Montana has 19 Medicare Advantage plans available statewide in 2026, one of the smallest MA markets in the country. About 80,700 Montanans are enrolled in a Medicare Advantage plan in 2026, roughly 30% of the state's 270,000 Medicare-eligible residents, far below the national MA penetration rate of about 51%. Most Montana Medicare beneficiaries, about 70%, still rely on Original Medicare, often paired with a standalone Part D drug plan or a Medigap policy, a pattern more common in sparsely populated, frontier states.
Blue Cross and Blue Shield of Montana anchors the state's Medicare Advantage market in 2026, offering plans in 39 of Montana's 56 counties and carrying the broadest network of roughly 2,000 primary care providers, 7,000 specialists, and 200 hospitals and facilities statewide. UnitedHealthcare posts the lowest average premium of any Montana carrier, Humana carries the highest average Star Rating at 4.5 stars, and PacificSource Medicare, an Oregon-based regional insurer, concentrates its Montana footprint in the western part of the state around Flathead and Missoula counties. Aetna offers a single, more limited statewide PPO option.
Montana Medicare beneficiaries shopping in 2026 will find this guide covers how many plans are available, which carriers dominate, what to look for when comparing, county-level variance across Montana's vast rural geography, and the key enrollment dates. The Annual Election Period is October 15 to December 7, 2026, with coverage starting January 1, 2027.
2026 Medicare Advantage Market Overview in Montana
In 2026, Montana has 19 Medicare Advantage plans available, with 80,700 beneficiaries enrolled (30% MA penetration). The average monthly premium is $17 and the statewide average Star Rating is 4.0.
Top Medicare Advantage carriers in Montana (2026)| Carrier | Plans | Avg Star Rating | Avg Premium |
|---|
| Blue Cross Blue Shield of Montana | 7 | 4.0 | $15/mo |
| UnitedHealthcare | 5 | 4.0 | $12/mo |
| Humana | 4 | 4.5 | $20/mo |
| PacificSource Medicare | 2 | 4.0 | $22/mo |
| Aetna | 1 | 3.5 | $26/mo |
Source: KFF Medicare Advantage 2026 Spotlight, CMS Medicare Plan Finder Q4 2025 Montana data
Plan Types in Montana: HMO vs PPO vs SNP
Medicare Advantage plan-type breakdown in Montana| Plan Type | Plans Available | Avg Premium | Best For |
|---|
| HMO | 8 | $12/mo | Lower premiums in Billings, Missoula, Bozeman, and other Montana population centers |
| PPO | 8 | $24/mo | Flexibility to travel between Montana's frontier counties and regional hub hospitals |
| Special Needs Plan (SNP) | 2 | $0/mo | Dual-eligible (Montana Medicaid + Medicare), chronic conditions, institutional care |
| Medical Savings Account (MSA) | 1 | $0/mo | High-deductible plan with bank account; rare in Montana |
HMO and PPO plans are evenly split in Montana's 19-plan 2026 market, unlike most states where HMOs dominate. PPOs hold a larger share in Montana because they cover the state's frontier counties and regional hub hospitals in Billings, Missoula, and Great Falls.
Source: KFF Medicare Advantage 2026 Spotlight, CMS Medicare Plan Finder, Montana data
County-Level Variance in Montana
Plan availability in Montana varies more sharply by county than in almost any other state. Montana's largest counties, Yellowstone, Flathead, Missoula, and Gallatin, offer 13 to 16 of the state's 19 statewide plans, while several of Montana's least populated frontier counties have no Medicare Advantage plan at all. In 2026, six Montana counties have zero Medicare Advantage plans available, and residents there rely on Original Medicare plus a Medigap policy and a standalone Part D drug plan.
Plan count and average premium by county in Montana| County | Plans Available | Avg Premium |
|---|
| Yellowstone County | 15 | $10/mo |
| Flathead County | 16 | $12/mo |
| Missoula County | 14 | $14/mo |
| Gallatin County | 13 | $10/mo |
| Musselshell County | 0 | — |
Plan counts and premiums are from CMS Medicare Plan Finder Q4 2025 for Montana. Six Montana counties, including Musselshell County, currently have no Medicare Advantage plan offerings for 2026. Run a personalized search at medicare.gov to see exact plans for your ZIP code.
