Missed Your Medicare Window? The 2026 General Enrollment Period & Late Penalties (Houston)

Maybe the birthday came and went during a hard stretch — a move from Pasadena to a smaller place in Spring, a spouse’s hospital stay at Memorial Hermann, a job you held onto a few years past 65 because the bills didn’t stop. Maybe the packet from Medicare sat unopened on the counter next to the H-E-B receipts, or you assumed your retiree coverage would roll into Medicare automatically. Then one day you tried to enroll, and the clerk at the Social Security office on Gulf Freeway or the one over in Bellaire told you the next sign-up window doesn’t open until January — and that you may owe a penalty that follows you for the rest of your life. If that is where you are right now, take a breath. You are not the only Houstonian in this position, and you have a path forward.

Here is the direct answer. The Medicare General Enrollment Period (GEP) runs January 1 through March 31 every year. It exists for people who did not sign up for Medicare Part B (and sometimes premium Part A) when they were first eligible and who do not qualify for a Special Enrollment Period. If you enroll during the GEP, thanks to a rule change that took effect in 2023, your coverage now begins the first day of the month after you sign up — not the following July, as it did for decades. The catch is the penalty. If you went without Part B when you could have had it, Medicare can add a late-enrollment penalty of 10% of the standard Part B premium for each full 12-month period you delayed — and that surcharge generally lasts for as long as you have Part B. There is a separate, similar penalty for Part D prescription drug coverage. This guide explains exactly how those penalties work in 2026 dollars, who is exempt, and how Wise Insurance Agency helps Harris County residents limit the damage and, in some cases, get a penalty waived.

We do this with Houston families at the kitchen table every week. The number on the page often looks scarier than the situation actually is once you map out your enrollment history. Let’s walk through it.

The Initial Enrollment Period — and why so many Houstonians miss it

Your Initial Enrollment Period (IEP) is the first window Medicare gives you. It is a seven-month stretch built around the month you turn 65: the three months before your birthday month, the birthday month itself, and the three months after. If you are already receiving Social Security or Railroad Retirement benefits when you turn 65, you are usually enrolled in Part A and Part B automatically. But if you are not collecting Social Security yet — and a growing number of Houstonians work past 65 and delay claiming — nobody signs you up. You have to act inside that seven-month window yourself.

That is exactly where the trouble starts. After decades of helping Harris County residents, our team sees the same handful of reasons people miss the IEP:

• They were still working and assumed they didn’t need Medicare yet. Sometimes that assumption is correct — large-employer coverage can let you delay penalty-free. Sometimes it is not, especially with small employers or retiree/COBRA coverage.
• They confused Part A with full coverage. Many people enroll in premium-free Part A at 65 (it has no premium for most) but skip Part B because Part B has a monthly premium. Part B is the part that pays for doctors, outpatient care, and most of what you actually use.
• Life got in the way. A caregiving crisis, a move, a death in the family, a language barrier — the packet never got opened.
• They got bad information. A well-meaning HR department, a neighbor, or an outdated website told them something that wasn’t true for their situation.

When the IEP closes and you don’t have a qualifying reason to enroll later (a Special Enrollment Period — more on that below), the General Enrollment Period becomes your fallback. Our Medicare Eligibility page lays out who qualifies and when, and our broader Medicare overview explains how the parts fit together. The important thing to understand now is that the IEP is the only window that comes with no penalty attached, by default. Miss it without an exemption, and the clock on a potential penalty starts ticking.

The General Enrollment Period (Jan 1 – Mar 31) and the new coverage-start rule

The General Enrollment Period is Medicare’s annual catch-up window. It runs from January 1 to March 31 every year and is meant for people who:

• Did not sign up for Part B (or premium Part A) during their Initial Enrollment Period, and
• Do not qualify for a Special Enrollment Period that would let them enroll outside the GEP without penalty.

For many years, the GEP came with a painful quirk: no matter whether you signed up on January 2 or March 30, your coverage didn’t start until July 1 of that year. That meant a Houston retiree who enrolled in January could face a five- or six-month gap before Medicare actually paid a single doctor’s bill — a gap during which a hospital stay could be financially devastating.

That changed. Under the Consolidated Appropriations Act, 2021 (which carried the BENES Act enrollment-simplification provisions), effective January 1, 2023, GEP coverage now begins on the first day of the month after you enroll. Sign up in January, coverage starts February 1. Sign up in March, coverage starts April 1. The Kaiser Family Foundation breaks down this and the related enrollment changes in its analysis of the final rule on Medicare enrollment and eligibility.

