Montana 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 Montana 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 Montana Medigap rules helps you make a confident decision.
All information verified against CMS data and state sources as of April 2026.
In This Montana Medigap Guide:
Medigap Plans Available in Montana
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 Montana 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 Montana. You pay a higher annual deductible before benefits kick in, but monthly premiums are significantly lower than standard Plan G.
Montana Medigap Rates: Plan G & Plan N
| Plan | Age 65 | Age 70 | Age 75 |
|---|---|---|---|
| Plan G | $237/mo | Varies | Varies |
| Plan N | $207/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 Montana Medigap Pricing Works
Montana uses community-rated Medigap pricing, the most consumer-friendly method. Everyone pays the same premium regardless of age. Your rate will not increase simply because you get older, though carriers may still raise premiums due to inflation or rising healthcare costs.
Household discount: Many Medigap carriers in Montana offer 5-12% household or spousal discounts when two people in the same household both have Medigap policies.
Tobacco surcharge: Tobacco users in Montana typically pay approximately 10 more in Medigap premiums.
Plan G vs Plan N in Montana
Plan G and Plan N are the two most popular Medigap plans in Montana. 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 Montana
Top Medigap carriers in Montana:
- Blue Cross Blue Shield of Montana
- Mutual of Omaha
- WMI Mutual
- Nassau
- Mountain Health CO-OP
WMI Mutual typically offers among the lowest Plan G premiums in Montana. 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: Montana Medigap carriers have historically had average rate increases compared to the national average.
Montana Medigap Switching Rights
Montana 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 Montana
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
Montana-specific guaranteed issue protections: Under-65 disabled Medicare beneficiaries must be offered at least one Medigap plan, MCHA transition guaranteed-issue window for former high-risk pool members, standard federal guaranteed issue rights
Additional Montana Medigap rules: Carriers must offer Medigap to under-65 disabled Medicare beneficiaries on guaranteed-issue basis; former MCHA high-risk pool members received guaranteed-issue transition window to Medigap in 2013-2014; approximately 20 carriers offer household discounts up to 14 percent; no birthday rule for annual switching
Common Medigap Mistakes in Montana
- 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 Montana Medigap Rates
Ready to compare Medigap plans in Montana? Use the official Medicare Plan Finder or contact your local SHIP counselor.
Official Sources & Resources
- Medicare.gov: medicare.gov
- Montana Commissioner of Securities and Insurance: https://csimt.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.