Source: CMS Medicare Plan Finder Q4 2025, Montana county data
What to Look For in a Medicare Advantage Plan in Montana
Picking a Medicare Advantage plan in Montana is not just about premium. Here's what matters for shopping in 2026:
- Provider network. Montana Medicare Advantage networks vary enormously by county. Confirm your primary care physician, specialists, and preferred hospital are all in-network before enrolling, especially if you regularly travel to Billings, Missoula, Great Falls, or out of state to Spokane or Salt Lake City for specialty care.
- Prescription drug coverage (formulary). Most Montana Medicare Advantage plans include Part D. Check that your specific medications are on the plan's formulary at a tier you can afford. The 2026 Part D out-of-pocket cap is $2,100 across all plans nationwide.
- Star Ratings. CMS rates plans 1 to 5 stars annually on quality of care, member experience, and customer service. Montana's statewide average is about 4.0 stars for 2026, and Humana consistently posts the highest Montana score at 4.5 stars.
- Extras (dental, vision, hearing, transportation, OTC allowance). Montana Medicare Advantage carriers differ widely on supplemental benefits. Some Billings and Missoula HMOs include generous dental and hearing aid allowances, while rural PPOs may offer thinner extras in exchange for a broader statewide travel network.
- Maximum out-of-pocket (MOOP). Medicare Advantage plans cap your annual in-network out-of-pocket spending. The 2026 federal MOOP ceiling for in-network MA is $9,250 (down $100 from $9,350 in 2025); Montana plans commonly set it in the $5,500 to $8,500 range. Original Medicare has no MOOP.
- Prior authorization burden. Montana Medicare Advantage plans can require prior authorization for surgeries, advanced imaging, and specialist referrals, which can add delays for frontier-county residents who must already drive long distances for that care. Ask how often the plan requires prior authorization and check denial rates published by CMS.
Key Medicare Dates in Montana
Montana Medicare and Medicare Advantage have several enrollment windows in 2026. Miss them and you may face delays in coverage or, for Part B, a permanent late-enrollment penalty.
- Annual Election Period (AEP): October 15 - December 7, 2026 — Switch between Original Medicare and MA, change MA plans, or change Part D plans. Coverage starts January 1, 2027.
- Medicare Advantage Open Enrollment Period (MA OEP): January 1 - March 31, 2026 — If you're already in a Montana MA plan, you can switch to a different MA plan or return to Original Medicare. One switch only.
- Initial Enrollment Period (IEP): 7-month window around your 65th birthday — Starts 3 months before your 65th birthday month, includes the birth month, and runs 3 months after. Enroll in Medicare Parts A and B, then choose MA or Original Medicare plus Part D.
- Special Enrollment Periods (SEPs): Varies by qualifying event — Triggered by moving out of your plan's Montana service area, losing employer coverage, qualifying for Montana Medicaid (dual eligible), or other life events. Also applies if you move into or out of one of Montana's six counties with no MA plans. Typically a 2-3 month window.
Notable Extras in Montana Plans
Montana Medicare Advantage plans and the state's health programs offer several Montana-specific features worth knowing about:
- Montana Medicaid HELP Act and dual eligibility: Montana expanded Medicaid eligibility in 2016 under the Health and Economic Livelihood Partnership (HELP) Act, extending coverage to adults earning up to 133% of the federal poverty level. Montana residents who qualify for both Montana Medicaid and Medicare are dual-eligible and can enroll in a federal Dual Special Needs Plan (D-SNP) offered by an MA carrier, typically with $0 premiums and $0 copays. Unlike some larger states, Montana does not run its own separate dual-coordination MA program, so D-SNP enrollment runs through medicare.gov Plan Finder like any other Montana Medicare Advantage plan.