One more point that confuses people: the GEP is for Original Medicare Part A and Part B. It is not the same as the Annual Enrollment Period in the fall (October 15 – December 7), which is for choosing or switching Medicare Advantage and Part D plans. Once you use the GEP to get into Part B, a related window lets you then pick up a Medicare Advantage plan or a stand-alone Part D plan, and you can layer on a Medicare Supplement (Medigap) policy. Sorting out that sequence is one of the things we map out for clients so nothing falls through the cracks.

The Part B late-enrollment penalty, in 2026 dollars

This is the penalty that does the most long-term financial damage, because it never goes away while you have Part B. Here is how it works, stated precisely.

The Part B late-enrollment penalty is 10% of the standard Part B premium for each full 12-month period that you could have had Part B but did not enroll. The percentage stacks: two full years of delay is 20%, three full years is 30%, and so on. Per Medicare.gov, this surcharge is added to your monthly premium and generally lasts for as long as you keep Part B.

The 2026 standard Part B premium, announced by CMS, is $202.90 per month. So each full year of delay adds 10% of $202.90 = about $20.29 per month to your premium. Note an important detail: the penalty is calculated against the current standard premium, so as the standard premium rises over time, your penalty dollar amount rises with it.

Read those numbers carefully, because the structure matters more than any single figure. The penalty counts only full 12-month periods. If you delayed Part B by 18 months, you are penalized for one full year (10%), not one and a half. If you delayed by 11 months, there is no full 12-month period, so there is no penalty at all. That detail alone has saved many of our Houston clients real money once we sat down and counted the months precisely from their records.

Because the penalty lasts as long as you have Part B, the lifetime cost compounds quietly. A three-year delay adds about $60.87 a month in 2026 — roughly $730 a year — and a Houston retiree who lives 20 more years on Medicare could pay well over $14,000 in penalties over a lifetime, before accounting for the fact that the dollar figure climbs as the standard premium rises. That is why we treat a missed Part B window as something to address quickly and carefully, not something to shrug off.

The Part D late-enrollment penalty, explained

Part D — prescription drug coverage — has its own, separate late-enrollment penalty, and it works on a different math. You can owe a Part D penalty even if you have no Part B penalty, and vice versa.

The Part D late-enrollment penalty is 1% of the “national base beneficiary premium” for each full month that you went without Part D or other creditable prescription drug coverage after your Initial Enrollment Period ended — as long as that gap lasted 63 days or more in a row. “Creditable” coverage means drug coverage expected to pay, on average, at least as much as standard Medicare Part D; many employer and union plans qualify, and your plan is required to tell you each year whether yours is creditable.

The national base beneficiary premium for 2026 is $38.99, per CMS. So each uncovered month adds 1% of $38.99 = about $0.39 per month to your eventual Part D premium. Medicare rounds the total to the nearest 10 cents. Like the Part B penalty, the Part D penalty generally lasts for as long as you have Part D coverage, and it is recalculated each year against the then-current base premium. Medicare.gov details the calculation on its Part D late-enrollment penalty page.

*Calculated as 1% × number of uncovered months × the $38.99 (2026) national base beneficiary premium, rounded to the nearest $0.10. The base premium changes annually, so the dollar figure is recalculated each year.

Who is exempt — SEPs, employer coverage, Medicaid and MSPs

Here is the relief most people don’t realize they may qualify for: not everyone who delayed Medicare owes a penalty. A large share of the “I missed my window” cases we see in Houston turn out to be exempt once we examine the details. The main exemptions:

1. You had creditable coverage through active employment (a Special Enrollment Period)

If you (or your spouse) were still working and you were covered by a group health plan based on that current employment at a large employer (generally 20 or more employees), you were allowed to delay Part B penalty-free. When that coverage ends, you get a Special Enrollment Period (SEP) — generally up to 8 months after the coverage or the employment ends — to enroll in Part B with no late penalty at all. This is the single most important exemption, and it is why working past 65 in Houston’s energy, medical, and education sectors does not automatically doom you to a penalty.

2. You qualify for Medicaid or a Medicare Savings Program

If your income and resources are limited, a Medicare Savings Program (MSP) administered through Texas can pay your Part B premium — and enrolling in certain MSPs comes with an SEP to sign up for Part B without the late penalty. Likewise, people who qualify for Extra Help (the Part D Low-Income Subsidy) generally do not pay a Part D late-enrollment penalty. KFF maintains a clear explainer of these programs in its Medicare Savings Programs overview. We help Harris County residents check whether they qualify and apply.

3. Certain limited exceptions

There are narrower exceptions — for example, certain volunteers serving abroad, and people affected by federally declared emergencies or disasters in some circumstances. These are less common but worth checking if your situation is unusual.

