Montana health insurance Marketplace guide

To enroll in private health coverage through Montana’s Marketplace (HealthCare.gov), you must:⁵

• Live in Montana and be lawfully present in the United States
• Not be incarcerated
• Not have Medicare coverage 

So most people are eligible to enroll in Marketplace coverage. But qualifying for financial assistance (premium subsidies and cost-sharing reductions) is a bit more complex. Eligibility for financial assistance depends on your income, and you must also:

• Not have access to affordable health coverage offered by an employer. If you’re eligible to enroll in an employer-sponsored plan but it seems too expensive, you can use our Employer Health Plan Affordability Calculator to see if you might qualify for premium subsidies in the Marketplace. 
• Not be eligible for Medicaid or CHIP (Montana Healthy Kids).
• Not be eligible for premium-free Medicare Part A.⁶
• If married, file a joint tax return with your spouse.⁷
• Not be able to be claimed by someone else as a tax dependent.⁷

You can sign up for an ACA-compliant individual or family health plan in Montana during the annual open enrollment period. The next open enrollment period will run from November 1 – December 15, 2026, for coverage effective January 1, 2027. This is shorter than the window that was used for the last several years, due to a federal rule change finalized in 2025.

Outside of the open enrollment period, you may still be eligible to enroll or make a plan change if you experience a qualifying life event, such as giving birth or losing other health coverage. American Indians and Alaska Natives can enroll year-round without a qualifying life event.

Enrollment in Montana Medicaid and Healthy Montana Kids (CHIP) is available year-round.⁸ If you’re eligible for either program, you can enroll anytime.

To enroll in an ACA Marketplace (exchange) plan in Montana, you can: 

• Visit HealthCare.gov, which is Montana’s Marketplace (exchange). This platform lets Montana residents comparison shop for health coverage, determine subsidy eligibility, and select the plan that best meets their needs.
• Enroll in Marketplace coverage with the help of an insurance agent or broker, or a Navigator or certified application counselor.
• Enroll via an approved enhanced direct enrollment entity (EDE).⁹ (EDEs can also offer off-exchange plans and non-ACA-compliant plans, so be sure to specify that you want to enroll in Marketplace/exchange coverage, as that’s the only way to obtain any subsidies for which you might be eligible.)

You can also call HealthCare.gov’s contact center by dialing 1-800-318-2596 (TTY: 1-855-889-4325). The call center is available 24 hours a day, seven days a week, except for holidays.

You may find affordable health insurance coverage in Montana by enrolling through HealthCare.gov. This is especially true if you qualify for subsidies, and most enrollees in Montana are subsidy-eligible. 

The Affordable Care Act created income-based premium subsidies called Advance Premium Tax Credits (APTC).¹⁰ If you’re eligible for APTC, it will reduce the amount you owe in premiums each month – potentially even to $0, depending on your income, age, and the plan you select.

During the open enrollment period for 2025 coverage, nearly nine out of ten Montana Marketplace enrollees were eligible for APTC. These subsidies paid an average of $543/month, reducing the average subsidy-eligible enrollee’s premium to about $102/month.¹¹

But federal subsidy enhancements expired at the end of 2025. Most enrollees still qualify for subsidies (although not as many as in 2025), but after-subsidy premiums are significantly higher as a result of the expiration of the subsidy enhancements.

In addition to premium subsidies, you may also qualify for cost-sharing reductions (CSR) if your household income isn’t more than 250% of the federal poverty level. CSR subsidies will make the deductible and other out-of-pocket expenses (for a Silver-level plan) smaller than they would otherwise be. Thirty-three percent of Montana’s Marketplace enrollees were receiving CSR benefits in 2025.¹²

You can combine APTC and CSR benefits if you’re eligible for both, as long as you select a Silver-level plan (APTC can be used with plans at any metal level, but CSR benefits are only available on Silver plans). 

Source: CMS.gov¹¹

Montana implemented a reinsurance program in 2020, which resulted in overall average rate decreases that year and relatively flat rates the following year.¹³ So if you’re not eligible for premium subsidies in Montana, the reinsurance program does ensure that your premiums are lower than they would otherwise be.

Depending on your income and circumstances, you may find that you’re eligible for free or low-cost health coverage through Montana Medicaid or Healthy Montana Kids (CHIP). Check to see if you meet the criteria for these programs in Montana.

Three private insurance companies offer Marketplace health insurance coverage in Montana in 2026.¹⁴ 

• BCBS of Montana (Health Care Service Corporation)
• Montana Health CO-OP
• PacificSource

One of Montana’s insurers, Montana/Mountain Health CO-OP, is among just three ACA-created CO-OPs still in operation nationwide.

The following average premium changes were approved for 2026 for the insurers that offer individual/family health insurance in Montana, amounting to a weighted average increase (before subsidies are applied) of 29.1%.¹⁵

Source: Federal rate review database¹⁴ and ACA Signups¹⁵

Average rate increases are for full-price plans. Most Marketplace enrollees in Montana receive income-based premium tax credits that cover some or all of their monthly premium costs.¹²

The subsidy amounts change each year. For 2026, they no longer cover as much of enrollees’ total premiums, and are available to fewer people because Congress did not extend the federal subsidy enhancements that expired at the end of 2025. This means Marketplace enrollees in Montana (and throughout the country) are paying significantly higher premiums in 2026.¹⁵

For perspective, here’s an overview of how average full-price premiums have changed in Montana’s individual/family health insurance market over the years:

• 2015: Average increase of 3%.¹⁶
• 2016: Average increase of 25.9%.¹⁷
• 2017: Average increase of 47.6%.¹⁸
• 2018: Average increase of 19.5%.¹⁹
• 2019: Average increase of 5.7%.²⁰
• 2020: Average decrease of 13.1%.²¹ (reinsurance program took effect)
• 2021: Average increase of 1.4%.²²
• 2022: Average increase of 0.5%.²³
• 2023: Average increase of 9.6%.²⁴
• 2024: Average increase of 4.9%²⁵
• 2025: Average increase of 8.3%²⁶

During the open enrollment period for 2026 coverage, 73,255 people enrolled in plans through Montana’s exchange.²⁷ This was down from a record high of 77,221 the year before.²⁸ 

As shown in the graph below, enrollment had been trending higher for the last several years, before declining in 2026. The previous enrollment increases were driven in large part by the federal subsidy enhancements that were available between 2021 and 2025.

The enrollment spike in 2024 and 2025 was also driven partly by the “unwinding” of the pandemic-era pause on Medicaid disenrollments. For three years during the pandemic, people were not disenrolled from Medicaid even if they were no longer eligible. That ended in the spring of 2023, and some people who were previously enrolled in Medicaid shifted to Marketplace coverage insteat.

Source: 2014,²⁹ 2015,³⁰ 2016,³¹ 2017,³² 2018,³³ 2019,³⁴ 2020,³⁵ 2021,³⁶ 2022,³⁷ 2023,³⁸ 2024,³⁹ 2025²⁸

HealthCare.gov
The Marketplace in Montana, where residents can enroll in individual/family health coverage and receive income-based subsidies. You can reach HealthCare.gov at 800-318-2596.

Montana Commissioner of Securities and Insurance
Licenses and regulates health insurance companies, agents, and brokers; can provide assistance to consumers who have questions or complaints about entities the Commissioner regulates.

Montana Primary Care Association
Montana’s federally funded Navigator organization

Montana State Health Insurance Assistance Program
A local service that provides assistance and enrollment counseling for Medicare beneficiaries and their caregivers.

Montana Medicaid and Healthy Montana Kids
(Montana’s Children’s Health Insurance Program)