Key Takeaways

  • Washington requires a 6-month open enrollment period for Medicare Supplement starting at age 65
  • Guaranteed issue rights apply when losing other coverage or during open enrollment
  • Washington prohibits pre-existing condition waiting periods during open enrollment
  • Medicare Supplement plans must be standardized (Plans A through N)
  • Washington has additional guaranteed issue rights beyond federal minimums
Last updated: January 2026

Washington Medicare Supplement (Medigap) Regulations

Washington has adopted protections for Medicare beneficiaries purchasing Medicare Supplement (Medigap) insurance, including open enrollment and guaranteed issue rights.

Open Enrollment Period

Washington provides a 6-month open enrollment period for Medicare Supplement:

When It Begins

The 6-month period starts:

  • First day of the month you are 65 or older AND
  • Enrolled in Medicare Part B

Protections During Open Enrollment

  • Guaranteed issue - Must be accepted regardless of health
  • No pre-existing condition exclusions
  • Standard rates - Cannot be charged more for health conditions
  • Any plan available - Can choose any Medigap plan A through N

Key Points

ItemRequirement
Duration6 months
TriggerAge 65 + Part B enrollment
Health UnderwritingProhibited during OE
Plan ChoiceAny available plan

Exam Tip: The 6-month open enrollment period is a federal requirement that Washington enforces. It begins when you turn 65 AND enroll in Medicare Part B.

Guaranteed Issue Rights

Beyond open enrollment, Washington provides guaranteed issue rights in specific situations:

Triggering Events

EventGuaranteed Issue Right
Losing employer coverageCan purchase Medigap within 63 days
Leaving Medicare AdvantageCan return to Medigap within 63 days
Medicare Advantage plan leaves areaCan purchase Medigap
Medigap insurer becomes insolventCan switch to comparable plan
Losing MedicaidCan purchase Medigap

Trial Right

If you leave Medigap for Medicare Advantage:

  • Have 12 months to decide
  • Can return to previous Medigap plan
  • Or any plan from same insurer
  • Guaranteed issue, no health questions

Standardized Plans

Washington requires Medigap plans to be standardized:

Available Plans

PlanBenefits
Plan ABasic benefits only
Plan BBasic + Part A deductible
Plan CComprehensive (pre-2020 only)
Plan DSimilar to C, no Part B excess
Plan FMost comprehensive (pre-2020 only)
Plan GLike F without Part B deductible
Plan K50% cost sharing, out-of-pocket max
Plan L75% cost sharing, out-of-pocket max
Plan M50% Part A deductible
Plan NCost sharing, copays for visits

Note: Plans C and F are only available to those eligible for Medicare before January 1, 2020.

Rate Regulation

Washington has specific Medigap rate rules:

  • Attained age rating permitted (premiums increase with age)
  • Issue age rating also permitted
  • Community rating not required but some insurers offer it
  • Rate increases must be filed with OIC

Washington-Specific Protections

Washington provides additional protections:

  • Extended guaranteed issue in certain situations
  • Consumer assistance through SHIBA (Statewide Health Insurance Benefits Advisors)
  • Rate review by OIC
  • Complaint investigation
Test Your Knowledge

How long is the open enrollment period for Medicare Supplement in Washington?

A
B
C
D
Test Your Knowledge

Which Medicare Supplement plans are NOT available to those who became Medicare-eligible after January 1, 2020?

A
B
C
D