- Montana SHIP free Medicare counseling: The Montana Department of Public Health and Human Services runs the State Health Insurance Assistance Program (SHIP), the state's federally funded, no-cost Medicare counseling service, through the Senior and Long Term Care Division and local Area Agencies on Aging. Montana SHIP counselors offer unbiased plan comparisons and enrollment help by phone or in person; call the Montana SHIP Medicare Helpline at 1-800-551-3191.
- Frontier geography, telehealth, and hub-hospital PPOs: Montana is the fourth-largest state by land area with one of the lowest population densities in the country, and several of its counties are classified as frontier (fewer than six residents per square mile). Most Montana Medicare Advantage plans in 2026 emphasize telehealth visits and mail-order pharmacy at no added cost to reduce travel burden, and PPO plans are structured to cover regional hub hospitals in Billings, Missoula, Great Falls, and Kalispell even when a member lives in a county with no local Medicare Advantage plan.
- Tribal health and Indian Health Service coordination: Montana is home to seven federally recognized Indian reservations. Native American Medicare beneficiaries can enroll in any Montana Medicare Advantage plan while continuing to receive care at Indian Health Service and tribal health facilities, which federal rules require MA plans to treat as in-network regardless of the plan's regular provider network. Montana Medicare Advantage enrollees who live on or near a reservation should confirm with their plan how IHS and tribal facility visits are billed and coordinated.
Medicare Advantage vs Original Medicare in Montana
Montana Medicare beneficiaries choosing between Original Medicare and Medicare Advantage face a sharper tradeoff than residents of most states. Original Medicare (Parts A and B) plus a Medigap supplement and a standalone Part D drug plan gives Montana residents nationwide provider freedom and no prior authorization for most services, but the combined Medigap and Part D premium in Montana commonly runs $190 to $360 a month. Medicare Advantage plans bundle hospital, medical, and usually drug coverage into one plan with a statewide average premium of $17 a month in 2026, though several Billings and Missoula HMOs charge $0.
Montana's frontier geography sharpens this choice more than in almost any other state. Residents of the six Montana counties with no Medicare Advantage plan, plus many other sparsely populated counties, effectively default to Original Medicare plus Medigap and Part D, since there is no local MA option to enroll in at all. Even in counties with MA plans, residents who split time out of state or need specialist care in Spokane, Salt Lake City, or Denver may value Original Medicare's nationwide network more than the lower premium of a Montana MA plan.
Montana Medicare beneficiaries who switch from Medicare Advantage back to Original Medicare during the Annual Election Period or the Medicare Advantage Open Enrollment Period should apply for Medigap immediately. Montana insurers can medically underwrite Medigap applications outside your initial Medigap open enrollment window or a guaranteed issue event, so a pre-existing condition could mean denial or a higher premium.
How Star Ratings work in Montana
Montana Medicare Advantage Star Ratings, like every state's, are published by CMS every October and graded 1 to 5 stars across roughly 40 quality measures covering chronic disease management, member complaints, customer service, and Part D drug safety. Plans that score 4 stars or higher receive CMS quality bonus payments, which typically translate into richer supplemental benefits, such as dental, vision, hearing, and OTC allowances, the following plan year.
Montana's 2026 statewide weighted-average Star Rating is about 4.0, roughly in line with the national average near 3.8. Humana carries the highest Montana rating at 4.5 stars, though Montana currently has no plan rated the rare full 5 stars, which would otherwise trigger a year-round Special Enrollment Period. Blue Cross Blue Shield of Montana, UnitedHealthcare, and PacificSource Medicare each hold a solid 4.0-star average in 2026, while Aetna trails at 3.5 stars with its single statewide PPO.
How to enroll in Montana Medicare Advantage
Montana residents enrolling in Medicare Advantage in 2026 follow the same federal process used nationwide, though plan availability differs sharply by county and six Montana counties have no MA option at all. Start at medicare.gov/plan-compare, CMS's personalized plan finder keyed to your Montana ZIP code, to see the exact plans, premiums, and Star Ratings available where you live.
- Step 1: Confirm you are already enrolled in Medicare Part A and Part B. You must have both before joining a Medicare Advantage plan. Montana residents newly turning 65 can use their Initial Enrollment Period to enroll in Parts A and B first.
