Updated July 2, 2026
Montana is a lower-density Medigap market. Fewer carriers compete here than in larger states, which limits your options when shopping for the same plan letter. Standard federal rules apply, and Plan G averages around $145 per month, but the number of quotes you can collect will be smaller than in a state like Michigan or Missouri.
FAQs
How much does Medigap Plan G cost in Montana?
Plan G premiums in Montana run around $145 a month for most new enrollees, though your exact rate depends on your age, sex, tobacco use and the insurer you choose.
What happens if I apply for Medigap in Montana after my enrollment window closes?
Outside the 6 month Open Enrollment period, insurers in Montana can ask health questions and use medical underwriting, which can mean a higher premium or a denied application.
Fewer carriers, same benefits
Federal standardization means that a Plan G sold in Montana covers exactly the same benefits as a Plan G anywhere else in the country. What changes with fewer competing carriers is the price spread. In a thin market, you may find only two or three carriers quoting a given plan letter, and their rates may cluster more tightly than you would see in a higher-density state. That makes it even more important to get every available quote rather than accepting the first one. The Medigap cost calculator gives you a starting estimate by age, and the plan comparison page covers the differences between plan letters if you are considering Plan N or others alongside Plan G.
Things to Know Before You Enroll in Montana
Your Medigap Open Enrollment Period is 6 months, starting when you turn 65 and Part B goes active. Carriers cannot decline you or charge more based on your health during this window. Once it closes, underwriting is allowed in Montana. The open enrollment calculator will show your dates precisely. If Medicare Advantage is also under consideration, the Medigap vs Advantage calculator can help you model the cost difference over time.