Medicare Advantage plans changing or leaving Montana counties for 2027
12 Medicare Advantage plans are leaving Montana for 2027 and 9 are changing, each plan counted once. Across the state's 50 counties that is 202 county-level plan listings ending and 150 changing. Pick your county for its numbers.
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Medicare Advantage plans in your area are changing or leaving for 2027.
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Medicare Advantage plans in your area are changing or leaving for 2027.
Is your plan one of them? Call now — one free call tells you.
Available now — current wait: 0 min
A real person answers. About 5 minutes, no obligation.
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Montana counties, most changes first
| County | Leaving | Changing | Total |
|---|---|---|---|
| Yellowstone County | 12 | 6 | 18 |
| Flathead County | 10 | 7 | 17 |
| Cascade County | 6 | 7 | 13 |
| Glacier County | 10 | 3 | 13 |
| Golden Valley County | 10 | 3 | 13 |
| Lake County | 9 | 3 | 12 |
| Chouteau County | 7 | 3 | 10 |
| Judith Basin County | 6 | 4 | 10 |
| Pondera County | 6 | 4 | 10 |
| Ravalli County | 6 | 4 | 10 |
| Rosebud County | 6 | 4 | 10 |
| Teton County | 6 | 4 | 10 |
| Big Horn County | 6 | 3 | 9 |
| Fergus County | 6 | 3 | 9 |
| Liberty County | 6 | 3 | 9 |
| Meagher County | 6 | 3 | 9 |
| Mineral County | 6 | 3 | 9 |
| Musselshell County | 6 | 3 | 9 |
| Sanders County | 6 | 3 | 9 |
| Sweet Grass County | 6 | 3 | 9 |
| Toole County | 6 | 3 | 9 |
| Wheatland County | 6 | 3 | 9 |
| Gallatin County | 2 | 6 | 8 |
| Lewis and Clark County | 2 | 6 | 8 |
| Missoula County | 2 | 6 | 8 |
| Carbon County | 2 | 4 | 6 |
| Custer County | 6 | 0 | 6 |
| Hill County | 6 | 0 | 6 |
| Lincoln County | 2 | 4 | 6 |
| Park County | 3 | 3 | 6 |
| Silver Bow County | 2 | 4 | 6 |
| Beaverhead County | 2 | 3 | 5 |
| Broadwater County | 2 | 3 | 5 |
| Deer Lodge County | 2 | 3 | 5 |
| Granite County | 2 | 3 | 5 |
| Jefferson County | 2 | 3 | 5 |
| Madison County | 2 | 3 | 5 |
| Powell County | 2 | 3 | 5 |
| Stillwater County | 3 | 2 | 5 |
| McCone County | 4 | 0 | 4 |
| Treasure County | 0 | 3 | 3 |
| Daniels County | 0 | 1 | 1 |
| Fallon County | 0 | 1 | 1 |
| Garfield County | 0 | 1 | 1 |
| Petroleum County | 0 | 1 | 1 |
| Phillips County | 0 | 1 | 1 |
| Powder River County | 0 | 1 | 1 |
| Prairie County | 0 | 1 | 1 |
| Roosevelt County | 0 | 1 | 1 |
| Valley County | 0 | 1 | 1 |
Also for Montana: plans rated 4 stars or higher in the 2027 CMS Star Ratings, by Montana county · every state’s 2027 changes · Montana Medicare Advantage by city.
What to do before December 7
If you are in a Medicare Advantage plan today, your plan must send you an Annual Notice of Change by September 30 that spells out exactly what is different for 2027. Read it before the Annual Enrollment Period (Open Enrollment), which runs October 15 through December 7.
If your plan is leaving your county, you will get a separate notice and a Special Enrollment Period to choose new coverage. If you do nothing, you may be returned to Original Medicare without drug coverage, so it is worth acting during the window.
A licensed agent can check your doctors and prescriptions against the plans that will actually operate in your county next year. For unbiased help, contact Medicare.gov or 1-800-MEDICARE.
Watch
The Medicare Advantage changes for 2027 in Montana, in 28 seconds
Transcript. Good evening. Across the country Medicare Advantage Plans are changing or all together leaving some states in 2027. That's right, in Montana, 12 plans are leaving and 9 are changing. But there is some good news as 3 new plans are entering the market with a fresh set of benefits to choose from. The bottom line: take a few minutes to compare Medicare Advantage plans in your area and see if your plan is affected.
Recorded live session
Medicare Annual/Open Enrollment, live: questions on the 2027 changes in Montana
Medicare Annual/Open Enrollment 2027 live, day 7, evening: Medicare Advantage changes by state. Recorded live Oct. 21, 2026, 6:59 p.m. ET; the recording plays here. Program-level information only; no plan is recommended.
Good to know
Frequently asked questions
Why do the numbers differ so much from county to county?
What does “changing” mean for 2027?
Do you list which plans are leaving?
- CMS — MA/Part D Landscape & Plan Finder data
For personalized answers, contact Medicare.gov or 1-800-MEDICARE.