The practical takeaway: before you accept any penalty, have someone count the months and check your coverage history against these exemptions. Our team does this as the first step with every Houston client who walks in worried about a penalty — at our North Houston office or our South Houston office.

How to limit or appeal a late-enrollment penalty

If a penalty does apply, you are not necessarily stuck with the full amount. There are several legitimate ways to limit it or challenge it.

1. Enroll as soon as you can. Because the Part B penalty counts full 12-month periods, every month you delay further risks crossing another 12-month threshold and adding another 10%. If the GEP is open (January 1 – March 31), enrolling now can stop the penalty from growing.
2. Count the months precisely. Penalties are sometimes calculated from incomplete records. If you had creditable coverage during part of the gap, those months should not count. Pulling together proof — pay stubs, plan letters, the annual “Notice of Creditable Coverage” your employer or plan sends — can shrink or eliminate the penalty.
3. Request “equitable relief.” If a federal employee or agency gave you misinformation that caused you to delay enrolling, you can ask the Social Security Administration for equitable relief, which can waive the penalty and adjust your enrollment date. Documentation of the bad advice is key.
4. Appeal the Part D penalty through a reconsideration. If you believe a Part D penalty is wrong — for instance, because you actually had creditable coverage — your plan will send a notice with instructions to request a review by an independent reviewer (the C2C Innovative Solutions / Independent Review Entity). Strict deadlines apply, so act fast.
5. Check for Extra Help or an MSP. As noted above, qualifying for the Part D Low-Income Subsidy eliminates the Part D penalty, and certain MSPs open a penalty-free Part B SEP.

A Houston worked example with real dollar figures

Let’s make this concrete with a composite example drawn from the kinds of situations we see across Harris County. Meet “Robert,” a 68-year-old retiree in Spring. Robert turned 65 in early 2023. He kept working part-time without employer health coverage and didn’t enroll in Part B or Part D, figuring he was healthy and would “deal with it later.” By the time he came to us in early 2026, he had gone roughly 3 full years without Part B and the same stretch — about 36 full months — without creditable drug coverage.

Here is what that looks like in 2026 dollars:

Robert’s penalties alone add up to roughly $74.87 per month — about $898 a year, on top of his regular premiums. And because both penalties last for life and are recalculated each year against rising base premiums, that figure will grow over time. Over a 20-year retirement, the lifetime cost of his delay runs into the tens of thousands of dollars.

But here is the part that surprises people. When we sat down and reconstructed Robert’s history, we found he had actually held a small-business job for about seven months during that gap — with creditable drug coverage attached. Those months reduced his Part D uncovered-month count, trimming the Part D penalty. We also confirmed his Part B math against his exact enrollment dates, making sure he wasn’t being charged for a partial year that didn’t reach a full 12 months. The lesson: the headline penalty is a starting point, not a verdict.

Your next step if you missed your window

If you missed your Initial Enrollment Period, the worst thing you can do is nothing. Penalties grow, coverage gaps leave you exposed to Houston hospital bills, and deadlines for appeals slip away. Here is the clear path forward:

• Don’t assume you owe a penalty. Many people who think they’re stuck actually qualify for a Special Enrollment Period or an exemption. The first step is always to count the months and check your coverage history.
• If the GEP window is open (January 1 – March 31), act before March 31. Enrolling stops the Part B penalty from growing and gets your coverage started the first of the next month.
• Gather your records. Old insurance cards, employer plan letters, the “Notice of Creditable Coverage” your plans mailed you, and any letters from Medicare or Social Security. These are the evidence that can shrink a penalty or support an appeal.
• Let Wise Insurance Agency do the math with you. We confirm your enrollment timeline, check every exemption, calculate any penalty in real dollars, and help you choose the right combination of Medicare plans — Original Medicare with a Medigap and Part D, or a Medicare Advantage plan — so the moment you’re enrolled, you’re actually protected.

A missed window is a common, fixable problem. The penalties are real, but so are the exemptions and the appeal routes — and the sooner you start, the more options you keep. That’s the help we provide to Houston and Harris County families every week.

Frequently asked questions

Wise Insurance Agency is a licensed insurance agency in the State of Texas. The information here is general guidance and not a substitute for plan-specific advice. We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact 1-800-MEDICARE or your local State Health Insurance Assistance Program (SHIP) to get information on all of your options. Enrollment periods, premiums, penalty amounts, and program rules change; figures cited reflect 2026 federal program data as published by CMS, Medicare.gov, and SSA as of the date this article was written. Verify current rules before making any election.