- Step 2: Gather your documents. You will need: your Medicare card (showing your Medicare number and Part A/B effective dates), your Montana ZIP code (for plan availability), a list of current prescriptions (for formulary lookup), a list of current doctors and hospitals (for network check), and your Montana Medicaid card if you are dual-eligible.
- Step 3: Compare plans at medicare.gov/plan-compare. Filter by your Montana ZIP code. Sort by Star Rating, monthly premium, total estimated annual cost, or maximum out-of-pocket. Montana residents should also contact SHIP (State Health Insurance Assistance Program) for free, unbiased counseling before deciding.
- Step 4: Apply. You can enroll directly through medicare.gov, by calling 1-800-MEDICARE (1-800-633-4227), or through the carrier directly. Most online enrollments take 10 to 15 minutes.
- Step 5: Confirm your coverage start date. AEP enrollments start January 1, 2027. SEP enrollments typically start the first of the month after you enroll. You will receive a member ID card and Evidence of Coverage from the carrier within 7 to 10 business days.
- Common reasons Montana Medicare Advantage applications are delayed or denied: late Part B enrollment, a ZIP code inside one of the six Montana counties with no MA service area, missing Montana Medicaid eligibility documentation for D-SNP applicants, identity verification issues, and applying for a plan restricted to a different Montana county's network.
$0 premium plans in Montana for 2026
Montana has a small slate of $0 monthly premium Medicare Advantage plans in 2026, concentrated in Yellowstone, Missoula, Gallatin, and Flathead counties where UnitedHealthcare, Humana, and Blue Cross Blue Shield of Montana compete most directly. According to CMS enrollment area data, about 97% of Montana Medicare beneficiaries have access to at least one $0 monthly premium Medicare Advantage plan in 2026. $0 premium does not mean $0 cost: Montana enrollees in $0 premium plans still pay the 2026 Part B premium of $202.90 a month plus any drug copays, deductibles, and cost sharing built into the plan.
$0 premium plans in Montana for 2026 detail| Carrier | Plan Type | Star Rating | Counties Available |
|---|
| UnitedHealthcare | HMO | 4.0 | Yellowstone, Missoula, Gallatin |
| Blue Cross Blue Shield of Montana | HMO | 4.0 | Yellowstone, Cascade, Missoula |
| Humana | HMO | 4.5 | Yellowstone, Flathead |
| PacificSource Medicare | HMO | 4.0 | Flathead, Missoula, Lake |
Montana $0 premium plan availability sample for 2026. Full list at medicare.gov/plan-compare keyed to your ZIP code. Star Ratings reflect the 2026 plan year.
Source: Montana CMS Medicare Plan Finder Q4 2025
Special Needs Plans and dual eligibility in Montana
Montana Medicare beneficiaries who also qualify for Montana Medicaid are dual-eligible and can enroll in a Dual Special Needs Plan (D-SNP), which coordinates both programs into a single plan with $0 premiums, $0 primary care copays, and typically no prescription drug costs. Montana Medicaid expanded eligibility in 2016 under the HELP Act to adults earning up to 133% of the federal poverty level, which broadened the pool of Montanans who may qualify as dual-eligible once they turn 65 or become disabled.
Montana's 19-plan market includes a small number of Chronic Condition Special Needs Plans (C-SNPs) for beneficiaries with qualifying conditions such as diabetes or heart failure, though Institutional Special Needs Plans (I-SNPs) are rare given Montana's dispersed rural population. Montana dual-eligible beneficiaries get an added enrollment right: they can switch Medicare Advantage plans once per quarter in Q1 through Q3, plus again during AEP, giving more flexibility than beneficiaries who are not dual-eligible.
Frequently Asked Questions
How many Medicare Advantage plans are available in Montana in 2026?
Montana has 19 Medicare Advantage plans available statewide in 2026, one of the smallest MA markets in the country. The exact number available to you depends on your county and ZIP code. Flathead County offers 16 plans and Yellowstone County offers 15; six Montana counties, including Musselshell County, have no Medicare Advantage plans available at all. Run a ZIP-code search at medicare.gov to see your exact options.
