Turning 65 in Idaho: Your Complete Medicare Checklist

Every week, someone sits down across from us at our office on Federal Way, slides a grocery bag of Medicare mail across the table, and says some version of: "I don't even know where to start." If that's you — welcome. You're normal, the bag of mail is normal, and the feeling that everyone else somehow understands this is an illusion. Nobody understands it until someone walks them through it.

So let's walk through it. This guide is the exact countdown we'd give a neighbor: what to do a year out, six months out, three months out, and in your birthday month — plus the Idaho-specific stuff (SHIBA, Your Health Idaho, our Medigap birthday rule, St. Luke's vs. St. Alphonsus networks) that national articles never mention. Grab a pen. There will be checkboxes.

When should I start preparing for Medicare?

Start about 12 months before your 65th birthday. Your actual enrollment window — the 7-month Initial Enrollment Period — doesn't open until 3 months before your birthday month, but the decisions that shape your enrollment (keep working coverage or not, HSA timing, Medigap vs. Medicare Advantage) are much easier with a year of runway.

Can you do it all in three months? People do it every day, and if your birthday is close, don't despair — call us and we'll compress the timeline. But the folks who start early get two luxuries: time to fix surprises (a missing work-history record at Social Security, an HSA that needed to stop sooner), and time to make the big coverage decision calmly instead of at deadline pressure with a mailbox full of ads shouting at them.

One reassuring fact before the countdown: for most people, turning 65 involves exactly two real decisions — when to enroll (now, or later because you're still working) and how to receive benefits (Original Medicare with a supplement, or Medicare Advantage). Everything else on the checklist is just paperwork in service of those two choices. Keep that in mind whenever the process starts feeling like a second job.

What does the month-by-month countdown look like?

Here's the full countdown. Months are approximate — Medicare won't fine you for confirming your Social Security status in month 11 instead of 12 — but the order matters, and a few items (looking at you, HSA) genuinely are time-sensitive.

12 to 9 months out: get your bearings

• Create (or dust off) your my Social Security account at ssa.gov and confirm your earnings record shows the roughly 10 years (40 quarters) of work that make Part A premium-free for most people.
• Note whether you'll be drawing Social Security by 65 — it determines whether enrollment is automatic (more below).
• If you're still working: find out whether your employer has 20 or more employees, and ask HR whether the drug coverage is "creditable." Get that in writing — you'll want the notice later.
• If you have a Health Savings Account and might delay Medicare: read the HSA section below now. Twice.
• Start a Medicare folder — paper or digital — for notices, letters, and the comparison notes you're about to generate.
• If you plan to retire before 65, sketch your bridge coverage through Your Health Idaho (details below).

9 to 6 months out: learn the fork in the road

• Read up on the two paths: Original Medicare + Medigap + Part D vs. Medicare Advantage. (Our Idaho comparison article covers it in depth.)
• List your doctors, clinics, and hospital preference — St. Luke's, St. Alphonsus, or both — and your must-keep specialists.
• List your prescriptions with exact names, dosages, and your preferred pharmacy.
• Ballpark your 2024 tax return income — 2026 IRMAA surcharges are based on it (explained below), and knowing early prevents a rude letter later.
• If delaying Part A because you want to keep contributing to an HSA, plan your final HSA contribution date — contributions must stop about 6 months before Part A takes effect.

6 to 4 months out: make the timing decision

• Decide: enroll at 65, or delay because of employer coverage from a 20+ employee company. Small employer? Plan to enroll.
• If delaying anything, confirm in writing that your employer drug coverage is creditable — that's your shield against the Part D penalty.
• If enrolling at 65 and you have an HSA: stop HSA contributions now (6 months before your birthday month) if you haven't already.
• Ask two or three retired friends what they chose and what surprised them. Not for the advice — for the calibration. Everyone's situation differs, and hearing that out loud is useful.

3 months out to birthday month: enroll and choose plans

• Your Initial Enrollment Period opens 3 months before your birthday month. Enrolling in these first 3 months means coverage starts the 1st of your birthday month — no gap. (Full effective-date rules are in our enrollment periods guide.)
• Not auto-enrolled? Apply for Parts A and B at ssa.gov, by phone at 1-800-772-1213, or at the Boise Social Security office.
• Choose your path and enroll: a Medigap plan plus Part D drug plan, or a Medicare Advantage plan.
• Run your drug list through the plan finder (or let us do it) to confirm your pharmacy and prescriptions are covered affordably.
• Watch the mail for your red, white, and blue Medicare card; guard the number like a credit card.

After your birthday: tie the bow

• Confirm your premium payments are set up (deducted from Social Security if you're drawing it; otherwise quarterly bills or Medicare Easy Pay).
• Give your new insurance cards to your doctors and pharmacy.
• Book your free "Welcome to Medicare" preventive visit within the first 12 months.
• Calendar two recurring dates: October 15 (Annual Enrollment Period — review your drug or Advantage plan yearly) and, if you chose Medigap, your birthday (Idaho's annual rate-shopping window).
• Shred nothing yet — keep enrollment confirmations for at least the first year.

