Medicare 2026

Miss a Medicare Deadline? Here's What It Costs for Life

NEW YORK CITY — For most New Yorkers turning 65, the calendar matters as much as the coverage. Missing a Medicare enrollment window for Part B or Part D can trigger a penalty that follows you every month — often for the rest of your life. The good news: once you know which dates apply to you, the penalties are almost entirely avoidable.

This guide focuses on the timing side of late enrollment — the windows that open, when they close, and what happens if you slip past one.

The window that starts it all: your Initial Enrollment Period

Your Initial Enrollment Period (IEP) is a seven-month stretch built around your 65th birthday. It begins three months before the month you turn 65, includes your birthday month, and runs for three months after. If you sign up for Part A, Part B and Part D during this window, no late penalty applies.

Miss it without another form of qualifying coverage, and the penalty clock has already started.

What happens if you miss Part B

If you don't enroll in Part B when first eligible — and you don't qualify for a Special Enrollment Period — you'll usually have to wait for the General Enrollment Period, which runs January 1 through March 31 each year. Coverage then starts the month after you enroll.

The Part B late-enrollment penalty adds 10% to your standard premium for each full 12-month period you could have had Part B but didn't. In most cases, you pay that higher premium for as long as you have Part B. That's why the penalty is often described as "for life."

What happens if you miss Part D

Part D works differently but the logic is similar. If you go 63 days or more in a row without Part D or other "creditable" prescription drug coverage after your IEP ends, a late-enrollment penalty can be added when you finally sign up.

The penalty is calculated as roughly 1% of the "national base beneficiary premium" for every month you were without creditable coverage, rounded to the nearest 10 cents and added to your monthly Part D premium. Like the Part B penalty, it generally stays with you as long as you're enrolled.

You can only sign up for or change Part D during specific windows — the Annual Enrollment Period from October 15 through December 7, or a Special Enrollment Period if you qualify.

Special Enrollment Periods: the main escape hatch

Many people delay Part B or Part D on purpose — and legally — because they have coverage through a current job. If you or your spouse are still actively working and covered by an employer group health plan, you generally get a Special Enrollment Period to sign up for Part B without penalty. That window lasts up to eight months after the job or the group coverage ends, whichever comes first.

For Part D, having "creditable" drug coverage (coverage the plan sponsor certifies is at least as good as standard Medicare Part D) protects you from the penalty. Keep the annual creditable-coverage notice your employer or union sends you; you may need it later.

COBRA and retiree coverage are not treated the same as active employer coverage for Part B timing. Relying on them past your IEP is one of the most common ways people accidentally trigger a penalty.

How the dates interact

Here's the piece that trips people up: the enrollment windows don't all line up.

• Initial Enrollment Period: the 7 months around your 65th birthday (Parts A, B, D).
• General Enrollment Period: January 1 – March 31 (Part B, if you missed your IEP).
• Medicare Annual Enrollment Period: October 15 – December 7 (Part D and Medicare Advantage changes).
• Medicare Advantage Open Enrollment Period: January 1 – March 31 (for people already in a Medicare Advantage plan).
• Special Enrollment Periods: triggered by life events such as losing job-based coverage or moving.

If you miss your IEP, you might have to wait months for the next available window — and be uninsured or underinsured in the meantime, while the penalty continues to accrue.

New York City is in New York County, where Medicare beneficiaries choose among stand-alone Part D and Medicare Advantage options from multiple carriers. For 2027, the county has 59 Medicare Advantage plans from 15 carriers, with 6 new plans, 20 not returning, 2 renamed, and 11 continuing plans changing something in their terms (see each plan's ANOC). Availability is set at the county level, not the city level, so the same menu of plans is generally available across the borough during each enrollment window.

A quick word on 2027 numbers

Even without a penalty, Part D has real cost limits worth knowing about for 2026: a maximum deductible of $615 and a new annual out-of-pocket cap of $2,100. The coverage gap (the old "donut hole") has been eliminated as of 2025, leaving three coverage phases. Higher-income enrollees — generally those with income above $109,000 for a single filer in 2026 — pay IRMAA surcharges on top of standard premiums. The optional Medicare Prescription Payment Plan lets you spread drug costs across the year in monthly installments.

None of these change the penalty rules, but they're worth factoring in when you weigh whether to enroll on time.

Where to get personal help

Penalty questions almost always come down to your specific dates and your specific prior coverage. For personalized answers, call 1-800-MEDICARE (1-800-633-4227), visit medicare.gov, or contact New York's State Health Insurance Assistance Program (SHIP), known locally as HIICAP, for free one-on-one counseling.