Key Takeaways

  • Colorado 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
  • Colorado prohibits pre-existing condition waiting periods during open enrollment
  • Medicare Supplement plans must be standardized (Plans A through N)
  • Colorado requires clear disclosure of coverage limitations and exclusions
Last updated: January 2026

Colorado Medicare Supplement (Medigap) Regulations

Colorado follows federal Medicare Supplement guidelines while providing additional consumer protections for beneficiaries purchasing Medigap insurance.

Open Enrollment Period

Colorado 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

Exam Tip: The 6-month open enrollment period is critical. During this time, applicants have guaranteed access to any Medigap plan without health underwriting.

Guaranteed Issue Rights

Beyond open enrollment, Colorado 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 (Medicare Advantage)

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

Colorado requires Medigap plans to be standardized per federal requirements:

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

Colorado allows multiple rating methods:

Rating Methods Permitted

MethodDescription
Attained AgePremiums increase with age
Issue AgePremium based on age at purchase
Community RatingSame rate regardless of age

Rate Filing Requirements

  • All rate changes must be filed with DOI
  • DOI reviews for reasonableness
  • Insurers must justify rate increases
  • Rate information publicly available

Disclosure Requirements

Colorado requires clear disclosures:

  • Outline of coverage provided
  • Premium costs and rating method
  • Exclusions and limitations
  • Pre-existing condition rules
  • Cancellation and renewal terms
Test Your Knowledge

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

A
B
C
D
Test Your Knowledge

Which Medicare Supplement plans are no longer available to people newly eligible for Medicare after January 1, 2020?

A
B
C
D