Am I automatically enrolled in Medicare at 65?

Only if you're already receiving Social Security or Railroad Retirement benefits. In that case, Medicare enrolls you in Parts A and B automatically, coverage begins the first day of your 65th-birthday month, and your card simply arrives in the mail about 3 months ahead. If you haven't started Social Security — increasingly the norm — nothing happens automatically, and you must apply yourself.

This is the single most common misunderstanding we untangle. So many people assume "the government knows my birthday, surely they'll sign me up." The government does know your birthday. It will still not sign you up unless you're already in its payment system. If you're delaying Social Security to grow your benefit (a perfectly good strategy for many people), you and Medicare have to be introduced manually — at ssa.gov, by phone, or at the local office.

Two footnotes. First, if you're auto-enrolled but still working with employer coverage, you can decline Part B by following the instructions that come with your card — just make sure you actually qualify to delay before you do. Second, auto-enrollment covers Parts A and B only. Nobody is ever auto-enrolled in a Part D drug plan, a Medigap plan, or a Medicare Advantage plan. Those are always your move.

What if I'm still working when I turn 65?

If you or your spouse works for an employer with 20 or more employees and you're covered by its group plan, you can usually delay Part B (and Part D, if the drug coverage is creditable) without penalty, then use an 8-month Special Enrollment Period when the employment or coverage ends. If the employer has fewer than 20 employees, Medicare generally becomes your primary coverage at 65 — so enrolling is usually essential.

The 20-employee line is the whole ballgame, and it's not arbitrary — it decides who pays your claims first:

• 20+ employees: the group plan pays first, Medicare second. Your employer coverage is real primary coverage, so delaying Part B is safe and saves you the premium. Many people in this camp still take premium-free Part A (unless preserving HSA eligibility — see below).
• Under 20 employees: Medicare pays first — even if you never enrolled. The group plan can legally pay as if Medicare had covered its share, leaving you responsible for the gap. Skipping Part B here can mean shockingly large bills plus a future late penalty. If this is you, please treat Part B at 65 as the default and talk to your plan, SHIBA, or us before doing anything else.

And remember: COBRA and retiree coverage do not count as active employer coverage. They don't earn you the 8-month Special Enrollment Period, no matter how employer-flavored they feel.

The HSA trap (read this twice)

If you have a Health Savings Account, here's the rule that catches smart, diligent people every single year: once any part of Medicare starts — even premium-free Part A — you can no longer contribute to your HSA. Spending existing HSA money is fine forever; contributing is not.

The trap has a second jaw. If you delay Medicare past 65 and enroll later (or file for Social Security later, which triggers Part A), your Part A is backdated up to 6 months. That means contributions you made in those backdated months retroactively become excess contributions, with tax penalties attached. The fix is simple but requires foresight: stop HSA contributions about 6 months before you enroll in Medicare or file for Social Security, and prorate your final year's contribution limit for the months you were actually eligible. Say you're planning to retire in June at 66 and file for Social Security — your last clean HSA contribution month is likely the previous December. Your CPA will happily confirm the math; the point is to have this conversation before the contributions happen, not at tax time after.

Should I choose Original Medicare with Medigap, or Medicare Advantage?

This is the big fork in the road. Original Medicare + a Medigap plan + a Part D drug plan gives you nearly any doctor who takes Medicare nationwide and highly predictable costs, for a higher monthly premium. Medicare Advantage bundles everything (often with dental, vision, and drug coverage) for low or $0 plan premiums, in exchange for provider networks and cost-sharing as you go. Neither is "the good one" — they fit different people.

We wrote a whole article comparing the two paths for Idaho specifically — Medicare Advantage vs. Medicare Supplement in Idaho — so here's just the decision skeleton:

• Original Medicare + Medigap + Part D tends to fit people who travel a lot, split time between states, want to see specialists anywhere without referrals, or simply want maximum cost predictability and are comfortable paying a monthly premium for it.
• Medicare Advantage tends to fit people who stay local, whose doctors are in-network, who like one card and one plan with extras bundled in, and who prefer low fixed premiums over premium-heavy predictability.
• Timing tip: your 6-month Medigap open enrollment window — the only time Idaho insurers must accept you regardless of health — starts when your Part B begins. If Medigap is even a maybe for you, that window is when to grab it.

Whichever way you lean, make the choice on purpose. The people who end up unhappy are rarely the ones who chose "wrong" — they're the ones who let a TV commercial or a default choose for them.

What does Medicare cost in 2026?

