Missing your Medicare Part B enrollment window is one of the costliest mistakes a new retiree can make — and unfortunately, it happens all the time. The penalty is permanent, it compounds every year you delay, and most people don’t find out until it’s too late to fix it.

If you’re approaching 65 in Oregon, this guide is essential reading.

What Is the Medicare Part B Late Enrollment Penalty?

Medicare Part B covers doctors, outpatient services, labs, and most non-hospital medical care. Unlike Part A (which is usually free), Part B requires a monthly premium — $185 per month in 2026 for most people.

If you don’t enroll during your Initial Enrollment Period (IEP) — the 7-month window surrounding your 65th birthday — and you don’t have qualifying coverage from an employer, you’ll face a late enrollment penalty of 10% added to your Part B premium for every 12-month period you were eligible but didn’t enroll.

Here’s the painful part: that penalty lasts for as long as you have Medicare. There’s no cap, no forgiveness after a few years — it follows you for life.

How Big Is the Penalty in Real Dollars?

Let’s do the math for an Oregon resident who delays 2 years past their IEP:

Standard 2026 Part B premium: $185/month
Penalty (2 years late = 20% added): $37/month extra
Your lifetime monthly premium: $222/month
Extra cost over 20 years of retirement: $8,880+

Delay 5 years and that number balloons further. For a couple, the numbers double.

When Is Your Initial Enrollment Period?

Your Initial Enrollment Period (IEP) is a 7-month window:

3 months before the month you turn 65
The month you turn 65
3 months after the month you turn 65

The earlier in that window you enroll, the sooner your coverage begins. If you enroll in the last 3 months of your IEP, coverage may be delayed by 1–3 months.

Common Oregon Situations That Cause Part B Penalties

Still Working Past 65 With Employer Coverage

If you’re still employed at 65 and covered by a group health plan through an employer with 20 or more employees, you can delay Part B without penalty — but you must enroll within 8 months of losing that employer coverage (a Special Enrollment Period, or SEP).

Important: COBRA coverage does NOT qualify as employer coverage for this purpose. Don’t delay enrollment thinking COBRA protects you.

Retired Before 65 With ACA Marketplace Coverage

Many Oregonians retire early and use Covered Oregon marketplace plans to bridge the gap. These plans do not give you a Special Enrollment Period. When you turn 65, you must enroll in Medicare during your IEP — even if your marketplace plan is still active.

If you keep a marketplace plan after becoming Medicare-eligible, you may also lose any premium tax credits you’re receiving.

TRICARE or VA Coverage

Veterans and TRICARE beneficiaries often assume their coverage is enough to skip Medicare. In some cases you can delay — but the rules are complex, and getting it wrong can cost you your TRICARE benefits. Always verify with a licensed Medicare broker before making this decision.

Special Enrollment Period: When Can You Enroll Late Without a Penalty?

A Special Enrollment Period (SEP) lets you enroll outside your IEP without a penalty if you meet specific criteria:

Actively employed with employer-sponsored coverage at a company with 20+ employees
Spouse’s employer coverage (same 20+ employee rule applies)
Certain other qualifying life events

You have 8 months from when that employer coverage ends to enroll. Missing that 8-month window triggers the penalty even if you had a valid SEP.

How to Enroll in Medicare Part B in Oregon

You can enroll in Medicare Part B through:

Social Security Administration: Online at ssa.gov, by phone at 1-800-772-1213, or at your local SSA office
If already receiving Social Security: You may be automatically enrolled — confirm this with SSA

Oregon tip: The Oregon Senior Health Insurance Benefits Assistance (SHIBA) program offers free, unbiased Medicare counseling if you want a second opinion — but they can’t compare and recommend specific plan carriers. That’s where a licensed broker like me comes in.

The Smart Next Step: Get a Free Medicare Review

Understanding Part B penalties is just the beginning. Once you’re enrolled, you still need to choose between:

Medicare Advantage (all-in-one plans from private carriers)
Medicare Supplement (Medigap) (covers the gaps in Original Medicare)
Part D (prescription drug coverage)

Each has major tradeoffs. Making the right choice at 65 can save you thousands over the next decade.

I’m Rodney Cummings, RSSA® — a licensed Medicare broker in Oregon. I compare plans from dozens of carriers, explain every option in plain English, and help you enroll in the right plan at no cost to you. Carriers pay brokers — you pay nothing extra.

Book your free 30-minute Medicare review →

Or call me directly: 503-832-8555

Medicare Part B Penalty Oregon: How to Avoid a Lifetime Surcharge