Medicare 2026

Part B and Part D timing rules for Wheeling Medicare

Medicare has a handful of enrollment windows that sound bureaucratic but carry real, sometimes permanent, financial consequences. Miss one, and you could pay a higher premium every month for as long as you have coverage. The good news: once you understand how the deadlines line up, they're straightforward to plan around. Here's a plain-English guide to the timing that matters most.

Your Initial Enrollment Period (IEP): the seven months around your 65th birthday

Most people become eligible for Medicare at 65. Your Initial Enrollment Period runs for seven months: the three months before your birthday month, your birthday month, and the three months after. During this window you can sign up for Part A (hospital) and Part B (medical), and you can also enroll in a Part D prescription drug plan or a Medicare Advantage plan.

Signing up in the three months before you turn 65 helps your coverage start the month you become eligible. If you wait until your birthday month or later, your coverage can be delayed.

If you're already receiving Social Security benefits before 65, you'll typically be enrolled in Parts A and B automatically. Everyone else needs to sign up actively through the Social Security Administration.

The Part B late enrollment penalty: the one that lasts forever

This is the deadline that trips people up the most. If you don't enroll in Part B when you're first eligible — and you don't qualify for a special exception (more on that below) — you may owe a late enrollment penalty of 10% of the standard Part B premium for each full 12-month period you could have had Part B but didn't. That penalty is added to your monthly premium for as long as you have Part B. In most cases, that means for the rest of your life.

The standard Part B premium in 2026 is $202.90 per month. A person who delayed Part B by three years, for example, could pay roughly 30% more every month, indefinitely.

When it's okay to delay Part B: credible employer coverage

If you (or your spouse) are still working at 65 and covered by an employer group health plan based on that current employment, you may be able to delay Part B without penalty. When that coverage ends, you get an eight-month Special Enrollment Period (SEP) to sign up for Part B without a penalty.

Two important cautions:

• COBRA and retiree coverage do NOT count as active employer coverage for this purpose. Many people learn this the hard way. If you retire and go on COBRA, your SEP clock is still ticking based on when your active employment ended.
• If your employer has fewer than 20 employees, Medicare generally becomes the primary payer at 65. Check with your benefits administrator before deciding to delay.

The Part D late enrollment penalty

Part D (prescription drug coverage) has its own penalty. If you go 63 or more days in a row without "creditable" drug coverage after your Initial Enrollment Period, you may owe a penalty when you eventually enroll. The amount is roughly 1% of the "national base beneficiary premium" for every month you went without coverage — and, like the Part B penalty, it's added to your premium for as long as you have Part D.

"Creditable coverage" means drug coverage that's expected to pay, on average, at least as much as standard Medicare Part D. Employer plans, VA benefits, and some other sources often qualify. Your plan should send you a notice each year telling you whether your coverage is creditable — keep those notices.

Worth noting: starting in 2025, Part D includes an annual out-of-pocket cap on covered prescription drugs. That cap is $2,100 in 2026 and $2,400 in 2027. Even people who take few medications today may want drug coverage in place to avoid the penalty and to have protection if their needs change.

The Medigap open enrollment window

If you're considering Original Medicare paired with a Medigap (Medicare Supplement) policy, timing matters here too. Your one-time, six-month Medigap Open Enrollment Period begins the month you're 65 or older AND enrolled in Part B. During this window, insurers generally can't deny you a Medigap policy or charge more based on your health.

After this window closes, in most states, insurers can use medical underwriting — which could mean higher prices or a denial. This is one reason the choice between Medicare Advantage and Original Medicare + Medigap deserves careful thought early.

Original Medicare + Medigap vs. Medicare Advantage: a neutral snapshot

Both paths have trade-offs, and neither is universally "better."

• Original Medicare + Medigap + a standalone Part D plan typically offers broad provider access nationwide and predictable out-of-pocket costs, but usually involves paying separate premiums for Medigap and Part D, and Medigap doesn't cover things like routine dental or vision.
• Medicare Advantage bundles Parts A, B, and usually D into one plan and often includes extra benefits, but generally uses provider networks and requires you to follow plan rules like prior authorization or referrals.

The right fit depends on your health, your providers, your prescriptions, your travel patterns, and your budget. It's a personal decision, not a ranking.

Ongoing windows to remember

• Annual Open Enrollment (Oct. 15 – Dec. 7): You can join, switch, or drop a Medicare Advantage or Part D plan for coverage starting Jan. 1.
• Medicare Advantage Open Enrollment (Jan. 1 – Mar. 31): If you're already in a Medicare Advantage plan, you can switch to another or return to Original Medicare (and add a Part D plan).
• General Enrollment Period (Jan. 1 – Mar. 31): For people who missed their Initial Enrollment Period and don't qualify for a Special Enrollment Period. Coverage begins the month after you enroll — but late penalties may still apply.

Where to get trustworthy help

Medicare decisions are personal, and the details matter. For unbiased, no-cost guidance:

• Visit Medicare.gov to compare plans in your area and read official rules.
• Call 1-800-MEDICARE (1-800-633-4227), available 24/7.
• Contact your State Health Insurance Assistance Program (SHIP) for free, one-on-one counseling from trained volunteers.

Understanding the deadlines is half the battle. The other half is knowing where to turn when you have questions — and asking them before, not after, a window closes.