For the 2026 plan year, per CMS: most people pay $0 for Part A (thanks to 10+ years of payroll taxes) but face a $1,736 hospital deductible per benefit period; the standard Part B premium is $202.90 a month with a $283 annual deductible; Part D premiums vary by plan, with annual out-of-pocket drug costs capped at $2,100. Medigap and Medicare Advantage costs vary by plan and county.

That uncapped 20% under Original Medicare alone is exactly why the Medigap-or-Advantage decision exists — going "bare" with only Parts A and B leaves your worst-case year unlimited, which is why almost nobody should stop there.

A gentle word about IRMAA

IRMAA — the Income-Related Monthly Adjustment Amount — is a surcharge added to Part B and Part D premiums for higher-income households. For 2026, it starts when your modified adjusted gross income from two years back (your 2024 return) exceeds roughly $109,000 for a single filer — about double that for couples filing jointly — and it steps up through several tiers from there. Cross a threshold by a dollar and you pay that whole tier's surcharge, which is why retirees with big one-time income events (a house sale, a large Roth conversion) sometimes get startled letters from Social Security.

Two comforts. First, most Idahoans never pay IRMAA at all. Second, if your income has dropped since that two-year-old tax return because of a "life-changing event" — retirement being the classic one — you can file form SSA-44 and ask Social Security to use your current, lower income instead. It works more often than people expect. If your income is anywhere near six figures, just flag it in our conversation and we'll walk through it — no spreadsheet dread required.

What Idaho-specific resources should I know about?

Three things every Idahoan turning 65 should have on their radar: SHIBA, the state's free Medicare counseling service; Your Health Idaho, the state exchange that bridges you to 65 if you retire early; and Idaho's Medigap birthday rule, which lets supplement policyholders rate-shop annually without health questions.

SHIBA: free, unbiased counseling

SHIBA — Senior Health Insurance Benefits Advisors — is Idaho's State Health Insurance Assistance Program (SHIP), operated through the Idaho Department of Insurance. Trained counselors answer Medicare questions by phone and at events around the state, free, with no sales angle whatsoever. We're a commission-based agency and we still recommend SHIBA constantly, because an informed client is our favorite kind. Use both: SHIBA for neutral education, a licensed local agent for plan-by-plan comparison and enrollment help.

Retiring before 65? Your Health Idaho is your bridge

If you retire at 62 or 63, you need something between the employer plan and Medicare. In Idaho, individual coverage runs through Your Health Idaho — our state-based exchange (Idahoans don't use HealthCare.gov). Leaving employer coverage is a qualifying life event that opens a special enrollment window, and depending on your retirement income you may qualify for meaningful premium tax credits. We've seen early retirees assume COBRA was the only option and overpay for months. Compare first — our Your Health Idaho guide walks through it.

The Idaho Medigap birthday rule

Once you own a Medigap plan, Idaho gives you a gift each year: starting around your birthday, roughly a 63-day window to switch to any carrier's Medigap plan of equal or lesser benefits — no medical underwriting (in effect since March 2022, per the Idaho Department of Insurance). Translation: if your carrier raises rates, you can shop the same plan letter across companies annually and keep the coverage while cutting the premium. Put it on the calendar next to your cake.

How do I make sure I can keep my Treasure Valley doctors?

If you choose Original Medicare plus Medigap, networks mostly don't apply — you can see any provider in the country who accepts Medicare, which includes the vast majority of Treasure Valley doctors. If you choose Medicare Advantage, the plan's network decides which doctors and facilities are covered at in-network rates, so you must verify your providers before enrolling — every year, not just once.

Here in Ada and Canyon County, the practical question is usually about the two big systems: St. Luke's and St. Alphonsus (plus independents like Treasure Valley Medical and various specialty groups). Some Medicare Advantage plans in our area contract with both systems; others lean toward one. If your cardiologist is at St. Luke's Meridian and your spouse's orthopedist is at St. Alphonsus in Nampa, that single fact can narrow your realistic plan list considerably — and it's much better to learn that in September than in a waiting room in February.

Our verification routine, which you're welcome to steal:

• Write down every provider you actually see — primary care, specialists, the clinic locations themselves, and your hospital preference.
• Check each one in the plan's current-year online directory — then confirm by calling the provider's office and asking, "Are you in-network with this specific plan next year?" Directories lag; front desks know.
• Ask how the plan handles referrals and prior authorizations — two plans with identical networks can feel very different to use.
• Recheck every fall during the Annual Enrollment Period. Network contracts change yearly, and your plan's Annual Notice of Change will hint at what's shifting.

This is also, frankly, where a local agent earns their keep — we live in these networks all day and serve clients across Ada County, Canyon County, and beyond, so we usually know which plans play nicely with which systems before the directories catch up.

How do I match a drug plan to my prescriptions and pharmacy?

