Medicare plan changes in Montana for 2027
Across 56 counties in Montana, the 2027 CMS file lists 178 county listings of Medicare Advantage plans with drug coverage, compared with 339 in 2026. By our count, 9 counties have none in 2027, including counties that do not appear in the CMS file at all.
Before you choose a plan
Compare plans for your ZIP code, drugs and doctors on the official Medicare Plan Finder, or call 1-800-MEDICARE (1-800-633-4227). Free, unbiased counselling is available from your State Health Insurance Assistance Program at shiphelp.org.
By county
| County | 2026 plans | 2027 plans | Change | Companies leaving |
|---|---|---|---|---|
| Beaverhead County | 4 | 2 | -2 | Health Care Service Corporation |
| Big Horn County | 8 | 3 | -5 | Health Care Service Corporation, UnitedHealth Group, Inc. |
| Blaine County (not listed in either CMS file) | 0 | 0 | +0 | None |
| Broadwater County | 5 | 4 | -1 | Health Care Service Corporation |
| Carbon County | 6 | 4 | -2 | Health Care Service Corporation |
| Carter County (not listed in either CMS file) | 0 | 0 | +0 | None |
| Cascade County | 14 | 10 | -4 | Health Care Service Corporation |
| Chouteau County | 10 | 4 | -6 | Health Care Service Corporation |
| Custer County | 5 | 0 | -5 | Health Care Service Corporation |
| Daniels County | 1 | 1 | +0 | None |
| Dawson County (not listed in either CMS file) | 0 | 0 | +0 | None |
| Deer Lodge County | 6 | 4 | -2 | Health Care Service Corporation |
| Fallon County | 1 | 1 | +0 | None |
| Fergus County | 8 | 3 | -5 | Health Care Service Corporation |
| Flathead County | 17 | 10 | -7 | Health Care Service Corporation, UnitedHealth Group, Inc. |
| Gallatin County | 9 | 7 | -2 | Health Care Service Corporation |
| Garfield County | 1 | 1 | +0 | None |
| Glacier County | 11 | 3 | -8 | Health Care Service Corporation, UnitedHealth Group, Inc. |
| Golden Valley County | 11 | 3 | -8 | Health Care Service Corporation, UnitedHealth Group, Inc. |
| Granite County | 5 | 3 | -2 | Health Care Service Corporation |
| Hill County | 5 | 0 | -5 | Health Care Service Corporation |
| Jefferson County | 6 | 5 | -1 | Health Care Service Corporation |
| Judith Basin County | 9 | 4 | -5 | Health Care Service Corporation |
| Lake County | 9 | 2 | -7 | Health Care Service Corporation |
| Lewis and Clark County | 10 | 9 | -1 | Health Care Service Corporation |
| Liberty County | 8 | 3 | -5 | Health Care Service Corporation |
| Lincoln County | 7 | 5 | -2 | Health Care Service Corporation |
| Madison County | 5 | 3 | -2 | Health Care Service Corporation |
| McCone County | 3 | 0 | -3 | UnitedHealth Group, Inc. |
| Meagher County | 8 | 3 | -5 | Health Care Service Corporation |
| Mineral County | 8 | 3 | -5 | Health Care Service Corporation |
| Missoula County | 10 | 8 | -2 | Health Care Service Corporation |
| Musselshell County | 8 | 3 | -5 | Health Care Service Corporation |
| Park County | 6 | 4 | -2 | Health Care Service Corporation |
| Petroleum County | 1 | 1 | +0 | None |
| Phillips County | 1 | 1 | +0 | None |
| Pondera County | 10 | 5 | -5 | Health Care Service Corporation |
| Powder River County | 1 | 1 | +0 | None |
| Powell County | 6 | 4 | -2 | Health Care Service Corporation |
| Prairie County | 1 | 1 | +0 | None |
| Ravalli County | 10 | 5 | -5 | Health Care Service Corporation, UnitedHealth Group, Inc. |
| Richland County (not listed in either CMS file) | 0 | 0 | +0 | None |
| Roosevelt County | 1 | 1 | +0 | None |
| Rosebud County | 9 | 4 | -5 | Health Care Service Corporation |
| Sanders County | 9 | 5 | -4 | Health Care Service Corporation |
| Sheridan County (not listed in either CMS file) | 0 | 0 | +0 | None |
| Silver Bow County | 7 | 5 | -2 | Health Care Service Corporation |
| Stillwater County | 6 | 4 | -2 | Health Care Service Corporation |
| Sweet Grass County | 7 | 2 | -5 | Health Care Service Corporation |
| Teton County | 10 | 6 | -4 | Health Care Service Corporation, UnitedHealth Group, Inc. |
| Toole County | 8 | 3 | -5 | Health Care Service Corporation |
| Treasure County | 3 | 3 | +0 | None |
| Valley County | 1 | 1 | +0 | None |
| Wheatland County | 7 | 2 | -5 | Health Care Service Corporation |
| Wibaux County (not listed in either CMS file) | 0 | 0 | +0 | None |
| Yellowstone County | 17 | 9 | -8 | Health Care Service Corporation, PacificSource, UnitedHealth Group, Inc. |
Stand-alone Part D drug plans in Montana for 2027
9 plans in 2027, compared with 11 in 2026. Lowest monthly drug plan premium: $5.30 (2026: $4.70).
| Plan | Company | Monthly premium | Deductible | Star rating |
|---|---|---|---|---|
| Wellcare Value Script (PDP) | Wellcare | $5.30 | $700 | Not Applicable |
| AARP Medicare Rx Saver from UHC (PDP) | UnitedHealthcare | $10.30 | $700 | Not Applicable |
| Wellcare Classic (PDP) | Wellcare | $16.30 | $700 | Not Applicable |
| Humana Basic Rx Plan (PDP) | Humana | $18.30 | $700 | Not Applicable |
| Humana Value Rx Plan (PDP) | Humana | $33.30 | $687 | Not Applicable |
| HealthSpring Assurance Rx (PDP) | HealthSpring | $117.10 | $700 | Not Applicable |
| Humana Premier Rx Plan (PDP) | Humana | $123.00 | $350 | Not Applicable |
| MedicareBlue Rx Standard (PDP) | MedicareBlue Rx | $179.10 | $700 | Not Applicable |
| AARP Medicare Rx Preferred from UHC (PDP) | UnitedHealthcare | $222.90 | $300 | Not Applicable |
Sources
- Centers for Medicare & Medicaid Services, CY2027 Medicare Advantage and Part D Landscape file (data last updated 18 October 2026)
- Centers for Medicare & Medicaid Services, CY2026 Medicare Advantage and Part D Landscape file (September 2026 release)
- US Census Bureau, 2024 Gazetteer Files, counties
Checked 29 October 2026. Plans and premiums can change before 1 January 2027. Confirm any plan on Medicare.gov before you enrol.