Medicare 2026

Miss Part B or Part D? Penalties Can Last for Life

CHARLOTTE, N.C. — For most people turning 65, Medicare enrollment is a matter of hitting a few key dates on the calendar. Miss those dates, and the cost can follow you for the rest of your life. That is the piece of Medicare that trips up the most Charlotte retirees: the timing.

Part B and Part D each have their own enrollment windows, their own penalties, and their own rules for what counts as a good reason to sign up later. Knowing how those dates line up — and what happens if one slips past you — is the single best way to avoid a permanent monthly surcharge.

The one window everyone should know: your IEP

Your Initial Enrollment Period, or IEP, is seven months long. It starts three months before the month you turn 65, includes your birthday month, and ends three months after. This is the cleanest, cheapest time to sign up for Part A, Part B, and Part D.

If you enroll in the three months before your birthday, coverage generally starts the first day of your birthday month. If you wait until your birthday month or later inside the window, coverage begins the month after you sign up. Waiting past the IEP without other creditable coverage is where penalty risk begins.

What happens if you miss Part B

The Part B late enrollment penalty is 10% of the standard Part B premium for each full 12-month period you could have had Part B but did not. That surcharge is added to your monthly premium and, in most cases, stays there for as long as you keep Part B.

If you miss your IEP and do not qualify for a Special Enrollment Period, you generally have to wait for the General Enrollment Period, which runs January 1 through March 31 each year. Coverage now starts the month after you enroll — but the penalty still applies.

What happens if you miss Part D

Part D has a separate penalty. It is 1% of the "national base beneficiary premium" for every month you were eligible for Part D but went without creditable drug coverage for 63 days or more in a row. That amount is added to your Part D premium every month for as long as you have Part D.

Creditable coverage means drug coverage that Medicare considers at least as good as basic Part D — often from an employer, union, or the VA. If you have it, keep the notice the plan sends you each fall. That notice is your proof.

How the dates interact

This is where people get confused. The main Medicare enrollment periods do different things:

• Initial Enrollment Period (IEP): Your personal 7-month window around age 65. Covers Part A, Part B, and Part D.
• General Enrollment Period (GEP): January 1 – March 31, for people who missed their IEP for Part B.
• Annual Enrollment Period (AEP): October 15 – December 7, for changing Part D or Medicare Advantage plans for the following year.
• Medicare Advantage Open Enrollment: January 1 – March 31, a one-time switch out of a Medicare Advantage plan.
• Special Enrollment Period (SEP): Triggered by life events like losing job-based coverage.

The trap: AEP is not a fix for a missed Part B enrollment. You cannot use the fall window to solve a spring problem. And enrolling in a Medicare Advantage or Part D plan during AEP does not erase penalties already earned.

Still working past 65? Read this carefully

Many Charlotte-area workers stay on the job past 65 with employer coverage. If that employer plan is considered creditable, you can generally delay Part B and Part D without a penalty. When the job or the coverage ends, an 8-month Special Enrollment Period opens for Part B, and a 63-day window opens for Part D.

Two cautions. First, COBRA and retiree coverage usually do not count as active employer coverage for delaying Part B — that catches people every year. Second, if your employer has fewer than 20 employees, Medicare typically becomes your primary payer at 65, so delaying Part B can leave you with gaps.

When in doubt, ask the employer's benefits office in writing whether the coverage is creditable.

A quick word on local plan choices

Charlotte is in Mecklenburg County, where a range of Medicare Advantage and stand-alone Part D plans are offered each year. Plan availability is set at the county level, not the city level, so two neighbors in different counties can see different options. Whatever plan you eventually pick, the penalty rules above apply the same way — they are federal, not local.