I picked up a passenger last spring — retired teacher, 68 years old, moving to Henderson from California. About ten minutes into the ride she mentioned she was still figuring out her Medicare. I asked her what the holdup was. She said she’d been on COBRA since leaving her job two years earlier, figured she had more time, and was just now looking into Part B.
I didn’t say anything right away. I just did the math in my head. Two years on COBRA after leaving work. Initial Enrollment Period missed. No Special Enrollment Period because COBRA doesn’t count. That’s a 20% permanent penalty on her Part B premium — every month, for as long as she has Medicare. She had no idea.
That conversation stuck with me. Because she’s not an unusual case in Las Vegas. I’ve heard versions of it more times than I can count. The Medicare Part B enrollment rules aren’t complicated, but they’re easy to get wrong — and the consequences don’t go away. Here’s what you actually need to know before you make that same mistake.
What Medicare Part B Is — and Why the Timing Matters So Much
Medicare Part A covers hospital stays. Part B covers outpatient care — doctor visits, lab work, preventive screenings, durable medical equipment. Most people get Part A for free (if they’ve paid into Social Security for 10 years or more). Part B costs money: the standard monthly premium in 2026 is $202.90, with an annual deductible of $283.
You can decline Part B when you first become eligible. Sometimes that makes sense — if you’re still working and covered by a qualifying employer plan, delaying costs you nothing. But if you delay without a qualifying reason, you pay a penalty that never goes away.
The penalty is 10% added to your monthly premium for every full 12-month period you could have had Part B but didn’t sign up. Wait two years: 20% more, permanently. Wait five years: 50% more, permanently. There’s no cap, no forgiveness period, no way to pay it off. It follows you for the rest of your life.
At $202.90 per month in 2026, a 20% penalty adds about $40 a month — $480 a year — on top of what you’d already be paying. For a healthy 68-year-old who expects to live another 20 years, that’s nearly $10,000 in unnecessary penalties. For something that was completely avoidable.
The Three Enrollment Windows — and What Each One Means for You
There are three times you can sign up for Medicare Part B. Understanding which window applies to your situation is the whole game.
Initial Enrollment Period (IEP) is your first chance. It opens three months before the month you turn 65, includes your birthday month, and closes three months after — a total of seven months. This is your penalty-free window if you’re not covered by a qualifying employer plan. Miss it without a valid reason, and you’re in penalty territory.
If you sign up during the first three months of your IEP (before your birthday month), coverage starts the first day of your birthday month. Sign up during or after your birthday month, and coverage is delayed — sometimes by up to three months. So earlier in that seven-month window is better.
Special Enrollment Period (SEP) is for people who delayed Part B because they were covered by a current employer’s group health plan. When that coverage ends — because you leave the job, retire, or lose eligibility — you get an eight-month window to sign up for Part B without any penalty.
This is the legitimate way to delay Part B past 65. The key word is “current” employer. You must be actively employed, or covered as a dependent on an actively employed spouse’s plan. The employer must have 20 or more employees. And the coverage has to be from current work — not from a previous job, not retirement benefits, not COBRA.
General Enrollment Period (GEP) is the fallback for people who missed both windows. It runs from January 1 through March 31 each year. Coverage starts July 1. You’ll pay the late enrollment penalty if you weren’t eligible for an SEP. The GEP exists so people can eventually get covered — but it’s not a good situation to be in.
The COBRA Mistake — The Most Expensive Misunderstanding in Medicare
Here’s the thing that trips people up more than anything else: COBRA is not creditable coverage for Medicare purposes.
When you leave a job and your employer coverage ends, you’re often offered COBRA — the option to continue that same insurance for up to 18 months by paying the full premium yourself. It can cost $500 to $700 a month or more, but it keeps your existing doctors and network, and a lot of people choose it as a bridge.
The problem: COBRA does not extend your Special Enrollment Period. The moment your employer coverage ends, your eight-month SEP clock starts. COBRA doesn’t pause it. COBRA doesn’t reset it. Taking COBRA doesn’t give you more time to sign up for Part B without penalty.
So what actually happens to many Las Vegas retirees: they leave a job at 65 or 66, go on COBRA for 18 months because they’re not ready to deal with Medicare yet, and then finally look at Part B at 67. By then, the SEP window closed 10 months ago. They’ve missed it. And the penalty calculation is based on how long they were uninsured for Medicare purposes — which, in this scenario, can easily be two or more 12-month periods.
The fix is simple: when your employer coverage ends, call Social Security within eight months. Don’t wait. Don’t assume COBRA buys you time. It doesn’t.
