Medicare 2026

How Employer Size Shapes Medicare Choices in Miles City

Turning 65 while still on the job is more common than it used to be — and in Miles City, plenty of workers are weighing whether to sign up for Medicare, stick with their employer plan, or do both. The right answer depends on the size of your employer, what your current coverage looks like, and a few deadlines you don't want to miss.

Here's how Medicare is designed to work alongside job-based insurance, and where Miles City residents can get straight answers.

Medicare basics when you're still working

Medicare has four parts. Part A covers hospital stays, Part B covers doctor visits and outpatient care, Part C (Medicare Advantage) is a private alternative to A and B, and Part D covers prescription drugs. You become eligible at 65, whether you're working or not.

Miles City is in Custer County, where residents have access to Original Medicare everywhere in the country, plus a selection of Medicare Advantage and Part D plans offered by private insurers at the county level.

Who pays first: it depends on employer size

This is the rule that trips people up most. Medicare uses your employer's size to decide which insurance is "primary" (pays first) and which is "secondary" (pays what's left).

• 20 or more employees: Your employer plan is usually primary. Medicare is secondary. Many people in this situation delay Part B to avoid paying a premium for coverage they may not need yet.
• Fewer than 20 employees: Medicare is usually primary. In this case, you generally need to enroll in Part A and Part B at 65, because your employer plan may only pay after Medicare does. Skipping Part B could leave you with big bills.

If you work for a small employer in Miles City — and many local businesses are small — this rule matters. Ask your HR or benefits contact in writing how the plan coordinates with Medicare.

Should you take Part A at 65?

For most people, yes. Part A is premium-free if you or your spouse paid Medicare taxes for at least 10 years (40 quarters). Signing up doesn't cancel your employer coverage, and it can help pay hospital costs your job-based plan doesn't cover.

One big exception: if you contribute to a Health Savings Account (HSA), you must stop HSA contributions once Medicare begins — including Part A. Enrolling in Part A can also be backdated up to six months, so plan the timing carefully with your benefits office.

Delaying Part B without a penalty

If you have "creditable" employer coverage through active employment (yours or a spouse's), you can delay Part B and avoid the lifetime late-enrollment penalty. When that employment or coverage ends, you get an 8-month Special Enrollment Period to sign up for Part B.

Important: COBRA and retiree coverage do not count as active employer coverage for this purpose. If you retire and go on COBRA, your 8-month window still starts when the job ended — not when COBRA runs out. Miles many people learn this the hard way.

What about prescription drugs?

If your employer plan includes drug coverage that Medicare considers "creditable" (at least as good as Part D on average), you can delay Part D without penalty. Your plan should send you a notice each year telling you whether it's creditable. Keep those notices.

A few Part D figures worth knowing for 2027:

• The out-of-pocket cap for covered drugs is $2,400.
• The maximum Part D deductible is $700.
• The old "donut hole" coverage gap is gone; Part D now has three simpler phases.
• The Medicare Prescription Payment Plan lets you spread your drug costs across the year in monthly amounts if you choose.

Higher earners: watch for IRMAA

If your income is above $109,000 (single filer, 2026) or the equivalent for joint filers, you'll pay an income-related monthly adjustment amount (IRMAA) on top of your Part B and Part D premiums. Because IRMAA looks back two years at your tax return, still-working professionals in Miles City sometimes get surprised by it. If your income has dropped due to retirement or a life change, you can appeal.

Key dates to remember

• Initial Enrollment Period: the 7 months around your 65th birthday.
• Special Enrollment Period: 8 months after employer coverage ends.
• Annual Enrollment Period: October 15 – December 7 each year.
• Medicare Advantage Open Enrollment: January 1 – March 31.