Medicare Part D

Medicare Supplement coverage rules for Helena retirees

HELENA, Mont. — Picking how you receive your Medicare benefits is one of the bigger decisions you'll make as a retiree, and it's not always obvious how the two main paths differ. In Helena, where winters are long and specialists sometimes mean a drive, the choice often comes down to how you want your coverage structured — not which plan has the shiniest brochure.

Here's a plain-language walk-through of the two roads, plus the program figures you should have in hand before you decide for 2027.

The two paths, side by side

Original Medicare is the federal program itself — Part A (hospital) and Part B (doctor and outpatient). You can see any provider in the country that accepts Medicare, and there's no network. Because Original Medicare doesn't cap your out-of-pocket costs on its own, most people pair it with a Medigap (Medicare Supplement) policy to cover coinsurance and deductibles, and a stand-alone Part D plan for prescriptions.

Medicare Advantage (Part C) is Medicare delivered through a private insurer approved by CMS. These plans bundle Part A, Part B, and usually Part D into one package. They typically use networks (HMO or PPO) and have their own copays, referrals, and prior-authorization rules. They also include an annual out-of-pocket maximum for medical care, which Original Medicare alone does not.

Neither path is "better." They're built differently, and the right fit depends on your health, your travel patterns, and how you feel about networks vs. premiums.

What's actually available around Helena

Helena is in Lewis and Clark County, where plan availability — the number of Medicare Advantage and Part D options offered — is set at the county level by CMS each year. If you want to know exactly how many plans are on the shelf for 2027, the plan finder at medicare.gov lets you enter your ZIP code and see the current count. Availability changes every fall, so a plan that was offered in Lewis and Clark County last year may or may not be there this year. Your plan's Annual Notice of Change will also spell out what's different for 2027.

The program figures to know

Whichever path you're weighing, these program-level figures apply:

• Part D out-of-pocket cap: $2,100 in 2026 and $2,400 in 2027. Once your covered drug costs hit that ceiling, you pay nothing for covered drugs the rest of the year.
• Part D maximum deductible: $615 for 2026 and $700 for 2027 (plans can set theirs lower).
• The coverage gap ("donut hole") is gone as of 2025. Part D now has three phases instead of four.
• Medicare Prescription Payment Plan: an optional program that lets you spread your drug costs across the calendar year in monthly payments instead of paying at the pharmacy counter.
• IRMAA surcharges — the income-related add-ons to Part B and Part D premiums — begin above $109,000 for a single filer in 2026 (based on your 2024 tax return).

Common mistakes people make

Assuming you can switch back easily. You can move from Original Medicare to Medicare Advantage during Annual Enrollment. But if you later want to leave Advantage and buy a Medigap policy, in most states — Montana included — insurers can medically underwrite you outside of your initial six-month Medigap open enrollment window. That means you could be denied or charged more based on health. This is the single biggest structural trap in the system.

Forgetting about Part D when choosing Original Medicare + Medigap. Medigap does not cover prescriptions. If you go that route, you generally need a stand-alone Part D plan, or you risk a late-enrollment penalty down the road.

Ignoring networks when choosing Advantage. If you split time with family out of state, or you already see a specialist in Missoula or Seattle, confirm whether that provider is in-network before enrolling.

Missing the deadlines.

• Annual Enrollment Period: October 15 – December 7 (changes take effect January 1).
• Medicare Advantage Open Enrollment: January 1 – March 31 (a one-time switch if you're already in an Advantage plan).

How to think it through

Ask yourself:

1. Do I travel or split time between states? Original Medicare's nationwide access may matter more than bundled extras. 2. Do I want predictable monthly costs, or am I comfortable paying more only when I use care? Medigap tends toward higher premiums and lower surprise bills; Advantage tends the other way. 3. What are my prescriptions? Run them through the medicare.gov plan finder — the same drug can be cheap in one plan and expensive in another. 4. How do I feel about referrals and prior authorization? Advantage plans use them; Original Medicare generally does not.