The same applies to retiree health coverage — insurance your former employer provides after you stop working. It’s not the same as active employer coverage. Check with your HR department before assuming you’re protected.
How to Actually Enroll — Your Options in Las Vegas
Once you know your window, signing up is straightforward. You have three options:
Online at SSA.gov is the fastest. The application takes about 10 minutes if you have your Social Security number, Medicare number (if you already have Part A), and basic employment information ready. You’ll get a confirmation number immediately.
By phone at 1-800-772-1213 (TTY: 711). Social Security representatives can process your Part B application over the phone. Hours are Monday through Friday, 8 a.m. to 7 p.m. Call volumes are highest early in the week — Wednesday afternoon tends to be lighter.
In person at a Las Vegas Social Security office. There are two convenient locations: the Downtown Las Vegas office at 600 S. Las Vegas Blvd (89101) and the Henderson office at 120 Market St (89015). Appointments are recommended — walk-ins are accepted but wait times can be long. Schedule at SSA.gov or by calling the main number above.
If you’re not sure which situation applies to you — especially if you have or had employer coverage and aren’t certain whether COBRA counts — use Nevada’s free SHIP counseling service. Nevada SHIP provides one-on-one Medicare guidance at no cost from trained volunteers who don’t sell insurance. Reach them at 1-800-307-4444.
What to Do If You’ve Already Missed Your Window
If you’re reading this and you’ve already missed your IEP and your SEP window has passed, the most important thing is to not wait any longer. Enroll in the next General Enrollment Period (January 1 – March 31) to stop the penalty from growing.
Some people qualify for an exception they don’t know about. If you were enrolled in a Medicare Advantage plan that left your area, or if you moved out of your plan’s service area, or if you qualify for a low-income subsidy program, you may have additional enrollment options. Again, Nevada SHIP can walk you through this at no charge.
One more thing worth knowing: if your income is above certain thresholds, you’ll pay more than the standard $202.90 premium through a surcharge called IRMAA (Income-Related Monthly Adjustment Amount). The 2026 IRMAA thresholds start at $106,000 for individuals and $212,000 for couples. If that applies to you, the penalty compounds against a higher base premium — another reason to enroll on time.
Frequently Asked Questions
Can I delay Medicare Part B if I’m still working at 65?
Yes — if you’re covered by a current employer’s group health plan (or your spouse’s), and the employer has 20 or more employees. In that case, you can delay Part B without penalty and use your Special Enrollment Period when the employer coverage ends. You have eight months from that date to enroll without a penalty. Confirm with your HR department that your coverage qualifies before making this decision.
Does COBRA count as creditable coverage for Medicare Part B?
No. COBRA continues your former employer’s insurance temporarily, but it does not count as active employer coverage for Medicare SEP purposes. The moment your employer coverage ends, your eight-month Special Enrollment Period clock begins — COBRA does not pause or extend it. Many people make this mistake. Don’t be one of them.
What is the Medicare Part B late enrollment penalty in 2026?
The penalty is 10% added to your monthly Part B premium for each full 12-month period you could have enrolled but didn’t. With the 2026 standard premium at $202.90, a two-year delay adds about $40/month permanently ($480/year). A five-year delay adds about $101/month permanently — over $1,200/year. The penalty never goes away.
Where can I enroll in Medicare Part B in Las Vegas?
You can apply online at SSA.gov, call Social Security at 1-800-772-1213, or visit the Social Security office at 600 S. Las Vegas Blvd (Downtown Las Vegas) or 120 Market St (Henderson). For free, unbiased help, call Nevada SHIP at 1-800-307-4444.
What happens if I enroll during the General Enrollment Period?
You can enroll during GEP (January 1 – March 31) if you missed your IEP and don’t qualify for an SEP. Coverage starts July 1 of that year. You will pay the late enrollment penalty based on how many 12-month periods you went without Part B coverage. GEP enrollment stops the penalty from growing further — but it doesn’t erase what’s already accumulated.
References
- Medicare.gov — Avoid Late Enrollment Penalties
- Medicare.gov — Working Past 65
- Medicare Interactive — Part B Late Enrollment Penalties
- KFF — Medicare Part B Penalty: Is There Any Way to Avoid It?
- CMS — 2026 Medicare Costs Fact Sheet
Disclaimer: This article is for informational purposes only and does not constitute personalized insurance, medical, legal, or financial advice. Medicare rules and premiums change annually. Verify your specific enrollment situation at Medicare.gov, by calling 1-800-MEDICARE, or through a licensed Medicare counselor. Nevada SHIP provides free, unbiased Medicare counseling at 1-800-307-4444.