Medicare Advantage

Medicare in Missoula: Your 2027 Enrollment Dates

MISSOULA, Mont. — If you live in Missoula and are sorting through Medicare choices for 2027, the calendar matters as much as the plan count. Missoula is in Missoula County, where 16 Medicare Advantage plans were available for 2026 — the 2027 lineup is in each plan's ANOC and on Medicare.gov's Plan Finder. Miss a date and you may wait months for another chance, sometimes with a lifelong penalty attached.

Here is how the 2026 enrollment windows line up, which ones apply to you, and what to do if a deadline slips by.

The window most Missoulians use: Oct. 15 – Dec. 7

The Annual Enrollment Period, or AEP, runs from October 15 through December 7 every year. This is when anyone with Medicare can:

• Join, switch, or drop a Medicare Advantage plan.
• Join, switch, or drop a stand-alone Part D drug plan.
• Move from Original Medicare to Medicare Advantage, or back the other way.

Any change you make during AEP takes effect January 1, 2027. If you do nothing, your current coverage generally rolls over — but the plan itself may have changed. Every fall, carriers send an Annual Notice of Change (ANOC) explaining what is different for the new year. Read it before December 7 so you are not surprised in January.

Missoula County had 16 Medicare Advantage plans on offer for 2026, spread across 2 carriers offering MA-PD (Medicare Advantage with drug coverage). For Original Medicare users who need drug coverage, Montana has 11 stand-alone Part D plans for 2026, sold statewide, and you can confirm the current lineup on medicare.gov. The 2027 lineup is in each plan's ANOC and on Medicare.gov's Plan Finder.

The second window: Jan. 1 – March 31

If you are enrolled in a Medicare Advantage plan on January 1, you get a bonus window called the Medicare Advantage Open Enrollment Period. From January 1 through March 31, you can:

• Switch to a different Medicare Advantage plan (one time).
• Drop your Medicare Advantage plan and return to Original Medicare, and add a stand-alone Part D plan if one is available to you.

This period is not open to people who stayed with Original Medicare during AEP. It is a safety valve for folks who tried a new Advantage plan and realized in January that the network or drug list does not work for them.

Turning 65 in 2027? Your Initial Enrollment Period

If you are aging into Medicare, your Initial Enrollment Period (IEP) is a seven-month window: the three months before your 65th birthday month, your birthday month, and the three months after. Sign up during the first three months and coverage starts the month you turn 65. Wait until later in the window and coverage can be delayed.

Two penalties can attach if you skip Part B or Part D without having other qualifying coverage (like an employer plan):

• Part B late penalty: 10% added to your premium for each full 12 months you were eligible but did not enroll. It usually lasts as long as you have Part B.
• Part D late penalty: roughly 1% of the national base premium per month you went without creditable drug coverage. It sticks to your Part D premium going forward.

Still working at 65? Special Enrollment Periods

If you kept employer coverage past 65, you generally get a Special Enrollment Period (SEP) to sign up for Part B without penalty — usually up to 8 months after the job or the group coverage ends, whichever comes first. For Part D, the window is shorter (typically 63 days). Do not assume COBRA counts as creditable coverage for Medicare timing purposes; it often does not.

Other SEPs apply if you move out of your plan's service area, lose Medicaid, qualify for Extra Help, or move into or out of a nursing facility.

What happens if you miss a deadline

Missing AEP is not the end of the world, but your options narrow:

• You keep whatever coverage you had, changes and all.
• You generally cannot switch plans again until the next AEP unless you qualify for an SEP.
• If you missed IEP entirely, there is a General Enrollment Period (January 1 – March 31) to sign up for Part B, with coverage starting the month after you enroll — but late penalties may apply.

The safest move: mark October 15 and December 7 on the calendar now, and open your ANOC when it arrives in September.

Where to get help in Missoula

You do not have to sort through 16 plans alone. Free, unbiased help is available:

• Medicare Plan Finder at medicare.gov lets you enter your prescriptions and pharmacy to compare plans.
• 1-800-MEDICARE (1-800-633-4227) is staffed 24/7.
• Montana SHIP (called SHIBA — State Health Insurance Benefits Advisors) offers free one-on-one counseling. It is not connected to any insurance company.

Also worth knowing: the Part D out-of-pocket cap is $2,100 in 2026 and $2,400 in 2027. The Part D deductible cannot exceed $615 in 2026 and $700 in 2027. The Medicare Prescription Payment Plan lets you spread drug costs across the year in monthly installments instead of paying at the pharmacy counter.