Colorado Medigap plans (also called Medicare Supplement plans) cover the gaps in Original Medicare, including deductibles, copays, and coinsurance that would otherwise come out of your pocket. This comprehensive Colorado Medigap guide covers available plans, average premiums, top carriers, the birthday rule, guaranteed issue rights, and how to choose between Plan G, Plan N, and other options. Whether you are approaching your initial Medigap Open Enrollment or considering a plan switch, understanding Colorado Medigap rules helps you make a confident decision.
All information verified against CMS data and state sources as of April 2026.
In This Colorado Medigap Guide:
Medigap Plans Available in Colorado
Standardized plans: A, B, C, D, F, G, K, L, M, N
Every Medigap plan with the same letter provides identical benefits regardless of which carrier sells it. Plan G from one company covers the exact same medical costs as Plan G from another company. The only difference is the premium and the customer service experience. This standardization makes comparison shopping straightforward.
Plan F: Still available in Colorado for beneficiaries who became eligible for Medicare before January 1, 2020. Plan F covers all gaps including the Part B deductible. New enrollees after 2020 cannot purchase Plan F.
High-Deductible Plan G: Available in Colorado. You pay a higher annual deductible before benefits kick in, but monthly premiums are significantly lower than standard Plan G.
Colorado Medigap Rates: Plan G & Plan N
| Plan | Age 65 | Age 70 | Age 75 |
|---|---|---|---|
| Plan G | $155/mo | $190/mo | $235/mo |
| Plan N | $110/mo | Varies | Varies |
These are approximate averages. Your actual premium depends on your carrier, zip code, age, gender, and tobacco use. Always compare quotes from at least three carriers before choosing.
How Colorado Medigap Pricing Works
Colorado uses attained-age-rated Medigap pricing. Your premium increases as you age. This means your Medigap costs will rise over time, making it especially important to compare rates annually and switch carriers during open enrollment windows if available.
Household discount: Many Medigap carriers in Colorado offer 5-12% household or spousal discounts when two people in the same household both have Medigap policies.
Tobacco surcharge: Tobacco users in Colorado typically pay approximately Colorado limits or prohibits tobacco surcharges on Medigap policies more in Medigap premiums.
Plan G vs Plan N in Colorado
Plan G and Plan N are the two most popular Medigap plans in Colorado. Here is how they compare:
| Feature | Plan G | Plan N |
|---|---|---|
| Part B Deductible | Not covered (you pay $240/year in 2026) | Not covered |
| Part B Copay | Covered (no copays) | Up to $20 copay for office visits, up to $50 for ER visits not resulting in admission |
| Part B Excess Charges | Covered | Not covered |
| Monthly Premium | Higher | Lower (typically 15-25% less than Plan G) |
| Best For | Predictable costs, no copays | Lower premiums, okay with small copays |
Bottom line: If you want the most comprehensive coverage with no copays at the doctor, choose Plan G. If you prefer lower monthly premiums and do not mind occasional $20 copays, Plan N offers strong coverage at a lower cost.
Top Medigap Carriers in Colorado
Top Medigap carriers in Colorado:
- AARP/UnitedHealthcare
- Cigna
- Anthem Blue Cross Blue Shield
- Transamerica
- Mutual of Omaha
Cigna typically offers among the lowest Plan G premiums in Colorado. However, the cheapest carrier varies by zip code and age bracket.
When comparing Medigap carriers, the benefits are identical for the same plan letter. Focus on premium cost, AM Best financial strength rating (A or higher is strong), customer service reputation, and rate increase history.
Rate increase trend: Colorado Medigap carriers have historically had average rate increases compared to the national average.
Colorado Medigap Switching Rights
Colorado does not have a Medigap birthday rule. Your primary opportunity to buy or switch Medigap plans without medical underwriting is during your initial 6-month Medigap OEP.
Guaranteed Issue Rights in Colorado
Federal law provides guaranteed issue rights in specific situations where you can buy a Medigap plan without medical underwriting:
- Losing employer/union coverage
- Your Medicare Advantage plan leaves your area
- You joined an MA plan when first eligible and want to switch back within 12 months (trial right)
- Your Medigap carrier goes bankrupt
Colorado-specific guaranteed issue protections: Federal guaranteed issue rights apply, mandatory Medigap sales to under-65 disabled Medicare beneficiaries, 6-month guaranteed issue window after losing Health First Colorado (Medicaid) coverage
Additional Colorado Medigap rules: Colorado requires all Medigap insurers to sell policies to Medicare beneficiaries under age 65 with disabilities at guaranteed issue during their open enrollment period. Colorado limits or prohibits tobacco surcharges on Medigap premiums. Colorado provides a 6-month guaranteed issue window for beneficiaries who lose Health First Colorado (Medicaid) coverage. Most carriers use attained-age rating though the state does not mandate a specific pricing method. The Colorado SHIP program (1-888-696-7213) provides free Medicare counseling through 17 local partner agencies statewide.
Common Medigap Mistakes in Colorado
- Missing your OEP: Your 6-month Medigap Open Enrollment Period is your best window. After it closes, carriers can deny you or charge higher premiums based on health.
- Choosing by carrier name alone: Medigap plans are standardized. A well-known brand’s Plan G costs more but covers the exact same benefits as a smaller carrier’s Plan G.
- Ignoring rate increase history: Some carriers offer low introductory rates then raise premiums aggressively. Ask for 5-year rate increase history before buying.
- Not comparing at least 3 carriers: Premium differences of 30-50% between carriers for the same plan letter are common.
- Confusing Medigap with Medicare Advantage: They are different products. You cannot have both simultaneously (except during limited trial rights).
Compare Colorado Medigap Rates
Ready to compare Medigap plans in Colorado? Use the official Medicare Plan Finder or contact your local SHIP counselor.
Official Sources & Resources
- Medicare.gov: medicare.gov
- Colorado Division of Insurance (DORA): https://doi.colorado.gov/
- NAIC Medigap Shopping Guide: naic.org
- CMS Medicare & You Handbook: Medicare & You (PDF)
Last verified April 2026. Contact us if you notice outdated information.