Never pick a drug plan by its premium alone. The right way: list every prescription with exact name and dosage, name your preferred pharmacy, and run that list through Medicare's plan finder (or hand it to an agent). The best plan is the one with the lowest total annual cost — premium plus copays — for your specific drugs at your specific pharmacy.

Two plans with identical premiums can differ by over a thousand dollars a year for the same person, because each plan has its own formulary (covered-drug list), its own tier placements, and its own network of "preferred" pharmacies where copays drop. Your neighbor's beloved plan may be wrong for you purely because you fill at the pharmacy across the street from hers.

Checklist for the drug-plan step:

• Confirm every drug is on the plan's formulary — and note the tier, which drives your copay.
• Check whether your pharmacy is preferred (cheapest), merely in-network, or out-of-network — whether that's a Fred Meyer or Albertsons pharmacy in Boise, a Costco run, or an independent in Idaho City.
• Compare mail-order pricing — 90-day fills are often the quiet money-saver.
• Look for restrictions like prior authorization or step therapy on your drugs.
• Remember the 2026 out-of-pocket cap: once covered drug costs hit $2,100 for the year, covered drugs cost you $0 for the rest of it — a genuinely big deal for anyone on expensive medications.
• Re-shop every fall. Formularies and pharmacy networks reshuffle annually, and the Part D plan that wins for you this year may not win next year.

Even if you take zero medications today, enroll in a low-premium Part D plan anyway (or confirm you have creditable coverage). Going bare triggers a late penalty of 1% of the national base premium per month, forever — cheap insurance against both future prescriptions and permanent surcharges.

How do I spot Medicare enrollment scams?

The golden rule: Medicare will not call you. It doesn't phone to "verify your Medicare number," "activate your new card," or sell you anything — it communicates by mail. Legitimate agents also can't cold-call you about Medicare Advantage or Part D plans without your prior permission. An unsolicited call asking for your Medicare, Social Security, or bank numbers is a scam. Hang up.

Turning 65 puts you on every marketing list in America, and unfortunately some of the people dialing those lists are criminals. Per the FTC and Senate Aging Committee reporting, Medicare-related fraud costs older Americans enormous sums every year, and enrollment season is peak hunting season. The red flags:

• Anyone who called you first asking for your Medicare number, Social Security number, or banking details.
• "Your benefits will be canceled unless you act today." Medicare doesn't work that way; urgency is the scammer's favorite tool.
• "We need to send you a new card" — especially any mention of a fee. Real card replacements are free and initiated by you.
• Free gifts, free genetic tests, or free medical equipment in exchange for your Medicare number — that number is what's being stolen.
• Door-knockers. Agents may not show up uninvited to sell Medicare plans. (For the record: we visit clients in person only in Boise County, and only by appointment they've asked for.)

Protect yourself with three habits: guard your Medicare number like a credit card; let unknown callers go to voicemail during enrollment season; and when in doubt, hang up and call a number you looked up — 1-800-MEDICARE, SHIBA, or your own agent. If you think you've been targeted, report it at 1-800-MEDICARE or via the FTC at reportfraud.ftc.gov. And please don't be embarrassed if you got caught out — these operations are professional, and reporting them protects your neighbors.

The printable final checklist

Here's the whole article compressed into one table. Print it, stick it on the fridge, and enjoy the deeply underrated pleasure of crossing things off.

And because forewarned is forearmed, here's what tends to catch first-year Medicare folks off guard — an illustrative look at the surprises we hear about most across the kitchen table (not a scientific survey, just twenty years of listening):

Every one of those surprises is preventable with the checklist above. That's the entire thesis of this article, and honestly, of our agency.

Frequently asked questions

Related reading

• Medicare Enrollment Periods, Explained (Without the Headache) — every window, every deadline, every penalty.
• Medicare Advantage vs. Medicare Supplement in Idaho — the big fork, compared across 6 areas.
• The Your Health Idaho ACA Guide — bridge coverage if you retire before 65.

CarrieAnne Kowalczyk

CarrieAnne founded Personal Touch Ins. & Benefits in 2005 and has spent two decades comparing Medicare, health, and life insurance options for Idaho families. She serves as NABIP's Treasure Valley Legislative Chair, is a member of the NABIP Leading Producers Roundtable, and holds AHIP, CMIP, and HAFA credentials. Her signature approach: break every decision into 6 comparison areas, then let you decide — no pressure, ever. More about CarrieAnne and the team →

This article is general education, not personalized advice — enrollment and tax rules have exceptions that depend on your situation (the HSA timing in particular is worth confirming with your tax professional). Dollar figures are for the 2026 plan year, per CMS. Free counseling is also available from SHIBA, Idaho's State Health Insurance Benefits Advisors program, through the Idaho Department of Insurance.

We do not offer every plan available in your area. Currently we represent 5 organizations which offer 300 products in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Program (SHIP) to get information on all of your options.