular plan are:
- Plan G: $259
- Plan F: $340
- Plan N: $200
Spousal and household discounts, Automatic Funds Transfer savings, and occasional “welcome” incentives may lower rates. For official comparisons and nuanced scenarios, refer to our guide on choosing between Medigap and Advantage.
2026 County-Specific & WISeR Model Factors
Exact plan availability and premium rates can differ by county due to local provider agreements, claim experiences, and ZIP code-based risk adjustment. The proposed WISeR model may further streamline choices by standardizing applications and renewals state-wide by 2026 or 2027; watch for pilot announcements from the state.
Part D Drug Coverage in 2026
Major reform for 2026 is the $2,100 annual out-of-pocket cap on drug costs, especially helping those with expensive or complex medication regimens. Washingtonians will benefit from more affordable diabetes and weight management drugs. Insulin is capped at $35/month-reinforcing stable budgeting for chronic care needs. Specialist drugs like Ozempic and Wegovy are now at $245 copays, broadening coverage for prevalent health issues.
Plan Selection Scenarios: Example Profiles
- Jane, Age 67, Skagit County: Needs open doctor choice and has several chronic medications. Comparing Plan G and Plan N, she opts for Plan G’s predictability despite the $291/month rate and supplements with a $34.50 Part D plan to limit medication costs to the new $2,100 cap.
- Raul, Age 71, King County: Rarely travels and doctors are in-network for local Advantage HMOs. He finds a $0-premium Medicare Advantage plan attractive but calculates that out-of-pocket maximums could reach $8,300/year if his health changes drastically. Peace of mind leads him to stick with Medigap Plan N at $220/month (+Part D premium).
- Donna, Spousal Discount, Cowlitz County: Both spouses enroll with Premera Plan G to obtain $29/month total savings, plus $10/mo on AFT.
How to Choose & Enroll
Decision Path: Medigap vs Medicare Advantage
The most pivotal decision for Washington Medicare beneficiaries remains choosing between Original Medicare (plus Medigap and Part D) and Medicare Advantage. Key factors include:
- Provider Flexibility: Medigap allows use of any Medicare-accepting provider nationwide. Advantage restricts you to network doctors and may require referrals or prior authorizations.
- Cost Predictability: Medigap offers fixed monthly rates, separate from prescription costs, with minimal out-of-pocket exposure. Advantage plans offer lower premiums but pass more costs in copays and uncovered services.
- Supplemental Benefits: Non-medical extras (dental, vision, wellness) are now stricter under SSBCI-often unavailable on Medigap; Advantage limits these to specific chronic qualifiers.
To dive deeper into the pros and cons for each approach, see our in-depth comparison of Original Medicare versus Advantage plans.
Enrollment Periods & Timing for 2026
- Annual Open Enrollment: October 15-December 7. Changes to Medigap and Part D coverage take effect January 1, 2026.
- Special Enrollment: Triggered by events such as moving counties, losing employer coverage, or qualifying for Extra Help/Medicare Savings Programs.
- Continuous Medigap Enrollment (Washington): Residents enjoy expanded ability to switch Medigap plans at any time, though new underwriting changes may be on the horizon.
Plan notices-including 2026 premium letters-are sent in February; monitor your insurer portal or mail for updated terms. Always compare your Annual Notice of Change, as formularies and provider directories change yearly.
Financial Help & SHIBA Guidance
Extra Help and Medicare Savings Programs can drastically lower out-of-pocket costs for those with limited income. Washington’s SHIBA program (Statewide Health Insurance Benefits Advisors) offers free, confidential, and unbiased help to determine eligibility and navigate plan selection. Look for online or in-person SHIBA enrollment events each fall.
County Comparison Tool & Next Steps
How County-Specific Rates and Networks Work
Premiums and plan networks vary significantly across Washington’s 39 counties due to localized insurance risk pools, provider contracts, and selective insurer offerings. Using a county-by-county comparison tool is vital, as the best plan for Seattle may differ from Spokane or Yakima. Providers such as Premera, Regence, and UnitedHealthcare post updated 2026 Medigap premium tables by ZIP code and plan type-these resources are accessible on their websites and through the official Medicare.gov Plan Finder.
The WISeR model, once live, will further centralize rate comparison and enrollment, and allow easier switching between plans. Monitor Washington’s Office of the Insurance Commissioner for updates as 2026 approaches.
Using Interactive Rate Tools and Calculators
Whether you value price, coverage, or provider access, leverage free online tools to personalize your Medigap search. Many insurers and advocacy organizations provide interactive calculators-simply enter your age, ZIP code, and desired coverage. Combine these with official resources, like SHIBA’s eligibility checker, to identify savings opportunities. These technological advances, coupled with the 8-12% projected Medigap rate hikes and new Part D prescription caps, make revisiting your coverage annually more important than ever.
For deeper dives into Medicare funding and evolving benefits, check out our guides on Medicare Blue or trends in Medicare tax rates.
