Medicare Supplement

Medicare and Employer Coverage Deadlines in Warren

If you're approaching 65 in Warren and still clocking in, you don't automatically have to drop your employer health plan and jump onto Medicare. But you do have decisions to make — and a few deadlines that, if missed, can cost you for the rest of your life.

Warren, Mich. — Turning 65 on the job? Here's how Medicare fits in

The rules aren't complicated once you see them laid out. Here's a plain-language walk-through of how Medicare coordinates with employer coverage, and the mistakes to sidestep.

First question: How big is your employer?

The size of the company you (or your spouse) work for changes everything about how Medicare interacts with your job coverage.

• 20 or more employees: Your employer plan usually pays first, and Medicare pays second. Many people in this situation delay Part B without penalty because they have "creditable" coverage through work.
• Fewer than 20 employees: Medicare typically pays first, and your employer plan pays second. In this case, you usually need to enroll in Parts A and B at 65, or your employer plan may not cover much.

Ask your HR or benefits office — in writing — which category you fall into and whether your coverage is considered creditable. That single conversation prevents most of the expensive mistakes.

Part A is usually a safe "yes" at 65

Most people qualify for premium-free Part A (hospital insurance) because they or a spouse paid Medicare taxes for at least 10 years. Since it doesn't cost anything out of pocket, many workers enroll in Part A at 65 even while keeping their employer plan.

One important exception: if you contribute to a Health Savings Account (HSA), you cannot keep adding to it once you enroll in any part of Medicare, including Part A. If your HSA matters to you, talk with your benefits team before signing up.

Part B: The decision that trips people up

Part B (doctors and outpatient care) has a monthly premium, so this is where the "delay or enroll" question really lives.

• If your employer coverage is creditable and the company has 20+ employees, you can generally delay Part B without a late penalty.
• When your job or that coverage ends, you get an 8-month Special Enrollment Period to sign up for Part B without penalty.
• If you miss that window, you may face a lifetime late-enrollment penalty — 10% added to your Part B premium for each 12-month period you could have had it but didn't.

COBRA and retiree coverage do not count as active employer coverage for this purpose. That surprises a lot of people. Once you leave the job, the clock starts, even if COBRA is still paying claims.

Part D and prescriptions in 2026

If your employer plan includes drug coverage that Medicare considers creditable, you can delay Part D without penalty. Your plan is required to send you a notice each year telling you whether it's creditable — hang on to that letter.

A few 2026 program facts worth knowing:

• Part D has a new $2,100 annual out-of-pocket cap on covered drugs.
• The maximum Part D deductible is $615.
• The old "donut hole" coverage gap is gone as of 2025 — Part D now has three phases instead of four.
• The Medicare Prescription Payment Plan lets you spread your drug costs across the calendar year in monthly installments instead of paying big bills at the pharmacy counter.

Higher earners: Watch for IRMAA

If your income is above certain thresholds, you'll pay an income-related surcharge (IRMAA) on top of your Part B and Part D premiums. For 2026, IRMAA begins above $109,000 for a single filer (higher for married couples filing jointly). Social Security uses your tax return from two years earlier to figure this out, so a big work income at 63 can affect your Medicare premium at 65.

If you retire or your income drops, you can ask Social Security to reconsider using a life-changing event form.

What's available around Warren

Warren is in Macomb County, which is where Medicare sets plan availability for your area. If and when you decide to look at Medicare Advantage or standalone Part D plans, the specific plans, carriers, and counts are all determined at the county level — not the city level. The official plan finder at Medicare.gov will show you exactly what's offered in Macomb County based on your ZIP code and your prescriptions.

Key dates to remember

• Initial Enrollment Period: The 7-month window around your 65th birthday (3 months before, your birth month, and 3 months after).
• Special Enrollment Period: Up to 8 months after employer coverage ends, to sign up for Part B without penalty.
• Annual Enrollment Period: October 15 – December 7 each year, to join, switch, or drop Medicare Advantage or Part D plans.
• Medicare Advantage Open Enrollment: January 1 – March 31, if you're already in a Medicare Advantage plan and want to change.