Medicare Advantage

Medicare's Drug Cap in 2027: Missoula, MT Guide

Medicare drug coverage in 2027: how the out-of-pocket cap works for Missoula residents choosing plans this fall.

MISSOULA — If you've heard that Medicare's prescription drug costs have a hard yearly ceiling, that part is true. The cap was $2,100 in 2026 and rises to $2,400 in 2027. But talk to enough neighbors around Missoula, and you'll hear a lot of half-right ideas about how the cap actually works — who it covers, what counts toward it, and what it doesn't touch. Getting those details straight during this fall's Annual Enrollment can save you a stressful phone call in February.

Misunderstanding #1: "The Part D cap covers all my medical costs."

It doesn't. The cap is a Part D rule, so it only applies to prescription drugs covered under your Part D plan (or the drug portion of a Medicare Advantage plan that includes drugs). Doctor visits, hospital stays, lab work, and other Part A and Part B costs are separate and have their own rules.

Drugs given in a clinic or hospital — like many infusions — are usually billed under Part B, not Part D, so those don't count toward the $2,100 in 2026 ($2,400 in 2027) either.

Misunderstanding #2: "My monthly premium counts toward the cap."

Also no. The $2,100 in 2026 ($2,400 in 2027) tracks what you pay at the pharmacy for covered drugs — deductibles, copays, and coinsurance. Your monthly plan premium is separate and keeps being due even after you hit the cap.

One more thing worth knowing: the Part D deductible can be up to $615 in 2026 and up to $700 in 2027. Plans can charge less, but no plan can charge more.

Misunderstanding #3: "The donut hole is why my drug costs spike mid-year."

The coverage gap — the old "donut hole" — was eliminated in 2025. Part D now has three phases: the deductible, the initial coverage phase, and catastrophic coverage. Once your out-of-pocket spending hits the yearly cap ($2,100 in 2026, $2,400 in 2027), you're in catastrophic coverage and pay nothing more for the rest of the year on covered drugs.

If someone tells you they're "stuck in the donut hole," they're describing a rule that no longer exists.

Misunderstanding #4: "I have to pay the whole $2,100 (2026; $2,400 in 2027) up front in January."

You don't. And this is where the Medicare Prescription Payment Plan comes in. It's an optional program that lets you spread your yearly drug costs across monthly payments to your plan instead of paying the full amount at the pharmacy each time. You still owe the same total — it's just billed differently. For people with an expensive medication early in the year, it can smooth out the cash-flow hit.

You have to opt in. Ask your Part D or Medicare Advantage drug plan how to sign up.

Misunderstanding #5: "Every drug I take counts toward the cap."

Only drugs that are on your plan's formulary — the list of drugs it covers — count toward the $2,100 in 2026 ($2,400 in 2027). If you fill a prescription your plan doesn't cover, or use a pharmacy outside your plan's network, that spending may not count.

This is why comparing formularies during Annual Enrollment matters. Two plans can look similar on paper and treat your specific medications very differently.

Misunderstanding #6: "Higher-income folks pay the same as everyone else."

The cap ($2,100 in 2026, $2,400 in 2027) is the same for everyone, but higher earners pay an extra premium surcharge called IRMAA. In 2026, IRMAA kicks in above $109,000 in income for a single filer (higher for couples). It's added to your Part B and Part D premiums, based on your tax return from two years earlier.

What Missoula County residents should know about their options

Missoula is in Missoula County, where CMS's 2026 plan data shows 16 Medicare Advantage plans available and 2 carriers offering Medicare Advantage plans with drug coverage. Montana has 11 stand-alone Part D plans for 2026, sold statewide, so anyone in Missoula County with Original Medicare can join one of them. The 2027 lineup will appear in each plan's Annual Notice of Change and on Medicare.gov's Plan Finder — worth confirming for your ZIP code before you assume anything. Roughly 20,683 people 65 and older live in the county, so you're far from alone in sorting through this.

The number of plans isn't a measure of quality — it's just what's on the shelf. What matters is how a given plan handles your drugs, your doctors, and your budget.

How to decide during Annual Enrollment

Annual Enrollment runs October 15 through December 7, 2026, and choices made in that window take effect January 1, 2027. If you're already in a Medicare Advantage plan, you also get the Medicare Advantage Open Enrollment Period from January 1 to March 31, 2027 to switch once.

A short checklist:

• List every prescription you take, with dose and frequency.
• Use the Plan Finder tool at Medicare.gov to see which plans cover your drugs and which pharmacies are in network.
• Ask whether the Medicare Prescription Payment Plan makes sense for your situation.
• If your income is limited, ask about Extra Help, which can lower drug costs further.