Missouri 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 Missouri 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 Missouri Medigap rules helps you make a confident decision.
All information verified against CMS data and state sources as of April 2026.
In This Missouri Medigap Guide:
Medigap Plans Available in Missouri
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 Missouri 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 Missouri. You pay a higher annual deductible before benefits kick in, but monthly premiums are significantly lower than standard Plan G.
Missouri Medigap Rates: Plan G & Plan N
| Plan | Age 65 | Age 70 | Age 75 |
|---|---|---|---|
| Plan G | $175/mo | Varies | Varies |
| Plan N | $130/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 Missouri Medigap Pricing Works
Missouri uses issue-age-rated Medigap pricing. Your premium is based on your age when you first purchase the policy. Premiums may increase over time due to inflation but not solely because of aging. Buying earlier means a lower starting premium.
Household discount: Many Medigap carriers in Missouri offer 5-12% household or spousal discounts when two people in the same household both have Medigap policies.
Tobacco surcharge: Tobacco users in Missouri typically pay approximately 10 to 15 percent typical surcharge varies by carrier more in Medigap premiums.
Plan G vs Plan N in Missouri
Plan G and Plan N are the two most popular Medigap plans in Missouri. 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 Missouri
Top Medigap carriers in Missouri:
- UnitedHealthcare (AARP)
- Mutual of Omaha
- Anthem
- Cigna
- Humana
Cigna and UnitedHealthcare (AARP) compete for lowest Plan G rates depending on ZIP code typically offers among the lowest Plan G premiums in Missouri. 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: Missouri Medigap carriers have historically had below average — Missouri averaged approximately 7 percent increases in 2025-2026 versus roughly 10 percent nationally rate increases compared to the national average.
Missouri Medigap Switching Rights
Missouri birthday rule: Missouri has a unique Anniversary Rule — during a 60-day window (30 days before and 30 days after your Medigap policy’s annual anniversary date), you can switch to a different carrier’s plan of equal or lesser coverage with no medical underwriting. This is tied to your policy anniversary date, not your birthday. Missouri is the only state using this model. You cannot use this rule to upgrade to a higher-coverage plan letter. This annual switching window allows you to change Medigap plans without medical underwriting, potentially finding lower premiums.
Guaranteed Issue Rights in Missouri
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
Missouri-specific guaranteed issue protections: Annual Anniversary Rule switching window for equal or lesser plans, all standard federal guaranteed issue rights including Medigap OEP at age 65, loss of employer group coverage, Medicare Advantage trial right within first 12 months, insurer bankruptcy or involuntary loss of coverage
Additional Missouri Medigap rules: Missouri prohibits attained-age Medigap pricing making it one of only four states with this protection. Missouri unique Anniversary Rule provides annual guaranteed-issue switching window tied to policy anniversary date. Over 32 Medigap insurers operate in the state providing strong competition. Missouri SHIP program at missouriship.org offers free Medicare counseling. Missouri DOI maintains a Medigap Rate Shopper Tool updated bimonthly at insurance.mo.gov for comparing all carrier rates by ZIP code age and tobacco status.
Common Medigap Mistakes in Missouri
- 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 Missouri Medigap Rates
Ready to compare Medigap plans in Missouri? Use the official Medicare Plan Finder or contact your local SHIP counselor.
Official Sources & Resources
- Medicare.gov: medicare.gov
- Missouri Department of Commerce and Insurance: https://dci.mo.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.