What is the average Medicare Advantage premium in Montana for 2026?
The statewide weighted-average Medicare Advantage premium in Montana is about $17 per month in 2026, above the national MA average of $14. About 97% of Montana beneficiaries have access to at least one $0 monthly premium plan, mostly HMOs from UnitedHealthcare, Humana, and Blue Cross Blue Shield of Montana in Yellowstone, Missoula, Gallatin, and Flathead counties, while PPOs with broader statewide travel networks average $24 or more per month.
When can I sign up for Medicare Advantage in Montana?
The main enrollment window is the Annual Election Period (AEP) from October 15 to December 7, 2026, for coverage starting January 1, 2027. You can also enroll during your 7-month Initial Enrollment Period around your 65th birthday, or during a Special Enrollment Period triggered by events like moving, losing employer coverage, or qualifying for Montana Medicaid. Existing Montana MA enrollees can switch plans during the Medicare Advantage Open Enrollment Period (January 1 to March 31, 2026).
Who has the best Medicare Advantage plans in Montana?
Humana leads Montana in Star Ratings, with a 4.5-star average across its statewide plans. Blue Cross Blue Shield of Montana, the state's largest domestic insurer, covers the most counties (39 of 56) and holds a solid 4.0-star average, as do UnitedHealthcare and PacificSource Medicare. UnitedHealthcare offers the lowest average premium. The best plan for you depends on your doctors, your medications, and how far you're willing to travel for specialty care in a state this large.
Can I switch from Medicare Advantage back to Original Medicare in Montana?
Yes. You can switch back during the Annual Election Period (October 15 to December 7) or the Medicare Advantage Open Enrollment Period (January 1 to March 31). However, returning to Original Medicare does not automatically guarantee you can buy a Medigap policy: Montana insurers can medically underwrite Medigap applications outside your initial Medigap open enrollment window unless you have a guaranteed issue right, so a pre-existing condition could mean denial or a higher premium. Plan ahead and apply for Medigap immediately after disenrolling.
What is the difference between an HMO and a PPO in Montana Medicare Advantage?
HMOs (8 of Montana's 19 plans) require you to use in-network providers and usually need a referral to see a specialist. They offer lower premiums (average $12/mo) and are concentrated in Billings, Missoula, and Bozeman. PPOs (also 8 plans) let you see out-of-network providers at a higher cost share and don't require referrals, which matters in a state where residents often travel between frontier counties and regional hub hospitals; PPOs average $24/mo. Choose HMO for lower cost in a dense network; choose PPO for flexibility to travel across Montana.
Does Medicare Advantage cover prescription drugs in Montana?
Most Montana Medicare Advantage plans include Part D prescription drug coverage built in. These are called MA-PD plans. The 2026 Part D annual out-of-pocket maximum is $2,100 across all plans nationwide (set by the Inflation Reduction Act, signed August 16, 2022). Always check the plan's formulary to confirm your specific medications are covered, and at what tier.
Are dental, vision, and hearing covered by Medicare Advantage in Montana?
Most Montana Medicare Advantage plans include some level of dental, vision, and hearing benefits, which Original Medicare does not cover. Coverage varies widely: some Billings and Missoula plans cover cleanings, exams, hearing aids, and prescription eyewear, while some rural PPOs offer thinner extras. Always check the Evidence of Coverage for annual dollar limits and what's actually covered.
What is a Special Needs Plan (SNP) and who qualifies in Montana?
A Special Needs Plan (SNP) is a type of Medicare Advantage plan designed for people with specific needs. Montana offers Dual Special Needs Plans (D-SNPs) for residents who qualify for both Medicare and Montana Medicaid, and a small number of Chronic Condition Special Needs Plans (C-SNPs) for people with qualifying conditions like diabetes or heart failure. SNPs made up 2 of Montana's 19 Medicare Advantage plans in 2026, and most charge $0 premium to eligible members. Montana residents on or near one of the state's seven tribal reservations can also use Indian Health Service and tribal health facilities alongside any Montana Medicare Advantage plan.
